Optical Components

Abstract

To provide an optical member which has a function of selectively transmitting light of any different visible light wavelength and has low incident angle dependency, and a sensing device and an imaging apparatus each obtained using the optical members.SOLUTION: An optical member is provided which has at least one absorbing layer containing resin and an absorbing agent having an absorption maximum in a range of 380 to 725 nm in a wavelength. The absorbing layer has at least three or more blocking bands in the range of 380 to 725 nm in a wavelength. A maximum transmittance of each blocking band is 15% or less. A width of the blocking band on a longest wavelength side is 50 nm or more. The optical member has a transmission band between respective blocking bands. A minimum transmittance of each transmission band is 30% or more.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an optical element, and more particularly to an optical filter having three or more stop bands with predetermined characteristics. [Background technology]

[0002] Spectroscopic sensors are used in fields such as medicine, agriculture, and the environment to diagnose and inspect objects. For example, in the medical field, pulse oximeters are used to measure blood oxygen saturation using the light absorption of hemoglobin. In the agricultural field, saccharometers are used to measure the sugar content of fruit using the light absorption of sugar. Furthermore, to improve security levels, biometric authentication devices are used, such as authentication devices that use the iris of the eye at airports, facial recognition devices, and fingerprint authentication devices at bank ATMs.

[0003] As described above, in recent years, there has been active development of sensing devices and imaging devices that use light of any different visible wavelengths. It is desirable for the optical members used in these devices to be able to efficiently cut off light other than the desired wavelengths.

[0004] For example, Patent Document 1 (JP 2008-203436 A) discloses an optical component for a display panel that uses a specific methine dye to improve the contrast of light emitted from the three primary colors of red, blue, and green. However, it cannot be said that the component is able to sufficiently cut unnecessary visible light in the long wavelength range.

[0005] Furthermore, Patent Document 2 (Japanese Patent No. 4095344) proposes a filter with a specific laminated structure as an optical component for color reproduction in a liquid crystal projector, which has high transmittance in the ranges of 430 to 470 nm, 520 to 560 nm, and 610 to 650 nm, and low transmittance in the range between blue and green and the range between green and red. There is a concern that this trimming filter may cause erroneous authentication or poor image quality due to oblique incident light.

[0006] Patent Document 3 (Japanese Patent Laid-Open Publication No. 2010-002704) discloses an infrared transmission filter as an optical member for biometric authentication, but it cannot be used for sensing visible light. Furthermore, one method for selectively extracting any different visible light wavelength is to use a filter using a dielectric multilayer film, but this has the problem that the spectral characteristics change significantly when light rays enter the filter at an angle. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-203436 [Patent Document 2] Patent No. 4095344 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-002704 Summary of the Invention [Problem to be solved by the invention]

[0008] Regarding the dependency on the angle of incidence, depending on the application, the incident light may be incident at angles ranging from 0 degrees (0-degree incidence) to 45 degrees (45-degree incidence) from perpendicular to the surface direction, so it is desirable for the dependency on the angle of incidence to be low in these angle ranges.

[0009] In particular, in optical components used for sensing, imaging, etc. using light of any different visible wavelength, if the incidence angle dependency is high, when light rays are incident on the optical component at an angle, problems arise such as a deterioration in the signal-to-noise ratio (S / N ratio) used in the sensing function, as well as adverse effects on image quality and color reproducibility at the image edges. For this reason, there has been a demand for an optical component that has low incidence angle dependency and satisfies all aspects, such as good S / N ratio, image quality, and color reproducibility, while being able to selectively extract light of a desired wavelength.

[0010] An object of the present invention is to provide an optical element that has the function of selectively transmitting light of any different visible wavelengths and has low incidence angle dependency, and a sensing device, an imaging device, etc. that uses the optical element. [Means for solving the problem]

[0011] As a result of intensive research into achieving the above object, the inventors have found that the above object can be achieved by providing an optical component with an absorbing layer containing an absorbent having an absorption maximum at a specific wavelength, and have thus completed the present invention. Examples of aspects of the present invention are shown below. [1] An optical element having at least one absorbing layer containing an absorbent having an absorption maximum in the wavelength range of 380 to 725 nm and a resin, The absorption layer has at least three stop bands in the light wavelength range of 380 to 725 nm, The maximum transmittance of each stop band is 15% or less, and the width of the stop band on the longest wavelength side is 50 nm or more; An optical element having a transmission band between each blocking band, with the minimum transmittance of each transmission band being 30% or more. [2] The optical member according to [1], wherein the absorbing layer further contains one or more absorbents that are different from the absorbent and have an absorption wavelength in the wavelength range of 380 to 725 nm. [3] The optical member according to [1] or [2], wherein each of the transmission bands is in the range of 400 to 725 nm. [4] The optical member according to any one of [1] to [3], wherein the at least three stop bands are in the ranges of 380 to 530 nm, 455 to 630 nm, and 530 to 725 nm, respectively, and each stop band is in a different wavelength range. [5] The optical member according to any one of [1] to [4], wherein the absorber having an absorption maximum in a wavelength range of 380 to 725 nm is any one of azomethine compounds, azopyridone compounds, pyrazolone azo compounds, indole compounds, anthraquinone compounds, coumarin compounds, dipyrromethene compounds, triarylmethane compounds, xanthene compounds, polymethine compounds, merocyanine compounds, benzylidene compounds, cyanine compounds, squarylium compounds, croconium compounds, perylene compounds, dioxazine compounds, phthalocyanine compounds, porphyrin compounds, tetraazaporphyrin compounds, subphthalocyanine compounds, and metal chelate compounds thereof. [6] An optical member according to any one of [1] to [5], wherein any one of the absorbents having an absorption maximum in the wavelength range of 380 to 725 nm is an absorbent (a) having an absorption maximum in the wavelength range of 380 to 530 nm, an absorbent (b) having an absorption maximum in the wavelength range of 455 to 630 nm, or an absorbent (c) having an absorption maximum in the wavelength range of 530 to 725 nm. [7] An optical element according to any one of [1] to [6], having a maximum transmittance of 30% or less at wavelengths of 725 to 1000 nm. [8] The optical member according to any one of [1] to [7], wherein the resin comprises at least one transparent resin selected from the group consisting of cyclic (poly)olefin-based resins, aromatic polyether-based resins, polyimide-based resins, fluorene polycarbonate-based resins, fluorene polyester-based resins, polycarbonate-based resins, polyamide (aramid)-based resins, polyarylate-based resins, polysulfone-based resins, polyethersulfone-based resins, polyparaphenylene-based resins, polyamide imide-based resins, polyethylene naphthalate (PEN)-based resins, fluorinated aromatic polymer-based resins, (modified) acrylic-based resins, and epoxy-based resins. [9] The optical member according to any one of [1] to [8], wherein the optical member is a substrate made of the absorbing layer, or a laminated substrate in which the absorbing layer and another layer not containing the absorbent are laminated.

[10] The optical member according to [9], wherein the other layer not containing an absorbent is made of a resin substrate or a glass substrate, and the absorbent layer is provided on at least one surface of the resin substrate or the glass substrate.

[11] An optical member according to any one of [1] to

[10] , having a dielectric multilayer film. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide an optical element that selectively transmits light of any different visible wavelengths and exhibits little change in spectral characteristics even when light is incident at an angle, i.e., has low incidence angle dependency. The present invention also exhibits the effects of higher selectivity of light obtained through the transmission band and less noise. [Brief explanation of the drawings]

[0013] [Figure 1] Figure 1(a) is a schematic diagram showing a method for measuring the transmittance when measured from the perpendicular direction of the substrate (i) or optical filter, and Figure 1(b) is a schematic diagram showing a method for measuring the transmittance when measured from an angle of 45° to the perpendicular direction of the optical filter. [Figure 2] FIG. 2 shows the spectral transmission spectra of transmitted light when light is transmitted through the optical member obtained in Example 2 in the perpendicular direction, at an angle of (0°) and at an angle of 45° relative to the perpendicular direction. [Figure 3] FIG. 3 shows the spectral transmission spectra of light transmitted through the optical members obtained in Example 9 and Comparative Example 3 when light is transmitted in the perpendicular direction. [Figure 4] FIG. 4 shows the spectral transmission spectra of light transmitted through the optical members obtained in Examples 10 and 11 when light is transmitted in the perpendicular direction. [Figure 5] FIG. 5 shows the spectral transmission spectra of light transmitted through the optical members obtained in Examples 12 and 13 when light is transmitted in the perpendicular direction. [Figure 6] FIG. 6 shows the spectral transmission spectrum of light transmitted through the optical member obtained in Example 16 when light is transmitted in the vertical direction. [Figure 7] FIG. 7 shows the spectral transmission spectra of transmitted light when light is transmitted through the optical member obtained in Comparative Example 1 in the perpendicular direction, at an angle of (0°) and at an angle of 45° relative to the perpendicular direction. [Figure 8]FIG. 8 shows the spectral transmission spectrum of light transmitted through the optical member obtained in Comparative Example 2 in the perpendicular direction. [Figure 9-1] FIG. 9-1 shows a schematic diagram illustrating the concept of the present invention. [Figure 9-2] FIG. 9-2 shows a schematic diagram illustrating the concept of the present invention. [Figure 9-3] FIG. 9-3 shows a schematic diagram illustrating the concept of the present invention. [Figure 9-4] FIG. 9-4 shows a schematic diagram illustrating the concept of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention will be specifically described below. [Optical components] The optical member of the present invention is an optical member having at least one absorbing layer containing an absorbent having an absorption maximum in the wavelength range of 380 to 725 nm and a resin.

[0015] <Absorption layer> The absorption layer has at least three stop bands in the light wavelength range of 380 to 725 nm. Each stop band has a maximum transmittance of 15% or less, and each stop band refers to a wavelength range from the shortest wavelength at which the transmittance, measured from the perpendicular direction of the optical component, is greater than 15% to less than 15% to the longest wavelength at which the transmittance is less than 15% to 15% or more. In the present invention, the width of the stop band on the longest wavelength side is 50 nm or more. There are transmission bands between each stop band, and each transmission band has a minimum transmittance of 30% or more.

[0016] Each transmission band refers to a wavelength band from the shortest wavelength at which the transmittance, measured from the perpendicular direction of the optical element, is 30% or less to more than 30%, to the longest wavelength at which the transmittance is from more than 30% to 30% or less.

