JP5637675B2 - Hybrid lens - Google Patents

Description

  The present invention is a large-diameter lens to be mounted on a large-sized light such as a vehicle headlight, a searchlight, a projector light, or a spotlight, or a hybrid combining a lens made of different materials and used as a large-scale condenser lens for photovoltaic power generation. It relates to lenses.

  The lens is used in various optical devices such as a camera and a vehicle headlight, a condensing lens for solar power generation, and the like, and requires excellent optical characteristics peculiar to the purpose of the device. In addition, according to the use mode of the equipment, durability characteristics such as excellent heat resistance and weather resistance, and manufacturing characteristics that can be uniformly and uniformly formed in a large amount with a specific shape reduced in weight, size, or size However, there is a demand. In order to meet these needs, transparent raw materials such as inorganic glass, acrylic resin, polycarbonate resin, COP (cycloolefin polymer) resin, PET (polyethylene terephthalate) resin, silicone-modified epoxy resin, and silicone resin are used as lens raw materials. Such transparent polymer materials are widely used.

  Transparent inorganic materials, especially lenses made of inorganic glass, are excellent in optical properties, heat resistance, and weather resistance, but have large specific gravity of about 2.5 or more and contain harmful lead to improve workability. In addition, it is weak against impact and easily cracked, and is difficult to rework by cutting or the like. Therefore, recently, a lens formed of a transparent polymer material such as an acrylic resin, a polycarbonate resin, or a COP resin has been used.

  In particular, lenses molded with acrylic resin, polycarbonate resin, and COP resin are light, strong against impact, and have a low coefficient of linear expansion, so that the lens curvature is difficult to change due to temperature changes. Due to its low nature, it has the property of being yellowed, deformed and melted over time by heat from a high-intensity light source. Furthermore, when an acrylic resin, polycarbonate resin, or COP resin is injection-molded with a large diameter and thick lens in the mold, when the molten material is cooled and cured, the outside of the lens is first cooled and cured. Since it is still melted, curing proceeds with a temperature difference between the outside and the inside, so that a slight difference in shrinkage occurs. As the resulting lens has a large diameter, the entire lens is distorted, and so-called sink marks are formed. As a result, the optical properties are impaired, and in practice, only lenses having a diameter of about 40 mm and a thickness of about 30 mm can be obtained. There's a problem.

  On the other hand, when a lens molded with a silicone resin is molded with a two-component addition-curing type silicone, it has a deep curability in which the surface and the interior are uniformly cured. Therefore, even if such a lens is molded into a large-diameter and thick lens, it does not easily cause sink marks, is excellent in processability, particularly releasability from a mold and transferability, is colorless and transparent, and has a specific gravity of 1. It is as small as 1 and does not contain lead, is resistant to impact, has high heat resistance, does not yellow, deform, melt or deteriorate even when exposed to high-intensity light or heat for a long period of time, and has excellent weather resistance. Therefore, it is suitable for a lens using a solar cell which is an optical semiconductor or a light emitting diode (LED) which allows lead-free reflow.

  As such a silicone resin lens, Patent Document 1 discloses a silicone lens molded with a composition containing an organopolysiloxane.

  Silicone resins generally have a larger linear expansion coefficient than acrylic resins, polycarbonate resins, and COP resins. Therefore, when a lens made of silicone resin is exposed to high-intensity light, the lens curvature changes due to the heat generated by the light or the heat of the light source, causing the optical axis to shift or become out of focus. There is.

  On the other hand, as a compound lens coated on a glass lens, Patent Document 2 discloses a glass lens and an outer periphery of a glass lens in which an organic polymer resin such as a thermosetting resin such as an epoxy resin is laminated on one lens surface. There is disclosed a hybrid lens in which a supporting lens extending in the form of a single piece is joined. Such a thermosetting resin also has the property of causing yellowing or deformation over time due to heat from a high-intensity light source. Or as a large condenser lens. Further, in order to make the yellowing of the thermosetting resin inconspicuous, if the area of the glass is increased, it becomes heavier, or if the area of the thermosetting resin is increased in order to reduce the weight, the light transmittance due to the yellowing is lowered. .

JP 2006-328103 A JP 2006-171164 A

  The present invention has been made to solve the above-mentioned problems. It is easy to process and mold, and even when exposed to high-intensity light or heat from a light source for a long time, it is not deformed by the heat and does not cause defocusing. An object of the present invention is to provide a hybrid lens that can maintain a constant focal point and does not yellow, deform, melt, or deteriorate even when used for a long period of time, and is lightweight and excellent in weather resistance and heat resistance.

