• 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 and apparatus for use in an ink jet printing device to synchronously produce a plurality of uniform fluid filaments and droplets. A fluid reservoir is provided with an orifice plate having a plurality of orifices through which the fluid issues to produce the desired filaments and droplets. The top of the reservoir consists of a flexible pressure plate which can be flexed in a transverse bending motion by a plurality of electroacoustic transducers suspended above the pressure plate so as to produce substantially uniform pressure waves in the fluid over the plurality of orifices.
    公开号:SU878211A3
    申请号:SU782649251
    申请日:1978-07-18
    公开日:1981-10-30
    发明作者:Л.Ча Чарльз
    申请人:Дзе Мэд Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    They are deposited in the wrong positions on the roll. Therefore, these devices cannot operate at maximum performance if droplets in all the streams are not generated synchronously with the transmitted charged pulses associated with them. This, in turn, requires either timing the generation of droplets from each and every monofilament, or controlling the generation of droplets in such a way that the time or phase of generating the droplets are known in advance. Thus, it is necessary to apply disturbingly to the stimulation of droplets to all monofilaments with a common amplitude and in a synchronized manner. In the aforementioned device, droplet generation occurs by the traveling wave method. This method has limitations both in terms of print width and print quality. A series of traveling waves propagates along the length of the plate with holes, and jets are stimulated as they emerge. However, wave propagation is accompanied by energy dissipation, which causes a constant elongation of the monofilaments of the jets along the array. Sometimes, the lengths of the monofilaments become excessive and the maximum useful printing width is reached. The reason for limiting the above method is the insufficient print quality, since in this system different jets do not generate drops at the same time, and there is a known phase relationship between them. Thus, the system can theoretically work with the best resolution, but each channel must be equipped with a phase shift circuit, which requires a large amount of electronic equipment and in practice is difficult to achieve due to different oscillation of the wavelength of the plate and therefore due to an error in the phases, which is caused by inhomogeneous plate boundaries with strands. Even in such a case, if such synchronization is achieved, there is no place for better printing quality due to the fact that the square matrix of droplets cannot be formed by a traveling wave. Thus, such systems work with one fifth or one fourth of the maximum theoretical resolution. It is also known a device for forming droplets in which uniform monofilaments and droplets in a number of jets are simultaneously generated. This device uses hole plates located in the lower part of the ink reservoir. The pressure changes by injecting ink from the holes are induced by a flexible plate located at a distance from the surface of the plate with holes, but within the ink tank 2}. A plurality of electrical signal transducers in the movement of piezoelectric transducers are mounted on the top of the plate, so that when simultaneously energized, they create transverse bending along the length of the plate, creating uniform pressure distribution in the fluid over the holes and this uniformity in size of monofilaments and droplets is created leaving them out of the holes. However, in such a device it is necessary to install a significant number of piezoelectric transducers, which leads to the complexity of the design. Another disadvantage is the formation of a slot at each end of the plate, since the plate under pressure is located within the reservoir itself, i.e. located on both sides of the plate. This causes the top plate to vibrate, bending back and forth. However, this results in the formation of secondary waves in the fluid passing through the aperture. This causes undesirable disturbances in the monofilaments, which reduces the uniformity of the monofilaments and the size of the droplets, and impairs the efficiency of energy transfer from the plate under pressure to the holes. The presence of these gaps can cause inhomogeneity of the energy distribution along the plate, as well as weaken the disturbances plate transfer fluids. The purpose of the invention is to improve the quality of the formation of droplet streams by providing uniform droplet formation. The goal is achieved by the fact that in a device for forming streams of liquid droplets in inkjet printing units containing a liquid-filled reservoir whose bottom is a rectangular plate with spinnerers located along the my lines, and the lid, the rectangular elastic plate, and the electrical signal transducers, for example, piezoelectric transducers, connected to the control unit and Equipped with the outer surface of the elastic plate, a support plate is installed on which electrical signal to motion transducers are placed, and damping elements placed between parallel planes of the elastic and support plates, the tank bottom width being less than half the bending wavelength in the specified bottom at maximum working frequency The distance between the roof surfaces and the bottom of the reservoir is a multiple of an odd quarter of the compression wavelength in iron at the operating frequency. The contact width of each transducer with an elastic plate is less than half the bending wavelength in this transducer at the operating frequency. The distance between contact pads on an elastic plate is less than half the length of bending waves in a given plate at an operating frequency. Figure 1 presents the proposed device; figure 2 is the same cross section; FIG. 3 shows a piezoelectric transducer (FIG. 4) is a plate-plate, under pressure, and piezoelectric transducers; Fig. 5 is a diagram illustrating the recommended type. The contact between the piezoelectric transducers and the plate is under pressure. The device comprises a reservoir 1 filled with a liquid, the bottom of which is a rectangular plate 2 with spinnerets 3 arranged in a straight line, and the lid is a rectangle on an elastic plate 4 under pressure. The device also includes transducers 5 of the electric signal into displacement, for example, piezoelectric, connected to the control block b. The tank 1 is in the form of an elongated opening in a rectangular metal block with internal conical side walls 7 and 8 (Fig. 2). Fluid is supplied into the reservoir through the tube 9 at a predetermined pressure and completely filled it. Plate 2 is rigidly attached to the reservoir, and its thickness is selected from the condition that it is not vibrated when the fluid pressure in the reservoir fluctuates. The collector cover is an elastic plate 4, which is sufficiently flexible to deform it perpendicular to its longitudinal axis under the action of converter 5. It is rigidly attached to the edge of tank 1 so that only its part, which is under pressure, can be bent under by the action of the transducers 5. A pair of damping elements 10 and 11 made of relatively elastic material, such as polyurethane, is attached to the upper surface of the plate 4. Transducers, one of which is shown in FIG. 3, for example, are piezoelectric transducers, although other types of electro-acoustic transducers can be used. For example, you can use magnetostrictive transducers, electrodynamic transducers, or electrostatic transducers. Each transducer 5 consists of an upper limiting plate 12, a pair of ceramic transducers of thickness 13 and 14, an installation plate 15, which is an electrode for transducers 13 and 14, elastic elements 16, which are dielectrics, and a force transmission element 17. Each transducer 5 is fastened with a bolt 18, which is the electrode of the transducers 13 to 14. The row of upper limiting plates 12 must have a higher acoustic index than eletant 17 for transmitting the force, in order to increase the transmission force to the plate 4. Element 17 force transducer for each converter can be of various configurations. The resilience of the elements 16 should prevent the occurrence of a traveling wave in the reservoir plate and have a favorable effect on the dropping of the droplets from the holes. The transducers 13 and 14 are driven by the central electrode, i.e. the plates 15 and the bolt 18 by the action of the elements 16, so that a number of converters 5 can be activated simultaneously. As shown in Fig. 4, the transducers are located at equal distances along the longitudinal axis of symmetry of the upper surface of the plate 4, which is under pressure, and their contact pads 19 are separated by a distance from each other. In practice, the distance G is quite important and it should be less than half the length L / 2 of bending waves in fuiacTHHe at the operating frequency. This is necessary in order to further reduce the potential for intensifying standing waves between adjacent and more distant waves. from each other by transducers 5. The same cciMoe requirement relates to the width W of contact of each transducer with an elastic plate, i.e. the width must be substantially less than half the length of the flexural wave in the transducer 5 at the operating frequency. This reduces the possibility of interference from reflected waves or distortions due to these waves within a given transducer. Despite the fact that the transverse size of the converter pad 5, i.e. the width dimension, plate 4, is not as critical as the width W, it is preferable that it is less than half the length of the flexural waves within the limits of the given transducer at the operating frequency. It should be noted that in practice, distance D and width W can be close to half the length of a flexible wave without substantially hindering the uniformity of the energy and, consequently, the uniformity of the length of the monofilaments. Figure 5 shows the recommended position of the contact pads 1. It is necessary that there is a linear contact along the longitudinal axis of the plate-4. However, there may be a point contact or contact over the area of the straight coal section, if this is necessary for an individual variant. To eliminate the permanent connection between the transducers and the plate 4, the support plate 20 is inserted into the device. In the case of broadband stimulating devices, the distance between the bottom surface of the plate 4 and the upper surface of the hole plate 2, i.e. The height H of reservoir 1 for liquid is not critical and can be as small as hydrodynamics allows. For narrowband stimulating devices, it must be a multiple of an odd quarter of the compression wavelength in the liquid at the operating frequency. This ensures the placement of a plate with holes in the nodal plane, in which the amplitude of vibrations of the B mainly fades out. The die plate 2 is stiff. For this, the parameters of the internal walls of the reservoir at the intersection with the upper surface of the plate 2, are generally less than half the length of the bending waves in plate 2 at the maximum operating frequency. This is necessary in order to reduce and minimize the propagation of interfering waves within plate 2. During operation, all transducers 5 are excited at the appropriate frequency to create a uniform drop of light coming out of the nozzles 3. Each transducer is excited by electrical pulses supplied to both elements 13 and 14. Since the transducers are simultaneously energized periodically, they force the transmitting elements 17 | Bend the plate 4 and down along the positions of the dashed lines shown in FIG. Due to the fact that the lower surface of the plate 4 is in contact with the upper surface