Title:
OPTICAL FILTER AND OPTICAL SYSTEM, IMAGE PICKUP APPARATUS, AND LENS APPARATUS WHICH INCLUDE THE SAME
Document Type and Number:
WIPO Patent Application WO/2017/029781
Kind Code:
A1
Abstract:
An optical filter that has a region where a transmittance changes in a first direction and that includes a substrate and a first layer in order along a second direction orthogonal to the first direction, a thickness of the first layer in the second direction changes in the first direction, and an extinction coefficient of the first layer satisfies a predetermined conditional expression.
Inventors:
KOGA HIRONOBU (JP)
Application Number:
PCT/JP2016/003577
Publication Date:
February 23, 2017
Filing Date:
August 03, 2016
Export Citation:
Assignee:
CANON KK (JP)
International Classes:
G02B5/00; G02B1/11; G02B5/30; G03B11/00; G03B17/12; G03B17/14
Foreign References:
| US0086014A | 1869-01-19 | |||
| JP2009175225A | 2009-08-06 | |||
| JP2006308810A | 2006-11-09 | |||
| US20060068226A1 | 2006-03-30 | |||
| JP2007178822A | 2007-07-12 | |||
| JP2013156619A | 2013-08-15 | |||
| US20150192783A1 | 2015-07-09 | |||
| JP2007178822A | 2007-07-12 | |||
| JP5067133B2 | 2012-11-07 | |||
| US20030086014A1 | 2003-05-08 | |||
| US20050186482A1 | 2005-08-25 | |||
| US7736742B2 | 2010-06-15 |
Other References:
See also references of EP 3289395A4
Attorney, Agent or Firm:
FUJIMOTO, Ryosuke (JP)
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