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    • 专利摘要:
    A microelectromechanical system (MEMS) drive device (10, 10A) comprising a driven wheel (20) having n teeth at its outer periphery, an actuating ring (30) located around the driven wheel, itself including n + x teeth around its inner periphery, wherein the n + x teeth of the actuating ring (30) will gradually mesh with sub-sets of n teeth of the driven wheel (20) and disengage from them; a drive actuation assembly (40, 40A), coupled to the actuation ring (30), for driving the actuating ring in a hysteresis-like motion to cause rotation of the driven wheel (20), in which, after a complete cycle of the hysteresis type movement, the succession of meshes and meshes between selective subassemblies of the n teeth of the driven wheel (20) with selective subsets of the n + x teeth of the actuating ring (30) rotates the driven wheel of x teeth corresponding to 360 ° · x / n.
    公开号:CH709512B1
    申请号:CH01135/15
    申请日:2013-12-27
    公开日:2018-09-14
    发明作者:Stotz Gerhard
    申请人:Timex Group Usa Inc；
    IPC主号:
    专利说明:

    Description
    BACKGROUND TECHNOLOGY
    The present invention generally relates to driving devices for driving needles, rings and other display indicators for small electronic devices (ie portable), and in particular, a micro systems drive device. -electromechanical devices (MEMS) for electronic device, and in a particularly desirable embodiment, for driving such needles, rings and / or other indicators of a timepiece, such as a device worn on the wrist. However, it will be understood from the present description that the invention is not limited to this.
    [0002] Microelectromechanical systems (MEMS) which are used as unidirectional and bidirectional drive units are known in the art. For example, a known MEMS drive unit is a bidirectional device that uses at least four individual MEMS actuator parts, which form two pairs of individual MEMS actuators that mesh with at least two individual zones of the driven wheel. . For each direction of rotation, the drive unit requires a pair of MEMS actuator parts, where one of the pairs drives the wheel while the other is out of contact with the wheel. The other pair of actuator parts is required to rotate the wheel in the opposite drive direction. Although driving the wheel in either direction, the actuator portions of the other pair (i.e. for the other direction) must also be out of engagement with the wheel. Each of the four individual actuator parts is an electrostatic activation zone, where one zone of a pair of MEMS actuators is intended to produce a tangential drive force or a torque to drive the wheel and the other zone. The pair is intended to produce a radial force to pull the drive unit out of engagement with the wheel. A device of the above type therefore requires four (4) electrostatic parts.
    [0003] Another wheel drive actuator design is described in Patent No. 7,592,737. In this design, a MEMS device is provided, which includes a driven member having a series of teeth. The MEMS device includes a drive member operable to engage the driven member when the drive member is in a position engaged with the series of teeth. A pair of individual drive actuators of the MEMS device moves the drive member with hysteresis-like movement in and out of engagement with the driven member. Another individual MEMS actuator moves radially and must engage with the wheel to prevent unwanted rotation, while the other pair of drive actuators is pulled out of the meshing.
    It is considered that the existing state of the art has defects, and it is further considered that advance the state of the art is both desirable and possible. For example, in each of the above designs, there are more actuators needed than desired. In the last example of patent 7,592,737, at least three MEMS actuators are required. In addition, the foregoing devices are more complicated than desired to minimize or prevent unwanted movement of the driven wheel.
    Accordingly, it is desirable to provide a training device where all the necessary goals and benefits can be achieved by the use of two MEMS actuators. Further, because of the improved design of the drive actuation assembly of the present invention, the preferred embodiments can provide constant engagement of the driven wheel, thereby preventing unintended movement thereof. this. In addition, the design of the present invention further results in a reduced number of required control signals compared to those contemplated to date to achieve all the necessary functionality. Other objects and features relating to prior art defects are also provided as described herein.
    SUMMARY AND GOALS OF THE INVENTION
    It is therefore an object of the present invention to overcome the perceived defects of the prior art.
    [0007] Specifically, it is an object of the present invention to provide an improved drive device for an electronic device that utilizes the advantages afforded by the use of MEMS technology.
    Another object of the present invention is to provide an improved drive device for an electronic device, which utilizes the advantages offered by the use of MEMS technology but which simultaneously reduces the number of actuator parts. necessary, however, to provide a directional drive arrangement.
    Yet another object of the present invention is to provide an improved MEMS drive device which uses a combination of drive ring and driven wheel which preferably do not disengage from at least one some meshing to prevent slippage or loss of calibration or accuracy of the display indicators controlled by the driver.
    Yet another object of the present invention is to provide an improved MEMS training device which allows the construction and use of a smaller and stronger training set than those encountered so far in the technique.
    Yet another object of the present invention is to provide methodologies for implementing and / or facilitating the foregoing.
    Other objects and advantages of the present invention will be more apparent following an examination of the drawings and the description which follows.
    The invention accordingly comprises the characteristics of construction, combination of elements, arrangement of parts and sequence of steps which will be given as an example in the construction, the representation and the description below, and the scope of the invention will be indicated in the claims.
    Therefore, and in general, according to a first aspect, the invention relates to a device for driving microelectromechanical systems (MEMS) electronic device. The microelectromechanical system drive (MEMS) device of the invention comprises a driven wheel having a diameter, having (n) teeth on its outer periphery, wherein (n) is a positive integer; an actuating ring having an inside diameter which is larger than the diameter of the driven wheel, comprising (n) + (x) teeth on its inner periphery and wherein (x) is an integer equal to at least 1; wherein subsets of the (n) + (x) teeth of the actuating ring will progressively mesh with and disengage from subassemblies of (n) teeth of the driven wheel; a drive actuation assembly, connected to the actuating ring, for driving the actuating ring in a hysteresis-type motion to cause rotation of the driven wheel, the actuating assembly driving apparatus comprising: a first drive actuator coupled to the actuating ring for selectively pulling the actuating ring in a first direction and urging the actuating ring in a direction opposite to the first direction thereby causing subsets of the (n) + (x) teeth of the actuating ring to mesh with and disengage from subassemblies of the (n) teeth of the driven wheel; a second drive actuator connected to the actuating ring for selectively pulling the actuating ring in a second direction and urging the actuating ring in a direction opposite to the second direction, the first direction being perpendicular to the second direction, thus causing the (n) + (x) teeth of the actuating ring to mesh with sub-sets of (n) teeth of the driven wheel and to disengage therefrom; in which, after a complete cycle of meshing and disengagement between selective subassemblies of the (n) teeth of the driven wheel with selective subassemblies of the (n) + (x) teeth of the actuating ring, the driven wheel rotates by [(360) (x) / (n)] °.
