optical filter

Abstract

The present application relates to an optical filter having a substrate and a dielectric multilayer film laminated on at least one main surface side of the substrate and as an outermost layer, wherein the substrate has a resin film containing a pigment (U) having a maximum absorption wavelength in the range of 380 nm to 425 nm in dichloromethane, a pigment (A) having a maximum absorption wavelength in the range of 690 nm to 730 nm in dichloromethane, and a resin, and the optical filter satisfies all of the specific spectral characteristics (i-1) to (i-8).

Description

Technical Field

[0001] This invention relates to filters that transmit light in the visible wavelength range and block light in the ultraviolet and near-infrared wavelength ranges. Background Technology

[0002] In imaging devices using solid-state imaging elements, filters are used to transmit light in the visible light region (hereinafter also referred to as "visible light") and block light in the ultraviolet wavelength range (hereinafter also referred to as "ultraviolet light") and the near-infrared wavelength range (hereinafter also referred to as "near-infrared light") in order to reproduce tones well and obtain clear images.

[0003] Such filters can be categorized in various ways, such as alternating layers of dielectric films with different refractive indices (dielectric multilayer films) on one or both sides of a transparent substrate, or reflective filters that utilize light interference to reflect the light that is to be blocked.

[0004] Here, it is assumed that the maximum sensitivity of human vision is approximately 700 nm, while the maximum sensitivity of an image sensor mounted in an imaging device is approximately 1200 nm. When light in the near-infrared region beyond 700 nm enters the sensor without being blocked, the image differs from the image seen by the human eye, raising concerns about reduced image reproducibility. To bring the sensitivity ranges of both sensors closer together and correct color tone, a filter capable of blocking light in the near-infrared wavelength range, particularly the 1000 nm to 1200 nm wavelength range, is needed.

[0005] Furthermore, filters with dielectric multilayer films present several problems because the optical thickness of the multilayer film varies with the incident angle of light: changes in the spectral transmittance curve due to the incident angle; light leakage due to increased transmittance of ultraviolet and near-infrared light at high incident angles (where high reflectivity is expected); and noise caused by ultraviolet and near-infrared light reflected from the dielectric multilayer film. When using such filters, the spectral sensitivity of solid-state imaging elements may be affected by the incident angle. In particular, with the recent reduction in camera module height, use at high incident angles is envisioned. Therefore, a filter is needed that substantially does not affect the transmittance of visible light and blocks ultraviolet and near-infrared light independently of the incident angle.

[0006] Patent document 1 describes a filter with an average transmittance of less than 5% in the wavelength range of 1100nm to 1200nm.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: International Publication No. 2018 / 043564 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] The filter described in Patent Document 1 achieves low transmittance in the wavelength range of 1100nm to 1200nm by adding a pigment with an absorption band in the wavelength range of 1100nm to 1200nm. However, since the pigment also has an absorption band in the visible light region, not only is the transmittance in the long wavelength range reduced, but the transmittance in the visible light region is also reduced.

[0012] Therefore, the object of the present invention is to provide a filter having high visible light transmittance, high light blocking performance in the wavelength range of 1000nm to 1200nm, and suppressing the reduction of light blocking performance at high incident angles of ultraviolet and near-infrared light.

[0013] means for solving problems

[0014] The present invention provides a filter having the following configuration.

[0015] [1] A filter having a substrate and a dielectric multilayer film laminated on at least one main surface side of the substrate as the outermost layer, wherein,

[0016] The substrate has a resin film, the resin film containing pigment (U), pigment (A) and resin.

[0017] The pigment (U) has a maximum absorption wavelength in dichloromethane in the range of 380 nm to 425 nm, and the pigment (A) has a maximum absorption wavelength in dichloromethane in the range of 690 nm to 730 nm.

[0018] The filter satisfies all of the following spectral characteristics (i-1) to (i-8):

[0019] (i-1) In the spectral transmittance curve with an incident angle of 0 degrees, the average transmittance T in the wavelength range of 1000 nm to 1200 nm. 1000-1200(0度)AVE Below 1.5%;

[0020] (i-2) In the spectral transmittance curve at an incident angle of 40 degrees, the average transmittance T in the wavelength range of 1000 nm to 1200 nm. 1000-1200(40度)AVE Less than 10%;

[0021] (i-3) In the spectral transmittance curve with an incident angle of 0 degrees, the average transmittance T in the wavelength range of 440 nm to 600 nm. 440-600(0度)AVE It is over 90%;

[0022] (i-4) In the spectral transmittance curve with an incident angle of 40 degrees, the average transmittance T in the wavelength range of 440 nm to 600 nm. 440-600(40度)AVEIt is over 83%;

[0023] (i-5) The wavelength UV50 with 50% transmittance at an incident angle of 0 degrees. (0度) Within the range of 420nm to 435nm;

[0024] (i-6) Under the condition of an incident angle of 0 degrees, within the wavelength range of 350nm to 450nm, the wavelength at which the transmittance is 20% is set to UV20. (0度) Set the wavelength at 40% transmittance to UV40. (0度) Set the wavelength at 50% transmittance to UV50. (0度) ,

[0025] With an incident angle of 40 degrees, and within the wavelength range of 350 nm to 450 nm, the wavelength at which the transmittance is 20% is set to UV20. (40度) Set the wavelength at 40% transmittance to UV40. (40度) Set the wavelength at 50% transmittance to UV50. (40度) ,

[0026] at this time,

[0027] UV20 (0度) With UV20 (40度) The absolute value of the difference is less than 12nm.

[0028] UV40 (0度) With UV40 (40度) The absolute value of the difference is less than 12nm.

[0029] UV50 (0度) With UV50 (40度) The absolute value of the difference is less than 12nm;

[0030] (i-7) Under the condition of an incident angle of 0 degrees, within the wavelength range of 640 nm to 700 nm, the wavelength at which the transmittance is 20% is set to IR20. (0度) ,

[0031] With an incident angle of 40 degrees, and within the wavelength range of 640 nm to 700 nm, the wavelength at which the transmittance is 20% is set as IR20. (40度) ,

[0032] at this time,

[0033] IR20 (0度) With IR20 (40度) The absolute value of the difference is less than 15nm;

[0034] (i-8) Wavelength IR20 when the transmittance is 20% under the condition of an incident angle of 0 degrees. (0度) Within the range of 640nm to 700nm.

[0035] Invention Effects

[0036] According to the present invention, a filter is provided that has high visible light transmittance, high light blocking performance in the wavelength range of 1000 nm to 1200 nm, and suppresses the reduction of light blocking performance in the ultraviolet and near-infrared light at high incident angles. Attached Figure Description

[0037] Figure 1 A cross-sectional view is shown schematically as an example of a filter according to one embodiment.

[0038] Figure 2 A cross-sectional view is shown to schematically illustrate another example of a filter according to one embodiment.

[0039] Figure 3 A cross-sectional view is shown to schematically illustrate another example of a filter according to one embodiment.

[0040] Figure 4 A cross-sectional view is shown to schematically illustrate another example of a filter according to one embodiment.

[0041] Figure 5 A graph showing the spectral transmittance curve of the filter in Example 3-1. Detailed Implementation

[0042] The embodiments of the present invention will be described below.

[0043] In this specification, near-infrared absorbing pigments are sometimes referred to as "NIR pigments" and ultraviolet absorbing pigments are sometimes referred to as "UV pigments".

[0044] In this specification, the compound represented by formula (1) is referred to as compound (1). The same applies to compounds represented by other formulas. The pigment containing compound (1) is also referred to as pigment (1), and the same applies to other pigments. The group represented by formula (1) is also referred to as group (1), and the same applies to groups represented by other formulas.

[0045] In this specification, "internal transmittance" refers to the transmittance obtained by subtracting the effect of interface reflection from the measured transmittance, expressed by the formula {measured transmittance / (100 - reflectance)} × 100.

[0046] In this specification, the transmittance of the substrate and the transmittance of the resin film, including those containing pigments in the resin, are all referred to as "internal transmittance" when described as such. On the other hand, the transmittance measured by dissolving the pigment in a solvent such as dichloromethane and the transmittance of the filter having a dielectric multilayer film are measured transmittance.

[0047] In this specification, transmittance of 90% or more within a specific wavelength range means that the transmittance across the entire wavelength range is not less than 90%, i.e., the minimum transmittance within that wavelength range is 90% or more. Similarly, transmittance of 1% or less within a specific wavelength range means that the transmittance across the entire wavelength range does not exceed 1%, i.e., the maximum transmittance within that wavelength range is 1% or less. The same applies to internal transmittance. The average transmittance and average internal transmittance within a specific wavelength range are the arithmetic mean of the transmittance and internal transmittance per 1 nm within that wavelength range.

[0048] In this specification, the "~" sign indicating a numerical range includes both the upper and lower limits.

[0049] [Filter]

[0050] A filter according to one embodiment of the present invention (hereinafter also referred to as "this filter") is a filter having a substrate and a dielectric multilayer film laminated on at least one main surface side of the substrate as the outermost layer, and satisfying specific spectral characteristics described later. Here, the substrate has a resin film containing a pigment (U), a pigment (A), and a resin. The pigment (U) has a maximum absorption wavelength in dichloromethane in the range of 380 nm to 425 nm, and the pigment (A) has a maximum absorption wavelength in dichloromethane in the range of 690 nm to 730 nm. The pigment (U) is a UV pigment, and the pigment (A) is a NIR pigment. By containing pigments that absorb ultraviolet and near-infrared light in the substrate, the absorption characteristics of the substrate can be utilized to suppress the reduction of spectral characteristics of the dielectric multilayer film at high incident angles, such as light leakage or noise in the ultraviolet or near-infrared regions. The pigments and resins will be described later.

[0051] The configuration example of this filter will be described using the accompanying drawings. Figures 1-4 A cross-sectional view is shown schematically as an example of a filter according to one embodiment.

