JPH02279343A - Recording method for image by exposure - Google Patents

Abstract

PURPOSE:To record high density pixel distribution by forming charge of image forming particles longitudinally of a slit by exposure corresponding to an image to be recorded, and injecting carrier liquid over whole slit length. CONSTITUTION:A voltage is applied between a light transmission electrode 2 and an opposite electrode 7 before an organic semiconductor 3 is scanned by one line. Accordingly, negative charge toner is attracted toward the electrode 2, and integrated on a protective layer 4 on the semiconductor 3. Thus, when the voltage is applied between the electrodes 2 and 6 to integrate toner at the semiconductor 3 side and one line is exposed, optical carrier (electrons and holes) is generated at the exposed position of the semiconductor 3, the electrons are moved to the electrode 2, the holes are moved to toner in developer, the toner is charged positively, and moved toward the electrode 7 along an electric field between the electrodes 2 and 7. In this case, a vibrator 35 is excited to inject the carrier including positive charge toner from a slit 8 during moving. Thus, a line recording is performed laterally in high pixel density.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates in one aspect to a visible medium ejection type recording method similar to inkjet recording, and in the other aspect to photoreceptor exposure type recording.

[Conventional technology]

In charge deflection type inkjet recording devices.

A charging electrode is disposed between the ink jetting nozzle and the deflection electrode, and a charging voltage is applied to the charging electrode at the timing when the ink is turned into particles from the ink jetting nozzle.

Due to the ill electric field between the charged electrode and the ink in the head, charges of opposite polarity to the charged electrode are concentrated at the leading edge of the ink protruding from the ink ejection nozzle, and when the protruding ink is separated into particles, the ink particles Carrying only charges of opposite polarity (charge). The charged ink particles are deflected by a deflection electric field while passing between the deflection electrodes. For example, uncharged or low-level charged ink particles collide with a gutter and are collected in an ink tank, and ink particles charged to a predetermined level or higher pass outside the gutter and collide with recording paper (recording).

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 recording needle electrode) is facing the slit and the recording paper, and the multi-stylus is relatively close to the needle electrode (to be exact, between the ink of the head and the needle electrode itself). When a high voltage is applied to the slit, 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 the polar charge attracted during this separation is reduced. arise,
The needle moves toward the single electrode and adheres to the recording paper.

In addition, in a light irradiation method that uses light irradiation to separate ink particles from the head, 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, the photoreceptor on the drum surface is uniformly charged, and the photoreceptor surface is irradiated with light corresponding to the image to be recorded to form an electrostatic latent image on the photoreceptor surface. This electrostatic latent image is developed with a developer mixture of carrier and toner to develop it into a toner image, and this toner image is transferred onto recording paper.

[Problem to be solved by the invention]

In the charge deflection type ink recording device described above, the charge electrode is located in the space between the ink jet nozzle and the deflection electrode, so when ink jetting starts or ends, the ink jetting speed is low and collides with the charging electrode. Contaminate the charging electrode. Furthermore, the charging electrode becomes dirty due to ink splashes caused by the ink jetting. When a charging electrode gets wet with ink, the charging characteristics of the charging electrode change and the amount of charge on the ink particles becomes unstable.In the case of multi-nozzle recording, in which many horizontal dots are recorded virtually simultaneously, adjacent charges may become unstable. The ink short-circuits the electrodes, making it impossible to achieve the desired charge. In addition, in multi-nozzle recording, a charged electrode is placed in the space between the ink ejecting nozzle and the deflection electrode independently of the ink ejecting nozzle, and ink particles ejected from one ink ejecting nozzle are transferred to one charged electrode (cylindrical). In addition, it is necessary to insulate adjacent charging electrodes, so it is difficult to shorten the arrangement pitch of the charging electrodes, and to increase the horizontal height of the ink jet nozzle. Density array is not possible.

In the above-mentioned electric field suction type ink recording device, it takes a long time (
(about 800 μsec). That is, in order to record one dot, it is necessary to apply a voltage pulse of approximately 800 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 U path is required for pulsing this voltage. In a multi-stylus, an insulating stylus must be placed between adjacent needle electrodes.

Improving the resolution of recorded images is a national destiny.

