JPH05197252A - Three-color image recording method and recorder therefor - Google Patents

Abstract

PURPOSE:To simplify an exposure process and to simply and surely obtain a multicolor image without color deviation by making two photoconductive layers on a composite photosensitive body to be in a specified electrostatic charging state. CONSTITUTION:The 1st photoconductive layer 1A and the 2nd photoconductive layer 1B of the composite photosensitive body 10 are electrified in opposite charged state to each other and also with a nearly same potential on an electrifying stage, and the part of the 2nd photoconductive layer 1B where an alpha-color picture element is formed is made to be electrified with, for example -X (X is an optical value) V on a 1st developing stage, and also, the part of the 1st photoconductive layer 1A where the alpha-color picture element is formed is made to be electrified with OV. The part of the 2nd photoconductive layer 1B where the beta-color picture element is formed is made to be electrified with, for example OV, and also, the part of the 1st photoconductive layer 1A where the beta-color picture element is formed is made to be electrified with 1/2XV. The part of the 2nd photoconductive layer 1B where gamma-color picture element is formed is made to be electrified with, for example -XV, and also, the part of the 1st photoconductive layer 1A where the gamma-color picture element is formed is made to be electrified with +XV.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a three-color image recording method and a three-color image recording method.
The present invention relates to a color image recording device.

[0002]

2. Description of the Related Art Various methods have been proposed for recording a three-color image by writing with light on a photoconductive photoconductor.

[0003]

However, in the method proposed hitherto, a drum-shaped or belt-shaped photosensitive member makes one revolution as in the method disclosed in Japanese Patent Laid-Open No. 60-15653. In this system, charging, writing, and developing are repeated three times, and the writing device
However, there is a problem in that the cost of the implementing device is high because of the necessity of the basic equipment, and the degree of freedom in layout of the device design is low.

Further, there is a problem that misalignment is likely to occur between images of different colors and that a page memory for the images is required because the writing position is different. Furthermore, with personal printers, it is necessary for the user to be able to perform maintenance by themselves, and in order to do so, each device that composes the printer must be made into a magazine, but if there are three writing (exposure) positions, it must be made into a magazine. Becomes almost impossible.

[0005]

[Means for Solving the Problems]

According to the first aspect of the present invention, the first photoconductive layer and the second photoconductive layer are arranged on the conductive substrate with the second photoconductive layer on the upper side, and the second photoconductive layer is formed. A composite photoconductor that is adjusted so that it is made conductive only by A-color light and transmits B-color light and that the first photoconductive layer is made conductive only by B-color light is used. A charging step of charging the second photoconductive layer in opposite directions and at substantially the same potential, an A-color light whose light intensity can be switched between "strong" and "0", and light intensity of "strong" and "weak" And B color light that can be switched to “0” are used, and the composite photoconductor is made to correspond to each pixel of α color, β color, γ color, and white, α color: A color light intensity; strong, B color light intensity. 0 β color: A color light intensity; weak, B color light intensity; strong γ color: A color light intensity; 0, B color light intensity; 0 White: A color light intensity; strong, B color light intensity; strong intensity combination A first exposure step of exposing to form an electrostatic latent image, an electrostatic latent image corresponding to an α color image with α color toner, and an electrostatic latent image corresponding to a β color image with β color toner, A first developing step of making a visible image, and after the first developing step,
A second exposure step of uniformly exposing the composite photoconductor with A color light intensity; strong, B color light intensity; weak exposure light; and, after the second exposure step, an electrostatic latent image corresponding to a γ color image. Is a three-color image recording method including a second developing step for making a visible image with γ-color toner, and a step of transferring and fixing the three-color toner image obtained on the composite photoconductor onto a transfer paper. ..

