Optical filter

Abstract

To provide an optical filter that selectively transmits light in an RGB band and exhibits a small change in light amount in the RGB band depending on an incident angle.SOLUTION: The present invention relates to an optical filter including a base material and a dielectric multilayer film laminated as the outermost layer on at least one main surface side of the base material, the base material including a resin layer containing a resin and a dye A having an absorption maximum wavelength in a range of 400 nm or more and less than 700 nm, the optical filter having maximum values in a wavelength range of 430 nm or more and less than 490 nm, a wavelength range of 490 nm or more and less than 590 nm, and a wavelength range of 590 nm or more and less than 650 nm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to optical filters. [Background technology]

[0002] In order to reproduce color tones well and obtain clear images, imaging devices using solid-state imaging elements use optical filters that transmit light in the visible band (visible light) and block light in the near-infrared range (near-infrared light). As an optical filter, for example, a near-infrared light cut filter is known, which has a base material containing a dye and a resin and a dielectric multilayer film provided on a glass substrate.

[0003] From the viewpoint of suppressing flare and ghost phenomena, the dye used in the optical filter is preferably a near-infrared absorbing dye that has excellent light-blocking properties against near-infrared light. In recent years, there has been a demand for optical filters that selectively transmit light in multiple bands (for example, RGB bands (red band, green band, blue band)).

[0004] As an optical filter that selectively transmits light in multiple bands, for example, Patent Document 1 discloses an optical filter that includes a laminated film having 30 or more layers, each having at least a layer made of resin A (layer A) and a layer made of resin B (layer B), and that has an average reflectance of 60% or more in the near-infrared band having a wavelength of 850 to 1000 nm, and that satisfies the following formulas a and b:

[0005] T(630nm)-T(595nm)≧20% Formula a T(370nm)≦5% Formula b Where T(xnm): transmittance at wavelength xnm [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2006-126315 Summary of the Invention [Problem to be solved by the invention]

[0007] However, according to the investigations of the present inventors, although the optical filter described in Patent Document 1 transmits light in a plurality of bands, it has little selectivity for light in the RGB bands, and there is room for improvement.

[0008] The present invention has been made in consideration of the above-described conventional situation, and an object to be achieved is to provide an optical filter that selectively transmits light in the RGB bands and that exhibits little change in the amount of light in the RGB bands depending on the angle of incidence. [Means for solving the problem]

[0009] An optical filter according to one aspect of the present invention is as follows. An optical filter comprising a substrate and a dielectric multilayer film laminated as an outermost layer on at least one main surface side of the substrate, the substrate has a resin layer containing a resin and a dye A, the dye A has a maximum absorption wavelength in the wavelength range of 400 nm or more and less than 700 nm in a spectral transmittance curve of a coating film formed by dissolving the dye A in the resin and coating the coating film on a glass substrate, An optical filter that satisfies all of the following (i-1) to (i-9). (i-1) In the spectral transmittance curve at an incident angle of 0°, Maximum value 1 in the wavelength range of 430 nm to 490 nm (0deg) and Maximum value 2 in the wavelength range of 490 nm to 590 nm (0deg) and Maximum value 3 in the wavelength range of 590 nm to 650 nm (0deg) It has. (i-2) In the spectral transmittance curve at an incident angle of 30°, Maximum value 1 in the wavelength range of 430 nm to 490 nm (30deg) and Maximum value 2 in the wavelength range of 490 nm to 590 nm (30deg) and Maximum value 3 in the wavelength range of 590 nm to 650 nm(30deg) It has. (i-3) In the spectral transmittance curve at an incident angle of 0°, there is a minimum value 1 in the wavelength range of 440 nm or more and less than 550 nm. (0deg) Or has a wavelength range in which the transmittance is 1% or less, Minimum value 2 in the wavelength range of 490 nm to 610 nm (0deg) Or, it has a wavelength range in which the transmittance is 1% or less. (i-4) In the spectral transmittance curve at an incident angle of 30°, there is a minimum value 1 in the wavelength range of 440 nm or more and less than 550 nm. (30deg) Or has a wavelength range in which the transmittance is 1% or less, Minimum value 2 in the wavelength range of 490 nm to 610 nm (30deg) Or, it has a wavelength range in which the transmittance is 1% or less. (i-5) All of the following formulas are satisfied. Maximum 1 (0deg) -Minimum 1 (0deg) ≧30% Maximum 2 (0deg) -Minimum 1 (0deg) ≧30% Maximum 2 (0deg) -Minimum 2 (0deg) ≧30% Maximum 3 (0deg) -Minimum 2 (0deg) ≧27% (i-6) All of the following equations are satisfied. Maximum 1 (30deg) -Minimum 1 (30deg) ≧30% Maximum 2 (30deg) -Minimum 1 (30deg) ≧30% Maximum 2 (30deg) -Minimum 2 (30deg) ≧30% Maximum 3 (30deg) -Minimum 2 (30deg) ≧27% (i-7) In the spectral transmittance curve at an incident angle of 0°, Average transmittance in the wavelength range of 700 to 1000 nm (0deg) is less than 5%. (i-8) In the spectral transmittance curve at an incident angle of 30°, Average transmittance in the wavelength range of 700 to 1000 nm(30deg) is less than 5%. (i-9) All of the following equations are satisfied. 0.85≦maximum value 1 (30deg) / Maximum 1 (0deg) ≦1.12 0.85≦maximum value 2 (30deg) / Maximum 2 (0deg) ≦1.12 0.85≦maximum value 3 (30deg) / Maximum 3 (0deg) ≦1.12 [Effects of the Invention]

[0010] The optical filter of the present invention selectively transmits light in the RGB bands, and the amount of light in the RGB bands changes little depending on the angle of incidence. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view schematically illustrating an example of an optical filter according to an embodiment. [Figure 2] FIG. 2 is a diagram showing the spectral transmittance curve of the coating film of Test Example 4-2. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described. In this specification, the near-infrared absorbing dye may be abbreviated as "NIR dye" and the ultraviolet absorbing dye may be abbreviated as "UV dye". In this specification, a compound represented by formula (1) is also referred to as compound (1). The same applies to compounds represented by other formulas. Furthermore, a group represented by formula (1) is also referred to as group (1), and the same applies to groups represented by other formulas.

[0013] In this specification, the term "internal transmittance" refers to the transmittance obtained by subtracting the influence of interface reflection from the measured transmittance, as expressed by the formula {measured transmittance / (100-reflectance)}×100. In this specification, the transmittance of the substrate or resin layer is always the "internal transmittance" even when it is referred to as "transmittance." On the other hand, the transmittance measured by dissolving a dye in a solvent such as dichloromethane and the transmittance of an optical filter are actually measured transmittances.

[0014] In this specification, for example, a transmittance of 90% or more in a specific wavelength range means that the transmittance is not less than 90% across the entire wavelength range, i.e., the minimum transmittance is 90% or more across the wavelength range. Similarly, for example, a transmittance of 1% or less in a specific wavelength range means that the transmittance is not more than 1% across the entire wavelength range, i.e., the maximum transmittance is 1% or less across the wavelength range. The same applies to internal transmittance. The average transmittance and average internal transmittance in a specific wavelength range are the arithmetic means of the transmittance and internal transmittance per 1 nm in the wavelength range. In this specification, the use of "to" to indicate a range of values ​​includes the upper and lower limits.

[0015] [Optical filter] 1, an optical filter 10 according to one embodiment of the present invention includes a substrate 11 and a dielectric multilayer film 12 laminated as an outermost layer on at least one main surface of the substrate 11. The substrate has a resin layer containing a resin and a dye A. Hereinafter, the optical filter according to one embodiment of the present invention may be referred to as "this filter."

[0016] This filter satisfies all of the following (i-1) to (i-9). (i-1) In the spectral transmittance curve at an incident angle of 0°, Maximum value 1 in the wavelength range of 430 nm to 490 nm (0deg) and Maximum value 2 in the wavelength range of 490 nm to 590 nm (0deg) and Maximum value 3 in the wavelength range of 590 nm to 650 nm (0deg) It has. (i-2) In the spectral transmittance curve at an incident angle of 30°, Maximum value 1 in the wavelength range of 430 nm to 490 nm (30deg) and Maximum value 2 in the wavelength range of 490 nm to 590 nm (30deg) and Maximum value 3 in the wavelength range of 590 nm to 650 nm (30deg) It has. (i-3) In the spectral transmittance curve at an incident angle of 0°, there is a minimum value 1 in the wavelength range of 440 nm or more and less than 550 nm. (0deg) Or has a wavelength range in which the transmittance is 1% or less, Minimum value 2 in the wavelength range of 490 nm to 610 nm (0deg) Or, it has a wavelength range in which the transmittance is 1% or less. (i-4) In the spectral transmittance curve at an incident angle of 30°, there is a minimum value 1 in the wavelength range of 440 nm or more and less than 550 nm. (30deg) Or has a wavelength range in which the transmittance is 1% or less, Minimum value 2 in the wavelength range of 490 nm to 610 nm (30deg) Or, it has a wavelength range in which the transmittance is 1% or less. (i-5) All of the following formulas are satisfied. Maximum 1 (0deg) -Minimum 1 (0deg) ≧30% Maximum 2 (0deg) -Minimum 1 (0deg) ≧30% Maximum 2 (0deg) -Minimum 2 (0deg) ≧30% Maximum 3 (0deg) -Minimum 2 (0deg) ≧27% (i-6) All of the following equations are satisfied. Maximum 1 (30deg) -Minimum 1 (30deg) ≧30% Maximum 2 (30deg) -Minimum 1 (30deg) ≧30% Maximum 2 (30deg) -Minimum 2 (30deg) ≧30% Maximum 3 (30deg) -Minimum 2 (30deg) ≧27% (i-7) In the spectral transmittance curve at an incident angle of 0°, Average transmittance in the wavelength range of 700 to 1000 nm (0deg)is less than 5%. (i-8) In the spectral transmittance curve at an incident angle of 30°, Average transmittance in the wavelength range of 700 to 1000 nm (30deg) is less than 5%. (i-9) All of the following equations are satisfied. 0.85≦maximum value 1 (30deg) / Maximum 1 (0deg) ≦1.12 0.85≦maximum value 2 (30deg) / Maximum 2 (0deg) ≦1.12 0.85≦maximum value 3 (30deg) / Maximum 3 (0deg) ≦1.12

