Frictionally controlled photographic camera apparatus such as a

Details Frictionally controlled photographic camera apparatus such as a Frictionally controlled photographic camera apparatus such as a

1981-01-19

1982-05-04

Adams, Russell E.

354230, 354252, 354256, 354271, G03B 714

Patent

active

043279775

ABSTRACT:
Photographic camera such as a reflex camera, of the type having at least one automatic region in which the diaphragm blades of a diaphragm blade aperture system, incorporated in the objective lens arrangement connected, e.g. in front of a light sensitive element for sensing ambient light, are adjustable from an initial position corresponding to the smallest diaphragm aperture width to a diaphragm aperture width adequate for the prevailing light conditions, in dependence upon such sensed ambient light, by means of a driving member or driving ring of an energizable driving system for the diaphragm blade aperture system which is energizable with electrical current pulses, e.g. via an electronic control circuit, in a continuous progressive adjustment movement, such that the continuous progressive adjustment movement of the diaphragm blades is effected under the continuous sliding frictional contact resistance of a spring loaded friction brake acting against the driving member for the diaphragm blades and securing the driving member simultaneously in the corresponding adjustment end position attained, e.g. in dependence upon such sensed ambient light, and which friction brake at the end of the camera exposure operation, i.e. after taking the photograph, is temporarily disengageable electromagnetically from its operative frictional contact position to permit the delay free, i.e. frictional contact free, return of the diaphragm blades back to the initial position thereof.

REFERENCES:
patent: 3820131 (1974-06-01), Tanaka
patent: 3847476 (1974-11-01), Onda et al.
patent: 3852786 (1974-12-01), Onda et al.
patent: 3871012 (1975-03-01), Haraguchi
patent: 3872488 (1975-03-01), Oshima
patent: 3956761 (1976-05-01), Koch et al.
patent: 3973269 (1976-08-01), Koch et al.
patent: 4054892 (1977-10-01), Nakagawa et al.

Affiliated with

Also associated with

Rating

Frictionally controlled photographic camera apparatus such as a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frictionally controlled photographic camera apparatus such as a , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frictionally controlled photographic camera apparatus such as a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-879889