Filter lens and manufacturing method thereof

Abstract

A filter lens and a method of preparing a filter lens including a copper complex wherein the copper complex is formed from a copper compound providing a copper ion, a phosphonic acid as shown in Formula 1 herein, and at least one phosphorus-containing compound as shown in Formula 2 to Formula 4 herein wherein the filter lens has an OD value of greater than 4 for a wavelength of incident light of 930 nm to 950 nm. According to the invention, the lens has a function of filtering near infrared rays and replaces a traditional optical filter assembly, so that the size of a finished product assembled into an optical lens module is reduced; the filter lens can further filter light rays with other specific wavelengths, and the number of lenses of the optical lens module is reduced.

Description

Technical Field

[0001] The invention relates to a filter lens, in particular to a filter lens with near infrared ray absorption function. Background Art

[0002] Existing optical lens modules generally include components such as lens groups, filters and photosensitive elements. The photosensitive components can be designed to detect light of different wavelengths for different applications, such as infrared (applicable in 3D detection), visible light (applicable in general cameras or video cameras), ultraviolet light (applicable in self-driving car lidar lenses) and X-rays (applicable in digital filmless X-ray machines).

[0003] In general camera or video camera applications, photosensitive elements mainly detect within the range of visible light and part of near-infrared light. However, it is expected that photosensitive elements only detect visible light, and near-infrared light is considered as interference to the image. In the past, an independent external filter was usually set on the light-incoming side of the optical lens module, which has a high absorption rate for near-infrared light and a high transmittance for light of other wavelengths, thereby achieving the purpose of filtering out near-infrared light. However, the use of an external filter to filter out near-infrared light has the problem of the optical lens module being too large due to the space provided for the installation of the external filter.

[0004] In addition, in order to improve functionality and image quality, the number of lens groups has increased, and the problem of the optical lens module being too large has been further exacerbated in order to accommodate these lenses.

[0005] The inability to reduce the size of optical lens modules has resulted in the common problem of protruding lenses in current mobile phones, even for high-end phones. This increases the risk of bumps and damages, and also fails to meet the market's expectations for smaller and thinner components. Summary of the invention

[0006] In view of the above problems, the present invention provides a filter lens, which comprises:

[0007] A copper complex comprising a copper compound providing copper ions, a phosphonic acid as shown in Formula 1 and at least one

[0008] The phosphorus-containing compounds shown in Formula 2 to Formula 4 are formed,

[0009]

[0010] Among them, R, R 1 , R 2 , R 3 are each independently substituted or unsubstituted C 1 To C 12 Alkyl or C 6 To C 12 Aryl;

[0011] The OD value of the filter lens for incident light wavelengths from 930nm to 950nm is greater than 4.

[0012] In one embodiment, the substituted or unsubstituted C 1 To C 12 The alkyl group is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl and tert-butyl; substituted or unsubstituted C 6 To C 12 The aryl group is selected from the group consisting of phenyl, naphthyl and chlorophenyl.

[0013] In one embodiment, the filter lens has a haze of 0.4% or less.

[0014] In one embodiment, the X-ray photoelectron spectrum of the filter lens has at least one main peak at a binding energy of 930 eV to 940 eV. In another embodiment, the counts per second value of at least one main peak in the X-ray photoelectron spectrum of the filter lens is greater than 4500.

[0015] In one embodiment, the thickness of the filter lens is 25 μm to 150 μm.

[0016] In one embodiment, the filter lens further comprises an optical resin. In another embodiment, the optical resin is a thermoplastic resin and / or a photocurable resin. In another embodiment, the optical resin is selected from polycarbonates, polyesters, polycycloolefins, polyacrylic acids, silicone resins and polyimides. In another embodiment, the optical resin is methyl methacrylate.

[0017] In one embodiment, the filter lens further comprises an infrared absorbing dye and / or an ultraviolet absorbing dye.

[0018] In one embodiment, the filter lens is a concave lens, a convex lens or a flat lens. In another embodiment, the filter lens is a convex lens and further comprises an infrared absorbing dye. In another embodiment, the filter lens is a concave lens and further comprises an ultraviolet absorbing dye.