[0017] By satisfying the above (i-1) to (i-6), this filter can selectively transmit light in the RGB bands.

[0018] In (i-1), Maximum 1 (0deg) The wavelength range is preferably 430 nm or more and less than 480 nm, and more preferably 430 nm or more and less than 455 nm. Maximum 2 (0deg) The wavelength range is preferably 490 nm or more and less than 550 nm, more preferably 500 nm or more and less than 540 nm. Maximum 3 (0deg) The wavelength range is preferably 590 nm or more and less than 640 nm, more preferably 590 nm or more and less than 630 nm.

[0019] In (i-2), Maximum 1 (30deg) The wavelength range is preferably 430 nm or more and less than 480 nm, and more preferably 430 nm or more and less than 455 nm. Maximum 2 (30deg) The wavelength range is preferably 490 nm or more and less than 550 nm, more preferably 500 nm or more and less than 540 nm. Maximum 3 (30deg) The wavelength range is preferably 590 nm or more and less than 640 nm, more preferably 590 nm or more and less than 630 nm.

[0020] In (i-3), Minimum 1 (0deg) The wavelength range in which the transmittance is 1% or less is preferably 450 nm or more and less than 540 nm, and more preferably 460 nm or more and less than 530 nm. Minimum 2 (0deg) The wavelength range in which the transmittance is 1% or less is preferably 500 nm or more and less than 600 nm, and more preferably 510 nm or more and less than 590 nm.

[0021] In (i-4), Minimum 1 (30deg) The wavelength range in which the transmittance is 1% or less is preferably 400 nm or more and less than 430 nm, and more preferably 410 nm or more and less than 420 nm. Minimum 2 (30deg) The wavelength range in which the transmittance is 1% or less is preferably 450 nm or more and less than 530 nm, and more preferably 460 nm or more and less than 520 nm.

[0022] In (i-5), Maximum 1 (0deg) -Minimum 1 (0deg) is preferably 35% or more, more preferably 40% or more. Maximum 2 (0deg) -Minimum 1 (0deg) is preferably 32% or more, more preferably 35% or more. Maximum 2 (0deg) -Minimum 2 (0deg) is preferably 32% or more, more preferably 35% or more. Maximum 3 (0deg) -Minimum 2 (0deg) is preferably 30% or more, more preferably 35% or more.

[0023] In (i-6), Maximum 1 (30deg) -Minimum 1 (30deg) is preferably 35% or more, more preferably 40% or more. Maximum 2 (30deg) -Minimum 1(30deg) is preferably 32% or more, more preferably 35% or more. Maximum 2 (30deg) -Minimum 2 (30deg) is preferably 32% or more, more preferably 35% or more. Maximum 3 (30deg) -Minimum 2 (30deg) is preferably 30% or more, more preferably 35% or more.

[0024] By satisfying the above (i-7) to (i-8), the present filter has excellent near-infrared light blocking properties.

[0025] In (i-7), average transmittance (0deg) is preferably 2% or less, more preferably 0.5% or less, and further preferably 0.2% or less.

[0026] In (i-8), average transmittance (30deg) is preferably 1% or less, more preferably 0.5% or less, and even more preferably 0.2% or less.

[0027] By satisfying the above (i-9), this filter reduces the change in the amount of light in the RGB bands due to the angle of incidence.

[0028] In (i-9), Maximum 1 (30deg) / Maximum 1 (0deg) is preferably 0.9 or more and 1.12 or less, more preferably 0.95 or more and 1.05 or less. Maximum 2 (30deg) / Maximum 2 (0deg) is preferably 0.9 or more and 1.12 or less, more preferably 0.95 or more and 1.05 or less. Maximum 3 (30deg) / Maximum 3 (0deg) is preferably 0.9 or more and 1.12 or less, more preferably 0.95 or more and 1.05 or less.

[0029] Furthermore, it is preferable that the present filter satisfies all of the following formulas: |Wavelength λ1 (0deg) -wavelength λ1 (30deg) |≦10nm |Wavelength λ2 (0deg) -wavelength λ2 (30deg) |≦10nm |Wavelength λ3 (0deg) -wavelength λ3 (30deg) |≦10nm |Wavelength λ4 (0deg) -wavelength λ4 (30deg) |≦10nm

[0030] <In the formula, wavelength λ1 (0deg) , wavelength λ1 (30deg) , wavelength λ2 (0deg) , wavelength λ2 (30deg) , wavelength λ3 (0deg) , wavelength λ3 (30deg) , wavelength λ4 (0deg) , wavelength λ4 (30deg) is a value calculated by the following formula: Wavelength λ1 (0deg) ={Maximum 1 (0deg) Wavelength at + minimum 1 (0deg) wavelength in {÷2 Wavelength λ1 (30deg) ={Maximum 1 (30deg) Wavelength at + minimum 1 (30deg) wavelength in {÷2 Wavelength λ2 (0deg) ={Maximum 2 (0deg) Wavelength at + minimum 1 (0deg) wavelength in {÷2 Wavelength λ2 (30deg) ={Maximum 2 (30deg) Wavelength at + minimum 1 (30deg) wavelength in {÷2 wavelength λ3 (0deg) ={Maximum 2 (0deg) Wavelength at + minimum value 2 (0deg) wavelength in {÷2 wavelength λ3 (30deg) ={Maximum 2 (30deg) Wavelength at + minimum value 2 (30deg) wavelength in {÷2 Wavelength λ4 (0deg) ={Maximum 3 (0deg) Wavelength at + minimum value 2 (0deg) wavelength in {÷2 Wavelength λ4 (30deg) ={Maximum 3 (30deg) Wavelength at + minimum value 2 (30deg) wavelength at {÷2>

[0031] By satisfying the above formula, this filter reduces the change in the amount of light in the RGB bands due to the angle of incidence.

[0032] |Wavelength λ1 (0deg) -wavelength λ1 (30deg) is preferably 5 nm or less, more preferably 3 nm or less. |Wavelength λ2 (0deg) -wavelength λ2 (30deg) is preferably 5 nm or less, more preferably 3 nm or less. |Wavelength λ3 (0deg) -wavelength λ3 (30deg) is preferably 5 nm or less, more preferably 3 nm or less. |Wavelength λ4 (0deg) -wavelength λ4 (30deg) is preferably 5 nm or less, more preferably 3 nm or less.

[0033] Furthermore, when the resin layer in the present filter contains the below-described dye 1, the below-described dye 2, the below-described dye 3, the below-described dye 4, and a resin, the present filter preferably satisfies all of the following (iv-1) to (iv-4):

[0034] (iv-1) In the spectral transmittance curve of a coating film obtained by dissolving the dye 1 in the resin and coating it on a glass substrate so that the internal transmittance at the absorption maximum wavelength is 10%, IR80a is the longest wavelength in the wavelength range of 395 nm to 450 nm at which the internal transmittance is 80%. (色素1) year, The wavelength at which the internal transmittance is 10% is called IR10 (色素1) When this is done, the following equation is satisfied: IR80a (色素1) -IR10 (色素1) ≦25nm (iv-2) In the spectral transmittance curve of a coating film obtained by dissolving the dye 2 in the resin and coating it on a glass substrate so that the internal transmittance at the absorption maximum wavelength is 10%, IR80a is the longest wavelength in the wavelength range of 450nm or more and less than 540nm at which the internal transmittance is 80%. (色素2) year, The shortest wavelength at which internal transmittance is 80% is IR80b (色素2) year, The wavelength at which the internal transmittance is 10% is called IR10 (色素2) When this is done, the following equation is satisfied: IR80a (色素2) -IR10 (色素2) ≦35nm IR80b (色素2) -IR10 (色素2) ≦55nm (iv-3) In the spectral transmittance curve of a coating film obtained by dissolving the dye 3 in the resin and coating it on a glass substrate so that the internal transmittance at the absorption maximum wavelength is 10%, IR80a is the longest wavelength in the wavelength range of 540nm to 600nm at which the internal transmittance is 80%. (色素3) year, The shortest wavelength at which internal transmittance is 80% is IR80b (色素3) year, The wavelength at which the internal transmittance is 10% is called IR10 (色素3) When this is done, the following equation is satisfied: IR80a (色素3) -IR10 (色素3) ≦35nm IR80b (色素3) -IR10 (色素3) ≦55nm (iv-4) In the spectral transmittance curve of a coating film obtained by dissolving the dye 4 in the resin and coating it on a glass substrate so that the internal transmittance at the absorption maximum wavelength is 10%, IR80b is the shortest wavelength in the wavelength range of 600nm to 720nm at which the internal transmittance is 80%. (色素4) year, The wavelength at which the internal transmittance is 10% is called IR10 (色素4) When this is done, the following equation is satisfied: IR80b (色素4) -IR10 (色素4) ≦80nm

[0035] By satisfying the above (iv-1) to (iv-4), this filter can more selectively transmit light in the RGB bands.

