Patent
1978-04-27
1979-10-16
Griffin, Donald A.
354152, G03B 708, G03B 1912
Patent
active
041711548
ABSTRACT:
A TTL metering device in a single lens reflex camera for measuring light passed through the picture-taking objective lens of the camera is disclosed. The TTL metering device comprises a light-sensing element for receiving the light and producing an output corresponding to the intensity thereof, a swing-up mirror rotatably movable between its first and second positions and a light reflecting means disposed behind the swing-up mirror. In order to broaden the distribution of sensitivity of the light-sensing element and also to keep the output thereof optimum, the light reflecting means is particularly designed. The light reflecting means comprises a reflection area composed of a plural number of mirrors regularly arranged and having directionally different reflecting characteristics and a light concentrating area disposed around the reflection area and formed by a plural number of ring mirrors arranged in a fashion of concentric circles, which light concentrating area has light concentrating and reflecting characteristics. The light reflecting means directs the light passed through the objective lens and the light-transmitting area of the swing-up mirror toward the light-sensing element.
REFERENCES:
patent: 2980001 (1961-04-01), Sauer et al.
patent: 4110765 (1978-08-01), Miyata et al.
Griffin Donald A.
Nippon Kogaku K.K.
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