[0019] In one embodiment, the minimum transmittance of the filter lens for incident light in the wavelength range of 460nm to 560nm is greater than 80%. In another embodiment, the minimum transmittance of the filter lens for incident light in the wavelength range of 460nm to 560nm is greater than 85%.

[0020] In one embodiment, the maximum transmittance of the filter lens for incident light in the wavelength range of 830nm to 1200nm is less than 1%. In another embodiment, the maximum transmittance of the filter lens for incident light in the wavelength range of 830nm to 1200nm is less than 0.5%.

[0021] In one embodiment, the OD value of the filter lens for incident light wavelengths of 930 nm to 950 nm is greater than 4.5.

[0022] In one embodiment, the filter lens has a passband overlapping with the wavelength range of 350 nm to 850 nm, and the center wavelength of the passband is within the wavelength range of 350 nm to 850 nm.

[0023] The present invention further provides a method for preparing a filter lens, comprising:

[0024] A copper compound, a phosphonic acid as shown in Formula 1, and at least one phosphorus-containing compound as shown in Formula 2 to Formula 4 are prepared to form a composition containing a copper complex,

[0025]

[0026] Among them, R, R 1 , R 2 , R 3 are each independently substituted or unsubstituted C 1 To C 12 Alkyl or C 6 To C 12 Aryl; and

[0027] curing the composition to obtain a filter lens,

[0028] The OD value of the filter lens for incident light wavelengths from 930nm to 950nm is greater than 4.

[0029] In one embodiment, the curing step is to fill the composition into a mold and cure it to obtain a filter lens.

[0030] In one embodiment, the curing step is to coat the composition on a substrate and pattern the mixture using a photolithography process to obtain a filter lens.

[0031] In one embodiment, the curing molding is injection molding, heat pressing molding, vacuum molding or light curing.

[0032] In one embodiment, the curing time is less than 1 hour.

[0033] In one embodiment, the substituted or unsubstituted C 1 To C 12The alkyl group is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl and tert-butyl; substituted or unsubstituted C 6 To C 12 The aryl group is selected from the group consisting of phenyl, naphthyl and chlorophenyl.

[0034] In one embodiment, the filter lens has a haze of 0.4% or less.

[0035] In one embodiment, the X-ray photoelectron spectrum of the filter lens has at least one main peak at a binding energy of 930 eV to 940 eV. In another embodiment, the counts per second value of at least one main peak in the X-ray photoelectron spectrum of the filter lens is greater than 4500.

[0036] In one embodiment, the thickness of the filter lens is 25 μm to 150 μm.

[0037] In one embodiment, the filter lens further comprises an optical resin. In another embodiment, the optical resin is a thermoplastic resin and / or a photocurable resin. In another embodiment, the optical resin is selected from polycarbonates, polyesters, polycycloolefins, polyacrylic acids, silicone resins and polyimides. In another embodiment, the optical resin is methyl methacrylate.

[0038] The present invention first prepares a composition that can form a lens that efficiently absorbs incident light with a wavelength of 800nm ​​to 1100nm, more particularly excellently absorbs incident light with a wavelength of 940nm, and at the same time presents a very high transmittance to visible light, wherein the composition contains a copper complex that mainly contributes to near-infrared absorption. Therefore, the lens of the present invention has the function of filtering out near-infrared rays, so that additional filter components can be omitted, thereby reducing the size of the finished product assembled into an optical lens module. Furthermore, other additives that have a transmittance-reducing effect on specific wavelengths can be added to the lens, such as near-infrared absorbing dyes, ultraviolet absorbing dyes, etc., so that the lens can further filter out light of other specific wavelengths, further reducing the number of lenses that need to be matched and reducing the size of the finished product assembled into an optical lens module. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a side view of the schematic diagram of the structure of the filter lens of the present invention.

[0040] Figure 2 The figure is a schematic diagram of the process of preparing a filter lens according to the present invention.

[0041] Figures 3 to 5 FIG. 1 is a schematic diagram of another process for preparing a filter lens according to the present invention.

[0042] Figure 6 This is the X-ray photoelectron spectrum of the near infrared absorption layer in Preparation Example 1.