[0036] In (iv-1), IR80a (色素1) -IR10 (色素1) is preferably 24 nm or less, more preferably 23 nm or less.

[0037] In (iv-2), IR80a (色素2) -IR10 (色素2) is preferably 30 nm or less, more preferably 26 nm or less. IR80b (色素2) -IR10 (色素2) is preferably 50 nm or less, more preferably 47 nm or less.

[0038] In (iv-3), IR80a (色素3) -IR10 (色素3) is preferably 33 nm or less, more preferably 30 nm or less. IR80b (色素3) -IR10 (色素3) is preferably 53 nm or less, more preferably 50 nm or less.

[0039] In (iv-4), IR80b (色素4) -IR10 (色素4) is preferably 79 nm or less, more preferably 77 nm or less.

[0040] <Base material, resin layer> The substrate has a resin layer containing a resin and a dye A.

[0041] (resin) The resin is preferably a transparent resin (a resin having transparency). Examples of transparent resins include cycloolefin polymers (COP) or cycloolefin copolymers (COC) such as norbornene resin; polyimide resins (PI); polycarbonate resins (PC); polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate; polyolefin resins such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymer; acrylic resins such as polyacrylate and polymethyl methacrylate; urethane resins, vinyl chloride resins; fluororesins; polyvinyl butyral resins; and polyvinyl alcohol resins. These resins may be used alone or in combination of two or more.

[0042] Among these, from the viewpoint of achieving both transparency in the visible light region (wavelength 400 to 700 nm), heat resistance, and glass transition temperature, cycloolefin polymers, cycloolefin copolymers, polyimide resins, polycarbonate resins, polyethylene terephthalate, acrylic resins, and epoxy resins are preferred, polyethylene terephthalate and polyimide resins are more preferred, and polyimide resins are even more preferred.

[0043] (Dye A) Dye A has a maximum absorption wavelength in the wavelength range of 400 nm or more and less than 700 nm in the spectral transmittance curve of a coating film formed by dissolving dye A in a resin and coating it on a glass substrate.

[0044] The dye A preferably contains dye 1, dye 2, dye 3 and dye 4 from the viewpoint of selectively transmitting light in the RGB wavelength range. Furthermore, when dye A contains dye 1, dye 2, dye 3, and dye 4, it is preferable that all of the following (ii-1) to (ii-4) are satisfied.

[0045] (ii-1) In the spectral transmittance curve of a coating film formed by dissolving the dye 1 in the resin and coating it on a glass substrate, the dye 1 has a maximum absorption wavelength in the wavelength range of 395 nm or more and less than 450 nm. (ii-2) In the spectral transmittance curve of a coating film formed by dissolving the dye 2 in the resin and coating it on a glass substrate, the dye 2 has a maximum absorption wavelength in the wavelength range of 450 nm or more and less than 540 nm. (ii-3) In the spectral transmittance curve of a coating film formed by dissolving the dye 3 in the resin and coating it on a glass substrate, the dye 3 has a maximum absorption wavelength in the wavelength range of 540 nm or more and less than 600 nm. (ii-4) In the spectral transmittance curve of a coating film formed by dissolving the dye 4 in the resin and coating it on a glass substrate, the dye 4 has a maximum absorption wavelength in the wavelength range of 600 nm or more and less than 720 nm.

[0046] By satisfying all of the above (ii-1) to (ii-4), the present filter can more selectively transmit light in the RGB bands.

[0047] In (ii-1), dye 1 preferably has a maximum absorption wavelength in the wavelength range of 395 nm or more and less than 430 nm, and more preferably has a maximum absorption wavelength in the wavelength range of 395 nm or more and less than 420 nm. In (ii-2), dye 2 preferably has a maximum absorption wavelength in the wavelength range of 460 nm or more and less than 530 nm, and more preferably has a maximum absorption wavelength in the wavelength range of 470 nm or more and less than 520 nm. In (ii-3), dye 3 preferably has a maximum absorption wavelength in the wavelength range of 550 nm or more and less than 590 nm, and more preferably has a maximum absorption wavelength in the wavelength range of 560 nm or more and less than 580 nm. In (ii-4), dye 4 preferably has a maximum absorption wavelength in the wavelength range of 640 nm or more and less than 710 nm, and more preferably has a maximum absorption wavelength in the wavelength range of 660 nm or more and less than 710 nm.

[0048] When the resin layer contains dye 1, dye 2, dye 3, dye 4, and a resin, it is preferable that the resin layer satisfies all of the following (iii-1) to (iii-3).

[0049] (iii-1) has a maximum value 10 in the wavelength range of 430 nm or more and less than 490 nm, It has a maximum value 11 in the wavelength range of 490 nm or more and less than 590 nm, It has a maximum value 12 in the wavelength range of 590 nm or more and less than 650 nm. (iii-2) has a wavelength range in which the minimum value is 10 or the internal transmittance is 1% or less in the wavelength range of 400 nm or more and less than 440 nm, The wavelength range is 440 nm or more and less than 540 nm, and the minimum value 11 or the internal transmittance is 1% or less. The wavelength range is 540 nm or more and less than 640 nm, and the minimum value 12 or the internal transmittance is 1% or less. The wavelength range is 640 nm or more and less than 700 nm, and has a minimum value 13 or a wavelength range in which the internal transmittance is 1% or less. (iii-3) The maximum value among the local maximum value 10, the local maximum value 11, and the local maximum value 12 is 40% or more.

[0050] By satisfying all of the above (iii-1) to (iii-3), the present filter can more selectively transmit light in the RGB bands.

[0051] In (iii-1), The wavelength range of the maximum value 10 is preferably 430 nm or more and less than 480 nm, more preferably 430 nm or more and less than 455 nm. The wavelength range of the maximum value 11 is preferably 490 nm or more and less than 550 nm, more preferably 500 nm or more and less than 540 nm. The wavelength range of the maximum value 12 is preferably 590 nm or more and less than 640 nm, more preferably 590 nm or more and less than 630 nm.

[0052] In (iii-2), The wavelength range of the minimum value 10 or the wavelength range in which the internal transmittance is 1% or less is preferably 400 nm or more and less than 430 nm, more preferably 410 nm or more and less than 420 nm. The wavelength range of the minimum value 11 or the wavelength range in which the internal transmittance is 1% or less is preferably 450 nm or more and less than 530 nm, more preferably 460 nm or more and less than 520 nm. The wavelength range of the minimum value 12 or the wavelength range in which the internal transmittance is 1% or less is preferably 550 nm or more and less than 630 nm, and more preferably 560 nm or more and less than 600 nm.

[0053] In (iii-3), The maximum value among local maximum value 10, local maximum value 11 and local maximum value 12 is preferably 55% or more, more preferably 60% or more.

[0054] (dye 1) Dye 1 is preferably a compound represented by the following formula (1).

[0055] [ka]

[0056] In formula (1), R 1 represents a monovalent hydrocarbon group having 1 to 12 carbon atoms which may have a substituent. The substituent is preferably an alkoxy group, an acyl group, an acyloxy group, a cyano group, a dialkylamino group, or a chlorine atom. The alkoxy group, acyl group, acyloxy group, and dialkylamino group preferably have 1 to 6 carbon atoms.

[0057] Unsubstituted R 1 Specifically, preferred are alkyl groups having 1 to 12 carbon atoms in which some of the hydrogen atoms may be substituted with an aliphatic ring, an aromatic ring, or an alkenyl group; cycloalkyl groups having 3 to 8 carbon atoms in which some of the hydrogen atoms may be substituted with an aromatic ring, an alkyl group, or an alkenyl group; and aryl groups having 6 to 12 carbon atoms in which some of the hydrogen atoms may be substituted with an aliphatic ring, an alkyl group, or an alkenyl group.

[0058] R 1When is an unsubstituted alkyl group, the alkyl group may be linear or branched, and more preferably has 1 to 6 carbon atoms.

