JPS60263176A - Electrophotographic device capable of selecting of print color - Google Patents

Abstract

PURPOSE:To use only one photosensitive body and to obtain a sharp polychromatic electrophotograhy having neither color shifting nor color mixture by providing electrostatic chargers and exposed part developing devices corresponding to the 1st, the 2nd, and the 3rd colors respectively. CONSTITUTION:The photosensitive body 1 is cleaned up by a photosensitive body cleaner 15 and a preliminary exposure part 2 mechanically and electrically and charged electrostatically by the 1st charger 3. For example, when the 1st and the 2nd colors are selected, the electrostatic charging of the 2nd charger 4 and the image exposure of the 1st color by the 1st exposure part 5 are performed simultaneously. Then, the 2nd exposure part 6 performs image exposure of the 2nd color and the 1st developing device 7 develops the latent image of the 2nd color. An entire-surface exposure part 11 performs entire-surface exposure and the 3rd developing device 12 develops the latent image of the 1st color. Particles of toner of the respective colors are uniformed in polarity by a polarity converter 13 and charged by a transfer charger 14 to transfer the toner. When the 3rd color is selected, the 3rd charger 8, the 3rd exposure part 9, and the 2nd developing device 10 is used.

Description

Detailed Description of the Invention (a) Technical Field The present invention relates to an electrophotographic apparatus, and particularly to an electrophotographic apparatus that exposes and develops a plurality of images on a drum or belt-like photoreceptor and transfers them to a transfer material such as paper. It is particularly used in multicolor electrophotographic devices that allow the user to select the colors to be printed.

(0) Prior Art Conventional electrophotographic equipment has the following characteristics for one image exposure:
A single light source and photoreceptor were used. Therefore, when multicolor electrophotography is required, it is necessary to prepare as many light sources and photoreceptors as there are colors and apply the colors one after another, or to expose and develop the photoreceptors and transfer them to the transfer material. By repeating the process a necessary number of times, the colors are applied over and over to obtain a desired multicolor electrophotograph. However, the former has the disadvantage that the vR device becomes a doll and requires a lot of maintenance due to the large number of parts.
'r, lI! ! The drawback is that it takes a long time to flash).

(The electronic angle of view of multicolor with few light sources and photoconductor is 1)
! There is a growing demand for a multi-color electrophotography device that allows easy selection of colors, which is relatively easy to do with conventional devices.

Applicants shall be able to comply with such requests.
First, patent application No. 59-OO5323 was filed. This consists of an electrophotographic department and a scanning optical system.
A first charger is placed in the IQ position facing the photoreceptor, a second charger is charged to opposite polarities, a first exposure section, a second exposure section, and a first developer. , a second developer is sequentially installed on the entire surface, and in the scanning optical system, one ray IJ' beam emitted from the C laser transmitter is alternately outputted by a modulator as printing signals of two different images. This laser beam is divided by a deflector into light having a large number of image signals of two images, and then these lights are scanned by a scanning device to scan the first and second images on the photoreceptor. It is designed so that the second exposure area is exposed to light.

However, if you try to use this device for exposure and development (with three or more colors), two photoreceptors are required.
The device has the drawback that it is difficult to control the rotational speed of the photosensitive plate in a synchronous manner.

(C) Invention 1-1 The present invention uses one photoreceptor when exposing and developing three or more colors, does not require synchronized control of the photoreceptors, and allows the printing color to be selected. “The purpose is to provide an electronic transmission device.

2) Structure of the Embodiment The present invention will now be described in detail with reference to the drawings based on the embodiment. In FIG. 1, reference numeral 1 denotes a photoreceptor, which has a structure having nine layers of three TJA layers.

Reference numeral 2 denotes a pre-exposure section, which provides uniform light to the photoreceptor 1F to eliminate unevenness in potential. 3 is a first charger that avoids charging the photoreceptor 1 with one polarity;
A direct current type is generally used. Reference numeral 4 denotes a second charge sr for charging the photoreceptor 1 with the other polarity, and in the embodiment, a type in which DC is folded into alternating current is used. 5 is a first exposure section that has an optical axis passing through the second charger 4 and is capable of exposing an image signal of the first color;
6 is a second light source capable of exposing an image signal of a second color;
This is the exposure area. 7 is a first developer capable of developing the image signal of the second color; 8 is a third charger capable of charging the photoreceptor 1 again to the polarity of another force; 9 is a third charger capable of developing the image signal of the second color; A third exposure section capable of developing a color image signal; It is desirable to use a so-called di-IT development device which performs development. Reference numeral 11 denotes a front haze tip that can expose the photoconductor 1, and 12 denotes a third developing device that can develop the image signal of the first color without contacting the photoconductor 1. It is preferable to use a so-called digital converter developing device, which performs development. , % J>, 13 is a polarity converter for aligning the polarity of each color toner for development so as to facilitate toner (=J adhesion) during transfer, and 14 is a polarity converter for electrifying the transfer material. 151.1 A transfer charger that attracts dirt, and a photoreceptor cleaner for wiping the surface of the photoreceptor 10 after the transfer is completed.

(e) Effects of the embodiments Next, its effect will be explained.

When the photoreceptor 1 is rotated by a driving mechanism (not shown),
The surface of the photoreceptor 1 is mechanically cleaned by the photoreceptor cleaner 15, and then exposed by the pre-exposure section 2, thereby erasing the remaining charged parts and electrically cleaning it. Wiped. Next, the photoreceptor 1 (which is charged to one polarity by the first charger 3, for example, in the case of a photoreceptor with a photoreceptor layer of N, the surface of the photoreceptor layer is charged to a positive voltage) It becomes as shown in curve a of Figures 2 to 4. Here i
In Table 1, the process for L is always (j) for any color combination.The following processes differ depending on the combination of snakes selected, so they will be explained separately.

