Shutter mechanism

Details Shutter mechanism Shutter mechanism

1988-01-22

1988-10-04

Mathews, A. A.

G03B 910

Patent

active

047758724

ABSTRACT:
An improved shutter mechanism is disclosed which is generally of the type wherein a shutter blade is mounted for pivotal opening movement and pivotal closing movement in opposite directions about a fixed pivot to uncover and recover a lens opening, wherein a return spring biases the shutter blade in the direction of closing movement, and wherein a fixed stop is positioned to end closing movement of the blade. According to the invention, there is provided bounce control means for enabling the shutter blade to swing about the fixed stop rather than about the fixed pivot in response to a mechanical shock to the blade caused by the blade abruptly hitting the stop. This will change the direction of movement of the blade from the direction of opening movement and thereby prevent the mechanical shock from inducing the blade to bounce off the stop and uncover the lens opening. Thus, the possibility of an undesired second exposure as in prior art mechanisms is prevented.

REFERENCES:
patent: 3646870 (1972-03-01), Koleff
patent: 3672285 (1972-06-01), Stoneham
patent: 3816843 (1974-06-01), Couture
patent: 3840885 (1974-10-01), Yoshizaki

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