[0059] R 1 is an alkyl group having 1 to 12 carbon atoms in which some of the hydrogen atoms are substituted with an aliphatic ring, an aromatic ring, or an alkenyl group, an alkyl group having 1 to 4 carbon atoms having a cycloalkyl group having 3 to 6 carbon atoms, or an alkyl group having 1 to 4 carbon atoms substituted with a phenyl group is more preferred, and an alkyl group having 1 or 2 carbon atoms substituted with a phenyl group is particularly preferred. Note that an alkyl group substituted with an alkenyl group means an alkenyl group as a whole that does not have an unsaturated bond between the 1- and 2-positions, such as an allyl group or a 3-butenyl group.

[0060] Preferred R 1 is an alkyl group having 1 to 6 carbon atoms in which some of the hydrogen atoms may be substituted with a cycloalkyl group or a phenyl group. Particularly preferred is Q 1 is an alkyl group having 1 to 6 carbon atoms, and specific examples thereof include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, and a t-butyl group.

[0061] In formula (1), 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.

[0062] Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.

[0063] The alkyl group and alkoxy group preferably have 1 to 6 carbon atoms, and more preferably 1 to 4 carbon atoms.

[0064] R 2 and R 3 At least one of R is preferably an alkyl group, and more preferably both are alkyl groups. 2 and R 3When R is not an alkyl group, a hydrogen atom is more preferred. 2 and R 3 In any case, an alkyl group having 1 to 6 carbon atoms is particularly preferred.

[0065] R 4 and R 5 At least one of R is preferably a hydrogen atom, and more preferably both are hydrogen atoms. 4 or R 5 When is not a hydrogen atom, it is preferably an alkyl group having 1 to 6 carbon atoms.

[0066] In formula (1), Y is R 6 and R 7 represents a methylene group or an oxygen atom substituted with In formula (1), 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.

[0067] In formula (1), X represents any one of the following formulae (X1) to (X5).

[0068] [ka]

[0069] In formulas (X1) to (X4), R 8 and R 9 each independently represents a monovalent hydrocarbon group having 1 to 12 carbon atoms which may 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 may have a substituent.

[0070] R 8 ~R 19 The substituents of R 1 The same substituents as those in R are mentioned, and the preferred embodiments are also the same. 8 ~R 19is a hydrocarbon group having no substituents, R 1 The same aspects as above can be mentioned.

[0071] In formula (X1), R 8 and R 9 may be different groups, but are preferably the same group. 8 and R 9 When is an unsubstituted alkyl group, it may be linear or branched, and more preferably has 1 to 6 carbon atoms.

[0072] Preferred R 8 and R 9 Each of R is an alkyl group having 1 to 6 carbon atoms in which some of the hydrogen atoms may be substituted with a cycloalkyl group or a phenyl group. 8 and R 9 are all alkyl groups having 1 to 6 carbon atoms, and specific examples include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, and a t-butyl group.

[0073] In formula (X2), R 10 and R 11 are more preferably alkyl groups having 1 to 6 carbon atoms, and it is particularly preferred that they are the same alkyl groups.

[0074] In formula (X3), R 12 and R 15 are preferably both hydrogen atoms or unsubstituted alkyl groups having 1 to 6 carbon atoms. 13 and R 14 are preferably all hydrogen atoms or all alkyl groups having 1 to 6 carbon atoms.

[0075] In formula (X4), two groups R bonded to the same carbon atom 16 and R 17 and R 18 and R 19 are preferably all hydrogen atoms or all alkyl groups having 1 to 6 carbon atoms.

[0076] More specifically, compound (1) includes compounds in which the atoms or groups bonded to each skeleton are those shown in the table below.

[0077] [Table 1]

[0078] (dye 3) Dye 3 is preferably a compound represented by the following formula (3).

[0079] [ka]

[0080] In formula (3), R 101 and R 102 each independently represents an alkyl group which may have a substituent, an alkenyl group which may have a substituent, an alkoxycarbonyl group which may have a substituent, or a phenyl group which may have a substituent. Each n independently represents an integer of 0 to 3.

[0081] The alkyl group may be linear or branched, and is preferably an alkyl group having 1 to 6 carbon atoms, more preferably an unsubstituted alkyl group such as a methyl group, an ethyl group, a propyl group, or a t-butyl group.

[0082] The alkenyl group may be linear or branched, and is preferably an alkenyl group having 1 to 6 carbon atoms, more preferably an unsubstituted alkenyl group such as a vinyl group, an allyl group, or a 3-buten-1-yl group.

[0083] The alkoxycarbonyl group is preferably a group having an alkyl group as described above.

[0084] The substituents on the alkyl group, alkenyl group and alkoxycarbonyl group are not particularly limited, but examples thereof include alkoxy groups having the above alkyl groups, and halogen atoms such as chlorine and fluorine.

[0085] The substituent on the phenyl group is not particularly limited, but examples thereof include the above-mentioned alkyl groups, alkoxy groups, and halogen atoms, and preferably an unsubstituted phenyl group.

[0086] In formula (3), each n independently represents an integer of 0 to 3. Preferably, each n independently represents 2 or 3.

[0087] In addition, in compound (3), the groups having two pyrrole rings may be the same or different, but preferably the groups having two pyrrole rings are the same, and the compound is preferably a bilaterally symmetric squarylium compound.

[0088] More specifically, compound (3) includes compounds in which the atoms or groups bonded to each skeleton are those shown in the table below.

[0089] [Table 2]

[0090] (dye 4) Dye 4 is preferably a compound represented by the following formula (4).

[0091] [ka]

[0092] In formula (4), R 21 and R 22 are each independently a hydrogen atom, an alkyl or aryl group having 1 to 6 carbon atoms which may have a substituent, or an aryl or araryl group having 6 to 11 carbon atoms which may have a substituent.

[0093] R23 and R 25 are each independently a hydrogen atom, a halogen atom, or an alkyl or alkoxy group having 1 to 6 carbon atoms.

[0094] R 24 and R 26 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, an alkyl group or an alkoxy group having 1 to 6 carbon atoms, an acyloxy group having 1 to 10 carbon atoms, -NR 27 R 28 Shows.

[0095] R 27 and R 28 are each independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, or -C(=O)-R 29 , -NHR 30 , -SO2-R 30 or a group represented by the following formula (S):

[0096] R 29 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms which may have a substituent, an aryl group having 6 to 11 carbon atoms, or an araryl group having 7 to 18 carbon atoms which may have a substituent and which may have an oxygen atom between the carbon atoms.

[0097] R 30 represents a hydrocarbon group having 1 to 25 carbon atoms in which one or more hydrogen atoms may be substituted with a halogen atom, a hydroxyl group, a carboxy group, a sulfo group, or a cyano group, and which may contain an unsaturated bond, an oxygen atom, or a saturated or unsaturated ring structure between carbon atoms.

[0098] [ka]

[0099] In formula (S), R 41 and R 42 are each independently a hydrogen atom, a halogen atom, or an alkyl or alkoxy group having 1 to 10 carbon atoms.

[0100] k represents 2 or 3.

[0101] R 21 and R 22 , R 22 and R 25 , and R 21 and R 23 may be linked to each other to form, together with the nitrogen atom, a 5- or 6-membered heterocycle A, heterocycle B, and heterocycle C, respectively.

[0102] R when heterocycle A is formed 21 and R 22 represents a divalent group -Q- to which they are bonded, which is an alkylene group or alkyleneoxy group in which a hydrogen atom may be substituted with an alkyl group having 1 to 6 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an acyloxy group having 1 to 10 carbon atoms which may have a substituent.

[0103] R when heterocycle B is formed 22 and R 25 and R when a heterocycle C is formed. 21 and R 23 are the divalent groups -X 1 -Y 1 - and X 2 -Y 2 -(The side that is bonded to nitrogen is X 1 and X 2 ) as X 1 and X 2 are groups represented by the following formula (1x) or (2x), and Y 1 and Y 2 are each a group selected from the following formulae (1y) to (5y):

[0104] X 1 and X 2 are groups represented by the following formula (2x), Y 1 and Y 2 may each be a single bond, in which case there may be an oxygen atom between the carbon atoms.

[0105] [ka]

[0106] In formula (1x), four Z's each independently represent a hydrogen atom, a hydroxyl group, an alkyl group or an alkoxy group having 1 to 6 carbon atoms, or -NR 38 R 39 Shows.

[0107] R 31 ~R 36 are each independently a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an aryl group having 6 to 10 carbon atoms.

[0108] R 37 represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms.

[0109] R 38 and R 39 are each independently a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.

[0110] R 27 , R 28 , R 29 , R 31 ~R 37 , R when not forming a heterocycle 21 ~R 23 , and R 25 may be bonded to any other of these to form a 5- or 6-membered ring. 31 and R 36 , R 31 and R 37 may be directly bonded.

[0111] As the compound (4), for example, a compound represented by the following formula (4-1) is preferred from the viewpoint of increasing the visible light transmittance.

[0112] [ka]

[0113] The symbols in formula (4-1) have the same definitions as those of the same symbols in formula (4), and the preferred embodiments are also the same.

[0114] In the compound (4-1), X 1 As the group (2x), the group (2x) is preferred. 1 is preferably a single bond or a group (1y). 31 ~R 36 is preferably a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, more preferably a hydrogen atom or a methyl group. 1 -X 1 Specific examples of - include divalent organic groups represented by formulas (11-1) to (12-3).