The hybrid lens according to claim 1, which has been made to achieve the above object, is a large-diameter lens that is mounted on a large-sized light selected from a vehicle headlight, a searchlight, a projector light, and a spotlight. And a large-diameter hybrid lens used in any of large-scale condensing lenses for photovoltaic power generation, a first lens molded with silicone resin, inorganic glass, acrylic resin, polycarbonate resin, cycloolefin polymer resin Or a second lens molded with a silicone-modified epoxy resin, having a common optical axis from the light source to the irradiated object, and overlapping, and the silicone resin removes the siloxane compound as a raw material thereof in a solvent-free manner The reaction is carried out in the presence of a platinum catalyst. Any one of the above-mentioned vinyl silyl groups selected from the group R and divinyl silyl group, and any one of the hydro silyl groups selected from the hydro silyl group and the dihydro silyl group are added and three-dimensionally cross-linked. The two lenses overlap each other by being bonded by chemical bonding through at least the silicone resin .

A hybrid lens according to a second aspect is the hybrid lens according to the first aspect, wherein the first lens and the second lens are directly passed through the silicone resin or the silicone resin and further a transparent adhesive. through the door, by adhering, characterized in that it said overlap.

The hybrid lens according to a third aspect is the hybrid lens according to the second aspect, wherein the transparent adhesive causes the bonding surfaces of the first lens and the second lens to adhere and / or closely adhere to each other. silicone gel or silicone elastomers to, or being a siloxane polymer to be bonded by an active group together of Gakuyui case of the bonding surface between the first lens and the second lens.

A hybrid lens according to a fourth aspect is the hybrid lens according to the third aspect, wherein the silicone resin has the dimethylsiloxy group or the diphenylsiloxy group as a repeating unit and is bonded with the silicone gel or the silicone elastomer. Or a vinyl alkoxy bonded to an active group on the surface of the second lens while having an active silyl group of a hydrosilyl group-containing silyl group having the hydrosilyl and a vinyl-containing silyl group having the vinylsilyl. A siloxane homopolymer is bonded by the chemical bond.

  The hybrid lens according to claim 5 is the hybrid lens according to claim 3, wherein the silicone gel or the silicone elastomer has a maximum penetration of 150, or a maximum Shore A hardness (Shore A hardness). 60.

  A hybrid lens according to a sixth aspect is the hybrid lens according to the first aspect, wherein the first lens is a convex lens on the light source side, and the second lens is on the irradiated body side. It is a convex meniscus lens.

A hybrid lens according to a seventh aspect is the hybrid lens according to the first aspect, wherein one of the first lens and the second lens is a Fresnel lens on the irradiated body side. Features.
The hybrid lens according to claim 8 is the hybrid lens according to any one of claims 1 to 7, wherein a corona discharge treatment, atmospheric pressure plasma is applied to a surface to be joined of the first lens and / or the second lens. It is characterized by being subjected to surface treatment such as treatment or ultraviolet treatment.
A hybrid lens according to a ninth aspect is the hybrid lens according to any one of the first to eighth aspects, wherein the first lens is on the light source side and the second lens is on the irradiated body side. inorganic glass Te, acrylic resin, polycarbonate resin, is molded in a cycloolefin polymer resin, or a silicone-modified epoxy resin, or the first lens is located on a side of the irradiated body, the side of the second lens is a light source And is formed of inorganic glass.
A hybrid lens according to a tenth aspect is the hybrid lens according to any one of the first to ninth aspects, wherein at least the diameter is 40 mm.
A hybrid lens according to an eleventh aspect is the hybrid lens according to any one of the first to tenth aspects, wherein the thickness is 20 to 1000 mm.
A hybrid lens according to a twelfth aspect is the hybrid lens according to the first aspect, wherein the first lens and the second lens are bonded via a chemical bond.
A hybrid lens according to a thirteenth aspect is the hybrid lens according to any one of the first to twelfth aspects, wherein the first lens has a linear expansion coefficient of 300 to 170 ppm, and the second lens has a linear expansion coefficient of 200 to It is characterized by 0.3 ppm.
A hybrid lens according to a fourteenth aspect is the hybrid lens according to any one of the first to thirteenth aspects, wherein the first lens and / or the second lens is subjected to an infrared cut surface treatment. And
A hybrid lens according to a fifteenth aspect is the hybrid lens according to any one of the first to fourteenth aspects, wherein a third lens is combined with the first lens and the second lens. .

  The hybrid lens of the present invention is processed and molded with a first lens processed and molded with a silicone resin having a relatively large linear expansion coefficient and a lens raw material such as inorganic glass, acrylic resin or polycarbonate resin with a relatively small linear expansion coefficient. The second lens overlaps. Therefore, the first lens having a large linear expansion coefficient is compensated by the second lens having a small linear expansion coefficient. As a result, even if it is exposed to high-intensity light from a high-intensity LED for a long time, it is not deformed by the heat. It is possible to maintain a constant focus without causing an optical axis shift.

  Moreover, since this hybrid lens is molded using a silicone resin raw material excellent in process moldability, it can have a large diameter exceeding a uniform and uniform diameter of 40 mm without causing sink marks. It can be reduced in weight and can be manufactured in large quantities with good yield.

  This hybrid lens eliminates various problems of conventional lenses by combining the excellent characteristics of the materials of the first lens and the second lens. In other words, this hybrid lens does not cause sink marks even when it has a large diameter and a considerable thickness due to the thick molding of a transparent thermoplastic resin and low heat resistance. In addition, this hybrid lens does not deform or melt in a high temperature environment, and does not change the lens curvature due to the heat of the light source due to the size of the linear expansion coefficient of the silicone resin. .

  Furthermore, this hybrid lens includes a resin lens that is excellent in mass productivity and can be adjusted to a desired size and thickness at a low cost when molding a thermoplastic resin, and a silicone resin lens that is excellent in heat resistance and thickness moldability. By combining them, it is possible to obtain an inexpensive large-diameter lens in which the heat resistance, which has been insufficient by itself, is significantly improved. Therefore, the focus shift due to linear expansion can be suppressed. Furthermore, by combining materials having different Abbe numbers and refractive indexes, the degree of freedom in optical design is increased, and an optical design that improves chromatic aberration over a single material lens can be achieved.

It is a figure which shows the outline | summary of the hybrid lens to which this invention is applied. It is a figure which shows the outline | summary of another hybrid lens to which this invention is applied.

  Hereinafter, although the form for implementing this invention is demonstrated in detail, the scope of the present invention is not limited to these forms.

  A preferred embodiment of the hybrid lens of the present invention will be described in detail with reference to FIG.

  As shown in FIG. 1, the hybrid lens 1 includes a first lens 2 that is a plano-convex lens made of a silicone resin and a second lens 3 that is a convex meniscus lens made of an acrylic resin, which are overlapped and adhered. . The hybrid lens 1 is disposed between the light source 5 and an irradiated object (not shown). The first and second lenses 2 and 3 are molded from raw materials having different properties.

  The first lens 2 disposed on the light source 5 side is molded by curing a silicone resin raw material, and the incident side of the light 6 emitted from the light source 5 has a planar shape, and the emission side of the light 6 has a convex shape. It is a convex lens. The silicone resin that is the material of the first lens 2 is excellent in precision transfer by mold molding, is excellent in scratch resistance, has a relatively high transmittance for light of various wavelengths, and has a loss of incident light. Even when irradiated with high-intensity light, it does not cause deterioration such as yellowing or alteration over time, and is stable against light such as infrared rays and ultraviolet rays, water, heat, and vibration. Thereby, the 1st lens 2 is a highly reliable thing excellent in moldability, heat resistance, weather resistance, and translucency.

Polysiloxane exemplified by poly (dialkylsiloxane) such as poly (dimethylsiloxane) and poly (diarylsiloxane) such as poly (diphenylsiloxane) as a raw material of the silicone resin used to mold the first lens 2 Compounds. Further, such a silicone raw material may be a three-dimensionally crosslinked silicone. In this three-dimensionally crosslinked polysiloxane compound, the Si group in the middle is an alkyloxysilyl group, a dialkyloxysilyl group, a vinylsilyl group, a divinylsilyl group, a hydrosilyl group, a dihydrosilyl group, or a plurality of these groups. By doing so, it is crosslinked three-dimensionally in a network. Siloxane compounds, and siloxane compounds and silane coupling agents used as needed are crosslinked by condensation of each alkyloxysilyl group or dialkyloxysilyl group by a dealcoholization reaction, vinylsilyl group or divinyl A silyl group and a hydrosilyl group or a dihydrosilyl group are added and crosslinked by heating or light irradiation in the presence of a platinum catalyst such as a platinum complex in the absence of a solvent. Among these, a polysiloxane compound that is added and crosslinked is preferable. A siloxane compound having a repeating unit such as a diphenylsiloxy group (—Si (C ₆ H ₅ ) ₂ —O—) or a dimethylsiloxy group (—Si (CH ₃ ) ₂ —O—) may be used. The siloxane compound is a polysiloxane compound having a repeating unit of a dimethylsiloxy group and having an alkyloxysilyl group, a dialkyloxysilyl group, a vinylsilyl group, a divinylsilyl group, a hydrosilyl group, and a dihydrosilyl group. preferable.

  The silicone resin that molds the first lens 2 is preferably polydimethylsilicone that can mold a lens that has a high Abbe number and does not separate colors. Polydiphenyl silicone causes yellowing of the phenyl group over time after long-term irradiation, but the refractive index of polydiphenyl silicone is 1.5 or more and is higher than the refractive index of polydimethylsilicone 1.41. Therefore, it is suitable as a material for a hybrid lens because it is suitable for thinning the lens and has excellent physical characteristics.