[0052] Figure 1 The filter 1A shown is an example of having a dielectric multilayer film 30 on one main surface side of the substrate 10. It should be noted that "having a specific layer on the main surface side of the substrate" is not limited to having the layer in contact with the main surface of the substrate, but also includes having other functional layers between the substrate and the layer.

[0053] Figure 2The filter 1B shown is an example of having a dielectric multilayer film 30 on both main surfaces of the substrate 10.

[0054] Figure 3 The filter 1C shown is an example of a substrate 10 having a support 11 and a resin film 12 laminated on one main side of the support 11. The filter 1C also has a dielectric multilayer film 30 on the resin film 12 and on the main side of the unlaminated resin film 12 of the support 11.

[0055] Figure 4 The filter 1D shown is an example of a substrate 10 having a support 11 and resin films 12 laminated on two main surfaces of the support 11. The filter 1D also has a dielectric multilayer film 30 on each resin film 12.

[0056] The filter of the present invention satisfies all of the following spectral characteristics (i-1) to (i-8).

[0057] (i-1) In the spectral transmittance curve with an incident angle of 0 degrees, the average transmittance T in the wavelength range of 1000 nm to 1200 nm. 1000-1200(0度)AVE Below 1.5%;

[0058] (i-2) In the spectral transmittance curve at an incident angle of 40 degrees, the average transmittance T in the wavelength range of 1000 nm to 1200 nm. 1000-1200(40度)AVE Less than 10%;

[0059] (i-3) In the spectral transmittance curve with an incident angle of 0 degrees, the average transmittance T in the wavelength range of 440 nm to 600 nm. 440-600(0度)AVE It is over 90%;

[0060] (i-4) In the spectral transmittance curve with an incident angle of 40 degrees, the average transmittance T in the wavelength range of 440 nm to 600 nm. 440-600(40度)AVE It is over 83%;

[0061] (i-5) The wavelength UV50 with 50% transmittance at an incident angle of 0 degrees. (0度) Within the range of 420nm to 435nm;

[0062] (i-6) Under the condition of an incident angle of 0 degrees, within the wavelength range of 350nm to 450nm, the wavelength at which the transmittance is 20% is set to UV20. (0度) Set the wavelength at 40% transmittance to UV40. (0度) Set the wavelength at 50% transmittance to UV50. (0度) ,

[0063] With an incident angle of 40 degrees, and within the wavelength range of 350 nm to 450 nm, the wavelength at which the transmittance is 20% is set to UV20. (40度) Set the wavelength at 40% transmittance to UV40. (40度) Set the wavelength at 50% transmittance to UV50. (40度) ,

[0064] at this time,

[0065] UV20 (0度) With UV20 (40度) The absolute value of the difference is less than 12nm.

[0066] UV40 (0度) With UV40 (40度) The absolute value of the difference is less than 12nm.

[0067] UV50 (0度) With UV50 (40度) The absolute value of the difference is less than 12nm;

[0068] (i-7) Under the condition of an incident angle of 0 degrees, within the wavelength range of 640 nm to 700 nm, the wavelength at which the transmittance is 20% is set to IR20. (0度) ,

[0069] With an incident angle of 40 degrees, and within the wavelength range of 640 nm to 700 nm, the wavelength at which the transmittance is 20% is set as IR20. (40度) ,

[0070] at this time,

[0071] IR20 (0度) With IR20 (40度) The absolute value of the difference is less than 15nm;

[0072] (i-8) Wavelength IR20 when the transmittance is 20% under the condition of an incident angle of 0 degrees. (0度) Within the range of 640nm to 700nm.

[0073] This filter, which satisfies all spectral characteristics (i-1) to (i-8), is a filter with high visible light transmittance, high blocking power for light in the wavelength range of 1000nm to 1200nm, and suppresses the reduction of blocking power for ultraviolet and near-infrared light at high incident angles.

[0074] By satisfying the spectral characteristics (i-1), it means excellent barrier properties in the range of 1000nm to 1200nm. 1000-1200(0度)AVE Preferably, it is 1% or less, more preferably 0.7% or less.

[0075] By satisfying the spectral characteristics (i-2), it means that the barrier properties are excellent even at high incident angles in the range of 1000 nm to 1200 nm. 1000-1200(40度)AVE Preferably, it is 8% or less, more preferably 7% or less.

[0076] By satisfying the spectral characteristic (i-3), it means that the transmittance in the visible light region is excellent. 440-600(0度)AVE Preferably, it is 91% or more, and more preferably 92% or more.

[0077] By satisfying the spectral characteristics (i-4), it means that the transmittance in the visible light region is excellent even at high incident angles. 440-600(40度)AVE Preferably, it is 85% or more, and more preferably 88% or more.

[0078] The spectral characteristics (i-5) indicate a shift in the UV cutoff band towards longer wavelengths, thereby improving blocking performance in the 1000nm–1200nm wavelength range. UV50 (0度) Preferably within the range of 420nm to 430nm.

[0079] By satisfying the spectral characteristics (i-6), it means that even at high incident angles, the shift is small before and after the UV absorption initiation band of 350nm to 450nm, resulting in excellent color reproducibility. In the spectral characteristics (i-6), UV20... (0度) With UV20 (40度) The absolute value of the difference is preferably less than 10 nm, more preferably less than 9 nm, UV40 (0度) With UV40 (40度) The absolute value of the difference is preferably less than 10 nm, more preferably less than 9 nm, UV50 (0度) With UV50 (40度) The absolute value of the difference is preferably 8 nm or less, and more preferably 7 nm or less.

[0080] By satisfying the spectral characteristics (i-7), it means that even at high incident angles, the shift before and after the NIR absorption initiation band of 640nm to 700nm is small, resulting in excellent color reproducibility. In the spectral characteristics (i-7), IR20... (0度) With IR20 (40度) The absolute value of the difference is preferably 13 nm or less, and more preferably 12 nm or less.

[0081] By satisfying the spectral characteristics (i-8), it means that it can cut off the near-infrared wavelength range beyond 700 nm and absorb most of the visible light region. In the spectral characteristics (i-8), IR20... (0度) Preferably within the range of 650nm to 680nm.

[0082] The filter of the present invention preferably also satisfies the following spectral characteristics (i-9).

[0083] (i-9) Under the condition of an incident angle of 0 degrees, within the wavelength range of 350nm to 450nm, the wavelength at which the transmittance is 10% is set to UV10. (0度) Set the wavelength at 50% transmittance to UV50. (0度) ,at this time,

[0084] UV10 (0度) With UV50 (0度) The absolute value of the difference is less than 15nm.

[0085] By satisfying the spectral characteristic (i-9), it means that the slope of the spectral transmittance curve is steep before and after the UV absorption initiation band with wavelengths of 350 nm to 450 nm. The spectral characteristic (i-9) is more preferably below 8 nm, and particularly preferably below 7 nm.

[0086] The substrate and the dielectric multilayer film will be described below. This filter is designed, for example, to enable the substrate to absorb ultraviolet and near-infrared light, and to satisfy the above-mentioned spectral characteristics (i-1) to (i-8) by utilizing the absorption characteristics of the substrate and the reflection characteristics of the dielectric multilayer film.

[0087] <Dielectric Multilayer Film>

[0088] In this filter, a dielectric multilayer film is stacked on at least one main surface side of the substrate and serves as the outermost layer.

[0089] In this filter, the dielectric multilayer film preferably satisfies all of the following spectral characteristics (iv-1) to (iv-8).

[0090] (iv-1) The wavelength UV50 with 50% transmittance at an incident angle of 0 degrees. (0度) Within the range of 420nm to 430nm;

[0091] (iv-2) In the spectral transmittance curve with an incident angle of 0 degrees, the average transmittance T in the wavelength range of 440 nm to 600 nm. 440-600(0度)AVE It is over 90%;

[0092] (iv-3) In the spectral transmittance curve with an incident angle of 0 degrees, the minimum transmittance T in the wavelength range of 440 nm to 600 nm. 440-600(0度)MIN It is over 90%;

[0093] (iv-4) In the spectral transmittance curve at an incident angle of 40 degrees, the average transmittance T in the wavelength range of 440 nm to 600 nm. 440-600(40度)AVE It is over 90%;

[0094] (iv-5) In the spectral transmittance curve at an incident angle of 40 degrees, the minimum transmittance T in the wavelength range of 440 nm to 600 nm. 440-600(40度)MIN It is over 80%;

[0095] (iv-6) Wavelength IR20 with 20% transmittance at an incident angle of 0 degrees. (0度) Within the range of 680nm to 740nm;

[0096] (iv-7) In the spectral transmittance curve with an incident angle of 0 degrees, the average transmittance T in the wavelength range of 1000 nm to 1200 nm. 1000-1200(0度)AVE Below 1.5%;

[0097] (i-8) In the spectral transmittance curve at an incident angle of 40 degrees, the average transmittance T in the wavelength range of 1000 nm to 1200 nm. 1000-1200(40度)AVE It is below 10%.

[0098] By satisfying the spectral characteristics (iv-1), it means that the center of the UV cutoff band is in the range of 420nm to 430nm. UV50 (0度) Preferably within the range of 420nm to 427nm.

[0099] By satisfying the spectral characteristics (iv-2), it implies excellent transmittance in the visible light region. T 440-600(0度)AVE Preferably, it is 91% or more, and more preferably 92% or more.

[0100] By satisfying the spectral characteristics (iv-3), it means that the transmittance in the visible light region is excellent. 440-600(0度)MIN Preferably, it is 91% or more, and more preferably 92% or more.

[0101] By satisfying the spectral characteristics (iv-4), it means that the transmittance in the visible light region is excellent even at high incident angles. 440-600(40度)AVE Preferably, it is 91% or more, and more preferably 92% or more.

[0102] By satisfying the spectral characteristics (iv-5), it means that the transmittance in the visible light region is excellent even at high incident angles. 440-600(40度)MIN Preferably, it is 82% or more, and more preferably 85% or more.

[0103] By satisfying the spectral characteristics (iv-6), it is possible to fabricate a filter that blocks light in the near-infrared wavelength range beyond 700 nm while exhibiting low incident angle dependence. IR20 (0度) Preferably, it is in the range of 660nm to 700nm, and more preferably in the range of 660nm to 690nm.

