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Patent Searching and Data


Title:
OPTICAL MEMBER
Document Type and Number:
Japanese Patent JP2011170391
Kind Code:
A
Abstract:

To prevent deterioration in pictures caused by reflected light and transmission light in the ridge lines of edges in an optical element composed of diaphragm blades and a ND (neutral density) filter.

The opening edge 16a of a diaphragm blade 16 forms an almost rhombic diaphragm opening cooperatively with the opening edge 17a of a diaphragm blade 17. Nonperiodic irregularities with various sizes are formed by fine saw-tooth shape along two ridge lines 16b, 16c before and behind the opening edge 16a. In the diaphragm blades 16, 17, when incident rays of light strike on the opening edges 16a, 17a, they are reflected to various directions by irregularities provided at the ridge lines 16b, 16c, 17b, 17c.


Inventors:
SAITO YASUNORI
NOZUE HITOSHI
Application Number:
JP2011128165A
Publication Date:
September 01, 2011
Filing Date:
June 08, 2011
Export Citation:
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Assignee:
CANON DENSHI KK
International Classes:
G03B9/02; G02B5/00; G03B11/00
Domestic Patent References:
JPS5612629A1981-02-07
JP2003004916A2003-01-08
JPH05281590A1993-10-29
JP2002229095A2002-08-14
JP2000301607A2000-10-31
JPH05281593A1993-10-29
JPS5612629A1981-02-07
JP2003004916A2003-01-08
Attorney, Agent or Firm:
Yasuhiko Hibiya