JP5840823B2 - Lens and lighting apparatus having the same - Google Patents

Description

  The present invention provides a resin that efficiently transmits flash light emitted from a camera flash lamp or the like to a dark subject, or high-intensity light that illuminates the dark with an illumination lamp such as a projector in a desired direction. The present invention relates to a made lens and a luminaire having the same.

  High-pixel digital cameras that can shoot subjects beautifully and cameras that can be easily taken with a built-in mobile phone are widely used. These cameras incorporate a flash lamp such as a xenon tube or a white light emitting diode that irradiates a subject with a sufficient amount of flash light so that it can be sufficiently photographed even in the dark.

  The flash light emitted from the flash lamp passes through a lens made of epoxy resin, fluorine-containing resin, silicone resin or the like, and converges or diverges in a desired direction, and reaches the subject.

  The flash light is a flash light with a short duration and a large amount of light. The surface of the resin lens is carbonized by the flash light accompanied by heat. Therefore, the surface of the lens is darkened, and the light transmittance of the lens is lowered. In addition, lenses made of resin, particularly epoxy resin, are yellowed and deteriorated by heat and oxygen. As a result, a sufficient amount of flash light including a desired wavelength does not reach the subject, and the subject cannot be photographed beautifully.

  In order to allow flash light to reach the subject efficiently, Patent Document 1 uses a reflector formed in the order of a polyparaxylylene resin layer, a silver thin film layer, a transparent polymer film, an adhesive layer, and a plate-shaped molded body. A strobe reflector is described. When the flash light is reflected by the reflector and efficiently led to the intended direction through the lens, the amount of light to the lens further increases, which promotes deterioration of the lens such as darkening and yellowing.

JP-A-10-206613

  The present invention has been made in order to solve the above-described problems. High-intensity flash light, illumination light, or the like is converged or diverged in a desired direction by a lens and efficiently transmitted. The lens surface of the resin is not blackened even when exposed to light, and the lens itself does not turn yellow and has excellent durability, and a luminaire having this lens and a lamp that emits such light. With the goal.

The lens manufacturing method according to claim 1, which has been made to achieve the above object, is selected from a silicone resin and a silicone rubber obtained by curing a liquid addition reaction curable silicone resin composition. molding a resin is silicone, to the light transmitting surface, a manufacturing method of the lens to attach any of the film of the polyparaxylylene acids and fluorine-containing resin, and an ultraviolet absorber is contained in the coating Orazu, in the molded the silicone rubber of the lens, wash the low-molecular-weight siloxane with an organic solvent, or under reduced pressure or heated to facilities pretreatment to volatilize the low molecular siloxane, the light transmission the surface, primer treatment, corona treatment, plasma treatment, flame treatment, and after the reforming processing of one of the ultraviolet irradiation treatment, characterized in that to attach the film

Method for producing a lens according to claim 2, which has been described in claim 1, characterized in that said molded you a convex lens or a Fresnel lens.

The method for producing a lens according to claim 3 is the method according to claim 1, wherein the polyparaxylylene is chlorine-containing polyparaxylylene.

The method for producing a lens according to claim 4 is the method according to claim 3, wherein the chlorine-containing polyparaxylylene replaces — (CH ₂ ) —C ₆ H ₃ Cl— (CH ₂ ) — with paraxylylene. It is a repeating unit.

The method for producing a lens according to claim 5 is the method according to claim 1, wherein the silicone is polydimethylsiloxane, polydiphenylsiloxane, or addition reaction curable type of organopolysiloxane and organohydrogenpolysiloxane. It is characterized by being silicone.
The method for manufacturing a lens according to claim 6 is the method according to claim 1, wherein the light transmission surface is modified by the treatment, and then vapor deposition, dipping, spray coating, spin coating, sputtering, Alternatively, the coating of the polyparaxylylene is applied by coating.
According to a seventh aspect of the present invention, there is provided a lens manufacturing method according to the first aspect, wherein the coating is applied to the light transmitting surfaces of the light incident surface side and the light emitting surface side.