[0043] Wherein, the accompanying drawings are marked as follows:

[0044] 1: Filter lens 10: Composition

[0045] 11: Composition layer 20: Mold

[0046] 30: Substrate L: Light source

[0047] M: Mask. DETAILED DESCRIPTION

[0048] The following describes the implementation of the present invention through specific embodiments. A person skilled in the art can easily understand the scope and effect of the present invention based on the contents described herein.

[0049] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents described in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content described in the present invention. At the same time, the terms such as "upper", "first", "second", etc. cited in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0050] When “includes,” “comprising,” or “has” specific elements as described herein, unless otherwise stated, other elements, components, structures, regions, parts, devices, systems, steps, or connections may also be included, rather than excluding these other elements.

[0051] Unless clearly stated otherwise herein, the singular forms "a", "an" and "the" described herein also include plural forms, and "or" and "and / or" described herein are used interchangeably.

[0052] The numerical ranges described herein are inclusive and combinable, and any numerical value falling within the numerical range described herein can be used as the maximum value or the minimum value to derive its sub-range; for example, the numerical range of "25 to 200" should be understood to include any sub-range between endpoint 25 and endpoint 200, such as 25 to 150, 30 to 200, 30 to 150... and other sub-ranges; in addition, if a numerical value falls within the ranges described herein (such as between the maximum value and the minimum value), it should be deemed to be included in the scope of the present invention.

[0053] The first aspect of the present invention is a filter lens, comprising: a copper complex, wherein the copper complex is formed by a copper compound providing copper ions, a phosphonic acid as shown in Formula 1, and at least one phosphorus-containing compound as shown in Formula 2 to Formula 4,

[0054]

[0055] Among them, R, R 1 , R 2 , R 3 are each independently substituted or unsubstituted C 1 To C 12 Alkyl or C 6 To C 12 Aryl.

[0056] The copper complex can be chemically represented by Cu 2+ X represents, where Cu 2+ is provided by a copper compound, while X may be contributed by a phosphonic acid and / or a phosphorus-containing compound.

[0057] Alkyl groups include, but are not limited to, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, pentyl, etc., and examples of substituted alkyl groups include, but are not limited to, haloalkyl, hydroxyalkyl, nitroalkyl, alkoxyalkyl, etc. Aryl groups include, but are not limited to, phenyl, naphthyl, etc., and examples of substituted aryl groups include, but are not limited to, haloaryl (e.g., chlorophenyl), nitroaryl, hydroxyaryl, alkoxyaryl, alkylaryl, haloalkylaryl, nitroalkylaryl, hydroxyalkylaryl.

[0058] In one embodiment, the phosphonic acid is butylphosphonic acid.

[0059] The copper compound is mainly used as a supply source of copper ions, and a known copper compound that can provide copper ions can be used, such as a copper salt, which can be listed as copper acetate or a hydrate of copper acetate, and can also be listed as an anhydride or hydrate of copper chloride, copper formate, copper stearate, copper benzoate, copper pyrophosphate, copper naphthenate, and copper citrate. In one embodiment, the copper compound used to provide copper ions is copper acetate.

[0060] The phosphorus-containing compound can have a dispersing function, so that the components in the composition (including the formed copper complex) do not agglomerate with each other and achieve uniform dispersion. As one of the effects of this function, the crystallite size can be less than 100nm, further between 5nm and 80nm, or between 20nm and 60nm, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100nm. When the crystallite size is above 5nm, sufficient near-infrared absorption characteristics can be displayed; and when the crystallite size is below 100nm, the particle number average agglomerated particle size is small, and the product has a lower haze.

[0061] The copper complex of the present invention can be prepared from a near-infrared absorbing composition, which includes a copper compound, a phosphonic acid, and a phosphorus-containing compound, and the components interact and react with each other to form a copper complex. In the present invention, the proportion of each component can be adjusted as needed. For example, in the near-infrared absorbing composition, the copper compound used to provide copper ions can be 150 parts by weight, which can be listed as 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145 or 150 parts by weight. ; the phosphonic acid can be 100 parts by weight, which can be listed as 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, or 100 parts by weight; and the phosphorus-containing compound can be 1 to 90 parts by weight in total, which can be listed as 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85 or 90 parts by weight.

