JPS63132264A - Color image forming device - Google Patents

Abstract

PURPOSE:To easily reproduce colors and to obtain an excellent image without a color smear by providing a photosensitive body forming an image carrier with a photosensitive material layer and a color filter layer formed to freely peel off the photosensitive material layer. CONSTITUTION:A photosensitive body 5 is provided with the photosensitive material layer 2, and a transmissive insulating body having color filters 3 which are provided so as to peel off from the photosensitive material layer 2. The transmissive insulating body of the photosensitive body 5 is uniformly electrified. The uniformly electrified photosensitive body is destaticized simultaneously with the original optical image is projected to the photosensitive body 2 side from the transmissive insulating body side to form a latent image on the surface of the transmissive insulating body. The latent image is developed with a nontransmissive particle. In the filter layer 3, the nontransmissive particle 11 does not attach to the place on which a red 3R, a green 3G and a blue 3B are made incident, whereas the particle 11 attaches to the place on which no color is made incident. Thus whether light is blocked or transmitted is selected, and a sharp color image is obtained on a screen.

Description

Detailed Description of the Invention: -1) The present invention relates to an electrophotographic color image forming apparatus, and in particular, a color image is directly formed by attaching non-transparent fine particles to an image carrier such as a photoreceptor. The present invention relates to an electrophotographic color image forming apparatus.

'bi1. ``Various types of electrophotographic color image forming devices have been proposed in the past, but the most representative one is an electrophotographic photoreceptor.''
Second, multiple types of color filter particles are uniformly scattered, light from the original is applied to the photoreceptor through the color filter for exposure, the non-banded 1L particles are removed, and the remaining particles remaining on the photoreceptor are transferred. There is a method of obtaining a color image by transferring it to paper. However, this method requires complicated steps and has problems in terms of color reproduction, fogging, etc., and has not been put to practical use yet.

On the other hand, the general electrophotographic color image forming bag that is currently commercialized uses the Carlson process to separate the original image into each color, and then prints each color onto an electrophotographic photoreceptor using the Shigeko photography method. There is a method of obtaining a color image by forming a latent image, developing the latent image with toner particles, and transferring the image particles of each color onto a transfer material in a plurality of layers. Such a method has problems such as complicated steps, a tendency to cause color misregistration due to multiple transfers, and an increase in the size of the apparatus.

"Double Color and Gloss" An object of the present invention is to provide a color image forming apparatus that has a simple process and is capable of obtaining images of good quality without causing color reproduction, color shift, etc.

The above object is achieved by the color image forming apparatus according to Part 4. In summary, the present invention provides a photoreceptor including a photosensitive material layer, a light-transmitting insulator that is removably provided to the photosensitive material layer and has color filters of a plurality of colors; Is the translucent insulator side uniform? i? Electrifying band';
an exposure/discharge means for irradiating the uniformly charged photoreceptor with an original optical image from the light-transmitting insulator side to the photosensitive material layer side and simultaneously removing the charge; A color characterized by comprising: a full-surface exposure unit that performs exposure to form a latent image on the surface of the translucent insulator; and a developing unit that develops the latent image on the translucent insulator with non-transparent particles. It is an image forming apparatus.

Example 1 Next, the color image forming apparatus according to the present invention will be explained in more detail with reference to the drawings.

First, the principle of the image forming method of the electrophotographic color image forming apparatus according to the present invention will be explained with reference to FIGS. 1 to 3.

An image carrier used in the image forming apparatus according to the present invention,
That is, the electrophotographic photoreceptor 5 includes at least a conductive substrate 1, a photosensitive material layer 2, and a light-transmitting insulating color filter layer 3 of a plurality of colors.
In this embodiment, the photoreceptor 5 is composed of a conductive base l formed of a metal such as aluminum, as shown in FIG. 1(A). , and a photosensitive material layer 2 laminated on a conductive substrate l.

Furthermore, according to the present invention, the color filter layers 3 are arranged at 21 points on the photosensitive material (first layer).
Figure (B)).

