JPH0351133A - Image recording by exposure to light - Google Patents

Abstract

PURPOSE:To perform linear recording with a high pixel density in a lateral direction using a small number of mechanical elements and a simple device structure by applying a voltage of specified polarity between a light transmissible electrode and a counter electrode, and irradiating a photoelectric charge generation layer with a light corresponding to an image to be recorded. CONSTITUTION:Image forming particles in a developing liquid are attracted by a charge trapping layer 4 by applying a voltage of specified polarity between a light transmissible electrode 2 and an counter electrode 7. Then a light corresponding to an image to be recorded is emitted to a photoelectric charge generation layer 3 and thereby an electric charge of the same polarity as the polarity + of the light transmissible electrode 2 corresponding to the image in a lateral direction is formed. Next the image forming particle is trapped so that it corresponds to the image by moving the charge through the charge trapping layer 4. After this, a voltage of a reverse polarity to a specified polarity is applied to an area between the light transmissible electrode 2 and the counter electrode 7 within the range of a voltage which forms and electric field not exceeding the limits of an electric field working on a space between the charge and the image forming particle in the trap. Next a liquid is ejected from a flow path 8a through a slit 8 while untrapped image forming particle is attracted by the counter electrode 7. Thus high-density dot recording is performed in a recording line direction.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a visible medium ejection type recording method similar to inkjet recording in one aspect, and to a photoreceptor exposure type recording method in another aspect. [Prior Art] In a charge deflection type inkjet recording device, a charge ff1tJi is disposed between an ink ejection nozzle and a deflection electrode, and a charge l! A charging voltage is applied to the electrodes. Due to the electric field between the charged electrode and the ink in the head. Charges of opposite polarity to the charged electrode polarity are concentrated at the leading edge of the ink protruding from the ink jet nozzle, and when the protruding ink is separated into particles, the ink particles carry only charges of the opposite polarity (charging). The charged ink droplets are deflected by a deflection fI1.
While passing between the poles, it is deflected by a deflection electric field. For example, uncharged or low-level charged ink particles collide with the gutter and are collected in the ink tank, and ink particles charged to a predetermined level or higher pass outside the gutter and collide with the recording paper (note #1). An electric field suction type ink recording device has a minute slit with a length corresponding to the width of the recording paper (for example, 210 mm), and this slit communicates with an ink reservoir in the head, and is filled with ink. However, since the slit width is minute, ink does not flow out from the slit. A multi-stylus (pixel recorder weight tri) is facing with this slit and the recording paper in between.
When a relatively high voltage is applied between the 11 poles (between the single electrodes), the ink in the part of the slit that faces the needle electrode is attracted to the needle electrode, separated from the slit into fine ink particles, and At the time of separation, a polar charge is generated that is attracted, and the needle electrode moves toward the single electrode and adheres to the recording paper. In addition, in the light irradiation method that uses light irradiation to separate ink particles from the head2, for example, the ink in the recording head is irradiated with a laser beam through a glass plate, and the laser beam inside the recording head is irradiated. Generate bubbles in the area. Since the ink is pressurized in the area where the bubble occurs, the ink protrudes from the head and advances to the recording paper. On the other hand, in an exposure/wet development type recording device, a photoreceptor on the drum surface is uniformly charged, and an electrostatic latent image is formed on the surface of the photoreceptor by irradiating it with light corresponding to the image to be recorded on the surface of the photoreceptor. This electrostatic latent image is then developed with a developer containing carrier and toner to be visualized into a toner image, and this toner image is transferred onto recording paper. In addition, the *t+t toner is attracted to the charge trap layer, and holes or electrons are formed in the charge trap layer in accordance with the image by irradiation with light corresponding to the image, and the attracted charged toner is trapped in the charge trap layer in accordance with the image. , an IT8 recording method (JP-A-62-52: 106)
There is also a publication number. [To be solved by the invention [ff] In the above-mentioned ink recording device of the charge W1 deflection type, since the charged W1 pole is located in the space between the ink ejection nozzle and the deflection W1 pole, at the time of starting or ending ink ejection, Charge 1m due to low ink ejection speed! Collision with 14 and charge '? f1