[0062] In one embodiment, the near-infrared absorbing composition includes the phosphorus-containing compounds shown in Formula 2 to Formula 4 at the same time, and the proportion can be adjusted according to the needs. For example, in the near-infrared absorbing composition, the phosphorus-containing compound shown in Formula 2 can be 1 to 90 parts by weight, the phosphorus-containing compound shown in Formula 3 can be 1 to 90 parts by weight, and the phosphorus-containing compound shown in Formula 4 can be 1 to 90 parts by weight, wherein the phosphorus-containing compounds shown in Formula 2 to Formula 4 can be listed as 1, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85 or 90 parts by weight. In another embodiment, the phosphorus-containing compound shown in Formula 2: the phosphorus-containing compound shown in Formula 3: the phosphorus-containing compound shown in Formula 4 is 20:20:50.

[0063] In one embodiment, the near infrared absorbing composition may be in the form of a dispersion, that is, in addition to the copper compound, phosphonic acid and phosphorus-containing compound, further comprising a solvent. During preparation, the copper compound, phosphonic acid and phosphorus-containing compound may be added to the solvent and mixed, and the ratio of these components to the solvent may be 1:5 to 1:1, for example 1:3, but not limited thereto.

[0064] The solvent may be a known solvent, including but not limited to water, alcohols, ketones, ethers, esters, aromatic hydrocarbons, halogenated hydrocarbons, dimethylformamide, dimethylacetamide, dimethyl sulfoxide, cyclopentane, etc. Specifically, alcohols include methanol, ethanol, propanol, etc. Esters include alkyl formates, alkyl acetates, alkyl propionates, alkyl butyrates, alkyl lactates, alkyl alkoxy acetates, alkyl 3-alkoxy propionates, alkyl 2-alkoxy propionates, alkyl 2-alkoxy-2-methyl propionates, alkyl pyruvates, alkyl acetoacetates, alkyl 2-oxobutyrates, etc. Examples of ethers include diethylene glycol dimethyl ether, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, propylene glycol monopropyl ether acetate, etc. Examples of ketones include methyl ethyl ketone, cyclohexanone, cyclopentanone, 2-heptanone, 3-heptanone, etc. Examples of aromatic hydrocarbons include toluene and xylene, etc.

[0065] Mixing, for example, stirring fully at room temperature (such as 25° C.), for example, stirring for more than 4 hours, more than 6 hours, or more than 8 hours, but not limited thereto.

[0066] In the present invention, the near infrared absorbing composition in the form of a dispersion can be mixed with an optical resin to subsequently form a filter lens. The ratio of the dispersion to the optical resin can be 5:1 to 1:1 or 3:1 to 1:1, such as 0.65:0.35, but is not limited thereto.

[0067] The optical resin may be a thermoplastic resin and / or a light-curable resin. In one embodiment, the optical resin is selected from polycarbonates, polyesters, polycycloolefins, polyacrylic acids, siloxane resins, and polyimides. In another embodiment, the optical resin is a siloxane resin. In another embodiment, the optical resin is methyl methacrylate.

[0068] In one embodiment, the near infrared absorbing composition may further be added with a polymerization initiator, such as a photopolymerization initiator, so that the optical resin can be polymerized by light irradiation. Known polymerization initiators can be used, including but not limited to azobisisobutyronitrile. In one embodiment, a solvent may also be added to facilitate uniform mixing, and known ones may be used, including but not limited to those mentioned herein. In one embodiment, in order to facilitate the curing process, a curing agent, such as a photocuring agent, may be further added, so that the film can be cured by light irradiation.

[0069] In one embodiment, other additives may be further included. For example, in order to further improve the optical performance of the filter lens, additives having a transmittance-reducing effect on specific wavelengths may be optionally added, including but not limited to additives having a transmittance-reducing effect on near infrared rays and ultraviolet rays. Reducing transmittance may be achieved, for example, by absorption, reflection, etc. In one embodiment, the additives include near infrared absorbing dyes and / or ultraviolet absorbing dyes.

