Light measuring device for a single lens reflex camera

Details Light measuring device for a single lens reflex camera Light measuring device for a single lens reflex camera

1984-02-16

1986-01-07

Perkey, William B.

354429, 354480, 354154, G03B 300, G03B 7099

Patent

active

045630682

ABSTRACT:
A light measuring device for a single lens reflex camera includes a principal or main mirror capable of dividing light passing through an objective lens towards a finder system and towards a film plane. A submirror is provided behind the main mirror and directs the light passed therethrough towards the film plane for ultimately determining a focusing condition and a measurement of light intensity. A pair of focus detecting photosensor arrays, as well as a spotlight measuring photocell, is arranged relative to the submirror to receive the object light. The auxiliary mirror can be formed with a center portion for reflecting the light through the photocell arrays and a second light-reflecting plane having light diffusive characteristics for directing light for the detection of light measurement.

REFERENCES:
patent: 4171154 (1979-10-01), Fukuhara
patent: 4322142 (1982-03-01), Kawamura et al.
patent: 4437741 (1984-03-01), Sato
patent: 4456352 (1984-06-01), Sato
patent: 4456354 (1984-06-01), Mizokami

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