发明授权
- 专利标题: Photographic camera
- 专利标题(中): 摄影相机
-
申请号: US273724申请日: 1988-11-17
-
公开(公告)号: US4868595A公开(公告)日: 1989-09-19
- 发明人: Yoshihiro Tanaka , Sadafusa Tsuji , Yoshiaki Hata , Manabu Inoue , Hiroshi Ootsuka , Michihiro Iwata , Fumiaki Ishito , Koh Hayama
- 申请人: Yoshihiro Tanaka , Sadafusa Tsuji , Yoshiaki Hata , Manabu Inoue , Hiroshi Ootsuka , Michihiro Iwata , Fumiaki Ishito , Koh Hayama
- 申请人地址: JPX Osaka
- 专利权人: Minolta Camera Kabushiki Kaisha
- 当前专利权人: Minolta Camera Kabushiki Kaisha
- 当前专利权人地址: JPX Osaka
- 优先权: JPX61-29399 19860212
- 主分类号: G02B7/08
- IPC分类号: G02B7/08 ; G03B9/08 ; G03B9/10 ; G03B15/05 ; H02N2/06
摘要:
A photographic camera of the type including a piezo-electric actuating element driven by energy accumulated in a capacitor for actuating a shutter wherein the piezo-electric element operates in stability to assure accurate appropriate opening and closing operation of the shutter of the camera and the capacitor is charged up rapidly to allow subsequent photographing operation to be done in a minute. In the camera, a charged voltage of the capacitor is checked several times to determine if it is sufficient to assure proper operation of the piezo-electric element, and if a then required level is not reached, then the capacitor is charged to the required voltage. While the capacitor is being charged, charging of a capacitor for a flash is inhibited. For operation of the shutter, a negative voltage is first applied across the piezo-electric element to set the same to its fixed home position, and then a positive voltage is applied to move the shutter from the home position to a predetermined opening position, whereafter the negative voltage is applied again to return the shutter to its initial position rapidly. The position of the shutter is also checked to assure proper operation of the camera.
公开/授权文献
- US5483442A Accident documentation system 公开/授权日:1996-01-09
信息查询