Photosensitive body for electrophotographical use and manufacturing method thereof

• US 5,773,175 A
• Filed: 02/28/1996
• Issued: 06/30/1998
• Est. Priority Date: 03/03/1995
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Maeda, Yasutaka, Sakamoto, Masayuki, Kurokawa, Makoto, Taniguchi, Hideaki, Tsugoshi, Masaya
• Primary Examiner(s): CHAPMAN, MARK A
• Application Number:
  US08/608,157
• Time in Patent Office: 853 Days
• Field of Search: 430/56, 430/130
• US Class Current: 430/56
• CPC Class Codes: G03G 15/10 using a liquid developer
• CPC Class Codes: G03G 15/751 relating to drum G03G15/757 takes precedence
• CPC Class Codes: G03G 5/04 Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
• CPC Class Codes: G03G 5/0525 Coating methods
• CPC Class Codes: G03G 5/10 Bases for charge-receiving or other layers
• CPC Class Codes: G03G 5/14 Inert intermediate or cover layers for charge-receiving layers G03G5/04 takes precedence

Abstract

A photosensitive body for electrophotographical use has a conductive base body and a marking area provided thereon. The maximum surface roughness of a photosensitive layer provided right on the marking area is specified not to exceed 2.5 μm. And also, a ratio of the optical reflective index of the marking area to the optical reflective index of the non-marking area is specified to be in a range of 0.3 to 0.7. In this manner, even when the photosensitive layer is thin (not exceeding 25 μm), it is possible to prevent problems such as inadequate cleaning and toner falling. Hence, it is possible to offer a photosensitive body for electrophotographical use which can constantly produce high quality copied images.

Claims

1. A photosensitive body for electrophotographical use, comprising:

a conductive base body having a first surface part and a second surface part, the second surface part having optical reflective characteristics different from those of the first surface part; and

a photosensitive layer provided on the conductive base body,

wherein the photosensitive layer right on the second surface part has maximum surface roughness of not more than 2.5 μ

m, and

a ratio of the optical reflective index of the second surface part to the optical reflective index of the first surface part is in a range of 0.3 to 0.7.

2. The photosensitive body as defined in claim 1,

wherein the photosensitive layer has a surface annealed at a temperature causing transition of the photosensitive layer to glass phase.

3. The photosensitive body as defined in claim 1,

wherein the second surface part is provided outside of an image forming area.

4. The photosensitive body as defined in claim 1,

wherein the photosensitive layer has a thickness not more than 25 μ

m.

5. The photosensitive body as defined in claim 1, wherein said second surface area has a rougher surface than said first surface area, and serves as a reference spot for measurement of toner image density.

6. The photosensitive body as defined in claim 5, wherein said second surface area is formed with a plurality of regularly spaced dots or pits.

7. The photosensitive body as defined in claim 6, wherein said dots are spaced apart at a first pitch (A) in a first direction and spaced apart at a second pitch (B) in a second direction, parallel to a gravity direction during application of a coating to said photosensitive body, and wherein

said first pitch is selected to be greater than said second pitch, thereby facilitating even application of said coating.