[0115] -C(CH3)2-CH(CH3)- …(11-1) -C(CH3)2-CH2- …(11-2) -C(CH3)2-CH(C2H5)- …(11-3) -C(CH3)2-C(CH3)(nC3H7)- …(11-4) -C(CH3)2-CH2-CH2- …(12-1) -C(CH3)2-CH2-CH(CH3)- …(12-2) -C(CH3)2-CH(CH3)-CH2- …(12-3)

[0116] In addition, in the compound (4-1), R 21 are each independently more preferably a group represented by the following formula (4-11) or (4-12), from the viewpoints of solubility, heat resistance, and the steepness of the change in spectral transmittance curve near the boundary between the visible range and the near-infrared range.

[0117] [ka]

[0118] In formula (4-11) and formula (4-12), R 71 ~R 75are each independently a hydrogen atom, a halogen atom, or an alkyl group having 1 to 4 carbon atoms.

[0119] In compound (4-1), R 24 From the viewpoint of increasing the transmittance of visible light, especially light with a wavelength of 430 to 550 nm, -NH-SO2-R 30 is preferred.

[0120] In compound (4-1), R 24 -NH-SO2-R 30 The compound is shown in the following formula (4-1-A).

[0121] [ka]

[0122] R in compound (4-1-A) 23 and R 26 are each independently preferably a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms, and more preferably a hydrogen atom.

[0123] In compound (4-1-A), R 30 From the viewpoint of light resistance, R are preferably each independently an alkyl group having 1 to 12 carbon atoms which may be branched, an alkoxy group having 1 to 12 carbon atoms which may be branched, or a hydrocarbon group having 6 to 16 carbon atoms and an unsaturated ring structure. Examples of the unsaturated ring structure include benzene, toluene, xylene, furan, and benzofuran. 30 are each more preferably an optionally branched alkyl group having 1 to 12 carbon atoms or an optionally branched alkoxy group having 1 to 12 carbon atoms. 30 In each group represented by the formula (I), some or all of the hydrogen atoms may be substituted with halogen atoms, particularly fluorine atoms.

[0124] More specifically, compound (4) includes compounds in which the atoms or groups bonded to each skeleton in formula (4-1-A) are the atoms or groups shown in the table below.

[0125] [Table 3]

[0126] (Other dyes) The resin layer may further contain a UV dye as another dye. Examples of UV dyes include merocyanine-based, oxazole-based, cyanine-based, naphthalimide-based, oxadiazole-based, oxazine-based, oxazolidine-based, naphthalic acid-based, styryl-based, anthracene-based, cyclic carbonyl-based, and triazole-based dyes.

[0127] (Content of each ingredient) The content of dye 1 in the base material is preferably 0.1 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, relative to 100 parts by mass of the resin. The content of dye 2 in the base material is preferably 0.1 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, relative to 100 parts by mass of the resin. The content of the dye 3 in the base material is preferably 0.1 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, relative to 100 parts by mass of the resin. The content of the dye 4 in the base material is preferably 0.1 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, relative to 100 parts by mass of the resin. The total content of the dyes in the substrate is preferably 0.1 to 20 parts by mass, more preferably 5 to 15 parts by mass, relative to 100 parts by mass of the resin.

[0128] (Base material composition) The substrate may have a single layer structure or a multi-layer structure. The material of the substrate is not particularly limited, and may be an organic or inorganic material as long as it is a transparent material that transmits visible light of 400 to 700 nm.

[0129] When the substrate has a single layer structure, the substrate is preferably a resin substrate containing dye A and a resin. The resin substrate may further contain a UV dye. When the substrate has a multilayer structure, the substrate preferably has a structure in which a resin layer containing dye A and a resin is laminated on at least one main surface of a support. In this case, the support is preferably made of the above-mentioned transparent resin or transparent inorganic material. The resin layer may further contain a UV dye.

[0130] As the transparent inorganic material, glass or crystalline material is preferred. Examples of glass include absorbing glass (near-infrared absorbing glass) containing copper ions in fluorophosphate glass or phosphate glass, soda-lime glass, borosilicate glass, alkali-free glass, and quartz glass. Absorbing glass is preferred depending on the purpose, and phosphate glass and fluorophosphate glass are preferred from the viewpoint of absorbing infrared light. When it is desired to capture a large amount of red light (600 to 700 nm), alkali glass, alkali-free glass, and quartz glass are preferred. Note that "phosphate glass" also includes silicophosphate glass, in which part of the glass skeleton is composed of SiO2.

[0131] The glass may be chemically strengthened glass obtained by ion exchange at a temperature equal to or lower than the glass transition point to exchange alkali metal ions (e.g., Li ions, Na ions) having a small ionic radius present on the main surface of the glass plate with alkali ions having a larger ionic radius (e.g., Na ions or K ions for Li ions, and K ions for Na ions).

[0132] Examples of the crystalline material include birefringent crystals such as quartz, lithium niobate, and sapphire.

[0133] As the support, inorganic materials are preferred, and glass and sapphire are particularly preferred, from the viewpoint of shape stability related to long-term reliability of optical properties, mechanical properties, etc., and ease of handling during filter production.

[0134] When the substrate is a resin substrate having a single layer structure containing a transparent resin and dye A, it can be produced, for example, by the following method.

[0135] The resin substrate can be produced by melt-extruding a transparent resin or a mixture of a transparent resin and optional components to form a film. Alternatively, the transparent resin and optional components, if necessary, are dissolved in a solvent to prepare a coating solution, which is then applied to a peelable substrate for producing the resin substrate in a desired thickness, dried, and further cured as necessary, and the resin substrate can then be peeled off from the substrate.

[0136] The solvent used in the coating solution may be any dispersion medium capable of stably dispersing or dissolving the transparent resin. The coating solution may contain a surfactant to prevent voids caused by minute bubbles, depressions caused by the adhesion of foreign matter, and repellency during the drying process. Furthermore, the coating solution can be applied by, for example, dip coating, cast coating, die coating, or spin coating.

[0137] When the substrate has a multilayer structure having a support and a resin layer containing dye A laminated on at least one main surface of the support, the thickness of the resin layer is preferably 0.3 to 15 μm. When the resin layer is made up of multiple layers, the total thickness of the resin layers is preferably 0.3 to 15 μm.

[0138] The resin layer can be formed by dissolving or dispersing dye A, resin or resin raw material components, and other components, if necessary, in a solvent to prepare a coating solution, applying the coating solution to a substrate, drying, and optionally curing the coating solution. The substrate may be the support included in the filter, or a peelable substrate used only when forming the resin layer. The solvent may be any dispersion medium or solvent capable of stably dispersing the dye.

[0139] The coating liquid may also contain a surfactant to prevent voids caused by microbubbles, depressions caused by the adhesion of foreign matter, and repellency during the drying process. The coating liquid can be applied by, for example, dip coating, cast coating, or spin coating. The coating liquid is applied to a substrate and then dried to form a resin layer. When the coating liquid contains raw materials for a transparent resin, it is further subjected to a curing treatment such as heat curing or photocuring.

[0140] The resin layer can also be produced in the form of a film by extrusion molding, and this film may be laminated on another member and integrated by thermocompression bonding, etc. For example, this film may be attached to a support.

[0141] The present filter may have one resin layer or two or more layers. When the present filter has two or more resin layers, the layers may have the same or different configurations.

[0142] The shape of the substrate is not particularly limited, and may be a block, plate, or film.

[0143] When the substrate has a single layer structure, the thickness of the substrate is preferably 500 μm or less, more preferably 400 μm or less, from the viewpoint of reducing the height of the present filter. When the substrate has a single layer structure, the thickness of the substrate is preferably 30 μm or more, more preferably 50 μm or more, from the viewpoint of handling in the process.

[0144] When the substrate has a multilayer structure, the thickness of the substrate is preferably 500 μm or less, more preferably 400 μm or less, from the viewpoint of reducing the height of the present filter. Also, when the substrate has a multilayer structure, the thickness of the substrate is preferably 30 μm or more, more preferably 50 μm or more, from the viewpoint of handling in the process.

[0145] <Dielectric multilayer film> The filter includes a dielectric multilayer film laminated as an outermost layer on at least one of the main surfaces of the substrate.

[0146] When a dielectric multilayer film is laminated as the outermost layer on both main surfaces of a substrate, at least one of the dielectric multilayer films is preferably designed as a near-infrared reflective layer (hereinafter also referred to as an NIR reflective layer), and the other of the dielectric multilayer films is preferably designed as an NIR reflective layer, a reflective layer having a reflection region other than the near-infrared region, or an antireflection layer.

[0147] When the substrate has a single layer structure, it is preferable to form an NIR reflective layer on both sides of the substrate in order to prevent warping.

[0148] The NIR reflective layer is a dielectric multilayer film designed to block light in the near-infrared region. The NIR reflective layer has wavelength selectivity, for example, to transmit visible light and mainly reflect light in the near-infrared region other than the light-blocking region of the absorption layer. The reflective region of the NIR reflective layer may include the light-blocking region in the near-infrared region of the absorption layer. The NIR reflective layer is not limited to NIR reflection characteristics, and may be appropriately designed to further block light in wavelength regions other than the near-infrared region, for example, the near-ultraviolet region.

