US 2011/0217064 A1 · HIGH-VOLTAGE OUTPUT APPARATUS AND IMAGE FORMING APPARATUS

Abstract

The high-voltage output apparatus includes a voltage application part that applies a DC voltage to the charge member; a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member; and a control part that calculates a plurality of discharge start voltages for the image bearing member, based on a plurality of current values detected by the current detection part as a result of the voltage application part applying a plurality of different DC voltages to the charge member, and controls the DC voltage applied to the charge member, using the plurality of calculated discharge start voltages. Consequently, a high-quality image can be formed by maintaining a potential on a photosensitive drum to be constant irrespective of the states of the circumstances and/or the drum layer thickness.

Claims6

Dependent claims

A high-voltage output apparatus that outputs a high voltage to a charge member that charges an image bearing member, comprising:

a voltage application part that applies a DC voltage to the charge member;
a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member;
and
a control part that calculates a first discharge voltage for the image bearing member based on a current value detected by the current detection part as a result of the voltage application part applying a first DC voltages to the charge member and a second discharge voltage for the image bearing member based on a current value detected by the current detection part as a result of the voltage application part applying a second DC voltages to the charge member, and controls the DC voltage applied to the charge member, using the first discharge voltage and the second discharge voltage.

1 more element

An image forming apparatus comprising:

an image bearing member on which a latent image is formed;
a charge member that charges the image bearing member;
and
a high-voltage output part that outputs a high voltage to the charge member,
wherein the high-voltage output part includes:
a voltage application part that applies a DC voltage to the charge member;
a current detection part that detects a value of a current flowing in the image bearing member when the DC voltage is applied to the charge member;
and
a control part that calculates a first discharge voltage for the image bearing member based on a current value detected by the current detection part as a result of the voltage application part applying a first DC voltages to the charge member and a second discharge voltage for the image bearing member based on a current value detected by the current detection part as a result of the voltage application part applying a second DC voltages to the charge member, and controls the DC voltage applied to the charge member, using the first discharge voltage and the second discharge voltage.

6 more elements

Dependencies are inferred from the claim text.

High-voltage output apparatus and image forming apparatus

Life of this patent

High-voltage output apparatus and image forming apparatus

Life of this patent

Abstract

Claims6