[0017] The optical element of the present invention having such an absorption layer has the characteristics of selectively transmitting light of any different visible wavelengths and exhibiting little change in spectral characteristics even when light rays are incident obliquely, i.e., low incidence angle dependency.

[0018] 9-1 to 9-4 are schematic diagrams of the present invention, which are conceptual diagrams in which the above-mentioned features are applied to the measurement results of the examples described later. The at least three stop bands are preferably in the ranges of 380 to 530 nm (referred to as Za), 455 to 630 nm (referred to as Zb), and 530 to 725 nm (referred to as Zc), respectively, and each stop band is preferably in a different wavelength range. When the stop bands are in these ranges, the selectivity of the light obtained through each transmission band is high and noise is reduced. For the 380 to 530 nm stop band, it is sufficient that a portion of the stop band falls within this range, and there is no particular problem even if it is below 380 nm. For the 530 to 725 nm stop band, it is sufficient that a portion of the stop band falls within this range, and there is no particular problem even if it exceeds 725 nm. Between Za and Zb is a transmission band Zd, and between Zb and Zc is a transmission band Ze. Each of the transmission bands is preferably in the range of 400 to 725 nm. When each transmission band is in the above range, the selectivity of the light obtained through each transmission band is high and noise is reduced.

[0019] As long as there is a stop band within the above range, the central transmission wavelength of the stop band is not particularly limited. The central transmission wavelength of the stop band refers to the intermediate wavelength between the wavelength at which the transmittance, when measured perpendicularly to the optical component, is greater than 15% but less than 15%, and the wavelength at which the transmittance is next less than 15% but less than 15%. If the shortest wavelength at which the transmittance is greater than 15% but less than 15% or the longest wavelength at which the transmittance is less than 15% but more than 15% is not observed due to the measurement limitations of the measuring device, the transmittance shall be calculated based on the lower or upper limit of the measured range. The lower limit of the stop band on the short wavelength side, i.e., the wavelength at which the stop band starts, is 300 nm, and the upper limit of the stop band on the long wavelength side, i.e., the wavelength at which the stop band ends, is 1100 nm.

[0020] If the stop band and transmission band are within these ranges, unwanted near-infrared light can be selectively and efficiently cut off, the S / N ratio of the near-infrared light for sensing can be improved, and the incidence angle dependency of the optical properties in the visible light wavelength to near-infrared light wavelength range can be further reduced.

[0021] The number of stop bands should be at least three, and may be four or more, as long as they are different wavelength ranges within this range. However, five or fewer stop bands are preferred because the optical selectivity tends to deteriorate as the number of stop bands increases. In particular, for applications such as sensing and imaging using the RGB three-primary color system, three or four stop bands are preferred, which allow for the use of any two or all of the RGB colors with good selectivity. Note that when there are four stop bands, it is sufficient for the four stop bands to be within the wavelength range described above. Furthermore, when there are four stop bands, the stop band on the longer wavelength side than Zc is sometimes called Zf, and the transmission band between Zc and Zf is sometimes called Zg.

[0022] In the present invention, when the transmittance is measured in the perpendicular direction, the width of the stop band on the longest wavelength side is 50 nm or more, preferably 100 nm or more, and particularly preferably 200 nm or more.

[0023] The width of the stop band on the longest wavelength side is the absolute value of the difference between the longest wavelength (γ1) where the maximum transmittance is 15% or less and the wavelength (γ2) longer than this where the maximum transmittance exceeds 15%, i.e., |γ1 - γ2|. If γ2 cannot be detected, the longest wavelength in the measured range is used as γ2. By configuring this value to be within a specified range, it is possible to cut out unnecessary light outside the target wavelength range, which is prone to color mixing, and achieve transmittance characteristics with a high S / N ratio. The upper limit of the stop band on the longest wavelength side, that is, the wavelength at the end of the stop band, is set to 1100 nm as described above. These are outlined in Figure 9-1, Schematic Diagram a.

[0024] The full width at half maximum (FWHM) of each transmission band is the maximum transmission wavelength (λ maxThe FWHM is obtained by calculating the absolute difference between the wavelengths on the shortest wavelength side and the longest wavelength side at which the transmittance is half of that of the other wavelengths. The FWHM of each transmission band is preferably less than 100 nm, and more preferably less than 70 nm. A narrow FWHM ensures high selectivity for the wavelength range of the target light. An outline of the FWHM is shown in Figure 9-2, Schematic diagram b.

[0025] The optical member of the present invention is characterized by low incidence angle dependency, which will be explained below. When light rays are incident at an angle, problems occur such as the visible light that is to be selectively transmitted having different colors in the center and periphery of the image, adversely affecting color reproducibility. In particular, in sensing devices and imaging devices, incident light can be incident from 0 degrees (0-degree incidence) to 45 degrees (45-degree incidence) from the perpendicular direction to the surface direction, so it is desirable for the dependency on the incident angle to be low in these angle ranges. The change width (Δλ) of the maximum transmittance wavelength of each transmission band between 0-degree incidence and 45-degree incidence is shown in the schematic diagram c of Figure 9-3, and is expressed as the maximum transmission wavelength (λ0) at which the maximum transmittance is achieved at 0 degrees incidence for each transmission band, and the maximum transmission wavelength (λ 45 ) and Δλ is preferably 5 nm or less, more preferably 3 nm or less.

[0026] In the optical element of the present invention, when the integrated value of the transmittance in the transmission band on the longest wavelength side is S, the integrated value S0 at 0-degree incidence and the integrated value S at 45-degree incidence are 45 The ratio P value (P=S 45 / S0) is preferably 1 / 3 or more, and more preferably 2 / 3 or more.

[0027] By satisfying these conditions, for example, in applications such as fingerprint, iris, and face sensing, information on the outer edges can be obtained with good color reproducibility, making it less likely to cause problems such as false detection.The integrated value of the transmittance of the transmission band is the integrated value of the transmittance between the shortest and longest transmission wavelengths in the transmission band, as shown in schematic diagram d of Figure 9-4.

[0028] The optical element of the present invention selectively transmits light of any different visible wavelength in the wavelength range of 380 to 725 nm, and the change in the maximum transmittance wavelength in each transmission band between 0-degree incidence and 45-degree incidence is small, so that the optical element has low dependency on the angle of incidence, and when used in applications such as sensing and imaging, it can achieve good image quality and color reproducibility at the image edge.Furthermore, when the optical element is used in applications such as a camera module with a sensing function, it can simultaneously achieve a good S / N ratio and image quality even when light is incident on the optical element at an oblique angle.

[0029] Moreover, in the present invention, these optical properties are achieved by providing an absorbing layer containing an absorbent having an absorption maximum in a predetermined wavelength range of 380 to 725 nm.

[0030] These optical properties can be achieved by providing a dielectric multilayer film in part, but it is more preferable to achieve them by using an absorber. In particular, the stop band on the longest wavelength side is preferably achieved solely by the absorbent contained in the absorption layer. The absorbent contained in the absorption layer preferably allows the width of the stop band on the longest wavelength side to be 50 nm or more, more preferably 100 nm or more, and particularly preferably 200 nm or more. By forming the stop band on the longest wavelength side over a wide wavelength range using the absorbent, the P value can be brought closer to 1. By achieving this using only the absorbent in this way, the incidence angle dependency can be particularly reduced, and an optical element with good color reproducibility can be obtained.

[0031] Furthermore, in the present invention, the maximum transmittance in the wavelength range of 725 to 1000 nm is preferably 30% or less, and more preferably 15% or less. By cutting off light in this wavelength range, color reproducibility can be improved. While this optical property can be achieved by providing a dielectric multilayer film, it is particularly preferable to achieve it using only an absorber.

[0032] The maximum transmittance in each transmission band is 30% or more, preferably 35% or more, and more preferably 40% or more. The minimum transmittance in each transmission band is 15% or less, and more preferably 10% or less. When the maximum transmittance in the transmission band and the minimum transmittance in the stop band are within the above ranges, an optical element can be obtained that achieves high sensing performance, has little noise, and has excellent color reproducibility.

[0033] The thickness of the optical member of the present invention may be appropriately selected depending on the desired application, but since a thinner and lighter optical member is more suitable for carrying around or moving an imaging device or the like, it is preferable that the optical member of the present invention is thin. The optical member of the present invention can be made thin.

[0034] The thickness of the optical member of the present invention can be appropriately selected depending on the desired application and is not particularly limited, but is, for example, preferably 1100 μm or less, more preferably 500 μm or less, even more preferably 1 to 250 μm, and particularly preferably 3 to 150 μm. If the thickness is within the above range, the optical member can be made thin and lightweight without cracks or the like.

[0035] (Configuration of optical components) The optical member according to the present invention is not particularly limited in its configuration, as long as it has at least one absorbing layer containing an absorbent having an absorption maximum in the wavelength range of 380 to 725 nm and a resin.

[0036] The optical component may be a substrate (referred to as substrate (i)) comprising an absorbing layer containing an absorbent, or a laminated substrate (substrate (ii)) in which the absorbing layer and another layer not containing an absorbent are laminated. A laminated substrate in which another absorbing layer is further formed on the substrate (i) is also included in the embodiments of the present invention.

[0037] Examples of the substrate (ii) include a substrate in which an absorbing layer is laminated on glass, a substrate in which a resin layer, such as an overcoat layer made of a curable resin that does not contain an absorbent, is laminated on an absorbing layer, etc. By laminating another resin layer that does not contain an absorbent, scratches on the substrate can be removed and the scratch resistance of the optical component can be improved.

[0038] Hereinafter, a substrate containing an absorbent and a resin will also be referred to as an "absorbent layer," and a layer made of a resin without containing an absorbent will also be simply referred to as a "resin layer." The base material for the substrate is not particularly limited in either the case of substrate (i) or (ii) above, but a material that provides a total light transmittance (JIS K7375) of the substrate of preferably 75% or more, more preferably 78% or more, and particularly preferably 80% or more can be used. If a material within this range is used, the resulting substrate will exhibit good transparency as an optical film. Examples of such materials include organic materials such as resins and inorganic materials such as glass and crystalline materials. Furthermore, substrates made entirely of resin are particularly preferred because they are lightweight and shatter-resistant. If a material falling within this range is used, the resulting substrate will exhibit good transparency as an optical film.