The manufacturing method of the lighting fixture according to claim 8 is characterized in that the lens manufactured by the manufacturing method of the lens according to claim 1 is arranged in a light emitting direction of a flash lamp or an illumination lamp that emits the light. To do.

  Since the lens surface of the present invention has a lens surface coated with a polyparaxylylene film or a fluorine-containing resin film having a low friction coefficient and dielectric constant, the lens surface is exposed to strong flash light. Even if static electricity, heat, or plasma is generated, it is difficult to cause deterioration of the resin constituting the lens, deterioration of the lens surface, or the like. Therefore, even if it is frequently exposed to a high amount of flash light or the like, there is no risk of darkening and contamination, and light is transmitted efficiently. In addition, polyparaxylylene coatings are deposited uniformly and are excellent in thermal stability, light transmission, scratch resistance, cold resistance, chemical resistance, and UV resistance, making the lens durable. Excellent. In particular, when the lens is made of silicone, there is no deterioration such as yellowing of the lens itself.

  Even if this lens is a convex lens or a Fresnel lens, the film is uniformly applied.

  Further, this lens prevents surface reflection at a wavelength to be transmitted or blocks transmission at a specific wavelength according to the optical path distance of the polyparaxylylene coating.

  When a camera is photographed in the dark using a lighting fixture having this lens, a sufficient amount of flash light can be emitted to the subject, so that imaging is beautiful. In addition, since a sufficient amount of flash light can be irradiated stably for a long time without darkening, there is no need for troublesome parts replacement.

Preferred form for carrying out the invention

  Hereinafter, embodiments of the present invention will be described in detail, but the scope of the present invention is not limited to these embodiments.

  A description will be given with reference to FIG.

  The lens 1 of the present invention is a coating 3a and 3b of “Parylene C” (trade name, manufactured by Japan Parylene Co., Ltd .; Parylene is a registered trademark), which is a chlorine-containing polyparaxylylene. Is coated. The luminaire 2 is one in which the lens 1 is arranged, incorporated and fixed in the light emission direction of a flash lamp which is the lamp 4.

  This lens 1 is manufactured as follows.

The planoconvex lens 1 is obtained by molding with polydimethylsiloxane which is a silicone resin. On the surface of the lens 1, a coating 3a of “Parylene C” (trade name, manufactured by Parylene Japan; Parylene is a registered trademark; — [(CH ₂ ) —C ₆ H ₃ Cl— (CH ₂ )] _n −) 3b is formed. For example, a powdered monochloroparaxylylene dimer that is a raw material dimer of “Parylene C” is placed in a vaporization chamber and heated under reduced pressure, and the evaporated dimer is guided to a thermal decomposition chamber to produce highly reactive paraxylylene. After forming a radical of a lenmon monomer, it is vapor deposited on the lens and polymerized to form a polyparaxylylene film, thereby obtaining a lens.

  The lighting fixture 2 using this lens 1 is manufactured as follows. For example, when the lens 1 is fixedly assembled in accordance with the light emission direction from the flash lamp 4 which is a xenon tube built in the camera, a lighting apparatus 2 which is a flash mechanism of the camera is obtained.

In addition, although the example in which the lens was vapor-deposited with the polyparaxylylene coatings 3a and 3b having “Parylene C” was shown, “Parylene” obtained from paraxylylene dimer (DPX) instead of “Parylene C” was shown. N "(trade name, manufactured by Japan Parylene Co., Ltd.) or" Parylene D "(trade name, manufactured by Japan Parylene Co., Ltd.) obtained from tetrachloroparaxylylene dimer may be used. The dimer that is the raw material is heated to about 600 ° C. under low pressure to be sublimated to generate highly reactive paraxylylene radical gas, and deposited to form polyparaxylylene coatings 3a and 3b. Also good. Among these, it is more preferable that polyparxylylene coatings 3a and 3b are vapor-deposited with "Parylene C". The refractive index n _d ²³ of these polyparaxylylenes is, for example, “Parylene N” is 1.661 and “Parylene C” is 1.639. The refractive index of silicone resin is 1.43 and the refractive index of epoxy resin is 1. Higher than .55 to 1.61. Therefore, optical properties such as surface reflection prevention are adjusted by appropriately selecting the resin of the optical component material that transmits visible light, for example, light of wavelength λ, and the optical distance that is an integer multiple of these parylene and λ of the coating material. it can.

