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Optical filter

A filter and wavelength technology, applied in the field of optical filters, can solve problems such as ripples in the visible light region, and achieve high near-infrared light barrier properties and the effect of suppressing changes

Pending Publication Date: 2022-05-27
ASAHI GLASS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Here, the conventional dielectric multilayer film is designed to suppress light leakage in the near-infrared region, but produces ripples in the visible region, and the considered incident angle is only up to about 30 degrees

Method used

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Embodiment

[0368] Next, the present invention will be described in more detail by way of examples.

[0369] An ultraviolet-visible spectrophotometer (made by Hitachi High-Technologies Co., Ltd., UH-4150 type) was used for the measurement of each optical characteristic.

[0370] In addition, the optical characteristics in the case where the incident angle is not particularly described are the values ​​measured under the condition that the incident angle is 0 degrees (direction perpendicular to the main surface of the filter).

[0371] The dyes used in each example are as follows.

[0372] Compound 1 (squaric acid Salt compound): synthesized according to the specification of US Patent Application Publication No. 2014 / 0061505 and International Publication No. 2014 / 088063.

[0373] Compound 2 (phthalocyanine compound): synthesized according to Japanese Patent No. 4081149 .

[0374] Compound 3 (squaric acid salt compound): synthesized according to International Publication No. 2017 / 1353...

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Abstract

Provided is an optical filter that has high visible light transmission and high near-infrared light barrier properties, that suppresses ripple even under conditions of high incidence angles, and that suppresses changes in near-infrared light barrier properties under conditions of high incidence angles. An optical filter having a substrate and a dielectric multilayer film laminated on at least one principal surface side of the substrate as an outermost layer, the substrate having a resin film containing a dye (IR) having a maximum absorption wavelength in the range of 680-1000 nm in dichloromethane and a resin, the dye (IR) having a maximum absorption wavelength in the range of 680-1000 nm in dichloromethane, and the dielectric multilayer film being laminated on at least one principal surface side of the substrate as an outermost layer, the dye (IR) having a maximum absorption wavelength in the range of 680-1000 nm in dichloromethane, and the resin (IR) having a maximum absorption wavelength in the range of 680-1000 nm in dichloromethane. The optical filter satisfies all specific optical characteristics (i-1) to (i-10) in a spectral transmittance curve under the condition that incident angles are 0 degree, 5 degrees, and 40 degrees.

Description

technical field [0001] The present invention relates to filters that transmit light in the visible wavelength range and block light in the near infrared wavelength range. Background technique [0002] In an imaging device using a solid-state imaging element, in order to obtain a clear image with good color tone reproduction, light in the visible region (hereinafter also referred to as "visible light") and blocking light in the ultraviolet wavelength range (hereinafter also referred to as "visible light") are used. Ultraviolet light") and light in the near-infrared wavelength range (hereinafter also referred to as "near-infrared light"). [0003] Such an optical filter includes, for example, a reflection that reflects light to be blocked by interference of light by alternately laminating dielectric thin films (dielectric multilayer films) with different refractive indices on one or both surfaces of a transparent substrate. Type filters and other types of filters. [0004] F...

Claims

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Application Information

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IPC IPC(8): G02B5/22G02B5/20
CPCG02B5/22G02B5/208
Inventor 折田雄一朗盐野和彦岛田拓郎长田崇
Owner ASAHI GLASS CO LTD
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