Electrophotographic apparatus and process cartridge
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United States of America Patent
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Mar 9, 2004
Grant Date -
Mar 6, 2003
app pub date -
Jan 30, 2002
filing date -
Jan 31, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electrophotographic apparatus includes an electrophotographic photosensitive member comprising a support and a photosensitive layer thereon, a charging means for charging the photosensitive member, a multi-beam exposure means for illuminating the photosensitive member with a plurality of laser beams to form an electrostatic latent image on the photosensitive member, a developing means for developing the electrostatic latent image to form a toner image on the photosensitive member, and a transfer means for transferring the toner image from the photosensitive member to a transfer-receiving material. The electrophotographic apparatus is not equipped with a charge-removal means for uniformly charge-removing the photosensitive member in advance of operation of the charging means. Further, the photosensitive member has a photosensitive layer containing oxytitanium phthalocyanine and exhibits a charge mobility of 7.0.times.10.sup.-5 to 2.0.times.10.sup.-5 cm.sup.2 /volt.sec. As a result, the electrophotographic apparatus can provide a higher process speed and/or a higher resolution because of the multi-beam exposure means without causing a density difference regardless of laser beam emission state.
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