Developing apparatus, process cartridge and electrophotographic image forming apparatus
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United States of America Patent
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Jun 5, 2018
Issued Date -
Feb 1, 2018
app pub date -
Jul 14, 2017
filing date -
Jul 29, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
The developing apparatus includes a developer carrying roller rotatable in a first rotating direction, and a developer regulating member which regulates a thickness of a developer layer carried on the developer carrying roller, wherein at least a part of the developer regulating member is in pressure contact with a surface of the developer carrying roller to form an abutting portion between the developer carrying roller and the developer regulating member, the abutting portion having an abutting width W in a circumferential direction of the developer carrying member of 1.0 to 5.0 mm, wherein in the abutting portion, an abutting pressure has a maximum value in a first area, the first area having a width of 20% or less of the abutting width W from an upstream edge of the abutting portion in the rotating direction, and wherein an abutting pressure in a second area is 0.08 to 0.18 MPa.
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