According to a second aspect of the present invention, the first photoconductive layer and the second photoconductive layer are arranged on the conductive substrate with the second photoconductive layer on the upper side, and the second photoconductive layer is formed. A composite photoconductor adjusted to be a conductor by only the A color light and transmitting the B color light, and the first photoconductive layer is made to be a conductor only by the B color light; and the first photoconductive layer and the first photoconductive layer. Charging means for charging the two photoconductive layers in opposite directions and at substantially the same potential, and A-color light irradiation means capable of irradiating the composite photoconductor with A-color light and switching the light intensity between "strong" and "0". And B color light irradiating means capable of irradiating the composite photoconductor with B color light and switching the light intensity between “strong”, “weak” and “0”, and an electrostatic latent image formed on the composite photoconductor. Supplying α-color toner to visualize image α
A color developing device, a β color developing device that supplies β color toner to the electrostatic latent image formed on the composite photoconductor to visualize it, and a γ color on the electrostatic latent image formed on the composite photoconductor. A γ-color developing device that supplies toner to form a visible image, a transfer unit that transfers the toner image obtained on the composite photoconductor onto a transfer paper, and a fixing device that fixes the toner image transferred onto the transfer paper. It is a three-color image recording apparatus having

The invention of claim 3 relates to claim 1 and claim 2.
In the step 1, after the second exposure step, when the electrostatic latent image corresponding to the γ color image is visualized with the γ color toner, the γ color image is formed on the composite photoconductor. Is a three-color image recording method in which a second developing step is performed by applying a bias voltage so that the absolute value of the potential of the electrostatic latent image corresponding to is increased.

According to the invention of claim 4, in claim 3,
It is a three-color image developing device having a bias voltage applying means for applying a bias voltage between at least one of the color developing device, the β developing device and the γ developing device and the composite photoconductor.

According to a fifth aspect of the present invention, the first photoconductive layer and the second photoconductive layer are arranged on the conductive substrate with the second photoconductive layer on the upper side, and the second photoconductive layer is formed. A composite photoconductor which is made conductive only by A-color light, partially transmits A-color light, and further transmits B-color light, and the first photoconductive layer is adjusted to be made conductive by A-color light and B-color light. And a charging step of charging the first photoconductive layer and the second photoconductive layer in opposite directions and at substantially the same potential, and A color light whose light intensity can be switched between “strong” and “0”. , And a B color light whose light intensity can be switched between “strong” and “0” are used, and the above-mentioned composite photoconductor is changed to α color: A color light corresponding to each pixel of α color, β color, γ color, and white. Intensity; strong, B color light intensity; 0 β color: A color light intensity; 0, B color light intensity; strong γ color: A color light intensity; 0, B color light intensity; 0 White: A color light intensity; strong, B color light Intensity: The first exposure step of forming an electrostatic latent image by exposing with a combination of strong intensities, and the electrostatic latent image corresponding to the α-color image with the α-color toner, and the electrostatic latent image corresponding to the β-color image After the first developing step of visualizing the image with the β-color toner and the first developing step,
A second exposure step of uniformly exposing the composite photoconductor with an exposure light of high intensity of A-color light; and after the second exposure step, an electrostatic latent image corresponding to a γ-color image can be transferred with γ-color toner. A three-color image recording method having a second developing step of visualizing and a step of transferring and fixing the three-color toner image obtained on the composite photoconductor onto a transfer paper.

According to a sixth aspect of the present invention, the first photoconductive layer and the second photoconductive layer are arranged on the conductive substrate with the second photoconductive layer on the upper side, and the second photoconductive layer is formed. A composite photoconductor which is made conductive only by A-color light, partially transmits A-color light, and further transmits B-color light, and the first photoconductive layer is adjusted to be made conductive by A-color light and B-color light. And charging means for charging the first photoconductive layer and the second photoconductive layer in opposite directions and at substantially the same potential, and the color A light can be irradiated to the composite photoconductor, and the light intensity is set to "strong". A color light irradiating means capable of switching to “0”, B color light irradiating means capable of irradiating the composite photoconductor with B color light, and capable of switching the light intensity among “strong”, “weak” and “0”, An α-color developing device that supplies α-color toner to the electrostatic latent image formed on the photoconductor to make it a visible image, and the α-color developing device formed on the composite photoconductor. A β-color developing device for supplying β-color toner to the electrostatic latent image to make it visible, and a γ-color developing for supplying γ-color toner to the electrostatic latent image formed on the composite photoconductor to make it visible A three-color image recording apparatus including an apparatus, a transfer unit that transfers the toner image obtained on the composite photoconductor onto a transfer sheet, and a fixing apparatus that fixes the toner image transferred onto the transfer sheet.

[0012]

According to the first and fifth aspects of the invention, the first photoconductive layer and the second photoconductive layer of the composite photoconductor are charged in opposite directions and at substantially the same potential by the charging step, and the first development is performed. By the process, the second photoconductive layer in the portion where the α color pixel is formed is charged to, for example, −X (X is an arbitrary value) V,
Further, the first photoconductive layer in the portion where the α-color pixel is formed is 0V.
It becomes a charged state. The second photoconductive layer in the portion where the β-color pixel is formed is charged to, for example, 0 V, and β
The first photoconductive layer in the portion where the color pixel is formed is 1/2 XV
It becomes a charged state.

The second photoconductive layer in the portion where the γ-color pixel is formed is charged to, for example, −XV, and the first photoconductive layer in the portion where the γ-color pixel is formed is charged to + XV. It becomes a state. The second photoconductive layer in the white portion is charged to 0 V, for example, and the first photoconductive layer in the portion where the pixels in the white portion are formed is formed.
The photoconductive layer is charged to 0V.

Then, in the first development step, the electrostatic latent image corresponding to the α-color image is visualized with the α-color toner, and the electrostatic latent image corresponding to the β-color image is visualized with the β-color toner. After the first developing step, the second exposure step causes the second photoconductive layer in the portion where the α-color pixel is formed to be charged to, for example, −¼XV, and the α-color pixel is formed. The portion of the first photoconductive layer to be exposed is charged to 0V. The second photoconductive layer in the portion where the β-color pixel is formed is charged to 0V, for example, and the first photoconductive layer in the portion where the β-color pixel is formed is charged to 0V.

The second photoconductive layer in the portion where the γ-color pixel is formed is charged to 0V, for example, and the first photoconductive layer in the portion where the γ-color pixel is formed is charged to + 1 / 2XV. It will be in the state of doing. The second photoconductive layer in the white portion is charged to 0V, for example, and the first photoconductive layer in the portion where the pixels in the white portion are formed is charged to 0V. By the second developing step, the electrostatic latent image corresponding to the γ-color image is visualized with the γ-color toner. Next, the three-color toner image obtained on the composite photoconductor is transferred and fixed on the transfer paper.

In the invention of claim 2, the inventions of claims 1 and 2 can be implemented. According to the invention of claim 3, in the second developing step according to claim 1 or 6,
Since the bias voltage is applied to the composite photoconductor, the absolute value of the potential of the electrostatic latent image corresponding to the γ-color image becomes large. In the invention of claim 4, the invention of claim 4 can be implemented. In the invention of claim 6, the invention of claim 6 can be implemented.

[0017]

EXAMPLES Examples of the present invention will be described below. A first embodiment corresponding to the inventions of claims 1 and 2 will be described. A composite photoconductor as shown in FIG. 3 (1) was manufactured as a prototype. The first photoconductive layer 1A formed on the conductive substrate 1K is a function-separated type and has a carrier transport layer 1A1 and a carrier generation layer 1A2 laminated. Further, an intermediate layer 1C is formed between the first photoconductive layer 1A and the second photoconductive layer 1B.

This composite photoreceptor was formed as follows. As the conductive substrate 1K, A1 is formed on the surface of the resin film.
The thing which vapor-deposited the layer was used. First, the carrier transport layer 1A1 was formed on the conductive substrate 1K. This carrier generation layer 1A1 is composed of α-phenyl 4-N, N-diphenylaminostilbene, polycarbonate resin, silicone oil, cyclohexane and T having the structure shown in FIG.
Disperse in a mixed solvent with HF and spray coat.
A film having a thickness of 21 μm was formed by drying at 0 ° C. for 20 minutes.

Next, on the carrier transport layer 1A1,
As the carrier generation layer 1A2, a liquid in which a trisazo pigment having a structural formula as shown in FIG. 3 (3) and polyvinyl butyral resin are dispersed in a mixed solvent of cyclohexane and MEK is spray-coated and dried at 120 ° C. for 30 minutes. It was formed to 3 μm. A liquid obtained by dispersing a polyamide resin as a mid layer 1C in a mixed solvent of methanol and n-butanol was spray-coated on the intermediate layer 1C at 120 ° C.
It was dried for 0 minutes to form a film having a thickness of 0.6 μm.

