JPS5849955A - Electrophotographic receptor - Google Patents

Abstract

PURPOSE:To enable 2-color copying by exposure to different color light in a simple process by providing 2 photoconductive layers made selectively different in sensitivity to exposed color and in transfer ability in accordance with the polarity of light carriers from each other. CONSTITUTION:A first photoconductive layer having high selective sensitivity to color light A, and ability to transfer both light carriers of electrons and positive holes produced in exposure is formed by laminating a vapor deposited Se layer 2, an Se-Te alloy layer 3 contg. 10-30wt% Te are laminated in due order on a conductive substrate 1. On this layer 3, a second photoconductive layer 4 of Se having high sensitivity to color light B as compared with the color light A and ability to transfer only positive holes is formed by controlling impurities in Se and temp. of a base during vapor deposition. This photoreceptor surface is subjected to simultaneous exposure to color light A and positive charging, then, negative charging for reducing positive surface charge, and finally, imagewise exposure to color light B, resulting in charging the part exposed to A and B to 0 surface potential, the part exposed to only A to +, the nonexposed part to -. A 2-color image is obtained by developing the photoreceptor with 2 toners different in polarity and color in succession.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic photoreceptor, and an electrophotographic photoreceptor capable of recording multiple colors in a simple recording process. An exposure section and a developer S corresponding to the 0th color are installed in the peripheral area of the rotating drum provided on the surface of the photoreceptor tube on which the layer 0 photosensitive layer is provided. , during the next 01@ rotation, exposure and development for the second color is performed.

In addition, when combining two types of 1jI0 information to obtain re-IIL information, the exposure for the 10th information is performed during one revolution of the rotating drum, and the exposure tube for the second information is performed during the next revolution. 1 development 1 fixing process to obtain p regeneration Ii high O However, H0 space regeneration! As the number of display colors increases, it is necessary to increase the number of rotations of the drum and the recording speed decreases.The present invention was developed in view of these points (multi-color recording overlay). It is an object of the present invention to provide an electrophotographic photoreceptor that enables high-speed recording. Preferred embodiments of the present invention will be described below in detail with reference to the drawings. The figure is a configuration diagram of one embodiment of the present invention, and 3 is a carrier generation layer forming the first photoconductive layer, which is a selenium tellurium (SeTe) alloy layer, and the T@ concentration is 10 to 10. 3Qwt%O is effective. The thickness of the medium 7 generation layer 3 is 0.3 to 5 μm, preferably 0.5 to 3 μm, and the thickness of the carrier transport layer 2 is 10 μm.
~ iooμm is jll ・82 photoconductive layer 4 is S
The upper limit of the layer thickness O is the thickness that allows light of the color of silver 1 to pass through and contributes to the generation of sufficient carriers in the carrier generation layer sk, and the lower limit is the thickness that can contribute to the generation of sufficient carriers in the carrier generation layer sk. The appropriate thickness is 61, specifically 10 to 30βm, which can hold the potential that can be applied to Yoshinki Kama Proryusu.Next, the materials used for this photoreceptor will be explained.Carrier Transport layer 2 is light l? It is necessary to have the ability to efficiently transport both electrons and holes, which requires that the osvm degree of electrons and holes is large and that they are almost equal. An example of the material layer is shown in FIGS. 2(a) and 2(b).

The figure shows bright attenuation at the surface of the photoreceptor, and the horizontal axis ('')e (b)K shows positive and negative charges (
Charge voltage: 5KV, irradiation light wavelength: 480nm* 0. a
μw/cm”) ・This shows that the transfer capacity of electrons and holes in the Se layer is almost the same. ・There is also a sufficient charge force under positive and negative corona charging. This is because it prevents charge injection from the conductive substrate.The SeTe alloy material used as the carrier generation layer is a material commonly used as a material for electrophotography. The 20th photoconductive layer 4 allows light of the 10th color to pass through.
A material is required that is sensitive to light of the first color and that transports almost no electrons among photocarriers, does not transport holes, and easily transports holes. This rounding requires that the electron mobility a be small and the hole O mobility a be large, and the properties of the selenium material layer that satisfy these properties are shown in Figure 3 (1). .