[0104] By satisfying the spectral characteristics (iv-7), it means excellent light blocking performance in the long wavelength range of 1000nm to 1200nm. 1000-1200(0度)AVE Preferably, it is 1.2% or less, more preferably 1% or less.

[0105] By satisfying the spectral characteristics (iv-8), it means that the light blocking performance is excellent even at high incident angles in the long wavelength range of 1000 nm to 1200 nm. 1000-1200(40度)AVE Preferably, it is 9% or less, more preferably 8% or less.

[0106] For the transmission band of a dielectric multilayer film, the entire light-blocking band can be shifted towards a longer or shorter wavelength side by adjusting the film thickness, etc. In this invention, by shifting the entire light-blocking band of the multilayer film towards a longer wavelength side as shown in characteristics (iv-1) and (iv-6), light in the 1000nm to 1200nm band can be blocked using the multilayer film as shown in characteristic (iv-7). Therefore, a filter with excellent light-blocking properties in the 1000nm to 1200nm range, as shown in the above spectral characteristic (i-1), can be obtained.

[0107] On the other hand, when the entire light blocking band is shifted towards longer wavelengths to block light in the 1000nm to 1200nm range, oblique incidence shift in the ultraviolet region of 400nm to 430nm is likely to occur. This oblique incidence shift is preferably compensated for by the absorption characteristics of the UV dye (U) described later. Specifically, by including a UV dye in the resin film that satisfies the spectral characteristics (ii-1) described later, i.e., a UV dye with a steep slope in the spectral transmittance curve in the UV absorption band of 400nm to 430nm, a resin film that satisfies the spectral characteristics (iii-4) described later, i.e., a resin film with a steep slope in the spectral transmittance curve in the UV absorption band of 400nm to 430nm, can be obtained. By combining this resin film with the above-described dielectric multilayer film, a filter that suppresses the oblique incidence shift in the ultraviolet region as shown in the above-described spectral characteristics (i-6) can be obtained.

[0108] In this filter, at least one of the preferred dielectric multilayer films is designed as a near-infrared reflective layer (hereinafter also referred to as an NIR reflective layer). The other preferred dielectric multilayer film is designed as an NIR reflective layer, a reflective layer having a reflective region other than the near-infrared region, or an anti-reflective layer.

[0109] A NIR reflective layer is a dielectric multilayer film designed to block light in the near-infrared region. For example, an NIR reflective layer may transmit visible light and primarily reflect light in the near-infrared region, excluding the light-blocking region of the resin film acting as an absorption layer. It should be noted that the reflective region of the NIR reflective layer may also include the light-blocking region of the resin film in the near-infrared region. The NIR reflective layer may also be appropriately designed to block light in wavelength ranges other than the near-infrared region, such as near-ultraviolet light, in addition to its NIR reflective properties.

[0110] The NIR reflective layer is, for example, a dielectric multilayer film obtained by alternating layers of a low-refractive-index dielectric film and a high-refractive-index dielectric film. The refractive index of the high-refractive-index film is preferably 1.6 or higher, more preferably 2.2 to 2.5. Examples of materials for the high-refractive-index film include Ta₂O₅, TiO₂, and Nb₂O₅. Among these, TiO₂ is preferred from the viewpoints of film formation properties, reproducibility of refractive index, and stability.

[0111] On the other hand, the refractive index of the low-refractive-index film is preferably less than 1.6, more preferably greater than or equal to 1.45 and less than 1.55. Examples of materials that can be used for low-refractive-index films include SiO2 and SiO2. x N y From the perspectives of film-forming reproducibility, stability, and economy, SiO2 is preferred.

[0112] To shift the light-blocking band of the NIR reflector to longer wavelengths, one approach is to combine multiple dielectric multilayers with different spectral characteristics when transmitting and selecting the desired band. In this case, by increasing the film thickness without changing the thickness ratio of silicon dioxide and titanium dioxide constituting the multilayer film, the light-blocking band can be lengthened. Specifically, the desired light-blocking band can be adjusted by increasing the thickness of the silicon dioxide and titanium dioxide by 1% to 8%.

[0113] Regarding the NIR reflective layer, in order to shift the light blocking band towards the longer wavelength side and block light in the range of 1000nm to 1200nm, the total number of layers of the dielectric multilayer film constituting the reflective layer is preferably 20 or more, more preferably 30 or more, and even more preferably 35 or more. With such a number of layers, light in the range of 1000nm to 1200nm can be blocked using the dielectric multilayer film. Furthermore, this is also preferable from the viewpoint that the transmittance can change sharply within the boundary wavelength range between the transmission region and the light blocking region. However, when the total number of layers increases, warping or an increase in film thickness may occur. Therefore, the total number of layers is preferably 100 or less, more preferably 75 or less, and even more preferably 60 or less.

[0114] In addition, the overall thickness of the reflective layer is preferably 2μm to 10μm.

[0115] If the total number of layers and the thickness of the dielectric multilayer film are within the above range, the NIR reflective layer meets the requirements for miniaturization and can suppress incident angle dependence while maintaining high productivity.

[0116] In addition, in the formation of dielectric multilayer films, vacuum film formation processes such as CVD, sputtering, and vacuum evaporation can be used; wet film formation processes such as spraying and immersion can also be used.

[0117] A specific spectral characteristic can be imparted using a single NIR reflective layer (a set of dielectric multilayer films), or it can be imparted using two or more NIR reflective layers. When there are two or more NIR reflective layers, each reflective layer can have the same or different configurations. Typically, multiple reflective layers with different reflection bands are used. In the case of two NIR reflective layers, one layer can be a near-infrared reflective layer that blocks short-wavelength light in the near-infrared region, and the other layer can be a near-infrared / near-ultraviolet reflective layer that blocks both long-wavelength and near-ultraviolet light in the near-infrared region.

[0118] Examples of antireflective layers include: multilayer dielectric films, intermediate refractive index media, and moth-eye structures with gradually changing refractive index. Among these, multilayer dielectric films are preferred from the perspective of optical efficiency and productivity. Like reflective layers, antireflective layers are obtained by alternately stacking dielectric films.

[0119] <Substrate>

[0120] In the filter of the present invention, the substrate has a resin film containing a pigment (U), a pigment (A) described later, and a resin.

[0121] <Spectral properties of resin films>

[0122] The resin film preferably satisfies all of the following spectral characteristics (iii-1) to (iii-6).

[0123] (iii-1) The internal transmittance at a wavelength of 400 nm in the spectral transmittance curve is less than 2%;

[0124] (iii-2) Average internal transmittance T in the wavelength range of 400 nm to 420 nm in the spectral transmittance curve 400-420AVE Less than 5%;

[0125] (iii-3) The wavelength UV50 when the internal transmittance is 50% is in the range of 415nm to 440nm;

[0126] (iii-4) Within the wavelength range of 400nm to 430nm, the wavelength with an internal transmittance of 10% is set as UV10, and the wavelength with an internal transmittance of 50% is set as UV50. At this time,

[0127] The absolute value of the difference between UV10 and UV50 is less than 15nm;

[0128] (iii-5) Average internal transmittance T in the wavelength range of 440 nm to 550 nm in the spectral transmittance curve 440-550AVE It is over 93%;

[0129] (iii-6) The wavelength IR20 when the internal transmittance is 20% is in the range of 650nm to 700nm.

[0130] By satisfying the spectral characteristics (iii-1), it means excellent light blocking performance against ultraviolet light around 400 nm. 400 Preferably, it is 1.5% or less, more preferably 1% or less.

[0131] By satisfying the spectral characteristics (iii-2), it means excellent light blocking performance for ultraviolet light in the range of 400 nm to 420 nm. 400-420AVE Preferably, it is 4.5% or less, more preferably 4% or less.

[0132] By satisfying the spectral characteristics (iii-3), it means that the center of the UV cutoff band is in the range of 415 nm to 440 nm. UV50 is preferably in the range of 420 nm to 435 nm.

[0133] By satisfying the spectral characteristic (iii-4), it means that the slope of the spectral transmittance curve is steep before and after the UV absorption initiation band with wavelengths of 400 nm to 430 nm. The spectral characteristic (iii-4) is preferably below 14 nm, and more preferably below 13 nm.

[0134] By satisfying the spectral characteristics (iii-5), it means that the transmittance in the visible light region is excellent. 440-550AVE Preferably, it is 94% or more, and more preferably 95% or more.

[0135] By satisfying the spectral characteristics (iii-6), it is possible to obtain a filter with a small oblique incidence offset by combining it with the aforementioned dielectric multilayer film that transmits visible light while blocking light in the range beyond 700 nm. In the spectral characteristics (iii-6), IR20 is preferably in the range of 660 nm to 690 nm.

[0136] The resin film preferably also satisfies the following spectral characteristics (iii-7) to (iii-8).

[0137] (iii-7) The average internal transmittance T in the wavelength range of 350 nm to 390 nm in the spectral transmittance curve 350-390AVE is 10% or less;

[0138] (iii-8) The average internal transmittance T in the wavelength range of 400 nm to 430 nm in the spectral transmittance curve 400-430AVE is 15% or less.

[0139] By satisfying the spectral characteristic (iii-7) and the spectral characteristic (iii-8), it means that ultraviolet light can be blocked in a wide range. T 350-390AVE Preferably it is 9% or less, more preferably 8% or less. T 400-430AVE Preferably it is 14% or less, more preferably 13% or less.

[0140] <UV pigment>

[0141] The pigment (U) is a UV pigment having a maximum absorption wavelength in the range of 380 nm to 425 nm in dichloromethane. By containing this pigment, ultraviolet light can be effectively cut off.

[0142] The pigment (U) preferably has a maximum absorption wavelength in the range of 385 nm to 420 nm in dichloromethane, more preferably in the range of 390 nm to 420 nm.

[0143] In addition, the pigment (U) preferably satisfies the following spectral characteristic (ii-1).