The layer 2 of photosensitive material formed on the conductive substrate can be an organic photoconductor such as brominated polyvinyl carbazole, but may also be an inorganic photoconductive material such as Si, Se, PbO1a-3.
t, CdS and Si, Se, Te, As, Sb′1? An inorganic photoconductive material such as an alloy or a total compound with a thickness of 3
ZnO
, CdS, TiOz, Pbo, etc., and a mixture of an insulating binder and a thin W2 coating can also be used.

The color filter layer 3 is formed of a light-transmitting insulating material 1, and is constructed by sequentially forming red 3R, green 3G, and blue 3B at a pitch of 100 meters. For example, as shown in Figure 3, the thickness is 1006 m.
red 3R, green 3G, blue 3 with a width of 100 gm on transparent polyethylene terephthalate (PET) film 3a.
It is formed by sequentially stamping the color filter group 3b consisting of B.

Further, in the above embodiment, the color filter layer 3 is formed in the form of three-color stripes as shown in FIG. It may be formed into a shape, and its shape can be changed freely.

According to the present invention, the photoreceptor 5 is uniformly electrified from the side of the color filter layer 3 using a band'+(f means 4, for example, a corona discharge device (see FIG. 1). (C), CD)), the uniformity-fi+f electric means 4 of the color filter layer 3 brings the conductive rubber roller into contact with the color filter layer 3 without using a corona discharge device, and the conductive rubber roller and the conductive base 1 This can also be achieved by applying a DC voltage between them.

Next, the photoreceptor 5 is subjected to corona removal using a static eliminator 7.
At the same time, a light image of the color original (original) is irradiated from the color filter layer 3 side.
- A latent image corresponding to the original image gj pattern is (scanned (Fig. 1 (D)'). At this time, according to Seikan IJI, red 3R is formed as a color filter on the photosensitive material layer 2.
Since 1 green 3G and blue 3B are printed, the light image from the original reaches the photosensitive material layer 2 while being decomposed by the color filter. In other words, the original red OR passes only through the red color filter 3R,
The green OG passes only through the green color filter 3G, and the blue OB passes only through the blue color filter 38, so that a latent image is formed corresponding to the original color image.

Referring to FIG. 1, the above WI image forming process will be explained only for the green 00 portion of the original optical image.
In the photoreceptor 5, which has been irradiated with a green light image along with static electricity removal in the E) process, the green OG passes only through the green color filter 3G, so the charge on the filter 3G part disappears, while the charge on the filter 3R13B part disappears. It doesn't disappear and is suddenly in the dark; 11. As a result, the surface of the photoreceptor 5 on the color filter 3 side has an electric charge as shown in FIG. 1(F)! 1 is obtained.

Next, a latent image is formed by irradiating the entire surface of the photoreceptor 5 using the lamp 8 (FIG. 1 (G)). Such a latent image forming process is the NP image forming process of the present applicant. Since this is a well-known technique to those skilled in the art, further detailed explanation will be omitted.

Next, non-transparent particles 11 are applied to the photoreceptor 5 from the color filter layer 3 side by a developing means, and the latent image is visualized (FIG. 1 (H)).The non-transparent particles 11 are obtained from Canon Sales Co., Ltd. The electronic photocopying system RL (product name ``4'') on sale
00RE") can be used. By applying the developer from the side of the color filter layer 3, non-transparent particles 11 were attached (FIG. 1(I)).

After development, the transparent insulating film, that is, the color filter layer 3, is removed from the photoreceptor 5! After drying the filter layer 3 and projecting it with a commercially available 35m/m projector, the filter layer 3 shows that the areas where the original red 3R1 green 3G and blue 3B are incident are as follows. Non-transparent particles 11 are not attached, and conversely, non-transparent particles xi are attached to areas where such colors are not incident, so that it is selected whether the particles 11 block or transmit the lamp light in the projector, and the screen A clear color image was obtained.