In the above-mentioned light irradiation type ink recording apparatus, a high-power laser (
N2 = the) is required. This output is about 2000 times the exposure power of a semiconductor laser used to expose a photoreceptor in electrophotographic recording, for example, and there is no hope that it will become widespread.

On the other hand, in the above-mentioned exposure/wet development type recording apparatus, a charger, an exposure optical system, a developing device, a transfer/separation charger, a fixing device, a cleaner, etc. are arranged around the photoreceptor drum, so there are many mechanical elements in the device structure. is complex and has a large volume.

An object of the present invention is to provide an image recording method that can perform line recording at high pixel density in the lateral direction with a relatively small number of mechanical elements and a simple device structure.

[Means to solve the problem]

In the present invention, a slit (8) extending in the horizontal direction, a flow path (8a) communicating with this slit (8), and a flow path (8a)
Pressurizing means (35) for applying pressure to the liquid to be injected from the slit (8), this pressurizing means (35) and the slit (8)
) and a photocharge generation layer (3) that faces each other with a channel (8a) in between and extends laterally, and a counter electrode (7) of this photocharge generation layer (3). In the flow path (8a) of the developer jet head (10), the developer jet head (10) includes a light-transmitting electrode (2) formed on the surface opposite to the surface facing the .
Supplying a developer solution in which image forming particles are mixed with a carrier solution,
A voltage of a predetermined polarity is applied between the light-transmitting electrode (2) and the counter electrode (7) to attract image forming particles in the developer to the photocharge generation layer (3). (3) is irradiated with light corresponding to the image to be recorded, and charges of the same polarity (+) as the polarity (+) of the translucent electrode (2) corresponding to the image in the horizontal direction are transferred to the image in the developing solution. While the charged image forming particles are being attracted to the counter electrode (7), the liquid in the flow path (8a) is forced into the slit (8) by the pressurizing means (35).
).

Note that symbols in parentheses indicate corresponding elements in the embodiments shown in the two drawings and described later.

[Effect]

By applying a voltage of a predetermined polarity between the translucent electrode (2) and the counter electrode (7), an electrostatic attraction force is applied to one image forming particle, and the image forming particle is attached to the photocharge generation layer (3). ) and accumulate on its inner surface. By irradiating the photocharge generating layer (3) with light corresponding to the image to be recorded in this state, electron/hole pairs are generated in the irradiated portion of the photocharge generating layer (3), and the resulting transparent One side (hole) with the same polarity as the polarity (+) of the light-transmitting electrode is injected into the image-forming particles in the developer, and the image-forming particles are charged with the same polarity as the polarity (+) of the light-transmitting electrode. , which migrates toward the counter electrode (7). Namely.

Among the image forming particles accumulated in the photocharge generation layer (3), those charged at the light irradiation part move away from the photocharge generation layer (3) and toward the counter electrode (7). While moving in this manner, the pressurizing means (35) injects the liquid in the channel (8a) from the slit (8), so that the charged image forming particles are injected together with the carrier.

In the non-irradiated area, one image forming particle forms a photocharge generation layer (3).
Since the carrier remains accumulated on the top, only the carrier is injected at this location. Therefore, carriers containing image forming particles are ejected onto the recording medium in front of the slits in the light irradiated areas, and only carriers containing no image forming particles are ejected in the non-light irradiated areas. The carrier itself is virtually invisible; in direct-to-recording embodiments, the carrier penetrates the recording medium; however, the image-forming particles are absorbed into the recording medium, similar to the toner in exposure/wet development recording. Adheres to surfaces and is virtually impermeable. Therefore, the image to be recorded appears as image-forming particles on the surface of the recording medium. If it is necessary to fix the image forming particles, the recording medium is subjected to a fixing process. Note that a record may be formed on the surface of a transfer drum or the like as described above and then transferred to a recording medium.

In this way, in the present invention, charges are formed on the image forming particles in the longitudinal direction (horizontal 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 it can be performed by scanning or the like with optical image resolution, 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 jetted liquid is not an ink containing a coloring material dissolved in a solvent, but a developer containing a carrier and image forming particles mixed therein, 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.

