Title:
光学フィルタ及び撮像装置
Document Type and Number:
Japanese Patent JP5677491
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an optical filter that prevents static electricity from being accumulated without using any transparent conductive film, and reduces deposition of a foreign matter on a surface of an imaging lens side of the optical filer.SOLUTION: An optical filter is constituted so as to include at least a birefringent quartz plate 300 which is a first optical member for removing a foreign matter deposited on a surface by giving vibration from the outside and a joined body which is a second optical member formed from an infrared absorption filter 301 and a depolarization plate 302. A conductive anti-reflection multilayer film 400 having conductivity and comprising a foreign matter deposition preventing film comprising material containing fluorine as the outermost layer is formed on a surface of an imaging lens 105 side of the first optical member. A dichroic multilayer film 401 having an infrared light and ultraviolet light cut effect is formed on a surface of an imaging element 106 side of the first optical member or on the surface of the imaging lens 105 side of the second optical member.
Inventors:
入江 良昭
Application Number:
JP2013054967A
Publication Date:
February 25, 2015
Filing Date:
March 18, 2013
Export Citation:
Assignee:
キヤノン株式会社
International Classes:
G02B5/20; G02B1/10; G02B1/11; G02B1/116; G02B5/26; H04N5/225