WO1997029914A1 - Commutateur optique et imprimante a jet d'encre - Google Patents

Commutateur optique et imprimante a jet d'encre Download PDF

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Publication number
WO1997029914A1
WO1997029914A1 PCT/JP1997/000384 JP9700384W WO9729914A1 WO 1997029914 A1 WO1997029914 A1 WO 1997029914A1 JP 9700384 W JP9700384 W JP 9700384W WO 9729914 A1 WO9729914 A1 WO 9729914A1
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WO
WIPO (PCT)
Prior art keywords
ink
electrode
photoconductor
piezoelectric element
optical
Prior art date
Application number
PCT/JP1997/000384
Other languages
English (en)
Japanese (ja)
Inventor
Masatoshi Kimura
Masao Hiyane
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to DE19780213T priority Critical patent/DE19780213T1/de
Priority to JP9529188A priority patent/JP3030787B2/ja
Publication of WO1997029914A1 publication Critical patent/WO1997029914A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/08—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof in which radiation controls flow of current through the device, e.g. photoresistors

Definitions

  • the present invention relates to an optical switch using a capacitance object such as a piezoelectric element and a photoconductor, and to an ink jet printer using such an optical switch.
  • the present invention can be conveniently applied to achieve a high-speed driving and high-density switch structure.
  • the inkjet printer which is rapidly developing as a personal printer, is not an exception.
  • it is necessary to reduce the pitch between the nozzles for the ink jet.
  • the limit is to limit the nozzle arrangement interval to several lines per square meter, and especially the narrowing of the pitch at the connection between the ink injection pump and the starting circuit is already limited. Has been reached.
  • Japanese Patent Application Laid-Open No. Sho 61-29343 discloses a conventional technique for controlling the driving state of a piezoelectric element by irradiating a photoconductor with light. This is related to an ultrasonic probe that transmits and receives ultrasonic signals, and has a structure in which a photoconductor is directly provided on one side of a piezoelectric element, and a transparent electrode is provided thereon, so that a light beam emitted from the transparent conductor side is emitted.
  • the operating area of the piezoelectric element and the sensitivity (resistance) of the photoconductor are controlled, and when the piezoelectric element receives ultrasonic waves, the output of the piezoelectric element receiving the ultrasonic waves The voltage is taken out as an analog value.
  • a recording element is formed of a photoconductive element in a piezoelectric element that deforms a pressure chamber of an ink nozzle, a recording electrode provided in the nozzle, and a counter electrode provided corresponding to the recording electrode.
  • a high voltage is applied to the ink by forming a meniscus of the ink with the piezoelectric element, applying a voltage between the nozzle surface and the recording electrode, and irradiating the photoconductor provided on the nozzle surface with light.
  • electric charges are injected into the ink at the generated high voltage, and at the same time, the ink starts flying at the high charge level. Disclosure of the invention
  • the present invention provides an ink jet printer device which realizes the four problems (1) to (4) described above, namely, wiring of a fine pattern, a large number of individual drive circuits, suppression of high voltage, and low cost.
  • the task is to provide.
  • Another object of the present invention is to provide an optical switch which can be suitably used for driving an ink jetting mechanism of a head in an ink jet printer according to the present invention.
  • the present invention uses a photoconductor as a driving circuit for a piezoelectric element, and irradiates the photoconductor with light according to a signal pattern, thereby varying the voltage between both ends of the piezoelectric element (capacitance object).
  • a light switch characterized by An optical multi-switch is provided by providing a switch and a plurality of nozzles for ejecting ink by mechanical displacement of the piezoelectric element, and providing individual photoconductors for each piezoelectric element.
  • the optical switch of the present invention can switch the charging or discharging of the capacitance object (piezoelectric element) by irradiating the photoconductor connected to the capacitance object with light.
  • the feature is that it is performed by using the
  • the capacitance object has a pair of electrodes, one of which is formed by the photoconductor, and the other of which is grounded.
  • the photoconductor has a first side connected to one electrode of the capacitive object, and a second side opposite to the first side, and the second side is a transparent conductor.
