发明授权
- 专利标题: Image forming apparatus including a pulse width modulator
- 专利标题(中): 图像形成装置,包括脉宽调制器
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申请号: US304666申请日: 1994-09-09
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公开(公告)号: US5495278A公开(公告)日: 1996-02-27
- 发明人: Yasuhiro Oda , Kazuhiko Arai , Kazuhiro Iwaoka
- 申请人: Yasuhiro Oda , Kazuhiko Arai , Kazuhiro Iwaoka
- 申请人地址: JPX Tokyo
- 专利权人: Fuji Xerox Co., Ltd.
- 当前专利权人: Fuji Xerox Co., Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX5-248474 19930910; JPX5-280713 19930115; JPX6-024977 19940128
- 主分类号: H04N1/29
- IPC分类号: H04N1/29 ; H04N1/405 ; H04N1/21
摘要:
In an image forming apparatus including a pulse-width modulating unit for subjecting an image-density signal to pulse-width modulation and an image-forming unit for forming an image in accordance with a pulse-width modulation signal outputted by the pulse-width modulating unit, an arrangement is provided such that the image is formed with a small number of lines when the image density is a low density, while the image is formed with a large number of lines when the image density is a medium/high density. In an example of the arrangement thereof, the pulse-width modulating unit has a unit for effecting modulation on the basis of a plurality of different modulation periods, and is provided with a selecting unit for selecting a modulation period of a pulse-width modulated wave to be outputted, in accordance with the image-density signal.