[0070] Near infrared absorbing dyes such as azo compounds, diimmonium compounds, dithiol metal complexes, squaraine compounds, cyanine compounds and phthalocyanine compounds can adjust the maximum absorption wavelength to between 650 and 1100 nm, or more specifically between 650 and 750 nm. Ultraviolet absorbing dyes such as azomethine compounds, indole compounds, ketone compounds, benzimidazole compounds and triazine compounds.

[0071] In one embodiment, in order to maintain better light transmittance, the filter lens has a haze of less than 0.4%, 0.3% or 0.2%, for example, 0.4%, 0.35%, 0.3%, 0.25%, 0.2%, 0.19%, 0.18%, 0.17%, 0.16%, 0.15%, 0.14%, 0.13%, 0.12%, 0.11% or 0.1%.

[0072] The filter lens of the present invention has the function of filtering near infrared rays, and the thickness affects the characteristics of near infrared absorption. Generally speaking, as the thickness increases, the near infrared cutoff capability also increases, but it does not meet the requirements of thinness, and as the thickness decreases, the near infrared cutoff capability also decreases. In one embodiment, the filter lens of the present invention can achieve excellent near infrared cutoff capability even when it is very thin. Specifically, the thickness of the filter lens is between 25 μm and 150 μm, between 50 μm and 150 μm, or between 100 μm and 150 μm, for example, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm, 146 μm, 147 μm, or 150 μm.

[0073] In one embodiment, the X-ray photoelectron spectrum of the filter lens of the present invention has at least one main peak at a binding energy of 930 electron volts to 940 electron volts. In one embodiment, the counts per second of the at least one main peak is 4500 or more, 4600 or more, 4700 or more, 4800 or more, 4900 or more, or 5000 or more.

[0074] In one embodiment, the maximum transmittance of the filter lens of the present invention for incident light in the wavelength range of 930nm to 950nm (including incident light at 940nm) is 0.1% or less, less than 0.1%, less than 0.05%, less than 0.05%, less than 0.01%, less than 0.01%, less than 0.005% or less than 0.005%, for example, 0.1%, 0.09%, 0.08%, 0.07%, 0.06%, 0.05%, 0.04%, 0.03%, 0.02%, 0.01%, 0.009%, 0.008%, 0.007%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.05%, 0.06%, 0.07%, 0.08 ... 006%, 0.005%, 0.004%, 0.003%, 0.002%, 0.001%; ​​on the other hand, the OD value for the incident light wavelength range of 930nm to 950nm (including the incident light at 940nm) is 3 or more, greater than 3, greater than 3.5, greater than 3.5, greater than 4, greater than 4.5, or greater than 4.5, for example, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9.

[0075] In one embodiment, the filter lens of the present invention has a maximum transmittance of 1% or less or 0.5% or less for incident light in the wavelength range of 830nm to 1200nm, such as 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2% or 0.1%; and a minimum transmittance of 80% or more or 85% or more for incident light in the wavelength range of 460nm to 560nm, such as 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89% or 90%.

[0076] In one embodiment, the filter lens of the present invention has a passband overlapping with the wavelength range of 300nm to 850nm, 300nm to 800nm, or 350nm to 750nm, and the center wavelength of the passband is located in the wavelength range of 300nm to 850nm, 300nm to 800nm, 350nm to 750nm, 400nm to 700nm, 450nm to 650nm, 500nm to 600nm, or 500nm to 550nm. Herein, "passband" refers to a segment in which the transmittance of incident light within the wavelength range is 50% or more, and "the center wavelength of the passband" refers to the average value of two incident light wavelengths corresponding to the transmittance of 50% for the incident light.

