Photographic camera with through the lens exposure meter

Details Photographic camera with through the lens exposure meter Photographic camera with through the lens exposure meter

1978-01-30

1979-12-25

Gellner, Michael L.

G03B 700

Patent

active

041803124

ABSTRACT:
Photographic camera with through the lens exposure metering where the exposure meter is equipped with a silicon- or gallium-arsenide-phosphorus-diode mounted in the space behind the objective and receiving the light. The exposure meter is switchable between integrating and selective metering mode. Two optical systems (12,13) are mounted in front of the light-sensitive diode (10) and are located in the illumination beam being measured. Either of the optical systems is selectively brought into position into the beam in front of the diode (10). One of the systems, namely (13), guides the light from almost the entire object space onto the diode (10). The other system (12) guides only light from a restricted sector of the object space onto the diode (10). By connecting a light intensity attenuator (13a) with the integrating metering system, where the attenuator is moved into the illumination beam being metered together with the integrating system, the attenuator serves to achieve equal illumination intensities on the diode (10) for both the integrated and the selective measurements.

REFERENCES:
patent: 3532043 (1970-10-01), Shimomura
patent: 4065777 (1977-12-01), Maitani et al.

Affiliated with

Also associated with

Rating

Photographic camera with through the lens exposure meter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photographic camera with through the lens exposure meter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photographic camera with through the lens exposure meter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2068655