Light shielding structure of an optical device

Details Light shielding structure of an optical device Light shielding structure of an optical device

2011-01-18

2011-01-18

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07872810

ABSTRACT:
A light shielding structure of an optical device includes outer and inner annular members which move relative to each other in an axial direction, small and large diameter outer peripheral portions formed on the inner annular member, and a light shielding ring positioned inside the outer annular member and supported thereby. The light shielding ring does not contact the small-diameter outer peripheral portion of the inner annular member. The light shielding ring and the large-diameter outer peripheral portion of the inner annular member coincide with each other in the axial direction in an operating state of the optical device whereby a clearance between the outer annular member and the inner annular member is made light-tight. The light shielding ring and the small-diameter outer peripheral portion of the inner annular member coincide with each other in the axial direction in a non-operating state of the optical device.

REFERENCES:
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patent: 7625140 (2009-12-01), Miya
patent: 2004/0070849 (2004-04-01), Tanaka
patent: 2004/0156181 (2004-08-01), Nomura et al.
patent: 2006/0034595 (2006-02-01), Yamazaki et al.
patent: 2007/0127910 (2007-06-01), Miya
patent: 2007/0269204 (2007-11-01), Miya et al.
patent: 2007-183685 (2007-07-01), None
U.S. Appl. No. 12/369,161 to Nomura et al., filed Feb. 11, 2009.
U.S. Appl. No. 12/369,194 to Nomura et al., filed Feb. 11, 2009.
U.S. Appl. No. 12/369,231 to Nomura et al., filed Feb. 11, 2009.

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