[0077] In one embodiment, the filter lens can be a concave lens, a convex lens, a convex-concave lens or a plane lens according to the requirements. The concave lens means that the filter lens has a first surface and a second surface opposite to each other, and at least one of the first surface and the second surface is sunken inward to become a concave surface; the convex lens means that at least one of the first surface and the second surface protrudes outward to become a convex surface; the convex-concave lens means that one of the first surface and the second surface protrudes outward to become a convex surface, and the other is sunken inward to become a concave surface; and the plane lens means that both the first surface and the second surface are planes. For example, the filter lens can be as follows Figure 1 The examples shown are, from right to left, a plane lens, a plano-convex lens, a plano-concave lens, a biconvex lens, and a biconcave lens. An optical lens module includes at least one lens, usually one, two, three, four, five, six or more lenses, which is called a lens group, and the filter lens of the present invention can be used as a lens in the lens group.

[0078] The filter lens of the present invention can be in a specific shape and have specific optical properties according to requirements. For example, in one embodiment, the filter lens is a convex lens and further includes an infrared absorbing dye; in another embodiment, the filter lens is a concave lens and further includes an ultraviolet absorbing dye.

[0079] A second aspect of the present invention is a method for preparing a filter lens, comprising:

[0080] Prepare a copper compound, a phosphonic acid as shown in Formula 1, and at least one phosphorus-containing compound as shown in Formulas 2 to 4, and form a composition containing a copper complex;

[0081]

[0082] Among them, R, R 1 , R 2 , R 3 are each independently substituted or unsubstituted C 1 To C 12 Alkyl or C 6 To C 12 Aryl; and

[0083] curing the mixture to obtain a filter lens,

[0084] The OD value of the filter lens for incident light wavelengths from 930nm to 950nm is greater than 4.

[0085] The copper compound, phosphonic acid, and phosphorus-containing compound described in the second aspect of this document are those described in the first aspect of this document.

[0086] For example, to prepare the composition, a copper compound, a phosphonic acid, and a phosphorus-containing compound for providing copper ions may be prepared first, and then mixed with a solvent to form a dispersion. The solvent is as described in the first aspect of this invention. The mixing here may, for example, first mix the copper compound and the solvent to form a first liquid, and then mix the phosphorus-containing compound and the solvent to form a second liquid, and then mix the first liquid and the second liquid and then mix the phosphonic acid to form a composition. Here, during the mixing process, a copper complex is formed in the composition due to the reaction and interaction of each component.

[0087] The composition may further include an optical resin, for example, after the first liquid and the second liquid are mixed and the phosphonic acid is mixed, the optical resin may be further mixed. The optical resin is as described in the first aspect of this invention.

[0088] In one embodiment, the semi-finished product of mixing the first liquid and the second liquid and then mixing the phosphonic acid is first dried into powder, then the powder is added to the second solvent and then mixed with the optical resin to form a composition. The second solvent can be selected from the solvent types described in the first aspect of this invention.

[0089] In the case of adding other additives, such as polymerization initiators, curing agents, optical property promoters that have the ability to reduce the transmittance of light of a specific wavelength (such as near-infrared absorbing dyes, ultraviolet absorbing dyes), etc., they can be optionally added to the composition, for example, added to the mixed liquid before mixing with the optical resin, and mixed with the optical resin together with the mixed liquid, or added after the mixed liquid is mixed with the optical resin.

[0090] The method for preparing a filter lens of the present invention includes the step of curing the mixture. The curing method is not limited in the present invention. As long as the composition can be cured to form a filter lens of a desired shape and with desired optical properties, it should be included in the scope of the present invention.

[0091] Figure 2 Schematic diagram of one embodiment of the curing composition of the present invention, wherein the composition 10 is filled into a mold 20 for curing. Here, the mold is filled for curing, such as injection molding, hot pressing molding, vacuum molding, etc. A transparent mold may also be used, and after the composition is filled, it is irradiated with light for light curing. The duration of curing, in one embodiment, is within 1 hour, including but not limited to 1 hour, 50, 45, 40, 35, 30, 20, 10, 5, 4, 3, 2, 1.5, 1 minute.

[0092] Figures 3 to 5 FIG. 2 is a schematic diagram of another embodiment of the curing composition of the present invention. Figure 3 As shown, the composition 10 is coated on the surface of the substrate 30 to form a composition layer 11. Bubbles in the mixture can be removed before coating, or after coating, and the method of removing bubbles is not limited, such as ultrasonic vibration, placing in a negative pressure environment, or both. In addition, the coating is also not limited, for example, it can be coated by spin coating, spray coating, blade coating, roll coating, dipping, etc.

