Image forming apparatus
AssigneeFuji Xerox Co., Ltd.
InventorsHideki Moriya, Chikaho Ikeda, Hidehiko Yamaguchi, Masao Ohmori
Life of this patent
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Abstract
An image forming apparatus including a photoreceptor that rotates, a charging member provided in contact with or in close proximity of the photoreceptor to charge the photoreceptor, a charge amount detecting portion that accumulates current flowing across the photoreceptor to obtain a charge amount of the photoreceptor, while the current is being applied from the charging member until a voltage on a surface of the photoreceptor substantially corresponds to the voltage applied by the charging member, and a controller that calculates a film thickness of the photoreceptor based on the charge amount.
Claims12
An image forming apparatus comprising:
- a photoreceptor that rotates;
- a charging member provided in contact with or in close proximity of the photoreceptor to charge the photoreceptor;
- a charge amount detecting portion that accumulates current flowing across the photoreceptor to obtain a charge amount of the photoreceptor, while the current is being applied from the charging member until a voltage on a surface of the photoreceptor substantially corresponds to the voltage applied by the charging member;
- and
- a controller that calculates a film thickness of the photoreceptor based on the charge amount.
An image forming apparatus comprising:
- a photoreceptor that rotates;
- a charging member provided in contact with or in close proximity of the photoreceptor to charge the photoreceptor;
- a charge amount detecting portion accumulates current flowing across the photoreceptor to obtain a charge amount of the photoreceptor, while the photoreceptor that has been charged is being discharged until a voltage on a surface of the photoreceptor substantially corresponds to a ground level;
- and
- a controller that calculates a film thickness of a photoreceptor with the charge amount.
An image forming apparatus comprising:
- a photoreceptor that rotates;
- a charging member provided in contact with or in close proximity of the photoreceptor to charge the photoreceptor;
- a capacitor having a known capacitance that is connected in parallel with the charging member;
- a current detecting member that detects a first current amount and a second current amount, the first current amount flowing into the capacitor, the second current amount flowing across the photoreceptor from the charging member;
- and
- a controller that detects a capacitance between the charging member and the photoreceptor with a ratio of the first current amount to the second current amount.
Dependencies are inferred from the claim text.