Infrared cut filter, solid-state imaging device, and imaging/display apparatus

Patent metadata

Field	Value
Publication number	US-10345498-B2
Application number	US-201514870751-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Apr 10, 2013
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

Provided is an infrared cut filter including: an infrared absorbing layer of a transparent resin containing an infrared absorber; and a selected wavelength cut layer stacked on the infrared absorbing layer, wherein the following requirements are satisfied. (i) In a spectral transmittance curve for an incident angle of 0°, an average transmittance in a 450-600 nm range is 80% or more, a transmittance in a 700-1200 nm range is 2.0% or less, and D0 represented by the following expression is less than 0.04. D0 (%/nm)=(Tmax·0−Tmin·0)/(λ(Tmax·0)−λ(Tmin·0)) (ii) wherein a spectrum transmittance curve for an incident angle of 30°, an average transmittance in the 450 to 600 nm range is 80% or more, a transmittance in the 700-1200 nm range is 2.0% or less, and D30 represented by the following expression is less than 0.04. D30 (%/nm)=(Tmax·30−Tmin·30)/(λ(Tmax·30)−×(Tmin·30))

First claim

What is claimed is:

1. An infrared cut filter comprising:
an infrared absorbing layer of a transparent resin comprising an infrared absorber; and
a selected wavelength cut layer stacked on the infrared absorbing layer;
wherein:
(i) in a spectral transmittance curve for an incident angle of “0” (zero) degree, the infrared cut filter has:
an average transmittance of 80% or more at wavelengths in a range of 450 to 600 nm;
a transmittance of 2% or less at all wavelengths in a range of 700 to 1200 nm; and
a transmittance variation D 0 represented by the following expression (1) of less than 0.04:
D 0 (%/nm)=( T max·0− T min·0)/(λ( T max·0)−λ( T min·0))  (1)

wherein Tmax·0 and Tmin·0 are respectively a maximum transmittance and a minimum transmittance at wavelengths in a range of 1100 to 1250 nm, λ(Tmax·0) is a wavelength having the maximum transmittance Tmax·0, and λ(Tmin·0) is a wavelength having the minimum transmittance Tmin·0; and
(ii) in a spectrum transmittance curve for an incident angle of 30 degrees, the infrared cut filter has:
an average transmittance of 80% or more at wavelengths in a range of 450 to 600 nm;
a transmittance of 2% or less at all wavelengths in a range of 700 to 1200 nm; and
a transmittance variation D 30 represented by the following expression (2) of less than 0.04:
D 30 (%/nm)=( T max·30− T min·30)/(λ( T max·30)−λ( T min·30))  (2)

wherein Tmax·30 and Tmin·30 are respectively a maximum transmittance and a minimum transmittance at wavelengths in a range of 1100 to 1250 nm, λ(Tmax·30) is a wavelength having the maximum transmittance Tmax·30, and λ(Tmin·30) is a wavelength having the minimum transmittance Tmin·30.

2. The infrared cut filter according to claim 1 , further comprising a transparent substrate supporting the infrared absorbing layer and the selected wavelength cut layer.

3. The infrared cut filter according to claim 1 , wherein:
(iii-1) in a spectral transmittance curve for the incident angle of “0” (zero) degree, the selected wavelength cut layer has:
a transmittance of 90% or more at all wavelengths in a range of 430 to 670 nm; and
a transmittance of 1% or less at all wavelengths in a range of λa to 1150 nm wherein λa is a maximum wavelength at which transmittance is 1% in a range of 670 to 800 nm;

(iii-2) in a spectral transmittance curve for the incident angle of 30 degrees, the selected wavelength cut layer has:
a transmittance of 90% or more at all wavelengths in a range of 430 to 650 nm; and
a maximum wavelength at which transmittance is 1% in a range of λb to 1200 nm of 1100 nm or more, wherein λb is a maximum wavelength at which transmittance is 1% in a range of 670 to 800 nm; and

(iii-3) the selected wavelength cut layer has a ratio [T 1200 (30)/T 1200 (0)] of 40 or less, where T 1200 (30) is a transmittance at a wavelength of 1200 nm in the spectral transmittance curve for the incident angle of 30 degrees, and T 1200 (0) is a transmittance at a wavelength of 1200 nm in the spectral transmittance curve for the incident angle of “0” (zero) degree.

4. The infrared cut filter according to claim 1 , wherein the infrared absorber has a light absorption spectrum at wavelengths in a range of 700 to 1300 nm when dissolved in a solvent having refractive index (n d ) of less than 1.5, and the light absorption spectrum has:
(iv-1) a maximum absorption wavelength λ max in a range of from 1100 to 1250 nm; and
(iv-2) a shortest wavelength at which an absorbance calculated by setting an absorbance at the maximum absorption wavelength λ max as one of 0.2 in a range 1000 nm or less.

5. The infrared cut filter according to claim 1 , wherein the infrared absorber comprises a compound having a dithiolene structure of the following general formula (1):

wherein M represents an metal atom, X 1 represents a bivalent organic group constituting a heterocycle (ring A) together with a sulfur atom, X 2 represents a bivalent organic group constituting a heterocycle (ring B) together with the sulfur atom, Z represents a compound represented by DR 1 R 2 R 3 R 4 wherein D represents a nitrogen atom, a phosphorus atom, or a bismuth atom, and each of R 1 , R 2 , R 3 and R 4 represents an alkyl group which may have a substituent group or an aryl group which may have the substituent group, and y represents “0” (zero) or 1.

6. The infrared cut filter according to claim 1 , wherein the transparent resin comprises at least one selected from a group consisting of an acrylic resin, an epoxy resin, an ene-thiol resin, a polycarbonate resin, a polyether resin, a polyarylate resin, a polysulfone resin, a polyethersulfone resin, a polyparaphenylene resin, a polyarylene ether phosphine oxide resin, a polyimide resin, a polyamideimide resin, a polyetyleneterephthalate resin, a polyethylenenaphthalate resin, a polyolefin resin, a cyclic olefin resin, and a polyester resin.

7. A solid-state imaging device comprising the infrared cut filter according to claim 1 .

8. An imaging/display apparatus comprising the infrared cut filter according to claim 1 .

Assignees

• Agc Inc

Inventors

• Yamamoto Kyoko
• Murakami Takaaki
• Tatemura Mitsuyuki
• Kumai Hiroshi

Classifications

• G03B11/00

  Filters or other obturators specially adapted for photographic purposes · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• G02B5/208 Primary

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• C09B57/10

  Metal complexes of organic compounds not being dyes in uncomplexed form · CPC title

• C09B49/12

  from other compounds {, e.g. other heterocyclic compounds} · CPC title