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Optical filter and imaging device

An optical filter and wavelength technology, applied in chemical instruments and methods, optics, optical components, etc., can solve problems such as increased transmittance, increased visible light absorption, and failure to achieve high transmittance, excellent color reproducibility, Excellent blocking effect

Active Publication Date: 2016-11-09
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, in order to improve the transmittance of visible light, various squaraines with new structures have also been proposed. Pigment, but still not at a satisfactory level (Patent Documents 2, 3)
[0006] In addition, proposed in squaraine An optical filter in which a phthalocyanine-based dye is used in combination with a phthalocyanine-based dye (Patent Document 4), however, as the transmittance of visible light, there is no disclosure of a technology for improving the transmittance of light with a wavelength of 430 to 550 nm in particular.
Furthermore, since Patent Document 4 uses a plurality of different dyes, the absorption of visible light is additionally increased, and there is still a problem that high visible light transmittance cannot be obtained.

Method used

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Examples

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Embodiment

[0210] Next, the present invention will be further specifically described by way of examples. Example 1-1~Example 1~10, Example 2-1~Example 2~4, Example 3-1~Example 3~6 and Example 4-1~Example 4~10 are embodiments of the present invention, and other examples are comparative example.

[0211]

[0212] The dyes (A1-1) to (A1-26) used in Examples and the dyes (A2) to (A9) used in Comparative Examples were synthesized. The dyes (A1-1) to (A11-26) are dyes described in Tables 1 and 2 above, and the dyes (A2) to (A9) are dyes represented by formulas (A2) to (A9).

[0213]

[0214]

[0215] [Manufacture of pigment (A1-15)]

[0216] Hereinafter, a production example of the dye (A1-15) will be specifically described using the reaction formula (F1). In the following description, R in raw material components ((a), (g)) and intermediate products ((b) to (h)) 1 is isopropyl, R 2 is n-octyl (n-C 8 h 17 ), R 3 and R 4 for a hydrogen atom.

[0217] In the production of the d...

example 1－1～ example 1－14

[0281] The dyes shown in Table 5 were mixed with a 15% by mass cyclohexanone solution of a polyester resin (OKP850), and stirred and dissolved at room temperature to obtain a coating liquid. In addition, in Example 1-14, the dye A9 used was not dissolved in the resin solution, and the coating liquid could not be prepared. The obtained coating solution was applied on a glass (alkali-free glass; manufactured by Asahi Glass Co., Ltd., trade name: AN100) substrate with a thickness of 0.3 mm by spin coating, and dried by heating to form an absorption layer with a thickness of 0.9 to 1.0 μm. , to obtain NIR filters (Example 1-1 ~ Example 1-13).

example 2－1～ example 2－8

[0283] The dyes shown in Table 6 were mixed with a 15% by mass cyclohexanone solution of a cyclic olefin resin (manufactured by JSR Corporation, trade name: ARTON (registered trademark)), and stirred and dissolved at room temperature to obtain a coating. liquid. In addition, in Example 2-8, the dye A9 used was not dissolved in the resin solution, and the coating liquid could not be prepared. The obtained coating solution was coated on a glass (AN100) substrate with a thickness of 0.3 mm by spin coating, and heated and dried to form an absorption layer with a thickness of 0.9 to 1.0 μm to obtain a NIR filter (Example 2-1 to Example 2-7).

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Abstract

An optical filter is provided with an absorbing layer containing a near-infrared ray absorbing pigment the absorption characteristics of which in dichloromethane satisfy the following conditions: - An absorption spectrum of 400 nm - 800 nm contains a maximum absorption wavelength [lambda]max between 670 nm and 730 nm. - The maximum extinction coefficient [epsilon]A for light of wavelength 430 nm - 550 nm, and the maximum extinction coefficient [epsilon]B for light of wavelength 670 nm - 730 nm have the following relationship: [epsilon]B / [epsilon]A >= 65 - In a spectral transmittance curve, the difference is 65 nm or less between the maximum absorption wavelength [lambda]max, and the wavelength [lambda]80 the transmittance of which is 80 % in the wavelengths shorter than the maximum absorption wavelength in the case where the transmittance in the maximum absorption wavelength [lambda]max is 10 %.

Description

technical field [0001] The present invention relates to an optical filter that transmits visible light and blocks near-infrared light, and an imaging device equipped with the optical filter. Background technique [0002] In an imaging device using a solid-state imaging device such as a CCD or a CMOS image sensor mounted in a digital camera, an optical filter (near-infrared cutoff) that transmits visible light and blocks near-infrared light is used in order to reproduce color tones well and obtain sharp images. filter). In this optical filter, in particular, by using a pigment having high absorption in the near-infrared region and high transmittance in the visible region, a sharp blocking property against near-infrared light can be obtained, and an image formed by visible light can be obtained good color reproducibility. [0003] On the other hand, even if the two characteristics of high blocking of near-infrared light and high transmittance of visible light are to be obtai...

Claims

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Application Information

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IPC IPC(8): G02B5/22C09D5/32C09D7/12C09D201/00C09B57/00
CPCC09D7/41C09B23/105C09B57/007C09B67/0034C09D5/32C09D145/00C09D167/00C09D169/00C09D201/00G02B5/208G02B5/223H01L27/14621H01L27/14627H01L27/14645C08K5/3415C08K5/3417C08K5/0041G02B5/22G03B11/00G02B1/115G02B1/113G02B5/281H04N25/00
Inventor 盐野和彦松浦启吾保高弘树
Owner ASAHI GLASS CO LTD
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