Title:
ズームレンズ鏡筒
Document Type and Number:
Japanese Patent JP5306911
Kind Code:
B2
Abstract:
A zoom lens includes a zoom optical system including movable lens groups for zooming which are moved between a ready-to-photograph position and an accommodated position, a diaphragm mechanism, and a lens shutter. One of the movable lens groups serves as an aperture-control lens group. The diaphragm mechanism and the lens shutter are positioned in front of and behind the aperture-control lens group and are movable relative to the aperture-control lens group in the optical axis direction. The diaphragm and the lens shutter are moved to close positions to the aperture-control lens group when the movable lens groups are moved to the accommodated position. Both apertures of the diaphragm mechanism and of the lens shutter are widely opened to allow the aperture-control lens group to partly enter the apertures when the diaphragm mechanism and the lens shutter are moved to the close positions.
Inventors:
Hiroshi Nomura
Application Number:
JP2009138585A
Publication Date:
October 02, 2013
Filing Date:
June 09, 2009
Export Citation:
Assignee:
HOYA CORPORATION
International Classes:
G02B7/10; G02B7/02; G03B5/00; G03B9/06; G03B9/10; G03B17/04
Domestic Patent References:
| JP2002174838A | ||||
| JP2007310412A | ||||
| JP2004184811A |
Attorney, Agent or Firm:
Kunio Miura
Daisuke Ando
Daisuke Ando