• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method for the positionally accurate equipping of a circuit carrier (2) with at least one electronic component (1) comprising at least two separately controllable light emitting surfaces (3a, 3b, 3c), comprising the following steps: a) optical detection of actual positions of the at least two light emitting surfaces (3a, 3b, 3c) of the electronic component (1), b) calculating at least one of the geometric position of the light emitting surfaces (3a, 3b, 3c) characterizing actual size (Sist) as a function of the actual positions of at least two light-emitting surfaces (3a, 3b, 3c) of the electronic component (1), c) comparison of the at least one actual variable (Sist) with at least one desired value (Ssoll) for calculating at least one correction variable (k), d) loading of the circuit carrier (2) with the at least one electronic component (1) as a function of the at least one correction variable (k).
    公开号:AT517259A1
    申请号:T50469/2015
    申请日:2015-06-09
    公开日:2016-12-15
    发明作者:Zorn Jürgen；Kieslinger Dietmar
    申请人:Zkw Group Gmbh；
    IPC主号:
    专利说明:

    Method for the positionally accurate assembly of a circuit carrier
    The invention relates to a method for the positionally accurate equipping of a circuit carrier with at least one electronic component, which comprises at least two separately controllable light-emitting surfaces.
    Furthermore, the invention relates to a circuit carrier having at least one electronic component, wherein the electronic component has at least two separately controllable light-emitting surfaces. Furthermore, the invention relates to a motor vehicle headlight with a circuit carrier according to the invention.
    Methods for the positionally accurate equipping of a circuit carrier with electronic components have become known from the prior art, each of which has exactly one light-emitting surface.
    Various developments in light technology have now made it possible to equip electronic components with at least two separately controllable light-emitting surfaces. Such a component may, for example, be the OSRAM LED light source marketed under the name "OSLON Black Flat" (model KW H3L531.TE), which can significantly reduce the number of electronic components to be arranged on a circuit carrier can be provided, for example, for use in an LED matrix headlight.
    Due to the presence of at least two separately controllable light emitting surfaces on a single electronic component in the assembly of such elements in the application of previously known methods has the problem that a prerequisite of these methods - namely that each electronic component has exactly one light emitting surface - is not met , In order to use the said methods, therefore, one of the at least two light-emitting surfaces would first have to be selected according to previously unknown criteria to be determined. In this case, however, the remaining light-emitting surfaces were disregarded. Becomes a
    Circuit carrier therefore equipped with electronic components comprising at least two light-emitting surfaces in a conventional manner, so optimal alignment of the components or the light-emitting surfaces can not be guaranteed. However, errors in the alignment / position of the light-emitting surfaces, in particular when used in a motor vehicle headlight, can lead to unacceptable inaccuracies and aberrations in the photograph of the motor vehicle headlight.
    It is therefore an object of the invention to provide a method for the positionally accurate equipping of a circuit carrier with at least one electronic component, which comprises at least two light-emitting surfaces which can be controlled separately from one another.
    This object is achieved by a method of the aforementioned type, which according to the invention comprises the following steps: a) optical detection of actual positions of the at least two light-emitting surfaces of the electronic component, b) calculation of at least one of the geometric position of the light-emitting surfaces characterizing actual Size as a function of the actual positions of the at least two light-emitting surfaces of the electronic component, c) comparing the at least one actual variable with at least one desired variable for calculating at least one correction variable, d) populating the circuit carrier with the at least one electronic component as a function of the at least one correction value.
    Thanks to the invention, it is possible to realize a positionally accurate equipping a circuit substrate with at least one electronic component, which comprises at least two separately controllable light-emitting surfaces, detects the position error of two or more light-emitting surfaces on the electronic component and by calculating a correction variable can be compensated.
    The optical detection of the actual positions of the electronic component is typically carried out using a camera system and suitable image processing algorithms, wherein the positions are detected with reference to a reference point, which may be formed for example on the electronic component or on the circuit carrier. The expression "(actual) position of a surface" does not only mean the dimension of the surface but also its position or spatial orientation in relation to the reference point.
    The nominal value is typically predefined values with respect to position and orientation of the light-emitting surfaces with respect to the reference point. The desired value is determined, for example, from the geometric desired position and nominal dimension of the light-emitting surfaces in relation to the reference point, which are previously known for example from a data sheet or can be calculated. More details will follow in the description of the figures.
    The equipping under point d) of the method takes place in consideration of the correction variable in that a predefined installation position is corrected with the aid of the correction variable to an actual installation position, in which the electronic component is applied to the circuit carrier, in particular soldered thereto. The correction variable is determined by means of a digital arithmetic unit and can be transferred in digital form to an equipping device.
    It can thus be provided that the actual variable characterizing the geometric position of the light-emitting surfaces and the setpoint quantity are fed to or recorded by a digital arithmetic unit in which the correction variable is calculated, wherein the correction variable is transmitted as a digital information signal to an equipping device for equipping Step d) is transferred.
    Preferably, it can be provided that the correction variable comprises at least one vector variable, the direction of the vector variable being oriented parallel to the component surface of the circuit carrier. In a Cartesian coordinate system consisting of the mutually orthogonal axes x, y and z, in which the axes x and y are oriented parallel to the mounting surface of the circuit substrate, the vector size therefore contains
    Information about amount and direction of a vector in the x-y-plane. The equipment can thus be corrected in the x and y directions.
    In addition, it may be favorable if the correction variable comprises an angle specification for rotation about a rotation axis z, wherein the rotation axis z is oriented orthogonal to the component surface of the circuit carrier. This makes it possible to change the orientation of the electronic component on the circuit carrier. As a prerequisite for this, it is of course provided that the target size contains information about a target orientation of the electronic component, so that the correction value can be calculated by comparing the actual size with the target size.
    In order to detect the orientation of the light-emitting surfaces in a simple manner, it may be provided that the at least one actual variable comprises information characterizing the course, in particular the inclination, of the visible edges of the light-emitting surfaces. This information may include, for example, the position of multiple points of the edge detected, for example, by conventional edge detection (e.g., by gradient filtering). The position of the edges is particularly important when used in lighting systems in which the course of the edges has a direct influence on the light image of the lighting system. This is e.g. in a motor vehicle headlamp with Abblendlichtfunktion the case in which no additional aperture is provided to establish a cut-off, but the light-dark boundary, for example, by the position of the light-emitting surfaces with respect to an optical system, such as a reflector set becomes. Other lighting functions in which defined light-dark transitions are important would be, for example, a cornering light function, a fog light function and an adaptive high beam.
    Alternatively, it may be provided that the at least one actual variable comprises information characterizing a virtual center of gravity of the light-emitting surfaces, wherein the virtual center of gravity is determined by determining the geometric center of gravity of the individual light-emitting surfaces taking into account their actual positions.
    In a further variant of the invention, it can be provided that the at least one actual variable comprises information characterizing the dimensions and position of a notional rectangular area, wherein the dimensions and the position and orientation of the notional rectangle are selected such that the ratio of coverage and Size of the area is optimized.
    These two last-mentioned information on the actual size are well suited to be used in the assembly of circuit carriers, which are set up to produce a high beam distribution. In this case, less the course of individual edges but rather the homogeneity of the overall light image of particular importance, the light images of individual light-emitting surfaces are typically at least partially superimposed, whereby the course of the individual edges is less important. Also, these methods are well-suited to the placement of circuit boards that are installed in imaging systems where light-dark boundaries are formed by additional aids, such as diaphragms.
    In particular, it can be provided that the setpoint variable comprises a position specification in relation to a reference point, wherein the reference point is arranged on the electronic component or the circuit carrier of the electronic component. In this case, the optical detection of the actual positions of the light-emitting surfaces also includes detection of the reference points, so that the positions with respect to the reference points can be measured.