〔Example〕

FIG. 1 shows an outline of the configuration of the main parts of an apparatus for carrying out one aspect of the present invention, and FIG. 2 shows a longitudinal section of the head 10 shown in FIG. 1. The developer tank 40 and developer cartridge 41 shown in FIG. 5 to 30% of donor I represented by the chemical formula shown in Figure 4b is added to the carrier of a developer prepared by mixing a toner with
Vt,% dispersed to enable injection of holes into the toner from the carrier, and the toner contains 5% each of donor I and donor 2 represented by the chemical formula shown in FIG.
Contains ~50 wt% and 0.05-5vt,% developer.

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 IO through the electromagnetic switching valve 44. In this embodiment, in the head 10, toner, which is an image forming particle that is negatively charged and distributed in a developer, is first accumulated at a position of an organic semiconductor 3, which will be described later, which is a photocharge generation layer. Next, the accumulated toner is charged to a positive potential by a laser beam irradiated by the laser scanning device 30 (light is emitted when the image signal is recorded; no light is emitted when the image signal is not recorded). The toner charged to a positive potential migrates in the carrier toward the counter electrode 7. At this point, the vibrator 35 is energized to apply pressure vibrations to the developer. As a result, charged toner and carrier corresponding to pixels to be recorded in one main scanning line are simultaneously ejected from the slit 8 of the head 10. Since the uncharged toner remains integrated in the organic semiconductor 3, it does not enter the carrier jetted from the slit 8. The ejected carrier containing the charged toner collides with the recording paper 11, and the charged toner forms recording pixels on the surface of the recording paper 11 (recording). The carrier jetted onto the recording paper 11 permeates therein.

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 and communicates the accumulator 43 and the developer tank 40 by deenergizing the solenoid.

A light-receiving slit 9a (shown in FIG. 2) for receiving laser light is provided on the lower surface of the head base 9 of the recording head 10, and a light-receiving slit 9a (shown in FIG. 2) for receiving the laser light is formed here. A slit 8 through which the developer is jetted is formed on the front surface along the longitudinal axis of the head 10 (the width direction of the recording paper 11 and the direction in which the backup roller 39 extends).

The laser exposure scanning device 30 is a known device used in a so-called laser link, and has one oscillation wavelength of 780±1.
Light with built-in 0 nm laser diode! The light emitted by the lens 15 is reflected by the first mirror 17 through the first cylindrical lens 6, and then reflected by the spherical lens 1.
8 to a one-rotation polygon mirror 19. Rotating polygon mirror 1
9 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 irradiated light is updated every 60 degrees/6 rotations, and the reflected light of the multifaceted file is repeatedly swung (line scanning: main scanning) The light reflected by the 0-rotation polygonal mirror I9 is transferred to the second mirror SM reflected by the second cylindrical lens 21
During line scanning, a recording control device (not shown) controls the laser diode of the light source 15 in response to an image signal (a signal indicating recording/non-recording of line content dots). In order to obtain an optical scanning line synchronization signal that indicates the division of one line scanning (switching of the reflective surface and switching of the second line), the light is turned on and off to irradiate and non-irradiate light. A mirror 22 is arranged, and the light reflected by this mirror 22 is detected by a photosensor 23, and this detection signal (line synchronization signal) is given to the recording control device.

The recording apparatus drives and energizes the bank up roller 39 at a constant speed for paper feeding (sub-scanning). Main scan (line scan)
The entire surface of one sheet is scanned for recording by sub-scanning (paper feeding).

FIG. 2 shows an enlarged cross-sectional view of the ink ejecting section of the ink recording head 10, and FIG. The structure of the ink recording head 10 will be described with reference to FIG. 1. A head base 9 is bonded to the lower half 6 of the ink recording head IO, and a glass l is fixed to the head base 9 by bonding. The glass 1 has a transparent electrode 2 formed on its surface by aluminum vapor deposition.

An organic photoconductor (CG L) 3, which is a charge generation layer, is bonded to the top of the transparent FT, and the surface of the organic semiconductor 3 is covered with a protective layer (PL) 4.

A positive voltage or alternating current is selectively applied to the transparent electrode 2 from a power supply circuit 51.

Electrodes 57a and 57b for charging are installed facing each other so as to sandwich the developer chamber 54 of the recording head 10, and a negative voltage is applied to these electrodes 57a, 57b, thereby charging the developer chamber 54. The toner in the developer is negatively charged.