FIG. 4 shows an embodiment of a color image forming apparatus according to the present invention.

The photoreceptor 5 includes a drum-shaped aluminum conductive substrate 1, a photosensitive material layer 1 coated on the substrate 1, and a color filter layer 3 formed by printing a color filter on a transparent insulating film. In this embodiment, the color filter layer 3 is formed into a continuous web separate from the photosensitive drum IA, which is composed of a drum-shaped guide base l and a photosensitive material layer 2, and When loaded into the apparatus, it is wound up into a roll, and is provided on the photosensitive drum IA by winding it approximately and over the circumferential area.

When the conductive substrate 1 and the photosensitive drum IA forming the photosensitive material layer 2 move in the direction of the arrow, the color filter layer 3 forming the insulating film also moves in the same direction closely.

The insulating film 3 is uniformly charged by a corona charger 4.

Next, an AC corona discharge is performed by the static eliminator 7, and at the same time, a light image is irradiated from the original, and then a light irradiation is performed by the entire surface exposure lamp 8. As a result, the optical image is separated into the color filters 3R13G and 3B, and a latent image is formed on the photoreceptor 5.

Next, the developing means 9 applies non-transparent charged particles 11 to the surface of the photoreceptor 5, that is, the surface of the color filter layer 3, according to the latent image.

The color filter layer 3 is then peeled off from the photosensitive drum IA, and the visualized image on the filter layer 3 is fixed onto the filter layer 3 by means such as pressure, heated solvent, or the like. Of course, from the viewpoint of image performance, it is preferable that the visible image be fixed on the insulating film at the time when the filter layer 3 is peeled off from the photosensitive drum mA.

To explain Example L in more detail, the conductive substrate 1 is an aluminum drum cylinder with a diameter of 108 mm, and a Cds layer in which resin is dispersed as a photosensitive material layer 2 is coated on the drum cylinder 1 with a thickness of 40 lumen. The coating was applied to a thickness of 200 mm/sec and rotated at a circumferential speed of 200 mm/sec. The insulating color filter layer 3 was prepared by sequentially printing red, blue, and green in stripes with a width of 1100 jL on a 25 μm thick PET film.

A wire 4a made of a 10 gm diameter tungsten wire plated with 0.3 μm gold is used as the charging material 4a, and is further surrounded on three sides by conductive shield members 4b.
1 were opposed by a drum cylinder, and the distance between the drum cylinder and the wire rod 4a was 10 mm.

When a positive voltage of about 7.5 Kv was applied to this wire 4a from a high-voltage power supply, corona discharge occurred, and a surface potential of about 700 cm was obtained on the surface of the color filter layer 3.

Next, the color original is irradiated with white light and the color filter layer 3F of the photoreceptor 5 is irradiated with the light through the lens, and at the same time, a static eliminator 7, which is approximately the same as the charger 4 and has an open back, is used. Static electricity was removed. At this time, the wire 7a of the static eliminator 7
The AC power supply was used at an AC frequency of 600 Hz and an applied voltage peak value of 9 KvVp-p. Instead of causing the charger to perform AC discharge, a DC voltage with a polarity opposite to that of the charger 4 may be applied.Full surface exposure to zero-order white light (in this example, a 15W white fluorescent lamp was used) By doing this, the dark area potential became a surface potential of about 300 V, and the surface potential at the positions exposed to each color became approximately OV.

In the developing process, toner for an electrophotographic copying machine (product name R400REJ) sold by Canon Sales Co., Ltd. is uniformly distributed onto a metal sleeve 9 having a diameter of 32 mm using a fixed magnet having an internal magnetic field of 700 mm. The toner is coated with a cotton layer and applied to the photoreceptor 5 as non-transparent particles 11.
It was attached to the latent image of F. At this time, an AC frequency of 1800 Hz and an applied voltage VP are applied between the metal sleeve 9a and the photoreceptor 5.
- P1400V is applied, and the sleeve 9a and the insulator 3
A gap of approximately 300 gm was maintained between the two.

