Photography – With exposure objective focusing means – focusing aid – or... – Dual purpose photoelement
Patent
1996-10-08
1997-09-09
Adams, Russell E.
Photography
With exposure objective focusing means, focusing aid, or...
Dual purpose photoelement
396448, G03B 1336, G03B 1700
Patent
active
056665687
ABSTRACT:
A lens cap in a camera is shaped so as to cover a distance measuring optical system when it is mounted on a taking lens. A photodiode array as a light receiving element for measurement of distance is utilized to obtain a luminance level of the light incident thereto, and it is compared with a luminance level obtained through a light receiving element for photometry. If a difference between the two luminance levels is large, a predetermined cap alarm process is carried out as determining that the lens cap is mounted on the taking lens. Thus, photography is surely prevented in a mounting state of the lens cap.
REFERENCES:
patent: 4349266 (1982-09-01), Maeda et al.
patent: 5309195 (1994-05-01), Goo et al.
Goto Shigenori
Saito Tatsuo
Adams Russell E.
Fuji Photo Optical Co., Ltd.
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