Extremely dirty. Furthermore, the charging electrode becomes dirty due to ink splashes caused by the ink jetting. When the charged fft pole gets wet with ink, 1? If the charging characteristics of the η electric W1 pole fluctuate and the amount of charge on the ink droplets becomes unstable, or in the case of multi-nozzle recording in which multiple horizontal dots are recorded virtually simultaneously, a short circuit may occur between adjacent charged fi electrodes due to ink. As a result, the desired charge cannot be achieved. In addition, in multi-nozzle recording, the charging pole is placed in the space between the ink jetting nozzle and the deflection electrode independently of the ink jetting nozzle, and the ink particles jetted from one ink jetting nozzle are transferred to one charged electrode (cylindrical). It is difficult to shorten the arrangement pitch of the charging electrodes because it is difficult to shorten the arrangement pitch of the charging electrodes. High density array is not possible. In the above-mentioned electric field suction type ink recording device, it takes a long time (
(SOaμsec) is required. That is, in order to record one dot, it is necessary to apply a voltage pulse of approximately 80 μsec or more to the needle electrode alone. Furthermore, a high voltage is required to create an electric field that attracts and separates the charged ink from the slit, and a relatively complicated and expensive switching circuit is required to generate pulses. In multi-stylus,
Since an insulating distance must be provided between adjacent needle electrodes, it is the rotation that increases the resolution of the recorded image. In the above-mentioned light irradiation type ink recording apparatus, the laser power is used to heat the ink in the portion of the recording head that is irradiated with the light beam to generate bubbles. A high power laser (N2 laser) is required. This output is approximately 2000 times the exposure power of a semiconductor laser used to expose a photoreceptor in electrophotographic recording, for example.
There is no prospect of general adoption. On the other hand, in the above-mentioned exposure/wet development type recording apparatus, a charger, an n-light optical system, a developing device,
Since a transfer seven-separation charger, a constant Xi device, a cleaner, etc. are provided, there are many mechanical elements, resulting in a complex device structure and a large volume. Furthermore, in a recording method in which toner is electrophoresed in a pattern by light irradiation, it is important to transfer the toner formed in a pattern onto recording paper. The present invention requires relatively few bending elements and simple mounting.
It is an object of the present invention to provide a single image recording method capable of performing line recording with a high pixel density in the horizontal direction. Means for solving C*a] The recording method of the present invention includes a slit (8) extending in the horizontal direction;
A flow path (8a) communicating with the slit (8), a pressurizing means (35) for applying pressure to the liquid in the flow path (8a) to be injected from the slit (8), and the pressurizing means (35) and the slit. (8) and a charge trap layer (7) facing each other and extending laterally with the flow path (8a) in between.
4) A photocharge generation layer (3) formed on the surface of the charge trapping layer (4) opposite to the surface facing the counter electrode (7).
, and a charge trapping layer (
4) of a developer jetting head (10) comprising a translucent electric field (2) formed on the opposite surface to the opposite surface;
A developing solution in which ISI forming particles are mixed with a carrier liquid is supplied to the flow path (8a), and a voltage of a predetermined polarity is applied between the translucent IT electrode (2) and the counter electrode (7). The image-forming particles in the developer are attracted to the full charge trapping layer (4), and the photocharge generating layer (3) is irradiated with light corresponding to the image to be recorded, so that the image-forming particles in the developer are irradiated therewith laterally. , a charge of the same polarity (+) as the polarity (-) of the transparent electrode (2) is formed, and this f! ! A charge is transferred into the charge trapping layer (4) and the charge traps the 1ilif imaging particles in an image-wise manner, and the light-transmitting one electrode (2) and the counter electrode (7)
) is applied within a voltage range that forms an electric field not exceeding the electric field created between the charge in the trap and the image forming particles, and the N1 charge traps the image forming particles. The image forming particles that were not formed are facing 1! (7)
While being suctioned, the pressurizing means (35)
, the liquid in the flow path (8a) is injected from the slit (8). Symbols within the description indicate elements corresponding to the embodiments shown in the drawings and described later. [Operation] By applying a voltage of a predetermined polarity between the translucent N1 pole (2) and the counter electrode (7), an electrostatic attraction force acts on one image forming particle, causing the image forming particle to become a charge trap. It is attracted to layer (4) and deposits 9A on its inner surface. In this state, by irradiating the photocharge generation layer (3) with light corresponding to the image to be recorded, electron/hole pairs are generated in the area irradiated with the light of the photocharge generation M (3), and the resulting transparent Photogenic i! ! ffA(2
), one of the charges (holes) with the same polarity (+) and (-) moves into the charge trapping layer (4). The image forming particles on this region are trapped by this charge (hole). .Here, the polarity of transparent In(2) (
If a voltage is applied so that the polarity (+) is the opposite polarity (=) and the polarity (- or GND) of the opposite frl pole (7) is the opposite polarity (+ or GND), it will not be trapped by the electrode (regular tag). The image-forming particles migrate toward the counter electrode (7). In other words, a charge trap! (4) Among the image-forming particles accumulated on the top, those that were not trapped by the charge of the light irradiation part (regular tag) form the charge trap layer (4).