[0039] <Absorbent> In the present invention, the absorbing layer contains an absorber (hereinafter referred to as absorber (A)) that has an absorption maximum in the wavelength range of 380 to 725 nm. The absorber (A) is preferably a solvent-soluble dye compound. The absorption maximum wavelength of the absorber in this specification is measured by dissolving the compound in dichloromethane and then measuring the resulting solution using a spectrophotometer.

[0040] The absorbent (A) is not particularly limited as long as it has an absorption maximum wavelength in the range of 380 nm to 725 nm, and may be either an inorganic compound or an organic compound. For example, compounds containing various known substances used as dyes or pigments can be used. Examples of these compounds include at least one selected from azo compounds, azomethine compounds, azopyridone compounds, pyrazolone azo compounds, indole compounds, anthraquinone compounds, quinophthalone compounds, coumarin compounds, dipyrromethene compounds, pyrrolopyrrole compounds, diketopyrrolopyrrole compounds, diphenylmethane compounds, triarylmethane compounds, xanthene compounds, acridine compounds, polymethine compounds, xonol compounds, merocyanine compounds, arylidene compounds, benzylidene compounds, cyanine compounds, squarylium compounds, croconium compounds, perylene compounds, dioxazine compounds, phthalocyanine compounds, porphyrin compounds, tetraazaporphyrin compounds, subphthalocyanine compounds, and metal chelate compounds thereof. The polymethine compounds are polymethine compounds excluding oxonol compounds, merocyanine compounds, arylidene compounds, benzylidene compounds, cyanine compounds, squarylium compounds, and croconium compounds, and the phthalocyanine compounds are phthalocyanine compounds excluding porphyrin compounds and tetraazaporphyrin compounds.

[0041] Among these, at least one selected from azomethine compounds, azopyridone compounds, pyrazolone azo compounds, indole compounds, anthraquinone compounds, coumarin compounds, dipyrromethene compounds, triarylmethane compounds, xanthene compounds, polymethine compounds, merocyanine compounds, benzylidene compounds, cyanine compounds, squarylium compounds, croconium compounds, perylene compounds, dioxazine compounds, phthalocyanine compounds, porphyrin compounds, tetraazaporphyrin compounds, subphthalocyanine compounds, and metal chelate compounds thereof is preferred; More preferred is at least one selected from azomethine compounds, azopyridone compounds, pyrazolone azo compounds, indole compounds, coumarin compounds, dipyrromethene compounds, triarylmethane compounds, xanthene compounds, polymethine compounds, merocyanine compounds, cyanine compounds, squarylium compounds, croconium compounds, phthalocyanine compounds, porphyrin compounds, tetraazaporphyrin compounds, subphthalocyanine compounds, and metal chelate compounds thereof.

[0042] Specific structures of absorbents are described in, for example, "New Edition Dye Handbook" (edited by the Society of Organic Synthetic Chemistry; Maruzen, 1970) and "Dye Handbook" (edited by Okawara et al.; Kodansha, 1986).

[0043] The content of the absorbent (A) is preferably 0.0001 to 5.0 parts by mass, more preferably 0.001 to 3.0 parts by mass, and particularly preferably 0.001 to 1.0 part by mass, relative to 100 parts by mass of the resin contained in the absorbing layer. When the content of the absorbent (A) is within the above range, an optical member having both good visible light transmission properties and good incidence angle dependency can be obtained.

[0044] In the present invention, it is preferable to further contain an absorbent (B) different from absorbent (A) and having an absorption maximum in the wavelength range of 380 to 725 nm. Furthermore, it is even more preferable to contain an absorbent (C) different from absorbents (A) and (B) and having an absorption maximum in the wavelength range of 380 to 725 nm. Examples of absorbent (B) or (C) include compounds similar to absorbent (A). As long as absorbents (A) to (C) are different compounds, they can also be selected from compounds of the same type. By including such absorbent (B) or (C), an optical element can be obtained that exhibits both better visible light transmittance and better incident angle dependency.

[0045] The content of absorbent (B) or (C) is preferably 0.0001 to 5.0 parts by mass, more preferably 0.001 to 3.0 parts by mass, and particularly preferably 0.001 to 1.0 part by mass, relative to 100 parts by mass of the resin contained in the absorbing layer. When the content of absorbent (B) or (C) is within the above range, an optical element can be obtained that exhibits both better visible light transmission properties and better incidence angle dependency.

[0046] It is preferable that any one of absorbent (A), absorbent (B), and absorbent (C) is absorbent (a) having an absorption maximum in the wavelength range of 380 to 530 nm, absorbent (b) having an absorption maximum in the wavelength range of 455 to 630 nm, or absorbent (c) having an absorption maximum in the wavelength range of 530 to 725 nm. By combining absorbents with such absorption characteristics, it is possible to obtain an optical part that has the function of selectively transmitting light of any different visible wavelengths and has low incidence angle dependency.

[0047] Furthermore, in the present invention, the maximum transmittance at wavelengths of 725 to 1000 nm is preferably 30% or less, and more preferably 15% or less. By reducing the transmitted light in the wavelength range of 725 to 1000 nm, the width of the stop band on the longest wavelength side can be expanded, thereby reducing color mixing with light of wavelengths other than the target. For this purpose, it is desirable to incorporate the following absorbent (D) into the absorbing layer.

[0048] The absorbent (D) is not particularly limited as long as it is a compound that can absorb at least a portion of transmitted light in the wavelength range of 725 to 1000 nm, but for example, it may be a compound that has an absorption maximum in the wavelength range of 700 to 1100 nm, and specifically includes pyrrolopyrrole compounds, cyanine compounds, squarylium compounds, quaterylene compounds, croconium compounds, polymethine compounds, oxonol compounds, merocyanine compounds, cyanine compounds, squarylium compounds, croconium compounds, diimonium compounds, dithiol compounds, triarylmethane compounds, pyrromethene compounds, azomethine compounds, and anthraquinone compounds. Among these, it is preferable to include any one of pyrrolopyrrole compounds, polymethine compounds, cyanine compounds, squarylium compounds, quaterylene compounds, and diimonium compounds, and it is more preferable to include any one of polymethine compounds, cyanine compounds, squarylium compounds, and diimonium compounds. The absorbent (D) can be selected from compounds of the same type as the absorbents (A) to (C).

[0049] The content of the absorbent (D) is preferably 0.001 to 10.0 parts by mass, more preferably 0.01 to 5.0 parts by mass, and particularly preferably 0.05 to 1.0 part by mass, relative to 100 parts by mass of the resin contained in the absorbing layer. When the content of the absorbent (D) is within the above range, an optical filter can be obtained that satisfies all of good near-infrared absorption and transmission properties, high visible light transmittance, and the desired wavelength light selectivity.

[0050] <Other absorbents (E)> The absorbent layer may further contain another absorbent (E) that does not fall under the category of the absorbents (A) to (D).

[0051] The other absorbent (E) is not particularly limited as long as it is a compound other than the absorbents (A) to (D) and has an absorption maximum wavelength of 300 to 1200 nm. Examples of the other absorbent (E) include azo compounds, azomethine compounds, azopyridone compounds, pyrazolone azo compounds, indole compounds, anthraquinone compounds, quinophthalone compounds, coumarin compounds, dipyrromethene compounds, pyrrolopyrrole compounds, diketopyrrolopyrrole compounds, diphenylmethane compounds, triarylmethane compounds, xanthene compounds, acridine compounds, poly Examples of absorbents include at least one absorbent selected from the group consisting of methine compounds, oxonol compounds, merocyanine compounds, arylidene compounds, benzylidene compounds, cyanine compounds, squarylium compounds, quaterylene compounds, croconium compounds, perylene compounds, dioxazine compounds, phthalocyanine compounds, porphyrin compounds, tetraazaporphyrin compounds, subphthalocyanine compounds, diimonium compounds, dithiol compounds, and metal chelate compounds thereof. Depending on the absorption characteristics of the absorbents (A) to (D) and the target transmission wavelength, the absorbents (A) to (D) can be used in combination with another absorbent (E) to extract only the desired wavelength range with high selectivity, thereby achieving good sensing performance.

[0052] The content of the other absorbent (E) is preferably 0.0001 to 5.0 parts by mass, more preferably 0.001 to 3.0 parts by mass, and particularly preferably 0.001 to 1.0 part by mass, relative to 100 parts by weight of the resin contained in the absorbing layer. When the content of the absorbent (E) is within the above range, the selectivity of the extracted wavelength can be further improved.

[0053] <Combination> In the present invention, a combination of a plurality of absorbents (A) to (C) is used, and the combination is not particularly limited. Of these, the following combinations are preferred in terms of achieving both heat resistance and steep absorption characteristics. (1) Combination of an indole compound and a squarylium compound (2) An embodiment including an indole compound, a squarylium compound, and a polymethine compound (3) An embodiment including an indole compound, a squarylium compound, a polymethine compound, and an azopyridone compound (4) An embodiment including an indole compound, a squarylium compound, a polymethine compound, an azopyridone compound, and a cyanine compound In addition, the composition may contain an absorbent (D) in combination with the above. In particular, by using an absorbent (D) selected from polymethine compounds, cyanine compounds, and diimonium compounds in combination, it is possible to cut a wide range of unnecessary near-infrared light while maintaining heat resistance. When multiple absorbents are used, they may all be contained in a single absorbent layer, or multiple absorbent layers may each contain an absorbent. For example, absorbent (A) and absorbents (B), (C), (D), etc. may all be contained in the same absorbent layer, or an absorbent layer containing absorbent (A) may be laminated with an absorbent layer containing absorbents (B), (C), (D), etc. It is easier to control the content ratio when all absorbents are contained in the same absorbent layer. Note that when multiple absorbent layers are provided, the above parts by mass are based on the mass of each layer.

[0054] <Resin> The resin is not particularly limited as long as it does not impair the effects of the present invention, but examples thereof include resins having a glass transition temperature (Tg) of preferably 110 to 380° C., more preferably 130 to 360° C., in order to ensure thermal stability and formability into a film and to provide a substrate on which a dielectric multilayer film can be formed by high-temperature vapor deposition at a vapor deposition temperature of 100° C. or higher. Furthermore, if the glass transition temperature of the resin is 140° C. or higher, it becomes possible to vapor-deposit a dielectric multilayer film at a higher temperature, for example.

