Title:
An imaging device which has a light volume adjustment device and it
Document Type and Number:
Japanese Patent JP6091048
Kind Code:
B2
Abstract:
A light quantity adjustment device includes: an aperture mechanism that varies an aperture opening through drive of aperture blades to restrict a quantity of light that passes through the aperture opening; and an ND filter inserted in and removed from an optical path on a light incident side or a light exit side of the aperture opening. The ND filter has a distribution of transmittance in which the transmittance differs in a direction of interposition of the ND filter in the optical path of the aperture opening, and includes a recessed portion formed by recessing a center portion of a distal-end region of the ND filter on a side of interposition in the optical path of the aperture opening in a direction opposite the direction of interposition.
Inventors:
Abe Daishi
Application Number:
JP2011025582A
Publication Date:
March 08, 2017
Filing Date:
February 09, 2011
Export Citation:
Assignee:
Canon Inc
International Classes:
G03B9/02; G02B5/00; G03B11/00
Domestic Patent References:
| JP2000106649A | ||||
| JP5281592A | ||||
| JP2009186673A | ||||
| JP2006208568A | ||||
| JP20083408A | ||||
| JP200412479A | ||||
| JP2007272174A | ||||
| JP200420711A | ||||
| JP200214384A | ||||
| JP2002311473A |
Attorney, Agent or Firm:
Yukio Takanashi