and move toward the counter electrode (7). While moving in this way, the pressurizing means (35)
Since the liquid is injected through the slit (8), nine image forming particles are injected together with the carrier. In the light irradiation part, the H image forming particles remain piled up on the charge trap layer (4), so only carriers are ejected in this part. Therefore, onto the recording medium in front of the slit, only carriers containing no image forming particles are ejected in the light irradiation section, and carriers containing image forming particles are ejected in the non-sequential part of the light. The carrier white is virtually invisible, and in the embodiment where the recording medium is directly recorded, the carrier penetrates into the recording medium, but the 'ufJ image-forming particles are not visible during exposure/exposure.
Il! Similar to 1 to ner in the case of green, it adheres to the surface of the recording medium and does not substantially penetrate. Therefore, on the surface of the recording medium,
The image to be recorded is cursed with image-forming particles. When fixing of image forming particles is required. The recording medium is subjected to constant a treatment. Note that a recording may be formed on the surface of a transfer drum or the like as described above, and the recording may be transferred to a recording medium. In this way, in the present invention, charges are formed on the image forming particles in the lateral direction of the slit by exposure corresponding to the image to be recorded, and the carrier liquid is jetted over the entire length of the slit. Since this is performed at high resolution using laser scanning or the like, it is possible to record a high-density pixel distribution. In addition, clogging is less likely to occur than in the case of nozzles. Since the injection liquid is not an ink in which a coloring material is dissolved in a solvent, but a +32 image liquid in which image forming particles are mixed in a carrier, a clear recorded image without bleeding or blurring can be obtained. Furthermore, gradation recording by multi-gradation modulation of light intensity is also possible. Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings. [Embodiment] FIG. 1 shows an outline of the configuration of the main parts of an apparatus implementing the present invention in one embodiment, and FIG. 2 shows a longitudinal section of the head IO shown in FIG. 1. The developer tank 40 and developer cartridge 41 shown in FIG. A developer mixed with toner) is used. The developer in the developer tank 40 is sucked by a pump 42, pressurized, and supplied to an accumulator 43. In the accumulator 43, pressure fluctuations due to suction and discharge of the pump 42 are absorbed. A constant pressure developer is supplied to the recording head 10 through the electromagnetic switching valve 44. In this embodiment, in the head 10, toner, which is an image forming particle, which is distributed in the developer solution in a negative direction of it'+t, is first accumulated at the position of a charge trap layer 4, which will be described later. Next, the laser beam (
Light is emitted when the image signal is not recorded, and emitted first when it is recorded)
carriers (holes and electrons) are formed in the charging conductor 3 (described later) according to the image, and one of them, (holes)
The charges move into the charge trap M4 to trap the toner in an image-wise manner. Among the accumulated toners, toners whose charges are not trapped are caused by the electric field acting within the head 10 to move toward the opposite IT! Migrate in the carrier toward t4i7. At this point, the vibrator 35 is energized and pressure vibrations are applied to the developer. As a result, charges 1 to ner corresponding to pixels to be recorded in one main scanning line and carrier are simultaneously ejected from the slit 8 of the head IO. Since the toner in which tU has been trapped remains accumulated in the charge trap layer 4, it does not enter the carrier jetted from the slit 8. The jetted carrier containing the 5 toner collides with the recording paper 11, and the toner forms recording pixels on the surface of the recording paper 11 (recording). The carrier jetted onto the recording paper 11 permeates therein. It should be noted that the toner remaining 4J stacked on the charge trap layer 4 is released from the 1 to 1 wrap by exposure of the diode array 12. When recording is stopped, first the pump 42 is deenergized, and then the solenoid of the electromagnetic switching valve 8 is deenergized. The electromagnetic switching valve 44 disconnects the accumulator 43 and the head 10 by deenergizing the solenoid, and connects the accumulator 43 and the image liquid tank 40 to each other. A light-receiving slit 98 (shown in FIG. 2) for receiving laser light is provided on the lower surface of the disk base 9 of the recording head 10, and the laser exposure/scanning device 30 irradiates the laser light onto this light-receiving slit 98 (shown in FIG. 2). A slit 8 for jetting the developer is formed on the front surface of the recording head 10 along the longitudinal axis of the head IO (the width direction of the recording paper 11: the direction in which the backup roller 39 extends).
