Controlling apparatus for developing roller, image forming device having the same, and developer controlling method thereof
AssigneeSamsung Electronics Co., Ltd.
InventorsJoong-Kwang Shin, Yu-Man Kim, Hae-Ree Joo
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Abstract
An image forming apparatus having a developer controlling apparatus for a developing roller is provided to uniformly control an amount of developer deposited on the developing roller and a developer controlling method thereof. The apparatus includes a sensing part having a first sensor which senses a conductivity of a liquid developer and a second sensor which senses a density of the liquid developer. A control part controls a voltage applied to the developing roller and/or a deposit roller according to the conductivity and the density sensed by the sensing part.
Claims23
A developer apparatus for a developing roller, comprising:
- a sensing part having a first sensor which senses a conductivity of liquid developer and a second sensor which senses a density of the liquid developer;
- a deposit roller for depositing the liquid developer to the developing roller to form a layer of developer;
- and
- a control part, which controls a voltage applied to at least one of the developing roller and the deposit roller according to the conductivity and the density sensed by the sensing part.
An image forming device comprising:
- an image forming unit having a developing roller for attaching a liquid developer to an electrostatic latent image to develop the electrostatic latent image into a visible image, and a deposit roller for depositing the liquid developer to the developing roller to form a layer of developer;
- and
- a developer controlling unit, which controls an amount of developer M/A deposited on the developing roller by the deposit roller;
- wherein the developer controlling unit comprises:
- a sensing part comprising a first sensor, which senses a conductivity of a liquid developer, and a second sensor, which senses a density of the liquid developer;
- and
- a control part, which controls a voltage applied to at least one of the developing roller and the deposit roller according to the conductivity and the density sensed by the sensing part.
A developer controlling method of an image forming device comprising the steps of:
- sensing a conductivity and a density of a liquid developer;
- controlling a voltage applied to at least one of a developing roller and a deposit roller according to the sensed conductivity and density;
- and
- employing the deposit roller to deposit the liquid developer to the developing roller to form a layer of developer.
Dependencies are inferred from the claim text.