发明授权
US5932861A Ambient light detector, light source lighting controlling device, and
reader
失效
环境光检测器，光源照明控制装置和读卡器
- 专利标题： Ambient light detector, light source lighting controlling device, and reader
- 专利标题（中）： 环境光检测器，光源照明控制装置和读卡器
-
申请号： US550839申请日： 1995-10-31
-
公开(公告)号： US5932861A公开(公告)日： 1999-08-03
- 发明人: Isao Iwaguchi , Shinichi Sato , Ichiro Shinoda
- 申请人： Isao Iwaguchi , Shinichi Sato , Ichiro Shinoda
- 申请人地址： JPX Kawasaki
- 专利权人： Fujitsu Limited
- 当前专利权人： Fujitsu Limited
- 当前专利权人地址： JPX Kawasaki
- 优先权： JPX6-269043 19941101; JPX7-273319 19951020
- 主分类号： G06K7/10
- IPC分类号： G06K7/10
摘要：
The present invention relates to an ambient light detector that detects a change in light amount of ambient light. The ambient light detector consists of ambient light detecting means for detecting light entering from circumferences and outputting an electrical signal corresponding to the light amount thereof; amplifying means for amplifying the output from the ambient light detecting means; signal producing means for producing a slice level signal based on the output from the amplifying means; comparing means for comparing the output of the amplifying means with the slice level signal; and judging means for judging the level of the output from the amplifying means and then outputting a control signal to control the amplifying factor of the amplifying means, according to the judging result. Ambient light can be stably detected without depending on installation mode or external environment.
公开/授权文献
- US5010651A Portable circular saw 公开/授权日：1991-04-30
信息查询