Finally, as the second photoconductive layer 1B, a microcrystal dispersion type OPC layer was formed to a thickness of 35 μm. The second photoconductive layer 1B was prepared by dispersing thiapyrylium salt, triphenylmethane, and polycarbonate in a mixed solvent of methylene chloride and 1,1,2 trichloroethane, and further prepared by a dipping method to obtain a normal microcrystalline dispersion type. It was formed by spray-coating the solution added with OPC and drying at 120 ° for 20 minutes. The spectral transmittance of the photoconductive layer 1B can be adjusted by adjusting the addition amount of the fine crystal dispersion type OPC.

The second photoconductive layer 1B absorbs almost all the light having a wavelength of 670 nm to 680 nm as the A-color light, and has a wavelength of 6
Shows high photosensitivity to light from 70 nm to 680 nm,
Most of the B color light having a wavelength of 780 nm is transmitted, and there is no photosensitivity to the light having a wavelength of 780 nm. The spectral transmittance of the second photoconductive layer 1B is shown by the solid line in FIG. 4, and the spectral sensitivity is shown in FIG. The first photoconductive layer 1A has a wavelength of 780
It exhibits high photosensitivity to nm light. The photoconductive layer 1B has photosensitivity to positive charging and negative charging, and the photoconductive layer 1A has photosensitivity to positive charging.

The composite photoconductor 10 is formed in a belt shape,
The image recording apparatus shown in FIG. 6 was constructed. Around the photoconductor 10, a charging device 50 having a quenching lamp 30, a charger 50b and a red LED 50a for irradiating light having a wavelength of 670 nm, a charger 14, an optical writing device 16, a black toner developing device 18, a red toner developing device. 20,
A uniform exposure device 51 including a lamp 22 and a filter 221, a blue toner developing device 24, a pre-transfer charger 26, and a cleaning device 28 are arranged. Each of the black toner developing device 18, the red toner developing device 20, and the blue toner developing device 24 is a two-component developing device, and is a device of a system in which a developer brush is brought into contact with the photoconductor 10 to perform development. The optical writing device 16 outputs laser light having a wavelength of 680 nm and a laser light having a wavelength of 780 nm to 0, 0.5, (weak) 1.0.
Irradiation can be performed by changing the light intensity to three levels of (strong).

Reference numeral 32 indicates a transfer belt, which is driven in the direction indicated by the arrow. Transfer belt 32
Surrounding the area is a charger 34 and a separation charger 4
0, a static eliminator 36, and a cleaner 38 are arranged. A transfer charger 33 is provided inside the transfer belt 32. Reference numeral 42 indicates a fixing device.

Next, the operation of the image forming apparatus shown in FIG. 6 will be described. The primary charging step will be described. While rotating the composite photoconductor 10 clockwise, the quenching lamp 3
0 to remove light statically, and then the red LED 50a of the charging device 50 irradiates light with a wavelength of 670 nm to perform uniform exposure, while the charger 50a adds +6.
Discharge is performed at 0 KV, and the first photoconductive layer 1A is charged to +1600 V as shown in FIG. 1 (1).

The secondary charging step will be described. In the dark, the charger 14 discharges at -4.7 KV, and as shown in FIG. 1 (2), the second photoconductive layer 1B is discharged.
Is charged to −800 V, the first photoconductive layer 1A is charged to +800 V, and the surface potential of the entire photoconductor 10 is set to 0 V. First
The exposure step will be described. As shown in FIG. 1C, the optical writing device performs exposure with a combination of laser outputs shown in FIG. 7, and the second photoconductive layer 1B and the first photoconductive layer 1A are exposed as shown in FIG. Get charged.

The first developing step will be described. Figure 1
As shown in (4), by the black toner developing device 18,
The black toner Ta charged in the positive polarity is supplied to the electrostatic latent image corresponding to the black image to develop the black image, and the red toner developing device 20 corresponds the red toner Tb charged in the negative polarity to the red image. Then, the red latent image is developed to develop the red image. The second exposure process will be described. The uniform exposure device 51 irradiates the photoconductor 10 with red light (light having a wavelength of 680 nm) and weak near-infrared light (light having a wavelength of 780 nm) to perform uniform exposure.
The state is as shown in (5).

When uniform exposure is carried out, the potential of the second photoconductive layer 1B which is made into a conductor by red light becomes 0V, but the light is blocked to some extent in the black image portion, so -200V.
It will maintain some degree of charge. The positive charge of the first photoconductive layer 1A which is made into a conductor by near infrared light is about 400V.
Disappear. As a result, the red image portion has a voltage of approximately 0V, and the electrostatic latent image portion corresponding to the blue image portion has a voltage of approximately + 400V. In the red image area, the red toner Tb scatters and transmits near-infrared light, so that the charges below the red image area disappear. FIG. 8 shows the state of each color image portion after uniform exposure.

The second developing step will be described. Figure 2
As shown in (6), by the blue toner developing device 20,
The blue toner Tc charged to the negative polarity is supplied to the electrostatic latent image corresponding to the blue image, and the blue image is developed. Then, as shown in FIG. 2 (7), the pre-transfer charger 26
The corona discharge of the positive electrode is performed to reverse the polarities of the red toner Tb and the blue toner Tc on the photoconductor 10 to have a positive polarity.

The transfer and fixing steps will be described. After the transfer paper S is adsorbed to the transfer belt 32 by the charger 34 and conveyed, the toner image is transferred by the transfer charger 33, separated from the transfer belt 32 by the separation charger 40, and the three-color image is fixed by the fixing device 42. , Discharged outside the device. The residual toner is removed from the composite photoconductor 10 after the transfer of the visible image by the cleaning device 28.

The transfer belt 36 is neutralized by the static eliminator 36 and cleaned by the cleaner 38. The transfer of the transfer paper S can be switched back by the transfer belt 32 and the transfer can be repeated a plurality of times. By using this, it is possible to record a mixed color image of red and blue.

In the first embodiment, the filter 221 of the uniform exposure apparatus 50 has a complicated structure and requires an expensive multilayer film filter in order to obtain a predetermined spectral transmittance. In the second exposure step, the potential of the second photoconductive layer 1B corresponding to the red image is changed from + 400V to 0V, and the potential of the second photoconductive layer 1B corresponding to the blue image is + 800V.
There is a problem that it is difficult to control from + 400V to + 400V. This is because the control width of the light quantity (output) of the laser light is narrow.

The inventions of claims 3 and 4 are intended to solve the above problems, and the second photoconductive layer 1 of the first embodiment is used.
By improving the process of erasing the negative polarity charge of B, the margin of the uniform exposure amount in the second exposure process is greatly increased, and an inexpensive red (light having a wavelength of 670 nm) LED array is used as a light source for uniform exposure. It is intended for use.

Second aspect corresponding to the inventions of claim 3 and claim 4
Examples will be described. FIG. 9 shows an apparatus according to the second embodiment. Since the device according to the second embodiment has substantially the same configuration as the device according to the second embodiment, parts having the same structures as those of the device according to the first embodiment are designated by the same reference numerals as those in the first embodiment. And description thereof will be omitted. In FIG. 9, reference numeral 60 indicates a red LED array, and the red LED array 60 irradiates the photoconductor 10 with light of 670 nm. Second
FIG. 4 shows the spectral transmittance of the second photoconductive layer 1B according to the example.
The spectral sensitivity is shown in the graph represented by the alternate long and short dash line in FIG.

Next, the operation of the image forming apparatus shown in FIG. 9 will be described. Description of the same operation as that of the image forming apparatus in FIG. 6 is omitted. The second exposure process will be described. Red L
The ED 60 irradiates the photoconductor 10 with red light to perform uniform exposure, and the state shown in FIG. 2 (5) is obtained.

When uniform exposure is carried out, the potential of the second photoconductive layer 1B made into a conductor by red light becomes 0V, but
In the black image area, light is blocked to some extent, so -200
The charge of about V will be maintained. Also, the first photoconductive layer 1
Since it is not made conductive by the red light of A, most of the positive charges of the first photoconductive layer 1A remain undisappeared. As a result, the red image portion has a voltage of approximately + 400V, and the electrostatic latent image portion corresponding to the blue image portion has a voltage of approximately + 800V. The state of each color image portion after uniform exposure is shown in FIG.

According to the present embodiment, even if the light emission amount of the first photoconductive layer layer of the photoconductor or the red LED array varies from product to product, a good image without color mixture, low image density, etc. is always obtained. You will be able to get it. Further, since it is not necessary to use the multilayer filter, the manufacturing cost can be reduced to about 1000 to 2000 yen.

