Light shield mechanism for quadrilateral opening

Details Light shield mechanism for quadrilateral opening Light shield mechanism for quadrilateral opening

1975-10-01

1976-08-31

Peters, Jr., Joseph F.

350272, G03B 900, G05D 2500

Patent

active

039785033

ABSTRACT:
A rotatable member overlying a relatively fixed member has a quadrilateral window corresponding to a similar quadrilateral window within the fixed member through which passes the pivot axis of the rotating member. The rotating member controls movement of a pair of shield blades movable towards and away from each other from opposite sides of the window within the fixed member such that light shielding of the optical path through the fixed member window is effected partially by overlapping of the window frame portion of the rotating member relative to the window frame portion of the fixed member and the remaining portion of the fixed window is covered by the shield blades.

REFERENCES:
patent: 2507149 (1950-05-01), Fuerst
patent: 2887027 (1959-05-01), Rentschler

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