0 means nine. The laser exposure scanning device [30 is a well-known device used in so-called rape printers, and has two oscillation wavelengths of 780±1.
Light emitted by a light source 15 incorporating a 0 n* laser diode is passed through a first cylindrical lens 1G and then reflected by a first mirror 17. Next, through the spherical lens 18, the polygon fi1 rotates once.
Irradiate to 9. The rotating polygon mirror 19 is rotated at a constant speed by a motor 20 and reflects the irradiated light. As the polygon mirror 19 rotates, the angle of the mirror surface that reflects the irradiated light with respect to the irradiated light gradually increases.
The mirror surface for the irradiation light is updated every 60 degrees/6 rotations, and the reflected light from the polygon &119 is repeatedly swung (line scanning: main scanning M). II The light reflected by the first multi-rotation chain 19 is reflected by the second mirror SM, passes through the second cylindrical lens 2'c, and reaches the light receiving slit 9 of the recording head 10.
Proceed within a. During line scanning, a recording control device (not shown) turns on and off the laser diode of the light source 15 in accordance with the one-picture signal (signal indicating recording/non-recording of line content dots), and irradiates and de-irradiates light. j1((shoot,
■In order to obtain an optical scanning line synchronization signal representing the line scanning break (switching of the reflective surface and switching of the second line), a mirror 22 is placed outside the line scanning section, and this mirror 22 The light is detected by the photosensor 23, and this detection signal (line synchronization number) is given to the recording control device. The recording apparatus energizes the backup roller 39 to move the paper (liPJ scan) N at a constant speed. The entire surface of one sheet of paper is scanned for recording by the above-described main scanning (line scanning) and sub-scanning (paper feeding). The diode array 12 emits light when a voltage is applied from the toner trap release power supply circuit 53, and this light is transmitted to the head
The light beam advances into the light receiving slit 9a of 0 and uniformly exposes the inside of the slit 9a. FIG. 2 shows an enlarged cross-sectional view of the ink ejecting section of the ink recording head 10, and FIG. 3 shows an enlarged view of the area surrounded by the rectangle 2 (dotted chain line) in FIG. The structure of the ink recording head 1o will be explained with reference to FIG. 2 and FIG.
A glass L is fixed to the head base 9 by adhesive. The glass 1 has a transparent electrode 2 formed on its surface by aluminum vapor deposition. On the transparent N-pole 2, a photoconductor ((
') PC) 3 are bonded, a charge trap layer 4 is bonded to the surface of the charging conductor 3, and a charge trap layer 4
The surface of is coated with a protective layer (PL) 5. A positive voltage, a negative voltage, and an alternating current voltage r41 are selectively applied to the transparent electrode 2 from a power supply port &'+51. Charging electricity t! is applied across the developer chamber 54 of the recording head IO. i57a and 57b are installed facing each other, and these fig! A negative voltage is applied to +57a and 57b, and the toner in the developer in the developer chamber 54 is negatively charged due to the smell. The upper part of the protective layer 5 on the charge trap layer 4 is a groove 8a. That is, the protective layer 5 on the TUY trap layer 4 is located at the bottom of the groove 8a. This groove 8a communicates with the developer chamber 54 in the head IO, and also at the tip of the head IO.
It communicates with the slit 8 for developer jet i)I. The narrower the width of the slit 8 in the F direction, the faster the printing speed will be, but if it is too narrow, it will be difficult to supply the developer, so
(μllll'l is appropriate. Also, the second groove 8a of the charge trap layer 5 layer 5 is
can be omitted if the electrostatic adhesion force of the toner is sufficient when the toner is accumulated on the charge trap layer 4 as shown in FIG. However, if it is not present, some of the accumulated toner will be ejected together with the carrier, which tends to cause background sagging in the recorded image, so it is preferable to have it. The shallower the depth of the groove 8a, the more facing type (negative charge 1- towards the plate 7).
