Lens module with integrated framework

Abstract

The invention discloses a lens module with an integrated framework, which comprises a first lens, a second lens, a first substrate, a second substrate, an optical bonding layer, a first absorption layer and a second absorption layer, the copper complex is formed from a copper compound with 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. According to the lens module, the size can be reduced due to the adoption of an integrated framework, and the process is simplified without assembly. The lens module shows high transmittance to visible light and low transmittance to near infrared rays, and has an excellent near infrared ray cut-off effect. In addition, when the incident light irradiates the lens module at different angles, the transmittance curve only has small deviation.

Description

Technical Field

[0001] The present invention relates to a lens module, and in particular to a lens module with an integrated structure by integrating independently arranged components in the lens module. Background Art

[0002] A known lens module includes multiple components, such as lenses, filters, photosensitive elements, etc. The photosensitive components can be designed to detect light of different wavelengths for different applications, such as infrared (applicable to 3D detection), visible light (applicable to general cameras or video cameras), ultraviolet light (applicable to self-driving lidar lenses) and X-rays (applicable to digital filmless X-ray machines).

[0003] In the application of general cameras or video cameras, the photosensitive element mainly detects within the range of visible light and part of the near-infrared light. However, it is expected that the photosensitive element only detects visible light, and the near-infrared light is regarded as interference to the image. For this reason, an independent filter is usually set on the light-incident side of the lens module, which has a high absorption rate for near-infrared light and a high transmittance for light of other wavelengths, so as to achieve the purpose of filtering out near-infrared light. However, when the incident angle of the incident light changes, the transmittance of the existing filter shifts, and the shift is positively correlated with the incident angle, which may cause color deviation when the incident light is incident at a large angle, and may even cause the detection instrument to misjudge the value. Therefore, it is expected to maintain consistent optical performance when the incident angle changes.

[0004] In addition, the lens module must increase in size due to the space required to accommodate the filter. On the other hand, the lens in the lens module is usually a lens group that includes a series of lenses, which adjusts the focal length through a focus motor so that the light is focused on the photosensitive element to form an image. As the market pursues complex and diverse photo modes and higher and higher image quality, the number and thickness of lenses in the lens group have increased, causing the size of the lens module to deviate from the trend of device miniaturization. The problem of lens module size has been reflected in mobile phones. It can be observed that mobile phones generally have lenses that bulge outward, even for high-end mobile phones, increasing the risk of bumps and damage. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a lens module with an integrated structure, which includes:

[0006] The first lens and the second lens are respectively located at the outermost sides of the lens module;

[0007] A first substrate and a second substrate, which are respectively disposed on the first lens and the second lens;

[0008] an optical bonding layer, disposed on the first substrate or the second substrate and located between the first substrate and the second substrate; and

[0009] The first absorption layer and the second absorption layer are located between the optical bonding layer and the first substrate or the second substrate,

[0010] Wherein, the first absorption layer comprises:

[0011] A copper complex formed by a copper compound for providing copper ions, a phosphonic acid as shown in Formula 1 and at least one phosphorus-containing compound as shown in Formulas 2 to 4,

[0012]

[0013] Among them, R, R 1 , R 2 , R 3 are each independently substituted or unsubstituted C 1 To C 12 Alkyl or substituted or unsubstituted C 6 To C 12 Aryl,

[0014] The OD value of the first absorption layer for incident light wavelengths from 930nm to 950nm is greater than 4.

[0015] The second absorption layer includes an infrared absorption dye and an ultraviolet absorption dye.

[0016] 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.

[0017] In one embodiment, the first absorbing layer has a haze of 0.4% or less.

[0018] In one embodiment, the X-ray photoelectron spectrum of the first absorption layer 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 first absorption layer is greater than 4500.

[0019] In one embodiment, the first absorption layer has a thickness of 25 μm to 150 μm.

[0020] In one embodiment, the minimum transmittance of the first absorption layer to incident light in the wavelength range of 460nm to 560nm is 80% or more. In another embodiment, the minimum transmittance of the first absorption layer to incident light in the wavelength range of 460nm to 560nm is 85% or more.

[0021] In one embodiment, the maximum transmittance of the first absorption layer for incident light in the wavelength range of 830 nm to 1200 nm is 1% or less. In another embodiment, the maximum transmittance of the first absorption layer for incident light in the wavelength range of 830 nm to 1200 nm is 0.5% or less.