(i) Select the first color and the second color: In FIG. 2, following the first charging (curve a), the second charging device 4
electrification (curve b) and image exposure of the first color (curve C) to the first exposure section 5 are performed at the same time v1. Subsequently, second color image exposure (curve d) by the second exposure unit 6
is carried out, and the second color image latent image is developed (curve ``)'' by the first developing device 7. Here, -〇, total i′rIl
After the entire surface is exposed (curve j) by the exposure unit 11,
The image latent image of the first color is developed by the third developer 12 (
Curve h) is done. Toner of each color for visual images (J and J to the polarity converter 13 (after the polarity is aligned, transfer charger 14
A non-transfer (not shown) transfer of two colors (1-no) is performed while being charged by A.

(ii) When the first color and the third color are selected: In FIG. 3, after the first charging (curve a), the charging by the second charger 4 (curve b) and the first The image exposure (curve C) of the first color is simultaneously performed by the third exposure section 6, and the image exposure of the third color (curve e) is performed by the second developing device 10. The image latent image is developed as curve 9). Here, -D, the entire surface is exposed (curve j) by the entire surface exposure section 11, and from -C,
The image latent image of the first color is developed by the third developer 12 (
Curve h) is done. Align the polarity of each color from 1 to no] Two-culm carving 111) LJ (+) and fil.

(iii) When the second color and the third color are selected;
In the figure, following the first charging (curve a), charging by the second charger 4 (curve b) is carried out (j).Next, the first developing device 7 exposes a second color image. (curve d) is performed, and the second color image latent image is developed by the first developer (curve f).

Here, the third charger once again applies a charge (curve i) to the other pole v1, and then the third color image exposure (curve e) is performed, and the second developer Oki's latent image is developed (song FJΩ).

The 1-culm that faces the polarity of each color from 1 to no is the same as (i>).

In accordance with FIGS. 2 to 4, in the embodiment, as a light source for exposure, after being modulated and polarized by a scanning optical system (not shown),
A laser beam divided into three color signals υ1 is used. In other words, the first laser beam 5△ is introduced into the first exposure section 5, the second laser beam 6△ is introduced into the second exposure section 6, and the third laser beam 9△ is introduced into the third exposure section 9. It is now possible to do so.

In this way, combination U printing of any two colors from the first color to the third color becomes possible. Table 1 summarizes the usage status of devices based on this color combination.

No. 18 Here, ○: Used equipment, ×: Unused equipment 2! : indicates C
1: First color image signal C2: Second color image signal C3: Third color image signal 11: First exposure section I2: Second exposure section 13: Third exposure section Dl: First exposure section (II device) 1) 2: 2nd yA imager 1) 3: 3rd developing device GO3: S3 band 1''1: Full-surface exposure section.

(f) Constitution of the Invention-1 As stated in J. above, the electrophotographic apparatus of the present invention capable of selecting printing colors has a light guide 1 on the surface of a conductive support.
It consists of a photoreceptor with a photoreceptor layer on which layers and insulating layers are sequentially laminated, and an exposure and development device installed on the stomach at a position opposite to this photoreceptor. An exposure section, a first charger that charges the photoreceptor to one polarity, a second charger that charges the photoreceptor to the other polarity, and an optical axis passing through the side wall of the second charger. a first exposure section capable of exposing an image signal of a first color; a second exposure section capable of exposing an image signal of a second color; and a first developing device capable of developing an image signal of 12 colors. a third charger capable of charging the photoreceptor again to the other pole; and a second developing device capable of developing a third color image signal, such as a third B light section capable of exposing a third color image signal. a full-surface exposure section that can expose the entire surface of the photoreceptor; and a third developer that can develop the image signal of the first color.
A polarity converter is installed in order to align the polarity of each color tonneau.

(Go to 1) Effects of the Invention As explained in the above-mentioned details, the A3 of the present invention requires only one photoreceptor, so it can produce clear multicolor electronic images without color shift or color mixing. In addition to being able to print 19 colors, it is now possible to print two colors out of the three colors arbitrarily and with less color misalignment.

[Brief explanation of drawings]

FIG. 1(,1) is an explanatory diagram of the outline of the electrophotographic apparatus of the present invention, and FIG. Figure 4 is a dimensional graph showing the exposure process when using the combination of the second color 33J and the third color 1). Photoreceptor, 2... Pre-exposure section, 3... First charger, 4... Second charger, 5)... First exposure section, 6
. . . second exposure section, 7 . . . first developing device, 8 . . 1'
13 Charger, 9...Third exposure section 10...Second developer, 11...Full surface exposure section 12...Third developer, 13.
...Polarity converter special applicant: Nikki Steel Works Co., Ltd. Representative name: Tateno Man7!1 No. igA

Claims (1)

[Claims] It consists of a photoreceptor having a photosensitive layer formed by sequentially laminating a photoconductor NR and an insulating layer on the surface of a conductive support, and an exposure and development device installed at a position facing the photoreceptor. an exposure section, a first charger that charges the photoreceptor to one polarity, a second charger that charges the photoreceptor to the other polarity, and a second charger that has an optical axis passing through a side wall of the second charger. 1
A first B light section capable of exposing a color image (number G), a second exposure section capable of exposing a second color image No. 18, a first developing device capable of developing a second color image signal, and a photosensitive a third charger capable of recharging the body to the polarity of another force; a third exposure section capable of exposing a third color image signal; a second developing device capable of developing a third color image signal; A full-surface exposure section that can expose the entire surface of the body, a third developing device that can develop the first color image No. 11, and a polarity converter that aligns the polarity of each color to be used for development are installed in sequence. What is claimed is: 1. An electrophotographic device capable of selecting printing colors, characterized in that: