Claims
- 1. An electrophotographic apparatus comprising:
- an electrophotographic photosensitive member and at least two image exposure means,
- said electrophotographic photosensitive member comprising a light-transmissive electroconductive substrate and a photosensitive layer on said substrate, said photosensitive layer comprising a charge generating material and a charge transporting material, photoconductive carriers formed by said charge generating material and said substrate being more in number than photoconductive carriers formed by said charge generating material and said charge transporting material,
- said image exposure means being means which irradiate image exposure light from a side of said substrate and from said photosensitive layer side, wherein photosensitivity of the electrophotographic photosensitive member to light irradiated from the substrate side is different from photosensitivity of the electrophotographic photosensitive member to light irradiated from the photosensitive layer side.
- 2. An electrophotographic apparatus according to claim 1, wherein the number of the photoconductive carriers formed by a difference between a work function of said charge generating material and a work function of said substrate is more than the number of the photoconductive carriers formed by a difference between the work function of said charge generating material and a work function of said charge transporting material.
- 3. An electrophotographic apparatus according to claim 1, wherein a difference in work function between said charge generating material and said substrate is 0.5 eV or more.
- 4. An electrophotographic apparatus according to claim 1, wherein said photosensitive layer has a charge generating layer and a charge transporting layer.
- 5. An electrophotographic apparatus according to claim 1, wherein said photosensitive layer is a single layer.
- 6. An electrophotographic apparatus according to claim 4, wherein said charge generating layer is a charge generating layer such that a product of the mobility of photoconductive carriers in cm.sup.2 /V.sec and a life of the photoconductive carriers in sec is 1.times.10.sup.-10 cm.sup.2 /V or more.
- 7. An electrophotographic apparatus according to claim 6, wherein the product of the mobility of photoconductive carriers in cm.sup.2 /V.sec and the life of the photoconductive carriers in sec is 1.times.10.sup.-8 cm.sup.2 /V or more.
- 8. An electrophotographic apparatus according to claim 5, wherein said photosensitive layer is a photosensitive layer such that a product of the mobility of photoconductive carriers in cm.sup.2 /V.sec and the life of the photoconductive carriers in sec is 1.times.10.sup.-10 cm.sup.2 /V or more.
- 9. An electrophotographic apparatus according to claim 8, wherein the product of the mobility of photoconductive carriers in cm.sup.2 /V.sec and the life of the photoconductive carriers in sec is 1.times.10.sup.-8 cm.sup.2 /V or more.
- 10. An electrophotographic apparatus according to claim 1, wherein said charge generating material is an organic compound.
- 11. An electrophotographic apparatus according to claim 1, wherein said substrate is shaped in sheet form.
- 12. An electrophotographic apparatus according to claim 1, wherein said substrate is shaped in drum form.
- 13. An electrophotographic apparatus according to claim 1, wherein said electrophotographic photosensitive member has an intermediate layer between said photosensitive layer and said substrate.
- 14. An electrophotographic apparatus according to claim 1, wherein said electrophotographic photosensitive member has a protective layer on said photosensitive layer.
- 15. An electrophotographic apparatus, comprising:
- an electrophotographic photosensitive member and at least two image exposure means,
- said electrophotographic photosensitive member comprising a light-transmissive electroconductive substrate and an organic photosensitive layer on said substrate, said organic photosensitive layer including a layer comprising a charge generating material and a charge transporting material, photoconductive carriers formed by said charge generating material and said substrate being more in number than photoconductive carriers formed by said charge generating material and said charge transporting material,
- said image exposure means being means which irradiate image exposure light from a side of said substrate and from a side of said photosensitive layer, wherein photosensitivity of the electrophotographic photosensitive member to light irradiated from the substrate side is different from photosensitivity of the electrophotographic photosensitive member to light irradiated from the photosensitive layer side.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-255324 |
Oct 1989 |
JPX |
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Parent Case Info
This application is a division of application Ser. No. 07/985,438 filed Dec. 3, 1992, now U.S. Pat. No. 5,338,632, which in turn is a continuation of application Ser. No. 07/591,761, filed Oct. 2, 1990, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (5)
Number |
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0339944 |
Nov 1989 |
EPX |
63-63052 |
Mar 1988 |
JPX |
63-240552 |
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63-240553 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
985438 |
Dec 1992 |
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Continuations (1)
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Number |
Date |
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Parent |
591761 |
Oct 1990 |
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