JPS60263968A - Four-color electrophotographic device - Google Patents

Abstract

PURPOSE:To obtain a clear image requiring a short processing time by providing the 1st exposure and development part of the 1st color and the 2nd color, the 2nd exposure and development part of the 3rd color and the 4th color, and a polarity converter opposite a beltlike photosensitive body formed by laminating successively a photoconductive layer and an insulating layer on a conductive supporting body. CONSTITUTION:The surface of the beltlike photosensitive body 1 formed by laminating successively the photoconductive layer and insulating layer on the conductive supporting body is cleaned up mechanically, exposed to a pre-lamp 2, and charged electrostatically and positively by a charger 3, and the surface is then exposed to an image signal of the 1st color by an exposure part 5 while charged negatively by a charger 4 and then exposed to an image signal of the 2nd color by an exposure part 6. Then, the image is developed by a developing device 7, entire-surface exposure part 8, and developing device 9 and the operation of the 1st exposure and development part A is completed. Similarly, the 2nd exposure and development part B operates to expose and develop images of the 3rd color and the 4th color, and the images are transferred and fixed through the polarity converter.

Description

Detailed Description of the Invention (a) Field of Industrial Application This invention relates to an electrophotographic device, particularly an electrophotographic device 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. This is related to photographic equipment, and is used, for example, in multicolor electrophotographic equipment.

(b) Prior art Recently, there has been a desire to put multicolor electrophotography into practical use.
Various multicolor electrophotographic devices have been filed. However, most of these conventional devices use one light source and photoreceptor for one image exposure, and in order to provide multicolor electrophotography, it is necessary to use as many light sources as there are colors. Prepare a photoreceptor and apply colors one after another, or repeat the process of exposing and developing the photoreceptor and transferring it to the transfer material as many times as necessary. I was trying to get pictures.

(c) Problems that the invention seeks to solveHowever,
The former has the drawback that it requires 5,000 hours of maintenance due to the large size of the device and the large number of parts, while the latter has the disadvantage that it is difficult to overlay images accurately and takes a long processing time. There were drawbacks.

SUMMARY OF THE INVENTION An object of the present invention is to provide a single-color electrophotographic apparatus that can obtain clear multicolor electrophotographs with a single photoreceptor in a short processing time.

(d) Lower stage to solve the problem In order to solve this drawback, a photoconductive layer and an insulating layer are successively laminated on the 11W conductive support of the present invention! A three-layered photoconductor shaped like a bell, a first charger installed at the head facing the photoconductor to charge the photoconductor to one polarity, and a second charger to charge the photoconductor to the opposite polarity. a charger, a first exposure section having an optical axis passing through a side wall of the second charger and exposing an image signal of a first color; and a second exposure section exposing an image signal of a second color. , a first developing device for developing the image signal of the second color, a full exposure section for exposing the entire surface of the photoreceptor, and a first developing device for developing the image signal of the second color;
a first developer comprising a second developer for developing the color image signal;
an exposure and development section, a second exposure and development section that has the same components as the first exposure and development section and exposes and develops the third color and the fourth color;
The apparatus is equipped with a polarity converter for aligning the polarity of the developing material of each color absorbed on the photoreceptor, that is, the dove.

(Small) Effect Exposure and development by the first exposure and development section: The photosensitive layer of the belt-shaped three-layer photoreceptor is charged to one polarity by the first charger and electrically wiped, and then is charged by the second charger. The first exposure section exposes the first color image signal while being charged to the opposite polarity, and then the second color image signal is exposed to the second color image signal by the second exposure section. The image signal of the second color on the photoreceptor is developed by a first developer, and then, after the photoreceptor receives an overall exposure, the easy signal of the first color is developed by a second developer.

Exposure and development by the second exposure and development section: The photosensitive layer of the belt-shaped three-layer photoconductor is exposed to light and developed by the second exposure and development section.
The image signals of the fourth color and the fourth color are sequentially exposed, and the fourth color and the third color are developed in that order.

Polarity conversion and transfer: After the four colors are developed, the 1-toners of each color adsorbed on the photoreceptor are changed to 11yl by J to a polarizer. -r mark IJi” on the photoreceptor:
(+1) The transferred image is transferred to a transfer material such as paper, and the transferred image is fixed r1 by a fixing mechanism (not shown).

