Light shield blades for light control device and light control d

Details Light shield blades for light control device and light control d Light shield blades for light control device and light control d

1982-09-24

1984-12-04

Mathews, A. A.

354249, 354250, 354264, 354274, G03B 940

Patent

active

044860846

ABSTRACT:
A light-shielding blade for use in a light control device, comprises a flat area and a recessed area on each face. The recessed area on one face is positioned substantially corresponding to the flat area on the other face. The light control device is for controlling a light-passing aperture and comprises a blade group composed of plural light-shielding blades movable between an extended state in which the plural blades are extended in a partially overlapping condition and a superposed state in which the plural blades are stacked in a substantially overlapping state. The blade group comprises at least a blade provided with a flat area and a recessed area on each face thereof. The recessed area on one face is positioned substantially corresponding to the flat area on the other face, and at least one of the flat areas is in overlapping contact with a neighboring blade in said extended state of the blade group.

REFERENCES:
patent: 3685423 (1972-08-01), Dahlgren
patent: 4044367 (1977-08-01), Dahlgren
patent: 4141634 (1979-02-01), Inoue
patent: 4298265 (1981-11-01), Tanaka et al.

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