[0022] In one embodiment, the first absorbing layer 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, siloxane resins and polyimides. In another embodiment, the optical resin is methyl methacrylate.

[0023] In one embodiment, the optical bonding layer is an optical tape or an optical adhesive.

[0024] In one embodiment, the first substrate and the second substrate are made of glass.

[0025] In one embodiment, the material of the first lens and the second lens is selected from glass, polycarbonate and polyacrylate.

[0026] In one embodiment, the second absorbing layer includes at least one sublayer including an infrared absorbing dye and at least one sublayer including an ultraviolet absorbing dye.

[0027] In one embodiment, the near infrared absorbing dye is at least one selected from the group consisting of azo compounds, diimmonium compounds, dithiol metal complexes, squaraine compounds, cyanine compounds, and phthalocyanine compounds.

[0028] In one embodiment, the ultraviolet absorbing dye is at least one selected from the group consisting of azomethine compounds, indole compounds, ketone compounds, benzimidazole compounds and triazine compounds.

[0029] In one embodiment, the lens module of the present invention further includes a spacer material, which is disposed on the first substrate or the second substrate and surrounds the optical bonding layer.

[0030] In one embodiment, the OD value of the lens module of the present invention to the incident light wavelength of 940 nm is greater than 4. In another embodiment, the OD value of the lens module of the present invention to the incident light wavelength of 940 nm is greater than 4.5.

[0031] In one embodiment, the lens module of the present invention has a haze of less than 0.5%.

[0032] In one embodiment, the maximum transmittance of the lens module of the present invention for incident light wavelengths ranging from 930nm to 950nm is less than 0.01%. In another embodiment, the maximum transmittance of the lens module of the present invention for incident light wavelengths ranging from 930nm to 950nm is less than 0.005%.

[0033] In one embodiment, the minimum transmittance of the lens module of the present invention for incident light in the wavelength range of 460nm to 560nm is greater than 80%. In another embodiment, the minimum transmittance of the lens module of the present invention for incident light in the wavelength range of 460nm to 560nm is greater than 85%.

[0034] In one embodiment, the lens module of the present invention has a passband that overlaps with the wavelength range of 350nm to 850nm, and the center wavelength of the passband is within the wavelength range of 350nm to 850nm.

[0035] In one embodiment, when the incident light irradiates the lens module of the present invention at an incident angle of 0 degree and 30 degree, the central wavelength of the passband is shifted, and the shift amplitude is less than 1.4nm. In one embodiment, when the incident light irradiates the lens module of the present invention at an incident angle of 0 degree and 35 degree, the central wavelength of the passband is shifted, and the shift amplitude is less than 1.9nm.

[0036] The lens module of the present invention can reduce the size due to its integrated structure, and does not require assembly, thereby simplifying the process. The lens module of the present invention exhibits high transmittance for visible light and low transmittance for near-infrared light, and more particularly has excellent absorptivity for near-infrared light with a wavelength of 940nm, exhibiting an excellent near-infrared cutoff effect. In addition, when the incident light is irradiated to the lens module of the present invention at different angles, the transmittance curve has only a slight shift.

[0037] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the lens module of the present invention.

[0039] Figure 2 FIG. 4 is another structural schematic diagram of the lens module of the present invention.

[0040] Figure 3 This is the X-ray photoelectron spectrum of the first absorption layer in Preparation Example 1.

[0041] Figure 4The transmittance curves of three implementation schemes are blue glass, blue glass + second absorption layer, and blue glass + first absorption layer + second absorption layer.

[0042] Figure 5 1 is a transmittance curve diagram of Example 1 and Comparative Example 1.

[0043] Figure 6 It is a transmittance curve diagram of Example 2 and Comparative Example 1.

[0044] Figure 7 It is a transmittance curve diagram of Example 3 and Comparative Example 1.

[0045] Figure 8 It is a transmittance curve diagram of Example 4 and Comparative Example 1.

[0046] Fig. 9 OD value curves of Examples 1 to 4 for incident light wavelengths of 930nm to 950nm.

[0047] Fig.10 The transmittance curves of Example 1 are shown when the incident angles are 0 degrees, 30 degrees, and 35 degrees, respectively.

[0048] Fig.11 The transmittance curves of Example 3 are shown when the incident angles are 0 degrees, 30 degrees, and 35 degrees, respectively.

