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US 5,665,500 AGranted
Electrophotographic photoconductor
AssigneeRicoh Company, Ltd.
InventorYasuo Suzuki
Life of this patent
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AssigneeRicoh Company, Ltd.
InventorYasuo Suzuki
Estimating the term…
An electrophotographic photoconductor includes an electroconductive support and a photoconductive layer formed thereon, which photoconductive layer may be made of a charge generation layer containing a charge generating material and a charge transport layer containing a charge transporting material formed thereon, with a protective layer containing a charge transporting material optionally provided on top of the photoconductive layer, with any of the photoconductive layer, the charge transport layer or the protective layer, which constitutes a surface top layer of the photoconductor, having an oxygen transmission coefficient of 4.0.times.10.sup.-11 cm.sup.3 .cndot.cm/cm.sup.2 .cndot.s.cndot.cmHg or less, and the charge transporting material for use in the surface top layer having a charge mobility of 1.times.10.sup.-5 cm.sup.2 /V.cndot.s or more at an electric field strength of 5.times.10.sup.5 V/cm.
An electrophotographic photoconductor, comprising an electroconductive support, and a photoconductive layer formed thereon as a surface top layer of said photoconductor, said photoconductive layer comprising a charge generating material and a charge transporting material, and having an oxygen transmission coefficient of 2.0.times.10.sup.-11 cm.sup.3 .cndot.cm/cm.sup.2 .cndot.s.cndot.cmHg or less, said charge transporting material having a charge mobility of 1.times.10.sup.-5 cm.sup.2 /V.cndot.s or more at an electric field strength of 5.times.10.sup.5 V/cm.
An electrophotographic photoconductor, comprising an electroconductive support, a photoconductive layer formed thereon which comprises a charge generation layer comprising a charge generating material, and a charge transport layer comprising a charge transporting material formed on said charge generation layer, serving as a surface top layer of said photoconductor, said charge transport layer having an oxygen transmission coefficient of 2.0.times.10.sup.-11 cm.sup.3 .cndot.cm/cm.sup.2 .cndot.s.cndot.cmHg or less, said charge transporting material having a charge mobility of 1.times.10.sup.-5 cm.sup.2 /V.cndot.s or more at an electric field strength of 5.times.10.sup.5 V/cm.
An electrophotographic photoconductor, comprising an electroconductive support, a photoconductive layer formed thereon which comprises a charge generating material and a charge transporting material, and a protective layer comprising a charge transporting material formed on said photoconductive layer, serving as a surface top layer of said photoconductor, said protective layer having an oxygen transmission coefficient of 2.0.times.10.sup.-11 cm.sup.3 .cndot.cm/cm.sup.2 .cndot.s.cndot.cmHg or less, said charge transporting material in said protective layer having a charge mobility of 1.times.10.sup.-5 cm.sup.3 /V.cndot.s or more at an electric field strength of 5.times.10.sup.5 V/cm.
Dependencies are inferred from the claim text.