Image forming apparatus having an improved duplex printing ability
AssigneeSamsung Electronics Co., Ltd.
InventorByoung-chul BAE
Life of this patent
Estimating the term…
Abstract
An image forming apparatus which measures resistance of a recording medium on which an image formed and applies a transfer voltage corresponding to this resistance to the recording medium, thereby improving a duplex printing quality.
Claims20
A transfer voltage determination apparatus to use in an image forming apparatus including a photosensitive body on which developer is spread, a transfer unit which supplies a transfer voltage on a recording medium to form an image on both sides of the recording medium, and a fixing part to apply heat and/or pressure to the recording medium so as to fix the developer on the recording medium, the transfer voltage determination apparatus comprising:
- a first resistance measuring part, which is provided at the transfer unit, to measure a first resistance of the recording medium;
- a second resistance measuring part, which is provided at the fixing part, to measure a second resistance of the recording medium after the transfer unit forms the image on the first side;
- and
- a controller to control the transfer unit and the fixing part to supply to the transfer unit a first transfer voltage corresponding to the first resistance measured in the first resistance measuring part so as to form the image on the first side of the recording medium, and to supply to the transfer unit a second transfer voltage corresponding to the second resistance measured in the second resistance measuring part so as to form the image on the second side of the recording medium.
An image forming method to form an image on both sides of a recording medium, comprising:
- measuring a first resistance of the recording medium;
- supplying to the recording medium a first transfer voltage corresponding to the measured first resistance;
- transferring developer to a first side of the recording medium to form the image on the first side of the recording medium using the supplied first transfer voltage;
- measuring a second resistance of the recording medium on which the image is formed on the first side;
- applying heat and pressure to the recording medium to fix the transferred developer on the first side of the recording medium;
- supplying to the recording medium a second transfer voltage corresponding to the measured second resistance and
- transferring the developer to a second side of the recording medium to form the image on the second side of the recording medium using the supplied second transfer voltage.
An image forming method of an image forming apparatus having a photosensitive body on which developer is spread and a transfer unit which transfers the developer from the photosensitive body to a recording medium by applying a transfer voltage to the recording medium, and a fixing unit which fixes the developer on the recording medium, the method comprising:
- after measuring a first resistance of the recording medium, forming an image on the recording medium by supplying a first transfer voltage corresponding to the measured first resistance to the recording medium and transferring the developer from the photosensitive body to a first side of the recording medium;
- measuring a second resistance of the recording medium on which the image is formed on the first side, and fixing the developer on the first side of the recording medium to fix the image on the first side;
- and
- forming an image on a second side of the recording medium by supplying a second transfer voltage corresponding to the measured second resistance, and transferring the developer to the second side.
An image forming apparatus to perform single and/or duplex printing with respect to a recording medium, comprising:
- a first resistance measuring part to measure a first resistance of the recording medium;
- a transfer unit to impart to the recording medium a first transfer voltage corresponding the measured first resistance such that developer is transferred to a first side of the recording medium and, after the developer is fixed to the first side, to impart to the recording medium a second transfer voltage corresponding a measured second resistance such that developer is transferred to a second side of the recording medium;
- and
- a second resistance measuring part to measure the second resistance of the recording medium after the developer is fixed to the first side.
An image forming method to form an image on both sides of a recording medium, comprising:
- after measuring a first resistance of the recording medium, supplying to the recording medium a first transfer voltage corresponding to the measured first resistance to form the image on the first side of the recording medium;
- measuring a second resistance of the recording medium;
- and
- supplying to the recording medium a second transfer voltage corresponding to the measured second resistance to form the image on the second side of the recording medium.
An image forming apparatus to perform a duplex printing operation on a recording medium in which a resistance of the recording medium is measured after a first transfer voltage is applied to the recording medium to print an image on a first side thereof.
Dependencies are inferred from the claim text.