In the first and second embodiments, the wavelength 780 is used.
nm laser light output is 0, weak (0.5), strong (1.
Since it is used in 3 values of 0), it is used as an image memory.
Bit things are needed. The output of the laser light is 0,
When using a binary value of strong (1.0), a 2-bit image memory can be used. Further, when the laser light has three values, the laser output adjusting device becomes complicated. The embodiments corresponding to the inventions of claims 5 and 6 are not limited to laser light having a wavelength of 680 nm,
A laser beam having a wavelength of 780 nm can also be used in binary. Further, in the present invention, as in the second embodiment, it is sufficient to use only the LED that emits light having a wavelength of 670 nm in the uniform exposure process.

Next, a third embodiment corresponding to the inventions of claims 5 and 6 will be described. FIG. 11 shows an apparatus according to the third embodiment. Since the device according to the third embodiment has substantially the same configuration as the device according to the second embodiment, parts having the same structures as those of the device according to the second embodiment are designated by the same reference numerals as those in the second embodiment. And description thereof will be omitted. Figure 1
In FIG. 1 and FIG. 12, reference numeral 101 denotes a photoconductor, and the second photoconductive layer 1B3 of the photoconductor 101 absorbs about 70% of light having a wavelength of 680 nm and exhibits photosensitivity to light having a wavelength of 680 nm. Further, the second photoconductive layer 1B3 almost transmits light having a wavelength of 780 nm, and has no sensitivity to light having a wavelength of 780 nm.

Reference numeral 76 indicates an optical writing device, which can emit laser light having a wavelength of 680 nm and a wavelength of 780 nm by changing the light intensity in two stages of 0 and 1.0. Next, the operation of the image forming apparatus in FIG. 11 will be described. Description of the same operation as that of the image forming apparatus in FIG. 6 is omitted. The first exposure step will be described. Figure 1
As shown in (3), the optical writing device performs exposure with a combination of laser outputs shown in FIG. 13, and the second photoconductive layer 1B3 and the first photoconductive layer 1A3 are charged as shown in FIG. .. As described above, the first photoconductive layer 1A3
Has photosensitivity to light having a wavelength of 680 nm, the second
About 30% of the irradiation light that has passed through the photoconductive layer 1B3 of FIG. 2 reduces the potential from + 800V to + 400V.

The other steps are the same as those in the second embodiment.
The potentials of the second photoconductive layer 1B3 and the first photoconductive layer 1A1 after the exposure process, that is, the uniform exposure are the same as those of the first embodiment shown in FIG. In this embodiment, the image memory can be halved, and a circuit for controlling the ternary output of laser light is unnecessary. Moreover, the multilayer filter is not necessary. Therefore, the manufacturing cost of the image forming apparatus can be reduced by about several thousand yen.

[0041]

As described above, according to the present invention, the exposure process can be simplified and a multicolor image without color misregistration can be easily and surely obtained. Further, the degree of freedom of layout of each device forming the image forming apparatus is widened, and the devices forming the image forming apparatus can be made into a magazine.

[Brief description of drawings]

FIG. 1 is a diagram showing an image form recording method according to an embodiment of the present invention in process order.

FIG. 2 is a diagram showing an image form recording method according to an embodiment of the present invention in process order.

FIG. 3 is a diagram showing a structure of a composite photoconductor and a structural formula of materials constituting the photoconductor according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a spectral transmittance of a second photoconductive layer.

FIG. 5 is a diagram showing the spectral sensitivity of a second photoconductive layer.

FIG. 6 is a diagram showing a configuration of an image recording apparatus according to a first embodiment of the present invention.

FIG. 7 is a table showing the laser light output in the first exposure process and the potential state of the photoconductor after the first exposure process of the image recording apparatus according to the first embodiment.

FIG. 8 is a diagram showing a configuration of an image recording apparatus according to a second embodiment of the present invention.

FIG. 9 is a table showing a toner adhesion state of the image recording apparatus according to the first example and a state of a potential of the photoconductor after completion of the second exposure process.

FIG. 10 is a table showing a toner adhesion state of the image recording apparatus according to the second example and a state of the potential of the photoconductor after the second exposure process.

