发明授权
- 专利标题： Flash protection controller
- 专利标题（中）： 闪存保护控制器
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申请号： US101368申请日： 1979-12-07
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公开(公告)号： US4282429A公开(公告)日： 1981-08-04
- 发明人: Lee K. Galbraith
- 申请人： Lee K. Galbraith
- 申请人地址： DC Washington
- 专利权人： The United States of America as represented by the United States Department of Energy
- 当前专利权人： The United States of America as represented by the United States Department of Energy
- 当前专利权人地址： DC Washington
- 主分类号： G02F1/055
- IPC分类号： G02F1/055 ; G02F1/01 ; H01J40/14
摘要：
A controller provides a high voltage to maintain an electro-optic shutter in a transparent condition until a flash of light which would be harmful to personnel is sensed by a phototransistor. The controller then shorts the shutter to ground to minimize light transmission to the user and maintains light transmission at the pre-flash level for a predetermined time to allow the flash to subside. A log converter and differential trigger circuit keep the controller from being triggered by other light flashes which are not dangerous.
公开/授权文献
- USD423667S Tongue depressor examination device with light 公开/授权日：2000-04-25
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