JP2009238509A - Lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus in which irradiation unevenness at the irradiation face is prevented without deteriorating the apparatus efficiency even at low cost. <P>SOLUTION: The lighting apparatus 1 includes a light source 3 and a reflecting mirror 4 to reflect light from the light source 3. The light source 3 has a base 31 and an outer tube 33 which extends from the base 31 and in which an arc tube 32 is installed. The reflecting mirror 4 has a first reflecting surface 41 (range shown in dotted line in the figure) which is a portion to be near the base 31 of the light source 3 and a second reflecting surface 42 (range shown in one dotted line in the figure) which is all portions other than the first reflecting surface 41 including the portion close to the arc tube 32. The first reflecting surface 41 and the second reflecting surface 42 have a covered layer for smoothing the reflecting surface. The surface roughness of the covered layer of the first reflecting surface 41 is made larger than that of the covered layer of the second reflecting surface 42. Accordingly, the first reflecting surface 41 is made a rough surface without deteriorating the total light reflection factor and made the reflective surface of nearly diffusion state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a luminaire provided with a reflecting mirror that reflects light from a light source, and more specifically to a downlight or the like that is embedded in a ceiling or wall of a building.

  In recent years, in a lighting device such as a downlight, a spotlight, or a projector, a reflecting mirror having a highly reflective light reflecting layer has been put into practical use in order to improve the device efficiency. As such a reflector, an undercoat layer made of a coating film is formed on a substrate made of glass, plastic, metal, ceramic or the like molded into a predetermined shape, and silver, silver alloy, aluminum, or the like is formed on this layer. There is one in which a light reflecting layer is formed by a vacuum deposition method, a sputtering method, an ion plating method, or the like (for example, see Patent Document 1). A top coat layer that protects the light reflection layer is formed on the formed light reflection layer.

  By the way, in the reflecting mirror having the light reflecting layer as described above and having a substantially mirror surface state, when a light source disposed in the reflecting mirror is turned on, a non-light-emitting member such as a stem existing inside the light source is turned into the reflecting mirror. Irradiation unevenness occurs due to reflection, a drop-out phenomenon in which the approximate center of the irradiated surface becomes dark, and the like. Therefore, as a technique for solving the above-described problem, there is a method in which the outer tube of the light source made of glass is made frosted (matted). However, in such a method, the luminous flux emitted from the light source is reduced, and the instrument efficiency is lowered.

As another method for solving the above problem, a method of roughening a part of the base material of the reflecting mirror by a shot blast method or the like, or a dimple shape or a facet shape is imparted to a part of the base material of the reflecting mirror. There is a way. Furthermore, there is a method in which fine particles are added to the coating composition constituting the undercoat layer or the topcoat layer to make the high-brightness light reflecting layer matt. Furthermore, in order to diffusely reflect light from a light source, there is a reflecting mirror composed of a plurality of fish-eye elements whose reflecting surfaces are allocated on multiple parabolas (for example, see Patent Document 2). In these inventions, the light from the light source is diffusely reflected by the reflecting mirror, so that irradiation unevenness on the irradiation surface can be suppressed. However, the reflectance of the reflecting mirror is reduced, and the efficiency of the instrument is reduced and the cost is increased. To do.
JP 2004-291492 A JP-A-9-231812

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a lighting apparatus that can prevent irradiation unevenness on an irradiation surface without lowering the efficiency of the apparatus while being low in cost. To do.

  In order to achieve the above object, the invention of claim 1 is a luminaire comprising a light source and a reflecting mirror that reflects light from the light source, wherein the light source extends from a base part and the base part. And the reflecting mirror has a first reflecting surface proximate to the base portion and a second reflecting surface proximate to the arc tube portion, the first reflecting surface The reflective surface and the second reflective surface have a coating layer for smoothing the reflective surface, and the surface roughness of the coating layer of the first reflective surface is that of the coating layer of the second reflective surface. It is bigger than that.

  According to a second aspect of the present invention, in the first aspect of the invention, the thickness of the coating layer of the first reflective surface is smaller than the thickness of the coating layer of the second reflective surface.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, each coating layer of the first reflective surface and the second reflective surface is made of a material in which a soft segment and a hard segment are copolymerized. It consists of.

  According to the first aspect of the present invention, since the surface roughness of the coating layer of the first reflecting surface is larger than that of the coating layer of the second reflecting surface, the total light reflectance of the first reflecting surface is lowered. Thus, the surface is roughened and becomes a substantially diffused reflecting surface. Therefore, it can suppress that non-light-emitting members, such as a stem located in the base part side in a light source, are reflected in a 1st reflective surface, and generation | occurrence | production of the irradiation nonuniformity in an irradiation surface can be prevented, without reducing an instrument efficiency. Moreover, since it is not necessary to process the shape of the reflecting mirror in a complicated manner, the cost is low.

  According to invention of Claim 2, since the thickness of the coating layer of a 1st reflective surface is thinner than the thickness of the coating layer of a 2nd reflective surface, generation | occurrence | production of the irradiation nonuniformity on an irradiation surface can be prevented more reliably.