  Also, optical design that reduces chromatic aberration by combining materials with different Abbe numbers, such as inorganic glass, acrylic resin, polycarbonate resin, COP resin, or silicone-modified epoxy resin, and polydiphenyl silicone or polydimethyl silicone. It is also possible to do this. For example, in the case of a combination of silicone resins, a double-sided convex lens is molded using polydimethyl silicone (transmittance 94%, refractive index 1.41, Abbe number 53, linear expansion coefficient 250 ppm, hardness Shore A75), and polydiphenyl silicone. (Transmittance 92%, Refractive index 1.52, Abbe number 35, Linear expansion coefficient 190ppm, Hardness Shore D70) are combined with a single-sided plano-concave lens to overlap the complementary red light and blue light. It can be corrected by achromatic color. In this way, by combining materials having different linear expansion coefficients and optical characteristics, it is possible to prevent a focus shift due to a change in linear expansion or to make a lens with reduced chromatic aberration.

  The linear expansion coefficient of the first lens 2 is preferably 300 to 170 ppm. In particular, in the case of polydimethylsilicone resin, the hardness is preferably shore A70 to Shore D50 and the transmittance is preferably 92% or more. In the case of polydiphenyl silicone resin, the hardness is Shore D20 to D70 and the transmittance is If it is 90% or more, the lens is excellent in transparency, and because of its high hardness, the linear expansion coefficient can also be kept small, dust adhesion to the lens can be reduced, and deformation can be prevented when fixed to a lighting fixture. Is also preferable because it becomes easy.

  The second lens 3 disposed on the irradiated body side is formed by curing the acrylic resin raw material, and the incident side of the light 6 from the light source 5 has a concave shape that matches the convex shape of the first lens 2. The light 6 is a convex meniscus lens having a convex shape with a larger curvature than that of the concave surface on the incident side. The second lens 3 is adhered and adhered to the first lens 2 via the transparent adhesive layer 4 while covering the convex shape of the first lens 2. The acrylic resin that is the material of the second lens 3 has a smaller linear expansion coefficient than that of the silicone resin.

  The second lens 3 has been shown to be molded with an acrylic resin, but instead, it is molded with a polycarbonate resin, a COP resin, or a silicone-modified epoxy resin having a linear expansion coefficient smaller than that of a silicone resin, similar to the acrylic resin. It may be formed of inorganic glass.

  The acrylic resin, polycarbonate resin, COP resin, silicone-modified epoxy resin, and inorganic glass, which are the materials of the second lens 3, have relatively high transmittance with respect to light of various wavelengths, and have little loss of incident light.

  The linear expansion coefficient of the second lens 3 is preferably 200 to 0.3 ppm.

  The first and second lenses 2 and 3 may be dispersed with a diffusing agent, glass beads, a pigment, a phosphor, and an ultraviolet absorber according to the application, if necessary. Surface treatment may be performed by vapor deposition, CVD (Chemical Vapor Deposition) treatment, coating, cutting, anti-reflection coating, anti-glare coating, band pass filter, etc. Also good.

  The transparent adhesive layer 4 bonding the first and second lenses 2 and 3 is a silicone gel layer, for example, having a hardness of 90 to 37 as measured by a penetration meter according to JIS K2220. Examples thereof include a polydimethylsiloxane gel film, a silicone elastomer layer, and a polydimethylsiloxane elastomer layer having a Shore hardness of 5 to 60 as measured with a Shore A hardness meter in accordance with JIS Z2246. The transparent adhesive 4 is a low-molecular siloxane cut product, for example, LPS-1400, LPS-2400 (both manufactured by Shin-Etsu Chemical Co., Ltd .; trade name), OE-6250, Sotefa, SE1740 (both Toray Dow Corning Silicone) It may be a commercially available product such as a product name manufactured by Co., Ltd. The two lenses 2 and 3 are in close contact with each other due to the physical adhesiveness of the gel-like substance such as the silicone gel layer and the physical elasticity of the silicone elastomer layer.

  When the transparent adhesive layer 4 is a silicone gel layer or a silicone elastomer layer, it helps to relieve stress based on the difference in linear expansion coefficient between the first and second lenses 2 and 3.

  Although the example which adhere | attached the 1st and 2nd lens 2 * 3 with the transparent adhesive layer 4 was shown, you may join through the chemical bond. The refractive index of the adhesive of the transparent adhesive layer 4 is equal to the refractive index of the material forming the first or second lens 2 or 3, for example, polydimethyl silicone or polydiphenyl silicone, and the difference in the degree of refraction is visually recognized. However, it is preferable that the ratios are substantially the same so that the number of surface reflections can be reduced. Further, the refractive index of the adhesive is more preferably an intermediate refractive index of the material forming the first or second lens 2 or 3, since the interface reflection can be reduced.

  The hybrid lens 1 that is firmly adhered by the first lens 2 and the second lens 3 being bonded via a transparent adhesive or bonded via a chemical bond is exposed to a high temperature and has a linear expansion coefficient. Even if the large first lens 2 is somewhat linearly expanded, the second lens 3 having a small linear expansion coefficient compensates by suppressing the linear expansion of the first lens 2, so that the optical axis and the focus are not shifted. ing.

  In this hybrid lens 1, an example in which the first lens 2 and the second lens 3 are overlapped and bonded is shown. However, the first lens 2 and the second lens 3 may be stacked in close contact with each other. May be good.

  The hybrid lens 1 has a second lens 3 molded with inorganic glass, acrylic resin, polycarbonate, COP resin, or silicone-modified epoxy resin on the light source 5 side, and a second lens 3 molded with silicone resin on the irradiated object side. May be arranged. The materials of the first lens 2 and the second lens 3 may be reversed.

  The hybrid lens 1 is not particularly limited in shape and size, but is a large-diameter lens having a maximum lens diameter of 1000 mm, preferably 40 to 150 mm. Alternatively, the transmittance of the hybrid lens 1 is preferably 90% or more.

  The hybrid lens 1 is excellent in moldability and can give the lens a thickness, and the thickness is 1000 mm at maximum, preferably 20 to 100 mm. The thickness of the 1st lens 2 and the 2nd lens 3 is not specifically limited, One side may be thin and the other may be thick.

  As shown in FIG. 2, another hybrid lens 1a includes a first lens 2 that is plate-shaped and molded from a silicone resin, a Fresnel lens that is made of inorganic glass, acrylic resin or polycarbonate resin, COP resin, The second lens 3 molded from a silicone-modified epoxy resin is molded in a superimposed manner.

  The shapes of the first lens 2 and the second lens 3 are not limited and may be any lens that changes light in the process of transmitting and emitting incident light, such as light collection, diffusion, refraction, reflection, etc. It may be a convex lens, plano-convex lens, convex meniscus lens, biconcave lens, plano-concave lens, concave meniscus lens, or prism. Moreover, it is possible to superimpose them in each combination.

  Further, the first lens 2 or the second lens 3 may be a simple dome shape or flat plate having a constant thickness in order to minimize sink marks during molding. There is no effect of changing light in the process of transmitting and emitting incident light, such as reflection, but any lens effect can be used as long as it is used in combination.

  Although the example of the single hybrid lens which consists of the 1st lens 2 and the 2nd lens 3 was shown, a plurality of the hybrid lenses arranged, made a row in length and breadth, or made a row in concentric form, It may be an assembly of hybrid lenses.

  Although the example in which the first lens 2 is disposed on the light source 5 side has been shown, the portion where the light is collected also becomes high heat, so the second lens 3 is adapted to the structure, application, and use environment of the light source and the lighting fixture. May be arranged on the light source 5 side. Moreover, although the example which combined the 1st lens 2 and the 2nd lens 3 was shown as a hybrid lens, the 3rd lens may be combined and it may become a hybrid lens by the combination of three lenses according to a use.

  The hybrid lens 1 shown in FIG. 1 is manufactured by the following manufacturing method.

  The first production method is as follows. First, the silicone resin raw material composition is poured into a female mold, the male mold is fitted together, and the first lens 2 is molded by curing while molding in the gap. Moreover, the acrylic resin raw material composition is poured into a metal mold, a male metal mold is fitted together, and the second lens 3 is molded by being cured while being molded in the gap. A dimethyl silicone gel, which is a transparent adhesive, hangs down on the concave surface of the second lens 3, the convex surface of the first lens 2 is fitted and brought into close contact therewith, and is bonded via the gel layer 4. Is molded.

You may produce by another 2nd manufacturing methods as follows. First, a silicone raw material composition containing a silicone resin component having a hydrosilyl group-containing silyl group is poured into a female mold, the male mold is fitted together, and the first lens is cured while being molded in the gap. 2 is molded. Moreover, the acrylic resin raw material composition is poured into a metal mold, a male metal mold is fitted together, and the second lens 3 is molded by being cured while being molded in the gap. The surface to be joined of the second lens 3 is degreased and then subjected to a corona discharge treatment, atmospheric pressure plasma treatment or ultraviolet treatment surface treatment to expose or newly generate hydroxyl groups from the joined surface. The bonding surface is represented by CH ₂ = CH-Si (OCH ₃ ) ₂ -O-[(CH ₂ = CH-) Si (-OCH ₃ ) -O-] _j -Si (OCH ₃ ) ₂ -CH = CH ₂ (J is 3 to 4) soaked in a solution of a vinyl alkoxysiloxane homopolymer such as the vinyl methoxysiloxane homopolymer illustrated in FIG. The hydroxyl group and the vinyl methoxysiloxane homopolymer are reacted to form a silyl ether to produce an active silyl group that is a vinylsilyl group-containing silyl group. In order to improve the reactivity, it is immersed in a platinum catalyst suspension to hold the platinum catalyst on the vinyl group in the active silyl group. If the bonding surface of the first lens 2 subjected to degreasing treatment or surface treatment is brought into contact therewith and heated and vulcanized as necessary, vinyl of a vinylsilyl group-containing silyl group and hydrosilyl group-containing silyl group of hydrosilyl are obtained. As a result of the addition-type reaction, the first lens 2 and the second lens 3 are attached through a firm chemical bond and are firmly bonded.

