Agc Inc.

Nanako Nishimoto

Kazuhiko Shiono

Satoshi Okada

Hiroki Hotaka

Keigo Matsuura

Sayuri Yamada

Takashi Nagata

Yuichiro Orita

Takuro Shimada

An optical filter including: a substrate; and a dielectric multilayer film laid on or above at least one major surface of the substrate as an outermost layer, in which the substrate includes a resin film including a dye (IR) and a resin, the dye (IR) has a maximum absorption wavelength in a wavelength of 680 to 800 nm in the resin, and the optical filter satisfies specific spectroscopic characteristics.

Optical filter

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 λwithin 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 λwhen the concentration is adjusted such that a transmittance at λis 10%, and λis 100 nm or less. (2) The dye (D2) has a maximum absorption wavelength λwithin a range of 720 to 770 nm. (3) A value obtained by subtracting λfrom λis 30 nm or more and 85 nm or less.

Optical filter and imaging device

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 &#x3bb;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 &#x3bb;when the concentration is adjusted such that a transmittance at &#x3bb;is 10%, and &#x3bb;is 100 nm or less. (2) The dye (D2) has a maximum absorption wavelength &#x3bb;within a range of 720 to 770 nm. (3) A value obtained by subtracting &#x3bb;from &#x3bb;is 30 nm or more and 85 nm or less.

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Fukushima, Japan

Nanako Nishimoto