[0144] (ii-1) In the wavelength range of 400 nm to 430 nm, when the wavelength at which the transmittance in dichloromethane is 10% is set as UV10, and the wavelength at which the transmittance in dichloromethane is 50% is set as UV50, then

[0145] the absolute value of the difference between UV10 and UV50 is preferably 18 nm or less, more preferably 16 nm or less.

[0146] By satisfying the spectral characteristic (ii-1), it means that the slope of the spectral transmittance curve is steep before and after the UV absorption starting band.

[0147] As the pigment (U), examples include: azole pigments, merocyanine pigments, cyanine pigments, naphthalene dicarboximide pigments, diazole pigments, azine pigments, oxazolidine pigments, naphthalenedicarboxylic acid pigments, styryl pigments, anthracene pigments, cyclic carbonyl pigments, triazole pigments, etc. Among them, merocyanine pigments are particularly preferred. In addition, one kind can be used alone, or two or more kinds can be used in combination.

[0148] As a pigment (U), anthocyanin pigment represented by the following formula (M) is particularly preferred.

[0149]

[0150] The symbols in equation (M) are as follows.

[0151] R 1 This indicates a monovalent hydrocarbon group with 1 to 12 carbon atoms that can have substituents.

[0152] As substituents, alkoxy, acyl, acyloxy, cyano, dialkylamino, or chlorine atoms are preferred. The number of carbon atoms in the aforementioned alkoxy, acyl, acyloxy, and dialkylamino groups is preferably 1 to 6.

[0153] R as a non-substituent 1 Specifically, the preferred alkyl groups having 1 to 12 carbon atoms in which a portion of the hydrogen atom can be replaced by an aliphatic ring, an aromatic ring, or an alkenyl group; cycloalkyl groups having 3 to 8 carbon atoms in which a portion of the hydrogen atom can be replaced by an aromatic ring, an alkyl group, or an alkenyl group; and aryl groups having 6 to 12 carbon atoms in which a portion of the hydrogen atom can be replaced by an aliphatic ring, an alkyl group, or an alkenyl group.

[0154] In R 1 When the alkyl group is unsubstituted, it can be a straight-chain alkyl group or a branched alkyl group, and more preferably has 1 to 6 carbon atoms.

[0155] In R 1 When the alkyl group having 1 to 12 carbon atoms is in the case where a portion of the hydrogen atom is replaced by an aliphatic ring, an aromatic ring, or an alkenyl group, it is more preferably an alkyl group having 1 to 4 carbon atoms that has a cycloalkyl group having 3 to 6 carbon atoms, or an alkyl group having 1 to 4 carbon atoms that is substituted by a phenyl group, and particularly preferably an alkyl group having 1 or 2 carbon atoms that is substituted by a phenyl group. It should be noted that an alkenyl-substituted alkyl group refers to a group that is entirely alkenyl but does not have an unsaturated bond between the 1 and 2 positions, such as allyl, 3-butenyl, etc.

[0156] Preferred R 1 An alkyl group having 1 to 6 carbon atoms, in which a portion of a hydrogen atom can be replaced by a cycloalkyl or phenyl group. Particularly preferred is R. 1 Alkyl groups having 1 to 6 carbon atoms, specifically including: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, etc.

[0157] R 2 ~R 5 Each of the following can be independently represented: a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms. The alkyl and alkoxy groups preferably have 1 to 6 carbon atoms, more preferably 1 to 4.

[0158] R 2 and R 3 Preferably, at least one of them is an alkyl group, and more preferably, all of them are alkyl groups. In R 2 and R 3 In the absence of an alkyl group, a hydrogen atom is more preferred. 2 and R 3 Especially preferred are alkyl groups having 1 to 6 carbon atoms.

[0159] R 4 and R 5 Preferably, at least one of them is a hydrogen atom, more preferably, all of them are hydrogen atoms. In R 4 Or R 5 In the absence of hydrogen atoms, alkyl groups with 1 to 6 carbon atoms are preferred.

[0160] Y indicates that R 6 and R 7 Substituted methylene or oxygen atom.

[0161] R 6 and R 7 Each can be independently represented by a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms.

[0162] X represents any one of the divalent groups represented by the following formulas (X1) to (X5).

[0163]

[0164] R 8 and R 9 Each can independently represent a monovalent hydrocarbon group with 1 to 12 carbon atoms that can have substituents; R 10 ~R 19 Each can independently represent a hydrogen atom or a monovalent hydrocarbon group with 1 to 12 carbon atoms that may have substituents.

[0165] As R 8 ~R 19 Substituents, such as those with R, can be listed. 1 Substituents in R are the same, and the preferred method is also the same. 8 ~R 19 In the case of a hydrocarbon group without substituents, examples of R groups without substituents can be listed. 1 The same method.

[0166] In equation (X1), R 8 and R 9 They can be different groups, but are preferably the same group. In R 8 and R 9When the alkyl group is unsubstituted, it can be a straight-chain alkyl group or a branched-chain alkyl group, and the number of carbon atoms is more preferably 1 to 6.

[0167] Preferred R 8 and R 9 All are alkyl groups having 1 to 6 carbon atoms, in which a hydrogen atom can be substituted by a cycloalkyl or phenyl group. Particularly preferred are R... 8 and R 9 All of them are alkyl groups with 1 to 6 carbon atoms. Specifically, examples include: methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, etc.

[0168] In equation (X2), R 10 and R 11 More preferably, all are alkyl groups having 1 to 6 carbon atoms, R 10 and R 11 The same alkyl group is particularly preferred.

[0169] In equation (X3), R 12 and R 15 Preferably, the alkyl group consists of 1 to 6 carbon atoms, either all of which are hydrogen atoms or without substituents. R is composed of two groups bonded to the same carbon atom. 13 and R 14 Preferably, all of them are hydrogen atoms, or all of them are alkyl groups with 1 to 6 carbon atoms.

[0170] In formula (X4), two groups R bonded to the same carbon atom 16 and R 17 and R 18 and R 19 Preferably, all of them are hydrogen atoms, or all of them are alkyl groups with 1 to 6 carbon atoms.

[0171] As compound (M), the following compounds (M1), (M2), and (M3) are preferred.

[0172] Compound (M1) is the compound in formula (M) where Y represents the reaction of R. 6 and R 7 The substituted methylene group and X represent compounds with a divalent group represented by formula (X1).

[0173] Compound (M2) is a compound in which Y in formula (M) represents an oxygen atom and X represents a divalent group represented by formula (X1).

[0174] Compound (M3) is the compound represented by Y in formula (M), where Y represents the reaction with R. 6 and R 7 The substituted methylene group and X represent compounds with a divalent group represented by formula (X2).

[0175] As a pigment (U), it is preferable to include a compound (M1) with a maximum absorption wavelength around 420 nm and a steep spectral transmittance curve near the ultraviolet absorption band.

[0176] Furthermore, as a pigment (U), it is more preferable to include compounds (M1) and (M2). By combining the two UV pigments, the average transmittance in the range of 400 nm to 420 nm can be reduced.

[0177] Furthermore, as pigments (U), compounds (M1), (M2), and (M3) are particularly preferred. By combining the three UV pigments, the average transmittance can be reduced over a wider wavelength range of 400 nm to 430 nm.

[0178] As specific examples of compounds (M1) that can be used as pigments (U), the compounds shown in the table below can be listed.

[0179] Table 1

[0180] Pigment code <![CDATA[R 1 ]]> <![CDATA[R 2 、R 3 ]]> <![CDATA[R 4 、R 5 ]]> Y X <![CDATA[R 8 、R 9 ]]> M1-1 <![CDATA[-CH3]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-CH2-CH(CH3)2]]> M1-2 <![CDATA[-C2H5]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-CH2-CH(CH3)2]]> M1-3 <![CDATA[-CH(CH3)2]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-CH2-CH(CH3)2]]> M1-4 <![CDATA[-nC3H7]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-CH2-CH(CH3)2]]> M1-5 <![CDATA[-CH3]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-nC3H7]]> M1-6 <![CDATA[-C2H5]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-nC3H7]]> M1-7 <![CDATA[-CH(CH3)2]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-nC3H7]]> M1-8 <![CDATA[-nC3H7]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-nC3H7]]> M1-9 <![CDATA[-CH3]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-CH3]]> M1-10 <![CDATA[-C2H5]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-CH3]]> M1-11 <![CDATA[-CH(CH3)2]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-CH3]]> M1-12 <![CDATA[-nC3H7]]> H H <![CDATA[-CH2-]]> X1 <![CDATA[-CH3]]> M1-13 <![CDATA[-CH3]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-CH2-CH(CH3)2]]> M1-14 <![CDATA[-C2H5]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-CH2-CH(CH3)2]]> M1-15 <![CDATA[-CH(CH3)2]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-CH2-CH(CH3)2]]> M1-16 <![CDATA[-nC3H7]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-CH2-CH(CH3)2]]> M1-17 <![CDATA[-CH3]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-nC3H7]]> M1-18 <![CDATA[-C2H5]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-nC3H7]]> M1-19 <![CDATA[-CH(CH3)2]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-nC3H7]]> M1-20 <![CDATA[-nC3H7]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-nC3H7]]> M1-21 <![CDATA[-CH3]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-CH3]]> M1-22 <![CDATA[-C2H5]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-CH3]]> M1-23 <![CDATA[-CH(CH3)2]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-CH3]]> M1-24 <![CDATA[-nC3H7]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X1 <![CDATA[-CH3]]>

[0181] As specific examples of compounds (M2) that can be used as pigments (U), the compounds shown in the table below can be listed.