  A silicone composition containing a hydrosilyl group-containing silyl group-containing silicone resin component in which a reactive group is a hydrosilyl group is bonded to the second lens surface using a vinyl methoxysiloxane homopolymer whose active group is a vinyl group. As an example, the active group is any active silyl group of hydrosilyl-containing silyl group, vinyl-containing silyl group, alkoxysilyl-containing silyl group, hydrolyzable group-containing silyl group, and the reactive group is the silicone. The reactive silyl group may be any of hydrosilyl group-containing silyl group, vinylsilyl group-containing silyl group, alkoxysilyl-containing silyl group, and hydrolyzable group-containing silyl group in the resin component. The combination of the active group and the reactive group, when either is a hydrosilyl group-containing silyl group, the other is a vinylsilyl group-containing silyl group, and when either is an alkoxysilyl-containing silyl group, the other is alkoxysilyl-containing Examples include silyl groups or hydrolyzable group-containing silyl groups, all of which are hydrolyzable group-containing silyl groups.

  Any of these active silyl groups is formed by the reaction of the alkoxysilyl group of the functional alkoxysilyl compound with the hydroxyl group on the surface of the lens.

  Due to the characteristics of the silicone resin, the molding method using a mold can be easily molded even if the lens has a complicated and fine shape by processing the mold.

  The molding of the first lens 2 and the second lens 3 may be a polishing process.

  Moreover, although the example which shape | molds the 1st lens 2 and the 2nd lens 3 separately and shape | molds the hybrid lens 1 was shown, you may shape | mold the 1st lens 2 and the 2nd lens 3 integrally. The first lens 2 and the second lens 3 may be insert-molded.

  The hybrid lens 1 is used as follows.

  As shown in FIG. 1, a first lens 2 that is a plano-convex lens made of a silicone resin and a second lens 3 that is a convex meniscus lens made of an acrylic resin are interposed through a silicone gel layer 4 that is a transparent adhesive. The hybrid lens 1 that is overlapped and in close contact will be described as an example.

  High-intensity light 6 from a light source 5, for example, a high-intensity LED, enters the first lens 2, and further exits from the second lens 3 through the silicone gel layer 4 to illuminate the irradiated object. The first lens 2 is linearly expanded by being heated by the light 6, but the first lens 2 having a large linear expansion coefficient due to being closely adhered and fixed via the second lens 3 and the silicone gel layer 4. Even if the linear expansion is somewhat, the second lens 3 having a small linear expansion coefficient suppresses the linear expansion of the first lens 2 to prevent deformation and compensate the linear expansion coefficient. As a result, only the first lens 2 made of silicone In other words, the optical axis and focus of the second lens 3 do not shift. Moreover, since the first lens 2 does not cause yellowing over time due to the high-intensity light 6 and the heat conduction to the second lens 3 is suppressed, the yellowing of the second lens 3 also occurs. Suppressed.

  Hereinafter, an example in which a prototype of a hybrid lens to which the present invention is applied will be described in detail.

Example 1
As a material for molding the second lens 3, Acrypet light guide plate grade VH5 (manufactured by Mitsubishi Rayon Co., Ltd .; trade name, Acripet is a registered trademark of the company) was used. This is injected with an injection molding machine into a lens mold that molds a convex meniscus lens, which is an inner dome-type aspherical lens with a diameter of 65 mm and a thickness of 2 mm, having a curved surface optically designed as shown in FIG. A molded product of the second lens 3 which is a meniscus lens was obtained.
Separately, silicone resin LPS-3400 (manufactured by Shin-Etsu Chemical Co., Ltd .; trade name, rubber hardness Shoer A is 75) was used as a molding material for the first lens 2. It is poured into a lens molding die for molding a hemispherical lens having a curved surface optically designed as shown in FIG. 1, which is slightly smaller than the inner dome shape of the previously molded second lens 3. After defoaming, it was cured by compression molding under conditions of 180 ° C. × 30 minutes, and a molded product that was a hemispherical first lens 2 slightly smaller than the inner dome shape of the second lens 3 was obtained.
Next, the corona treatment was performed on the adhesive surfaces of both the first lens 2 and the second lens 3. The silicone adhesive SE1740 (manufactured by Toray Dow Corning Co., Ltd .; trade name, Shore A hardness is 34) is applied so as to rise to the top of the inner surface dome shape which is the bonding surface of the second lens 3, and the inner surface dome shape is applied. The first lens 2 was inserted so as to be fitted to each other, and the adhesive was spread so as not to entrain air, and the lenses 2 and 3 were brought into close contact with the transparent adhesive layer 4. After that, both lenses 2 and 3 are held up and down with a holder (not shown) and fixed up and down, and the adhesive is cured using a heating oven under conditions of 70 ° C. × 1 hour, and then bonded to the headlight. A hybrid lens 1 was prepared.