[0049] Among them, the main component symbols are as follows:

[0050] 11First substrate

[0051] 12 Second substrate

[0052] 13. First absorption layer

[0053] 14 Second absorption layer

[0054] 21First lens

[0055] 22 Second lens

[0056] 31 Optical bonding layer

[0057] 32 Spacer material DETAILED DESCRIPTION

[0058] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand the scope and effect of the present invention based on the contents described herein.

[0059] 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 modification of the structure, change in the proportion relationship, or adjustment of the 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] The lens module with an integrated structure of the present invention comprises first and second lenses, first and second substrates, an optical bonding layer, and first and second absorption layers.

[0064] First reference Figure 1 , which is a schematic diagram of the structure of an embodiment of the lens module of the present invention. In the integrated structure of the lens module: the first lens 21 and the second lens 22 are respectively located at the outermost sides; the first substrate 11 and the second substrate 12 are respectively arranged on the first lens 21 and the second lens 22; the optical bonding layer 31 is bonded to the second substrate 12 and is located between the first substrate 11 and the second substrate 12; the first absorption layer 13 and the second absorption layer 14 are located between the optical bonding layer 31 and the first substrate 11. In this embodiment, the layers from bottom to top are: the first lens 21, the first substrate 11, the first absorption layer 13, the second absorption layer 14, the optical bonding layer 31, the second substrate 12, and the second lens 22.

[0065] Additional references Figure 2 , which is a structural schematic diagram of another embodiment of the lens module of the present invention, and Figure 1 The difference is that the positions of the first absorption layer 13 and the second absorption layer 14 are swapped. In this embodiment, the layers from bottom to top are: first lens 21, first substrate 11, second absorption layer 14, first absorption layer 13, optical bonding layer 31, second substrate 12, second lens 22.

[0066] As another embodiment, the optical bonding layer may also be bonded to the first substrate.

[0067] As another embodiment, the lens module further includes a spacer material, which is arranged around the optical bonding layer. Figure 1 and Figure 2 As shown, the optical bonding layer 31 is bonded to the second substrate 12, and the spacing material 32 is also formed on the second substrate 12 and surrounds the optical bonding layer 31. In the case where the optical bonding layer can be bonded to the first substrate, the spacing material is also formed on the first substrate and surrounds the optical bonding layer.

[0068] In one embodiment, the first absorption layer is a near-infrared absorption layer, which includes a copper complex having near-infrared absorption function. The copper complex can be formed by a copper compound for 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.

[0069]

[0070] Among them, R, R 1 , R 2 , R 3 are each independently substituted or unsubstituted C 1 To C 12 Alkyl or substituted or unsubstituted C 6 To C 12 Aryl.

[0071] The copper complex may be of the chemical formula Cu 2+ X represents, where Cu 2+ is provided by the copper compound and X is contributed by the phosphonic acid and / or phosphorus-containing compound.

[0072] 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.

[0073] In one embodiment, the phosphonic acid is butylphosphonic acid.

[0074] 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.

[0075] 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. One of the effects of this function is that 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.

[0076] The copper complex of the present invention can be prepared from a near-infrared absorbing composition, which includes the above-mentioned copper compound, phosphonic acid and phosphorus-containing compound, and each component interacts and reacts 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] The mixing may be, for example, sufficiently stirring at room temperature (eg, 25° C.), for example, stirring for more than 4 hours, more than 6 hours, or more than 8 hours, but is not limited thereto.

[0081] In the present invention, the near-infrared absorbing composition in the form of a dispersion liquid can be mixed with an optical resin to form a near-infrared absorbing composition in the form of a coating liquid to subsequently form a first absorbing layer. The ratio of the dispersion liquid to the optical resin can be 5:1 to 1:1 or 3:1 to 1:1, for example, 0.65:0.35, but is not limited thereto. When the near-infrared absorbing composition in the form of a coating liquid is used, it is formed on a substrate and dried and cured to form a first absorbing layer.

[0082] 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.

[0083] In one embodiment, the near infrared absorbing composition may be added with other additives, such as a polymerization initiator, such as a photopolymerization initiator, so that the optical resin can be polymerized by light irradiation, and the polymerization initiator includes but is not limited to azobisisobutyronitrile. In one embodiment, the additive is such as a curing agent to facilitate the curing process, and the curing agent is such as a photocuring agent, so that it can be cured into a film by light irradiation. In one embodiment, a solvent may also be added to facilitate uniform mixing. The solvent here can use those known, including but not limited to those mentioned herein.