    According to another aspect, the invention relates to a method of driving a driven wheel of a device for driving microelectromechanical systems (MEMS) electronic device. In such a preferred method, and using the microelectromechanical system drive (MEMS) device as defined above, the method comprises the steps of selectively pulling the actuation ring in a first direction and selectively pushing the actuating ring in a direction opposite to the first direction, the first drive actuator thereby causing selected sub-sets of the (n) + (x) teeth of the actuating ring to mesh with sub-assemblies. assemblies of the (n) teeth of the driven wheel and disengage therefrom; selectively pulling the actuating ring in a second direction and selectively biasing the actuating ring in a direction opposite to the second direction, the second driving actuator thereby providing selected subsets of the (n) + (x) teeth of the actuating ring to mesh with and disengage from subassemblies of the (n) teeth of the driven wheel; wherein: the first direction is perpendicular to the second direction; and after a complete cycle of meshing and disengagement between selective subassemblies of the (n) teeth of the driven wheel with selective subassemblies of the (n) + (x) teeth of the actuating ring, the driven wheel rotates by [(360) (x) / (n)] °.
    In a preferred embodiment, the training device is worn on the wrist in a timepiece having the shape of a wristwatch.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The above and other features of the invention are made more apparent by the following description of preferred embodiments when read in conjunction with the accompanying drawings, in which: FIGS. . 1A and 1B each represent a bi-directional MEMS driver constructed in accordance with preferred embodiments of the present invention; figs. 2, 3, 4 and 5 show the successive movements of an actuating ring and a driven wheel upon actuation by the drive actuating assemblies of FIGS. 1A and / or 1B, all constructed in accordance with preferred embodiments of the present invention; fig. Figure 6 is a preferred diagram of the actuation of a drive actuator in the x direction and a drive actuator in the y direction, given as an example; fig. 7 is a block diagram of an exemplary configuration for controlling MEMS drive devices of the preferred embodiments of the present invention; and FIG. 8 is an exemplary configuration of an electronic device, and for example a timepiece, which incorporates preferred embodiments of the present invention.
    Identical numerals in the figures indicate like parts, whereas any feature of any figure may not be indicated by a numerical reference.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
    We will first generally refer to FIGS. 1A and 1B which show a bidirectional microelectromechanical systems (MEMS) drive device, generally indicated by 10 and 10A, respectively, constructed in accordance with preferred embodiments of the present invention. Reference will here be made generally to a MEMS drive device 10, but it should be understood that the MEMS drive device 10A is constructed and operates identically, except for the difference in configuration of the devices. arm 105,205 and arms 105A, 205A, as further described below. In a preferred embodiment, the MEMS driver 10 comprises, inter alia, a driven wheel 20 having a diameter, including (n) teeth on its outer periphery, wherein (n) is an integer preferably in the range of about 300 to about 1000; an actuating ring 30 having an inside diameter which is larger than the diameter of the driven wheel, comprising (n) + (x) teeth on its inner periphery and where (x) is an integer equal to at least 1 and preferably 1, 2,3 or 4; where the (n) + (x) teeth of the actuating ring will gradually mesh with and disengage from different subsets of the (n) teeth of the driven wheel 20, as described herein. It is however ensured that (n) may be smaller or larger than the numbers indicated above while remaining in the present invention. Similarly, (x) may be greater than 4 if such design requirements dictate or are desirable.
    The driving device 10 also comprises a driving actuation assembly, generally indicated at 40, connected to the actuating ring 30, for driving the actuating ring 30 in a movement of type to hysteresis to cause rotation of the drive wheel 20. In a preferred embodiment, the drive actuation assembly 40 includes a first drive actuator, generally designated 100, connected to the drive ring. actuator 30 for selectively pulling the actuating ring 30 in a first direction and urging the actuating ring 30 in a direction opposite to the first direction; and a second drive actuator, generally designated 200, connected to the actuating ring 30 for selectively pulling the actuating ring 30 in a second direction and urging the actuating ring 30 in a direction opposite to the second direction.
    By way of illustration only, the "first" direction will be described here as being in the "X" direction (for example horizontal) and the "second" direction will be described as being in the "Y" direction (for example vertical). However, this is simply given as an example, as will be understood.
    As will be seen in more detail below, after a complete cycle of meshing and disengagement between selective subassemblies of (n) teeth of the driven wheel 20 with selective subassemblies of (n) + (x) teeth of the actuating ring 30, the driven wheel 20 is considered to have turned of (x) teeth corresponding to [(360) (x) / (n)] °.
    More specifically, when the actuating ring 30 is moved through its hysteresis type movement, the teeth of the actuating ring 30 will gradually mesh with the teeth of the driven wheel 20 and disengage from them. This meshing effect involves rotation to the driven wheel 20.
    Preferred dimensions of the driven wheel 20 and the actuating ring 30 will be known to those skilled in the art and are therefore a design routine choice. Preferably, the shape of the teeth of the driven wheel and the actuating ring may be triangular, but they may also have other shapes, such as trapezoidal to possibly reduce the probability of interference between the respective teeth when they mesh as described here. In preferred embodiments of the present invention, the number of teeth of driven wheel 20 is three hundred (300) and six hundred (600) and the preferred number of teeth for actuating ring 30 is furthermore, the number of teeth of the driven wheel 20, therefore, is 301 and 601 respectively for the two preferred embodiments mentioned above (for the sake of doubt, the number of teeth of the driven wheel and the The actuating ring as shown in the accompanying figures is smaller than the preferred numbers of 300, 600 for the driven wheel 20, but this was done as a representation only).
    It should be known that because of the very fine structure of the MEMS actuator combs and corresponding manner of possible limited displacement (stroke) that the moving part of these fine structure combs can perform, the size and the pitch respective teeth must therefore also be very thin. Therefore, while the numbers illustrated are of the order of 60 teeth (for the driven wheel 20) and 61 (for the actuating ring 30), in reality, the numbers of teeth are significantly higher. In addition, as will be understood by those skilled in the art, the number of teeth chosen for the driven wheel 20 and the actuating ring 30 will lead to a certain size of the wheel and thus the entire MEMS unit.
    In addition, while the preferred number of teeth (n) of the driven wheel 20 is from about 300 to about 1000, and in the particularly preferred examples of 300 and 600, the number of teeth of the ring the actuation method will be higher as explained herein by a number (x), which is preferably (1) for the reasons set out below, but may also be for example (2) or (3) or (4).
    [0026] In other words, for a relatively small driven wheel 20, a preferred embodiment uses 300 teeth for the driven wheel 20 and 301 teeth for the actuating ring 30. For a slightly larger design, the wheel 20 can have 600 teeth and so there would be 601 teeth on the actuating ring 30.
    The reason why the preferred difference, that is to say (x), the number of teeth between the driven wheel 20 and the actuating ring 30 is only one (1) is that one is sure that the diameters of the driven wheel 20 and the actuating ring 30 are small and close enough to ensure that there is no possibility of disengagement between the driven wheel 20 and the actuating ring 30. However, with a difference (x) that is greater than one (1) between the number of teeth of the driven wheel 20 and the actuating ring 30, the risk is increased that the actuating ring 30 can move elastically in a median position, so that the driven wheel 20 becomes positioned somewhat in the center of the actuating ring 30, where it would be free of any meshing between the driven wheel 20 and the actuating ring 30.
    The features of the drive actuators 100, 200 will now be described in more detail in connection with the movement of the actuating ring 30, the drive actuator in the "x direction" being identified by the the drive actuator 100 and the drive actuator in the "y direction" being identified by the drive actuator 200. However, reference will be made more specifically to the drive actuator 100 in the x direction, the y-direction drive actuator 200 being constructed and operating in the same manner as the drive actuator in the x-direction 100. For further details of such drive actuators, reference may be made to US Pat. No. 7,592,737, the subject matter of which is incorporated by reference as fully described herein.
    In the preferred embodiment of FIG. 1A, the drive actuator 100 in the "x-direction" includes, inter alia, a drive member in the form of an arm 105, extending outwardly from a movable portion 120, which will be described in more detail below. As illustrated in FIG. 1A, the arm 105 may be considered linear (ie, I) or "L", depending only on its subjective frame of reference. In the preferred embodiment of FIG. 1B, the drive actuator 100A in the x direction includes, among other things, a drive member in the form of an arm 105A also extending outwardly from a movable portion 120A, which is identical to the moving part 120. As shown in FIG. 1B, the arm 105A may be considered "T" shaped, but in all other respects the drive actuating assembly 40 and the driving actuating assembly 40A are the same. The arms 105, 105A are preferably rigid and non-elastic and form part of the MEMS structure. Connected respectively to the arms 105, 105A there are two additional arms 106, 106A, and 108, 108A. The arms 106, 106A on the one hand, and the arms 108, 108A on the other hand, depending on the design or the shape of the arms 105, 105A, may have the same length or have two different lengths as illustrated, and their respective distal ends are connected to the actuating ring 30 all having a unitary MEMS structure at the positions illustrated in respective Figures 1A and 1B. To be sure, however, the arm 106 is provided to have the same length as the arm 106A and the arm 108 is provided to have the same length as the arm 108A. The distal ends of the arms 106, 106A are connected to the actuating ring 30 in the quadrant I, and in particular at an angle of substantially 45 ° with respect to a horizontal axis passing through the actuating ring 30. The distal ends of the arms 108, 108A are preferably connected as part of a unitary MEMS structure to the actuating ring 30 in a position which can be considered as along the Y axis, substantially at 135 ° in the clockwise direction measured from the first point of connection of the respective arms 106, 106A. The respective figures 1A, 1B illustrate these positions.
    A similar arrangement exists with respect to the drive actuator 200 in the "y direction". For example, in the preferred embodiment of FIG. 1A, the drive actuator 200 in the "y direction" includes, among other things, a drive member in the form of an arm 205, extending outwardly from a movable portion 220 which acts identically to the movable part 120. As illustrated in FIG. 1A, the arm 205 can also be considered linear (that is to say I) or "L". The drive actuator in the "y direction" 200A in FIG. 1B also includes a drive member in the form of an arm 205A also extending outwardly from a movable portion 220A, which is identical to the movable portion 220. In Fig.1B, the arm 205A may be considered to be in the shape of a "T". Here too, the arms 205, 205A are preferably rigid and non-elastic, such as the arms, 105, 105A. Respectively connected to the arms 205, 205A there are likewise two additional arms 206, 206A and 208, 208A. The arms 206, 206A are preferably of the same length as the arms 106, 106A and the arms 208, 208A are preferably also of the same length as the arms 108, 108A. Similarly, the respective distal ends of the arms 206, 208, 206A and 208A are likewise connected to the actuating ring 30 as part of a unitary MEMS structure, as illustrated by the respective figures. For example, the distal end of the arms 206,206A is also connected to the actuating ring 30 in the quadrant I at an angle of substantially 45 ° to a horizontal axis passing through the actuating ring 30. The ends distal arms 208, 208A are preferably connected by the same means to the actuating ring 30 in a position that can be considered on the X axis, substantially 135 ° in the counterclockwise direction measured from the first point of connecting respective arms 206, 206A. The respective figures 1A, 1B illustrate these positions.