[0055] When a solvent-soluble resin is used as the resin, the weight average molecular weight (Mw) of the transparent resin measured by gel permeation chromatography (GPC) in terms of polystyrene is usually 15,000 to 350,000, preferably 30,000 to 250,000, and the number average molecular weight (Mn) is usually 10,000 to 150,000, preferably 20,000 to 100,000.

[0056] In the substrate (i), these resins constitute an absorbing layer together with the absorbent, but in the case of the laminated substrate (ii), they may be contained as constituent materials of a layer that does not contain an absorbent. The resin preferably includes at least one transparent resin selected from the group consisting of cyclic (poly)olefin resins, aromatic polyether resins, polyimide resins, fluorene polycarbonate resins, fluorene polyester resins, polycarbonate resins, polyamide (aramid) resins, polyarylate resins, polysulfone resins, polyethersulfone resins, polyparaphenylene resins, polyamideimide resins, polyethylene naphthalate (PEN) resins, fluorinated aromatic polymer resins, (modified) acrylic resins, and epoxy resins. Furthermore, from the viewpoints of transparency and heat resistance, cyclic (poly)olefin resins and polycarbonate resins are particularly preferred.

[0057] The resin may be commercially available products such as those listed below. Commercially available cyclic (poly)olefin resins include, for example, ARTON manufactured by JSR Corporation, ZEONOR manufactured by Nippon Zeon Co., Ltd., APEL manufactured by Mitsui Chemicals, Inc., and TOPAS manufactured by Polyplastics Co., Ltd. Commercially available polyimide resins include, for example, Neoprim L, C3450, and C3630 manufactured by Mitsubishi Gas Chemical Company, Inc. Commercially available fluorene polyester resins include, for example, OKP4HT and OKP850 manufactured by Osaka Gas Chemicals Co., Ltd. Commercially available polycarbonate resins include, for example, Panlite K-1300Y and SP3810 manufactured by Teijin Limited, and Iupizeta (registered trademark) PCZ-500, FPC-0220, and EP5000 manufactured by Mitsubishi Gas Chemical Company, Inc. Commercially available polyarylate resins include, for example, U-100 manufactured by Unitika Ltd. Commercially available polyethersulfone resins include, for example, Sumikaexcel PES4800 manufactured by Sumitomo Chemical Co., Ltd. Commercially available (modified) acrylic resins include, for example, Acriview manufactured by Nippon Shokubai Co., Ltd. and Ogusol EA-F5003 manufactured by Osaka Gas Chemicals Co., Ltd.

[0058] <Other layers that do not contain absorbent material> The optical element of the present invention is a substrate (i) comprising an absorbing layer comprising an absorbent and a resin, or a laminated substrate (ii) comprising the absorbing layer and another layer not containing an absorbent. The other layer not containing an absorbent is made of a resin or glass material, and a resin substrate or a glass substrate is usually preferably used. In the present invention, it is preferable that an absorbing layer is provided on at least one surface of the resin substrate or the glass substrate.

[0059] Examples of resins constituting the resin substrate include the resin materials described above. Glass materials constituting the glass substrate are not particularly limited as long as they do not impair the effects of the present invention, and include silicate glasses such as soda-lime glass and white plate glass, borosilicate glass, alkali-free glass, quartz glass, fluorophosphate glass, and phosphate glass. Phosphate glass also includes silicophosphate glass in which part of the glass skeleton is composed of SiO2. It also includes absorption-type glass (near-infrared absorbing glass substrate) in which CuO or the like is added to fluorophosphate glass or phosphate glass.

[0060] Examples of commercially available glasses include AN100, NF-50, NF-50E, NF-50EX, NF-50T, NF-50TX, SW-3, SW-Y, SW-YY, EN-A1, FP1, and FP01eco manufactured by AGC Inc.; AF33, Tempax (registered trademark) series, BG-60, BG-61, D263 T eco, and D270 manufactured by SCHOTT AG; CXD700, CD700, CD5000, C5000, and HA5 manufactured by HOYA Corporation; 500EXL, BDA, BDA-E, ABC-G, and OA-10G manufactured by Nippon Electric Glass Co., Ltd.; and BS-7 and BS-11 manufactured by Matsunami Glass Industry Co., Ltd.

[0061] In the optical member of the present invention, an adhesive layer may be provided on the resin substrate or glass substrate as needed to enhance adhesion to the absorbing layer. The adhesive layer may be formed from an adhesive or pressure-sensitive adhesive, and preferably has a refractive index close to that of the substrate and the absorbing layer. There are no particular limitations on the method for adjusting the refractive index of the adhesive layer, and the method described in JP-A-11-223712 can be used, for example.

[0062] Examples of compositions constituting the adhesive layer include acrylate-based compositions, urethane-based compositions, epoxy-based compositions, polyester-based compositions, silicone-based compositions, polyolefin-based compositions, modified polyolefin-based compositions, ethylene vinyl alcohol-based compositions, vinyl chloride-based compositions, chloroprene rubber-based compositions, cyanoacrylate-based compositions, polyamide-based compositions, polyimide-based compositions, polystyrene-based compositions, and polyvinyl butyral-based compositions. These may be used alone or in combination of two or more. Among these, acrylate-based compositions are particularly preferred because of their excellent reliability in terms of water resistance, heat resistance, light resistance, etc., as well as their good adhesive strength and transparency.

[0063] The adhesive layer may be of a hot melt type, a heat-curing type, a light-curing type, a reaction-curing type, or a pressure-sensitive adhesive type that does not require curing, depending on the curing method. However, the heat-curing type is particularly preferred because it is easy to operate and handle.

[0064] The method for laminating the adhesive layer is not particularly limited, but examples include a method in which the adhesive layer is applied by a spray method, a roll coating method, a rotary coating method (spin coating method), a slit die coating method (slit coating method), a bar coating method, etc., and then cured by heating, ultraviolet irradiation, pressure, etc.

[0065] In the optical member of the present invention, a functional film such as an overcoat layer, a hard coat film, an antireflection film, an antistatic film, an adhesion aid film, a stress adjustment film, or a conductive film may be appropriately provided on the surface of the absorbing layer as another layer not containing an absorbent, for the purpose of improving surface hardness, improving chemical resistance, preventing static electricity, and eliminating scratches.

[0066] The optical member of the present invention may include one layer made of the functional film, or may include two or more layers. When the optical member of the present invention includes two or more layers made of the functional film, the layers may be two or more of the same layer, or two or more of different layers.

[0067] The thickness of the functional film is preferably 0.1 to 20 μm, more preferably 0.5 to 10 μm, and particularly preferably 0.7 to 5 μm. Furthermore, in order to improve the adhesion between the substrate and the functional film, the surface of the substrate or the functional film may be subjected to a surface treatment such as a corona treatment or a plasma treatment.

[0068] <Other ingredients> The optical component may contain additives such as antioxidants, near-ultraviolet absorbers other than absorbers (A) to (C), adhesion promoters, fluorescence quenchers, and metal complex compounds, as long as the additives do not impair the effects of the present invention. These additives may be contained in the absorbing layer or in other layers that do not contain absorbers. Furthermore, when manufacturing the optical component by cast molding or the like, a leveling agent or an antifoaming agent may be added to facilitate the manufacturing of the component. These other components may be used alone or in combination of two or more.

[0069] Examples of the antioxidant include phenolic compounds (such as hindered phenolic compounds), (phosphite) compounds (such as phosphite ester compounds), thioether compounds, etc. Examples of the phenolic compounds include 2,6-di-t-butyl-4-methylphenol, 2,2'-dioxy-3,3'-di-t-butyl-5,5'-dimethyldiphenylmethane, and tetrakis[methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate]methane. Examples of phosphorus compounds include tris[2-[[2,4,8,10-tetrakis(1,1-dimethylethyl)dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl]oxy]ethyl]amine, tris[2-[(4,6,9,11-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin-2-yl)oxy]ethyl]amine, and ethylbis(2,4-di-tert-butyl-6-methylphenyl)phosphite.

[0070] Examples of commercially available antioxidants include the Adeka Stab series manufactured by ADEKA CORPORATION, the IRGANOX series manufactured by BASF SE, and the Sumilizer series manufactured by Sumitomo Chemical Co., Ltd.

[0071] The near-ultraviolet absorber can be any known compound capable of absorbing ultraviolet light, such as an azomethine compound, an indole compound, a benzotriazole compound, or a triazine compound. Among these ultraviolet absorbers, benzotriazole or hydroxyphenyltriazine ultraviolet absorbers are preferred for achieving ultraviolet light absorption (ultraviolet light blocking). Furthermore, to broaden the ultraviolet light absorption bandwidth, two or more ultraviolet absorbers with different maximum absorption wavelengths can be used in combination. Commercially available products include Tinuvin 400, Tinuvin 405, Tinuvin 460, Tinuvin 477, Tinuvin 479, and Tinuvin 1577 manufactured by BASF SE.

[0072] Examples of the adhesion promoter include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, etc. By including an adhesion promoter, the adhesion between layers can be improved.

[0073] These additives may be mixed with the absorbent and resin when producing the substrate (i) or (ii), or may be added when synthesizing the resin. The amount added is selected appropriately depending on the desired properties, but is usually 0.01 to 5.0 parts by mass, and preferably 0.01 to 2.0 parts by mass, per 100 parts by mass of the resin.

[0074] <Method of manufacturing optical members> When the optical member is a substrate (i) comprising an absorbing layer containing the absorbent and a resin, etc., The substrate (i) is, for example, A method of mixing an absorbent, a resin, and other components used as needed, and then coating the resulting resin composition on a suitable support and removing the solvent; or When the resin is a photocurable resin and / or a thermosetting resin, the curable resin composition is coated on a suitable support and then cured by an appropriate method such as ultraviolet irradiation or heating. It can be produced by

[0075] When a solvent is contained, the optical member may be molded and then dried to remove the solvent. When melt molding is performed, pellets may be prepared and then molded into a predetermined shape. Specific examples of the melt molding method include injection molding, melt extrusion blow molding, and cast molding.

[0076] When the absorbent layer is made up of a plurality of layers, the absorbent layers may be laminated by repeating the same molding process. When the optical member is a laminated substrate (ii) in which an absorbing layer is laminated on at least one surface of a transparent substrate such as a glass substrate or a resin substrate, for example, the laminated substrate (ii) can be produced by applying a resin composition containing an absorbent to the surface of the glass substrate or the resin substrate by melt molding or cast molding, or by a spray method, an inkjet method, a roll coating method, a rotary coating method (spin coating method), a slit die coating method (slit coating method), a bar coating method, or the like, and then performing a curing treatment by heat, ultraviolet irradiation, or the like to form an absorbing layer.