  • the signal of the electric circuit connected to the transparent conductor is transmitted to the capacitance object by an optical switching effect of the photoconductor.
  • One electrode of the capacitance object is a good conductor electrode, the photoconductor is bonded to the good conductor electrode, and a side of the photoconductor opposite to the good conductor electrode is formed of a transparent conductor. A signal of an electric circuit connected to the transparent conductor is transmitted to the capacitance object by an optical switching effect of the photoconductor.
  • the capacitance object is composed of a piezoelectric body, and the piezoelectric body is deformed by a signal transmitted to the piezoelectric body by an optical switching effect of the photoconductor. It is desirable to extract mechanical output.
  • the optical multi-switch of the present invention includes a plurality of capacitance objects (piezoelectric elements), and one electrode of each capacitance object is independently illuminated.
  • the other electrode of each capacitance object is connected to the conductor, and the other electrode of the adjacent capacitance object is connected to the other electrode of the adjacent capacitance object, and performs switching of charging or discharging of each capacitance object.
  • the method is characterized by performing the light switch effect by irradiating each photoconductor with light.
  • a plurality of ink jetting mechanisms using piezoelectric materials are arranged in parallel, and one electrode of each piezoelectric material is connected to each other. Independently connected to the photoconductor, and the other electrode of each piezoelectric body is connected to the other electrode of the adjacent piezoelectric body, and the light scanning means selectively irradiates the plurality of photoconductors with light.
  • the ink is ejected from the ink ejecting mechanism by deforming the corresponding piezoelectric body.
  • a laser optical system such as a laser light source, a rotating mirror or a vibrating mirror, and acoustic deflection can be used.
  • a photosensitive layer is connected to the piezoelectric element of an image forming apparatus including an ink supply path, an ink pressure chamber, an ink nozzle, and a piezoelectric element, and the photosensitive layer is irradiated with light according to an image pattern. Accordingly, in an ink jet printer using an optical switch, the piezoelectric element is deformed and the piezoelectric element is ejected from the ink nozzle by mechanical fluctuation.
  • a switch circuit is connected between one electrode and the other electrode of the piezoelectric element, and a voltage having a polarity such that the photosensitive member can respond to light is applied to the photosensitive layer (5).
  • a printer device characterized by the following is provided.
  • the ink pressure chamber When a voltage of approximately 0 V is applied to the piezoelectric element, the ink pressure chamber expands, absorbs ink from the ink supply path, and is applied to the photosensitive element to the photosensitive layer. When a high voltage is applied, the ink pressure chamber may be configured to contract.
  • the ink pressure chamber expands, absorbs ink from the ink supply path, and conversely, when the high voltage applied to the photosensitive layer is applied to the piezoelectric element, the ink chamber shrinks. It can also be configured.
  • FIG. 1 is a configuration diagram schematically showing an inkjet nozzle of the present invention.
  • FIG. 2 is a principle view of an ink jet nozzle using the optical switch of the present invention.
  • FIG. 3 shows a specific configuration example of the ink jet nozzle of the present invention.
  • FIGS. 4 (a) and 4 (b) are diagrams for explaining a method of forming a diode 7 used in an ink jet head using the optical switch of the present invention.
  • Figure 5 shows a multiplexed circuit configuration that includes a piezoelectric element, a photoconductor film, and a diode.
  • Figure 6 shows the overall configuration of the ink jet printer.
  • Figure 7 is a schematic diagram of the print head.
  • FIG. 8 shows a configuration example of the optical switch of the present invention.
  • FIG. 9 shows another example of the configuration of the optical switch of the present invention.
  • FIG. 1 shows a configuration of an ink jet nozzle to which the present invention is applied.
  • 1 is a nozzle plate
  • 2 is an ink pressure chamber
  • 3 is a piezoelectric element, which is configured as a piezoelectric injection device.
  • the piezoelectric element 3 is a part of the inner wall of the ink pressure chamber 2, for example, the upper wall as shown in the figure. Is formed.
  • the pressure chamber 2 contracts, so that pressure is applied to the ink in the pressure chamber 2 Image recording by ejecting ink droplets through the nozzle holes 1 a of the nozzle plate 1.
  • the piezoelectric element 3 is deformed from the solid line position in FIG. 1 to the broken line position, the pressure chamber 2 expands, and the ink is absorbed into the pressure chamber 2. I do.
  • the piezoelectric element 3 contracts the pressure chamber 2 when applying a voltage, that is, when charging, ejects ink droplets, and expands the pressure chamber 2 during discharge to absorb ink in the pressure chamber 2.
  • a voltage that is, when charging, ejects ink droplets
  • the pressure chamber 2 expands to absorb ink into the pressure chamber 2
  • discharging contracts the pressure chamber 2 to cause ink drop. May be deformed so as to inject water.
  • FIG. 2 is a diagram illustrating the principle of the ink jet printer of the present invention.
  • FIG. 3 is a perspective view thereof.
  • reference numeral 4 denotes a conductive film individually connected to each piezoelectric element 3
  • 5 denotes a photoconductor layer individually formed on each conductive film 4
  • 6 denotes an individual photoconductor layer 5
  • a common high-voltage circuit connected to the other surface 7 is a diode individually connected to each photoconductor layer 5
  • 8 is a ground short circuit (commonly provided for each diode 7).
  • 9) is a common ink supply path
  • 10 is a platen
  • 11 is a print medium
  • 12 is a scanning light.
  • Reference numeral 13 denotes a transparent conductive film.
  • a plurality of pressure chambers 2 are arranged in the line direction with respect to the platen 10.
  • the nozzle plate 1 has a nozzle hole 1a corresponding to each pressure chamber 2.
  • the common ink supply passage 9 communicates with the individual pressure chambers 2 via the communication holes 9a.
  • each piezoelectric element 3 is connected to one (upper) surface of an individual photoconductor eyebrow 5 via an individual conductive film 4.
  • Individual One (upper) surface of the photoconductor layer 5 is connected to an individual diode 7 and the other (lower) surface is connected to a common high-voltage circuit 6.
  • the electrodes on the other (lower) surface of the individual piezoelectric element 3 are connected to a common ground (switch) 8.
  • the individual photoconductor layer 5 is selectively irradiated with the scanning light 12 of the laser beam via the transparent conductive film 13 o
  • the present invention by realizing a large number of drive circuit elements by the photoconductor layer 5 individually connected to the piezoelectric element 3, it is possible to increase the density and reduce the cost. Further, the control of the high voltage applied to the piezoelectric element 3 can be easily handled by applying the optical switching by the photoconductor layer 5.
  • FIGS. 4 (a) and 4 (b) are diagrams for explaining a method of forming a diode 7 used in an ink jet head using the optical switch of the present invention.
  • an N-type silicon substrate 71 is prepared.
  • the surface of the single crystal of the N-type silicon substrate 71 is heated and oxidized to form a silicon oxide film (SiO 2 film).
  • This SiO 2 film functions as a single-crystal protective film and at the same time acts to prevent diffusion of the doping agent.
  • a photosensitive chemical substance (not shown) called a photo resist is applied on the SiO 2 film, and ultraviolet rays are irradiated through a mask (not shown).
  • the SiO 2 film is removed only in the region where the P-type diffusion layer is to be formed.
  • boron is diffused in an oxidizing atmosphere to form a P-type region 73.
  • a SiO 2 film is formed on the surface.
  • the oxide film in the portions corresponding to the electrode portions is removed, and aluminum is formed by vapor deposition on the portions from which these oxide films have been removed, to form electrodes 74 and 75.
  • the SiO 2 film 72 as a protective film remains in portions other than the electrode forming portion.
  • Figure 5 shows a multi-circuit configuration.
  • the piezoelectric element 3, the photoconductive film 5, and the diode 7 are provided for each ink jet nozzle. Is provided.
  • One electrode of each piezoelectric element 3 (1 to n) is connected to one side of a separate photoconductor layer 5 (1 to n), and each connection portion is connected to one of the individual diodes 7.
  • the other side of each diode 7 is commonly connected and connected to the ground via a common ground switch 8.