As shown in (b), as is clear from the figure, under positive corona charging, it has excellent sensitivity, and under negative corona charging, it shows only slight sensitivity, and the Se material easily transports holes. This confirms that it transports almost no electrons. Se materials with such characteristics can be made by controlling impurities or controlling oi*mFIL during deposition. Typical spectral sensitivity of the electrophotographic photoreceptor according to the present invention
In Figure 411, which shows the j% property, the characteristic corresponding to the O wavelength region on the left shows the case where the 12th photoconductive layer 4 is irradiated with light of the 20th color, and corresponds to the wavelength region on the right. The characteristics to do are #! l
The case where light of the color of O photoconductive layer 2Kjlll is irradiated is shown. Next, we will explain the above-mentioned electronic Yoshinki @0 Koyo using the photoconductor.0 First, the photoconductor is irradiated with the light tId of the 10th color (A color), and at the same time 1(lExvaf charging is applied.(I! 5 God)・
) The positive charge is held on the surface and the photoconductive layer 4 transports almost no electrons, the negative charge is held on the SeTe layer in proportion to the positive charge on the surface, and then the negative corona. After performing electrification 1 in the air (5th It(b)),
Rattan 5m (C) IIC indication? ! Perform K11ft'. At this time, there is no difference between the photoreceptor surface O unexposed area (dark area) - 0 charge distribution O, but both the 10th color O light and the m2c 1 color (B color) light (LA The charge distribution on the surface of the photoreceptor exposed to light by 10LB) shows that both the 1kl and 20th photoconducting layers become conductive and the lumi charges disappear.On the other hand, the part exposed to the 16th color O light In this case, the first photoconductive field becomes conductive, but some charges remain. 6111 shows the potential distribution on the surface of the photoreceptor obtained by such a process, and is exposed by 11110 colors 0ft0. and changes in the surface potential of the photoreceptor and the surface potential of the dark area due to exposure to both the 1st o color O light and the 120th color light. C) &C Indicates the work 1i1 period.
In this way, an electrostatic S image is formed on the surface of the photoreceptor, and the image is then processed through the normal development process (11 layer process). '! In this way, for example, it is possible to copy a two-color original without using a color 74 router and in one press (in the case of PTJ+rotating photosensitive drum O, the rotating drum is rotating). becomes.

The photoreceptor according to the present invention has a ^-sensitivity PL even in the long wavelength region of the semiconductor laser light. , and when the first O second information is convolved with the 10th fiO light, the 20th color light, and 0* can.

As is clear from the above description, the photoreceptor according to the present invention has two photoconductive layers with different sensitivities to selective KjI light color, and has different transport abilities in each photoconductive layer depending on the polarity of photocarriers. It is different because it is closed.
Exposure with color O light has the advantage of being able to perform electrophotography with one light, which is simpler than K.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of an embodiment of the photoreceptor according to the present invention, #12
Figures (a) and (b) are bright decay characteristic diagrams of the surface potential of the first photoconductive layer (Be material layer) under positive and negative charge. Figure J14 is a bright decay characteristic diagram of the surface potential under positive and negative corona charging of the photoconductive layer (Be material layer) of No. 2, and Figure J14 is a diagram of the spectral sensitive layer characteristics of the photoreceptor according to the present invention, Figure 511(a) to ( C) is an electrophotographic alignment process diagram using the photoreceptor according to the present invention, and FIG. 6 is a diagram showing the O photoreceptor surface potential during the process shown in FIG. 5.Ol: conductive potential substrate %2
: carrier transport layer of kite 10 photoconductive layer, 3: carrier generation layer, 4: photoconductive layer of ji2,

Claims (2)

[Claims] (1) An electrophotographic photoreceptor having a 9 m1 photoconductive layer formed on a conductive group and a 20 Oshima photoconductive layer formed on the 10th photoconductive layer, the photoconductive layer having #gi has a surface charge retention function, has high photosensitivity selectively to MIO color light, and has the ability to transport both electrons and holes of photocarriers generated during exposure. The second photoconductive layer has a relatively high photosensitivity with respect to the 10th color light, and only one hole among the target photocarriers has an O transport ability. An electrophotographic photoreceptor comprising: (2) The photoconductive layer described in □ above is made of tellurium (Te) at #I degree.
) is doped with selenium tellurium (SeTe)l, which serves as a photocarrier generation layer, and a seleno(8@) layer which has the ability to transport both photocarriers, electrons and holes.
The electrophotographic photoreceptor O according to claim 1, wherein the 20th photoconductive layer is a selenium layer.