[0084] In one embodiment, in order to maintain better light transmittance, the first absorption layer 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%.

[0085] The thickness of the first absorption layer also affects the characteristics of near-infrared absorption. Generally speaking, as the thickness of the first absorption layer increases, the near-infrared cutoff ability also increases, and vice versa, the near-infrared cutoff ability decreases. The first absorption layer of the present invention can achieve excellent near-infrared cutoff ability even when it is very thin. Specifically, the thickness of the first absorption layer is between 25 μm and 150 μm, between 50 μm and 150 μm, or between 100 μm and 150 μm, such as 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.

[0086] In one embodiment, the X-ray photoelectron spectrum of the first absorption layer 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.

[0087] In one embodiment, the maximum transmittance of the first absorption layer 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%, 0.05%, less than 0.05%, 0.01%, less than 0.01%, 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%, 0.0008%, 0.007%, 0.01%, 0.001% or less. .0006%, 0.005%, 0.004%, 0.003%, 0.002% or 0.001%; ​​on the other hand, the OD value for the incident light wavelength range of 930nm to 950nm (including the incident light of 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.

[0088] In one embodiment, the maximum transmittance of the first absorption layer of the present invention for incident light in the wavelength range of 830nm to 1200nm is less than 1% or less than 0.5%, for example, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2% or 0.1%; and the minimum transmittance for incident light in the wavelength range of 460nm to 560nm is more than 80% or more than 85%, for example, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89% or 90%.

[0089] In one embodiment, the first absorption layer has a passband overlapping with a wavelength range of 300nm to 850nm, 300nm to 800nm, or 350nm to 750nm, and the center wavelength of the passband is within a 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 where 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 a transmittance of 50% for incident light.

[0090] The second absorption layer is used to assist the first absorption layer, so that the lens module with an integrated structure of the present invention exhibits better optical performance, for example, further improving the cutoff of near-infrared and ultraviolet rays. In one embodiment, the second absorption layer includes a near-infrared absorbing dye and / or an ultraviolet absorbing dye. In one embodiment, the second absorption layer includes a plurality of sublayers, at least one of which includes an infrared absorbing dye and at least one includes an ultraviolet absorbing dye. In the case where the second absorption layer includes a plurality of sublayers, the arrangement order of the near-infrared absorbing dye layer and the ultraviolet absorbing dye layer is not limited, for example, the near-infrared absorbing dye layer can be arranged near the light incident side and the ultraviolet absorbing dye layer can be arranged near the photosensitive side; or the ultraviolet absorbing dye layer can be arranged near the light incident side and the near-infrared absorbing dye layer can be arranged near the photosensitive side.

[0091] In one embodiment, the second absorption layer has a thickness of 0.5 μm to 10 μm, such as 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm. When the second absorption layer is a multi-layer structure, the thickness of each layer is 0.5 μm to 10 μm, such as 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm.

[0092] In one embodiment, the second absorption layer may include a transparent resin material, including but not limited to epoxy resin, polyurethane, polyacrylate, polyolefin, polycarbonate, polycycloolefin and polyvinyl butyral, and the resin material may serve as a substrate for the second absorption layer. In one embodiment, the average transmittance or minimum transmittance of the transparent resin material to visible light (e.g., 460nm to 560nm wavelength) is 85% or more, and further 90% or more, including but not limited to 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94% or 95%.

[0093] In one embodiment, near infrared absorbing dyes such as azo compounds, diimmonium compounds, dithiol metal complexes, squaric acid 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.