  • the other sides of the individual photoconductor layers 5 (1 to n) are connected in common and connected to a high-voltage circuit (6).
  • each of the photoconductor layers 5 (1 to! 1) is selectively driven by light irradiation.
  • FIG. 6 is an overall configuration diagram of an ink jet printer that drives nozzles using the optical switch of the present invention
  • FIG. 7 is a schematic diagram of a print head.
  • 20 is a print head
  • 10 is a platen
  • 11 is paper
  • 24 is a paper cassette
  • 25 is paper staple force
  • 30 is a control unit.
  • 21 is an LED array
  • 22 is a self-optical lens
  • 23 is a circuit board. As shown, the structure of the pressure chamber 2 and the multi-circuit configuration shown in FIG.
  • An LED array 21, a self-occurring lens 22, and a circuit board 23 are mounted on a print head 20, and a control unit 30 including a common ground switch 8 is provided on the side of the printer body.
  • the paper 11 is supplied from the paper cassette 24 to the platen 10, and printing is performed on the paper 11 on the platen 10 by the ink jet printing head 20.
  • the printed paper 11 is accumulated on the paper stat force 25.
  • the LED array 21 is arranged in parallel to the arrangement direction of the nozzles 1 a, and can selectively irradiate light to the photoconductor layer 5 corresponding to a specific nozzle via the self-ox lens 22.
  • FIG. 2 the operation principle of the ink jet printer according to the present invention will be described with reference to FIGS. 2, 3, and 5 to 7.
  • FIG. 2 the operation principle of the ink jet printer according to the present invention will be described with reference to FIGS. 2, 3, and 5 to 7.
  • the common ground short circuit 8 is closed (that is, ) And short circuit all circuits. Then, by the action of the diode 7, the surface potential of the upper part of the photoconductor layer 5, that is, the piezoelectric element 3 becomes 0 V. At this time, the piezoelectric element 3 is set so that the pressure chamber 2 expands.
  • the light beam 12 is scanned in accordance with the image signal pattern, and the individual photoconductor layers 5 are selectively irradiated with light via the transparent conductive film 13 (FIG. 3) to selectively irradiate the light.
  • the power supply voltage of the common high-voltage circuit 6 also appears on the opposite side of the photoconductor layer 5 (that is, the upper surface of the photoconductor layer 5), and this potential is transmitted via the conductive film 4 to the piezoelectric body.
  • element 3 Applied to element 3.
  • the piezoelectric element 3 is deformed and the pressure chamber 2 is compressed. As a result, ink droplets are ejected from the compression chamber 2 through the nozzle holes la.
  • the common earth short circuit is closed again (that is, turned on), and since the surface potential of the piezoelectric element 3 that has ejected the ink is higher than the earth potential, the piezoelectric element 3 is discharged through the diode 7 and discharged. The surface of the body element 3 is set to the 0 V potential again. Then, the piezoelectric element 3 expands again in the direction in which the pressure chamber 2 expands, and ink is supplied from the common ink supply path 9 to the pressure chamber 2 via the individual communication holes 9a. In this way, all the piezoelectric elements 3 become 0 V potential and return to the initial state. That is, the pressure chamber 2 is filled with ink.
  • the irradiation of the light beam 12 causes the pressure chamber 2 of the ink to contract and eject the ink.
  • the photoconductor layer is formed. 5 irradiates light, the pressure chamber 2 expands and sucks ink, and a voltage of 0 V is applied to the piezoelectric element 3. Conversely, when the pressure is applied, the pressure chamber 2 is contracted so that ink can be injected.
  • the present invention a large number of drive circuit elements are realized by the photoconductor layer 5 individually connected to the piezoelectric element 3, thereby enabling a reduction in cost. Furthermore, since the voltage is controlled by applying the optical switching by the photoconductor layer 5, the high voltage to be applied to the piezoelectric element 3 can be easily controlled.
  • the ON / OFF ratio of the photoconductor is high, and second, that the ON resistance is small and no residual voltage remains. Is done.
  • the characteristics of currently known inorganic photoconductor films are as follows.
  • Mobility / 10- 5 ⁇ l (T 7 cm 2 / Vs 0. l ⁇ 10cm 2 / Vs ⁇ 0. LcmVVs carrier lifetime Te ⁇ 1 s 10- 5 s 10 " 6 s
  • an injection ink amount lOOpl can be obtained. This value is the required ink amount at 240dpi.
  • the electrical energy once stored in this piezoelectric element is 3.2 ⁇ J from 1Z2QV. Since particle velocity of the injected Lee ink particles is about 8 s, the injection I link is Mochisa ivy kinetic energy is calculated from 1/2 m V 2, about 4 X 10- 4 jtz J, and the stored energy It is about 1/10000. That is, even if ink is ejected, the energy once accumulated in the piezoelectric element remains almost completely.
  • the capacitance of the piezoelectric element becomes 26 pFF.
  • the area becomes It can be reduced by about an order of magnitude to 0.16 times. This is because, as can be understood from Figs. 1 to 3, in the piezo type, the area of the piezoelectric element 3 is designed to restrict the adjacent pitch, and therefore, the area of the piezoelectric element 3 can be reduced. ⁇ ⁇ ⁇ It turns out that it is extremely effective in reducing the size of the nozzle.
  • the piezoelectric element can be driven by a high voltage without using a driving driver. It is advantageous for
  • the optical carrier generated in the photoconductor (photoconductor) must pass through the photoconductor within at least 6 ms.
  • a photoconductor that satisfies this condition is an a-Si or Se photoconductor. Note that the 0PC, only the photosensitive member having 10- 5 ⁇ 10 6 cm 2 ZVs more mobility becomes applicable.
  • the amount of charge stored in the piezoelectric element is 13 nC at 500 V. This means that the number of electrons is 8.125X10 1 °.
  • the photon Nerugi one becomes 2.76 X 10- 1 9 J. Now, assuming that the light conversion efficiency of the photoreceptor is 100%, the required energy is
  • the light energy per unit time is 16.6mW.
  • this can be achieved by using a semiconductor laser with a power of about 30 mW that has about twice the optical output.
  • Wavelength 720nm semiconductor laser
  • the photoconductor that is, the photoconductor layer 5
  • the charge resistance of the piezoelectric element 26pF it is necessary to discharge the charge accumulated in the piezoelectric element 26pF in at least one line scanning time of 6 ms. is there. That is, from the time constant of CR, the resistance R of the photoconductor is
  • the resistance of the a-Si photoreceptor is about 10 7 ⁇ cm, and the required area S of the photoreceptor is
  • an area of about 100 mC] is sufficient. Also, in this area, if the required LD light amount is provided, the required irradiation light amount is
  • This value is about three orders of magnitude greater than the half-life exposure energy of a normal photoreceptor.
  • FIGS. 8 and 9 two types as shown in FIGS. 8 and 9 can be considered. 8 and 9, members corresponding to those in FIGS. 1 to 7 are denoted by the same reference numerals. That is, 3 is a piezoelectric element (capacitance), 4 is a good conductor, 5 is a photoconductor, 6 is a high-voltage circuit, 8 is a ground switch, 12 is a light beam (electric signal), and 13 is a transparent conductive film ( Electrodes) and 15 are electrodes.
  • 3 is a piezoelectric element (capacitance)
  • 4 is a good conductor
  • 5 is a photoconductor
  • 6 is a high-voltage circuit
  • 8 is a ground switch
  • 12 is a light beam (electric signal)
  • 13 is a transparent conductive film
  • Electrodes Electrodes
  • FIG. 8 shows the capacitance, that is, the photoconductor layer 5 formed on the piezoelectric element 3—a body type.
  • the switch 8 is short-circuited, and the voltage applied to the piezoelectric element 3 is substantially reduced. Set to 0 V. 2)
  • switch 8 is opened.
  • 3) Light irradiation is performed from the transparent electrode 13 side of the photoconductor 5 according to the electric signal.
