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AssigneeCanon Kabushiki Kaisha
InventorsDaisuke Tanaka, Yosuke Morikawa, Tatsuya Ikezue, Kouichi Nakata, Kimihiro Yoshimura
Estimating the term…
In an electrophotographic photosensitive member comprising a cylindrical support, and provided thereon a photosensitive layer and a protective layer in this order, which cylindrical support has an outer diameter of less than 30 mm, the difference between a coefficient of thermal expansion α1 measured from the top of the protective layer and a coefficient of thermal expansion α2 measured after the protective layer has been removed, |α1−α2|, is more than 5.0×10−7° C.−1 to less than 1.0×10−4° C.−1, and the modulus of elastic deformation We % measured from the top of the protective layer is more than 30% to less than 60%. Also disclosed are a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member.
An electrophotographic photosensitive member comprising a cylindrical conductive support, and provided thereon a photosensitive layer and a protective layer in this order, which cylindrical conductive support has an outer diameter of less than 30 mm, wherein;
A process cartridge comprising an electrophotographic photosensitive member and a means selected from the group consisting of a charging means, a developing means, a transfer means and a cleaning means which are integrally supported, and being detachably mountable to the main body of an electrophotographic apparatus, wherein;
An electrophotographic apparatus comprising an electrophotographic photosensitive member, a charging means, an exposure means, a developing means and a transfer means, wherein;
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Details relating to xerographic drum, band or plate, e.g. replacing, testing: relating to drum
Inert intermediate or cover layers for charge-receiving layers: cover layers
Electrography
Term ended 9 Dec 2022 (estimated)
1. Field of the Invention
This invention relates to an electrophotographic photosensitive member, and a process cartridge and an electrophotographic apparatus which have the electrophotographic photosensitive member. More particularly, it relates to an electrophotographic photosensitive member having on a cylindrical support a photosensitive layer and a protective layer in this order, which cylindrical support has an outer diameter of less than 30 mm; and a process cartridge and an electrophotographic apparatus which have such an electrophotographic photosensitive member.
2. Related Background Art
FIGS. 1A, 1B and 1C each illustrate the layer construction of the electrophotographic photosensitive member of the present invention.
FIG. 2 illustrates an example of the construction of an electrophotographic apparatus provided with a process cartridge having an electrophotographic photosensitive member, according to Embodiment 1 of the present invention.
FIG. 3 illustrates an example of the construction of an electrophotographic apparatus provided with a process cartridge having a means for feeding charging particles to an electrophotographic photosensitive member, according to Embodiment 2 of the present invention.
The present invention is described below in detail.
In the present invention, the coefficient of thermal expansion is measured with TMA/SS150, manufactured by Seiko Denshi Kogyo K.K. TMA/SS150 is an instrument for examining dimensional changes caused by thermal expansion and shrinkage of a sample. It can measure coefficients of expansion, glass transition, softening, expansion, stress or strain, stress relaxation and so forth.
In the measurement with TMA/SS150, the measurement in a penetration mode is selected taking account of the shape of the electrophotographic photosensitive member. A load is so applied at 500 mN that the needle may touch the photosensitive layer at a constant pressure of 49.03 mN, and how the needle moves up and down when the sample expands is plotted. Also, the measurement is made in a temperature range of from room temperature (23° C.) to 170° C. at a heating rate of 5° C./min.