It is preferable that the electrophoresis time of the toner is short and the recording speed can be increased, and the width of the 1-thin layer 8a (in the direction in which the developer is ejected) should be larger than the diameter of the spot light for light irradiation. However, the depth and width of the groove 8a are determined by the accumulation (negative charge) that was not irradiated with light.
In order to reduce or eliminate the influence of the flow that the toner receives during carrier injection, the depth is set to 50 (
A suitable width of about 50 (μm) is 11. A charging counter electrode 7 is connected to the tip of the upper half 3I of the recording head 10 at a portion facing the photoconductor 3. Between the translucent fIt pole 2 and the counter electrode 7. The power supply circuit 51 applies a positive voltage, a negative voltage, and an alternating current voltage at predetermined timing.
A light-receiving slit 9a is opened for irradiating the photoconductor 3 located below the laser with a laser beam. The laser beam projected by the multi-faceted FI 19 is irradiated onto the glass (1) through the light receiving slit 98, passes through the slit 98, reaches the photoconductor 3, and the irradiation

[; Photocarriers (holes and electrons) are generated in the photoconductor 3. Since the electrode 2 has a positive potential, the electrons in the generated photocarriers are neutralized with the potential of the electrode 2 and disappear. On the other hand, the holes generated in the photoconductor 3 move into the charge trap M4. Figures 4a, 4b, 4c, 4(1) and 4e show the molecular structural formulas of CGM, donor!, donor 11° thiapyrylium salt, and polycarbonate resin. The photoconductor 3 is A eutectic solution of thiapyrylium salt, donor 1°, and binder polycarbonate resin dispersed in trichloroethane in a ratio of 1=l:2 was applied with a spray gun and dried to form a eutectic OPC (photoconductive The eutectic ○PC is a charge photoreceptor in which both holes and electrons move. Also, CG is formed between the translucent electron 1 and the electron 2.
M is coated with a thickness of 0.1 [μm], and CG
If M is not coated, light is applied to the photoconductor 3.
It is necessary to set the wavelength of the semiconductor laser to 680 (n+i+). WE Tsu! The jt/wrap layer 4 is made by applying 100 layers of phenolic resin as a binder to the negative side of the photoconductor 3, and applying 100 layers of phenolic resin to the negative side of the photoconductor 3, and adding 100 layers of binder to the negative side of the photoconductor 3.
o It<1 part, and an alcohol solvent solution containing 1 part of Donor 11 was applied and dried to give 1[μ+n
) thickness. CGM so that holes generated in the photoconductor 3 move at high speed and are trapped in the charge trapping layer 4. donor! , Donor II, each ionization potential energy (IP) of, CGMIII. Donor (1) IF, Donor (II) IP, CGM
Each material is selected so that lF'> donor (IN P > donor (IT) IP.
Because 1 is different! Holes that enter the charge trapping layer 4 from the eutectic OPC are hopping around the donor I and while moving, fall into the donor I and become trapped. The probability is 80%
It is. A thin layer of phenolic resin (0,
2pm) uniformly coated with 31 layers of rtMrI (]
The developer forming the JL, ) 5 is Aitzuba G (trade name,
Exxon Chemical 1. H) is j production. Is 1~ner also the conventional electronic 'q true method? It may have the same configuration as the 5d type 1-ner. When a voltage of a certain polarity is applied, the vibrator 35 bends back so as to bulge toward the developer chamber 54 and pressurizes the developer. The developer solution is bent outward from the chamber 54 (curved backwards).
The backup roller 3ε supporting the back surface of the recording paper facing the slit 8 of the recording head 10 is electrically conductive in this embodiment, and there is no ramp to the jet 1 from the slit 8. In order to give attractive force to the negative charge toner,
Positive voltage is applied. Next, a recording method according to an embodiment of the present invention will be explained. FIG. 5 shows the laser beam, toner 1 to unwrapping, and voltage application between electrodes 2 and 7 in this embodiment. The timing relationship between and the excitation of the /Ill mover 35 is shown. In this embodiment, the charging WE electrode 57a. 571) is continuously applied with a negative voltage to negatively charge the toner in the developer in the developer chamber 54 at the time of tit. Referring to FIG. 5, before one line r scanning (line n light) of the photoconductor 3, between the transparent ttt electrode 2 and the counter electrode 7, a voltage of plus 500 [V] is applied to the electrode 2, and O to electrode 7,
Apply 0 (V). As a result, the negatively charged toner is attracted toward the translucent electrode 2 and becomes a charge trap [4].