  • an optical carrier is generated only at the place where light is irradiated, the voltage applied to the transparent electrode 13 is applied to the good conductor 4, the voltage is applied to the piezoelectric element 3, and the piezoelectric element 3 outputs mechanical displacement. become.
  • switch 8 is shorted first, and the above operation is repeated.
  • an optical switch is configured.
  • FIG. 9 shows the capacitance, that is, the photoconductive layer 5 formed directly on the piezoelectric element 3. Rather, the photoconductive layer 5 is formed at a position separated from the photoconductive layer 5 via the good conductor 4, and the operation principle is the same as that of the example of FIG.
  • the advantage of FIG. 9 is that the size of the photoconductor (photoconductor) 5 in the optical switch portion can be any configuration without being limited to the size of the piezoelectric element 3.
  • the nozzle plate indicated by 1 is composed of a SUS multilayer plate.
  • 3 is a stacked piezoelectric element o
  • the photoconductor layer 5 is formed by applying a strip-shaped mask pattern on the PET film having a thickness of 100 ⁇ m so as to correspond to the cuts of each piezoelectric element, and then applying the transparent conductive film I T0. It is formed by vapor deposition. Next, a mask pattern in which a mask is opened only at a portion where a photosensitive layer is to be formed is attached, and a single-layer a-Si photosensitive member layer is formed by vacuum evaporation. Further, a conductive dry film is stuck on the photoreceptor film, and a substrate is stacked thereon. On the other hand, an individual diode 7 and a common electrode are formed on the Si substrate at a position remote from the ink jet substrate. Thereafter, the I T0 portion of the transparent conductive layer 13 and the electrode portion of the diode 7 are bonded with a conductive material. In this way, a multi-nozzle head as shown in FIGS. 1 to 3 was created.
  • the operation principle of the ink jet nozzle according to the embodiment of the present invention is as follows.
  • the high voltage circuit 6 does not supply the piezoelectric body 3 with a voltage in a direction in which the pressure chamber 2 expands.
  • the light beam 12 is scanned to selectively activate the photoconductive film 5 and supply electric charges to the piezoelectric body 3.
  • the selected piezoelectric body 3 deforms and sucks ink into the pressure chamber 3
  • the unit not selected by the optical scanning is also coupled with the capacitor, so that a voltage is applied to the piezoelectric body 3 in the step 1, but the dielectric constant of the photoconductor 5 becomes 11 Since the dielectric constant of 3 has a difference of 2 digits or more from 1800 to 4600, if the area is the same and the thickness is the same, most of the voltage is received by the capacitor of the photoconductor film 5 and the value of 1 to 100 or less Only the voltage is applied to the piezoelectric body 3, and the design conditions of the thickness and the area are not affected by this problem.
  • ink suction is selected by an optical switch so that an organic photoreceptor which can be constructed at a low cost is selected.
  • an a-Si photoconductor or a Se photoconductor which is faster than the above, it is also possible to select on the ejection side.
  • optical switching can be performed on the ink jetting side.
  • Piezo element capacitance 26pF 13nC electrostatic storage capacity at 500V drive voltage
  • Table 5 shows the results. As basic conditions, the required maximum ink response speed is 100 s or less, and the resolution is 600 dpi.
  • the optical switching element and the ink jet head are configured one-to-one. This eliminates the need for a drive driver having a high drive voltage with respect to the piezo element of the ink jet as in the past. A simpler configuration can be achieved using mirrors and line LEDs, which is advantageous for economy and miniaturization.

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

On améliore la vitesse et la résolution d'impression d'une imprimante à jet d'encre en amincissant le circuit de câblage et en augmentant le nombre de circuits de commande individuels nécessaires pour obtenir une tête de ligne, tout en évitant le fonctionnement à haute tension et l'augmentation du coût de l'imprimante. Celle-ci est configurée de façon que les mécanismes d'éjection de l'encre utilisant des corps piézo-électriques (3) soient disposés en parallèle et qu'une des électrodes de ces derniers (3) soit indépendamment reliée aux photoconducteurs, tandis que les autres électrodes sont reliées aux autres électrodes des corps adjacents (3). Les mécanismes d'éjection de l'encre éjectent de l'encre grâce à la déformation d'un des corps piézo-électriques (3) par irradiation sélective du photoconducteur correspondant (5) à l'aide d'une lumière (12) émise par un dispositif de balayage optique. L'imprimante utilise un commutateur optique.
PCT/JP1997/000384 1996-02-16 1997-02-13 Commutateur optique et imprimante a jet d'encre WO1997029914A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19780213T DE19780213T1 (de) 1996-02-16 1997-02-13 Optischer Schalter und Tintenstrahldrucker
JP9529188A JP3030787B2 (ja) 1996-02-16 1997-02-13 光スイッチ及びインクジェット式プリンタ

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JP2959596 1996-02-16
JP8/29595 1996-02-16

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WO1997029914A1 true WO1997029914A1 (fr) 1997-08-21

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1369240A2 (fr) * 2002-06-07 2003-12-10 Hewlett-Packard Development Company, L.P. Système d'émission de fluide et de balayage avec activation des éléments d'éjection par photodétecteurs
EP1369239A1 (fr) * 2002-06-07 2003-12-10 Hewlett-Packard Development Company, L.P. Activation par photodetecteur d'un élement d'éjection d'un appareil d'éjection de fluide
US6747684B2 (en) 2002-04-10 2004-06-08 Hewlett-Packard Development Company, L.P. Laser triggered inkjet firing
US7083250B2 (en) 2002-06-07 2006-08-01 Hewlett-Packard Development Company, L.P. Fluid ejection and scanning assembly with photosensor activation of ejection elements
US7104623B2 (en) 2002-06-07 2006-09-12 Hewlett-Packard Development Company, L.P. Fluid ejection system with photosensor activation of ejection element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54156634A (en) * 1978-05-31 1979-12-10 Fujitsu Ltd Ink jet recording head
JPS6179664A (ja) * 1984-09-28 1986-04-23 Toshiba Corp インクジエツト記録装置
JPH0664166A (ja) * 1992-08-14 1994-03-08 Citizen Watch Co Ltd インクジェットヘッドの駆動方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54156634A (en) * 1978-05-31 1979-12-10 Fujitsu Ltd Ink jet recording head
JPS6179664A (ja) * 1984-09-28 1986-04-23 Toshiba Corp インクジエツト記録装置
JPH0664166A (ja) * 1992-08-14 1994-03-08 Citizen Watch Co Ltd インクジェットヘッドの駆動方法

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6747684B2 (en) 2002-04-10 2004-06-08 Hewlett-Packard Development Company, L.P. Laser triggered inkjet firing
EP1369240A2 (fr) * 2002-06-07 2003-12-10 Hewlett-Packard Development Company, L.P. Système d'émission de fluide et de balayage avec activation des éléments d'éjection par photodétecteurs
EP1369239A1 (fr) * 2002-06-07 2003-12-10 Hewlett-Packard Development Company, L.P. Activation par photodetecteur d'un élement d'éjection d'un appareil d'éjection de fluide
US6705701B2 (en) 2002-06-07 2004-03-16 Hewlett-Packard Development Company, L.P. Fluid ejection and scanning system with photosensor activation of ejection elements
EP1369240A3 (fr) * 2002-06-07 2004-06-09 Hewlett-Packard Development Company, L.P. Système d'émission de fluide et de balayage avec activation des éléments d'éjection par photodétecteurs
US6799819B2 (en) 2002-06-07 2004-10-05 Hewlett-Packard Development Company, L.P. Photosensor activation of an ejection element of a fluid ejection device
US6893113B2 (en) 2002-06-07 2005-05-17 Hewlett-Packard Development Company, L.P. Fluid ejection and scanning system with photosensor activation of ejection elements
US7083250B2 (en) 2002-06-07 2006-08-01 Hewlett-Packard Development Company, L.P. Fluid ejection and scanning assembly with photosensor activation of ejection elements
US7104623B2 (en) 2002-06-07 2006-09-12 Hewlett-Packard Development Company, L.P. Fluid ejection system with photosensor activation of ejection element

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