JP2583038Y2 - Electrophotographic photoreceptor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic photoreceptor, and more particularly, to an earth structure thereof.

[0002]

2. Description of the Related Art An electrophotographic photosensitive member is obtained by forming a photosensitive layer on a conductive substrate, and it is necessary to ground the conductive substrate for image formation. When an aluminum tube is used as the base, grounding can be obtained relatively easily. However, when a glass tube is used, a device such as mounting an extraction electrode on the glass tube is required.

For example, an optical backside exposure recording system for forming an image by exposing an image signal from the back side of a photoreceptor (Journal of the Institute of Image Electronics Engineers of Japan, 16, (5), 306, (1987);
1-1149968, 63-10071,
In Japanese Patent Application Laid-Open No. 63-214781, etc.), the photosensitive drum is necessarily required to be light-transmissive. In general, a transparent conductive layer formed on a glass tube is used as a conductive substrate.

Conventionally, as a method for grounding such a glass tube base, as shown in FIG. 3, a copper tube 61 is fitted to a glass tube 51 having a transparent conductive layer formed thereon. Cuts are made in some places in the copper tube 61,
The notch is bent inward to form the claw 61a, and the claw 6
The grounding terminal which fixes the copper tube 61 by the elastic force of 1a, and establishes conduction at the contact surface between the claw portion 61a and the conductive layer (not shown). At 41 you can take the ground.

However, in the earth structure shown in FIG. 3, it is good if the copper tube 61 is integrally rotated by the rotation of the glass tube 51, but if it slips, it shifts in the longitudinal direction or idles. And the surface of the photosensitive drum may be damaged.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to an electrophotographic photosensitive drum in which an electrophotographic photosensitive drum using a glass tube base is reliably grounded and an accident such as damaging the surface of the photosensitive body is prevented. It provides the body.

[0007]

Electrophotographic photosensitive member of the present invention Means for Solving the Problems] includes a photosensitive drum using a glass tube forming the conductive layer as a conductive substrate, wherein the glass is attached to an end portion of the glass tube A glass tube holder that holds the tube and has two steps, and a plurality of conductive claws with elasticity are inside.
It comprises a conductive ring which projects bent in the direction, before
The photosensitive drum is provided with two steps on the glass tube holder.
And the conductive ring is fixed at a high step portion of the two step portions of the glass tube holding member.
Note that the conductive claw is pressed against the conductive layer of the photosensitive drum directly or against a conductive portion to the conductive layer by its elastic force.

[0008]

FIG. 1 is an explanatory sectional view showing an embodiment of the electrophotographic photosensitive member of the present invention. A transparent conductive layer and a photosensitive layer (both not shown) are formed on a glass tube 51 to constitute a photosensitive drum. The main holding member 11 and the sub holding member 21 (glass tube holding
Body) is fixed. The main holding member 11 is notched with a driving gear 13 to which a driving force from the outside is transmitted, while the sub holding member 21 is provided with a rear exposure light source L.
A through-hole 23 for inserting the ED shaft is provided. On the outer peripheral surface of the sub-holding member 21, a step 27 which is one step lower is formed, leaving the protrusion 25, and the conductive ring 31 shown in FIG. 2 is fixed here. That is, the auxiliary holding member 21
The (glass tube holder) has two steps. Soshi
The sub-holding member 21 is a glass tube 51 which is a photosensitive drum.
Is fixed at a low step portion of the two step portions.
In addition, the conductive ring 31 has a high step portion having two steps.
And is fixed to the sub-support member 21.

The conductive ring 31 is made of a metal such as copper or the like, and a plurality of conductive nail pieces 31a are cut and raised to protrude integrally. The conductive claw piece 31a has elasticity and is bent inward near the tip to form a bent portion. Reference numeral 31b denotes a screw hole for attachment to the sub-holding member 21. Reference numeral 31c denotes a cut portion of the conductive ring 31.

The conductive ring 31 is positioned by contacting the end face with the protruding portion 25, and the spacer ring 37 is provided.
And is fixed to the sub-holding member 21 with the screw 35 by floating from the step portion 27. Since the inwardly bent length of the conductive nail piece 31a is higher than the height of the spacer ring 37, the conductive nail piece 31a is pressed against the glass tube 51 at the bent portion by its elastic force, and a transparent conductive layer (not shown) on the glass tube 51 is formed. ) Is established. Since the conductive nail piece 31a is constantly pressed against the transparent conductive layer exposed on the glass tube 51 by its elastic force, conduction is maintained even if these contact portions change for some reason, and the transparent conductive layer And conductive nail piece 31
The contact surface with a is wide and can be taken reliably.
The earth can be taken as much as that.

After the sub-holding member 21 is attached to the glass tube 51, the conductive ring 31 is developed at the cut portion 31 c and wound around the outer peripheral surface of the step 27 of the sub-holding member 21. Since the conductive ring 31 can be attached, it is easy to assemble the earth structure. further,
The conductive claw piece 31a also contributes to the fixation and integration of the sub-holding member 21 with respect to the glass tube 51, and the followability of both in the axial direction and the rotation direction is improved.

Note that another conductive portion such as a metal electrode film may be interposed between the transparent conductive layer and the conductive nail piece 31a.

When the glass tube 51 is rotated, the conductive ring 21 is rotated accordingly, and the ground is taken by the ground terminal 41. Thus, the conductive ring 31
It functions as an earth extraction electrode in the photosensitive drum. At this time, since the conductive ring 31 is fixed to the sub-holding member, the conductive ring 31 is rotated.
It does not shift or idle.

[0014]

According to the electrophotographic photosensitive member of the present invention, since the conductive ring is fixed to the holder of the glass tube, there is no problem such as "displacement" due to the rotation of the conductive ring, and In addition, since the contact surface between the conductive nail piece and the conductive nail piece is wide, the ground surface can be reliably taken out. Further, the conductive ring does not run idle when the photosensitive drum rotates, and there is no possibility that the surface of the photosensitive drum is damaged.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of the electrophotographic photoreceptor of the present invention.

FIG. 2 is a perspective view showing an embodiment of a conductive ring 31.

FIG. 3 is an explanatory cross-sectional view showing a conventional ground extraction structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Main holding member 13 Driving gear 21 Sub holding member 23 Through hole 25 Projecting part 27 Step part 31 Conductive ring 31a Conductive claw piece 31b Screw hole 31c Cutting part 35 Screw 37 Spacer ring 41 Ground terminal 51 Glass tube 61 Copper tube

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03G 15/05 G03G 21/00 350

Claims (2)

(57) [Scope of request for utility model registration] 1. A photosensitive drum using a glass tube forming the conductive layer as a conductive substrate, mounted on the end of the glass tube to hold the glass tube, the glass having a stepped portion of the two-stage The tube holder and the plurality of conductive claws having elasticity are bent inward.
And a conductive ring protruded from the glass drum holder.
And the conductive ring is fixed at the high step portion of the two step portions of the glass tube holder, and the conductive claw piece has elasticity. An electrophotographic photoreceptor, wherein the photoreceptor is pressed against a conductive layer of the photoreceptor drum directly or against a conductive portion to the conductive layer by force. 2. The conductive ring is provided with a cut portion.
The ring can be deployed at the cutting part, and the ring has a threaded hole.
To be screwed to the glass tube holder.
The electrophotographic photosensitive member according to claim 1, wherein