[0093] Next reference Figure 4 The composition layer 11 is irradiated with a light source L for light curing, and a mask M, such as a grayscale mask, is arranged between the light source L and the composition layer 11, thereby introducing a photolithography process, which specifically allows the composition layer 11 under the mask M to be selectively exposed and cured, so as to Figure 5 As shown, a filter lens 1 having a specific pattern or a specific shape can be obtained. The specific pattern or the specific shape can be designed according to the requirements of the mask and the composition can be formulated accordingly, and can be a convex lens, a concave lens or a flat lens as described herein, for example Figure 1 Those exemplified.

[0094] In another embodiment, the composition can be coated on the surface of the substrate as described above, except that in this embodiment, the composition is directly cured into a film, and then the film is processed to make the first surface and / or the second surface of the film flat, convex or concave, thereby obtaining a filter lens. The processing includes but is not limited to etching, laser cutting, grinding, etc.

[0095] In another embodiment, the composition is dried (eg, dried at 120° C.) to remove the solvent prior to curing.

[0096] The present invention will be described in further detail with reference to the following specific examples, which are however by no means intended to limit the scope of the present invention.

[0097] Preparation Example 1

[0098] 150 parts by weight of copper acetate and 15,000 parts by weight of ethanol were mixed and stirred at room temperature for 1.5 hours to form a first mixed solution; 20 parts by weight of the phosphorus-containing compound shown in formula 2 (plysurf A242G, purchased from Japan Daiichi Industry Pharmaceutical Co., Ltd.), 20 parts by weight of the phosphorus-containing compound shown in formula 3 (plysurf W542C, purchased from Japan Daiichi Industry Pharmaceutical Co., Ltd.) and 50 parts by weight of the phosphorus-containing compound shown in formula 4 (plysurf A285C, purchased from Japan Daiichi Industry Pharmaceutical Co., Ltd.) were mixed with 1,500 parts by weight of ethanol to form a second mixed solution. The first mixed solution and the second mixed solution were mixed and stirred at room temperature for 1 hour, and then 100 parts by weight of butylphosphonic acid were added and stirred at room temperature for 3 hours. Then, the mixture was placed in an oven at 85°C for 12 hours to obtain a powder. The powder and xylene are mixed in a weight ratio of 1:3 to form a dispersion, and the dispersion is then mixed with methyl methacrylate (MMA) in a weight ratio of 0.65:0.35 to form a composition, which is then coated on a substrate and baked at 70°C for 30 minutes to obtain a near-infrared absorption layer.

[0099] The near infrared absorbing layer is subjected to X-ray photoelectron (ESCA / XPS) analysis, and its X-ray photoelectron spectrum is as follows: Figure 6 It can be observed that the characteristic peaks associated with copper complexes (Cu(PO x ) y , CuO, Cu 2 O、Cu(OH) 2 ). In addition, the peak that appears when the binding energy is above 940 eV is a satellite peak.

[0100] Example 1

[0101] The dispersion and the composition were prepared according to the method of Preparation Example 1, and then the bubbles in the mixture were removed by ultrasonic vibration under negative pressure, and then the mixture was injected into a mold. Figure 2 The example has a cavity inside which a double convex lens can be formed. The curing is carried out at 180°C for 1 hour, and finally the film is cooled and demolded to obtain a filter double convex lens.

[0102] Example 2

[0103] The dispersion and the composition were prepared according to the method of Preparation Example 1, but 0.5 g of azobisisobutyronitrile (AIBN) as a photopolymerization initiator and an appropriate amount of solvent propylene glycol monomethyl ether (PGME) were additionally added, and then the bubbles in the composition were removed by ultrasonic vibration under a negative pressure environment, and then the composition layer was spin-coated on the substrate. The solvent was removed by baking at 120° C., a grayscale mask was set above the composition layer, and an ultraviolet light source was set above the grayscale mask, so that the composition layer was selectively exposed and patterned to obtain a filter plano-convex lens.

