Invention Grant
- Patent Title: Light amount adjustment device, optical device, and image capturing apparatus
- Patent Title (中): 光量调节装置，光学装置和图像捕获装置
-
Application No.: US14823182Application Date: 2015-08-11
-
Publication No.: US09366941B2Publication Date: 2016-06-14
- Inventor: Takahito Yoshizawa , Kyousuke Miyashita
- Applicant: CANON DENSHI KABUSHIKI KAISHA
- Applicant Address: JP Chichibu-shi
- Assignee: Canon Denshi Kabushiki Kaisha
- Current Assignee: Canon Denshi Kabushiki Kaisha
- Current Assignee Address: JP Chichibu-shi
- Agency: Fitzpatrick, Cella, Harper & Scinto
- Priority: JP2013-046830 20130308; JP2013-097973 20130507
- Main IPC: G03B9/06
- IPC: G03B9/06 ; G03B9/14
Abstract:
A device according to the present invention includes at least one first light amount adjustment blade moving rectilinearly in a direction crossing a light passage direction and at least one second light amount adjustment blade pivoting within a plane crossing the light passage direction. When a light passage aperture of a polygonal shape formed by annularly superposing the first light amount adjustment blade and the second light amount adjustment blade is enlarged, a shape of the light passage aperture comes close to a circular shape from a polygonal shape.
Public/Granted literature
- US20150346583A1 LIGHT AMOUNT ADJUSTMENT DEVICE, OPTICAL DEVICE, AND IMAGE CAPTURING APPARATUS Public/Granted day:2015-12-03
Information query