    As can be seen, the arms 106, 106A and the arms 108, 108A are parallel to the direction of movement of the movable portion 120, 120A, respectively, and the arms 206, 206A and the arms 208, 208A are parallel to the direction of movement of the movable portion 220, 220A, respectively.
    The reason for the preferred use of at least two long thin arms 106, 106A and 108, 108A for the drive actuators in the x direction and at least two long thin arms 206, 206A and 208, 208A for the drive actuators in the y direction is to allow only parallel movement of the actuating ring 30 in the respective "x" and "y" directions without remarkable rotation. The two respective long thin arms associated with the drive actuator 100,200 and 100A, 200A act similarly to two parallelogram suspensions, where a drive actuator 100,100A can control the displacement of the position of the drive ring. actuation 30 only in the x direction and the other drive actuator 200, 200A can control the displacement of the position of the actuating ring 30 only in the y direction. If the lengths of the two long thin arms are not the same, as shown in Figs. 1A, 1B, there will be sufficiently parallel movements with negligible rotational movement of the actuating ring.
    It should be understood that more than two long thin arms for each of the drive actuators are not necessary, but are possible to the extent that they are flexible enough to be folded in the lateral direction.
    As will be understood quickly, the arms 106, 106A and 108, 108A cause the actuating ring 30 to move in the direction "X" and, more particularly, both to the right (for example as illustrated by FIG. the arrow "Xpos" in Fig. 1A, 1B) and to the left (for example, as shown by the arrow "Xneg" in Fig. 1A, 1B).
    Similarly, the arms 206, 206A and 208, 208A cause the actuating ring 30 to move in the direction "Y", and more precisely, both upwards (for example as illustrated by FIG. arrow "Ypos" in Fig. 1A, 1B) and down (for example, as shown by arrow "Yneg" in Fig. 1A, 1B).
    The drive actuator 100 in the x direction and the drive actuator 200 in the y direction are preferably electrostatic modules having a comb structure as will now be described with particular reference to the the drive actuator 100 in the x direction because the drive actuator in the direction y acts in an identical manner. Although further details of the x-direction drive actuator will now be provided, all references in this disclosure to the drive actuator 100 also apply to the actuator 100A and all references in the present description for the drive actuator 200 also apply to the actuator 200A as well.
    The drive actuator 100 in the x direction is formed of a "fixed" portion 115 and a "movable" portion 120, the latter being connected to the arm 105. It must be understood that by "fixed Is meant to indicate an element, a part or an organ that is embedded in the substrate, while the term "mobile" is intended to indicate an element, a part or an organ that is positioned a few microns above the substrate by elastic suspensions (shown below), which are also integrated into the substrate.
    The fixed portion 115 comprises a radial electrode 125 from which a fixed set of parallel combs 130 extends outwardly. Each comb 130 is formed of a main stem and a series of parallel fingers connected to the rod and extending perpendicularly thereto.
    The movable portion 120 comprises a frame 135 which has a general shape of U and which extends around the fixed portion 115. The frame 135 is connected at each of its ends to the substrate, via links of coating 140A, 140B, comprising the elastic suspensions. The combs 145 extend from the base 135 in a general outward direction, and are similarly formed from a main stem and a series of parallel fingers connected to the stem and extending perpendicular to it.
    The combs 130 of the fixed part 115 and the combs 145 of the movable part 120 are arranged parallel to each other and interposed with each other, so that each comb 145 is located vis-a-vis a fixed comb 130 so that their fingers are interposed with each other.
    The drive actuator 200 in the direction y has a structure similar to that of the drive actuator 100 in the x direction, except that the drive actuator 200 in the direction y is oriented perpendicularly to the drive actuator 100 in the x direction.
    In operation, the interposed comb fingers are similar to flat capacitors, one of whose plates is connected to the electrode 125 of the drive actuator 100 in the x direction or the corresponding electrode 225 of the the drive actuator 200 in the y direction, the other plate being connected to ground by the respective embedding links 140A, 140B of the drive actuator 100 in the direction x and 240A, 240B of the actuator 200 drive in the y direction.
    Regarding the drive actuator 100 in the x direction, when a voltage is applied to the radial electrode 125, this voltage creates a potential difference between the fixed portion 115 and the movable portion 120 An electric field is established between the capacitor plates formed by the fingers of the combs 130 and 145. This electric field produces an electrostatic force which displaces the combs 145 relative to the stationary combs 130 in a direction parallel to the comb fingers. moves the arm 105 in a corresponding direction. In other words, the electrostatic force acting between the fingers of the combs results in the displacement of the frame 135 and, consequently, to a linear movement of the arm 105 in a direction Xpos, with respect to the actuating ring 30.
    Similar operation occurs with respect to the drive actuator 200 in the y direction, in that when a voltage is applied to the electrode 225, the created electrostatic force results in the linear displacement. arm 205 in the direction Ypos with respect to the actuating ring 30.
    In other words, if there is no voltage difference applied between the electrode 125 having its connected combs 130 and the combs 145 connected to the movable part 120, or between the electrode 225 having its associated combs When connected to the mobile part 220, there will be no electrostatic force produced, and the actuating ring 30 will be held in its rest position by the elastic forces between the respective combs. This initial position is represented as the starting position in FIGS. 1A, 1B and as the end position in FIG. 5 after a complete actuation cycle. On the other hand, if a voltage difference is applied between the electrode 125 having its connected combs 130 and the combs 145 connected to the mobile part 120, and / or between the electrode 225 having its connected combs and the combs connected to the moving part 220, one or more electrostatic attraction forces is or are produced in the corresponding drive actuators in the x direction and / or the y direction, and the actuating ring 30 is pulled into the direction x and / or the corresponding y direction.
    Other details of the actuators 100, 200 that are not important to the present invention can be found in the aforementioned US Pat. No. 7,592,737.
    We then refer to FIGS. 2 to 5, which represent the successive phases of the displacement of the actuating ring 30 and the rotation of the driven wheel 20.
    By way of illustration, FIG. 1A can be considered as an initial position of the exemplary operating ring 30, where neither the drive actuator 100 in the x direction nor the drive actuator 200 in the y direction are shown as being actuated. Therefore, and because of their respective spring characteristics, the arm 105 of the drive actuator 100 in the x direction can be seen as the "push" actuating ring 30 in the Xneg direction and the The drive actuator 200 in the y direction can be seen as the "push" actuation ring 30 in the Yneg directions. The actions of both the drive actuator 100 in the x direction and the drive actuator 200 in the direction thereby cause the actuating ring 30 to be pushed against the driven wheel 20, essentially in the 45 ° zone in quadrant I (see Fig. 1A, 1B). It is therefore in this area at 45 ° in the quadrant I that the deepest meshing of the actuating ring 30 and the wheel driven in this state of the drive actuator 100 in the x direction and the drive actuator 200 in the y direction. In this state, we can see in fig. 1A that the tooth of the driven wheel 20 indicated as "1" is engaged and located to the left of the tooth of the actuating ring 30 which is indicated as "A".
    Then, and as illustrated in FIG. 2, upon actuation of the drive actuator 100 in the x direction as indicated above the arm 105 causes a "pull" of the actuating ring 30 in the Xpos direction. The drive actuator 200 in the y direction is always (and intentionally) not actuated, and because of its spring characteristics, the drive actuator 200 in the y direction continues to cause the arm 205 to "push" The actuating ring 30 in the Yneg direction. As a result, the actuating ring 30 will be pushed against the driven wheel 20 in the 45 ° zone in quadrant II. It is therefore in this area at 45 ° in the quadrant II that the deepest meshing of the actuating ring 30 and the driven wheel 20 in this state of the drive actuator 100 in the x direction and the drive actuator 200 in the y direction. Here, it can also be seen that the tooth of the driven wheel 20 indicated as "1" is still meshing and to the left of the tooth of the actuating ring 30 which is indicated as "A", although the tooth " A "has moved slightly away from the right side of tooth" 1 ".
    Referring now to FIG. 3, which represents the state in which the drive actuator 100 in the x direction is still in its actuated state and thus the arm 105 "pulls" the actuating ring 30 in the Xpos direction. In addition, the drive actuator 200 in the direction y is now also in its actuated state and also pulls the actuating ring 30 in the Ypos direction. The actions of both the drive actuator 100 in the x direction and the drive actuator 200 in the direction thereby cause the actuating ring 30 to be pushed against the driven wheel 20, mainly in the 45 ° zone in quadrant III (see Fig. 1). It is therefore in this area at 45 ° in quadrant III that there will be the deepest meshing of the actuating ring 30 and the driven wheel 20 in this state of the drive actuator 100 in the x direction and the drive actuator 200 in the y direction. Here, it can also be seen that the tooth of the driven wheel 20 indicated as "1" begins to disengage from the actuating ring 30 and is only slightly to the left of the tooth "A" of the ring. actuation 30.
    Referring now to FIG. 4 which represents the state in which the drive actuator 100 in the x direction is now again in its non-actuated state and thus the arm 105 "pushes" the actuating ring 30 in the Xneg direction while the The drive actuator 200 in the direction y is still in its actuated state and "pulls" the actuating ring 30 in the Ypos direction. The actions of both the drive actuator 100 in the x direction and the drive actuator 200 in the direction thereby cause the actuating ring 30 to be pushed against the driven wheel 20, essentially in the 45 ° area of quadrant IV. It is therefore in this area at 45 ° of the quadrant IV that the deepest meshing of the actuating ring 30 and the driven wheel 20 in this state of the drive actuator 100 in the direction will exist. xand the drive actuator 200 in the y direction. In this state, it can also be seen that the tooth of the driven wheel 20 indicated by "1" is meshing again with the actuating ring 30, but has now passed the tooth "A" from the actuating ring 30 to the right thereof.
    Finally, reference is made to FIG. 5, which shows the state in which both the drive actuator 100 in the x direction and the drive actuator 200 in the y direction are in their respective non-actuated states, and thus the two arms 105, 205 " again push the actuating ring 30 in the Xneg direction and the Yneg direction, respectively, due to their respective spring characteristics. The actions of both the drive actuator 100 in the x direction and the drive actuator 200 in the direction thereby cause the actuating ring 30 to be pushed again against the driven wheel 20 essentially in the 45 ° zone in the quadrant I. It is therefore in this area 45 ° quadrant I that will exist the deepest meshing of the actuating ring 30 and the driven wheel In these non-actuated states of the drive actuator 100 in the x direction and the drive actuator 200 in the y direction. In this state, it can also be seen that the tooth of the driven wheel 20 indicated by "1" has now passed the tooth "A" of the actuating ring 30, and is now to the right of the tooth "A" of the actuating ring 30.
    As can be seen from the above, the actuating ring 30 is moved (without rotation) in a hysteresis-type movement first in the Xpos direction, then in the Ypos direction, then in the Xneg direction and finally in the Yneg direction, the result being that during this complete cycle of movements the outer teeth of the driven wheel 20 rolled through the full number of inner teeth of the actuating ring 30, but the Since the number of teeth of the actuating ring 30 is larger than the number of teeth of the driven wheel 20, the driven wheel 20 has been rotated exactly the number of teeth corresponding to the difference between the number of teeth. teeth between the actuating ring 30 and the driven wheel 20. For example, in the embodiment shown, the difference in the number of teeth between the actuating ring 30 and the driven wheel 20 is one (1). . Therefore (and we see it), the sequence of the above steps results in the driven wheel turning by 1 tooth.
