发明授权
- 专利标题: Flash photographing system
- 专利标题(中): 闪光拍摄系统
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申请号: US723331申请日: 1985-04-15
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公开(公告)号: US4615599A公开(公告)日: 1986-10-07
- 发明人: Hiroyuki Kataoka , Masanori Yamada , Nobuyuki Suzuki
- 申请人: Hiroyuki Kataoka , Masanori Yamada , Nobuyuki Suzuki
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX56-196031 19811204; JPX56-207685 19811221; JPX57-1904 19820109
- 主分类号: G03B7/16
- IPC分类号: G03B7/16 ; G03B15/03
摘要:
A flash device for a photographic camera is arranged either to inhibit a flashing action or to shift the control mode of the camera from flash photography to daylight photography in cases where an object to be photographed is located outside of the adequately operatable range of distance. A pre-flashing action is performed to detect a distance to the object when a main capacitor is charged to a given level before the capacitor is amply charged for flash photography. Then flash photographing is performed at an aperture value determined on the basis of the detected distance when the distance is within the adequately operatable distance range. In the case where the detected distance is outside of the adequately operatable distance range, the main capacitor is further charged for an increased flashing power. After that, a distance to the object is again detected by a second pre-flashing action before the flash photographing is carried out at an aperture value determined on the basis of the distance detected by the second pre-flashing action. The flash photographing arrangement thus permits seizing a shutter chance in flash photographing an object located at relatively short distance without waiting until the main capacitor is amply charged.
公开/授权文献
- US5188441A Directional fastener assembly 公开/授权日:1993-02-23