Title:
OPTICAL FILTER MEMBER AND IMAGING APPARATUS
Document Type and Number:
Japanese Patent JP2018025732
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an optical filter member capable of satisfying both requests for enhancing degree of freedom of transmittance and reducing the thickness, which are difficult in conventional techniques.SOLUTION: An optical filter member 3 includes: a first light transmission film 32; a second light transmission film 33; and a third light transmission film 34. The average refraction index of the second light transmission film 33 is higher than the average refraction index of the first light transmission film 32. The wavelength range of visible light has a flat transmission characteristic, in a wavelength range of near infrared light, average transmittance is lower than that of a wavelength range of visible light. The average transmittance can be advantageously set using transmission characteristic of the third light transmission film 34. Thus, degree of freedom of the transmittance in the wavelength range of near infrared light is high and effective for reducing the size of an imaging apparatus.SELECTED DRAWING: Figure 2
Inventors:
NAKAO TAKAHIRO
Application Number:
JP2016188323A
Publication Date:
February 15, 2018
Filing Date:
September 27, 2016
Export Citation:
Assignee:
KYOCERA CORP
International Classes:
G02B5/28; G02B5/26; H01L27/14; H04N5/225
Domestic Patent References:
| JP2010191471A | 2010-09-02 | |||
| JP2010206626A | 2010-09-16 | |||
| JPS63161398A | 1988-07-05 |
Foreign References:
| WO2014065373A1 | 2014-05-01 | |||
| WO2016088644A1 | 2016-06-09 | |||
| WO2012098599A1 | 2012-07-26 |
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