Agc Inc.

Sayuri Yamada

Hiroki Hotaka

Kazuhiko Shiono

Satoshi Okada

Shoko Suzuki

Keigo Matsuura

Nanako Nishimoto

An optical filter, including a first absorption layer containing a near-infrared absorbing dye and a transparent resin. The optical filter also includes a reflection layer. The first absorption layer has a thickness of 0.3 μm to 10 μm. The optical filter satisfies conditions described in the disclosure. An imaging apparatus including the optical filter.

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 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.

The present invention relates to an optical filter containing: an absorption layer containing a near-infrared absorbing dye (A) having a maximum absorption wavelength in dichloromethane being in a wavelength range of 850 to 1,100 nm and a transparent resin; and a reflection layer formed of a dielectric multilayer film, in which the near-infrared absorbing dye (A) satisfies the following Formulae (1) to (4).ABS/ABS<0.10  (1),ABS/ABS<0.04  (2),ABS/ABS<0.15  (3), andABS/ABS<0.10  (4).

The present invention relates to an optical filter containing: an absorption layer containing a near-infrared absorbing dye satisfying the following (i-1) to (i-5), and a transparent resin; and a reflection layer, and satisfying the following (ii-1);

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

Sayuri Yamada