JPS6328201Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mask for selective vapor deposition that covers grooves at the end of a cylindrical photoreceptor where deposition of a vapor-deposited film should be avoided when forming an electrophotographic photosensitive layer by vapor deposition.

Electrophotographic photoreceptors are usually manufactured by fitting a cylindrical conductive substrate onto a rotating support shaft, maintaining it at a predetermined temperature, and depositing a photoconductive layer on top of it by vapor-depositing a photoconductive material such as selenium material. Ru. However, if the vapor deposited material adheres to the end of the photoreceptor, which comes into contact with other mechanical parts when installed in a copying machine, etc., the vapor deposited material may peel off due to contact during operation and adhere to the surface of the photosensitive layer, causing image defects. To avoid this, cover such areas with a mask before vapor deposition. FIG. 1 shows this state, in which a mask 2 having an L-shaped cross section and an inner diameter equal to the outer diameter of the photoreceptor base 1 is fitted into the end of the photoreceptor base 1 until its end 21 contacts the end surface of the base 1. However, problems arise with such a mask when it is used on a substrate 1 having an annular groove 3 as shown in FIG. Such a groove 3 is provided, for example, as a part where a claw for paper separation is inserted, and if the vapor deposition substance adheres to the inner surface of this groove, it will be peeled off by the claw and become waste, so there is no space between the groove 3 and the mask 2. The space must be kept free of photoconductive material vapor. However, especially when it is desired to provide a photosensitive layer on the substrate 1 up to the edge of the groove 3,
It is difficult to prevent vapor from entering through the gap between the mask and the substrate 1. Further, if the groove 3 is long, it is difficult to attach and detach the mask, and there is a high risk that the end face of the base body 3 will be damaged by the mask. That is, when maskability is important, it is desirable to use a mask whose base material is the same material, but in this case, it is extremely difficult to attach and detach the mask, and the base is easily damaged, making it impractical. On the other hand, in order to improve the ease of putting on and taking off the mask and reduce damage to the base, the material of the base 1,
For example, it is conceivable to use a mask made of a material with a larger coefficient of thermal expansion than aluminum, but in this case, the maskability is significantly reduced, and it is difficult to find a suitable material with such a large coefficient of thermal expansion.

The present invention eliminates the above-mentioned drawbacks and provides a mask for selective deposition of photoreceptors for electrophotography, which has perfect mask properties including the groove at the end of the substrate, is easy to attach and remove, and causes no damage to the substrate. The purpose is to provide.