    In a favorable embodiment of the invention, the light emitting surfaces may be spaced from each other. Alternatively, the light-emitting surfaces could be arranged on a single converter surface, wherein different regions of the converter surface can be triggered and activated by chips that can be controlled separately from one another.
    In particular, it can be provided that the at least one electronic component has a plurality of at least three, four or five light-emitting surfaces, which are preferably arranged in a row.
    It can be particularly favorable if the electronic component is an LED, preferably an SMD LED.
    In order to be able to detect the light-emitting surfaces more easily optically, it may be favorable to illuminate the light-emitting surfaces during step a) by means of an external light source.
    In particular, the light-emitting surfaces can be excited during the step a) for the emission of light. The excitation can be done either by illuminating in sufficient intensity by an external light source or by activation of the electronic component.
    In a further aspect, the invention relates to a circuit carrier having at least one electronic component, wherein the electronic component has at least two separately controllable light-emitting surfaces, characterized in that equipping the circuit carrier with the at least one electronic component as a function of the actual positions of at least two light-emitting surfaces of the electronic component according to an inventive method mentioned above.
    Moreover, the invention relates to a motor vehicle headlight with a circuit carrier according to the invention.
    The invention is explained in more detail below with reference to an exemplary and non-limiting embodiment, which is illustrated in the figures. It shows
    1 shows a schematic representation of a fictitious electronic component on a section of a circuit carrier,
    FIG. 2 a representation of the rear side of the electronic component,
    3a and 3b show a representation of a real electronic component with erroneously arranged light-emitting surfaces and a measure to counteract the error,
    4a and 4b, a representation of the electronic components according to FIG. 3a and a further measure to counteract the error,
    Figure 5 shows another electronic component with erroneously arranged light-emitting surfaces and a further measure to counteract the error, and
    FIG. 6 shows the electronic component according to FIG. 5 and a further measure to counteract the error.
    1 shows a schematic representation of a fictitious (the data sheet removed) electronic component 1 on a section of a circuit substrate 2, which was equipped with the electronic component 1 (fictitious). In the present example, the electronic component 1 has three light-emitting areas 3a, 3b and 3c which can be controlled separately from one another. From this fictive example, a target size can be determined in advance, with which the optically determined actual size can be adjusted during the actual placement process.
    Individual position data relate to the Cartesian coordinate system, consisting of the axes x, y and z, wherein the axes x and y are oriented parallel to the plane of the light-emitting surfaces and the axis z protrudes into the sheet plane. The choice of the coordinate system and its position can be freely determined by a person skilled in the art as long as a clear definition of the position of the light-emitting surfaces 3a, 3b and 3c is possible. Thus, a Cartesian coordinate system x ', y', z 'could also be used whose origin lies in a corner of the housing of the electronic component 1. Such corners can often be detected particularly easily by optical detection methods and downstream image processing algorithms. The origin of the selected coordinate system forms the reference point for position information.
    The light-emitting surfaces 3 a, 3 b and 3 c have a square shape with the side length 1 in the embodiment shown. They are arranged in a row and spaced from each other. In the example shown electronic component 1 is the aforementioned model of the series "OSLON Black Flat", wherein the housing of the electronic component has a side sl in the x and y direction between 2 and 10 mm and the width b of Row of the light-emitting surfaces 3a, 3b and 3c is approximately between 1.5 and 9 mm.
    The light emitting surfaces 3a, 3b and 3c each have centers Si, S2 and S3, which are offset with respect to the origin of the coordinate system x, y, z. Thus, all three centers of gravity Si, S2 and S3 have an offset y1 (for example between 0.1 and 0.6 mm, these values are taken from the data sheet) in the direction of the y-axis. The centers of gravity Si and S3 are also displaced in the x direction relative to the zero point of the coordinate system x, y and z. From the position of the individual light-emitting surfaces 3a, 3b and 3c and / or the centers of gravity Si, S2 and S3 can be a total center of gravity Sg (in the claims also referred to as virtual center of gravity) calculate the - since the data of the electronic component 1 shown the Setpoints (without tolerance) correspond - coincides with the desired center of gravity Ssoii. This desired center of gravity Ssoii can be used as a setpoint in the method according to the invention.
