JPS6214662A - Color electrophotographing device - Google Patents

Abstract

PURPOSE:To obtain a color image having no color mixture by performing optical scanning and transfer once by providing plural image holding members and equalizing differences in time from the exposure of the respective image holding members to transfer to transfer paper to delay times of the transfer from the respective image holding members to the transfer paper. CONSTITUTION:The plural image holding members correspond to respective separated colors. An original is scanned optically and reflected light is separated by a color separation mirror or filter into respective color components, to which the respective image holding members are exposed. Latent images formed on the image forming members as mentioned above are developed with respective color toner particles and transferred to the transfer paper. Distances from the exposure of the respective image holding members to the transfer to the transfer paper are different and when the image holding members move at the same speed, there is a difference in time from the exposure to transfer. In this case, belts of the image holding members 10, 11, and 12 differ in length and differences from exposure positions to the transfer position are equal to differences among respective transfer rolls and color transfer images are obtained without color mixture so that images of the original are coincident in position.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color electrophotographic apparatus that can be used in a color copying machine or a color printer.

2. Description of the Related Art Conventionally, in copying machines and laser printers, various methods have been used to appeal to the human visual sense by using color instead of black and white monochrome. For example, you can obtain a single color image by replacing it with a color toner developing machine, or you can obtain a multicolor image by transferring the single color image onto the transfer paper using another color toner. I am also able to obtain superimposed color images. Furthermore, full-color images are also obtained by repeating transfer onto transfer paper multiple times using multiple color toner developing machines in a copying machine.

On the other hand, for laser printers as well, a method of obtaining a two-color printer image has been proposed in order to distinguish characters and dividing lines by color.

Problems to be Solved by the Invention Obtaining multicolor images using conventional methods requires a lot of effort and time, and requires a large machine.

According to the present invention, a color image without color mixture can be obtained by performing optical scanning and transfer twice. The objective is to provide a compact, high-speed color electrophotographic device.

Means for Solving the Problems A plurality of image holding members are provided, and each difference in time from exposure to each image holding member to transfer to transfer paper is calculated by calculating the difference in time from exposure of each image holding member to transfer paper. By making the delay time the same as the transfer delay time, the problems of the conventional technology are solved.

Function: The plurality of image holding members correspond to each separated color. The original is optically scanned, and the reflected light is color-separated by a color separation mirror or filter and exposed to each image holding member. The latent image formed on the image holding member in this way is developed with each color toner and transferred to transfer paper.

The distance from exposure of each image holding member to transfer to transfer paper is different, and if each image holding member moves at the same speed, there will be a difference in time from exposure to transfer. The transfer position of each image holding member onto the transfer paper is such that the transferred images of each color onto one sheet of transfer paper match in position. That is,
The difference in time from exposure of each image holding member to transfer to transfer paper is made to be the same as the delay time of transfer of each image holding member to transfer paper.

In this way, a color transferred image can be obtained on the transfer paper by - times of optical scanning and transfer.

Embodiment (Embodiment 1) FIG. 1 shows a color copying apparatus with a fixed document table, showing an embodiment of the present invention.

A document 1 is optically scanned by a lamp 2 and a first mirror 3 in the direction of the arrow. The reflected light from the original is transmitted to the first mirror 3, the second mirror 3, and the second mirror 3. It is reflected by the third mirror 4 and enters the lens 5. lens 5
The light that has passed through is reflected by the fourth and fifth mirrors 6.
The sixth mirror 7 is a dichroic mirror that reflects red (R) light and transmits blue (B) and green (G) light. The sixth mirror 8 is G
The sixth mirror 9 reflects the source of B and transmits the source of B.
reflects the light of

The H light reflected by the sixth mirror 7 is exposed to the belt-shaped image holding member 10 of PC. G reflected by the 6th mirror 8
The image holding member 11 is exposed to the light. The B light reflected by the sixth mirror is exposed to the image holding member 12.

The latent image on the image holding member 10 is developed with cyan (C) toner by a developing device 14, and transferred by a transfer roll 17 onto a transfer paper 13 moving in the direction of the arrow. The latent image on the image holding member 11 is developed with magenta (M) toner in a developing device 15.
The image is transferred by the transfer roll 18 onto the transfer paper 13 that has been moved from the transfer roll 17 . The latent image on the image holding member 12 is developed with yellow (Y) toner by a developing device 16, and transferred by a transfer roll 19 onto a transfer paper 13 that has been moved from a transfer roll 18.