(Example 2)
Silicone resin LPS-3400 (manufactured by Shin-Etsu Chemical Co., Ltd .; trade name, rubber hardness Shoer A is 75) was used as a molding material for the second lens 3. It is poured into a lens molding die for molding an optically designed Fresnel lens as shown in FIG. 2, vacuum degassed, and cured by compression molding at 180 ° C. for 30 minutes, with a 300 mm square Fresnel lens molded body. A molded product of a certain second lens 3 was obtained.
Separately, as a material for molding the first lens 2, a solar cell cover glass Solite (manufactured by Asahi Glass Co., Ltd .; trade name) was cut into a size of 300 mm square and prepared.
Next, CY52-276 (manufactured by Toray Dow Corning Co., Ltd .; trade name, penetration according to JIS K2220 is 75), which is a silicone adhesive manufactured by Toray Dow Corning, is used as the glass adhesive surface of the first lens 2. Applied to. With the condenser lens for solar cells, the Fresnel lens adhesion surface of the second lens 3 and the glass adhesion surface of the first lens 2 are adhered, and the adhesive is cured under the condition of 50 ° C. × 1 hour. A certain hybrid lens 1 was produced.

Example 3
As a material for molding the second lens 3, Acrypet light guide plate grade VH5 (manufactured by Mitsubishi Rayon Co., Ltd .; trade name, Acripet is a registered trademark of the company) was used. This is injected with an injection molding machine into a lens mold that molds a convex meniscus lens, which is an inner dome-type aspherical lens with a diameter of 65 mm and a thickness of 2 mm, having a curved surface optically designed as shown in FIG. A molded product of the second lens 3 which is a meniscus lens was obtained.
Separately, silicone resin LPS-5510 (manufactured by Shin-Etsu Chemical Co., Ltd .; trade name, resin hardness Shoer D hardness is 60) was used as a molding material for the first lens 2. It is poured into a lens molding die for molding a hemispherical lens having a curved surface optically designed as shown in FIG. 1, which is slightly smaller than the inner dome shape of the previously molded second lens 3. After defoaming, it was cured by compression molding under conditions of 180 ° C. × 30 minutes to obtain a lens molded product that was a hemispherical first lens 2 slightly smaller than the inner dome shape of the second lens 3.
Next, the corona treatment was performed on the adhesive surfaces of both the first lens 2 and the second lens 3. After immersing them in a solution of vinyl methoxysiloxane homopolymer and drying, silicone elastomer LPS-2400 (manufactured by Shin-Etsu Chemical Co., Ltd .; trade name, rubber hardness Shoer A is 24) is used as the silicone adhesive. It was applied to the top of the inner surface dome shape which is an adhesive surface, the first lens 2 was inserted, and the adhesive was spread so as not to entrain air. Was in close contact. After that, both lenses 2 and 3 are held up and down with a holder (not shown) and fixed up and down, and the adhesive is cured using a heating oven under conditions of 70 ° C. × 1 hour, and then bonded to the headlight. A hybrid lens 1 was prepared.

Example 4
As a material for molding the second lens 3, Acrypet light guide plate grade VH5 (manufactured by Mitsubishi Rayon Co., Ltd .; trade name, Acripet is a registered trademark of the company) was used. This is injected with an injection molding machine into a lens mold that molds a convex meniscus lens, which is an inner dome-type aspherical lens with a diameter of 65 mm and a thickness of 2 mm, having a curved surface optically designed as shown in FIG. A molded product of the second lens 3 which is a meniscus lens was obtained.
Separately, white glass having a diameter of 65 mm and a thickness of 2 mm was prepared as the first lens 2.
Next, the corona treatment was performed on the adhesive surfaces of both the first lens 2 and the second lens 3. After immersing them in a solution of vinyl methoxysiloxane homopolymer and drying, the silicone elastomer WACKER SiriGel 612 (Asahi Kasei Silicone Co., Ltd .; trade name) is used as a third lens in the inner dome of the second lens 3. Filled, sealed with a first lens 2 so as to be covered, and cured at room temperature to produce hybrid lens 1.

