Title:
LIGHT QUANTITY ADJUSTMENT DEVICE AND OPTICAL APPARATUS
Document Type and Number:
WIPO Patent Application WO/2013/005439
Kind Code:
A1
Abstract:
[Problem] To suppress increase in size in the radial direction of a light quantity adjustment device having an aperture blade and a shutter blade, and to make same more compact in the optical axis direction. [Solution] A light quantity adjustment device (10) (Fig. 1) has: an aperture blade (3) having an aperture section (3a) for increasing and decreasing the amount of light passing through light passage openings (12, 13, 28), and a supported section (3b); and a shutter blade (21) having a shutter section (21a) for blocking the passage of light in the light passage openings, and a supported section (21b). The supported sections in the aperture blade and the shutter blade each have a slope (α,β) on the same side in the optical axis direction relative to an opening surface (P), such that the aperture section and the shutter section are separated in the optical axis direction from their respective supported sections. In addition, a drive member (2) has a recessed shape on one side, from the outer peripheral side through to the inner peripheral side. As a result, a recessed space (S) facing the light passage openings is formed further on the inside in the radial direction than the aperture blade, the drive member, and the shutter blade.
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Inventors:
KOZU SATOSHI (JP)
KAWAKUBO NAOKI (JP)
KUROSAWA AKIRA (JP)
SHIBATA MITSUO (JP)
KAWAKUBO NAOKI (JP)
KUROSAWA AKIRA (JP)
SHIBATA MITSUO (JP)
Application Number:
PCT/JP2012/004373
Publication Date:
January 10, 2013
Filing Date:
July 05, 2012
Export Citation:
Assignee:
CANON DENSHI KK (JP)
KOZU SATOSHI (JP)
KAWAKUBO NAOKI (JP)
KUROSAWA AKIRA (JP)
SHIBATA MITSUO (JP)
KOZU SATOSHI (JP)
KAWAKUBO NAOKI (JP)
KUROSAWA AKIRA (JP)
SHIBATA MITSUO (JP)
International Classes:
G03B9/06; G02B7/02; G02B7/08; G03B9/02; G03B9/26
Foreign References:
| JP2007094074A | 2007-04-12 | |||
| JPH02153334A | 1990-06-13 | |||
| JP2005084605A | 2005-03-31 | |||
| JP2007500869A | 2007-01-18 | |||
| JP2009204423A | 2009-09-10 | |||
| JP2006053409A | 2006-02-23 | |||
| JP2007310412A | 2007-11-29 | |||
| JP2004184486A | 2004-07-02 | |||
| JPH02153334A | 1990-06-13 | |||
| JP2007094074A | 2007-04-12 |
Other References:
See also references of EP 2730974A4
Attorney, Agent or Firm:
FUJIMOTO, RYOSUKE (JP)
Ryosuke Fujimoto (JP)
Ryosuke Fujimoto (JP)
Download PDF:
Claims: