Optical filter and imaging device

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United States of America Patent

PATENT NO 11709298
APP PUB NO 20200200956A1
SERIAL NO

16808480

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Abstract

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An optical filter includes: an absorption layer including a first near-infrared absorbing dye (D1), a second near-infrared absorbing dye (D2), and a transparent resin; and a reflection layer including a dielectric multilayer film. The dye (D1) and the dye (D2) are squarylium compounds satisfying following (1) to (3). (1) The dye (D1) has a maximum absorption wavelength λmax(D1) within a range of 680 to 730 nm, and the difference between a wavelength at which a transmittance is 80% on the shorter wavelength side than λmax(D1) when the concentration is adjusted such that a transmittance at λmax(D1) is 10%, and λmax(D1) is 100 nm or less. (2) The dye (D2) has a maximum absorption wavelength λmax(D2) within a range of 720 to 770 nm. (3) A value obtained by subtracting λmax(D1) from λmax(D2) is 30 nm or more and 85 nm or less.

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Patent Owner(s)

Patent OwnerAddress
AGC INCCHIYODA-KU TOKYO 1008405

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hotaka, Hiroki Fukushima, JP 32 272
Matsuura, Keigo Tokyo, JP 27 91
Nishimoto, Nanako Fukushima, JP 5 3
Okada, Satoshi Tokyo, JP 287 3722
Shiono, Kazuhiko Fukushima, JP 46 187
Yamada, Sayuri Fukushima, JP 10 6

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