[0182] Table 2

[0183] Pigment code <![CDATA[R 1 ]]> <![CDATA[R 2 、R 3 ]]> <![CDATA[R 4 、R 5 ]]> Y X <![CDATA[R 8 、R 9 ]]> M2-1 <![CDATA[-CH3]]> H H O X1 <![CDATA[-CH3]]> M2-2 <![CDATA[-C2H5]]> H H O X1 <![CDATA[-CH3 <!-- 11 -->]]> M2-3 <![CDATA[-CH(CH3)2]]> H H O X1 <![CDATA[-CH3]]> M2-4 <![CDATA[-nC3H7]]> H H O X1 <![CDATA[-CH3]]> M2-5 <![CDATA[-CH3]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-CH3]]> M2-6 <![CDATA[-C2H5]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-CH3]]> M2-7 <![CDATA[-CH(CH3)2]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-CH3]]> M2-8 <![CDATA[-nC3H7]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-CH3]]> M2-9 <![CDATA[-CH3]]> H H O X1 <![CDATA[-nC3H7]]> M2-10 <![CDATA[-C2H5]]> H H O X1 <![CDATA[-nC3H7]]> M2-11 <![CDATA[-CH(CH3)2]]> H H O X1 <![CDATA[-nC3H7]]> M2-12 <![CDATA[-nC3H7]]> H H O X1 <![CDATA[-nC3H7]]> M2-13 <![CDATA[-CH3]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-nC3H7]]> M2-14 <![CDATA[-C2H5]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-nC3H7]]> M2-15 <![CDATA[-CH(CH3)2]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-nC3H7]]> M2-16 <![CDATA[-nC3H7]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-nC3H7]]> M2-17 <![CDATA[-CH3]]> H H O X1 <![CDATA[-CH2-CH(CH3)2]]> M2-18 <![CDATA[-C2H5]]> H H O X1 <![CDATA[-CH2-CH(CH3)2]]> M2-19 <![CDATA[-CH(CH3)2]]> H H O X1 <![CDATA[-CH2-CH(CH3)2]]> M2-20 <![CDATA[-nC3H7]]> H H O X1 <![CDATA[-CH2-CH(CH3)2]]> M2-21 <![CDATA[-CH3]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-CH2-CH(CH3)2]]> M2-22 <![CDATA[-C2H5]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-CH2-CH(CH3)2]]> M2-23 <![CDATA[-CH(CH3)2]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-CH2-CH(CH3)2]]> M2-24 <![CDATA[-nC3H7]]> <![CDATA[-CH3]]> H O X1 <![CDATA[-CH2-CH(CH3)2]]>

[0184] As specific examples of compounds (M3) that can be used as pigments (U), the compounds shown in the table below can be listed.

[0185] Table 3

[0186] Pigment code <![CDATA[R 1 ]]> <![CDATA[R 2 、R 3 ]]> <![CDATA[R 4 、R 5 ]]> Y X <![CDATA[R 10 、R 11 ]]> M3-1 <![CDATA[-CH3]]> H H <![CDATA[-CH2-]]> X2 <![CDATA[-CH3]]> M3-2 <![CDATA[-C2H5]]> H H <![CDATA[-CH2-]]> X2 <![CDATA[-CH3]]> M3-3 <![CDATA[-CH(CH3)2]]> H H <![CDATA[-CH2-]]> X2 <![CDATA[-CH3]]> M3-4 <![CDATA[-nC3H7]]> H H <![CDATA[-CH2-]]> X2 <![CDATA[-CH3]]> M3-5 <![CDATA[-CH3]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X2 <![CDATA[-CH3]]> M3-6 <![CDATA[-C2H5]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X2 <![CDATA[-CH3]]> M3-7 <![CDATA[-CH(CH3)2]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X2 <![CDATA[-CH3]]> M3-8 <![CDATA[-nC3H7]]> <![CDATA[-CH3]]> H <![CDATA[-CH2-]]> X2 <![CDATA[-CH3]]>

[0187] As compounds (M), among these compounds, compounds M1-1 to M1-4 are preferred from the viewpoints of solubility in resins or solvents, visible light transmittance, maximum absorption wavelength, and especially the ability to satisfy spectral characteristics (ii-1). Furthermore, compounds M2-5 to M2-8 are preferred from the viewpoints of solubility in resins or solvents, visible light transmittance, maximum absorption wavelength, and ease of synthesis. Compounds M3-5 to M3-8 are preferred from the viewpoints of solubility in resins or solvents, visible light transmittance, and maximum absorption wavelength.

[0188] In addition, in the case of using two compounds (M) having different structures in combination, from the viewpoint of effectively expanding the absorption band in the range of 400 nm to 430 nm, a combination of one compound selected from compounds M1-1 to M1-4 and one compound selected from compounds M2-5 to M2-8 is preferred. In the case of using three compounds (M) having different structures in combination, from the viewpoints of effectively expanding the absorption band in the range of 400 nm to 430 nm and the absorption band in the short wavelength range of 350 nm to 395 nm, a combination of one compound selected from compounds M1-1 to M1-4, one compound selected from compounds M2-5 to M2-8, and one compound selected from compounds M3-5 to M3-8 is preferred.

[0189] It should be noted that the compound (M) can be produced by a known method.

[0190] With respect to 100 parts by mass of the resin, the content of the UV pigment (U) in the resin film is preferably 0.1 part by mass to 15 parts by mass, more preferably 1 part by mass to 10 parts by mass. If it is within this range, it is not likely to cause a decrease in resin properties.

[0191] <NIR pigment>

[0192] In the filter of the present invention, the substrate contains the above-mentioned pigment (U) and pigment (A).

[0193] The pigment (A) is a NIR pigment having a maximum absorption wavelength in the range of 690 nm to 730 nm in dichloromethane. By containing this pigment, infrared light can be effectively cut off.

[0194] As the pigment (A), it is preferably selected from squaraine pigments, cyanine pigments, phthalocyanine pigments, naphthalocyanine pigments, dithiol metal complex pigments, azo pigments, polymethine pigments, phthalide pigments, naphthoquinone pigments, anthraquinone pigments, indophenol pigments, pyran pigments, thiopyran pigments, croconic acid pigments, tetradehydrocholine pigments, triphenylmethane pigments, ammonium pigments, and diammonium pigments.

[0195] Among these NIR pigments, from the viewpoint of spectral characteristics, squaraine pigments are preferred.

[0196] As the squaraine pigment, a compound represented by the following formula (I) is preferred.

[0197]

[0198] Among them, the symbols in the formula (I) are as described below.

[0199] R 24 and R 26 Each of the following can be independently represented: hydrogen atom, halogen atom, hydroxyl group, alkyl group with 1 to 6 carbon atoms or alkoxy group with 1 to 6 carbon atoms, acyloxy group with 1 to 10 carbon atoms, -NR. 27 R 28 (R 27 and R 28 Each independently represents a hydrogen atom, an alkyl group with 1 to 20 carbon atoms, or a -C(=O)-R group. 29 (R 29 -NHR represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms that may have substituents, an aryl group having 6 to 11 carbon atoms that may have substituents, or an aralkyl group having 7 to 18 carbon atoms that may have substituents and may have oxygen atoms between carbon atoms. 30 or -SO2-R 30 (R 30 Each group represents one or more hydrogen atoms that can be substituted with halogen atoms, hydroxyl groups, carboxyl groups, sulfonyl groups, or cyano groups, and may contain unsaturated bonds, oxygen atoms, saturated or unsaturated ring structures of 1 to 25 carbon atoms (hydrocarbon groups), or groups represented by the following formula (S) (R). 41 and R 42 Independently represents a hydrogen atom, a halogen atom, or an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms. (k is 2 or 3).

[0200]

[0201] R 21 and R 22 They can connect with each other and form 5- or 6-membered heterocycles A and R together with nitrogen atoms. 22 and R 25 They can connect with each other and form 5- or 6-membered heterocycles B and R together with nitrogen atoms. 21 and R 23 They can connect with each other and form 5- or 6-membered heterocyclic C atoms together with nitrogen atoms.

[0202] For R in the case of forming heterocyclic A 21 and R 22 As R 21 and R 22 The bonded divalent group -Q- indicates that the hydrogen atom can be substituted by an alkyl group with 1 to 6 carbon atoms, an aryl group with 6 to 10 carbon atoms, or an alkylene group with 1 to 10 carbon atoms that can have a substituent, or a hydrogen atom can be substituted by an alkyl group with 1 to 6 carbon atoms, an aryl group with 6 to 10 carbon atoms, or an alkylene group with 1 to 10 carbon atoms that can have a substituent.

[0203] For R in the case of forming heterocyclic B 22 and R 25 And R in the case of forming heterocyclic C 21 and R 23 As R 22 and R 25 The bonded divalent group -X 1 -Y 1 -and R 21 and R 23 The bonded divalent group -X 2 -Y 2 -(The side bonded to nitrogen is X) 1 and X 2 ), X 1 and X 2 Each is a group represented by the following formula (1x) or (2x), Y 1 and Y 2 Each is a group selected from any of the following formulas (1y) to (5y). In X 1 and X 2 When each of the groups is represented by the following formula (2x), Y 1 and Y 2 Each can be a single bond, and in this case, there can be oxygen atoms between carbon atoms.

[0204]

[0205] In formula (1x), each of the four Zs independently represents a hydrogen atom, a hydroxyl group, an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms, or -NR. 38 R 39 (R 38 and R 39 Each can independently represent an alkyl group having 1 to 20 hydrogen atoms. 31 ~R 36 Each independently represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 10 carbon atoms, R 37 It represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms.

[0206] R 27 R 28 R 29 R 31 ~R 37 R without the formation of heterocycles 21 ~R 23 and R 25 Each can bond with any of the others to form a 5-membered ring or a 6-membered ring, R 31 and R36 Direct bonding is possible, R 31 and R 37 They can be bonded directly.

[0207] R without the formation of heterocycles 21 and R 22 Each can independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms that may have substituents, an allyl group having 6 to 11 carbon atoms that may have substituents, or an aryl group having 6 to 11 carbon atoms that may have substituents. R in the case where a heterocycle is not formed. 23 and R 25 Each can be independently represented by a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms.

[0208] As for compound (I), from the viewpoint of being able to improve visible light transmittance, compounds represented by formula (I-1) are preferred, for example.

[0209]

[0210] The symbols in equation (I-1) are defined in the same way as the same symbols in equation (I), and the preferred methods are also the same.