    FIG. 2 shows a representation of the rear side of the electronic component 1, in which the contact surfaces of the anodes A1 to A3 and the cathodes K1 to K3 are shown, which are assigned to individual chips, preferably LED chips, which are used to drive the light-emitting areas 3a, 3b and 3c are set up. After the placement of the circuit carrier 2 with the electronic component 1, sufficient contact of the cathode and anode surfaces with corresponding surfaces on the circuit carrier must be established. For this purpose, the contact surfaces can be coated, for example, with solder paste, in particular printed, and be firmly connected to the electronic component 1 in a reflow soldering process.
    Figure 3a and 3b shows a representation of a real electronic component 1, in which the light-emitting surfaces 3a, 3b and 3c are not in the selected positions taken from the data sheet (by dashed areas 3a ', 3b' and 3c 'indicated) are arranged, but deviations have this. All of the light-emitting surfaces 3a, 3b, 3c have an offset in the direction of the y-axis. The first light-emitting surface 3a is also outwardly offset from the direction of the x-axis. The individual focal points Si, S2 and S3 of the light-emitting surfaces 3a, 3b and 3c are no longer arranged on a common line in contrast to the electronic component 1 according to the data sheet (see FIG. 1). FIG. 3 a now shows a possibility of determining an actual variable associated with the offset light-emitting surfaces 3 a, 3 b and 3 c (a position in this example) which can be compared with a desired value Sson, namely the desired position of the overall center of gravity.
    For this purpose, a self-contained geometric shape is defined whose vertices are formed by the centers of gravity of the individual light-emitting surfaces. In this example, the centers of gravity Si, S2, and S3 form a triangle, which is shown schematically. The center of gravity of this triangle can be determined either geometrically by the lines of gravity indicated in FIG. 3 a or also mathematically and corresponds to the overall center of gravity of the light-emitting surfaces 3 a, 3 b and 3 c and can be used as the actual variable S ist. According to step c) of the method according to the invention, the actual variable Sist can now be compared with the desired variable Ssoii in order to determine a correction variable k from this. In this example, the target size contains coordinates for the x and y position of the entire desired center of gravity and the actual size coordinates for the x and y position of the entire actual center of gravity. By subtracting the coordinates of Ssoii and Sist, the correction quantity k can be calculated in the form of a vector, which can be used to correct the placement position of the electronic component 1 on the circuit carrier 2.
    This process is illustrated by way of example in FIG. 3a, in which a predefined placement position PI to an actual placement position P2 has been corrected by displacement of the electronic component by the vector of the correction variable k, so that the position of the corrected center of gravity Sist, corr with the position Ssoii matches. This process corresponds to step d) of the process according to the invention.
    The examples according to FIGS. 4 a, 4 b, 5 and 6 are concerned with other, optionally alternative aspects of the invention and make clear that the method according to the invention is widely applicable and not restricted to the variant according to FIGS. 3 a and 3 b.
    Thus, FIG. 4 a shows the electronic component 1 according to FIG. 3 a, wherein another possibility for correcting the position of the light-emitting surfaces 3 a, 3 b and 3 c is shown. Here, a balancing line between the individual centers of gravity Si, S2, and S3 is placed, wherein the inclination α of the best-fit line with respect to the x-axis (or y-axis) is detected and the position of the electronic component 1 according to FIG. 4b by shifting the electronic component 1 according to FIG. 3b and in addition by rotation about the z-axis is corrected by the angle α. The correction quantity k therefore comprises in this example both a vector quantity which comprises the coordinates of the displacement in the x and y direction, and an angle specification, namely the angle a, which indicates a rotation about the axis z.
    FIG. 5 shows a further real electronic component 1 with faultily arranged light-emitting surfaces 3a, 3b and 3c and a further measure to counteract the fault. In this case, edges e1, e2 and e3 of the light-emitting surfaces 3a, 3b and 3c are optically detected, for which purpose the position of at least two points of the edges e1, e2 and e3 must be determined. The position and the course of the edges can be averaged, so that, similarly to the method according to FIGS. 4 a and 4 b, a compensation straight line can be calculated whose inclination a can be used to correct the actual mounting position of the electronic component 1. The correction of the orientation of the edges el, e2 and e3 of the light emitting surfaces 3a, 3b and 3c is particularly important for motor vehicle headlight modules in which the individual light sources are sharply imaged in the light image of the headlamp, as for example for the maintenance of bright-dark limits at low beam , Adaptive high beam, cornering and fog light modules is the case in which the low beam distribution is determined by the position of the light sources with respect to and in connection with a reflector.
    FIG. 6 shows a further measure for the electronic component 1 according to FIG. 5 of counteracting the erroneous position of the light-emitting surfaces 3a, 3b and 3c. For this purpose, the actual quantity Sist comprises information characterizing the dimensions and position of a notional rectangular area R, the dimensions and the position and orientation of the notional rectangle R being selected such that the ratio of coverage and size of the area is optimized. In a simplest variant of this method it can be provided that the rectangle R is determined on the basis of the positions and dimensions of the light emitting surfaces 3a, 3b and 3c of the electronic component 1 according to FIG. 1 and the rectangle R thus obtained is positioned and oriented in this way, the area coverage with the light-emitting areas 3a, 3b and 3c assumes a maximum. The position of the center of gravity and the orientation of the rectangle R can in turn be used to correct the placement position of the electronic component 1.
    The term "characterizing information" which is often used in the context of the claims merely means that suitable quantities or fields are used to identify the relevant information which is suitable for reproducing and unambiguously specifying the information in question.The position and orientation of the notional rectangular area R characterizing information may be given, for example, by a field in which entries for length, width, position and orientation of the rectangle R are given.
    The improvement in the position of the overall center of gravity Sg of the light-emitting surfaces 3a, 3b and 3c is particularly important for high-beam functions or for all other functions in which cut-offs are defined by means of additional auxiliary elements such as diaphragms.
    The exemplary embodiments shown in FIGS. 1 to 6 disclose an electronic component 1 with three light-emitting surfaces 3a, 3b and 3c. The number of light-emitting surfaces may of course differ from the number shown. Likewise, the geometric shape of the light-emitting surfaces may differ from the shapes shown.
    For easier identification of the light-emitting surfaces 3a, 3b and 3c, it may be provided that they are illuminated by an external light source during step a), whereby the contrast of the light-emitting surfaces 3a, 3b and 3c to surrounding surfaces can be improved. This external light source preferably radiates blue light to the light-emitting surfaces 3a, 3b and 3c. Depending on whether a rapid optical detection is essential (for example, for rapid assembly), it can be provided that the wavelength and the intensity of the light emitted by the external light source is selected such that the light-emitting surfaces 3a, 3b and 3c Radiation of light can be stimulated.
    In view of this teaching, the skilled person will be able to arrive at other, not shown embodiments of the invention. The invention is therefore not limited to the embodiments shown. Also, individual aspects of the invention or the embodiments can be picked up and combined with each other. Essential are the ideas underlying the invention, which can be performed by a person skilled in the knowledge of this description in a variety of ways and still remain maintained as such.
    权利要求:
    Claims (15)
    [1]
    claims
    1. A method for the positionally accurate assembly of a circuit carrier (2) with at least one electronic component (1), which at least two separately controllable light-emitting surfaces (3a, 3b, 3c), comprising the following steps: a) optical detection of actual positions b) calculating at least one actual variable (Sist) characterizing the geometric position of the light-emitting surfaces (3a, 3b, 3c) as a function of the actual positions c) comparison of the at least one actual variable (Sist) with at least one desired variable (Ssoii) for calculating at least one correction variable (k), d) loading of the circuit carrier (2) with the at least one electronic component (1) as a function of the at least one correction variable (k).