It is accumulated in the upper protective layer 5''. When a voltage is applied between the electrodes 2 and 7 to collect toner on the charge trap M4 side and one line of R light is applied, photocarriers (electronic f and holes) are generated, and electrons move to the transparent electrode 2 side, and holes move to the charges 1 to lamp layer 4. The moved holes trap toner. Next, the pole 2 knee 20o (V), opposed m 7
When a voltage of 0.0 (V) is applied, the accumulated toner migrates toward the counter electrode 7 along the electric field between the electrodes 2 and 7, but the toner that has migrated in the electric protection trap layer 4 migrates. The electrons trapped by charges (holes) do not move. The toner that was not trapped moves inside the slit 8 to the opposite mt.
As lff1 moves toward M7, the vibrator 35 is excited to inject the carrier containing toner in eight motions from the slit (Learn injection). Before this ejection, in order to prevent the negatively charged toner from reaching the counter electrode 7, a voltage of AC 1 is applied between the transparent electrode 2 and the counter electrode 7. Note that an alternating current voltage superimposed on a direct current voltage may be applied. When the above injection is finished, 200 (V) is applied to the transparent electrode 2.
Apply. At this time, a voltage is applied to the power supply circuit 53,
The diode array 12 uniformly exposes the transparent electrode 2 to light. Then, carriers (holes, electrons) are generated in the photoconductor 3 subjected to exposure. Of the carriers that occurred,
Are holes transparent? ! tJ4i2 (minus) and disappear, and on the other hand, the electrons move to the charge trap layer 4 and neutralize the holes existing in the charge trap layer 4. As a result, all of the trapped toner electrophoresed toward the counter electrode 7, so if the translucent electrode 2 was grounded during this movement, the initial state was restored and the toner was released from the trap. It turns out. After this, the transparency is 1+ again! ! Between pole 2 and counter electrode 7, plus 500V to electrode 2, opposite 'Rt & 7 ni,
o CV ) and repeat the above operations. Figures 6a, 6b, 6c, and G (Figures 1 and 6e show models representing the printing process of the recording head 10. The operations will be explained in more detail with reference to these. Then, first, after the previous line injection is completed, negatively charged toner is supplied from the developer chamber 54 side toward the slit 8 (Figure 6a). , when O, 0 (V) is applied to the counter electrode 7, the supplied toner enters the groove 8a section, is attracted toward the translucent electrode 2 at the 1fIaa section, and is stored on the charge trap layer 4. !!It is integrated on the layer 5. When the glass l is exposed to laser light corresponding to a pixel by the laser exposure scanning device 30, the laser light reaches the photoconductor 3 through the glass 1 and the transparent electrode 2, and the photoconductor Conductor: 3
Photocarriers (holes and electrons) are generated in the Among these photocarriers, the ft electrons enter the electrode 2 to which a positive voltage is applied and disappear, and the real tag moves into the charge trap layer 4. The toner located on the trap layer 4 is trapped by the hole in the wrap layer 4 when the charge 1 moves to the charge 4 (
FIG. 6b), and FIG. 7 shows a mode in which toner is trapped in an image-wise manner by holes that have moved to the charge trap layer 4A. Next, -200 (V) is applied to electrode 2, and 0.0 (V) is applied to counter electrode 7.