[0211] In compound (I-1), as X 1 Preferred group (2x) is used as Y. 1 Preferably, a single bond or a group (1y). In this case, as R 31 ~R 36 Preferably, it is an alkyl group having 1 to 3 carbon atoms, and more preferably a hydrogen atom or a methyl group. It should be noted that, as -Y 1 -X 1 Specifically, examples include divalent organic groups represented by formulas (11-1) to (12-3).

[0212] -C(CH3)2-CH(CH3)-……(11-1)

[0213] -C(CH3)2-CH2-……(11-2)

[0214] -C(CH3)2-CH(C2H5)-……(11-3)

[0215] -C(CH3)2-C(CH3)(nC3H7)-……(11-4)

[0216] -C(CH3)2-CH2-CH2-……(12-1)

[0217] -C(CH3)2-CH2-CH(CH3)-……(12-2)

[0218] -C(CH3)2-CH(CH3)-CH2-……(12-3)

[0219] Furthermore, in compound (I-1), considering its solubility, heat resistance, and the steepness of the change near the boundary between the visible and near-infrared regions in the spectral transmittance curve, R... 21 More preferably, it is a group represented by formula (4-1) or formula (4-2).

[0220]

[0221] In equations (4-1) and (4-2), R 71 ~R 75 Independently representing an alkyl group having 1 to 4 carbon atoms, a hydrogen atom, a halogen atom, or a carbon atom.

[0222] In compound (I-1), from the viewpoint of improving visible light transmittance, especially the transmittance of light with wavelengths of 430 nm to 550 nm, R 24 Preferred is -NH-SO2-R 30 R will be present in compound (I-1). 24 -NH-SO2-R 30 The compound is shown in formula (I-12).

[0223]

[0224] R in compound (I-12) 23 and R 26 The atom is preferably a hydrogen atom, a halogen atom, or an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms, and more preferably all of them are hydrogen atoms.

[0225] In compound (I-12), from the viewpoint of lightfastness, R 30 Independently preferred are alkyl groups having 1 to 12 branched carbon atoms, alkoxy groups having 1 to 12 branched carbon atoms, or hydrocarbon groups having 6 to 16 carbon atoms with an unsaturated ring structure. Examples of unsaturated ring structures include: benzene, toluene, xylene, furan, benzofuran, etc. 30 More preferably, it is an alkyl group that may have a branched chain and a carbon number of 1 to 12, or an alkoxy group that may have a branched chain and a carbon number of 1 to 12. It should be noted that, in the representation of R... 30 In each of the groups, some or all of the hydrogen atoms can be replaced by halogen atoms, especially fluorine atoms.

[0226] Compound (I) can be manufactured, for example, by the known methods described in U.S. Patent No. 5,543,086, U.S. Patent Application Publication No. 2014 / 0061505, and International Publication No. 2014 / 088063.

[0227] The content of NIR pigment (A) in the resin film is preferably 0.1 to 15 parts by mass relative to 100 parts by mass of resin, and more preferably 1 to 10 parts by mass.

[0228] <Substrate Composition>

[0229] The substrate in this filter can be a single-layer structure or a multi-layer structure. Furthermore, the material used as the substrate can be any transparent material that transmits visible light in the range of 400nm to 700nm; it can be organic or inorganic, without any particular restrictions.

[0230] When the substrate has a single-layer structure, a resin substrate composed of a resin film containing resin, UV pigment (U) and NIR pigment (A) is preferred.

[0231] When the substrate has a multilayer structure, it is preferable to have a composite substrate containing a resin film comprising UV pigment (U) and NIR pigment (A) laminated on at least one main surface of the support. In this case, the support preferably comprises a transparent resin or a transparent inorganic material.

[0232] There are no restrictions on the type of resin used, as long as it is transparent. One or more transparent resins selected from polyester resins, acrylic resins, epoxy resins, olefin-thiol resins, polycarbonate resins, polyether resins, polyaryl ester resins, polysulfone resins, polyethersulfone resins, poly(p-phenylene) resins, polyaryl ether phosphine oxide resins, polyamide resins, polyimide resins, polyamide-imide resins, polyolefin resins, cycloolefin resins, polyurethane resins, and polystyrene resins can be used. These resins can be used alone or in combination of two or more.

[0233] From the viewpoints of the spectral characteristics, glass transition temperature (Tg), and adhesion of the resin film, it is preferable to select one or more resins selected from polyimide resin, polycarbonate resin, polyester resin, and acrylic resin.

[0234] UV pigments (U) and NIR pigments (A) can be contained in the same resin film or in different resin films.

[0235] As a transparent inorganic material, glass and crystalline materials are preferred.

[0236] Examples of glasses that can be used as supports include: absorbing glasses containing copper ions (near-infrared absorbing glasses) such as fluorophosphate glasses and phosphate glasses, soda-lime glass, borosilicate glass, alkali-free glass, and quartz glass.

[0237] From the viewpoint of being able to absorb infrared light (especially 1000nm to 1200nm), phosphate glasses and fluorophosphate glasses are preferred as glass. It should be noted that "phosphate glasses" also include silicate phosphate glasses in which a portion of the glass framework is composed of SiO2.

[0238] As a type of glass, chemically strengthened glass can also be used, which is obtained by replacing alkali metal ions with small ionic radii (e.g., Li ions, Na ions) present in the main surface of the glass plate with alkali metal ions with larger ionic radii (e.g., Na ions or K ions for Li ions, and K ions for Na ions) through ion exchange at a temperature below the glass transition temperature.

[0239] In addition, examples of crystalline materials that can be used as supports include birefringent crystals such as quartz, lithium niobate, and sapphire.

[0240] As a support, inorganic materials are preferred from the perspective of shape stability related to long-term reliability of optical and mechanical properties, and from the perspective of processability during filter manufacturing. Glass and sapphire are particularly preferred.

[0241] The resin film can be formed by dissolving or dispersing pigments (U) and (A), resin or resin raw material components, and other components as needed, in a solvent to prepare a coating solution, coating it onto a support and drying it, and further curing it as needed. The support can be the support included in this filter, or it can be a peelable support used only during the formation of the resin film. Furthermore, the solvent can be any dispersion medium that can stably disperse the resin or a solvent that can dissolve it.

[0242] Furthermore, to improve voids caused by microbubbles, depressions caused by the adhesion of foreign matter, and pinholes during the drying process, the coating liquid may contain surfactants. Additionally, methods such as dip coating, cast coating, or spin coating can be used when applying the coating liquid. The coating liquid is applied to a support and then dried to form a resin film. Furthermore, if the coating liquid contains transparent resin components, further curing treatments such as thermosetting or photocuring are performed.

[0243] Alternatively, resin films can also be formed into a film shape through extrusion molding. When the substrate is a single-layer structure (resin substrate) consisting of a resin film containing pigment (U) and pigment (A), the resin film can be used directly as the substrate. When the substrate is a multilayer structure (composite substrate) having a support and a resin film containing pigment (U) and pigment (A) laminated on at least one main surface of the support, the substrate can be manufactured by laminating the film onto the support and integrating it using methods such as hot pressing.

[0244] A filter may contain one layer of resin film or two or more layers of resin film. When there are two or more layers of resin film, each layer may have the same composition or different compositions.

[0245] When the substrate is a single-layer structure (resin substrate) consisting of a resin film containing pigment (U) and pigment (A), the thickness of the resin film is preferably 50 μm to 150 μm.

[0246] When the substrate is a multilayer structure (composite substrate) having a support and a resin film containing pigment (U) and pigment (A) laminated on at least one main surface of the support, the thickness of the resin film is preferably 0.3 μm to 20 μm.

[0247] There are no particular restrictions on the shape of the substrate; it can be in the form of blocks, plates, or films.

[0248] Furthermore, from the viewpoint of reducing warpage and lowering the height of optical elements when forming a dielectric multilayer film, the thickness of the substrate is preferably 300 μm or less. When the substrate is a resin substrate composed of a resin film, the thickness of the substrate is preferably 50 μm to 300 μm. When the substrate is a composite substrate having a support and a resin film, the thickness of the substrate is preferably 100 μm to 300 μm.

[0249] In this filter, other components may include, for example, inorganic particles that impart absorption by controlling the transmission and absorption of light within a specific wavelength range. Specific examples of inorganic particles include: ITO (indium tin oxide), ATO (antimony-doped tin oxide), cesium tungstate, and lanthanum boride. ITO particles and cesium tungstate particles have high visible light transmittance and exhibit light absorption over a wide range of infrared wavelengths greater than 1200 nm, thus enabling their use in applications requiring blocking of infrared light.

[0250] This filter, for example, when used in imaging devices such as digital cameras, can provide an imaging device with excellent color reproduction. An imaging device using this filter includes a solid-state imaging element, an imaging lens, and the filter itself. This filter can be used, for example, by being disposed between the imaging lens and the solid-state imaging element; or by being directly attached to the solid-state imaging element, imaging lens, etc., of the imaging device via an adhesive layer.

[0251] Example

[0252] The invention will now be described in more detail through examples.

[0253] A UV-Vis spectrophotometer (manufactured by Hitachi High Technology Co., Ltd., model UH-4150) was used to measure various spectral characteristics.

[0254] It should be noted that the spectral characteristics without a clearly stated incident angle are values ​​measured under the condition of an incident angle of 0 degrees (the direction perpendicular to the main surface of the filter).

[0255] The pigments used in each example are described below.

[0256] It should be noted that compounds 1-17 are UV pigments, and compounds 18-19 are NIR pigments.

[0257] Compound 1 (partial cyanide compound): synthesized with reference to Japanese Patent No. 6504176.

[0258] Compound 2: Nikkafluor U1 manufactured by Nippon Chemical Industries, Ltd.

[0259] Compound 3 (cyanin compound): SMP-416 manufactured by Hayashibara Chemical Co., Ltd.

[0260] Compound 4 (cyanin compound): SMP-370 manufactured by Hayashibara Chemical Co., Ltd.