    [2]
    2. The method according to claim 1, characterized in that the actual size (Sist) and the target size (Ssoii) is supplied to or recorded by a digital arithmetic unit in which the correction quantity (k) is calculated, wherein the correction quantity (k) be passed as a digital information signal to a loading device for placement in accordance with step d).
    [3]
    3. The method according to claim 1 or 2, characterized in that the correction variable (k) comprises at least one vector size, wherein the direction of the vector size is oriented parallel to the mounting surface of the circuit substrate (2).
    [4]
    4. The method according to claim 3, characterized in that the correction variable (k) also comprises an angle for rotation about a rotation axis (z), wherein the rotation axis is oriented orthogonal to the mounting surface of the circuit substrate (2).
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the at least one actual variable (Sist) comprises a course, in particular the inclination, the visible edges of the light-emitting surfaces (3a, 3b, 3c) characterizing information.
    [6]
    6. The method according to any one of claims 1 to 4, characterized in that the at least one actual size (Sist) comprises a virtual center of gravity (Sg) of the light-emitting surfaces (3a, 3b, 3c) characterizing information, wherein the virtual center of gravity ( Sg) by determining the geometric centers of gravity (Si, S2, S2) of the individual light-emitting surfaces (3a, 3b, 3c) is determined taking into account their actual positions.
    [7]
    7. The method according to any one of claims 1 to 4, characterized in that the at least one actual size (Sist) comprises a characterizing the dimensions and position of a notional rectangular area information, wherein the dimensions and the position and orientation of the fictitious rectangle (R) is chosen so that the ratio of coverage and size of the area is optimized.
    [8]
    8. The method according to any one of claims 1 to 7, characterized in that the desired size (Ssoii) comprises a position indication with respect to a reference point, wherein the reference point on the electronic component (1) or the circuit carrier (2) of the electronic component (1 ) is arranged.
    [9]
    9. The method according to any one of claims 1 to 8, characterized in that the light emitting surfaces (3a, 3b, 3c) are spaced from each other.
    [10]
    10. The method according to any one of claims 1 to 9, characterized in that the at least one electronic component (1) has a plurality of at least three, four or five light-emitting surfaces (3a, 3b, 3c), which are preferably arranged in a row ,
    [11]
    11. The method according to any one of claims 1 to 10, characterized in that the electronic component (1) is an LED, preferably an SMD LED.
    [12]
    12. The method according to any one of claims 1 to 11, characterized in that the light emitting surfaces (3a, 3b, 3c) during step a) are illuminated by an external light source.
    [13]
    13. The method according to any one of claims 1 to 12, characterized in that the light-emitting surfaces (3a, 3b, 3c) are excited during the step a) for the emission of light.
    [14]
    14. Circuit carrier (2) with at least one electronic component (1), wherein the electronic component (1) at least two separately controllable light-emitting surfaces (3a, 3b, 3c), characterized in that equipping the circuit carrier (2) with the at least one electronic component (1) as a function of the actual positions of the at least two light-emitting surfaces (3a, 3b, 3c) of the electronic component (1) according to a method according to one of the preceding claims.
    [15]
    15. Motor vehicle headlight with a circuit carrier (2) according to claim 14.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50469/2015A|AT517259B1|2015-06-09|2015-06-09|Process for the exact placement of a circuit carrier|ATA50469/2015A| AT517259B1|2015-06-09|2015-06-09|Process for the exact placement of a circuit carrier|
    US15/579,663| US9992920B1|2015-06-09|2016-06-02|Method for accurate population of a circuit carrier|
    CN201680033511.0A| CN107873140B|2015-06-09|2016-06-02|Method for the positionally accurate assembly of a circuit carrier|
    EP16728605.3A| EP3308615B1|2015-06-09|2016-06-02|Method for accurately populating a circuit carrier|
    JP2017564051A| JP6571211B2|2015-06-09|2016-06-02|Method for positionally accurate mounting of circuit supports|
    PCT/AT2016/050173| WO2016197166A1|2015-06-09|2016-06-02|Method for accurate population of a circuit carrier|
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