JPS58156953A - Formation of image - Google Patents

Abstract

PURPOSE:To obtain not only copying of single color but also copying of multiple colors easily, by using a dielectric material and photoelectric converters thereby forming electrostatic latent images. CONSTITUTION:A photoelectric converters 1 is made into the construction wherein a transparent electrode 2 is provided on the top surface of a photoconductor layer 3, and many needle electrodes 4 are studded linearly on the bottom surface. The light reflected from an original to be copied is converted to electric charge by using the photoelectric converters formed in such a way. Electrostatic latent images corresponding to single color or plural colors are formed on a photoreceptor consisting of a dielectric layer, a photoconductor layer and a transparent insulation layer. Copied picture images are formed by developing such electrostatic latent images. Not only monochromatic copying of single color but also polychromatic copying are thus accomplished easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming method for forming an electrostatic latent image on a photoreceptor comprising a conductive layer, a photoconductive layer and a transparent insulating layer using a photoelectric conversion element.

The purpose of the present invention is to provide an image forming method that enables the formation of an electrostatic latent image, which was conventionally formed optically, using a charging conversion element that converts light into an electrical signal. Issha Co., Ltd., of course, aims to make it easy to obtain multicolor copies.

An example of this invention will be described in detail below with reference to the drawings.
Figure 1 shows a photoelectric conversion element 1 used in the method of the present invention, which has a structure in which a transparent conductive layer 2 is placed on the top surface of a photoconductor layer 3, and a number of needle-shaped electrodes 4 are planted in a straight line on the bottom surface. 0 Next, the method of forming an electrostatic latent image on the surface of the photoreceptor 5 using the photoelectric conversion element l and obtaining a two-color copy image from this electrostatic latent image will be described in detail. The photoreceptor 5 on which an electrostatic latent image is to be formed has a structure in which a photoconductive layer 5b is provided on the top surface of the photoconductive layer 5a, and a transparent insulating layer 5c is provided on the top surface of the photoconductive layer 5b, for example as shown in FIG. It is drum-shaped. In addition, an optical system (not shown) is introduced into the periphery of the photoreceptor 5, and there is a filter group consisting of a cyan filter 6m and a red filter 6b, into which reflected light from a copy original enters. A photoelectric conversion unit 7 including a photoelectric conversion element 1 located between a part of the filter 6h and the photoreceptor 5; a red developing roll 8 for developing an electrostatic latent image formed on the surface of the photoreceptor 5; Black developing rolls 9 and 1
A preliminary transfer corotron 10, a transfer corotron 11, a detack corotron 12, a static eliminating corotron 3, a cleaner 14, a negative charger 15, a positive II charger 16, etc. are connected to the photoreceptor 5.
They are sequentially arranged in the above order along the rotation direction.

As the photoreceptor 5 rotates in the direction of arrow A, the surface of the photoreceptor 5 is negatively charged by the negative charger 15 as shown in FIG. As shown in b>, WI'#L is performed correctly.

When the band m surface of the photoconductor 5 reaches the photoelectric conversion section 7, only white light out of the reflected light from the document guided to the photoelectric conversion section 7 by an optical system (not shown) passes through the cyan filter 6a and is transferred to the photoconductor. As a result, the charge on the white light irradiated portion of the surface of the photoreceptor 5 disappears as shown in FIG. 3(C). Next, the white and red reflected lights passing through the red filter 6b reach the photoelectric conversion element 1 whose transparent conductive layer 2 is negatively biased by the constant voltage DC power supply 17 as shown in FIG. When the white and red irradiated parts of 1 become conductive, a negative bias voltage is applied to the needle-like electric current 14 of this part, generating a negative rotating charge, and the surface potential of the white and red parts becomes negative. Charged to approximately a potential. Also, at this time, the negative charge lll#-i on the transparent insulating layer 5C in the red part
Since positive charges are held in the leading conductive layer 5b of the photoreceptor 5, the amount of negative charges is greater than the amount of negative charges in the transparent insulating layer 5C of the white portion.

Next, when the above process is completed and the reflected light that has passed through the red filter 6b reaches the surface of the photoreceptor 5, the charges other than the positive charges on the leading conductive layer 5b held by the negative charges on the transparent insulating layer 5C are removed. , as shown in FIG. 3(C), the electric potential is discharged between the conductor layers 5α, and the black area on the surface of the photoreceptor 50 is positive, the white area is zero, and the red area is negative, based on the white line potential. An electrostatic latent image with a potential is formed. This electrostatic latent image is first developed as shown in FIG. 3 by a negatively biased red 11HI roll 8, and then developed as shown in FIG. 3(V) by a positively biased black developing roll 9. As a result, a two-color toner image of red and black is developed on the surface of the photoreceptor 5. After this two-color toner image is transferred by the transfer corotron 11 onto a paper 18 fed from a paper feeder (not shown), the toner remaining on the surface of the photoreceptor 5 is removed by a cleaning device ft14.
Need it again? The toner on # and 18 is fixed on #8 by a fixing device (not shown) and then discharged to the outside of the copying machine (not shown) to complete the copying.

In the above example, 1B2 is used for black and red copies.
As mentioned above, it is of course possible to use a single color or other colors.

Alternatively, it is also possible to use a conductive brush as the needle-like electrode 4 of the photoelectric conversion element 1.

As detailed above, the method of this invention uses a photoconductive element to convert reflected light from an original to be copied into electric charge, and forms an electrostatic latent image corresponding to a single color or several colors on a photoreceptor. 1
Since a close-up image can be obtained by developing this electrostatic latent image, not only monochrome copies but also multicolor copies can be easily obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the method of this invention, FIG. 1 is an explanatory diagram of a photoelectric conversion element, FIG. 2 is a schematic configuration diagram of a photographic camera that implements the method of this invention, and FIGS. 3(a) to 0) is a process diagram of this invention method. I is a photoelectric conversion element, 2Fi transparent insulating layer, 3 is a leading conductive layer,
4 is a needle electrode, 5 photoreceptors, 5g1ri conductor layer, 5b
5c is a transparent insulating layer, and 6α and 6b are filters. Figure 1 Figure 2 Figure 3 (b1 flat bottom 6

Claims (1)

[Claims] The photoreceptor 5 is made up of a conductor layer 5a, a photoconductor layer 5h, and a transparent insulating layer 5C! A first step of uniformly charging one surface, and the surface of the photoreceptor 5 is charged with the #! A second step of charging to the opposite polarity to the first step, and a filter 6a that passes through the specific color to be reproduced.
The photoreceptor 5 is connected to l! Third step of emitting light and photoconductive layer 3
It consists of a transparent photoconductive layer 2 and a needle-like electrode 4.
A fourth step in which the photoelectric conversion element 1 biased with the same polarity as the process is irradiated with electric light through a filter 6b that transmits a specific color to be reproduced; The fifth step of lighting 5 and the upper arrangement 1
An image forming method comprising at least one developing step of developing the electrostatic latent image on the photoreceptor 5 formed in the fifth step.