[0149] The NIR reflective layer is composed of, for example, a dielectric multilayer film in which dielectric films with low refractive index (low refractive index film) and dielectric films with high refractive index (high refractive index film) are alternately laminated. The high refractive index film preferably has a refractive index of 1.6 or more, more preferably 2.2 to 2.5. Examples of materials for the high refractive index film include Ta2O5, TiO2, and Nb2O5. Of these, TiO2 is preferred in terms of film formability, reproducibility in refractive index, etc., and stability.

[0150] On the other hand, the low refractive index film preferably has a refractive index of less than 1.6, more preferably 1.45 or more and less than 1.55. Examples of materials for the low refractive index film include SiO2, SiO x N y In terms of reproducibility, stability, economy, etc. in film formation, SiO2 is preferred.

[0151] Furthermore, it is preferable that the transmittance of the NIR reflective layer changes sharply in the boundary wavelength region between the transmission region and the light-blocking region. For this purpose, the total number of laminated layers of the dielectric multilayer film constituting the reflective layer is preferably 15 or more, more preferably 25 or more, and even more preferably 30 or more. However, since a large total number of laminated layers can cause warping or an increase in film thickness, the total number of laminated layers is preferably 100 or less, more preferably 75 or less, and even more preferably 60 or less. Furthermore, the overall film thickness of the reflective layer is preferably 2 to 10 μm.

[0152] When the total number of layers and the film thickness of the dielectric multilayer film are within the above ranges, the NIR reflective layer satisfies the requirement for miniaturization, and the incidence angle dependency can be suppressed while maintaining high productivity. In addition, the dielectric multilayer film can be formed by, for example, a vacuum film formation process such as a CVD method, a sputtering method, or a vacuum deposition method, or a wet film formation process such as a spray method or a dipping method.

[0153] The NIR reflective layer may be a single layer (a group of dielectric multilayer films) that imparts predetermined optical characteristics, or two layers that impart predetermined optical characteristics. When the present filter has two or more NIR reflective layers, the reflective layers may have the same or different configurations. When the present filter has two or more NIR reflective layers, the filter is typically composed of multiple NIR reflective layers with different reflection bands. When two NIR reflective layers are provided, one may be a near-infrared reflective layer that blocks light in the short wavelength band of the near-infrared region, and the other may be a near-infrared / near-ultraviolet reflective layer that blocks light in both the long wavelength band of the near-infrared region and the near-ultraviolet region.

[0154] Examples of antireflection layers include dielectric multilayer films, intermediate refractive index media, and moth-eye structures in which the refractive index changes gradually. Among these, dielectric multilayer films are preferred from the viewpoints of optical efficiency and productivity. Antireflection layers are obtained by alternately laminating dielectric films, similar to reflective layers.

[0155] Furthermore, it is preferable that the dielectric multilayer film satisfies all of the following (vi-1) to (vi-7) in the spectral transmittance curve at an incident angle of 5° and the spectral transmittance curve at an incident angle of 30°. (vi-1) The average reflectance of light with a wavelength of 430 nm or more and less than 490 nm is 30% or less. (vi-2) The average reflectance of light with a wavelength of 490 nm or more and less than 590 nm is 30% or less. (vi-3) The average reflectance of light with a wavelength of 590 nm or more and less than 650 nm is 30% or less. (vi-4) The average transmittance of light with a wavelength of 430 nm or more and less than 490 nm is 70% or more. (vi-5) The average transmittance of light with a wavelength of 490 nm or more and less than 590 nm is 80% or more. (vi-6) The average transmittance of light with a wavelength of 590 nm or more and less than 650 nm is 80% or more. (vi-7) The average transmittance of light having a wavelength of 700 nm or more and less than 1000 nm is 20% or less.

[0156] When the dielectric multilayer film satisfies the above (vi-1) to (vi-7), it is possible to suppress intensity fluctuations in the spectral characteristics, known as ripples.

[0157] In (vi-1), The average reflectance is preferably 28% or less, more preferably 25% or less. In (vi-2), The average reflectance is preferably 15% or less, more preferably 10% or less. In (vi-3), The average reflectance is preferably 15% or less, more preferably 10% or less.

[0158] In (vi-4), The average transmittance is preferably 72% or more, and more preferably 74% or more. In (vi-5), The average transmittance is preferably 85% or more, more preferably 87% or more. In (vi-6), The average transmittance is preferably 85% or more, more preferably 87% or more.

[0159] In (vi-7), The average transmittance is preferably 18% or less, more preferably 15% or less.

[0160] [Imaging device] This filter can be used in imaging devices such as digital still cameras. When this filter is used in an imaging device, it provides excellent color reproducibility.

[0161] The imaging device includes a solid-state imaging element, an imaging lens, and the present filter. The present 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. [Example]

[0162] Next, the present invention will be explained more specifically with reference to examples.

[0163] [Pigment compounds] <Dye compound 1-1> "DA115" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 1-1.

[0164] <Dye Compound 1-2> The following dye compound 1-2 was synthesized with reference to Japanese Patent No. 6504176.

[0165] [ka]

[0166] <Dye Compounds 1-3> The following dye compound 1-3 was synthesized with reference to Japanese Patent No. 6504176.

[0167] [ka]

[0168] <Dye Compounds 1-4> "DAA108" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 1-4.

[0169] <Dye Compounds 1-5> "FDB005" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 1-5.

[0170] <Dye compound 2-1> "FDB005" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 2-1.

[0171] <Dye compound 2-2> "DAA108" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 2-2.

[0172] <Dye compound 2-3> "FDB006" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 2-3.

[0173] <Dye Compound 2-4> "FDG002" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 2-4.

[0174] <Dye Compound 2-5> "FDB19" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 2-5.

[0175] <Dye Compound 2-6> "DA115" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 2-6.

[0176] <Dye compound 3-1> "IMM2" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 3-1.

[0177] <Dye compound 3-2> "FDG003" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 3-2.

[0178] <Dye compound 3-3> The following dye compound 3-3 was synthesized with reference to JP-A-2001-183522.

[0179] [ka]

[0180] <Dye compound 4-1> "FDR003" manufactured by Yamada Chemical Co., Ltd. was used as dye compound 4-1.

[0181] <Dye compound 4-2> The following dye compound 4-2 was synthesized with reference to Japanese Patent No. 6197940.

[0182] [ka]

[0183] [Test Example 1] <Test Example 1a-1> Dye compound 1-1 was mixed with C-3G30G (polyimide varnish, manufactured by Mitsubishi Gas Chemical Company) diluted with cyclohexanone, and dye compound 1-1 was thoroughly dissolved in the polyimide resin solution to obtain a resin solution (dye compound content: 4.5% by mass).

[0184] The obtained resin solution was applied to Shotto D263 (alkali glass) by spin coating, and the organic solvent was removed by sufficient heating to prepare a coating film with a thickness of 1.0 μm.

[0185] The resulting coating film was subjected to transmission spectroscopy measurement using a Hitachi High-Tech Science ultraviolet-visible-near-infrared spectrophotometer "UH4150" in the wavelength range of 350 nm to 1200 nm at incident angles of 0° and 5° to the incident direction.

[0186] From the obtained transmittance and reflectance data, the internal transmittance at wavelengths of 350 nm to 1200 nm was calculated according to the following formula. Internal transmittance={T 0deg / (100-R 5deg )}×100 T 0deg means the measured transmittance at 0°, and R 5deg means reflectance at 5°.

[0187] The results of correction so that the internal transmittance at the maximum absorption wavelength was 10% are shown in Table 4.

[0188] <Test Examples 1a-2 to 1a-8> The same operation as in Test Example 1a-1 was carried out, except that the type of dye compound, the content of the dye compound, and the type of resin were as shown in Table 4. The results are shown in Table 4.

[0189] The meaning of each term is as follows: C-3G30G: Polyimide varnish manufactured by Mitsubishi Gas Chemical Company F4520: JSR, cycloolefin resin B-OKP2: Polyester resin manufactured by Osaka Gas Chemicals Co., Ltd. IR80a: The longest wavelength in the wavelength range of 395 nm to 450 nm at which the internal transmittance is 80% IR80b: The shortest wavelength in the wavelength range of 395 nm to 450 nm at which the internal transmittance is 80% IR10: Wavelength at which the internal transmittance is 10% in the wavelength range of 395 nm or more and less than 450 nm λ Max : Maximum absorption wavelength

[0190] [Table 4]

[0191] <Test Examples 1b-1 to 1b-11> The same operation as in Test Example 1a-1 was performed, except that the type of dye compound, the content of the dye compound, the type of resin, and the thickness of the coating film were as shown in Table 5. The results are shown in Table 5.

