Partial infrared filter exposure compensation apparatus

Details Partial infrared filter exposure compensation apparatus Partial infrared filter exposure compensation apparatus

1980-10-22

1981-12-08

Hix, L. T.

354 59, 354126, G03B 7083, G03B 1503

Patent

active

043044760

ABSTRACT:
A camera includes (1) a socket for detachably receiving a flashbulb, (2) a sensing member, coupled to the socket, for sensing a flashbulb, and (3) a photosensor, responsive to visible light and infrared (IR), for controlling an exposure in accordance with the visible light and IR passing along a light path to the photosensor during an exposure interval. A full IR-attenuating filter, responsive to the sensing member, is normally biased into alignment with the light path for effectively blocking IR from impinging upon the photosensor when an exposure is made solely in ambient light, and is positioned outside the light path when a flash exposure is made. A partial IR-attenuating filter (800 nanometers and above), coupled to the sensing member, is located in the optical path while a flashbulb is in the socket to allow the prevailing IR between 700 and 800 nanometers to influence the control of a flash exposure.

REFERENCES:
patent: 3205802 (1965-09-01), Wareham
patent: 3455218 (1969-07-01), Eagle et al.
patent: 4003062 (1977-01-01), Galbraith, Jr.
patent: 4040070 (1977-08-01), Hochreiter et al.
patent: 4059836 (1977-11-01), Hochreiter et al.

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