Image forming apparatus and control method of image forming apparatus
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorYoshihisa MASUDA
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Abstract
An image forming apparatus includes first and second light sensors positioned in a laser scanning system of at least one color, such that scanned light is detected by the first light sensor and then by the second light sensor and light sensing surfaces of the first and second light sensors are not parallel, and a control unit connected to the first and second light sensors and configured to determine a time difference in the timing of light detection by the first and second light sensors and to execute a color position shift operation upon determining that the time difference is greater than a first threshold value.
Claims10
An image forming apparatus comprising:
- a polygon mirror configured to rotate to scan a light in a scanning direction;
- a first light sensor configured to detect the light reflected by the polygon mirror, the first light sensor having a longitudinal side crossing the scanning direction;
- a second light sensor configured to detect the light reflected by the polygon mirror, the second light sensor having a longitudinal side crossing the scanning direction, the light reflected by the polygon mirror passing both of the first light sensor and the second light sensor, a light sensing surface of the first light sensor being not parallel to a light sensing surface of the second light sensor;
- and
- a control unit configured to determine a difference between a first timing of detecting the light by the first light sensor and a second timing of detecting the light by the second light sensor and perform a color position shift operation based on the difference.
Dependencies are inferred from the claim text.