[0192] The meaning of each term is as follows: IR80a: The longest wavelength in the wavelength range of 450 nm to 540 nm at which the internal transmittance is 80% IR80b: The shortest wavelength in the wavelength range of 450 nm to 540 nm at which the internal transmittance is 80% IR10: Wavelength at which the internal transmittance is 10% in the wavelength range of 450 nm or more and less than 540 nm

[0193] [Table 5]

[0194] <Test Examples 1c-1 to 1c-5> The same operation as in Test Example 1a-1 was performed, except that the type of dye compound, the content of the dye compound, the type of resin, and the thickness of the coating film were as shown in Table 6. The results are shown in Table 6.

[0195] The meaning of each term is as follows: IR80a: The longest wavelength in the wavelength range of 540 nm to 600 nm at which the internal transmittance is 80% IR80b: The shortest wavelength in the wavelength range of 540 nm to 600 nm at which the internal transmittance is 80% IR10: Wavelength at which the internal transmittance is 10% in the wavelength range of 540 nm or more and less than 600 nm

[0196] [Table 6]

[0197] <Test Examples 1d-1 to 1d-2> The same operation as in Test Example 1a-1 was performed, except that the type of dye compound, the content of the dye compound, the type of resin, and the thickness of the coating film were as shown in Table 7. The results are shown in Table 7.

[0198] The meaning of each term is as follows: IR80a: The longest wavelength in the wavelength range of 600 nm to 720 nm at which the internal transmittance is 80% IR80b: The shortest wavelength in the wavelength range of 600 nm to 720 nm at which the internal transmittance is 80% IR10: Wavelength at which the internal transmittance is 10% in the wavelength range of 600 nm or more and less than 720 nm

[0199] [Table 7]

[0200] [Test Example 2] <Test Example 2-1> Dye compound 1-2 (2.55 mass%), dye compound 2-5 (3.56 mass%), dye compound 3-3 (3.34 mass%), dye compound 4-2 (4.06 mass%), and C-3G30G (polyimide varnish, manufactured by Mitsubishi Gas Chemical Company) diluted with cyclohexanone were mixed, and the dye compounds and polyimide resin solution were thoroughly dissolved to obtain a resin solution.

[0201] The obtained resin solution was applied to Shotto D263 (alkali glass) by spin coating, and the organic solvent was removed by sufficient heating to prepare a coating film having a thickness of 2 μm.

[0202] The obtained coating film was subjected to transmission spectroscopy measurement using a Hitachi High-Tech Science ultraviolet-visible-near-infrared spectrophotometer "UH4150" in the wavelength range of 350 nm to 1200 nm at an incident direction of 0°. The results are shown in Table 8.

[0203] <Test Examples 2-2 to 2-4> The same procedure as in Test Example 2-1 was carried out, except that the type and content of the dye compound were as shown in Table 8. The results are shown in Table 8.

[0204] [Table 8]

[0205] [Test Example 3] A 48-layer dielectric multilayer film consisting of SiO2 and TiO2 was deposited by vapor deposition on Shotto D263 (alkali glass). The transmission spectrum of the resulting dielectric multilayer film was measured using a Hitachi High-Tech Science UV-Vis-NIR spectrophotometer "UH4150" at wavelengths from 350 nm to 1200 nm at angles of 5° and 30° to the incident direction. The results are shown in Table 9.

[0206] [Table 9]

[0207] Test Example 3 revealed that the obtained dielectric multilayer film had sufficiently high transmittance in the visible range and low reflection / transmittance in the visible range.

[0208] [Test Example 4] <Test Example 4-1 (Example)> Dye compound 1-2 (2 mass%), dye compound 2-5 (2.8 mass%), dye compound 3-3 (2.5 mass%), dye compound 4-2 (4.5 mass%), and C-3G30G (polyimide varnish, manufactured by Mitsubishi Gas Chemical Company) diluted with cyclohexanone were mixed, and the dye compounds and polyimide resin solution were thoroughly dissolved to obtain a resin solution.

[0209] Furthermore, the dielectric multilayer film obtained in Test Example 3 was formed by vapor deposition on Shotto D263 (alkali glass, thickness 0.2 mm).

[0210] The resin solution was spin-coated onto D263 (alkali glass) on which a dielectric multilayer film had been formed, and then heated thoroughly to remove the organic solvent, producing a 3-μm-thick coating. A seven-layer anti-reflection coating consisting of SiO2 and TiO2 was then deposited on top of the resulting coating by vapor deposition.

[0211] The transmission spectrum of the coated film with the anti-reflection coating deposited was measured using a Hitachi High-Tech Science ultraviolet-visible-near-infrared spectrophotometer "UH4150" in the wavelength range of 350 nm to 1200 nm at angles of 0° and 30° to the incident direction. The results are shown in Table 10.

[0212] [Table 10]

[0213] <Test Example 4-2 (Example)> The same operation as in Test Example 4-1 was carried out, except that D263 (alkali glass) was changed to fluorophosphate glass (manufactured by AGC) that blocks infrared rays. The results are shown in Table 11 and FIG.

[0214] [Table 11]

[0215] <Test Example 4-3> A 34-layer dielectric multilayer film consisting of SiO2 and TiO2, which transmits light in the blue, green, and red bands, was formed by vapor deposition on Shotto D263 (alkali glass, 0.2 mm thick).

[0216] The resulting film was subjected to transmission spectroscopy measurement using a Hitachi High-Tech Science ultraviolet-visible-near-infrared spectrophotometer "UH4150" in the wavelength range of 350 nm to 1200 nm at incident angles of 0° and 30° relative to the incident direction. The results are shown in Table 12.

[0217] [Table 12]

[0218] Test Example 4 revealed that the coating film (resin layer) of the example had sufficiently high transmittance in the blue band, the green band, and the red band.

[0219] Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. This application is based on a Japanese patent application (Patent Application No. 2020-137088) filed on August 14, 2020, the contents of which are incorporated herein by reference. [Explanation of symbols]

[0220] 10 Optical Filters 11 Base material 12 Dielectric multilayer film

Claims

1. An optical filter comprising a substrate and a dielectric multilayer film laminated on at least one main surface side of the substrate, the substrate has a resin layer containing a resin and a dye A, The dye A has an absorption maximum wavelength in the wavelength range of 400 nm or more and less than 700 nm, An optical filter that satisfies all of the following (i-1) to (i-9): (i-1) In the spectral transmittance curve at an incident angle of 0°, The maximum value 1 is in the wavelength range of 430 nm or more and less than 490 nm. （０ｄｅｇ） and Maximum value 2 in the wavelength range of 490 nm or more and less than 590 nm （０ｄｅｇ） and The maximum value 3 is in the wavelength range of 590 nm or more and less than 650 nm. （０ｄｅｇ） It has. (i-2) In the spectral transmittance curve at an incident angle of 30°, The maximum value 1 is in the wavelength range of 430 nm or more and less than 490 nm. （３０ｄｅｇ） and Maximum value 2 in the wavelength range of 490 nm or more and less than 590 nm （３０ｄｅｇ） and The maximum value 3 is in the wavelength range of 590 nm or more and less than 650 nm. （３０ｄｅｇ） It has. (i-3) In the spectral transmittance curve at an incident angle of 0°, the minimum value 1 is in the wavelength range of 440 nm or more and less than 550 nm. （０ｄｅｇ） or has a wavelength range in which the transmittance is 1% or less, Minimum value 2 in the wavelength range of 490 nm or more and less than 610 nm （０ｄｅｇ） Or, it has a wavelength range in which the transmittance is 1% or less. (i-4) In the spectral transmittance curve at an incident angle of 30°, the minimum value 1 is in the wavelength range of 440 nm or more and less than 550 nm. （３０ｄｅｇ） or has a wavelength range in which the transmittance is 1% or less, Minimum value 2 in the wavelength range of 490 nm or more and less than 610 nm （３０ｄｅｇ） Or, it has a wavelength range in which the transmittance is 1% or less. (i-5) All of the following formulas are satisfied: Maximum value 1 （０ｄｅｇ） -Minimum 1 （０ｄｅｇ） ≧40% Maximum 2 （０ｄｅｇ） -Minimum 1 （０ｄｅｇ） ≧30% Maximum 2 （０ｄｅｇ） -Minimum 2 （０ｄｅｇ） ≧30% Maximum 3 （０ｄｅｇ） -Minimum 2 （０ｄｅｇ） ≧27% (i-6) All of the following formulas are satisfied: Maximum value 1 （３０ｄｅｇ） -Minimum 1 （３０ｄｅｇ） ≧30% Maximum 2 （３０ｄｅｇ） -Minimum 1 （３０ｄｅｇ） ≧30% Maximum 2 （３０ｄｅｇ） -Minimum 2 （３０ｄｅｇ） ≧30% Maximum 3 （３０ｄｅｇ） -Minimum 2 （３０ｄｅｇ） ≧27% (i-7) In the spectral transmittance curve at an incident angle of 0°, Average transmittance in the wavelength range of 700 to 1000 nm （０ｄｅｇ） is less than 5%. (i-8) In the spectral transmittance curve at an incident angle of 30°, Average transmittance in the wavelength range of 700 to 1000 nm （３０ｄｅｇ） is less than 5%. (i-9) All of the following formulas are satisfied: 0.85≦maximum value 1 （３０ｄｅｇ） / Maximum value 1 （０ｄｅｇ） ≦1.12 0.85≦maximum value 2 （３０ｄｅｇ） / Maximum value 2 （０ｄｅｇ） ≦1.12 0.85≦maximum value 3 （３０ｄｅｇ） / Maximum value 3 （０ｄｅｇ） ≦1.12