), the 1-ners that were not trapped by the holes in the charge trapping layer are forced to face each other due to the electric field acting between electrodes 2 and 7. 1!1 Migrates toward 7 (Figure 6c). At the timing when the Mides-charged toner migrating toward the counter electrode 7 rises to the position of the ejection line of the slit 8, the toner is prevented from rising further (the counter electrode 7
(to prevent it from accumulating and adhering to the surface) 12-7
AC voltage is applied between. The negatively charged toner vibrates up and down at the ejection line level of the slit 8. When a pulse voltage is applied to the vibrator 35 and the liquid pressure rises, the negative charge 1-su on the ejection line of the slit 8 is ejected from the slit 8 of the recording head 10 together with the carrier liquid. At this time, the negative charged toner (accumulated toner) trapped on the f@ charge trap M4 by the holes generated by the light irradiation remains in the groove 8a, and in that region, only the carrier liquid flows from the slit 8. The toner is ejected, but substantially no toner is ejected (Fig. 6d). The developer carrier ejected from the slit 8 of the recording head 10 and the untrapped negatively charged toner collide with the first sheet of recording paper, and only the negatively charged toner forms recording pixels of the recorded image. Furthermore, with −200 (V) applied to the transparent electrode 2, fl! (When 42 is irradiated with light by the diode array 12 and exposed uniformly, electrons and holes are generated in the photocharge generation layer 3 due to the exposure. The holes enter the electrode 2 and disappear, and the electrons uniformly become charge traps.) The electrons move into the layer 4, and in order to neutralize the holes in the charge trap layer 4,
The toner trapped in the charge trap layer 4 moves toward the counter electrode 7 (FIG. 6c). While the toner is moving, the translucent electric conductor 2 is grounded and toner is supplied, returning to the initial state (Fig. 6a) again. The operations described above in Figs. 6a to 6e are repeated. According to the recording method described above, there is no need to install an ink load fI!''?t1 pole in front of the head, and recording can be performed without installing a deflection electrode or a gutter. Even when the laser exposure scanning device is used as described above, the optical power is sufficient to be equivalent to the semiconductor laser output of an electrophotographic laser printer. In addition, for example, a slit exposure optical system can be used that simultaneously projects the original image for one line.By changing the amount of photocarrier generation by changing the laser illumination intensity or irradiation time, one pixel multivalue recording (1 line) can be used. In addition, the resolution is mainly determined by the laser spot diameter, and since the toner particle size is small, it is possible to record 1000 squares (1 pixel 24.4μ).From slit 8 Because the developer is sprayed, there is almost no clogging, but when not in use, the f!electrode -
By applying a voltage of the same polarity (the level may be low) to 71'IJ11 as the polarity during use to accumulate toner on the protective layer 5, the effect of preventing clogging of the slits 8 is enhanced. In the above embodiment, one line of the entire width of the recording paper 11 is recorded simultaneously with one slit 8, but the slit length of 1542 minutes is divided into a plurality of ff&, for example, 5 to 50 m long. It may be divided into slits and recording may be performed for each slit. Furthermore, by adding a temporary hole (for example, a plate with holes of 50μΦ open at 100μ intervals) to the tip of the slit 8 to change the filamentous jets into small spherical jets, the flight of the jets is more stable. do. The spacing between the holes is determined by pinching the laser beam, and the diameter of the holes is preferably set to approximately one inch of the image dots, taking into account the spread of the ink. Further, in the above embodiment, since a positive voltage is applied to the backup roller 39, the image becomes sharp. Further, the distance between the head 10 and the recording paper ti can be set relatively long. By making the backup roller 39 a knife-shaped conductor, the electric field is concentrated on the edges, further increasing the effect. The positively charged toner is collected on the charge trap layer 4, and the positively charged toner is attracted by the negative potential of the electrode 2, accumulated on the charge trap layer 4, and becomes positively charged by light irradiation! '[! It is also possible to trap +-ners. In this case, the positively charged toner that has not been trapped and tL is ejected onto the charge trap layer 4. Furthermore, in the above embodiment, the diode array 12 was installed and exposed in order to release the 1-toner trapped in the head 0 after the toner was ejected, but in order to further miniaturize the device, Then, exposure to release the toner trap is performed using a laser n-light scanning bag [30].
(b) The diode array 12 may be omitted; in this case, the exposure scan of the image signal of the laser exposure scanning device 30 and the exposure scan for releasing the toner trap are alternately scanned. In other words, 1 in 2 scans
Line recording will end. During the exposure scan for releasing the toner trap, the diode of the light g15 is always kept in a light emitting state during the scan. [Effects of the Invention] According to the present invention, the charge electrode, deflection electrode, and gutter outside the head are omitted, high-density dot recording can be performed in the recording line direction, and the ejected liquid is less likely to cause clogging. However, since it is not an ink containing a coloring material in a solvent, but a developer containing image forming particles mixed in a carrier, a clear aRR image without bleeding or blurring can be obtained. Also,
Even when laser exposure scanning is used, there is no need to make the optical power particularly high, and high-resolution and high-speed recording can be achieved with low-power light irradiation. Furthermore, gradation recording by multi-gradation modulation of light intensity is also possible.