1 (f) Embodiments Hereinafter, embodiments of the present invention will be explained in detail based on the drawings. FIG. 1 shows an example of the /1 color electrophotographic device of the present invention, in which 1 is a belt-shaped three-layer photoreceptor in which a photoconductive layer and an insulating layer are sequentially laminated on a conductive f1 stack; 1 pre-lamp, 3 (: 1 first charger, 4 is a second charger 5 which exposes the image signal of the first color with the opposite polarity 1/l Lm band 'i'ji);>r, part, 6(,i 2nd
A second exposure section 7 exposes a color image signal, and a first developing device 7 develops a second color image signal. Reference numeral 8 represents a first full-surface exposure section that exposes the entire surface of the photoreceptor 1, and reference numeral 9 represents a second developing device that develops the image signal of the first color. From the first pre-lamp 2 to the second developing device 9, a first exposure and development section Δ of 4M is formed. The second exposure and development section B is
The second prelump 10, the third charger 11, the third color exposure section 12, the fourth charger 13, and the fourth
An exposure section 14, a third developing device 15 for developing a fourth color, a second full-surface exposure section 16 for exposing the entire surface of the photoreceptor 1, and a fourth developing device 17 for developing a third color are arranged. Reference numeral 18 denotes a polarity converter for aligning the polarities of the toners of each color absorbed by the photoreceptor 1.

The surface of the photosensitive layer 1 is mechanically cleaned by a mechanical cleaning device (not shown), and then a pre-lamp 2, which is a pre-exposure section, is used.
It is electrically wiped by being exposed to light. The surface of the photoreceptor 1 is positively charged by a first charger, negatively charged by a second charger 4, exposed to a first color image signal by a first exposure section 5, and then exposed to a first color image signal by a second exposure section. 6, the second color image signal is exposed. Next, after the second color image signal is developed by the first developing device 7, the image signals J,
The entire surface of the photoreceptor 1 is exposed to light. Next, the second developing device 9
The development of the first color image signal is performed by ti. After this series of operations by the first exposure and development section A is completed, a similar series of operations is performed by the second exposure image section B.
, After this, each color dob-L adsorbed on the photoreceptor
L 44 Bamboo converter [Thus, after the polarity is aligned, the transfer is performed, and further steps such as fixing (not shown) are performed 3.
It should be noted that normally a contact type brush type developer is used as the first developer 7, a non-contact type jump type developer is used as the second developer 9, and the third developer 15 is a non-contact type jump type developer. As the fourth developing device 17, a jump type developing device is generally used.

(f) Effects of the Invention As described above, the four-color electrophotographic device of the present invention has the following effects:
Multicolor electronic photographs are exposed and developed on one photoreceptor at once,
Since the image can be transferred to the transfer material, it becomes possible to downsize the device, and it also becomes possible to obtain clear multicolor electrophotographs without color shift, and also to shorten the processing time. Ta.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a four-color electronic photography neck according to the present invention. 1... Photoreceptor, 2... First pre-lamp, 3...
First charger, 4... First exposure section, 5... Second charger, 6... Second exposure section, 7... First developer, 8...
Full surface exposure section, 9... second developing device, 16... polarity converter, A-ζ/first image exposure section, B... second development exposure section. 1st day off

Claims (1)

[Claims] A conductive support has a photoconductive layer, an insulating layer (, - a belt-shaped three-layer photoreceptor laminated in sequence, and a photoreceptor layer is provided at a position facing the photoreceptor) = one (se 111).
A first charger that charges the photoreceptor, and a rod 1' that warps the photoreceptor.
a second charger for charging the second color to 1, and a first exposure section for exposing the -r image signal of the first color, which has an optical axis passing through the side wall of the second charger; A second exposure section that exposes the second color image, a first developer that develops the second color image, and a second exposure section that exposes the entire surface of the photoreceptor to develop the first color image. A first exposure and development section consisting of a second developing device, and a third exposure and development section having the same components as the first exposure and development section.
1! , ; It is characterized by having a second exposure and development section for exposing and developing 1st color, 1st color, and 1st color, and a polarity converter for aligning the polarity of the developing material of each color adsorbed on the photosensitive weight. 4-color electrophotographic device