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Optical filter

A filter and spectrum technology, applied in the direction of filter, optics, instruments, etc., can solve the problem that the filter cannot be fully satisfied, achieve small incident angle dependence, narrow the difference in spectral sensitivity, and high average transmittance Effect

Active Publication Date: 2016-05-18
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the optical filter described in Patent Document 3 cannot fully satisfy these requirements.

Method used

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Embodiment

[0213] Next, the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples.

[0214] [Evaluation]

[0215] The transmittance in each example was calculated by measuring the spectral transmittance curve using an ultraviolet-visible spectrophotometer (manufactured by Hitachi High-Technologies Co., Ltd., model U-4100).

[0216] The absorber U used in each example, its corresponding formula number, and λ measured by dissolving in methylene chloride max (UV), wavelength λ L90 , wavelength λ L50 and lambda L90 - lambda L50 Shown in Table 3. In Table 3, (U15) is an indole compound represented by the following formula (U15), and (U18) is a benzotriazole compound represented by the following formula (U18).

[0217] Absorber A uses squaraine A cyanine-based dye (A1, corresponding to A11-14 in the specification) and a cyanine-based dye (A2, manufactured by Few Chemicals, trade name: S2137).

[0218] [tabl...

example 9－1～ example 9－33

[0268] The ultraviolet absorber U or the ultraviolet absorber U and the near-infrared absorber A were mixed in the cyclohexanone solution of the transparent resin at the ratios shown in Tables 12 to 15 to prepare coating liquids. The coating solution was coated on a glass substrate by a spin coating method, and the solvent was heated and dried to form an absorption layer. The transmittance of the formed absorbing layer was measured using an ultraviolet-visible spectrophotometer (manufactured by Hitachi High-Technologies Co., Ltd., U-4100 model), and multiplied by the spectral data of the above-mentioned dielectric multilayer film to calculate the transmittance of the absorbing layer and the reflective layer. The respective optical characteristics of the filter for incident angles of 0° and 30°. The results are shown in Tables 12 to 15 together. Examples 9-1 to 9-19 are examples, and examples 9-20 to 9-33 are comparative examples.

[0269] [Table 12]

[0270]

[0271] *Pa...

example 10－1～ example 10－7

[0282] In the ratio shown in Table 16, the ultraviolet absorber U or the ultraviolet absorber U and The near-infrared absorber A was stirred sufficiently to dissolve it, and a coating liquid was prepared. Apply the coating solution to the other main surface (the surface opposite to the surface on which the reflective layer 13 is formed) of the above-mentioned glass substrate on which the reflective layer is formed by spin coating, and heat and dry the solvent to form a thickness 2.7 μm absorber layer.

[0283] The obtained spectral transmittance curves (incident angles 0° and 30°) of each optical filter were measured, and the respective optical characteristics were calculated from the measurement results. The results are shown in Table 16 together. Examples 10-1 to 10-3 are examples, and examples 10-4 to 10-7 are comparative examples. In addition, the spectral transmittance curve of Example 10-2 is shown in Figure 5 .

[0284] [Table 16]

[0285]

[0286] *Parts by m...

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Abstract

This invention provides an optical filter that exhibits a high average visible-light transmittance and a low angle-of-incidence dependence at wavelengths less than or equal to 500 nm. Said optical filter has a light-absorbing layer and a light-reflecting layer and satisfies the following conditions: (i) at an angle of incidence of 0 degree, this optical filter exhibits an average transmittance of at least 80% over the 430-620 nm wavelength range, an average transmittance of at least 76% over the 430-450 nm wavelength range, an average transmittance of at most 5% over the 735-1100 nm wavelength range, and an average transmittance of at most 5% over the 350-395 nm wavelength range; and (ii) there is a wavelength ([lambda]0(UV)) in the 400-425 nm wavelength range at which this optical filter exhibits a transmittance of 50% at an angle of incidence of 0 degree, there is a wavelength ([lambda]30(UV)) in the 400-425 nm wavelength range at which this optical filter exhibits a transmittance of 50% at an angle of incidence of 30 degrees, and the absolute value (|[lambda]0(UV)-[lambda]30(UV)|) of the difference between said wavelengths is less than or equal to 5 nm.

Description

technical field [0001] The present invention relates to an optical filter that selectively blocks light in a specific wavelength range. Background technique [0002] In recent years, optical filters that transmit light in the visible wavelength region but block light in the near-infrared wavelength region have been used in various applications. [0003] For example, in imaging devices such as digital still cameras, digital video cameras, and mobile phone cameras that use solid-state imaging elements (CCD, CMOS, etc.), and display devices such as automatic exposure meters that use light-receiving elements, in order to obtain good color reproducibility, use filter. The spectral sensitivity of a solid-state imaging device or a light receiving device is from an ultraviolet wavelength region to a near-infrared wavelength region, while human visibility is only in a visible wavelength region. In order to make the spectral sensitivity of the solid-state imaging device or the light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20B32B7/02G02B5/22G02B5/26G02B5/28
CPCB32B7/00B32B2307/40B32B2307/416B32B2551/00G02B5/223G02B5/282G02B5/208
Inventor 高桥麻奈盐野和彦有嶋裕之保高弘树
Owner ASAHI GLASS CO LTD
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