The lengths of the belts of each image holding member 10, 11, 12 are different, and the difference from the exposure position to the transfer position is equal to the difference between the positions of the respective transfer rolls. The images of the original are aligned in position, and a colored transferred image can be obtained without color mixture.

(Embodiment 2) FIG. 2 is a color copying apparatus showing another embodiment of the present invention.

The original 21 is scanned by the lamp 22 and the first mirror 23 in the direction of the arrow. The reflected light from the original is sent to the first mirror 2.
3.Second. The light is reflected by the third mirror 24 and the fourth mirror 26 and enters the lens 26. The light transmitted through the lens 26 is
It is reflected by the fifth and sixth mirrors 27.

The seventh mirror 28 reflects the H light and transmits the B and G light. The seventh mirror 29 reflects the G light and transmits the B light, and the seventh mirror 3o reflects the B light.

The H light reflected by the seventh mirror 28 is exposed to a uniformly charged photoconductive member 31 mainly composed of amorphous silicon and having a diameter of 40 mm. The source of G reflected by the seventh mirror 29 is exposed to the photoconductive member 32, and the source of B reflected by the seventh mirror 3Q is exposed to the photoconductive member 33.

The latent image on the photoconductive member 31 is developed with cyan (C) toner by a developing device 34, transferred to a transfer member 37, and transferred by a transfer roll 41 to a transfer paper 4o moving in the direction of the arrow.

The latent image on the photoconductive member 32 is developed with magenta (M) toner in a developing device 35 and transferred to a transfer member 38, and transferred by a transfer roll 42 onto a transfer paper 40 that has been moved from a transfer roll 41.

The latent image on the photoconductive member 33 is developed with yellow (Y) toner from a developing device 36 and transferred to a transfer member 39, and then transferred by a transfer roll 43 onto a transfer paper 4o that has been moved from a transfer roll 42.

The belt lengths of each transfer member 37, 38, 39 are different, and the time from exposure of each photoconductive member 31, 32, 33 to transfer of each transfer member 37, 38, 39 to transfer paper 40 is Each difference is equal to the delay time of transfer of each transfer member 37, 38, 39 onto the transfer paper 40. As a result, the images of the original document are aligned with each other on the transfer paper, and a colored transferred image is obtained without color mixture.

The photoconductive members 31, 32, and 33 are made of a material containing amorphous silicon as a main component, and have good printing durability.
Even if the diameter is reduced to 40 sieves, it has a printing life of 150,000 to 300,000 sheets, so it can be used as a high-speed color copying device for practical purposes without shortening the time required for maintenance. .

Effects of the Invention The present invention has a plurality of image holding members, and each difference in time from exposure to each image holding member to transfer to transfer paper is
By making the delay time of the transfer of each image holding member to the transfer paper the same, a color image without color mixture can be obtained by -times of optical scanning and transfer, resulting in a high-speed color electrophotographic device. .

[Brief explanation of drawings]

FIGS. 1 and 2 are schematic configuration diagrams showing one embodiment of the present invention. 1.21...Original, 2.22...Lamp, 3.23...First mirror, 4,24...Mark, second and third mirrors 6.26・・・・・・Len, 2', 1
0, 11, 12... Image holding member, 31, 32.
33...Photoconductive member, 3738.39...
・・Transfer member, 14, 15, 16, 34.35.36・
...Developer, 17, 18, 19, 41.42.4
3...Transfer low/l/, 13.40...
・Transfer paper. Name of agent: Patent attorney Toshio Nakao (1 person)
,・Manuscript 71ri11. Introduction 6 Mirror?・・・
・ ７ ん ”)” Danger//, /l' 0. A
K-Theft Long Materials 5... L-n: 2. ” t7
．． Acknowledgment/de...Shosha roll 2...4th calculation 5 mirror

Claims (4)

[Claims] (1) A plurality of image holding members having different times from exposure to transfer are provided, and the difference in time from exposure to each image holding member to transfer to transfer paper is calculated based on each of the image holding members. A color electrophotographic apparatus characterized in that the delay time of the transfer to the transfer paper is the same as that of the transfer paper. (2) A color electrophotographic apparatus according to claim 1, wherein the image holding member is belt-shaped. (3) A color electrophotographic apparatus according to claim 1 or 2, wherein the image holding member comprises a photoconductive member and a transfer member. (4) A color electrophotographic apparatus according to claim 1, wherein the photoconductive member is formed of a material whose main component is amorphous silicon.