(Example 5)
As a molding material for the first lens 2, Acripet light guide plate grade VH5 (manufactured by Mitsubishi Rayon Co., Ltd .; trade name, Acripet is a registered trademark of the same company) was used. This was injected with an injection molding machine into a lens molding die for molding a biconvex lens having a double-sided convex shape with a diameter of 60 mm having an optically designed curved surface, to obtain a molded product of the first lens 2 which is a biconvex lens.
Separately, a silicone resin SR7010 (manufactured by Toray Dow Corning Silicone Co., Ltd .; trade name) was used as a molding material for the second lens 3. The second lens 3 that is a plano-concave lens is poured into a lens molding die for molding a plano-concave lens having a diameter of 65 mm and having one surface formed into a flat surface on the other side. Was molded.
Next, the corona treatment was performed on the adhesive surfaces of both the first lens 2 and the second lens 3. After immersing them in a solution of vinyl methoxysiloxane homopolymer and drying, both lenses 2 and 3 are joined using WACKER SiriGel 612 (trade name, manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), which is a silicone elastomer, as a buffer layer. Then, a hybrid lens 1 with reduced chromatic aberration was manufactured by combining materials having different Abbe numbers.

  These lenses are deformed by heat when they are exposed to high-intensity LEDs for a long time, as a result of compensating the lens made of silicone resin having a relatively large linear expansion coefficient with a lens having a relatively small linear expansion coefficient. Without keeping the focus constant.

  The hybrid lens of the present invention is useful as a large-sized lens, and is used for a vehicle headlight lens, a lens for a projector such as a searchlight or a projector, a lens for a lighthouse projector, and a lighting device equipped with a high-intensity light-emitting diode. It is used for the lens of this kind, the condensing lens of solar power generation, etc.

  1, 1a is a hybrid lens, 2 is a first lens, 3 is a second lens, 4 is a transparent adhesive layer, 5 is a light source, and 6 is light.

Claims (15)

A large-diameter hybrid lens used for either a large-diameter lens mounted on a large-sized light selected from vehicle headlights, searchlights, projector lights, and spotlights, and a large-scale condenser lens for photovoltaic power generation. ,
The first lens molded with silicone resin and the second lens molded with inorganic glass, acrylic resin, polycarbonate resin, cycloolefin polymer resin, or silicone-modified epoxy resin are common light from the light source to the irradiated object. Have axes, overlap,
The silicone resin is obtained by reacting a raw material siloxane compound in the absence of a solvent in the presence of a platinum catalyst, and any one of the above-described vinylsilyl groups and divinylsilyl groups of the siloxane compound and a hydrosilyl group. And any one of hydrosilyls selected from dihydrosilyl groups are added and three-dimensionally crosslinked,
The hybrid lens, wherein the first lens and the second lens overlap each other by being bonded by chemical bonding through at least the silicone resin.   The first lens and the second lens overlap each other by being bonded directly through the silicone resin or through the silicone resin and further through a transparent adhesive. The hybrid lens according to claim 1.   The transparent adhesive is a silicone gel or a silicone elastomer that adheres and / or adheres to each joint surface of the first lens and the second lens, or each of the first lens and the second lens. The hybrid lens according to claim 2, wherein the hybrid lens is a siloxane polymer that bonds the active groups on the bonding surface by chemical bonding.   The silicone resin has the dimethylsiloxy group or the diphenylsiloxy group as a repeating unit and is bonded with the silicone gel or the silicone elastomer, or the silicone resin has a hydrosilyl-containing hydrosilyl group-containing silyl group and the vinylsilyl. 4. A vinyl alkoxysiloxane homopolymer bonded to an active group on the surface of the second lens while having an active silyl group with a vinyl-containing silyl group having a bond with the chemical bond. The hybrid lens described in 1.   4. The hybrid lens according to claim 3, wherein the silicone gel or the silicone elastomer has a maximum penetration of 150 or a Shore A hardness of 60.   The hybrid lens according to claim 1, wherein the first lens is a convex lens on the light source side, and the second lens is a convex meniscus lens on the irradiated side.   2. The hybrid lens according to claim 1, wherein one of the first lens and the second lens is a Fresnel lens on the irradiated body side.   The surface to be bonded to the first lens and / or the second lens is subjected to a corona discharge treatment, an atmospheric pressure plasma treatment, or an ultraviolet treatment surface treatment. The hybrid lens described in 1. The first lens is on the light source side, and the second lens is on the irradiated object side, and is molded of inorganic glass, acrylic resin, polycarbonate resin, cycloolefin polymer resin, or silicone-modified epoxy resin or wherein the first lens is located on a side of the irradiation object, according to claim 1, wherein the second lens is characterized in that it has been formed with inorganic glass be in a side of the light source Hybrid lens.   The hybrid lens according to claim 1, wherein the diameter is at least 40 mm.   The hybrid lens according to claim 1, wherein the thickness is 20 to 1000 mm.   The hybrid lens according to claim 1, wherein the first lens and the second lens are bonded via a chemical bond.   The hybrid lens according to claim 1, wherein the first lens has a linear expansion coefficient of 300 to 170 ppm, and the second lens has a linear expansion coefficient of 200 to 0.3 ppm. The hybrid lens according to claim 1, wherein the first lens and / or the second lens is subjected to an infrared cut surface treatment. The hybrid lens according to claim 1, wherein a third lens is combined with the first lens and the second lens.

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