[0094] The first substrate and the second substrate provide support for the first absorption layer, the second absorption layer and the optical bonding layer, and can also be used to assist the first absorption layer to exhibit better optical properties like the above-mentioned second absorption layer, for example, to further improve the cutoff of near infrared rays and ultraviolet rays. In one embodiment, the first substrate and the second substrate can be glass, specifically, transparent glass (such as AF glass) or blue glass. When blue glass is selected, the first substrate and the second substrate can exhibit a cutoff effect on near infrared rays. Blue glass is, for example, phosphate glass, such as blue glass formed by materials such as metaphosphate compounds, carbonate compounds, metal oxides and metal fluorides, wherein metaphosphate compounds include but are not limited to aluminum metaphosphate, magnesium metaphosphate, lithium metaphosphate, zinc metaphosphate and calcium metaphosphate, carbonate compounds include but are not limited to calcium carbonate, barium carbonate and strontium carbonate, metal oxides include but are not limited to copper oxide, aluminum oxide, zinc oxide and magnesium oxide, and metal fluorides include but are not limited to aluminum fluoride, magnesium fluoride, calcium fluoride, strontium fluoride, barium fluoride and zinc fluoride. The glass raw materials can be mixed evenly and placed in a crucible, and then the crucible is placed in a furnace containing air or reducing atmosphere, and the temperature is controlled between 700° C. and 1000° C. to obtain homogenized glass.

[0095] In one embodiment, the first substrate and / or the second substrate is blue glass, wherein the molar ratio of phosphorus / (aluminum+lanthanum+niobium+yttrium) is 1.5 to 16, and the molar ratio of fluorine / (fluorine+oxygen) is 0.01 to 0.2. In one embodiment, the blue glass contains 35 to 55 mol% of phosphorus, 3.5 to 15 mol% of aluminum, 15 to 25 mol% of alkali metals, 10 to 35 mol% of alkaline earth metals and divalent metals, 10 to 21 mol% of copper, and 0 to 7 mol% of the total of lanthanum+niobium+yttrium, wherein the molar ratio of copper / phosphorus is 0.25 to 0.7, and the molar ratio of fluorine / (fluorine+oxygen) is 0.01 to 0.2.

[0096] In one embodiment, the thickness of the first substrate and / or the second substrate is between 200μm and 500μm, between 200μm and 400μm or between 200μm and 300μm, for example 200μm, 225μm, 250μm, 275μm, 300μm, 325μm, 350μm, 375μm, 400μm, 425μm, 450μm, 475μm or 500μm.

[0097] The first lens and the second lens can be made of materials, compositions and shapes known in the art, and are not limited in the present invention. Any lens module with an integrated structure that can be integrated into the present invention should be included in the scope of the present invention. In one embodiment, the materials of the first lens and the second lens can be glass, polycarbonate, polyacrylate, etc.

[0098] The optical bonding layer can be any material and composition known in the art, and is not limited in the present invention. Any material that can be used to bond the first or second substrate to the first or second absorption layer thereon should be included in the scope of the present invention. In one embodiment, the optical bonding layer can be an optical tape or an optical adhesive. In one embodiment, the material of the optical bonding layer has a refractive index that matches the first or second substrate to be bonded, so as to reduce the loss and refraction of incident light at the interface.

[0099] The spacer material can be any material and composition known in the art, and is not limited in the present invention. In addition to serving as the boundary of the optical bonding layer, the spacer material can also serve as a cutting mark during the mass production of the lens module of the present invention, for example, coating, configuring, and cutting on a large-area substrate (such as a wafer) to simultaneously produce lens modules.

[0100] In one embodiment, the lens module of the present invention has a haze of less than 0.5%, 0.4% or 0.3%, for example, 0.5%, 0.45%, 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%.

[0101] In one embodiment, the maximum transmittance of the lens module of the present invention for incident light in the wavelength range of 930nm to 950nm (including incident light at 940nm) is 0.01% or less, less than 0.01%, 0.005% or less, or less than 0.005%, for example, 0.01%, 0.009%, 0.008%, 0.007%, 0.006%, 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 of 940nm) is greater than 4, greater than 4, greater than 4.5, greater than 4.5, greater than 4.8, or greater than 4.8, for example, 4, 4.01, 4.1, 4.2, 4.3, 4.4, 4.5, 4.51, 4.6, 4.7, 4.8, 4.81, 4.9.

[0102] In one embodiment, the maximum transmittance of the lens module of the present invention for incident light in the wavelength range of 830nm to 1200nm is less than 1% or less than 0.5%, for example, 1%, 0.9%, 0.8%, 0.7%, 0.6%, 0.5%, 0.4%, 0.3%, 0.2% or 0.1%; and the minimum transmittance for incident light in the wavelength range of 460nm to 560nm is more than 80% or more than 85%, for example, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89% or 90%.

[0103] In one embodiment, the lens module of the present invention has a passband overlapping with a wavelength range of 300nm to 850nm, 300nm to 800nm, or 350nm to 750nm, and the center wavelength of the passband is within a 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.