[0077] The substrate (i) or (ii) may optionally have an adhesive layer formed on the transparent substrate to enhance adhesion to the absorbing layer. The solvent used in producing the substrate (i) or (ii) is not particularly limited as long as it dissolves the resin, but volatile solvents are preferred. Furthermore, antioxidants, near-ultraviolet absorbers, adhesion promoters, fluorescence quenchers, leveling agents, antifoaming agents, metal complex compounds, and the like may be added. These additives may be used alone or in combination of two or more.

[0078] The amount of residual solvent in the absorbent layer obtained by the above method should be as small as possible. Specifically, the amount of residual solvent is preferably 3% by weight or less, more preferably 1% by weight or less, and even more preferably 0.5% by weight or less, based on the weight of the absorbent layer. When the amount of residual solvent is within the above range, an absorbent layer that is resistant to deformation and changes in properties and can easily exhibit the desired functions can be obtained.

[0079] [Dielectric multilayer film] The optical element of the present invention may be provided with a dielectric multilayer film. The dielectric multilayer film is a film that can adjust the spectral characteristics by cutting out light of unnecessary wavelengths through interference while transmitting necessary light. In the present invention, the dielectric multilayer film may be provided on one side or both sides of the substrate. When provided on one side, the manufacturing cost and ease of manufacturing are excellent, and when provided on both sides, an optical element having high strength and being less prone to warping can be obtained. In the present invention, the dielectric multilayer film is preferably an anti-reflection film, since it can ensure light selectivity while maintaining low dependency on the incident angle.

[0080] Since it is preferable that the warpage of the optical component of the present invention is small, it is preferable that a dielectric multilayer film is provided on both sides of the substrate (i) and the laminated substrate (ii), and the layer structures of the dielectric multilayer films provided on both sides may be the same or different.

[0081] The dielectric multilayer film may be one in which high-refractive index material layers and low-refractive index material layers are alternately laminated. The high-refractive index material layers may be made of a material having a refractive index of 1.7 or higher, and a material having a refractive index of 1.7 to 2.5 is usually selected. Examples of such materials include those containing titanium oxide, zirconium oxide, tantalum pentoxide, niobium pentoxide, lanthanum oxide, yttrium oxide, zinc oxide, zinc sulfide, or indium oxide as the main component, with small amounts (e.g., 0 to 10 wt % of the main component) of titanium oxide, tin oxide, and / or cerium oxide.

[0082] The low refractive index material layer may be made of a material having a refractive index of 1.6 or less, and typically has a refractive index of 1.2 to 1.6, such as silica, alumina, lanthanum fluoride, magnesium fluoride, and sodium aluminum hexafluoride.

[0083] The method for laminating the high-refractive index material layers and the low-refractive index material layers is not particularly limited as long as a dielectric multilayer film is formed by laminating these material layers. For example, a dielectric multilayer film in which high-refractive index material layers and low-refractive index material layers are alternately laminated can be formed directly on a substrate by a CVD method, an atomic layer deposition method, a sputtering method, a vacuum deposition method, an ion-assisted deposition method, an ion plating method, or the like.

[0084] The physical film thickness of each of the high refractive index material layer and the low refractive index material layer varies depending on the refractive index of each layer, but is usually preferably 5 to 300 nm, and the total physical film thickness of the dielectric multilayer film is preferably 0.5 to 8.0 μm for the entire optical component.

[0085] The total number of layers of high refractive index material and low refractive index material in the dielectric multilayer film is preferably 10 to 70 layers in the entire optical component, and more preferably 10 to 50. When the thickness of each layer, the thickness of the dielectric multilayer film as the entire optical component, and the total number of layers are within the above ranges, sufficient manufacturing margins can be ensured, and warping of the optical component and cracks in the dielectric multilayer film can be reduced.

[0086] In the present invention, by appropriately selecting the types of materials constituting the high refractive index material layer and the low refractive index material layer, the thickness of each of the high refractive index material layer and the low refractive index material layer, the order of lamination, and the number of laminations, it is possible to obtain an optical member having a light blocking band and a light transmitting band of a desired visible light wavelength.

[0087] [Other functional membranes] Furthermore, in the optical element of the present invention, a functional film such as a hard coat film or an antistatic film may be appropriately provided on the dielectric multilayer film, in the same manner as other layers not containing the absorbent, for the purpose of improving the surface hardness of the substrate or the dielectric multilayer film, improving chemical resistance, preventing static electricity, and erasing scratches, as long as the effect of the present invention is not impaired.

[0088] [Optical component applications] The optical member of the present invention can selectively extract any different visible light wavelength and has low incidence angle dependency. Therefore, it is useful for application to solid-state imaging devices with sensing or camera functions, such as CCD and CMOS image sensors. It is particularly useful in iris authentication systems, face authentication systems, fingerprint authentication systems, pulse oximeters, digital still cameras, smartphone cameras, mobile phone cameras, digital video cameras, wearable device cameras, PC cameras, surveillance cameras, automotive cameras, night vision cameras, motion capture, laser rangefinders, virtual try-on, license plate recognition devices, televisions, car navigation systems, liquid crystal projectors, personal digital assistants, video game consoles, portable game consoles, digital music players, and the like. [Example]

[0089] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. In the following, "parts" means "parts by mass" unless otherwise specified. Furthermore, the methods for measuring and evaluating each physical property value are as follows.

[0090] <Molecular weight> The molecular weight of the compound was measured using a mass spectrometer (ACQUITY UPLC and SYNAPT HDMS) manufactured by Nihon Waters K.K.

[0091] <Spectral transmittance> The transmittance of the optical component in each wavelength region was measured in the range of 300 to 1100 nm using a spectrophotometer (U-4100) manufactured by Hitachi High-Technologies Corp. Therefore, when the wavelengths that are the thresholds of the stop band or transmission band are outside the measurement range, each optical property is calculated using 300 nm or 1100 nm as the threshold, and is described as being less than or greater than that.

[0092] Here, the transmittance measured from the perpendicular direction of the optical component was measured using light transmitted perpendicular to the optical component (AOI=0°) as shown in Figure 1(a).The transmittance measured from an angle of 45° to the perpendicular direction of the optical component (AOI=45°) was measured using light transmitted at an angle of 45° to the perpendicular direction of the optical component as shown in Figure 1(b).

[0093] The width of the stop band on the longest wavelength side is calculated as the width of the region where the transmittance is below 15% within the measurement range. If the next wavelength where the transmittance exceeds 15% is longer than 1100 nm, the width up to 1100 nm is calculated and stated as "more than that."

[0094] The full width at half maximum (FWHM) of each transmission band is calculated as the width of the region showing a transmittance equal to or greater than half the maximum transmittance of each transmission band.

[0095] The change width (Δλ) of the maximum transmission wavelength was calculated from the change width of the maximum transmission wavelength of each transmission band between 0° incidence and 45° incidence.

[0096] The rate of change (P) in the integrated value of the transmittance of the longest wavelength transmission band between 0-degree incidence and 45-degree incidence is calculated by multiplying the integrated value S0 of the transmittance between the shortest and longest transmission wavelengths in each transmission band at 0 degrees incidence and the integrated value S 45 Therefore, P=S 45When the P value was 5 / 6 or more, it was marked with a ◎, when it was 2 / 3 or more but less than 5 / 6, it was marked with a 〇, when it was 1 / 3 or more but less than 2 / 3, it was marked with a △, and when it was less than 1 / 3, it was marked with an ×.

[0097] A fingerprint authentication sensor device was created using the method described in WO2017-098758, and the optical members created in each Example and Comparative Example were placed on the light receiving element. The S / N ratio was determined from the sensing sensitivity characteristics of the resulting device under outdoor sunny daytime conditions (illuminance of approximately 100,000 lux) as follows. Good: Measurements were performed with a good S / N ratio, and there were no problems with fingerprint sensing sensitivity. ×: Frequent noise caused a deterioration in the S / N ratio, resulting in malfunction of fingerprint sensing.

[0098] [sample] Absorbent The absorbents (X-1) to (X-16) used in the following examples were either commercially available or synthesized by commonly known methods, such as those described in Dyes Pigm. 2014, 104, 160-168, Dyes Pigm. 2014, 105, 238-249, Justus Liebigs Annalen der Chemie 1966, 699, 153-167, Tetrahedron 2004, 60, 8913-8918, Khimiya Geterotsiklicheskikh Soedinenii 1992, 3, 339-344, Japanese Patent No. 6655449, and Japanese Patent No. 5941844.

[0099] <Compound synthesis example 1> As the squarylium compound absorbent (X-2), 2,4-bis(4-ethyl-3,5-dimethyl-1H-2-pyrrolyl)squaraine was synthesized with reference to the method described in Justus Liebigs Annalen der Chemie 1966, 699, 153-167. Molecular weight analysis: 324.19(M + : Calculated value 324.18) ​Maximum absorption wavelength in dichloromethane solution: 564 nm

[0100] <Compound synthesis example 2> As the squarylium compound absorbent (X-4), 2,4-bis(1-isopropyl-2,3,3-trimethyl-6-(2,2,3,3,3-pentafluoropropanamido)-5-indolinyl)squaraine was synthesized with reference to the method described in Japanese Patent No. 6655449. Molecular weight analysis: 806.28(M + : Calculated value 806.29) Maximum absorption wavelength in dichloromethane solution: 712 nm

[0101] <Compound synthesis example 3> The polymethine compound absorbent (X-5) was synthesized by obtaining 2-phenyl-4-((1E,3E)-5-((E)-2-phenyl-4H-chromen-4-ylidene)penta-1,3-dien-1-yl)chromenylium tetrakis(perfluorophenyl)borate as a perchlorate salt with reference to the method described in Khimiya Geterotsiklicheskikh Soedinenii 1982,9,1173-1177, followed by anion exchange. Molecular weight analysis: 477.18 (MB(C6F5)4: calculated value 477.18) Maximum absorption wavelength in dichloromethane solution: 830 nm

