Image forming apparatus and image forming method
AssigneesToshiba Tec Kabushiki Kaisha, Kabushiki Kaisha Toshiba
InventorTakahiro HAMANAKA
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes a laser exposure device including plural laser oscillators, at least two pattern detection sensors to detect a pattern of forced light emission lines formed on a transfer belt by forced light emission of the plural laser oscillators at a time of initialization of the laser exposure device, and a shift amount calculation part to calculate a position shift amount between the forced light emission lines from output signals of the pattern detection sensors.
Claims20
An image forming apparatus comprising:
- a laser exposure device including a plurality of laser oscillators;
- at least two pattern detection sensors to detect a pattern of forced light emission lines formed on a transfer belt by forced light emission of the plurality of laser oscillators at a time of initialization of the laser exposure device;
- and
- a shift amount calculation part to calculate a position shift amount between the forced light emission lines from output signals of the pattern detection sensors.
An image forming apparatus comprising:
- a laser exposure device including a plurality of laser oscillators;
- at least two pattern detection sensors to detect a pattern of forced light emission lines formed on a transfer belt by forced light emission of the plurality of laser oscillators at a time of initialization of the laser exposure device;
- a shift amount calculation part to calculate a shift amount between the forced light emission lines from output signals of the pattern detection sensors;
- and
- a registration determination part to set a registration flag based on the shift amount.
An image forming method comprising:
- detecting, by two pattern detection sensors, both end positions of forced light emission lines on a transfer belt formed by forced light emission of laser oscillators for yellow, magenta, cyan and black at a time of initialization of a laser exposure device;
- calculating shift amounts of a magenta forced light emission line, shift amounts of a cyan forced light emission line, and shift amounts of a black forced light emission line with reference to both end positions of a yellow forced light emission line;
- correcting image inclination shifts of magenta, cyan and black based on differences between the shift amounts at both the end positions of the forced light emission lines;
- and
- correcting position shifts of magenta, cyan and black in a sub-scanning direction after the image inclination shifts are corrected.
Dependencies are inferred from the claim text.