The upper part of the protective layer 4 on the organic semiconductor 3 is a groove 8a. That is, the protective layer 4 on the organic semiconductor 3 is placed at the bottom of the groove 8a.
is located. This groove 8a is a developer chamber 54 in the head 10.
It also communicates with a slit 8 at the tip of the head 10 for jetting the developer. The narrower the width of the slit 8 in the vertical direction, the faster the printing speed will be, but if it is too narrow, it will be difficult to supply the developer, so a range of 10 to 100 (μ■) is appropriate.

Further, the groove 8a on the protective layer 4 on the organic semiconductor 3 is.

As shown in FIG. 6b, if the electrostatic adhesion force of the toner is sufficient when the toner is accumulated on the organic semiconductor 3, and the flow when the carrier is ejected can be countered, it may be omitted. If not, some of the accumulated toner will be ejected together with the carrier and background stains will likely occur on the recorded image, so it is preferable to have one. The depth of the groove 8a is preferably shallow in order to shorten the electrophoresis time of the positively charged toner toward the counter electrode 7 and increase the recording speed. It is sufficient that the diameter of the spot light is larger than the diameter of the spot light. However, the depth and width of the groove 8a are influenced by the flow of accumulated (negatively charged) toner that has not been irradiated with light during carrier injection.

In order to reduce the number of defects or eliminate them, it is appropriate that the depth be approximately 5 to 30 [μmE] and the width approximately 50 to 300 [μm]. Alternatively, the width may be made sufficiently narrow and a separate electrode may be provided to trap or accumulate the negatively charged toner.

A counter electrode 7 for charging is connected to a portion of the tip of the upper half 31 of the recording head 10 that faces the organic semiconductor 3 .

A power supply circuit 51 is provided between the transparent electrode 2 and the counter electrode 7.
Positive voltage and AC voltage are applied at predetermined timing.

The head base 9 has a light receiving slit 9a for irradiating a laser beam through the glass 1 onto the organic photoconductor 3 located directly below the groove 8a.

The laser beam projected by the polygon mirror 19 is irradiated onto the glass l through the light receiving slit 9a, passes through it, and reaches the organic semiconductor 3. Due to this irradiation, photocarriers (holes and electrons) are generated in the organic semiconductor 3. do. 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 organic semiconductor 3 pass through the protective film 4 and are injected into the toner accumulated in mBa.

At this time, the CGM in the organic semiconductor 3, the donor I in the ink, the donor ■,
each ionization potential energy (I P
), CGMIP.

Donor (1) IP, Donor (II) IP, CGM
Each material is selected so that I P > Donor (r) IP) Donor (II) IP.

Figures 4a, 4b, and 4c show the molecular structural formulas and values of ionization potential energy rp of CGM, donor (I), and donor (II) selected as described above.

Organic semiconductor 3 contains CGM at 30% (w%) and donor (T
) to 25 (we%), polygabonate resin to 25 [wt
%] and the thickness is set to 0.3μ.

Since the CGM of the organic semiconductor 3 is soluble in the carrier liquid of the developer, a protective film is necessary, and a thin (0.2μ) protective layer (
PL) 4 is uniformly coated.

The material of the protective layer 4 is phenol resin.

The developer consists of solid particle toner and a carrier liquid.The carrier liquid needs to have high resistance in order to detect the horizontal spread of holes, and is generally used as a wet developer for electrophotography. Isovar G, a petroleum-based solvent that
(trade name, manufactured by Exxon Chemical Company) is suitable. Gearia also contains donor (1) at 5 to 301:nt,%.
] This allows holes to be injected from the carrier as well when injecting them into the toner.

The toner may basically have the same composition as the conventional electrophotographic wet toner, but in order to ensure hole injection and trapping more quickly, the donor (1) may be added at 5 to 50 [wt%].
] and donor (II) in an amount of 0.05 to 5 (wt%), respectively.

When a voltage of a certain polarity is applied, the vibrator 35 bends back to bulge toward the developer chamber 54 and pressurizes the developer, and when the voltage disappears or a voltage of the opposite polarity is applied, the vibrator 35 closes the developer chamber 54.
The pressure in the developer chamber 54 is lowered by bending outward (curving backward).

