Nippon Sheet Glass Company, Limited

Lei Cai

Katsuhide Shimmo

Yuichiro Kubo

Hitomi Masuda

Yoshihiro Takayanagi

A light-absorbing composition according to the present invention includes: a light absorber; a curable resin; and an alkoxysilane. The alkoxysilane includes a dialkoxysilane. Since the alkoxysilane of the light-absorbing composition includes the dialkoxysilane, desired flexibility is likely to be imparted to a light-absorbing layer owing to an organic functional group of the dialkoxysilane while a strong skeleton having a siloxane bond is formed in the light-absorbing layer.

Light-absorbing composition and optical filter

The light-absorbing composition according to the present invention includes: a light absorber made of a phosphonic acid represented by the following formula (A) and copper ion; and a curable resin. Alight-absorbing film having desired properties can be provided by curing a coating film of the light-absorbing composition. In the formula (A), Rto Rare each independently a hydrogen atom, a halogen atom, a hydroxy group, or a nitro group, and n represents an integer of 1 to 3.

Light-absorbing composition, light-absorbing film, and optical filter

The liquid composition for optical filters according to the present invention contains: a light absorber; at least one of an alkoxysilane and a hydrolysate of an alkoxysilane; a phosphoric acid ester; and a solvent. The light absorber is formed by a phosphonic acid having an aryl group bonded to a phosphorus atom and copper ion. In the liquid composition, a content of an organic solvent having a relative permittivity of 7 or less at 20° ° C. is 50 mass % or less.

Liquid composition for optical filters and optical filter

An infrared-cut filter () includes a near-infrared reflecting film () and an absorbing film (). The near-infrared reflecting film () and the absorbing film () have the following features (A) to (E); (A) 700 nm&#x2264;&#x3bb;(0&#xb0;, 70%)&#x3c;&#x3bb;(0&#xb0;, 20%)&#x2264;770 nm; (B) 650 nm&#x2264;&#x3bb;(40&#xb0;, 70%)&#x3c;&#x3bb;(40&#xb0;, 20%)&#x2264;720 nm; (C) &#x3bb;(40&#xb0;, 20%)&#x3c;&#x3bb;(40&#xb0;, 20%); (D) the spectral transmittance of light incident on the absorbing film () is 15% or less at &#x3bb;(0&#xb0;, 20%) and &#x3bb;(40&#xb0;, 20%); and (E) an average of the spectral transmittance of light incident on the near-infrared reflecting film () and an average of the spectral transmittance of light incident on the absorbing film () are 75% or more in the wavelength range of 450 to 600 nm.

Infrared-cut filter and imaging optical system

An infrared cut filter includes: a transparent dielectric substrate; an infrared reflecting layer formed on one surface of the transparent dielectric substrate and configured to reflect infrared light; and an infrared absorbing layer formed on the other surface of the transparent dielectric substrate and configured to absorb infrared light. The infrared absorbing layer is formed of a resin that contains infrared absorbing pigment. The infrared reflecting layer is formed of a dielectric multilayer film.

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Kanagawa, Japan

Lei Cai