2. 2. The optical filter according to claim 1, further satisfying all of the following formulas: | Wavelength λ1 （０ｄｅｇ） - Wavelength λ1 （３０ｄｅｇ） | ≤ 10 nm | Wavelength λ2 （０ｄｅｇ） - Wavelength λ2 （３０ｄｅｇ） | ≤ 10 nm | Wavelength λ3 （０ｄｅｇ） - Wavelength λ3 （３０ｄｅｇ） | ≤ 10 nm | Wavelength λ4 （０ｄｅｇ） - Wavelength λ4 （３０ｄｅｇ） | ≤ 10 nm <In the formula, wavelength λ1 （０ｄｅｇ） , wavelength λ1 （３０ｄｅｇ） , wavelength λ2 （０ｄｅｇ） , wavelength λ2 （３０ｄｅｇ） , wavelength λ3 （０ｄｅｇ） , wavelength λ3 （３０ｄｅｇ） , wavelength λ4 （０ｄｅｇ） , wavelength λ4 （３０ｄｅｇ） is a value calculated by the following formula: Wavelength λ1 （０ｄｅｇ） = {maximum value 1 （０ｄｅｇ） Wavelength at + minimum value 1 （０ｄｅｇ） wavelength at Wavelength λ1 （３０ｄｅｇ） = {maximum value 1 （３０ｄｅｇ） Wavelength at + minimum value 1 （３０ｄｅｇ） wavelength at Wavelength λ2 （０ｄｅｇ） = {maximum value 2 （０ｄｅｇ） Wavelength at + minimum value 1 （０ｄｅｇ） wavelength at Wavelength λ2 （３０ｄｅｇ） = {maximum value 2 （３０ｄｅｇ） Wavelength at + minimum value 1 （３０ｄｅｇ） wavelength at Wavelength λ3 （０ｄｅｇ） = {maximum value 2 （０ｄｅｇ） Wavelength at + minimum value 2 （０ｄｅｇ） wavelength at Wavelength λ3 （３０ｄｅｇ） = {maximum value 2 （３０ｄｅｇ） Wavelength at + minimum value 2 （３０ｄｅｇ） wavelength at Wavelength λ4 （０ｄｅｇ） = {maximum value 3 （０ｄｅｇ） Wavelength at + minimum value 2 （０ｄｅｇ） wavelength at Wavelength λ4 （３０ｄｅｇ） = {maximum value 3 （３０ｄｅｇ） Wavelength at + minimum value 2 （３０ｄｅｇ） Wavelength at

3. 3. The optical filter according to claim 1, further satisfying the following formula: Maximum value 1 （０ｄｅｇ） -Minimum 1 （０ｄｅｇ） ≧50.1%

4. The optical filter according to any one of claims 1 to 3, further satisfying the following formula: Minimum value 1 （０ｄｅｇ） ≦20.6%

5. The dye A contains dye 1, dye 2, dye 3, and dye 4, The optical filter according to any one of claims 1 to 4, wherein the following (ii-1) to (ii-4) are all satisfied: (ii-1) In the spectral transmittance curve of a coating film formed by dissolving the dye 1 in the resin and coating it on a glass substrate, the dye 1 has a maximum absorption wavelength in the wavelength range of 395 nm or more and less than 450 nm. (ii-2) In the spectral transmittance curve of a coating film formed by dissolving the dye 2 in the resin and coating it on a glass substrate, the dye 2 has a maximum absorption wavelength in the wavelength range of 450 nm or more and less than 540 nm. (ii-3) In the spectral transmittance curve of a coating film formed by dissolving the dye 3 in the resin and coating it on a glass substrate, the dye 3 has a maximum absorption wavelength in the wavelength range of 540 nm or more and less than 600 nm. (ii-4) In the spectral transmittance curve of a coating film formed by dissolving the dye 4 in the resin and coating it on a glass substrate, the dye 4 has a maximum absorption wavelength in the wavelength range of 600 nm or more and less than 720 nm.

6. 6. The optical filter according to claim 5, wherein the resin layer containing the pigment 1, the pigment 2, the pigment 3, the pigment 4, and the resin satisfies all of the following (iii-1) to (iii-3): (iii-1) has a maximum value of 10 in the wavelength range of 430 nm or more and less than 490 nm; It has a maximum value 11 in the wavelength range of 490 nm or more and less than 590 nm, It has a maximum value 12 in the wavelength range of 590 nm or more and less than 650 nm. (iii-2) has a wavelength range in which the minimum value is 10 or the internal transmittance is 1% or less in the wavelength range of 400 nm or more and less than 440 nm, The wavelength range is 440 nm or more and less than 540 nm, and the minimum value 11 or the internal transmittance is 1% or less. The wavelength range is 540 nm or more and less than 640 nm, and the minimum value 12 or the internal transmittance is 1% or less. The wavelength range in which the minimum value 13 or the internal transmittance is 1% or less is within a wavelength range of 640 nm or more and less than 700 nm. (iii-3) The maximum value among the local maximum value 10, the local maximum value 11, and the local maximum value 12 is 40% or more.

7. The optical filter according to claim 5 or 6, further satisfying all of the following (iv-1) to (iv-4): (iv-1) In the spectral transmittance curve of a coating film obtained by dissolving the dye 1 in the resin and coating the resin on a glass substrate so that the internal transmittance at the absorption maximum wavelength is 10%, The longest wavelength at which the internal transmittance is 80% in the wavelength range of 395 nm or more and less than 450 nm is IR80a （色素１） year, The wavelength at which the internal transmittance is 10% is called IR10 （色素１） When this is done, the following equation is satisfied: IR80a （色素１） -IR10 （色素１） ≦25nm (iv-2) In the spectral transmittance curve of a coating film obtained by dissolving the dye 2 in the resin and coating it on a glass substrate so that the internal transmittance at the absorption maximum wavelength is 10%, The longest wavelength at which the internal transmittance is 80% in the wavelength range of 450 nm or more and less than 540 nm is IR80a （色素２） year, The shortest wavelength at which the internal transmittance is 80% is called IR80b. （色素２） year, The wavelength at which the internal transmittance is 10% is called IR10 （色素２） When this is done, the following equation is satisfied: IR80a （色素２） -IR10 （色素２） ≦35nm IR80A （色素２） -IR10 （色素２） ≦55nm (iv-3) In the spectral transmittance curve of a coating film obtained by dissolving the dye 3 in the resin and coating it on a glass substrate so that the internal transmittance at the absorption maximum wavelength is 10%, The longest wavelength at which the internal transmittance is 80% in the wavelength range of 540 nm or more and less than 600 nm is IR80a （色素３） year, The shortest wavelength at which the internal transmittance is 80% is called IR80b. （色素３） year, The wavelength at which the internal transmittance is 10% is called IR10 （色素３） When this is done, the following equation is satisfied: IR80a （色素３） -IR10 （色素３） ≦35nm IR80A （色素３） -IR10 （色素３） ≦55nm (iv-4) In the spectral transmittance curve of a coating film obtained by dissolving the dye 4 in the resin and coating it on a glass substrate so that the internal transmittance at the absorption maximum wavelength is 10%, The shortest wavelength at which the internal transmittance is 80% in the wavelength range of 600 nm or more and less than 720 nm is IR80b （色素４） year, The wavelength at which the internal transmittance is 10% is called IR10 （色素４） When this is done, the following equation is satisfied: IR80A （色素４） -IR10 （色素４） ≦80nm

8. The optical filter according to any one of claims 1 to 7, wherein the dielectric multilayer film satisfies all of the following (vi-1) to (vi-7) in a spectral transmittance curve at an incident angle of 5° and a spectral transmittance curve at an incident angle of 30°: (vi-1) The average reflectance of light having a wavelength of 430 nm or more and less than 490 nm is 30% or less. (vi-2) The average reflectance of light having a wavelength of 490 nm or more and less than 590 nm is 30% or less. (vi-3) The average reflectance of light having a wavelength of 590 nm or more and less than 650 nm is 30% or less. (vi-4) The average transmittance of light having a wavelength of 430 nm or more and less than 490 nm is 70% or more. (vi-5) The average transmittance of light having a wavelength of 490 nm or more and less than 590 nm is 80% or more. (vi-6) The average transmittance of light having a wavelength of 590 nm or more and less than 650 nm is 80% or more. (vi-7) The average transmittance of light having a wavelength of 700 nm or more and less than 1000 nm is 20% or less.

9. the substrate has a support, the resin layer is laminated on at least one main surface of the support, The optical filter according to any one of claims 1 to 8, wherein the support comprises a transparent glass or an absorbing glass.

10. 10. The optical filter according to claim 1, wherein the resin is a polyimide resin.

11. 11. The optical filter according to claim 1, comprising the resin layer and another resin layer.

12. An imaging device comprising the optical filter according to any one of claims 1 to 11.

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