Solid-state image capture element optical filter and application thereof

Patent metadata

Field	Value
Publication number	US-9746595-B2
Application number	US-201314410466-A
Country	US
Kind code	B2
Filing date	Jun 20, 2013
Priority date	Jun 25, 2012
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

An object of the present invention is to provide a solid-state image capture element optical filter having excellent visible light transmission characteristics with reduced incidence angle dependence even in the near-ultraviolet wavelength region, in which the defects of conventional optical filters such as near-infrared cut filters are improved; and a device comprising the optical filter. The solid-state image capture element optical filter of the present invention comprises: a transparent resin substrate comprising a compound (X) having an absorption maximum in a wavelength range of 300 to 420 nm and a compound (Y) having an absorption maximum in a wavelength range of 600 to 800 nm; and a near infrared-reflecting film on at least one side of the substrate.

First claim

The invention claimed is:

1. A solid-state image capture element optical filter, comprising:
a transparent resin substrate which comprises a compound (X) having an absorption maximum in a wavelength range of 300 to 420 nm and a compound (Y) having an absorption maximum in a wavelength range of 600 to 800 nm; and
a near infrared-reflecting film on at least one side of said substrate;
wherein
an average transmittance in a wavelength range of 800 nm to 1,000 nm is at most 1%,
wherein the average transmittance in the wavelength range of 800 nm to 1,000 nm is measured under a condition that an incidence angle of incoming light is perpendicular to the optical filter.

2. The solid-state image capture element optical filter according to claim 1 , wherein said compound (X) is at least one selected from the group consisting of azomethine-based compounds, indole-based compounds, benzotriazole-based compounds and triazine-based compounds.

3. The solid-state image capture element optical filter according to claim 1 , wherein a maximum absolute value (U) of a difference between the transmittance in the vertical direction in a wavelength region of ±20 nm from a wavelength (H) at which the transmission of the optical filter is 50% in a wavelength region of 300 to 450 nm and a transmittance at 30° with respect to the vertical direction in the same wavelength region is less than 25%.

4. A solid-state imaging device, comprising the solid-state image capture element optical filter according to claim 1 .

5. A camera module, comprising the solid-state image capture element optical filter according to claim 1 .

6. The solid-state image capture element optical filter according to claim 1 , wherein an average transmittance in a wavelength range of 430 nm to 580 nm is 84% to 91%, wherein the average transmittance in the wavelength range of 430 nm to 580 nm is measured under a condition that an incidence angle of incoming light is perpendicular to the optical filter.

Assignees

• Jsr Corp

Inventors

• Nagaya Katsuya
• Tanaka Yukie
• Kishida Hiroyuki
• Mitsuboshi Ran

Classifications

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G03B11/00

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

• H04N5/2254

  Electricity · mapped topic

• G02B5/223 Primary

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

• C08L23/18

  Homopolymers or copolymers of hydrocarbons having four or more carbon atoms · CPC title