  The polyparaxylylene coatings 3a and 3b can be uniformly adjusted to a desired thickness by adjusting the amount of raw material dimer and the deposition time.

  According to the vapor deposition of such polyparaxylylenes, it is not necessary to heat the lens as the base material, so there is no fear that the lens is thermally deformed. Further, since the deposition and polymerization of diparaxylylene radicals on the lens proceed simultaneously, the manufacturing process is short and simple.

  The polyparaxylylene has been shown as an example applied to a lens by vapor deposition, but may be applied by dipping, spray coating, spin coating, sputtering, or application.

  Although the resin used for molding the lens 1 is an example of polydimethylsiloxane which is a silicone resin, another silicone resin such as polydiphenylsiloxane may be used.

  Such a silicone resin can be obtained, for example, by curing a silicone resin composition. As the silicone resin composition, a liquid addition reaction curable silicone resin composition is particularly preferable. The liquid addition reaction curable silicone resin composition is suitable because it is solvent-free and can be uniformly cured on the surface and inside without foaming.

  The addition reaction curable silicone resin composition is not particularly limited as long as it forms a transparent silicone resin by heat curing. The thing containing heavy metal type catalysts, such as a catalyst, is mentioned.

Examples of the organopolysiloxane include the following average unit formula R _a SiO _{(4-a) / 2}
Wherein R is an unsubstituted or substituted monovalent hydrocarbon group, preferably having 1 to 10 carbon atoms, particularly 1 to 8. a is a positive number of 0.8 to 2, particularly 1 to 1.8. Number.)
The thing shown by is mentioned. Here, R is an alkyl group such as a methyl group, an ethyl group, a propyl group or a butyl group, an alkenyl group such as a vinyl group, an allyl group or a butenyl group, an aryl group such as a phenyl group or a tolyl group, or an aralkyl such as a benzyl group. A halogen-substituted hydrocarbon group such as a chloromethyl group, a chloropropyl group, or a 3,3,3-trifluoropropyl group in which some or all of the hydrogen atoms bonded to these carbon atoms are substituted with a halogen atom, Or a cyano group-substituted hydrocarbon group such as a 2-cyanoethyl group substituted with a cyano group, and R may be the same or different, but those containing a phenyl group as R, particularly all R Among these, those having a phenyl group in 5 to 80 mol% are preferable from the viewpoint of heat resistance and transparency of the optical component for illumination.

  Further, those containing an alkenyl group such as a vinyl group as R, particularly those in which 1 to 20 mol% of all R are alkenyl groups are preferred, and those having two or more alkenyl groups in one molecule are preferably used. It is done. Examples of such organopolysiloxane include terminal alkenyl group-containing diorganopolysiloxanes such as dimethylpolysiloxane having a terminal alkenyl group such as vinyl group and dimethylsiloxane / methylphenylsiloxane copolymer, A liquid at room temperature is preferably used.

  On the other hand, the organohydrogenpolysiloxane is preferably trifunctional or higher (that is, one having three or more hydrogen atoms (Si-H groups) bonded to a silicon atom in one molecule), for example, methylhydrogenpolysiloxane. , Methylphenyl hydrogen polysiloxane, and the like, and liquids at room temperature are particularly preferable. Examples of the catalyst include platinum, platinum compounds, organometallic compounds such as dibutyltin diacetate and dibutyltin dilaurate, and metal fatty acid salts such as tin octenoate. The types and amounts of these organohydrogenpolysiloxanes and catalysts may be appropriately determined in consideration of the degree of crosslinking and the curing rate.

  The silicone resin may be those described in JP-A-2004-221308, JP-A-2006-328102, JP-A-2006-328103, and JP-A-2006-324596.

  In addition to the above components, fillers, heat-resistant materials, plasticizers and the like may be added to the extent that the strength and transparency of the resulting silicone resin are not impaired.

  As the silicone resin composition, commercially available products such as KJR632 manufactured by Shin-Etsu Chemical Co., Ltd. can be used.

  The lens can be obtained by a conventionally known method by molding the silicone resin composition into a silicone resin molded body, and can be molded by, for example, injection molding, extrusion molding, cast molding, or the like. The hardness of the lens is Shore D hardness measured by the method of JIS K 7215 (plastic durometer hardness test method), and is preferably 20 ° to 90 °, particularly 50 ° to 80 °.

  The transmittance of a lens molded with polydimethylsiloxane is about 94%, and the transmittance of a lens molded with polydiphenylsiloxane is about 92%, which is equivalent to the transmittance of 92% with a lens molded with an epoxy resin. It is more preferable that the lens 1 is molded with a hard silicone resin such as polydimethylsiloxane because it is difficult to expand and is not easily deteriorated on a low wavelength side such as ultraviolet rays, and is suitable for maintaining optical characteristics. . The lens 1 more preferably has a Shore D hardness of about 50 ° to 70 °.

  Further, this resin may be a silicone rubber which is the same kind as such a silicone resin and in which a relatively low molecular weight organopolysiloxane is crosslinked. The lens made of silicone rubber is washed with an organic solvent such as 1-bromopropane or trichlorethylene, and the pressure is reduced, or the temperature is reduced to 150 to 200 ° C., preferably 150 to 170 ° C. It is preferable that a pretreatment for volatilization is performed. Secondary vulcanization treatment or solvent extraction treatment may be performed.

  In particular, when the lens 1 is made of silicone rubber, volatile components such as moisture and low-molecular siloxane are likely to remain, and it is preferable to volatilize them.

  In addition, when the lens 1 is made of silicone, in order to improve the adhesion between the lens and the coating, the lens is subjected to primer treatment with a primer treatment agent, corona treatment under corona discharge under atmospheric pressure or reduced pressure, and under reduced pressure. The film may be modified by glow discharge plasma treatment, flame treatment burned by a flame of a burner, or ultraviolet irradiation treatment with an ultraviolet lamp, and then deposited with a polyparaxylylene coating.

  The primer treatment agent is not particularly limited as long as it can firmly provide a light reflecting portion on the surface of silicone, for example, as a material that does not optically deteriorate even when exposed to strong light or heat for a long time. Primer treatment agents such as methyldisilazane, hexamethyldisiloxane and / or tetraethylorthosilicate are preferred. These are preferably applied to a silicone lens and subjected to a primer treatment.

  The lens may be covered with a metal plating that reflects the inner surface (total reflection) or a transparent material with a low refractive index, other than the portion where light should enter or exit. Thereby, a part of the light incident on the lens can be reflected by the metal plating and refracted in a desired direction of the lens, and can be emitted efficiently.

  The luminaire 2 may be provided with a reflector (not shown) on the substantially opposite side of the light emission direction from the lamp 4 to the lens 1.

  The lighting fixture 2 is used as follows. The flash lamp of the xenon tube which is the lamp 4 is caused to emit light. Then, the light 5 emitted from the lamp 4 is incident on the lens 1 and becomes light diverged by the action of the lens 1 and reaches a desired direction of the subject to be irradiated.

  Although the example in which the lens 1 is a plano-convex lens is shown as an example of a convex lens, it may be a Fresnel lens as shown in FIG. Since the coating 3a on the light incident surface side of the Fresnel lens and the uneven surface of the coating 3b on the exit surface side are uniformly coated with a polyparaxylylene coating or fluorine-containing resin, The light 5 is diverged by the action of the lens 1 and efficiently reaches the subject to be irradiated.

  Examples 1 and 2 show examples of prototype lenses and lighting fixtures to which the present invention is applied.

(Example 1)
The method for preparing the lens is as follows. As the raw material of the lens, dimethyl silicone LPS-L400A / B (manufactured by Shin-Etsu Chemical Co., Ltd .: trade name) which is an addition curing type was used. 10 g of the A liquid and 10 g of the B liquid are mixed and vacuum degassed, then poured into a lens mold, cured by heating at 150 ° C. for 20 minutes, and heat-treated in an oven at 200 ° C. for 2 hours to form a silicone convex lens Got.