[0102] <Compound synthesis example 4> The polymethine compound absorbent (X-6) was synthesized by obtaining it as a perchlorate salt and then performing anion exchange with reference to the method described in Angew. Chem. Int. Ed. 2017, 56, 13126-13129, except that 7-(dimethylamino)-4-methyl-2-phenylchromenylium perchlorate was used instead of 2-(tert-butyl)-6-isopropyl-4-methylchromenylium perchlorate instead of 2-(tert-butyl)-4-((E)-2-((E)-3-(2-((E)-2-(tert-butyl)-6-isopropyl-4H-chromen-4-ylidene)ethylidene)-2-chlorocyclohex-1-en-1-yl)vinyl)-6-isopropylchromenylium tetrakis(perfluorophenyl)borate. 2-(tert-butyl)-6-isopropyl-4-methylchromenylium perchlorate was synthesized with reference to Khimiya Geterotsiklicheskikh Soedinenii 1992, 3, 339-344. Molecular weight analysis: 621.36 (MB(C6F5)4: calculated value 621.35) Maximum absorption wavelength in dichloromethane solution: 936 nm

[0103] <Compound synthesis example 5> The absorbent (X-7), a cyanine compound, was synthesized by obtaining 1-butyl-2-((E)-2-((E)-3-((E)-2-(1-butylbenzo{cd}indol-2(1H)-ylidene)ethylidene)-2-(diphenylamino)cyclopent-1-en-1-yl)vinyl)benzo{cd}indol-1-ium tetrakis(perfluorophenyl)borate as a perchlorate salt with reference to the method described in Japanese Patent No. 5941844, followed by anion exchange. Molecular weight analysis: 702.39 (MB(C6F5)4: calculated value 702.38) Maximum absorption wavelength in dichloromethane solution: 1023 nm

[0104] <Compound synthesis example 6> The polymethine compound absorbent (X-8) was synthesized by obtaining 2-(tert-butyl)-4-((1E,3E)-5-((E)-2-(tert-butyl)-4H-chromen-4-ylidene)penta-1,3-dien-1-yl)chromenylium tetrakis(perfluorophenyl)borate as a perchlorate salt with reference to the method described in Khimiya Geterotsiklicheskikh Soedinenii 1992,3,339-344, followed by anion exchange. Molecular weight analysis: 437.26 (MB(C6F5)4: calculated value 437.25) Maximum absorption wavelength in dichloromethane solution: 773 nm

[0105] <Compound synthesis example 7> As the absorbent (X-10), an azopyridone compound, (E)-1-ethyl-6-hydroxy-5-((4-methoxyphenyl)diazenyl)-4-methyl-2-oxo-1,2-dihydropyridine-3-carbonitrile was synthesized with reference to the method described in Dyes Pigm. 2014, 104, 160-168. Molecular weight analysis: 312.11(M + : Calculated value 312.12) Maximum absorption wavelength in dichloromethane solution: 389 nm

[0106] <Compound synthesis example 8> As the squarylium compound absorbent (X-11), 2,4-bis(4-(dibutylamino)-2-(2,2,2-trifluoroacetamido)phenyl)squaraine was synthesized with reference to the method described in Japanese Patent No. 6655449. Molecular weight analysis: 710.35(M + : Calculated value 710.33) Maximum absorption wavelength in dichloromethane solution: 687 nm

[0107] <Compound synthesis example 9> The cyanine compound absorbent (X-13) was synthesized by obtaining 2-((1E,3Z)-3-(3-butylbenzo{d}oxazol-2(3H)-ylidene)prop-1-en-1-yl)-1,3,3-trimethyl-3H-indol-1-ium tetrakis(perfluorophenyl)borate as a bromide salt with reference to the method described in Dyes Pigm. 2014, 105, 238-249, followed by anion exchange. Molecular weight analysis: 373.21 (MB(C6F5)4: calculated value 373.23) Maximum absorption wavelength in dichloromethane solution: 516 nm

[0108] <Compound synthesis example 10> As the squarylium compound absorbent (X-14), 2,4-bis(5-phenyl-1H-2-pyrrolyl)squaraine was synthesized with reference to the method described in Tetrahedron 2004, 60, 8913-8918. Molecular weight analysis: 364.12(M + : Calculated value 364.12) Maximum absorption wavelength in dichloromethane solution: 621 nm

[0109] <Compound synthesis example 11> The polymethine compound absorbent (X-16) was synthesized by obtaining the perchlorate salt and then performing anion exchange according to the method described in Japanese Patent No. 5941844, except that 1-butyl-2-methylbenzo[cd]indolium perchlorate was used instead of 2-(tert-butyl)-4-((E)-2-((E)-3-(2-((E)-2-(tert-butyl)-4H-chromen-4-ylidene)ethylidene)-2-(diphenylamino)cyclopent-1-en-1-yl)vinyl)chromenylium tetrakis(perfluorophenyl)borate. 2-(tert-butyl)-4-methylchromenylium perchlorate was synthesized with reference to Khimiya Geterotsiklicheskikh Soedinenii 1992,3,339-344. Molecular weight analysis: 656.37 (MB(C6F5)4: calculated value 656.35) Maximum absorption wavelength in dichloromethane solution: 870 nm

[0110] The indole-based compound BONASORB UA-3912 (manufactured by Orient Chemical Industries Co., Ltd.) was used as absorbent (X-1), NK-8861 (manufactured by Hayashibara Co., Ltd.) was used as absorbent (X-3), BONASORB UA-3911 (manufactured by Orient Chemical Industries Co., Ltd.) was used as absorbent (X-9), CIR-RL (manufactured by Nippon Carlit Co., Ltd.) was used as absorbent (X-12), and YRC-18 (manufactured by Yamada Chemical Industries Co., Ltd.) was used as absorbent (X-15).

[0111] Absorption maximum wavelength of absorbent (X-1) in dichloromethane solution: 384 nm Absorption maximum wavelength of absorbent (X-3) in dichloromethane solution: 596 nm Absorption maximum wavelength of absorbent (X-9) in dichloromethane solution: 392 nm Absorption maximum wavelength of absorbent (X-12) in dichloromethane solution: 1095 nm Absorption maximum wavelength of absorbent (X-15) in dichloromethane solution: 492 nm

[0112] [Example 1] A substrate comprising an absorbing layer containing an absorbent was prepared as an optical member in the following manner. A container was charged with 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.1] prepared according to Synthesis Example 1 of JP 2011-100084 A. 2,5 .1 7,1A cyclic polyolefin resin (resin (R-1), number average molecular weight (Mn): 32,000, weight average molecular weight (Mw): 137,000, glass transition temperature (Tg): 165 ° C.) consisting of a hydrogenated ring-opening polymer of 0-dodec-3-ene and 1-hexene (resin (R-1), number average molecular weight (Mn): 32,000, weight average molecular weight (Mw): 137,000, glass transition temperature (Tg): 165 ° C.) 100 parts, absorbent (X-1) 0.3 parts, absorbent (X-2) 0.08 parts, absorbent (X-3) 0.08 parts, absorbent (X-4) 0.001 parts, absorbent (X-5) 0.4 parts, absorbent (X-6) 0.25 parts, and absorbent (X-7) 0.12 parts (collectively referred to as absorbent (XA)), and dichloromethane were added to obtain a solution with a resin concentration of 20% by mass. The resulting solution was then cast onto a smooth glass plate, dried at 20 ° C. for 8 hours, and then peeled off from the glass plate. The peeled coating film was further dried at 100°C under reduced pressure for 8 hours to obtain a substrate consisting of an absorbing layer having a thickness of 100µm, a length of 60mm and a width of 60mm.

[0113] The optical properties of the obtained substrate as an optical component were evaluated. The central transmission wavelengths of the stop bands at AOI = 0° were 378 nm, 561 nm, and 885 nm, and the maximum transmission wavelengths of the transmission bands were 470 nm and 637 nm. In addition, the maximum transmittance in the wavelength range of 380 to 725 nm was 49.2%, and the minimum transmittance was <0.1%. The width of the stop band on the longest wavelength side was 378 nm, and the FWHM max The Δλ was 60 nm, which was extremely good. max The peak intensity was 0 nm and the P value was 76%, showing excellent dependence on the incident angle. Evaluation of the S / N ratio also showed that there was less noise. Table 7 also shows the central transmission wavelength of each stop band, the start and end wavelengths of the stop band, the maximum transmission wavelength of each transmission band, and the start and end wavelengths of the transmission band.

[0114] [Example 2] Resin composition (1), prepared by adding 60 parts of tricyclodecane dimethanol acrylate, 40 parts of dipentaerythritol hexaacrylate, 5 parts of 1-hydroxycyclohexyl phenyl ketone, and methyl ethyl ketone to adjust the resin concentration to 30% by mass, was applied to one side of the optical member obtained in Example 1 using a bar coater, and heated in an oven at 70°C for 2 minutes to volatilize and remove the solvent. At this time, the application conditions of the bar coater were adjusted so that the thickness after drying would be 2 μm. Next, the coating was exposed (exposure dose 500 mJ / cm2) using a conveyor-type exposure machine. 2 , 200 mW) to harden the resin and form a resin layer on the substrate. Similarly, a resin layer made of resin composition (1) was formed on the other side of the optical member, to obtain an optical member having a thickness of 104 μm, which had resin layers on both sides of the substrate made of an absorbing layer containing absorbent (XA).

[0115] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise. FIG. 2 shows the spectral transmission spectrum obtained by measuring the transmitted light when light is transmitted through the optical component perpendicularly (0°) and when light is transmitted at an angle of 45° to the perpendicular direction.

[0116] [Example 3] In Example 3, dielectric multilayer films (I) and (II) having the configurations shown in Table 1 were formed as antireflection films on the optical member obtained in Example 2, and an optical member with a thickness of 105 μm was obtained.

[0117] The dielectric multilayer film (I) is made by alternately laminating silica (SiO2: refractive index 1.46 at 550 nm) layers and titania (TiO2: refractive index 2.49 at 550 nm) layers at a deposition temperature of 100°C (eight layers in total). The dielectric multilayer film (II) is made by alternately laminating silica (SiO2) layers and titania (TiO2) layers at a deposition temperature of 100°C (eight layers in total). In both dielectric multilayer films (I) and (II), the silica and titania layers are alternately laminated in the following order from the substrate side: titania layer, silica layer, titania layer, silica layer, titania layer, silica layer, with the silica layer being the outermost layer of the optical component.