This object is a cylinder in which the mask is divided into two by a plane passing through the central axis, and the cylinder has a first protrusion on the inner side of one end whose inner diameter is equal to the outer diameter of the support shaft;
On the inner surface of the other end, there is a second protrusion whose inner diameter is larger than the outer diameter of the bottom surface of the groove of the substrate to be deposited and smaller than the outer diameter of the substrate, and the inner diameter of the intermediate portion is smaller than the outer diameter of the part of the substrate without the groove. The end surface of the cylinder on the side of the second protrusion has an inclined surface inclined toward the inner diameter side, and one side of the mutually opposing surfaces of the first protrusion of each semi-cylindrical body is equipped with a magnet, and the other side is ferromagnetic. When the opposing surfaces of the first protrusion are brought into close contact with each other and the inner surface of the first protrusion is brought into close contact with the outer surface of the support shaft, the inner surface of the second protrusion is located within the groove of the base and forms an inclined surface. can be made to abut against the outer edge of the side surface of the groove on the side farther from the end surface of the base body,
In that case, there is a gap between the side surface of the first protrusion on the second protrusion side and the end surface of the base, and between the side surface of the second protrusion on the first protrusion side and the side surface of the groove on the base body on the base end side. This is achieved by leaving a gap between each.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 3, a photoreceptor substrate 1 made of aluminum having a groove 3 has an inner diameter D ₁ and is fitted onto a support shaft 4 having an outer diameter D ₁ indicated by a dotted line for vapor deposition. The diameter of the bottom of groove 3 is D ₂ and the length in the axial direction is
Let it be L ₁ . The vapor deposition mask 2 is made of, for example, aluminum, which is the same material as the base, and consists of two semi-cylindrical bodies 22 divided by a plane passing through the central axis 5. At one end (the left end in the figure) of the semi-cylindrical body 22, there is a protrusion 23 toward the inner surface, the inner diameter of which is equal to the outer diameter _D1 of the support shaft.
is provided. The opposite end (the right end in the figure) has a protrusion 24 toward the inner surface, the inner diameter D ₃ of which is larger than the bottom diameter D ₂ of the groove 3 . End surface 2 of this protrusion 24
5 is formed as an inclined surface inclined toward the inner diameter side. Inner diameter D ₄ of semi-cylindrical body 22 between both protrusions 23 and 24
is larger than the outer diameter _D5 of the base body 1. A permanent magnet 27 is attached to one of the mutually opposing end surfaces of the protrusion 23, and a ferromagnetic material 28 such as iron is attached to the other. However, both may be made of permanent magnets, with magnetic poles of opposite polarity facing each other. When wearing this vapor deposition mask, the two semi-cylindrical bodies 22 are placed over the base body 1 and the support shaft 4 from both directions perpendicular to the axial direction of the base body 1 fitted on the support shaft 4. In that case, the magnet 27 and the ferromagnetic body 28 are attracted to each other, and the protrusions 23 of both semicylindrical bodies 22 are in close contact with each other at their end faces, and at the same time, the inner diameter surface of the protrusion 23 is in close contact with the outer diameter surface of the support shaft 4. On the other hand, put the inner side of the protrusion 24 into the groove 3,
The inclined surface 25 is moved axially and brought into contact with the outer edge 11 of the groove 3 on the center side of the base body, and is fixed in that position by suitable means. In this case, the inner side surface 29 of the protrusion 23
If a gap is left between the end surface 12 of the base body 1 and the inner side surface 30 of the protrusion 24 and the side surface 13 of the groove 3 on the end surface 12 side, D ₄ >D ₅ , D ₃ >D ₂
Therefore, the mask 1 can be easily attached to the base body 1 and the support shaft 4. As a result, the inside of the groove 3 of the base 1 and the space extending from the groove 3 between the outer surface of the end face 12 and the mask 2 are completely isolated from the atmosphere in the vapor deposition tank, so there is no infiltration and adhesion of the vapor of the vapor deposition material, and the space is clean. A non-evaporated surface can be obtained.

As described above, the present invention divides the vapor deposition mask into two parts, and provides a protrusion toward the inner surface that enters the annular groove of the base and abuts the outer edge of the side surface of the groove by the inclined surface. By connecting the two halves together by magnetic force, they can be easily attached from both directions perpendicular to the axial direction, even if the mask is made of the same material as the base, completely preventing vapor from entering the groove. It can be used extremely effectively as a mask for selective deposition without fear of damaging the substrate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an example of a conventional vapor deposition mask applied to a photoreceptor substrate, FIG. 2 is another sectional view, and FIG. 3 is a sectional view of an embodiment of the present invention. 1... Photoreceptor base, 2... Vapor deposition mask, 3...
Annular groove of base, 4... Support shaft, 23... First protrusion, 24... Second protrusion, 25... Inclined surface.

Claims (1)

[Scope of utility model registration request] A cylindrical electrophotographic photoreceptor substrate having an annular groove at the end is fitted onto a cylindrical rotating support shaft, and the portion including the annular groove at the end is covered when a photoconductive material is deposited on the substrate. , is a cylinder divided into two by a plane passing through the central axis, and the cylinder has a first protrusion on the inner surface side of one end, the inner diameter of which is equal to the outer diameter of the support shaft;
The inner surface of the other end has a second protrusion whose inner diameter is larger than the outer diameter of the bottom of the annular groove of the base body and smaller than the outer diameter of the base body, and the inner diameter of the intermediate part is smaller than the outer diameter of the part of the base body without the groove. The end surface of the cylinder on the side of the second protrusion has an inclined surface inclined toward the inner diameter side, and one of the mutually opposing surfaces of the first protrusion of each semi-cylindrical body has a magnet on one side and a strong force on the other side. The inner surface of the second protrusion is positioned within the groove of the base when the opposing surfaces of the first protrusion are brought into close contact with each other and the inner surface of the first protrusion is brought into close contact with the outer surface of the support shaft. The inclined surface may be in contact with the outer edge of the side surface of the groove on the side farther from the end surface of the base body, and in that case, between the side surface of the first protrusion part on the side of the second protrusion part and the end face of the base body and the second protrusion part. A mask for selective evaporation, characterized in that a gap is left between the side surface of the first protruding portion of the substrate and the side surface of the substrate groove of the substrate end surface side.