Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate
2005-08-02
2005-08-02
Thompson, Timothy (Department: 2873)
Optical: systems and elements
Lens
With light limiting or controlling means
C359S740000, C396S505000, C396S510000
Reexamination Certificate
active
06924946
ABSTRACT:
The present invention is directed to a lens diaphragm device that can avoid a degradation of an image due to both diffraction of a light beam and flares. The diaphragm device includes two diaphragm vanes (2and4) that respectively have notches (28and36) opposed to each other in a single plane perpendicular to an optical axis (O), and two of the vanes are moved close to and apart from each other in the single plane so as to vary an aperture of the lens diaphragm. The lens diaphragm device also includes two optical filters (6and8) used to reduce a quantity of a beam of light passing through the diaphragm, and an aperture of the diaphragm defined by edges of the optical filters and the notches of the vanes is shaped to be asymmetrical about straight line which crosses the optical axis and is perpendicular to directions of the motion of the vanes.
REFERENCES:
patent: 5394212 (1995-02-01), Morizumi
patent: 5479298 (1995-12-01), Yanagi et al.
patent: 5721995 (1998-02-01), Katsura et al.
patent: 08043878 (1996-02-01), None
patent: 2002-258346 (2001-02-01), None
patent: 2002258346 (2002-09-01), None
Inoue Michio
Miyauchi Yasunori
Watanabe Yuko
Jacobson & Holman PLLC
Tamron Co., Ltd.
Thompson Timothy
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