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1. 发明专利

JPS62163029A STROBOSCOPIC PHOTOGRAPHING ALARMING DEVICE 失效
公开(公告)号：JPS62163029A
公开(公告)日：1987-07-18
申请号：JP449286
申请日：1986-01-13
申请人： SEIKO KOKI KK
发明人： SEGAWA HISASHI , SATO KOJI , KOGO TAKASHI , NAKAJIMA YUJI , ITO KANJI , KONISHI YUSUKE , TAKAHASHI TAKUMA
IPC分类号： G03B7/16 , G03B15/05
摘要： PURPOSE:To previously prevent the generation of a photographing miss by detecting a step difference between exposure data based on the luminance of an object and an aperture data based on distance information and generating an alarm when the step differences is too large to photograph. CONSTITUTION:When a main object is positioned on the far distance position and the luminance of a background is high, the maximum aperture Fm of a lens based on exposure data is reduced, and the lens aperture data Fs is fixed by a guide number, so that the step differences Fs-Fm is increased. An alarm circuit 13b compares the step differences Fs-Fm of the lens aperture calculated by a step difference arithmetic circuit 13a with a reference level. When the step differences Fs-Fm exceeds the reference level, the circuit 13b outputs a signal to drive a display lamp 14 and inform the impossibility of photographing. Consequently, a photographer can reduce the step difference between the exposure data and aperture data as small as possible and take a picture based on proper exposure by shortening a distance up to the object or changing the composition of the picture.

2. 发明专利

JPS62163026A EXPOSURE CONTROL DEVICE FOR STROBOSCOPIC PHOTOGRAPHING 失效
公开(公告)号：JPS62163026A
公开(公告)日：1987-07-18
申请号：JP449386
申请日：1986-01-13
申请人： SEIKO KOKI KK
发明人： SEGAWA HISASHI , SATO KOJI , KOGO TAKASHI , NAKAJIMA YUJI , ITO KANJI , KONISHI YUSUKE , TAKAHASHI TAKUMA
IPC分类号： G03B7/16 , G03B7/28 , G03B9/70 , G03B15/05
摘要： PURPOSE:To prevent the titled device from the generation of a miss due to day photographing using a stroboscope as auxiliary light by delaying the output time of a close control signal based on exposure data when the aperture of a lens is so small as to photograph at the emitting of the stroboscope. CONSTITUTION:When the maximum aperture of the lens is Fm and the aperture of the lens is Fs, the step difference Fs-Fm of the lens aperture which is calculated by a step difference arithmetic circuit 13a based on exposure data and opening data is inputted to a correcting value determining circuit 13b and converted into a time signal proportional to the stop difference Fs-Fm and the time signal is inputted to the 1st time constant circuit 4. The circuit 4 delays an output time T3 of an aperture close control signal determined by exposure data obtained from an exposure arithmetic circuit 2 by a correction value DELTAT determined by the step difference Fs-Fm. A sector is transferred to a closing process at a time T4 delayed from the time T3 determined from the guide number of the stroboscope found out by an aperture value arithmetic circuit 7 only by a correcting value DELTAT. Consequently, the aperture of a shutter is increased and the aperture appropriate for stroboscopic photographing is formed to obtain exposure proper to a main object.

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