[0118] [Table 1]

[0119] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0120] [Example 4] In Example 4, dielectric multilayer films (III) and (IV) having the configurations shown in Table 2 were formed as near-infrared reflective films on the optical element obtained in Example 2, and an optical element with a thickness of 109 μm was obtained.

[0121] [Table 2]

[0122] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0123] [Example 5] In Example 5, a substrate (99 μm thick) consisting of an absorbing layer containing absorbent (XA) was prepared in the same manner as in Example 2, except that a solvent-soluble special polycarbonate resin (Iupizeta (registered trademark), PCZ-500) manufactured by Mitsubishi Gas Chemical Company, Inc. was used as resin (R-2) instead of resin (R-1). Resin layers 2 μm thick consisting of resin composition (1) were provided on both sides of the substrate, and an optical element 103 μm thick was prepared.

[0124] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0125] [Example 6] In Example 6, an optical member having a thickness of 104 μm and dielectric multilayer films on both sides was produced in the same manner as in Example 3, except that the optical member obtained in Example 5 was used instead of Example 2.

[0126] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0127] [Example 7] In Example 7, an optical member having a thickness of 108 μm and provided with a dielectric multilayer film on both sides was produced in the same manner as in Example 4, except that the optical member obtained in Example 5 was used.

[0128] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0129] [Example 8] In Example 8, instead of the absorbent (XA) used in Example 2, an absorbent (XB) containing 0.3 parts of absorbent (X-1), 0.08 parts of absorbent (X-2), 0.08 parts of absorbent (X-3), 0.4 parts of absorbent (X-5), 0.25 parts of absorbent (X-6), and 0.12 parts of absorbent (X-7) was used. A substrate consisting of an absorbent layer containing absorbent (XB) with a thickness of 98 μm, a length of 60 mm, and a width of 60 mm was obtained in the same manner as in Example 2.

[0130] An optical element having a thickness of 102 μm and having resin layers on both sides was obtained in the same manner as in Example 2, except that resin composition (2) prepared by adding 60 parts of tricyclodecane dimethanol acrylate, 40 parts of dipentaerythritol hexaacrylate, 5 parts of 1-hydroxycyclohexyl phenyl ketone, 0.025 parts of absorbent (X-4), and methyl ethyl ketone to adjust the resin concentration to 30 mass % was used instead of resin composition (1) on one side of the obtained substrate.

[0131] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0132] [Example 9] In Example 9, a substrate having a thickness of 50 μm and consisting of an absorbent layer was prepared in the same manner as in Example 2, except that the absorbent contained 0.16 parts of absorbent (X-2), 0.12 parts of absorbent (X-3), 0.4 parts of absorbent (X-8), and 0.6 parts of absorbent (X-9). Resin layers having a thickness of 2 μm and consisting of resin composition (1) were provided on both sides of the substrate, thereby obtaining an optical component having a thickness of 54 μm.

[0133] The optical properties of this optical element were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical element exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also revealed that it had less noise. Figure 3 shows the spectral transmission spectrum of light transmitted through this optical element when light was transmitted perpendicularly.

[0134] [Example 10] In Example 10, dielectric multilayer films (III) and (IV) having the configurations shown in Table 13 were formed on the optical element obtained in Example 9 in the same manner as in Example 4, and an optical element with a thickness of 59 μm was produced.

[0135] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. Extremely excellent incidence angle dependency was observed. The spectral transmission spectrum of light transmitted through this optical member from the perpendicular direction is shown in FIG.

[0136] [Example 11] In Example 11, an absorbent (XD) containing 0.05 parts of absorbent (X-2), 0.06 parts of absorbent (X-4), 0.4 parts of absorbent (X-5), 0.15 parts of absorbent (X-9), 0.15 parts of absorbent (X-10), 0.03 parts of absorbent (X-11), and 0.5 parts of absorbent (X-12) was used as the absorbent. In the same manner as in Examples 2 and 3, except that an absorbent (XD) containing 0.05 parts of absorbent (X-2), 0.06 parts of absorbent (X-4), 0.4 parts of absorbent (X-5), 0.15 parts of absorbent (X-9), 0.15 parts of absorbent (X-10), 0.15 parts of absorbent (X-11), and 0.5 parts of absorbent (X-12) was used as the absorbent, a 101 μm thick substrate consisting of an absorbent layer was prepared, and a 2 μm thick resin layer consisting of resin composition (1) was provided on both sides of the substrate. An optical element having a thickness of 106 μm and further comprising a dielectric multilayer film on both sides was prepared.

[0137] The optical properties of this optical element were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical element exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise. Figure 4 shows the spectral transmission spectrum of light transmitted through this optical element when light was transmitted perpendicularly.

[0138] [Example 12] In Example 12, an absorbent (XE) containing 0.004 parts of absorbent (X-4), 0.56 parts of absorbent (X-5), 0.2 parts of absorbent (X-9), 0.6 parts of absorbent (X-10), 1.0 part of absorbent (X-12), 0.6 parts of absorbent (X-13), and 0.05 parts of absorbent (X-14) was used as the absorbent. In the same manner as in Examples 2 and 3, except that an absorbent (XE) containing 0.004 parts of absorbent (X-4), 0.56 parts of absorbent (X-5), 0.2 parts of absorbent (X-9), 0.6 parts of absorbent (X-10), 1.0 part of absorbent (X-12), 0.6 parts of absorbent (X-13), and 0.05 parts of absorbent (X-14) was used, a 50 μm thick substrate consisting of an absorbent layer was prepared, and a 2 μm thick resin layer consisting of resin composition (1) was provided on both sides of the substrate, thereby preparing an optical component having a thickness of 55 μm and a dielectric multilayer film.

[0139] The optical properties of this optical element were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical element exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise. Figure 5 shows the spectral transmission spectrum of light transmitted through this optical element when light was transmitted perpendicularly.

[0140] [Example 13] In Example 13, an absorbent (XF) containing 0.1 parts of absorbent (X-1), 0.02 parts of absorbent (X-3), 0.02 parts of absorbent (X-4), 0.13 parts of absorbent (X-8), 0.35 parts of absorbent (X-12), 0.03 parts of absorbent (X-15), and 0.15 parts of absorbent (X-16) was used as the absorbent. In the same manner as in Examples 2 and 3, a 99 μm thick substrate consisting of an absorbent layer was prepared, and a 2 μm thick resin layer consisting of resin composition (1) was provided on both sides of the substrate. An optical element having a thickness of 104 μm and further comprising a dielectric multilayer film on both sides was prepared.

[0141] The optical properties of this optical element were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical element exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise. Figure 5 shows the spectral transmission spectrum of light transmitted through this optical element when light was transmitted perpendicularly.

[0142] [Example 14] In Example 14, an absorbent (XG) containing 0.06 parts of absorbent (X-2), 0.1 parts of absorbent (X-4), 0.08 parts of absorbent (X-5), 0.1 parts of absorbent (X-8), 0.8 parts of absorbent (X-9), 0.2 parts of absorbent (X-10), 0.5 parts of absorbent (X-12), and 0.08 parts of absorbent (X-16) was used as the absorbent. In the same manner as in Examples 2 and 3, except that an absorbent (XG) containing 0.06 parts of absorbent (X-2), 0.1 parts of absorbent (X-4), 0.08 parts of absorbent (X-5), 0.1 parts of absorbent (X-8), 0.8 parts of absorbent (X-9), 0.2 parts of absorbent (X-10), 0.5 parts of absorbent (X-12), and 0.08 parts of absorbent (X-16) was used as the absorbent, a 48 μm thick substrate consisting of an absorbent layer was prepared, and a 2 μm thick resin layer consisting of resin composition (1) was provided on both sides of the substrate. An optical element having a thickness of 53 μm and further comprising a dielectric multilayer film on both sides was prepared.

[0143] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0144] [Example 15] A transparent glass substrate "OA-10G" (thickness: 200 μm) manufactured by Nippon Electric Glass Co., Ltd. was prepared as the glass substrate (Y-1). The glass substrate was cut to a size of 200 mm x 200 mm, and a film of ethylene oxide isocyanurate modified triacrylate (trade name: Aronix) was applied to one side of the cut glass. M-315, manufactured by Toa Gosei Co., Ltd.) 30 parts, 1,9-nonanediol diacrylate 20 parts, methacrylic acid 20 parts, glycidyl methacrylate 30 parts, 3-glycidoxypropyltrimethoxysilane 5 parts, 1-hydroxycyclohexylbenzophenone (trade name: IRGACURE184, manufactured by BASF Japan Co., Ltd.) 5 parts and San-Aid SI-110 base agent (manufactured by Sanshin Chemical Industry Co., Ltd.) 1 part were mixed, and the solid content was 50 mass%. The resin composition (3) dissolved in propylene glycol monomethyl ether acetate was applied by spin coating so that the film thickness after drying would be about 1 μm, and the solvent was volatilized and removed by heating on a hot plate at 80 ° C. for 2 minutes, and a glass support having an adhesive layer formed on the glass substrate (Y-1) was produced.

[0145] Next, the cyclic polyolefin resin (resin (R-1)) 100 parts, absorbent (X) as absorbent (X-2) 0.5 parts, absorbent (X-4) 0.6 parts, absorbent (X-5) 4.0 parts, absorbent (X-9) 1.0 parts, absorbent (X-10) 1.5 parts, absorbent (X-11) 0.3 parts, and absorbent (X-12) 5.0 parts and dichloromethane were added, and the resin concentration was adjusted to 20 mass%. The absorbent layer forming solution (XH) was applied to the surface side of the glass support on which the adhesive layer was formed using a spin coater, so that the film thickness after drying was 10 μm. The solvent was volatilized and removed by heating on a hot plate at 80 ° C. for 5 minutes, thereby obtaining a laminated substrate having a thickness of 211 μm in which an absorbent layer containing an absorbent and a resin was laminated on one side of the glass substrate (Y-1).

[0146] Next, as in Example 3, a dielectric multilayer film (I) was formed on the surface of the absorption layer of the obtained laminated substrate, and a dielectric multilayer film (II) was further formed on the other surface of the laminated substrate, thereby obtaining an optical component with a thickness of 212 μm.