[0104] In one embodiment, when the incident light irradiates the lens module of the present invention at an incident angle of 0 degree and 30 degree, the central wavelength of the passband is shifted, and the shift amplitude is less than 1.4nm, such as 1.4nm, 1.3nm, 1.2nm or 1.1nm. In one embodiment, when the incident light irradiates the lens module at an incident angle of 0 degree and 35 degree, the central wavelength of the passband is shifted, and the shift amplitude is less than 1.9nm, such as 1.9nm, 1.8nm or 1.7nm.

[0105] 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.

[0106] Example

[0107] A large area of ​​blue glass is used as the first substrate, and a first absorption layer is formed thereon, followed by a second absorption layer. Then, a spacing material is arranged on the second absorption layer to configure a spacing area, and then an optical glue is filled in the spacing area, and finally, the large area of ​​blue glass as the first substrate is covered. Resin layers are formed on the outer sides of the first substrate and the second substrate, respectively, and the resin layers are processed to form a first lens and a second lens with specific shapes. Finally, a cutting step is performed to obtain a lens module with an integrated structure.

[0108] Preparation Example

[0109] First absorbent layer

[0110] 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 is mixed with xylene 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 coating solution, which is then coated on a substrate and baked at 70°C for 30 minutes to obtain a first absorption layer.

[0111] The first absorption layer is subjected to X-ray photoelectron (ESCA / XPS) analysis, and its X-ray photoelectron spectrum is as follows: Figure 3 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.

[0112] Second absorbent layer

[0113] 0.02 g of a square acid compound and a cyanine compound as infrared absorbing dyes were added to 5 g of epoxy resin, coated on a substrate, and baked at 70°C for 30 minutes to obtain a sublayer including a near-infrared absorbing dye; 0.02 g of a triazine compound as an ultraviolet absorbing dye was added to 5 g of epoxy resin, coated on the sublayer including the near-infrared absorbing dye, and baked at 70°C for 30 minutes to obtain a sublayer including an ultraviolet absorbing dye. This double layer was used as a second absorption layer.

[0114] Comparison of transmittance curves

[0115] First, the second absorption layer is prepared according to the method described in the above-mentioned Preparation Example 1, the first mixture is coated on the blue glass to form a sublayer including a near-infrared absorption dye, and then the second mixture is coated thereon to form a sublayer including an ultraviolet absorption dye, thereby obtaining a double-layer structure of blue glass + second absorption layer (including two sublayers). In addition, a three-layer structure of blue glass + first absorption layer + second absorption layer is prepared according to the method for preparing a double-layer structure, but the difference is that the coating liquid is first coated on the blue glass to form the first absorption layer and then the second absorption layer is prepared. The transmittance curves of the blue glass, double-layer structure, and three-layer structure are shown in FIG. Figure 4 It can be seen that the incorporation of the first absorption layer can greatly improve the cutoff effect of near-infrared rays and maintain high transmittance in the visible light range.

[0116] Example 1

[0117] The lens module configuration is as follows Figure 1 As shown, it is provided with a first lens 21; a second lens 22; a first substrate 11 (blue glass) and a second substrate 12 (blue glass); an optical bonding layer 31 (optical tape); a first absorption layer 13 (prepared according to the method described in Preparation Example 1, with a thickness of 145.44 μm); and a second absorption layer 14 (prepared according to the method described in Preparation Example 1, with a thickness of 5 μm).

[0118] Examples 2 to 4 and Comparative Example 1

[0119] The lens module was prepared according to the method of Example 1, but the thickness of the first absorption layer was changed to 146.22 μm, 147.44 μm and 146.63 μm, as Examples 2 to 4. In addition, the lens module was prepared according to the method of Example 1, but the thickness of the first absorption layer was changed to 165.11 μm, as Comparative Example 1. The transmittance curves of Examples 1 to 4 and Comparative Example 1 are shown in FIG. Figures 5 to 8 shown.

[0120] According to these results, the lens module of the present invention has a very high cutoff for incident light wavelengths of 930nm to 950nm, and even reaches an OD value of more than 4.5. To further show the OD value of the lens module of the present invention for incident light wavelengths of 930nm to 950nm, a transmittance curve and data were made. Fig. 9 , which is a graph of OD values ​​of the lens modules of Examples 1 to 4 for wavelengths of 930nm to 950nm. On the other hand, the lens module of the present invention has excellent transmittance to visible light, and has a passband that overlaps with the wavelength range of 350nm to 850nm, and the center wavelength of the passband is within the wavelength range of 350nm to 850nm.

