Camera capable of sensing deficiency in light quantity of flash

Details Camera capable of sensing deficiency in light quantity of flash Camera capable of sensing deficiency in light quantity of flash

1993-08-18

1994-10-18

Perkey, W. B.

354132, 35414911, 354268, G03B 1503, G03B 1738

Patent

active

053572971

ABSTRACT:
A camera capable of sensing and indicating insufficient flash illumination which can indicate lack of illumination when an object is far away and in a low brightness condition. A central processing unit CPU of the camera is connected to a switch block including a power switch, a first step release switch, a second step release switch, and a switch for sensing whether an auxiliary flash is mounted. The camera also includes an automatic distance measuring circuit, a brightness measuring circuit, an auxiliary flash, and an alarm. The CPU informs a user that the auxiliary flash should be used when it is determined that a brightness value is lower than a predetermined minimum brightness value and the object is too distant to be sufficiently illuminated.

REFERENCES:
patent: 4322141 (1982-03-01), Tominaga et al.
patent: 4544254 (1985-10-01), Egawa et al.
patent: 5136312 (1992-08-01), Weaver et al.
patent: 5202719 (1993-04-01), Taniguchi et al.

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