[0261] Compound 5 (cyanin compound): SMP-471 manufactured by Hayashibara Chemical Co., Ltd.

[0262] Compound 6: Kayalight 408 manufactured by Nippon Kayaku Co., Ltd.

[0263] Compound 7: Kayalight B manufactured by Nippon Kayaku Co., Ltd.

[0264] Compound 8: Nikkafluor MCT manufactured by Nippon Chemical Industries, Ltd.

[0265] Compound 9 (a cyanin compound): synthesized with reference to Japanese Patent No. 6504176.

[0266] Compound 10 (partial cyanide compound): synthesized with reference to Japanese Patent No. 6504176.

[0267] Compound 11 (benzo[]) (azole compounds): UVITEX OB manufactured by Tokyo Chemical Co., Ltd.

[0268] Compound 12 (a cyanin compound): synthesized with reference to Japanese Patent No. 6504176.

[0269] Compound 13 (a cyanin compound): synthesized with reference to Japanese Patent No. 6504176.

[0270] Compound 14 (azo compound): synthesized with reference to Japanese Patent No. 6256335.

[0271] Compound 15 (a cyanin compound): synthesized with reference to Japanese Patent No. 6504176.

[0272] Compound 16 (triazine compound): synthesized with reference to Japanese Patent No. 6256335.

[0273] Compound 17 (a cyanin compound): synthesized with reference to Japanese Patent No. 6504176.

[0274] Compound 18: synthesized with reference to Japanese Patent No. 605169.

[0275] Compound 19: synthesized with reference to Japanese Patent No. 4800769.

[0276] Compound 1 Compound 9 Compound 10

[0277] Compound 11

[0278] Compound 12

[0279] Compound 13

[0280] Compound 14

[0281] Compound 15

[0282] Compound 16

[0283] Compound 17

[0284] Compound 18

[0285] Compound 19

[0286] <Examples 1-1 to 1-6: Spectral Characteristics of Dielectric Multilayer Films>

[0287] On a glass substrate (alkali glass, D263 manufactured by Schott), 42-layer dielectric multilayer films 1 to 6 were manufactured by alternately laminating TiO2 films and SiO2 films by vapor deposition. The refractive index of the SiO2 film was 1.47, and the refractive index of the TiO2 film was 2.39. In addition, the thickness ratio of the SiO2 film / TiO2 film was set within the range of 0.9 to 1.1. In addition, the film thicknesses of each multilayer film are shown in the following table.

[0288] The spectral characteristics at incident angles of 0 degrees and 40 degrees are shown in the following table.

[0289] It should be noted that Examples 1-1 to 1-6 are reference examples.

[0290]

[0291] <Spectral Characteristics of UV Pigments in Dichloromethane>

[0292] Each pigment was uniformly dissolved in dichloromethane. For each of the obtained solutions, the maximum absorption wavelength, the wavelength UV50 at which the transmittance was 50% within the wavelength range of 350 nm to 450 nm, the wavelength UV10 at which the transmittance was 10% within the wavelength range of 350 nm to 450 nm, and the absolute value of the difference between the wavelength UV50 at which the transmittance was 50% and the wavelength UV10 (UV50 - UV10) were measured using a spectrophotometer.

[0293] The results are shown in the following table.

[0294] Table 5

[0295] Maximum absorption wavelength (nm) UV50 (nm) UV50-UV10 (nm) Compound 1 414 429 15 Compound 2 362 398 36 Compound 3 406 419 13 Compound 4 406 419 13 Compound 5 393 406 13 Compound 6 366 410 44 Compound 7 376 402 26 Compound 8 376 402 26 Compound 9 391 407 16 Compound 10 379 395 16 Compound 11 377 410 33 Compound 12 399 414 15 Compound 13 397 412 15 Compound 14 376 406 30 Compound 15 390 404 14 Compound 16 350 375 25 Compound 17 381 395 14

[0296] <Example 2-1: Spectral Characteristics of Resin Film>

[0297] The above substances were mixed at a concentration of 2 parts by mass of Compound 1, 3.3 parts by mass of Compound 12, and 4 parts by mass of Compound 18 with respect to 100 parts by mass of a polyimide resin (C-3G30G manufactured by Mitsubishi Gas Chemical Company, Inc.). An organic solvent (a mixed solvent of γ-butyrolactone and cyclohexanone) was added, and the mixture was stirred for 2 hours while heating at 50°C. The resin solution containing the pigment was coated on a glass substrate (alkali glass, D263 manufactured by Schott) and dried to obtain a resin film 1 with a film thickness of 2 μm.

[0298] <Examples 2-2~2-5>

[0299] Except for setting the types and amounts of pigments as shown in the table below, the same procedure as in Example 2-1 was followed to obtain resin films 2 to 5 respectively.

[0300] The internal spectral transmittance curve was calculated using the spectral transmittance and spectral reflectance curves of the glass substrate with the resin film.

[0301] The spectral characteristics are shown in the table below.

[0302] It should be noted that Examples 2-1 to 2-5 are for reference only.

[0303] Table 6

[0304]

[0305] <Spectral characteristics of filters>

[0306] <Example 3-1>

[0307] Multilayer films 4 as in Examples 1-4 were formed on a glass substrate (alkali glass, D263 manufactured by Schott). Resin layer 1 as in Example 2-1 was then spin-coated onto multilayer film 4. A seven-layer antireflective film comprising silicon dioxide / titanium dioxide was then formed on resin layer 1, thereby fabricating an absorption-type infrared cutoff filter. For the obtained infrared cutoff filter, the transmission spectra at 0° and 40° incident directions within the wavelength range of 350 nm to 1200 nm were measured using a spectrophotometer. The results are shown in the table below. Additionally, the spectral transmittance curves are shown in... Figure 5 middle.

[0308] <Example 3-2 to Example 3-7, Example 3-9 to Example 3-12>

[0309] Except that the types of multilayer film and resin film were set to the combinations listed in the table below, an infrared cutoff filter was fabricated using the same method as in Example 3-1, and the transmission spectrum was measured.

[0310] The results are shown in the table below.

[0311] <Example 3-8>

[0312] Except for changing the support used from an alkaline glass substrate to a fluorophosphate glass substrate (NF50T manufactured by AGC Corporation, with a thickness of 0.2 mm), an infrared cutoff filter was fabricated using the same method as in Example 3-1, and the transmission spectrum was measured.

[0313] The results are shown in the table below.

[0314] Examples 3-1 to 3-3, 3-8 and 3-9 are examples, and examples 3-4 to 3-7 and 3-10 to 3-12 are comparative examples.

[0315] UV20 offset: UV20 (0度) With UV20 (40度) The absolute value of the difference

[0316] UV40 offset: UV40 (0度) With UV40 (40度) The absolute value of the difference

[0317] UV50 offset: UV50 (0度) and UV50 (40度) The absolute value of the difference

[0318] IR20 offset: IR20 (0度) With IR20 (40度) The absolute value of the difference

[0319] Table 7

[0320]

[0321] The results above show that the filters of Examples 3-1 to 3-3, 3-8, and 3-9 effectively blocked light in the near-infrared region, particularly in the range of 1000 nm to 1200 nm, and exhibited excellent transmittance in the visible light region of 440 nm to 600 nm. Example 3-8, due to the absorptive properties of the glass substrate itself, further blocked light in the range of 1000 nm to 1200 nm compared to Example 3-1.

[0322] On the other hand, the filters of Examples 3-4, which used resin films 3 with high average internal transmittance in the range of 400nm to 420nm, yielded results with large UV20 offset and low oblique incidence characteristics.

[0323] In addition, in the filters of Examples 3-5 and 3-7, which utilize the absorption capacity of pigments contained in the resin film to block light in the range of 1000nm to 1200nm, the visible light region of 440nm to 600nm is also absorbed, resulting in low transmittance.

[0324] Furthermore, filters using multilayer films 1, 2, or 3 of examples 3-6, 3-7, and 3-10 to 3-12, which have a UV50 of less than 420 nm (i.e., the light blocking region is not extended to a longer wavelength) and low light blocking performance in the range of 1000 nm to 1200 nm, yielded results with low light blocking performance in the range of 1000 nm to 1200 nm.

[0325] The present invention has been described in detail with reference to specific embodiments; however, various changes or modifications may be made without departing from the spirit and scope of the invention, as will be apparent to those skilled in the art. This application is based on Japanese Patent Application No. 2020-158813, filed on September 23, 2020, the contents of which are incorporated herein by reference.

[0326] Industrial practicality

[0327] The filter of this invention has high visible light transmittance, high light blocking performance in the wavelength range of 1000nm to 1200nm, and excellent near-infrared light blocking characteristics that suppress the reduction of blocking performance for ultraviolet and near-infrared light at high incident angles. It is useful in applications where high performance is increasingly being developed, such as in information acquisition devices like cameras and sensors for transport aircraft.