    As indicated above, the driven wheel 20 can therefore be considered to have rotated from (x) teeth corresponding to [(360) (x) / (n)] °, or in a first preferred embodiment, of a tooth. Using the preferred examples set forth above, with (n) equal to 300 and (x) equal to 1 (i.e., the driven wheel has 300 teeth and the actuating ring has 301 teeth), then it can be seen that a complete drive cycle of the actuating ring will result in a rotational angle of the driven wheel of 1.2 °. However, with the same number of teeth on the driven wheel 20, an increased number of teeth differential on the actuating ring 30 will result in further rotation of the driven wheel 20 for an entire sequence of ring motions. For example, if the number of teeth differential is two (2) and the number of teeth of the driven wheel 20 remains at 300, then the driven wheel will rotate 2.4 ° in a complete cycle. meshing and disengaging (ie from Fig. 1 to Fig. 5). Other changes in (n) and / or (x) will result in different amounts of rotation for a given complete cycle of meshes and dislocations as will be understood by those skilled in the art.
    FIG. 6 is an exemplary signal sending scheme for the activation and deactivation of the drive actuator 100 in the x direction and the drive actuator 200 in the y direction to implement the sequence preceding of figs. 1 to 5.
    In addition, as will be understood by those skilled in the art, the frequency of the signals will preferably be a function of the shape and size of the driven wheel 20, and other gears and, for example, display needles. , which is / are driven by the driven wheel 20. Other control and signaling characteristics will be understood by those skilled in the art.
    As should now be noted, the present invention is well suited for applications, such as for the engine or engines of a timepiece, for example. For example, the present invention simplifies a conventional drive gear train by replacing step motors with a driven wheel. Alternatively, and even in another simplification, the usual wheel sets can be replaced by a driven wheel 20, which could be coupled to a display pointer to be driven. This direct connection of the driven wheel to the display indicator could further simplify the construction and result in the elimination or reduction of gears previously deemed necessary. In each of these embodiments, a designer of the art now knows how to adjust and determine torque constraints, appropriate speed reductions, and the like.
    For example, reference is also made to FIGS. 7 and 8 which respectively show a block diagram of a MEMS drive unit including the preferred embodiments of the present invention and an exemplary timepiece which includes the constructions set forth above, including but without limitation, the preferred embodiments of the present invention and the functionality established in FIG. 7.
    As illustrated in FIGS. 7 and 8, the preferred embodiments of the present invention are preferably incorporated into a timepiece, but those skilled in the art will appreciate that the uses and advantages thereof may be more varied and widespread. To this end, the subject matter of US Patent No. 7,113,450, which discloses only a few uses of the present invention in electronic devices other than conventional wrist watches, is hereby incorporated by reference as if it were fully integrated here. . However, since the preferred embodiment is a timepiece and in particular a wristwatch, it will be understood that such a timepiece will include other devices and parts that are not part of this invention.
    In view of this, and other concepts well known to those skilled in the art, coupling one or more driving wheels 20 as described herein to one or more gears and / or gear trains and / or to display indicator itself to rotate, rotate and / or otherwise move one or more display indicators, such as display hands (for example, hour, minute and / or second hands) and / or rings and / or even linear display needles, will not be described since it is entirely within the skill of the art. To be sure, the description of the aforementioned patent 7 113 450 can be consulted for this purpose. For example, as discussed above, an exemplary example driven wheel may be used to replace a conventional stepper motor rotor and / or the usual gear train itself and the number of such driving wheels. 20 in any electronic device varies on the basis of many factors, including, but not limited to, the number of display indicators to be used. For example, if the driven wheel 20 and the associated display indicator are coupled by a corresponding gear or gear train, exemplary constructions are defined in many patents of the present assignee, including, but without to be limited to the above-mentioned patent 7 113 450.
    For this purpose, FIG. Figure 7 provides an exemplary block diagram of a larger device, generally indicated by 500, that utilizes one of the MEMS drive arrangements 10, 10A described herein. For example, an arrangement 500 comprises a control, generally indicated by 600, a multiplexer and voltage driver generally indicated by 700, and a MEMS drive arrangement (either arrangement 10 or 10A is adapted, although that Fig. 7 shows the arrangement 10A, but this is by way of example only and not limitation).
    As described above, the driven wheel 20 is preferably capable of rotating in both directions and in small increments, as understood in the art. It should also be understood that it is entirely within the skill of the designer to design a suitable gear ratio to provide the desirable rotation or displacement of the display of all the display indicators to be used. For example, it may be desirable for the incremental rotation of the needle to be very small (eg for a compass), thus ensuring accurate increments and display measurements. At a minimum, the typical rate of rotation (with and / or without gears) will be configured to rotate, rotate, and / or appropriately displace a display indicator, such as a hour, minute, and / or second hand. similar.
    The control 600 is preferably an integrated microcontroller or an ASIC generally used with the electronic watches, and provides control signals as described in FIG. 6 for a multiplexer and voltage driver 700 as is understood in the art. In turn, the multiplexer / driver 700 is coupled to each of the drivers 10 and / or 10A included in the watch, and emits pulsed signals and other signals necessary to move each of them. In other words, while fig. 7 shows the inclusion of a single drive device 10 or 10A, it should be understood that this is given by way of example only and not limitation. In other words, in view of the above, several MEMS control devices can be coupled to the control 600 and the multiplexer / driver 700 in a known manner, this being the domain, and being known to a person skilled in the art and a designer. In this way, the one or more drive actuators 100 in the x direction and the one or more drive actuators 200 in the y direction can be driven in the directions indicated above, thereby causing each driven wheel 20 to rotate. described herein and incorporated in the electronic device. If necessary, non-essential details regarding the functionality and construction of the control 600 can be obtained by referring to the order of the aforementioned Patent 7,113,450. Again, all the details, for example, of the display control, circuit design, control functionality and exemplary constructions of embodiments that utilize the present invention can be found in Patent 7. 113 450, which is incorporated by reference as if it were whole here. In a preferred embodiment, a conventional battery or a hydrogen-based fuel cell ("E-cell") may be used as the power supply 500.