The sleeve 9a was rotated at the same speed as the photoreceptor 1 and arranged so that uniform non-transparent particles 11 were always directed toward the photoreceptor 5. The non-transparent particles 11 on the developed insulator 3 are covered with a solvent (
It was fixed with trichlene) 12. In this embodiment, trichlene vapor was used as the fixing stage, but heating and pressure fixing means may also be used.

The above-mentioned apparatus is an embodiment of the present invention, and a desired color image can be obtained with any image forming apparatus having this configuration.

For example, the visible image on the color filter layer 3 may be fixed to the color filter layer 3 by heat, force or solvent means;
For example, it is possible to tightly fix cellophane tape or the like on the color filter layer 3, or it is also possible to spray common glue or the like onto the visible image and fix the image to the color filter 2 layer 3-A. I'm going to work.

Further, in the above embodiment, the color filter layer 3 was formed in a three-color stripe shape as shown in FIG.
It may be a color filter scattered in a mosaic shape or a dot shape, or it may be one in which the stripes are formed diagonally, and the shape can be changed freely, which is called rotation.

Furthermore, in the above embodiment, the color image forming method was performed by a color separation method using three primary color filters of 2t, green, and -t, but a combination of cyan, magenta, yellow, etc. may also be used. It is also i+7 to use the color separation method of color, 4 color quantities -L.

Furthermore, the means for depositing +1 non-permeable particles on the insulator is 2.
A component-based magnetic brush method or cascade development may be used, or a liquid development means may be used.

When a liquid developing means is used, the non-transparent particles 11 are produced using an electrophotographic copying machine sold by Canon Hankai Co., Ltd.
It is preferable to use a negative toner developer for J1 (trade name: rNPN mark).

In the color image forming apparatus according to the present invention, which is constructed as shown in "I Mitate Section 1", the photoreceptor forming the image carrier comprises a photosensitive material layer and a color filter formed to be removable from the photosensitive material layer. With this structure, it is possible to create a complete color image with just one exposure and development.

If the ungenerated IJ is followed, it is possible to obtain a high-quality color image with better color reproducibility and no color shift.

[Brief explanation of the drawing]

FIGS. 1(A) to 1(J) are separate views for explaining an image forming method of an image forming apparatus related to unoccurred IJI. FIG. 2 is a plan view of one embodiment of the color filter layer of the photoreceptor. FIG. 3 is a cross-sectional view of one embodiment of a color filter layer of a photoreceptor. FIG. 4 is a schematic diagram of an embodiment of an image forming apparatus according to the present invention. 1: Conductive substrate 2: Photosensitive material layer 3: Color filter layer Agent Patent attorney Akio Tachibana 1']'' Agent Patent attorney Nagao Miyagawa j,; -11
,・ 1 Figure 1 (A) (B) (C) (D)
(E) (F) (G) (H)
(I) (J) Figure 2 Danmu

Claims (1)

[Scope of Claims] 1) A photoreceptor comprising a photosensitive material layer and a light-transmitting insulator that is removably provided to the photosensitive material layer and has color filters of multiple colors; A charging means for uniformly charging the light-transmitting insulator side, and an exposure for irradiating the uniformly charged photoreceptor with an original optical image from the light-transmitting insulator side to the photosensitive material layer side and removing static electricity at the same time.・
a static eliminating means; a full-surface exposure means for exposing the entire surface of the photoreceptor to form a latent image on the surface of the transparent insulator; and a developer for developing the latent image on the transparent insulator with non-transparent particles. 1. A color image forming apparatus comprising: means. 2) The photoreceptor is comprised of a conductive substrate, a photosensitive material layer, a transparent insulating film, and a plurality of color filter layers formed on the transparent insulating film, which are sequentially laminated. equipment. 3) The device according to claim 2, wherein the filter layer is formed by printing a plurality of colors in stripes, dots, or mosaics on a transparent insulating film.