This was coated by vapor deposition of the following polyparaxylylenes. The vapor deposition of polyparaxylylene was performed by the following three steps. That is, first step of vaporizing diparaxylylene, which is a solid raw material dimer, at a vacuum degree of 10 ^{−3 to 1} Torr at 100 to 200 ° C .; diradical paraxylylene by thermal decomposition of the raw material dimer is 10 ⁻³ to Second step of generating at 450 to 700 ° C. at a vacuum of 1 Torr; forming a film of diradical paraxylylene on a silicone convex lens as a substrate at a vacuum of 10 ^{−3 to} 1 Torr at room temperature The third step was performed. As a result, a silicone convex lens for a flash camera in which polyparaxylylenes were deposited in a film thickness of 0.3 μm was obtained. A frame was fitted to this lens to obtain a luminaire having a flash light source holder.

(Example 2)
As a raw material for lenses, dimethyl silicone (LPS-L400A / B; manufactured by Shin-Etsu Chemical Co., Ltd.), which is an addition-curing type, is poured into a mold and cured by heating at 170 ° C. for 1 hour, using a Fresnel lens as a base material. ,Obtained. Prepare “CYTOP” (registered trademark of Asahi Glass Co., Ltd.), which is a fluorine-containing organic material target, and SiO ₂ as a material to be deposited by ion beam sputtering. Coated. A lighting fixture was obtained in the same manner as described above.

  The lens of the present invention is used by being incorporated in a camera as a member of a lighting device for flash light. Further, it is used by being incorporated in a lighting apparatus such as a high-intensity projector such as a strobe, a searchlight, or a projector.

A lighting fixture having this lens is useful for irradiating a subject with sufficient light during photographing or projection.

It is a schematic diagram which shows the implementation middle of the lens which applies this invention, and a lighting fixture which has it. It is a schematic diagram which shows the middle of implementation of another lens to which this invention is applied, and a lighting fixture having the same.

Explanation of symbols

  1 is a lens, 2 is a lighting fixture, 3a and 3b are polyparaxylylene coatings, 4 is a lamp, and 5 is light.

Claims (8)

The liquid addition reaction curable silicone resin composition is molded with a resin that is a silicone selected from a cured silicone resin and silicone rubber, and the light transmitting surface is made of any of polyparaxylylenes and fluorine-containing resins. a method of manufacturing a lens to attach a film,
The coating does not contain an ultraviolet absorber,
In the molded the silicone rubber of the lens is washed a low-molecular-weight siloxane with an organic solvent, or under reduced pressure or heated to facilities pretreatment to volatilize the low molecular weight siloxane,
To the light transmitting surface, primer treatment, corona treatment, plasma treatment, after the reforming processing of one of flame treatment, and ultraviolet irradiation treatment, a manufacturing method of a lens, characterized in that to attach the film. Method for producing a lens according to claim 1, wherein to Rukoto said molded with a convex lens or a Fresnel lens. The method for producing a lens according to claim 1, wherein the polyparaxylylene is a chlorine-containing polyparaxylylene. The method for producing a lens according to claim 3, wherein the chlorine-containing polyparaxylylene contains — (CH ₂ ) —C ₆ H ₃ Cl— (CH ₂ ) — as a paraxylylene repeating unit. The method for producing a lens according to claim 1, wherein the silicone is polydimethylsiloxane, polydiphenylsiloxane, or the addition reaction curable silicone of organopolysiloxane and organohydrogenpolysiloxane. To the light transmitting surface, claim that after the reforming by the process, deposition, dipping, spray coating, characterized in that to with spin coating, sputtering, or the coating of the poly-para-xylylene compounds by coating 2. A method for producing the lens according to 1. The method for manufacturing a lens according to claim 1, wherein the coating is applied to the light transmission surfaces on the light incident surface side and the light emission surface side. A method for manufacturing a lighting fixture , wherein the lens manufactured by the method for manufacturing a lens according to claim 1 is arranged in a light emission direction of a flash lamp or an illumination lamp that emits the light.

Images