FIG. 11 is a view showing the arrangement of an image recording apparatus according to the third embodiment of the present invention.

FIG. 12 is a diagram showing a configuration of a photoconductor of an image recording apparatus according to a third embodiment.

FIG. 13 is a table showing a toner adhesion state of the image recording apparatus according to the third example and a state of the potential of the photoconductor after the second exposure process.

[Explanation of symbols]

 10 Photoconductor 101 Photoconductor 1A First photoconductive layer 1B Second photoconductive layer 1A1 First photoconductive layer 1B1 Second photoconductive layer 16 Optical writing device 76 Optical writing device 18 Black toner developing device 20 Red toner developing device 24 Blue Toner development device

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[Procedure amendment]

[Submission date] February 5, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a diagram showing an image form recording method according to an embodiment of the present invention in process order.

FIG. 2 is a diagram showing an image form recording method according to an embodiment of the present invention in process order.

FIG. 3 is a diagram showing a structure of a composite photoconductor and a structural formula of materials constituting the photoconductor according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a spectral transmittance of a second photoconductive layer.

FIG. 5 is a diagram showing the spectral sensitivity of a second photoconductive layer.

FIG. 6 is a diagram showing a configuration of an image recording apparatus according to a first embodiment of the present invention.

FIG. 7 is a chart showing a laser beam output in a first exposure process of the image recording apparatus according to the first example and a state of a potential of the photoconductor after the completion of the first exposure process.

FIG. 8 is a diagram showing a configuration of an image recording apparatus according to a second embodiment of the present invention.

FIG. 9 is a chart showing a toner adhesion state of the image recording apparatus according to the first example and a state of a potential of the photoconductor after completion of the second exposure process.

FIG. 10 is a chart showing a toner adhesion state of the image recording apparatus according to the second example and a state of a potential of the photoconductor after the second exposure process.

FIG. 11 is a view showing the arrangement of an image recording apparatus according to the third embodiment of the present invention.

FIG. 12 is a diagram showing a configuration of a photoconductor of an image recording apparatus according to a third embodiment.

FIG. 13 is a chart showing a toner adhesion state of the image recording apparatus according to the third example and a state of a potential of the photoconductor after the second exposure process.

DESCRIPTION OF SYMBOLS 10 Photoconductor 101 Photoconductor 1A First photoconductive layer 1B Second photoconductive layer 1A1 First photoconductive layer 1B1 Second photoconductive layer 16 Optical writing device 76 Optical writing device 18 Black toner developing device 20 Red Toner developing device 24 Blue toner developing device

Claims (6)

