Patent
1979-08-24
1981-03-31
Griffin, Donald A.
G03B 902
Patent
active
042589967
ABSTRACT:
A diaphragm control mechanism for a camera objective wherein the diaphragm aperture is maintained fully open before camera operation in order to facilitate framing and focusing of the objective system and is then stopped down in response to a camera release operation to a value manually preset or automatically determined. The fully open diaphragm aperture is adjusted in accordance with movement of a component or components of the objective for the sake of adjustment of the objective, for example, to change its focal length. The improvement according to the present invention lies in the construction of the fully open diaphragm aperture adjusting mechanism wherein a movable member which is included in the link system for the stopping down of the diaphragm bears against a periphery cam or cam edge of a fixed member fixedly mounted in the lens barrel of the objective independently of the link system so that the fully open diaphragm aperture is adjusted as a function of the contact point between the movable member and the cam, with the movable member being allowed to move away from the cam upon the diaphragm stopping down operation of the link system.
REFERENCES:
patent: 3013478 (1961-12-01), Gebele
patent: 3098421 (1963-07-01), Ohara
patent: 3906529 (1975-09-01), Filipovich
patent: 3997906 (1976-12-01), Kashiwase
patent: 4141636 (1979-02-01), Shimojima
Tanaka Osamu
Uesugi Kyozo
Griffin Donald A.
Minolta Camera Kabushiki Kaisha
LandOfFree
Diaphragm control mechanism for camera objectives does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Diaphragm control mechanism for camera objectives, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diaphragm control mechanism for camera objectives will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2240265