发明授权
- 专利标题： Copying apparatus with moveable screen and method
- 专利标题（中）： 复制装置与移动屏幕和方法
-
申请号： US460586申请日： 1990-01-03
-
公开(公告)号： US5055877A公开(公告)日： 1991-10-08
- 发明人: Yasutaka Maeda , Natsuko Tanaka , Katsuhiro Nagayama , Hideyuki Nishimura
- 申请人： Yasutaka Maeda , Natsuko Tanaka , Katsuhiro Nagayama , Hideyuki Nishimura
- 申请人地址： JPX Osaka
- 专利权人： Sharp Kabushiki Kaisha
- 当前专利权人： Sharp Kabushiki Kaisha
- 当前专利权人地址： JPX Osaka
- 优先权： JPX1-2603 19890109; JPX1-34508 19890214
- 主分类号： G03G15/01
- IPC分类号： G03G15/01 ; G03G15/04 ; G03G15/06
摘要：
A copying apparatus in which a screen for improving gradation characteristics of a copied image can be retractably projected into an optical path, including a device for setting, when the screen is placed in the optical path and retracted from the optical path, a developing voltage to a first value and a second value, respectively such that the first value is lower than the second value.
公开/授权文献
- US5659583A Tone canceller for QAM demodulator 公开/授权日：1997-08-19
信息查询