[Claims] 1. A first photoconductive layer and a second photoconductive layer are arranged on a conductive substrate with the second photoconductive layer facing upward, and the second photoconductive layer is conductive by only A color light. The first photoconductive layer and the second photoconductive layer are formed by using a composite photoconductor that is embodied and transmits B color light, and the first photoconductive layer is adjusted to be a conductor only by B color light. A charging step of charging the layers in opposite directions and at substantially the same potential, A-color light that can switch the light intensity between “strong” and “0”, and light intensity of “strong”, “weak”, and “0” And B color light that can be switched to, corresponding to each pixel of α color, β color, γ color, and white,
Α color: A color light intensity; strong, B color light intensity; 0 β color: A color light intensity; weak, B color light intensity; strong γ color: A color light intensity; 0, B color light intensity; 0 White: The first exposure step of forming an electrostatic latent image by exposing with a combination of A color light intensity: strong and B color light intensity: strong, and an electrostatic latent image corresponding to an α color image with an α color toner First to visualize an electrostatic latent image corresponding to a color image with β-color toner
And a second exposure step of uniformly exposing the composite photoconductor after the first development step with exposure light of A color light intensity; strong, B color light intensity; weak exposure light; After the step, a second developing step of visualizing the electrostatic latent image corresponding to the γ-color image with the γ-color toner, and transferring the three-color toner image obtained on the composite photoconductor onto a transfer paper, A three-color image recording method including a fixing step. 2. A first photoconductive layer and a second photoconductive layer are disposed on a conductive substrate, and a second photoconductive layer is arranged on the upper side, and the second photoconductive layer is conductive only by A color light. A composite photoconductor that is embodied and transmits B color light, and the first photoconductive layer is adjusted to be a conductor only by B color light; and the first photoconductive layer and the second photoconductive layer. And a charging means for charging the above-mentioned composite photoconductors in opposite directions and at substantially the same potential, and the light intensity is "strong".
A color light irradiating means that can be switched between “0” and “0”, and B color light can be irradiated to the composite photoconductor, and the light intensity is “strong” and “weak”.
B light irradiating means that can be switched between "0" and "0", an .alpha. Color developing device that supplies .alpha. Color toner to the electrostatic latent image formed on the composite photoconductor to make it a visible image, and forms on the composite photoconductor. Β to form a visible image by supplying β color toner to the formed electrostatic latent image
A color developing device, a γ-color developing device that supplies γ-color toner to the electrostatic latent image formed on the composite photoconductor to make it visible, and a toner image obtained on the composite photoconductor on a transfer paper. A three-color image recording apparatus having a transfer means for transferring and a fixing device for fixing the toner image transferred on the transfer paper. 3. The electrostatic latent image corresponding to the γ-color image is visualized with the γ-color toner after the second exposure step according to claim 1 or 2. A three-color image recording method in which a second developing step is performed by applying a bias voltage to the composite photoconductor so that the absolute value of the potential of the electrostatic latent image corresponding to the γ-color image becomes large when the image is formed. 4. The bias voltage applying means for applying a bias voltage between at least one of the α-color developing device, the β-color developing device, and the γ-color developing device and the composite photoconductor according to claim 3. A three-color image developing device equipped. 5. A first photoconductive layer and a second photoconductive layer are arranged on a conductive substrate, and a second photoconductive layer is arranged on the upper side, and the second photoconductive layer is conductive only by A color light. The composite photoconductor is embodied and partially transmits the A color light, and further transmits the B color light, and the first photoconductive layer is a composite photoconductor adjusted so as to be made conductive by the A color light and the B color light. A charging step of charging the first photoconductive layer and the second photoconductive layer in opposite directions and at substantially the same potential, A color light capable of switching the light intensity between "strong" and "0", and the light intensity of " Using the B color light that can be switched between “strong” and “0”, the above-described composite photoconductor is made to correspond to each pixel of α color, β color, γ color, and white, α color: A color light intensity; strong, B Color light intensity; 0 β color: A color light intensity; 0, B color light intensity; strong γ color: A color light intensity; 0, B color light intensity; 0 White: A color light intensity; strong, B color light intensity; The first exposure step in which the electrostatic latent image corresponding to the α-color image is formed by using the α-color toner, and the electrostatic latent image corresponding to the β-color image is formed by the β-color toner Then, the first to visualize
And a second exposure step of uniformly exposing the composite photoconductor with A color light intensity; strong exposure light after the first development step, and a γ color after the second exposure step. It has a second developing step of making an electrostatic latent image corresponding to an image visible with γ-color toner, and a step of transferring and fixing the three-color toner image obtained on the composite photoconductor onto a transfer paper. Three-color image recording method. 6. A first photoconductive layer and a second photoconductive layer are arranged on a conductive substrate, and a second photoconductive layer is arranged on the upper side, and the second photoconductive layer is conductive only by A-color light. A composite photoconductor that is embodied and partially transmits A-color light, and further transmits B-color light, and the first photoconductive layer is adjusted to be a conductor by A-color light and B-color light; Charging means for charging the photoconductive layer and the second photoconductive layer in the opposite directions to each other at substantially the same potential, and the composite photoconductor can be irradiated with the color A light.
A color light irradiating means that can be switched between “0” and “0”, and B color light can be irradiated to the composite photoconductor, and the light intensity is “strong” and “weak”.
B light irradiating means that can be switched between "0" and "0", an .alpha. Color developing device that supplies .alpha. Color toner to the electrostatic latent image formed on the composite photoconductor to make it a visible image, and forms on the composite photoconductor. Β to form a visible image by supplying β color toner to the formed electrostatic latent image
A color developing device, a γ-color developing device that supplies γ-color toner to the electrostatic latent image formed on the composite photoconductor to make it visible, and a toner image obtained on the composite photoconductor on a transfer paper. A three-color image recording apparatus having a transfer means for transferring and a fixing device for fixing the toner image transferred on the transfer paper.