Electrophotographic photosensitive member, process cartridge and electrophotographic apparatus

• US 6,835,512 B2
• Filed: 12/19/2002
• Issued: 12/28/2004
• Est. Priority Date: 12/21/2001
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yoshimura, Kimihiro, Tanaka, Daisuke, Ikezue, Tatsuya, Morikawa, Yosuke, Nakata, Kouichi
• Primary Examiner(s): Goodrow, John L
• Application Number:
  US10/322,732
• Publication Number:
  US 20030186145A1
• Time in Patent Office: 740 Days
• Field of Search: 430/58.05, 430/58.65, 430/58.8, 430/59.6, 430/66, 399/176, 399/159
• US Class Current: 430/58.05
• CPC Class Codes: G03G 5/147 Cover layers

Abstract

An electrophotographic photosensitive member is disclosed in which a photosensitive layer and a protective layer are formed on a conductive substrate in that order. In this photosensitive member, when its surface is charged to −700 V under a 23° C./5% RH environment and irradiated with white light in a light quantity of 10 lux·sec, if the surface potential at the time 0.2 seconds have passed from the irradiation and the surface potential at the time 0.5 seconds have passed from the irradiation are defined as Vsl(0.2) and Vsl(0.5), respectively, the absolute value of Vsl(0.2) and the absolute value of Vsl(0.2)−Vsl(0.5) satisfy specific conditions.

Claims

1. An electrophotographic photosensitive member comprising, in this order, a photosensitive layer and a protective layer on a conductive substrate, the photosensitive layer comprising a binder resin, a charge-generating material and a first charge transport material and the protective layer comprising a cured resin and a second charge transport material, the photosensitive layer and the protective layer being in contact with each other, wherein the electrophotographic photosensitive member has Vsl(0.2) and Vsl(0.5) which are surface potentials of the electrophotographic photosensitive member, respectively, 0.2 second and 0.5 second after irradiation of the electrophotographic photosensitive member which has been charged to −

700V with white light in a quantity of 10 lux.sec under a 23°

C. and 75% RH environment and wherein Vsl(0.2) and Vsl(0.5) satisfy the following formulas (1) and (2),

2. The electrophotographic photosensitive member according to claim 1, wherein the Vsl(0.2) is 20 (V) or more and 70 (V) or less.

3. The electrophotographic photosensitive member according to claim 1, wherein the Vsl(0.2) is 20 (V) or more and 60 (V) or less.

4. The electrophotographic photosensitive member according to claim 1, wherein the protective layer has a thickness of 1 to 5.5 μ

m.

5. The electrophotographic photosensitive member according to claim 1, wherein the photosensitive layer contains hydroxygallium phthalocyanine.

6. A process cartridge comprising the electrophotographic photosensitive member of claim 1 and a charging means which are integrally held together and are detachably mountable on a main body of an electrophotographic apparatus.

7. An electrophotographic apparatus comprising an electrophotographic photosensitive member of claim 1, a charging means, an exposure means, a developing means and a transfer means.