[0147] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0148] [Example 16] In Example 16, an absorber layer forming solution (XI) prepared in the same manner as in Example 15 was used, except that instead of the absorber layer forming solution (XH) in Example 15, 0.04 parts of absorber (X-2), 0.04 parts of absorber (X-4), 0.5 parts of absorber (X-9), and 0.03 parts of absorber (X-10) were used as absorbents, and an optical element having a thickness of 211 μm was obtained in the same manner as in Example 15, except that a fluorophosphate glass plate NF-50 (manufactured by AGC) (thickness: 200 μm) was used as the glass substrate (Y-2) instead of the glass base material (Y-1).

[0149] The optical properties of this optical element were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical element exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise. Figure 6 shows the spectral transmission spectrum of light transmitted through this optical element when light was transmitted perpendicularly.

[0150] [Example 17] In Example 17, a laminated substrate was obtained according to the procedure of Example 16, except that instead of the absorbent layer forming solution (XI), an absorbent layer forming solution (XJ) containing 0.5 parts of absorbent (X-1), 0.04 parts of absorbent (X-2), 0.1 parts of absorbent (X-5), 0.1 parts of absorbent (X-7), 0.5 parts of absorbent (X-10), and 0.04 parts of absorbent (X-11) was used.

[0151] Then, using the same procedure as in Example 3, a dielectric multilayer film (I) was formed on the absorption layer-forming surface of the laminated substrate, and a dielectric multilayer film (II) was further formed on the other surface of the laminated substrate, thereby obtaining an optical component with a thickness of 212 μm.

[0152] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0153] [Example 18] In Example 18, an optical element was prepared in the same manner as in Example 17, except that instead of the absorber layer forming solution (XJ), an absorber layer forming solution (XK) containing 0.04 parts of absorber (X-3), 0.01 parts of absorber (X-4), 0.5 parts of absorber (X-9), 0.1 parts of absorber (X-10), and 0.3 parts of absorber (X-15) was used as the absorbents, and further, C5000 (manufactured by HOYA Corporation) (thickness: 1.0 mm) was used as the glass substrate (Y-3).

[0154] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0155] [Example 19] In Example 19, a substrate consisting of an absorbent layer 100 μm thick was prepared by the method described in Example 2, except that the absorbent (XA) described in Example 1 was replaced with absorbent (XL) containing 0.3 parts of absorbent (X-1), 0.08 parts of absorbent (X-2), 0.08 parts of absorbent (X-3), and 0.04 parts of absorbent (X-4). 2 μm resin layers were then formed on both sides, and an optical component 104 μm thick was prepared.

[0156] Dielectric multilayer films (V) and (VI) having the configurations shown in Table 3 were formed as near-infrared reflective films on the obtained optical element, to obtain an optical element with a thickness of 109 μm. The dielectric multilayer film (V) was formed on the side on which the absorption layer was formed, and the dielectric multilayer film (VI) was formed on the other side.

[0157] [Table 3]

[0158] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0159] [Example 20] 100 parts of resin (R-1) and dichloromethane were added to a container to obtain a solution with a resin concentration of 20% by mass. The resulting solution was then cast onto a smooth glass plate, dried at 20°C for 8 hours, and then peeled off from the glass plate. The peeled coating film was further dried under reduced pressure at 100°C for 8 hours to obtain a transparent resin substrate (Z-1) with a thickness of 120 μm, length of 80 mm, and width of 80 mm. Next, an absorbing layer was laminated on the transparent substrate in the same manner as in Example 15, except that a transparent resin substrate (Z-1) was used instead of the glass substrate (Y-1), to obtain a laminated substrate having a thickness of 130 μm. Next, as in Example 3, a dielectric multilayer film (I) was formed on the surface of the absorption layer of the obtained laminated substrate, and a dielectric multilayer film (II) was further formed on the other surface of the laminated substrate, thereby obtaining an optical component with a thickness of 132 μm. The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. The obtained optical member exhibited excellent incidence angle dependency. Evaluation of the S / N ratio also showed that it had less noise.

[0160] [Comparative Example 1] In Comparative Example 1, dielectric multilayer films (VII) and (VIII) having the configurations shown in Table 4 were formed on a glass substrate (Y-1) without providing an absorption layer, and an optical member having a thickness of 208 μm was obtained.

[0161] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. Since no absorbent was used in the optical member, Δλ maxThe wavelength was extremely large at 43 nm, highly dependent on the angle of incidence, did not provide sufficient optical selectivity, and evaluation of the S / N ratio showed that there was a lot of noise. Figure 7 shows the spectral transmission spectra of the transmitted light at 0° incidence and 45° incidence when light was transmitted through this optical component from the perpendicular direction.

[0162] [Table 4]

[0163] Comparative Example 2 In Comparative Example 2, the glass substrate (Y-2), which was the aforementioned fluorophosphate glass plate NF-50 (manufactured by AGC), was used instead of the glass substrate (Y-1) described in Comparative Example 1, and dielectric multilayer films (IX) and (X) having the configurations shown in Table 5 were formed on both sides in the same manner as in Comparative Example 1, to obtain an optical member with a thickness of approximately 207 μm. The dielectric multilayer film (IX) functions as an anti-reflection film, and the dielectric multilayer film (X) functions as a near-infrared reflective film.

[0164] [Table 5]

[0165] The optical properties of this optical member were evaluated in the same manner as in Example 1. The results are shown in Table 7. However, since this optical member has only two stop bands, the FWHM max The spectral transmittance spectrum of this optical element is shown in Figure 8. Evaluation of the S / N ratio also revealed that there was a lot of noise.

[0166] Comparative Example 3 In Comparative Example 3, a substrate consisting of an absorbent layer having a thickness of 100 μm was prepared in the same manner as in Example 1, except that the absorbent (XA) described in Example 1 was replaced with absorbent (XM) containing 0.3 parts of absorbent (X-1), 0.08 parts of absorbent (X-2), 0.08 parts of absorbent (X-3), and 0.04 parts of absorbent (X-4).

[0167] The optical properties of this optical element were evaluated in the same manner as in Example 1. The results are shown in Table 7. However, the width of the stop band on the longest wavelength side of this optical element was only 37 nm, and the wavelengths of near-infrared light that cause noise could not be sufficiently removed, resulting in insufficient light selectivity. Evaluation of the S / N ratio also showed that there was a lot of noise. The spectral transmission spectrum of this optical element is shown in Figure 3.

[0168] Table 6 shows the absorbent contents of the absorbents (XA) to (XM) prepared in Examples 1 to 20 and Comparative Examples 1 to 3.

[0169] [Table 6]

[0170] Table 7 shows the evaluation results of the optical properties of the optical members obtained in Examples 1 to 20 and Comparative Examples 1 to 3.

[0171] [Table 7-1] [Table 7-2] [Industrial Applicability]

[0172] The optical member of the present invention can be suitably used in iris authentication systems, face authentication systems, fingerprint authentication systems, pulse oximeters, digital still cameras, smartphone cameras, mobile phone cameras, digital video cameras, wearable device cameras, PC cameras, surveillance cameras, automotive cameras, night vision cameras, motion capture, laser rangefinders, virtual try-on, license plate recognition devices, televisions, car navigation systems, liquid crystal projectors, personal digital assistants, video game consoles, portable game consoles, digital music players, and the like. [Explanation of symbols]

[0173] 1: Optical components 2: Spectrophotometer 3: Light

Claims

1. An optical element having at least one absorbing layer containing an absorbent having an absorption maximum in a wavelength range of 380 to 725 nm and a resin, the absorbing layer has at least three stop bands in the light wavelength range of 380 to 725 nm; The maximum transmittance of each stop band is 15% or less, and the width of the stop band on the longest wavelength side is 50 nm or more; A transmission band is provided between each of the blocking bands, and the minimum transmittance of each transmission band is 30% or more; An optical element having a maximum transmittance of 30% or less for wavelengths of 725 to 1000 nm.

2. 2. The optical member according to claim 1, wherein the absorbing layer further contains one or more absorbents that are different from the absorbent and have an absorption wavelength in the wavelength range of 380 to 725 nm.

3. 2. The optical member according to claim 1, wherein each of the transmission bands is in the range of 400 to 725 nm.

4. 2. The optical member according to claim 1, wherein the at least three stop bands are in the ranges of 380 to 530 nm, 455 to 630 nm, and 530 to 725 nm, respectively, and each stop band is in a different wavelength range.

5. The optical member according to any one of claims 1 to 4, wherein the absorber having an absorption maximum in a wavelength range of 380 to 725 nm is any one of an azomethine compound, an azopyridone compound, a pyrazolone azo compound, an indole compound, an anthraquinone compound, a coumarin compound, a dipyrromethene compound, a triarylmethane compound, a xanthene compound, a polymethine compound, a merocyanine compound, a benzylidene compound, a cyanine compound, a squarylium compound, a croconium compound, a perylene compound, a dioxazine compound, a phthalocyanine compound, a porphyrin compound, a tetraazaporphyrin compound, a subphthalocyanine compound, and a metal chelate compound thereof.

6. The optical member according to any one of claims 1 to 4, wherein any one of the absorbents having an absorption maximum in a wavelength range of 380 to 725 nm is an absorbent (a) having an absorption maximum in a wavelength range of 380 to 530 nm, an absorbent (b) having an absorption maximum in a wavelength range of 455 to 630 nm, or an absorbent (c) having an absorption maximum in a wavelength range of 530 to 725 nm.

7. The optical member according to any one of claims 1 to 4, wherein the resin comprises at least one transparent resin selected from the group consisting of cyclic (poly)olefin-based resins, aromatic polyether-based resins, polyimide-based resins, fluorene polycarbonate-based resins, fluorene polyester-based resins, polycarbonate-based resins, polyamide (aramid)-based resins, polyarylate-based resins, polysulfone-based resins, polyethersulfone-based resins, polyparaphenylene-based resins, polyamide imide-based resins, polyethylene naphthalate (PEN)-based resins, fluorinated aromatic polymer-based resins, (modified) acrylic resins, and epoxy-based resins.

8. The optical member according to any one of claims 1 to 4, wherein the optical member is a substrate made of the absorbing layer, or a laminated substrate in which the absorbing layer and another layer not containing the absorbent are laminated.

9. 9. The optical member according to claim 8, wherein the other layer not containing an absorbent is made of a resin substrate or a glass substrate, and the absorbing layer is provided on at least one surface of the resin substrate or the glass substrate.

10. 5. The optical member according to claim 1, which comprises a dielectric multilayer film.

Images