[0328] Label Explanation

[0329] 1A, 1B, 1C, 1D... Filters, 10... Substrate, 11... Support, 12... Resin film, 30... Dielectric multilayer film

Claims

1. An optical filter having a substrate and a dielectric multilayer film laminated on at least one main surface side of the substrate and as an outermost layer, wherein the substrate has a resin film containing a pigment (U), a pigment (A) and a resin, the pigment (U) has a maximum absorption wavelength in the range of 380 nm to 425 nm in dichloromethane, the pigment (A) has a maximum absorption wavelength in the range of 690 nm to 730 nm in dichloromethane, and the optical filter satisfies all of the following spectral properties (i-1) to (i-8): (i-1) internal transmittance at a wavelength of 400 nm in a spectral transmittance curve is 2% or less; (i-2) internal transmittance at a wavelength of 550 nm is 90% or more; (i-3) internal transmittance at a wavelength of 700 nm is 70% or more; (i-4) internal transmittance at a wavelength of 400 nm is 2% or less; (i-5) internal transmittance at a wavelength of 550 nm is 90% or more; (i-6) internal transmittance at a wavelength of 700 nm is 70% or more; (i-7) internal transmittance at a wavelength of 400 nm is 2% or less; and (i-8) internal transmittance at a wavelength of 700 nm is 70% or more, at this time, (i-9) the optical filter further satisfies the following spectral property: (i-9) internal transmittance at a wavelength of 550 nm is 90% or more, at this time, the dielectric multilayer film satisfies all of the following spectral properties (iv-1) to (iv-8): (iv-1) internal transmittance at a wavelength of 400 nm in a spectral transmittance curve is 2% or less; (iv-2) internal transmittance at a wavelength of 550 nm is 90% or more; (iv-3) internal transmittance at a wavelength of 700 nm is 70% or more; (iv-4) internal transmittance at a wavelength of 400 nm is 2% or less; (iv-5) internal transmittance at a wavelength of 550 nm is 90% or more; (iv-6) internal transmittance at a wavelength of 700 nm is 70% or more; (iv-7) internal transmittance at a wavelength of 400 nm is 2% or less; and (iv-8) internal transmittance at a wavelength of 700 nm is 70% or more, at this time, the resin film satisfies all of the following spectral properties (iii-1) to (iii-6): (iii-1) internal transmittance at a wavelength of 400 nm in a spectral transmittance curve is 2% or less; (iii-2) internal transmittance at a wavelength of 550 nm is 90% or more; (iii-3) wavelength at which internal transmittance is 50% (UV50) is in the range of 415 nm to 440 nm; (iii-4) in the range of a wavelength of 400 nm to 430 nm, wavelength at which internal transmittance is 10% (UV10) and wavelength at which internal transmittance is 50% (UV50) are set, at this time, the absolute value of the difference between UV10 and UV50 is 15 nm or less; and (iii-6) wavelength at which internal transmittance is 20% (IR20) is in the range of 650 nm to 700 nm, at this time, the resin film further satisfies the following spectral properties (iii-7) to (iii-8): (iii-7) internal transmittance at a wavelength of 550 nm is 90% or more; and (iii-8) internal transmittance at a wavelength of 700 nm is 70% or more, the pigment (U) contains a compound represented by the following formula (M), the symbol in formula (M) is as described below, the pigment (U) contains the following compound: the pigment (U) contains the following two compounds: the Y in formula (M) is an oxygen atom and the X is a divalent group represented by formula (X1). the pigment (U) contains the following three compounds: the Y in formula (M) is an oxygen atom and the X is a divalent group represented by formula (X1), and the substrate contains a support and the resin film is laminated on at least one main surface of the support, and the support contains phosphate glass or fluorophosphate glass. the resin is a transparent resin. ​ ​ ​ (i-1) In the spectral transmittance curve at an angle of incidence of 0 degrees, the average transmittance T in the range of wavelengths from 1000 nm to 1200 nm is 1000-1200(0度)AVE 1.5% or less; (i-2) In the spectral transmittance curve at an incident angle of 40 degrees, the average transmittance T in the range of wavelengths from 1000 nm to 1200 nm is 1000-1200(40度)AVE 10% or less; (i-3) In the spectral transmittance curve at an incident angle of 0 degree, the average transmittance T in the range of wavelengths from 440 nm to 600 nm is 90% or more 440-600(0度)AVE is 90% or more; (i-4) the average transmittance T in the range of wavelengths from 440 nm to 600 nm in the spectral transmittance curve at an angle of incidence of 40 degrees 440-600(40度)AVE is 83% or more; (i-5) wavelength at which the transmittance is 50% at an incidence angle of 0 degrees UV50 (0 in the range of 420 nm to 435 nm (in degrees). (i-6) wavelength at which the transmittance is 20% when the incident angle is 0 degrees in the range of wavelengths from 350 nm to 450 nm is set as UV20 (0 (i-7) wavelength at which the transmittance is 40% when the incident angle is 0 degrees in the range of wavelengths from 350 nm to 450 nm is set as UV40 (0 (i-8) wavelength at which the transmittance is 50% when the incident angle is 0 degrees in the range of wavelengths from 350 nm to 450 nm is set as UV50 (0 (i-9) wavelength at which the transmittance is 60% when the incident angle is 0 degrees in the range of wavelengths from 350 nm to 450 nm is set as UV60 The wavelength at which the transmittance is 20% in the range of wavelengths from 350 nm to 450 nm at an incident angle of 40 degrees is set as UV20 (40 The wavelength at which the transmittance is 40% is set as UV40 (40 The wavelength at which the transmittance is 50% is set as UV50 (40 degrees), ​ UV20 (0 (degree) and UV20 (40 The absolute value of the difference (degree) is less than 12nm. UV40 (0 the absolute value of the difference between the wavelength of the peak of the emission spectrum of the light emitted by the light source (in nm) and the wavelength of the peak of the emission spectrum of the light emitted by the UV40 (40 is 12 nm or less UV50 (0 The absolute value of the difference between the UV50 (40 The absolute value of the difference between the UV50 (°) and the UV50 (°) is 12 nm or less. (i-7) wavelength at which the transmittance is 20% in the range of wavelengths from 640 nm to 700 nm is set to IR20 under the condition that the incident angle is 0 degree (0 degrees), IR20: wavelength at which the transmittance is 20% in the range of wavelengths from 640 nm to 700 nm at an incident angle of 40 degrees (40 degrees), ​ IR20 (0 The absolute value of the difference between the peak wavelength of the light emitted by the IR20 (40 The absolute value of the difference between the peak wavelength of the light emitted by the IR20 (40 The absolute value of the difference between the peak wavelength (i-8) wavelength IR20 at a transmittance of 20% at an incident angle of 0 degrees (0 in the range of 640 nm to 700 nm.

2. The filter of claim 1, wherein, ​ (i-9) The wavelength at which the transmittance is 10% in the range of wavelengths from 350 nm to 450 nm under the condition that the incident angle is 0 degree is set as UV10 (0 (i-8) The wavelength at which the transmittance is 50% in the range of wavelengths from 350 nm to 450 nm under the condition that the incident angle is 0 degree is set as UV50 (0 (i-8) The wavelength at which the transmittance is 50% in the range of wavelengths from 350 nm to 450 nm under the condition that the incident angle is 0 degree is set as UV50 UV10 (0 The absolute value of the difference between UV50 (0 The absolute value of the difference between UV50 and UV10 is 15 nm or less.

3. The filter according to claim 1 or 2, wherein ​ (iv-1) wavelength at which the transmittance is 50% at an angle of incidence of 0 degrees UV50 (0 in the range of 420 nm to 430 nm (in degrees). (iv-2) the average transmittance T in the range of wavelengths from 440 nm to 600 nm in the spectral transmittance curve at an angle of incidence of 0 degrees 440-600(0度)AVE is 90% or more; (iv-3) the minimum transmission T in the range of wavelengths from 440 nm to 600 nm in the spectral transmission curve at an angle of incidence of 0 degrees 440-600(0度)MIN is 90% or more; (iv-4) the average transmittance T in the range of wavelengths from 440 nm to 600 nm in the spectral transmittance curve at an angle of incidence of 40 degrees 440-600(40度)AVE is 90% or more; (iv-5) the minimum transmittance T in the range of wavelengths from 440 nm to 600 nm in the spectral transmittance curve at an angle of incidence of 40 degrees 440-600(40度)MIN is 80% or more; (iv-6) wavelength at which the transmittance is 20% at an incidence angle of 0 degrees IR20 (0 in the range of 680 nm to 740 nm (in degrees). (iv-7) in the spectral transmittance curve at an angle of incidence of 0 degrees, the average transmittance T in the range of wavelengths from 1000 nm to 1200 nm is greater than 70% and less than 90% 1000-1200(0度)AVE is 1.5% or less; (i-8) In the spectral transmittance curve at an incident angle of 40 degrees, the average transmittance T in the range of wavelengths from 1000 nm to 1200 nm is 80% or more 1000-1200(40度)AVE is 10% or less.

4. The optical filter of any one of claims 1-3, wherein, ​ ​ (iii-2) the average internal transmission T in the range of wavelengths 400 nm to 420 nm in the spectral transmission curve 400-420AVE is 5% or less; ​ ​ ​ (iii-5) the average internal transmission T in the range of wavelengths 440 nm to 550 nm in the spectral transmission curve 440-550AVE is 93% or more; ​ 5. The optical filter of any one of claims 1-4, wherein, ​ (iii-7) the average internal transmission T in the range of wavelengths 350 nm to 390 nm in the spectral transmission curve 350-390AVE is 10% or less; (iii-8) Average internal transmission T in the range of wavelengths 400 nm to 430 nm in the spectral transmission curve 400-430AVE is 15% or less.

6. The optical filter of any one of claims 1-5, wherein, ​ ​ R 1 represents a monovalent hydrocarbon group having 1 to 12 carbon atoms which can have a substituent; R 2 ~R 5 each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms; Y represents a methylene group substituted by R 6 and R 7 a methylene group substituted by R or an oxygen atom; R 6 and R 7 each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms; X represents any one of divalent groups represented by the following formulae (X1) to (X5), wherein, R 8 and R 9 each independently represents a monovalent hydrocarbon group having 1 to 12 carbon atoms which can have a substituent; R 10 ~R 19 each independently represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 12 carbon atoms which can have a substituent, 7. The filter of claim 6, wherein, ​ said Y in said formula (M) is said methylene substituted by R 6 and R 7 and said X is a divalent radical represented by said formula (X1).

8. The filter of claim 6, wherein, ​ said Y in said formula (M) is said methylene substituted by R 6 and R 7 and said X is a divalent radical represented by said formula (X1), and ​ 9. The filter of claim 6, wherein, ​ said Y in said formula (M) is said methine group substituted by R 6 and R 7 and said X is a divalent radical represented by said formula (X1), ​ said Y in said formula (M) is said methylene substituted by R 6 and R 7 and said X is a divalent radical represented by said formula (X2).

10. The optical filter of any one of claims 1-9, wherein, The pigment (A) comprises squarine Salt pigments.

11. The optical filter of any one of claims 1-10, wherein, ​ 12. The filter according to any one of claims 1 to 11, wherein ​

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