[0121] according to Fig.10 The transmittance curve of the lens module of Example 1 is shown when incident light is irradiated at different angles of 0, 30, and 35 degrees, and the offset can be observed through this. Similarly, Fig.11 The transmittance curve of the lens module of Example 3 is irradiated with light at different angles of 0, 30 and 35 degrees. The results show that the transmittance curves obtained by irradiating the lens module at different incident angles are highly similar. For example, when the lens modules of Example 1 and Example 3 are incident at 0 and 30 degrees, respectively, the shift amplitudes of the center wavelength of the passband are 1.1nm and 1.4nm respectively; when the lens modules of Example 1 and Example 3 are incident at 0 and 35 degrees, respectively, the shift amplitudes of the center wavelength of the passband are 1.7nm and 1.9nm respectively. In contrast, the lens module of Comparative Example 2, which is prepared according to the method described in Example 1 but does not provide a first absorption layer, has a shift amplitude of up to 9.6nm in the center wavelength of the passband when incident at 0 and 30 degrees, respectively; and a shift amplitude of 10.1nm in the center wavelength of the passband when incident at 0 and 35 degrees, respectively, showing a large shift amplitude. It is known that such a large offset will cause glare and ghosting, but the lens module of the present invention exhibits a low offset amplitude, thereby significantly reducing glare and ghosting and improving image quality.

[0122] 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.

[0123] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims of the present invention.

Claims

1. A lens module with an integrated structure, characterized in that: include: A first lens and a second lens, which are respectively located at the outermost sides of the lens module; A first substrate and a second substrate, which are respectively disposed on the first lens and the second lens; An optical bonding layer, disposed on the first substrate or the second substrate and located between the first substrate and the second substrate; as well as A first absorption layer and a second absorption layer are located between the optical bonding layer and the first substrate or the second substrate, Wherein, the first absorption layer comprises: A copper complex formed by a copper compound for providing copper ions, a phosphonic acid as shown in Formula 1 and at least one phosphorus-containing compound as shown in Formulas 2 to 4, wherein R, R1, R2, and R3 are each independently substituted or unsubstituted C1 to C 12 Alkyl or substituted or unsubstituted C6 to C 12 Aryl, Wherein, the OD value of the first absorption layer for incident light wavelengths of 930nm to 950nm is greater than 4, Wherein, the second absorption layer includes infrared absorption dye and ultraviolet absorption dye.

2. The lens module 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 lens module according to claim 1, characterized in that: The first absorbing layer has a haze of 0.4% or less.

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

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

6. The lens module according to claim 1, characterized in that: The first absorption layer has a thickness of 25 μm to 150 μm.

7. The lens module according to claim 1, characterized in that: The minimum transmittance of the first absorption layer to incident light in the wavelength range of 460nm to 560nm is greater than 80%.

8. The lens module according to claim 1, characterized in that: The minimum transmittance of the first absorption layer to incident light in the wavelength range of 460nm to 560nm is greater than 85%.

9. The lens module according to claim 1, characterized in that: The optical bonding layer is an optical tape or an optical glue.

10. The lens module according to claim 1, characterized in that: The first substrate and the second substrate are made of glass.

11. The lens module according to claim 1, characterized in that: The materials of the first lens and the second lens are selected from glass, polycarbonate and polyacrylate.

12. The lens module according to claim 1, characterized in that: The second absorption layer includes at least one sublayer including an infrared absorption dye and at least one sublayer including an ultraviolet absorption dye.

13. The lens module according to claim 12, characterized in that: The near infrared absorbing dye is at least one selected from the group consisting of azo compounds, diimmonium compounds, dithiol metal complexes, squarylium compounds, cyanine compounds, and phthalocyanine compounds.

14. The lens module according to claim 12, characterized in that: The ultraviolet absorbing dye is at least one selected from the group consisting of azomethine compounds, indole compounds, ketone compounds, benzimidazole compounds and triazine compounds.

15. The lens module according to claim 1, characterized in that: The optical bonding layer further comprises a spacer material, which is disposed on the first substrate or the second substrate and surrounds the optical bonding layer.

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