JPS6165256A - Electrophotograhic sensitive body - Google Patents

Abstract

PURPOSE:To obtain the lightweight electrophotographic sensitive body which has high size accuracy and a uniform photosensitive layer surface by using a metallic cylindrical body formed by interposing an annealing stage and surface machining between deep drawing and ironing. CONSTITUTION:An aluminum cylinder 1 is put in the die 4 of a drawing equipment and a punch 5 is pressed into a die 7 through a die 6 to obtain a pipe stock 2. This pipe stock 2 is heat-treated to remove its residual stress, and the surface of the pipe stock 2 is machined so as to improve its finish size accuracy. Then, an ironing punch 9 is pressed toward an ironing die 8 to iron the pipe stock 2, thereby obtaining a cylindrical body 3. Then, a photosensitive layer 10 made of a photoconductive material, e.g. selenium-tellurium alloy is vapor-deposited on the base 3.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to an electrophotographic photoreceptor in which a photosensitive layer is formed on a thin cylindrical metal substrate.

[Prior art and its problems]

Electrophotographic photoreceptors play an important role in image formation in electrophotographic RC devices.The surface of the electrophotographic photoreceptor is uniformly charged by corona discharge in the dark area, and then image exposure is performed on the surface. , an electrostatic latent image is formed, and the electrostatic latent image is further formed by charged colored particles. ! The latent image becomes visible. The developed image is then transferred to plain paper to form an image. In order for the image formed here to be clear and uniform, the surface charge of the photoreceptor must be uniform over the entire surface of the photoreceptor, and the contact between the surface of the photoreceptor and the developing sleeve of the developing device must be uniform. It is necessary to keep the gap constant. To this end, it is required to improve the dimensional accuracy of the electrophotographic photoreceptor, particularly the cylindrical conductive substrate serving as its base, such as uneven thickness roundness and concentricity. The cylindrical base of a conventional electrophotographic photoreceptor is made from a hot extruded aluminum alloy tube with a wall thickness of 4 to 4 mm by cold drawing.
The target dimensional accuracy was obtained by forming the wafer to a predetermined size of 511++fli degrees, then processing the outer and inner peripheries, and then finishing the outer periphery. However, if the wall thickness of the raw pipe is as thick as 4~5+w+*, the required A
Since there are many scenes of one metal, the substrate becomes expensive and the weight of the photoreceptor becomes large. Therefore, if an attempt is made to reduce the wall thickness by cold drawing in order to reduce the price and weight, there is a problem in dimensional accuracy and it cannot be put to practical use. As a method for thinning a blank pipe, the I process is known, for example, as described in the Japan Institute of Metals' report "Metal Handbook" (Published in 1982, p. 0718). This processing method forms a bottomed cylindrical body by drawing and ironing, but wrinkles tend to form on the cylinder surface during deep drawing, and stress remains inside the cylinder, causing distortion and adversely affecting dimensional accuracy.

[Purpose of the invention]

The present invention can be used in an electrophotographic device to produce clear images. It is an object of the present invention to provide a lightweight photoreceptor for electrophotography having a thin substrate and having uniform dimensional accuracy and photoreceptor surface uniformity that can be uniformly adjusted (-rn degree of 1).

[Key points of the invention]

According to the present invention, an electrophotographic photoreceptor has predetermined dimensions and surface roughness created by drawing a cylindrical metal material, annealing it, cutting the surface, and then ironing it. The above object is achieved by forming a photosensitive layer on a cylindrical substrate having a cylindrical substrate.

[Embodiments of the invention]

Figure 1+al~tel shows the manufacturing process of the base used in one embodiment of the present invention 6 For example, 4.5 shown in Figure 1Il1
An aluminum circle i11 having a peak of 1 γ mm is placed in the die 4 of the drawing device shown in Fig. 4d1, and the punch 5 is pushed in the direction of the arrow into the die 7 through the die 6 to obtain an outer diameter determined by the shape of the die. Then, a raw tube 2 having an inner diameter determined by the shape of the tip of the punch 5 and a wall thickness of about 31 mm as shown in the figure is obtained. This raw tube 2 is heat treated at 400 degrees for 3 hours to remove residual stress. Next, the surface of the raw tube 2 is cut in order to improve the finished dimensional accuracy. The feed rate of the cutting tool is 0.1 +*s/
rev or less, and the surface roughness needs to be 3μ steel or less. Feeding speed 1 If the surface roughness exceeds these values, when a photosensitive layer is formed on the finished substrate, the surface will have large waviness, causing defects such as white spots on the image, and making it difficult to obtain uniform density. become unable to do so. Finally, using the ironing device shown in the figure (@), the raw pipe 2 is ironed by pushing out the punch 9 in the direction of the arrow toward the ironing die 8, and the meat shown in tel [ffl ff 0.5
A cylinder 3 of ~2 m+* is obtained. The completed cylindrical body 3 has, for example, a thickness unevenness of 0. Q2+1+I, outer diameter roundness 0.021
, it was possible to obtain a cylindrical substrate with high cylindrical accuracy and high surface accuracy with a surface roughness of O1. After finishing to the required surface roughness if necessary, a photosensitive material 11110 made of a selenium-tellurium alloy is deposited on the substrate 3 as shown in FIG. Manufacture the photoreceptor. [Effects of the Invention] The present invention uses a metal cylindrical body created by inserting an annealing process and a surface cutting process between the deep drawing process and the ironing process in the DI process as the base of an electrophotographic photoreceptor. It is. This removes surface wrinkles and internal stress caused by deep drawing, making it possible to obtain a substrate with high dimensional accuracy and a uniform surface without uneven thickness. It has become possible to produce photographic photoreceptors at a low cost, and the effect is extremely large.

[Brief explanation of drawings]

Fig. 1 shows the manufacturing process of a cylindrical substrate used in 1''P and Examples of the present invention, (♂1. lbl, tel is a cross-sectional view showing the shape of the material by the process, ldl is a drawing device, t
A cross-sectional view conceptually showing the el ladder processing device,
FIG. 2 is a sectional view of an electrophotographic photoreceptor according to an embodiment of the present invention - 1: cylindrical material, 2: blank tube, 3: cylindrical body, 4.7:! ig
,,5.9=Punch, 6.8; Dice, 10! Photosensitive waste. −“−1 ,・ji

Claims (1)

[Claims] 1) An electrophotographic photoreceptor comprising a photosensitive layer formed on a cylindrical base made by drawing a cylindrical metal material, annealing it, cutting the surface, and ironing it.