    FIG. 8 shows an exemplary timepiece, generally indicated as 1000, which includes a plurality of MEMS drivers, generically indicated 10, 10A and provided to refer to devices 10 or 10A. A configuration of one (or more) control 600 and a multiplexer / driver 700 may be used as will be understood in the art to operate the respective drivers 10 and / or 10A. Fig. Figure 8 shows four (4) MEMS drive devices 10 or 10A, each having an associated gear train 505, 510, 515 and 520, which in turn is coupled to one or more of the training indicators as understood. in the art. However, as indicated above, the preferred embodiment may omit the gear trains if desired and have the associated driven wheel directly coupled to the display indicator, if desired.
    In addition, the arrangement above has the additional advantage of being able to operate in the opposite direction (ie to rotate the driven wheel 20 counterclockwise as opposed to the clockwise direction). as illustrated in the sequence of Figures 1 to 5). This is easily accomplished by reversing the order of activations and deactivations of the drive actuator 100 in the x direction and the drive actuator 200 in the y direction, as now understood from the description.
    权利要求:
    Claims (11)
    [1]
    It can thus be seen that the present invention provides an improved actuation device for an electronic device that utilizes the benefits provided by the use of MEMS technology. For example, the present invention enables the reduction in the number of actuator parts needed to further provide a bi-directional drive using such MEMS technology. In addition, here, the embodiments do not allow disengagement between the actuating ring and the driven wheel, thus preventing slippage or loss of calibration or accuracy of the display indicators controlled by the device. drive due to any unwanted rotation of the driven wheel. The present invention also provides the construction and use of a smaller and stronger drive assembly than heretofore observed in the art. Thus, it can be seen that the aims set out above, among those made apparent from the foregoing description, are effectively achieved and, since certain changes can be made in the above constructions without departing from the spirit and of the scope of the invention, it is intended that everything contained in the description above or shown in the accompanying drawings should be interpreted in an illustrative and non-limiting sense. It should also be understood that the following claims are intended to cover all the generic and specific features of the invention described herein and all elements of the scope of the invention. claims
    1. Device (10, 10A) for microelectromechanical systems, in English MEMS, for an electronic device (1000), the drive comprising: a driven wheel (20) having a diameter, having n teeth on its outer periphery, where n is a positive integer; an actuating ring (30) having an inside diameter which is greater than the diameter of the driven wheel, comprising n + x teeth on its inner periphery and wherein x is an integer equal to at least 1; wherein subsets of the n + x teeth of the actuating ring (30) will gradually mesh with and disengage from the subsets of n teeth of the driven wheel (20); a driving actuation assembly (40, 40A), coupled to the actuating ring (30), for driving the actuating ring (30) in a hysteresis-like motion to cause rotation of the the driven wheel (20), the drive actuation assembly (40, 40A) comprising: a first drive actuator (100, 100A) coupled to the actuation ring (30) for selectively pulling the actuating ring (30) in a first direction and pushing the actuating ring (30) in a direction opposite to the first direction thus bringing subsets of the n + x teeth of the ring actuating (30) meshing with and disengaging from sub-assemblies of the n teeth of the driven wheel (20); a second drive actuator (200, 200A) coupled to the actuating ring (30) for selectively pulling the actuating ring (30) in a second direction and urging the actuating ring (30) into a direction opposite to the second direction, the first direction being perpendicular to the second direction, thereby causing the n + x teeth of the actuating ring (30) to mesh with sub-sets of n teeth of the driven wheel ( 20) and disengage from them; in which, after a complete cycle of the hysteresis type movement, the succession of meshes and meshes between selective subassemblies of the n teeth of the driven wheel (20) with selective subassemblies of the n + x teeth of the the actuating ring (30) rotates the driven wheel 360 ° · x / n.
    [2]
    The microelectromechanical systems drive device (10, 10A) according to claim 1, wherein the drive actuating assembly (40, 40A): moves the actuating ring (30) from a initial position, where both the first drive actuator (100, 100A) and the second drive actuator (200, 200A) are each respectively pushing the actuating ring (30) so that a subset of the n + x teeth of the actuating ring (30) meshes with a subset of the n teeth of the driven wheel (20), to a subsequent position by bringing the first drive actuator (100, 100A) to pull the actuating ring (30), while the second drive actuator (200, 200A) is still pushing the actuating ring (30), so that a different subset of the n + x teeth of the actuating ring (30) meshes with a different subset teeth of the driven wheel (20), and then moves the actuating ring (30) to a next position because both the first drive actuator (100,100A) and the second driving actuator (200, 200A) are each respectively pulling the actuating ring (30) so that still a different subset of the n + x teeth of the actuating ring (30) meshes with a different subassembly of the n teeth of the driven wheel (20), and then moves the actuating ring (30) to a position then following that the first drive actuator (100, 100A ) pushes the actuation ring (30), while the second drive actuator (200, 200A) is still pulling the actuating ring (30) so that a still different subassembly n + x teeth of the actuating ring (30) meshes with a different subset of the n teeth of the driven wheel (20), and then returns the actuating ring (30) to the initial position in that both the first drive actuator (100, 100A) and the second drive actuator (200, 200A) are each respectively pushing the actuating ring (30) so that a still different subassembly of the n + x teeth of the actuating ring (30) meshes with a sub all n teeth of the driven wheel (20).
    [3]
    The microelectromechanical systems drive device (10, 10A), MEMS, according to claim 1, wherein n is in the range of 300 to 1000 and x is an integer of 1.2, 3 or 4.
    [4]
    The microelectromechanical system drive device (10, 10A), MEMS, according to claim 1, wherein the driven wheel (20) can be driven both clockwise and counterclockwise by the assembly. driving actuator (40, 40A), and the driving actuation assembly (40, 40A) comprises only two drive actuators (100, 200, 100A, 200A).
    [5]
    5. Microelectromechanical systems drive device (10, 10A), MEMS, according to claim 4, in which there are permanently teeth of the actuating ring which are meshing with teeth. the driven wheel.
    [6]
    6. Microelectromechanical systems drive device (10, 10A), MEMS, according to claim 1, in which there are permanently teeth of the actuating ring (30) which are meshing. with teeth of the driven wheel (20).
    [7]
    The microelectromechanical system drive device (10, 10A), MEMS, according to claim 1, wherein each of the first (100, 100A) and second (200, 200A) drive actuators comprises: a drive (105, 105A, 205, 205A) extending outwardly from a movable portion (120, 120A, 220, 220A); and at least one first arm (106, 106A, 206, 206A) having a first length and at least one second arm (108, 108A, 208, 208A) spaced from the at least first arm and having a length different from the first length, each of the at least first arm and second arm comprising: a first end coupled to the driving member (105, 105A, 205, 205A); and a distal end connected to the actuating ring (30).
    [8]
    The microelectromechanical system drive device (10, 10A), MEMS, according to claim 7, wherein the drive element (105, 105A, 205, 205A) is a linear shaped member, shaped L or T-shaped.
    [9]
    A method of driving a driven wheel (20) in a drive device (10, 10A) of microelectromechanical systems, MEMS, electronic device, wherein the driving device (10, 10A) of systems micro-electromechanical apparatus, MEMS, comprises a driven wheel (20) having a diameter, having n teeth on its outer periphery, wherein n is a positive integer; an actuating ring (30) having an inside diameter which is larger than the diameter of the driven wheel (20), comprising n + x teeth on its inner periphery and where x is an integer equal to at least 1; wherein the n + x teeth of the actuating ring (30) will gradually mesh with sub-sets of n teeth of the driven wheel (20) and disengage therefrom; a driving actuation assembly (40, 40A), coupled to the actuating ring (30), for driving the actuating ring (30) in a hysteresis-like motion to cause a rotation of the driven wheel (20), the drive actuation assembly (40, 40A) comprising a first drive actuator (100, 100A) connected to the actuation ring (30) and a second drive actuator (40, 40A); drive (200, 200A) connected to the actuating ring (30), the method comprising the steps of: selectively pulling the actuating ring (30) in a first direction and selectively urging the actuating ring (30) in a direction opposite to the first direction with the first drive actuator (100, 100A) thereby causing selected sub-sets of n + x teeth of the actuating ring (30) to mesh with subassemblies of the n teeth of the driven wheel (20) and disengage from them; and selectively pulling the actuating ring (30) in a second direction and selectively pushing the actuating ring (30) in a direction opposite to the second direction with the second driving actuator (200, 200A), causing thus selected subassemblies of the n + x teeth of the actuating ring (30) to mesh with and disengage from subassemblies of n teeth of the driven wheel (20); wherein: the first direction is perpendicular to the second direction; and after a complete cycle of the hysteresis type movement, the succession of meshes and meshes between selective subassemblies of the n teeth of the driven wheel (20) with selective subassemblies of the n + x teeth of the actuating ring (30) turned the driven wheel 360 ° · x / n.
    [10]
    The method of claim 9, comprising the steps of: causing the actuation ring (30) to move from an initial position where both the first drive actuator (100, 100A) and the second actuator (200, 200A) each respectively push the actuating ring (30) so that a subset of the n + x teeth of the actuating ring (30) meshes with a subset of the n teeth of the driven wheel (20) to a next position by causing the first drive actuator (100, 100A) to pull the actuating ring (30), while the second drive actuator (200) , 200A) continues to push the actuating ring (30), so that a different subassembly of the n + x teeth of the actuating ring (30) meshes with a different subset of the n teeth of the driven wheel (20); causing the actuating ring (30) to move to a subsequent position by both the first drive actuator (100, 100A) and the second drive actuator (200, 200A). each respectively pulls the actuating ring (30) so that a still different subassembly of the n + x teeth of the actuating ring (30) meshes with a different subassembly of the n teeth of the wheel driven (20); and then causing the actuation ring (30) to move to a subsequent position, since the first drive actuator (100,100A) pushes the actuating ring and the second driving actuator ( 200, 200A) continues to pull the actuating ring (30) so that a still different subassembly of the n + x teeth of the actuating ring (30) meshes with a different subset of the n teeth of the driven wheel (20); and then causing the actuating ring (30) to return to the initial position because both the first drive actuator (100, 100A) and the second drive actuator (200, 200A) each push respectively the actuating ring (30) so that a still different subassembly of the n + x teeth of the actuating ring (30) meshes with a different subassembly of the n teeth of the driven wheel ( 20).
    [11]
    The method of claim 9, including the step of maintaining a continuous meshing of at least one or more of the n + x teeth of the actuating ring (30) with one or more of the n teeth of the wheel. driven (20) during the meshing and disengagement of the driven wheel (20) and the actuating ring (30).
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    同族专利:
    公开号 | 公开日
    EP2959571A1|2015-12-30|
    EP2959571A4|2016-12-07|
    US20140194241A1|2014-07-10|
    US8926465B2|2015-01-06|
    JP2016509542A|2016-03-31|
    CN105027416A|2015-11-04|
    CN105027416B|2018-01-09|
    WO2014107401A1|2014-07-10|
    JP6014776B2|2016-10-25|
    EP2959571B1|2018-05-02|
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    法律状态:
    2018-06-15| PK| Correction|Free format text: RECTIFICATION TITULAIRE |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/735,211|US8926465B2|2013-01-07|2013-01-07|Bidirectional MEMS driving arrangement|
    PCT/US2013/077922|WO2014107401A1|2013-01-07|2013-12-27|Bidirectional mems driving arrangement|
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