The backup roller 39 supporting the back surface of the recording paper facing the slit 8 of the recording head 10 is electrically conductive in this embodiment, and a negative voltage is applied thereto so as to apply an attractive force to the positively charged toner ejected from the slit 8. has been done.

Next, a recording method according to an embodiment of the present invention will be explained.

FIG. 5 shows the laser exposure and electrode 2-
7 shows the timing relationship between the voltage application to the oscillator 7 and the excitation of the vibrator 35. Note that in this embodiment, the charging electrode 57
A and 57b are continuously applied with a negative voltage so that the toner in the developer in the developer chamber 54 is always negatively charged.

Referring to FIG. 5, before one line scanning (line exposure) of the organic semiconductor 3, a voltage of +100V is applied to the electrode 2, and O, 0 ( V)
Apply. As a result, the negatively charged toner is attracted toward the transparent electrode 2 and the protective layer 4 on the organic semiconductor 3
accumulate on top. When a voltage is applied between the electrodes 2 and 7 and one line exposure is performed with toner accumulated on the organic semiconductor 3 side, photocarriers (electrons and holes) are generated in the exposed area of the organic semiconductor 3. is generated, and the electrons pass through the transparent electrode 2
On the other hand, holes move to the toner in the developer, the toner becomes positively charged, and migrates toward the counter electrode 7 along the electric field of f[2-7rJI. At this time, the vibrator 35 is excited to eject the migrating carrier containing the positively charged toner from the slit (line ejection). Before this injection,
In order to prevent the positively charged toner from reaching the counter electrode 7, an alternating current voltage 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, the transparent electrode 2 and the counter electrode 7 are
During this period, +100V is applied to electrode 2, and 0.0V is applied to counter electrode 7.
CV) and repeat the above operation.

6a, 6b, 6c, and 6d show models representing the printing process of the recording head 10. To explain the recording operation in more detail with reference to these, first, after finishing the previous line injection, when +100V is applied to the electrode 2 and 0 (V) is applied to the counter electrode 7t, the developer chamber 54
Negatively charged toner is supplied from the side toward the slit 8 and enters the groove 88 (FIG. 6a).

Then, the particles are drawn toward the light-transmitting electrode 2 in the groove 8a and accumulate on the protective layer 4 on the organic semiconductor 3 (FIG. 6b).

When the glass 1 is exposed to a laser beam corresponding to a pixel by the laser exposure scanning device 30, the laser beam reaches the organic semiconductor 3 through the glass 1 and the transparent electrode 2, and photocarriers (holes and holes) are generated in the organic semiconductor 3. electron) is generated. Among these photocarriers, electrons enter the electrode 2 to which a positive voltage is applied and disappear, and holes pass through the protective layer 4, enter the developer, and are trapped by the accumulated toner.

The toner that has trapped the holes changes its charging characteristics from negative to positive, so it migrates toward the anti-bird electrode 7 due to the electric field formed between the electrodes 2 and 7 (Figure 6c).
. Note that FIG. 7 shows a process in which holes are trapped in toner.

The positively charged toner migrating toward the counter electrode 7 is
At the timing when the ejection line of the slit 8 has risen, an AC voltage is applied between the electrodes 2 and 7 to prevent the ejection line from rising further (to prevent it from accumulating and adhering to the counter electrode 7). vibrates vertically at the jet line level of the slit 8. When a pulse voltage is applied to the vibrator 35 and the liquid pressure increases, the positively charged toner that was 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 groove 8a
There remains negatively charged toner (accumulated toner) that has not been irradiated with light and its charging characteristics have not changed, and in that area,
Only the carrier liquid is ejected from the slit 8, and substantially no toner is ejected (FIG. 6d).

The developer carrier and positively charged toner ejected from the slit 8 of the recording head 10 collide with the recording paper 11, and of these, only the positively charged toner forms recording pixels of a recorded image.

According to the recording method described above, there is no need to install an ink charging electrode 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, its optical power is sufficient to be equivalent to the semiconductor laser output of an electrophotographic laser printer. As the light irradiation means, in addition to such a laser exposure scanning device, for example, a slit exposure optical system that simultaneously projects one line of the original image can be used. By changing the amount of photocarriers generated by changing the laser illuminance or irradiation time, single-pixel multivalue recording (single-pixel gradation recording) is possible.The resolution is mainly determined by the laser spot diameter, and the toner Due to the small particle size, l0
It is also possible to record at 00 DPI (24.4 microns per pixel).