[Brief explanation of drawings]

FIG. 1 is an M view showing the main parts of an apparatus configuration for carrying out one embodiment of the present invention. FIG. 2 is an enlarged sectional view of the recording head 10 of FIG. 1 taken along the line nn. Figure 3 shows the rectangle II indicated by the chain double-dashed line in Figure 2! FIG. 2 is an enlarged sectional view of the portion shown in FIG. FIG. 4a is a plan view showing the molecular structure of CGM, which is the transparent M shown in FIG. 3 and is coated between the pole 2 and the photoconductor 3. FIG. FIGS. 4b and 4c are plan views showing the molecular structures of donor I and donor II, which are components of charge trapping layer 4 shown in FIG. 3. FIG. FIGS. 4d and 4e are plan views showing the molecular structures of thiapyrylium salt and polycarbonate resin, which are components of the photoconductor 3 shown in FIG. 3. FIG. FIG. 5 shows the laser exposure scanning of the recording device shown in FIG.
Hydraulic vibration applied by vibrator 35. and a time chart showing the relationship between exposure and scanning for toner trap cancellation. 6a, 6b, 6C, 6(1), and 6e are schematic cross-sectional views of the head 10 showing the printing process in an embodiment of the present invention. 1 is an enlarged view schematically showing how the regular tag generated in the photoconductor 3 moves to the charge trap layer 4 and traps toner in the application process shown in the figure. 1 Ni glass 2: Transparent electrode (transparent electrode) 3: Photoconductor (photocharge generation M) 4: Charge trap M (charge trap layer) 5: Protective layer
6: Upper body 7: 1 example of opposing electric current (opposing Wt
pole) 8 Nislit (slit) aa: Groove (channel) 9: Head base 9a: Light receiving slit 10: Recording head (developer jetting head)
ll: Recording paper +2: Diode eyelet 15: Light $ +6: First cylindrical lens 17; First mirror
18 Nisferical lens 19: Multifaceted fi
20: Motor SM: Second mirror
2I; Second cylindrical lens 22: Mirror
23: Photo sensor 30: Laser exposure scanning device 31: Upper body 32: Vibration plate
33, 34: Bimorph piezo chord 35: Oscillator (
Pressure means) 39: Back unroller 40: @image liquid tank
41: Developer cartridge 42: Pump 43: Accumulator 44: f
i! Magnetic switching valve 50: Developer supply device 51
: Power supply circuit 52 : Excitation circuit 53 - Trap release power supply circuit 54 : 35'! Image chamber (flow path) Figure 4a Figure 4b H3

Claims (1)

[Claims] A slit extending in the horizontal direction, a flow path communicating with the slit, a pressurizing means for applying pressure to the liquid in the flow path to be injected from the slit, and opposing faces between the pressurizing means and the slit with the flow path interposed therebetween. a counter electrode and a charge trapping layer extending in the lateral direction; a photocharge generation layer formed on a surface of the charge trapping layer opposite to the surface facing the counter electrode; and a charge trapping layer of the photocharge generation layer. A developing solution in which image forming particles are mixed with a carrier liquid is supplied to the flow path of a developer jetting head including a translucent electrode formed on the opposing surface and a translucent electrode formed on the opposite surface. A voltage of a predetermined polarity is applied between the electrode and the counter electrode to attract the image forming particles in the developer to the charge trap layer, and the photocharge generation layer is irradiated with light corresponding to the image to be recorded. forming a charge thereon in the horizontal direction corresponding to the image and having the same polarity as the polarity of the transparent electrode;
This charge is transferred into the charge trapping layer to trap the image forming particles in an image-corresponding manner, and a voltage of a predetermined polarity and the opposite polarity is applied between the light-transmitting electrode and the counter electrode at the trap. The pressurizing means applies within a voltage range that forms an electric field that does not exceed the electric field that acts between the charge and the image-forming particles, and while the image-forming particles that are not trapped by the charge are attracted to the counter electrode. An image recording method by exposure, wherein the liquid in the flow path is ejected from the slit.