of the liquid in the reservoir, the compression waves propagate in the liquid and are transmitted to the liquid ejected from the holes, forming uniformly monofilaments and droplets. It is necessary to simultaneously excite all the transducers 5 along the length of the plate 4 at the same time and with equal amplitude. For this purpose, the recommended method of exciting the array of transducers 5 is to work out of resonance, despite the fact that resonant excitation is more efficient and easier to achieve. The reason for this is that, in practice, the resonant frequency of the transducers may be somewhat different due to the oscillation of various physical parameters of the transducer assembly. However, both the amplitude and phase of the oscillations depend on the frequency. When the transducers have a similar, but not exactly the same resonant frequency, they are simultaneously activated at a given frequency, for example, at the resonant frequency of one of the transducers, the other transducers of this array will give signals of different amplitudes at different times that are different. megto for resonantly working converters. The magnitude of the differences depends on the bandwidth of the resonant frequencies: the narrower the band, the greater the difference between the quantities. However, the amplitude of the phase becomes relatively independent of frequency if the transducer is operating outside the resonance, since this causes a more uniform distribution of phases along the surface of the plate 4 due to operation converters at a level above or below their resonant frequency. At such frequencies, a large homogeneity of the amplitude and phase supplied to the device is observed, and, despite the fact that the energy losses are large due to the operation of transducers outside the receiver, this is compensated by the supply of large amounts of energy. However, the advantage achieved with a uniform and synchronous supply of effort, fully compensates for this increased waste of energy. By creating periodic contact between the lower edge of the lower spinnerets 3 and the upper surface of the plates 4. With the aid of plate 20, significant advantages are achieved, since in this case there is no uniformity of adhesive layers for attaching a plurality of transducers to the plate in a known device, periodic contacts allow to create a more uniform energy distribution. In addition, after long periods of use, the converter can be out of order and if the converter is glued to the surface of the plate, it is extremely difficult to replace it. The ability to move the transducers relative to each other or along the longitudinal size of the plate allows for the optimization of this relative position depending on the operating frequency, which is not possible when using firmly connected transducers in a known device.
    Thus, new features of the device allow creating a vibrating cassette of a printing device with acoustic impedance matching, which ensures damping of the harmonics above the first one, and this in turn ensures the frequency of arrival and uniformity of the droplets.
    权利要求:
    Claims (4)
    [1]
    Invention Formula
    I 1. A device for forming streams of liquid droplets in inkjet printing units, comprising a reservoir filled with liquid, the bottom of which is a rectangular plate with spinnerets arranged in a straight line, and the lid is a rectangular elastic plate, and converters of an electrical signal into movement, For example, piezoelectric, connected to the control unit and interfaced with the outer surface of the elastic plate, characterized in that, in order to improve the quality of formation,
    current droplets by providing one. it contains a support plate on which electrical transducers for displacement are placed, and e damping elements placed between parallel planes of an elastic and support plates, the tank bottom width being less than half the length of bending waves at the specified bottom at the maximum operating frequency,
    o
    [2]
    2. The device according to claim 1, about tl and one that the distance between the surface of the hook and the bottom of the tank is a multiple of an odd quarter of the compression wavelength in the liquid at
    5 working frequency.
    [3]
    3. The device according to paragraphs. 1 and 2, characterized in that the width of the contact of each transducer
    with elastic plate less than half
    0 bending wavelength in this pre-. the former at the operating frequency.
    [4]
    4. The device according to claim 3, characterized in that the distance between the contact points on the elastic plate varies half
    5 bending wavelengths in a given plate at an operating frequency,
    Sources of information pinched into account during examination
    1. US Patent 3,739,393,
    0 cl. G 01 D 15/18, published 1973,
    2. US Patent 3,900,162 cl. 239-102, published, 1978 (prototype).
    M
    L
    (rig. 3
    13 19 - J9 19 j (put, 5
    类似技术:
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    同族专利:
    公开号 | 公开日
    JPS5421844A|1979-02-19|
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    FR2397886B1|1984-12-14|
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    引用文献:
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    EP0097413B1|1982-06-21|1986-06-18|EASTMAN KODAK COMPANY |A fluid jet print head, and a method of stimulating the break up of a fluid stream emanating therefrom|
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    US4587528A|1983-05-19|1986-05-06|The Mead Corporation|Fluid jet print head having resonant cavity|
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    JPH062412B2|1983-08-31|1994-01-12|キヤノン株式会社|Inkjet recording device|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/816,607|US4095232A|1977-07-18|1977-07-18|Apparatus for producing multiple uniform fluid filaments and drops|
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