Since the developer is injected from the slit 8, clogging is unlikely to occur, but when not in use, apply a voltage (the level may be low) between electrodes 2 and 7 with the same polarity as when in use. By accumulating toner on the protective layer 4, 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 at the same time using one slit 8, but the length of the slit for one line is divided into a plurality of pieces, for example, 5 to 50 mm long. It may be divided into slits and recording may be performed for each slit.

Further, in the above embodiment, since a negative voltage is applied to the backup roller 39, the five images are sharp. Furthermore, the distance between the head 10 and the recording paper 1 can be set relatively long. By making the backup roller 39 a knife-shaped conductor, the electric field is concentrated at its edges, further increasing its effectiveness.

Further, in the above embodiment, the negatively charged toner is attracted by the positive potential of the electrode 2 and accumulated on the organic semiconductor 3, but the positively charged toner is attracted by the negative potential of the electrode 2 and accumulated on the organic semiconductor. The positively charged toner may be negatively charged by irradiation with light. In this case, negatively charged toner is ejected.

〔Effect of the invention〕

According to the present invention, charging electrodes, deflection electrodes, and gutter outside the head are omitted, and high-density dot recording can be performed in the recording line direction, and clogging is less likely to occur.

Since the jetted liquid is not an ink containing a coloring material dissolved in a solvent, but a developer containing a carrier and image forming particles mixed therein, a clear recorded image without bleeding or blurring can be obtained. Further, 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 performed 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 a perspective view schematically 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 1--2. FIG. 3 is an enlarged sectional view of a portion indicated by a rectangle (■) with two-dot chain lines in FIG. 2.6 FIG. 4a is a plan view showing the molecular structure of the components of the organic semiconductor 3 shown in FIG. 4b and 4c are plan views showing the molecular structures of components contained in the developer used in the recording apparatus shown in FIG. 1. FIG. FIG. 5 is a flowchart showing the relationship between laser exposure scanning and hydraulic vibration applied by the vibrator 35 in the recording apparatus shown in FIG. 6a, 6b, 6c, and 6d are cross-sectional schematic diagrams showing toner charging modes in the embodiment of the present invention.6 FIG. 7 shows the toner charging mode shown in FIG. 6c. FIG. 3 is an enlarged view schematically showing how holes move from an organic semiconductor 3 to toner. 1 Nigarasu 2: Translucent Wtg (
Transparent electrode) 3: Organic semiconductor (photocharge generation layer) 4: Protective layer 6; Lower half 7: Opposed S pole (counter electrode) 8 Nislit (slit) 8a: Groove 9: Head base 9a: Light receiving slit ]0
: Recording head (developer jetting head) 118 recording paper
15: Light source 1G = first cylindrical lens 17: First mirror 18 varnish spherical lens
19: Polygon mirror 20: Motor SM: Second mirror 21: Second cylindrical lens 22: Mirror 23: Photo 1-sensor 30: Laser exposure scanning device 31: Upper half body 32: Vibration plate 33. 34: Bimorph piezo element 35 :4Hi mover (pressure means) 39; Backup roller 40:
Developer tank 4I: Developer cartridge 42: Bomb 43: Accumulator 44: Solenoid switching valve 5
0: TIA Yu liquid supply device 51: Power supply circuit 52
: Excitation circuit 54: Developer chamber (flow path)

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 developer jet head comprising a horizontally extending counter electrode and a photocharge generation layer, and a translucent electrode formed on a surface of the photocharge generation layer opposite to the surface facing the counter electrode. A developing solution in which image forming particles are mixed with a carrier liquid is supplied to the flow path, and a voltage of a predetermined polarity is applied between the transparent electrode and the counter electrode to cause the image forming particles in the developing solution to be exposed to light. The photocharge generation layer is attracted to the photocharge generation layer, and the photocharge generation layer is irradiated with light corresponding to the image to be recorded to laterally generate charges corresponding to the image and having the same polarity as the polarity of the light-transmitting electrode in the developer. An image recording method by exposure, wherein the liquid in the flow path is ejected from the slit by the pressurizing means while the charged image forming particles are attracted to a counter electrode.