发明名称 |
Image forming apparatus, control method therefor, and program for implementing the control method |
摘要 |
An image forming apparatus which is capable of eliminating density irregularities of an image formed caused by potential irregularities of the photosensitive member when the drum is irradiated by a beam of constant luminous intensity. A laser driver irradiates a beam modulated based on an image signal onto a photosensitive member. A current controller variably controls a driving current for driving the laser driver. A PWM pulse width converter modulates a pulse width of the beam based on the image signal. A potential sensor measures the potential of the photosensitive member after the photosensitive member is irradiated by a beam having a predetermined luminous intensity. A selector causes the current controller to correct the driving current based on low frequency components of irregularities of the potential and changes a modulation coefficient used for modulating the pulse width based on high frequency components of the irregularities of the potential.
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申请公布号 |
US7196717(B2) |
申请公布日期 |
2007.03.27 |
申请号 |
US20050057869 |
申请日期 |
2005.02.14 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
MORI AKIHITO;KAJI HAJIME;YAMADA NAOTO;YAMAZAKI YOSHITAKA;NOGUCHI JUNICHI;MOTOYAMA HAJIME;OGAWARA SATOSHI;OKA YUSHI;KAWAKAMI TAKAYUKI |
分类号 |
B41J2/47;B41J2/435;G03G15/00;G03G15/04;G03G15/043 |
主分类号 |
B41J2/47 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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