Transfer voltage control method of image forming apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorMyung-ho Kyung
Life of this patent
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Abstract
A transfer voltage control method of an image forming apparatus includes supplying a first measurement voltage to a first transfer member and a second transfer member, measuring a variation in resistance of the first transfer member by supplying a second measurement voltage to the first transfer member during a first period of time, and measuring a variation in resistance of the second transfer member by supplying the second measurement voltage during a second period of time. Therefore, it is capable of measuring accurately a variation in resistance of a transfer unit, such that an optimum transfer voltage may be set. Accordingly, transfer quality of an image forming apparatus is improved.
Claims17
A transfer voltage control method of an image forming apparatus, the method comprising:
- supplying a first measurement voltage to a first transfer member and a second transfer member;
- measuring a variation in resistance of the first transfer member by supplying a second measurement voltage to the first transfer member during a first period of time;
- and
- measuring a variation in resistance of the second transfer member by supplying the second measurement voltage to the second transfer member during a second period of time.
A transfer voltage control method of an image forming apparatus, the method comprising:
- supplying a first measurement voltage to a transfer drum and a transfer roller;
- measuring variation in resistance by supplying a second measurement voltage to the transfer drum during a first period of time;
- changing the second measurement voltage supplied to the transfer drum into the first measurement voltage;
- measuring a variation in resistance by supplying the second measurement voltage to the transfer roller during a second period of time;
- and
- releasing the voltage supplied to the transfer drum and the transfer roller.
A transfer voltage control method of an image forming apparatus, the method comprising:
- supplying a first measurement current to a transfer drum and a transfer roller;
- measuring a variation in resistance by supplying a second measurement current to the transfer drum during a first period of time T1;
- changing the second measurement current supplied to the transfer drum into the first measurement current;
- measuring a variation in resistance by supplying the second measurement current to the transfer roller during a second period of time;
- and
- releasing the current supplied to the transfer drum and the transfer roller.
An image forming apparatus, comprising:
- a developing unit to develop an image;
- a transfer unit to transfer the image, and having a first transfer member and a second transfer member;
- a high voltage power supply to transmit a transfer voltage to the developing unit and the transfer unit;
- a transfer voltage controlling unit including a power supply to supply a first measurement voltage to the first transfer member and the second transfer member;
- and
- a measuring unit to measure the variation in resistance of the first transfer member and the second transfer member, respectively,
- wherein the transfer voltage is an optimum transfer voltage that reflects accurately measured variations in resistances of the first transfer member and the second transfer member, respectively, and
- wherein the variation of the first transfer member and the second transfer member is measured by the power supply supplying a second measurement voltage to the first transfer member during a first period of time and to the second transfer member during a second period of time, respectively.
Dependencies are inferred from the claim text.