[0104] The above-mentioned implementation modes and specific examples are not intended to limit the present invention. The listed technical features or schemes can be combined with each other. The present invention can also be implemented or applied through other different implementation modes. The details recorded in this document can also be given different changes or modifications according to different viewpoints and applications without departing from the present invention.

Claims

1. A filter lens, characterized in that: include: A copper complex formed by a copper compound providing copper ions, a phosphonic acid as shown in Formula 1 and at least one phosphorus-containing compound as shown in Formula 2 to Formula 4, wherein R, R1, R2, and R3 are each independently substituted or unsubstituted C1 to C 12 Alkyl or C6 to C 12 Aryl; Wherein, the OD value of the filter lens for incident light wavelengths of 930nm to 950nm is greater than 4.

2. The filter lens according to claim 1, characterized in that: The substituted or unsubstituted C1 to C 12 The alkyl group is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl and tert-butyl; the substituted or unsubstituted C6 to C 12 The aryl group is selected from the group consisting of phenyl, naphthyl and chlorophenyl.

3. The filter lens according to claim 1, characterized in that: It has a haze of 0.4% or less.

4. The filter lens according to claim 1, characterized in that: Its X-ray photoelectron spectrum has at least one main peak when the binding energy is 930 electron volts to 940 electron volts.

5. The filter lens according to claim 4, characterized in that: The counts per second of the at least one main peak is greater than 4500.

6. The filter lens according to claim 1, characterized in that: Its thickness is 25 μm to 150 μm.

7. The filter lens according to claim 1, characterized in that: It also includes an optical resin, wherein the optical resin is a thermoplastic resin and / or a photocurable resin, and the optical resin is selected from polycarbonate, polyester, polycycloolefin, polyacrylic acid, siloxane resin and polyimide.

8. The filter lens according to claim 7, characterized in that: The optical resin is methyl methacrylate.

9. The filter lens according to claim 1, characterized in that: Also included are infrared absorbing dyes and / or ultraviolet absorbing dyes.

10. The filter lens according to claim 1, characterized in that: It is a concave lens, a convex lens, a convex-concave lens or a flat lens.

11. A method for preparing a filter lens, characterized in that: include: A copper compound, a phosphonic acid as shown in Formula 1, and at least one phosphorus-containing compound as shown in Formula 2 to Formula 4 are prepared to form a composition containing a copper complex, wherein R, R1, R2, and R3 are each independently substituted or unsubstituted C1 to C 12 Alkyl or C6 to C 12 Aryl; and curing the composition to obtain a filter lens, Wherein, the OD value of the filter lens for incident light wavelengths of 930nm to 950nm is greater than 4.

12. The method according to claim 11, characterized in that The curing step is to fill the composition into a mold and cure it to obtain a filter lens.

13. The method according to claim 11, characterized in that The curing step is to coat the composition on a substrate and pattern the mixture using a photolithography process to obtain a filter lens.

14. The method according to claim 12, characterized in that The curing molding is injection molding, hot pressing molding, vacuum molding or light curing.

15. The method according to claim 12, characterized in that The curing process takes less than 1 hour.

16. The method according to claim 11, characterized in that The substituted or unsubstituted C1 to C 12 The alkyl group is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl and tert-butyl; the substituted or unsubstituted C6 to C 12 The aryl group is selected from the group consisting of phenyl, naphthyl and chlorophenyl.

17. The method according to claim 11, characterized in that It has a haze of 0.4% or less.

18. The method according to claim 11, characterized in that Its X-ray photoelectron spectrum has at least one main peak when the binding energy is 930 electron volts to 940 electron volts.

19. The method according to claim 18, characterized in that The counts per second of the at least one main peak is greater than 4500.

20. The method according to claim 11, characterized in that Its thickness is 25 μm to 150 μm.

21. The method according to claim 11, characterized in that It also includes an optical resin, wherein the optical resin is a thermoplastic resin and / or a photocurable resin, and the optical resin is selected from polycarbonate, polyester, polycycloolefin, polyacrylic acid, siloxane resin and polyimide.

22. The method according to claim 11, characterized in that The optical resin is methyl methacrylate.

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