  According to the invention of claim 3, since each coating layer of the first reflecting surface and the second reflecting surface is made of a material in which soft segments and hard segments are copolymerized, the reflecting mirror has self-healing properties. Thus, when the dust and dirt adhering to the reflecting mirror are removed by wiping and cleaning, no scratches remain on the first reflecting surface and the second reflecting surface. Therefore, the aesthetics of the instrument can be maintained and the occurrence of glare due to scratches or the like can be suppressed.

  The lighting fixture which concerns on one Embodiment of this invention is demonstrated with reference to drawings. FIG.1 and FIG.2 shows schematic structure of the lighting fixture 1 which concerns on this embodiment. The luminaire 1 is a downlight embedded in a ceiling 2 of a building, and is formed integrally with the light source 3, the reflecting mirror 4 that reflects light from the light source 3, and the reflecting mirror 4, and is mounted with the light source 3. And a top plate 6 extending on the top of the socket 5. The light source 3 includes a base part 31 screwed into the socket part 5, and an outer tube part 33 extending from the base part 31 and having an arc tube part 32 provided inside a vacuum. The reflecting mirror 4 is formed in a substantially funnel shape so as to surround the periphery of the light source 3. A frame 7 and a spring member 8 are provided on the outer peripheral edge of the reflecting mirror 4, and the ceiling 2 is moved up and down by the frame 7 and the spring member 8 in a state where the reflecting mirror 4 is inserted into a hole 21 formed in the ceiling 2. When it is sandwiched, the lighting fixture 1 is fixed to the ceiling 2. The top plate 6 is provided with a ballast 9 for turning on the light source 3.

  Here, the reflecting mirror 4 includes a first reflecting surface 41 (a range indicated by a dotted line in the drawing) that is a part close to the base part 31 of the light source 3 installed therein and a part that is close to the arc tube part 32. And the second reflecting surface 42 (the range indicated by the alternate long and short dash line in the figure), which is the entire portion except for the first reflecting surface 41.

  FIG. 3 shows a detailed configuration of the light source 3. In the present embodiment, the light source 3 is a high-pressure sodium lamp that emits light due to a discharge phenomenon in sodium vapor in a high-pressure state. The arc tube portion 32 is filled with mercury, a rare gas, and sodium. The outer tube portion 33 is made of transparent glass. In addition to the arc tube portion 32, the outer tube portion 33 includes a stem 34, a getter 35, a starting unit 36, a starting aid as components for causing the arc tube portion 32 to emit light. A conductor 37 and the like are provided. Many of these components are located on the socket side inside the outer tube portion 33. Here, when power is supplied to the light source 3 through the ballast 9, the arc tube portion 32 emits light, but the components of the light source 3 other than the arc tube portion 32 do not emit light. The light source 3 is not limited to a high-pressure sodium lamp, and may be a halogen lamp, an incandescent lamp, a fluorescent lamp, or the like.

  FIG. 4 shows a specific configuration of each part constituting the reflecting mirror 4. The reflecting mirror 4 includes a base material 43 formed in a predetermined shape based on a material such as resin, metal, or glass, and an optical multilayer film 44 laminated on the inner side of the base material 43. The optical multilayer film The uppermost layer surface 44 is the first reflecting surface 41 and the second reflecting surface 42 described above. The optical multilayer film 44 includes an undercoat layer 45 formed on the inner surface of the substrate 43, a light reflecting layer 46 formed on the undercoat layer 45, and a top coat layer 47 formed on the light reflecting layer 46. And a coating layer 48 formed on the topcoat layer 47.

  The base material 43 is not particularly limited as long as it can be used at a heat-resistant temperature determined for the lighting fixture 1 and can reflect the light emitted from the light source 3 by being laminated with the optical multilayer film 44. It is not something. Here, the case where resin is used for the base material 43 is demonstrated. The resin used for the base material 43 may be either a thermoplastic resin or a thermosetting resin. Examples of the thermoplastic resin material used as the base material 43 include polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyphenylene sulfide (PPS), polyphenylene oxide (PPO), and thermoplastic polyimide (PI). ), Polyetherimide (PEI), polycarbonate (PC), liquid crystal polymer (LCP), syndiotactic polystyrene (SPS), and the like. Examples of the thermosetting resin material used as the base material 43 include unsaturated polyester (UP) that is generally used as a bulk molding compound (BMC) material. Further, in order to improve the heat resistance, strength, light resistance, etc. of the base material 43, various additives such as an inorganic filler may be added to the above-mentioned thermoplastic resin material or thermosetting resin material, and a plurality of additives may be added. The thermoplastic resin material may be mixed by a polymer blend or may be block copolymerized by a compatibilizer. The molding method of the resin material is not particularly limited as long as it is a method generally used in resin molding. Examples of the molding method include injection molding, compression molding, vacuum molding, and pneumatic molding. Can be mentioned.

  Next, the case where a metal is used for the base material 43 will be described. Examples of the metal material used as the base material 43 include an Al-based alloy, an Mg-based alloy, and an Fe-based alloy. The forming method of the metal material is selected in consideration of the characteristics of the material, the shape of the reflecting mirror 4, and the like, and examples of the forming method include spinning processing, press processing, die casting, and thixomolding.

  Next, the case where glass is used for the base material 43 will be described. Examples of the glass material used as the base material 43 include quartz glass. The method for forming the glass material is not particularly limited, and examples of the forming method include press working and blow working. In addition, when the base material 43 is molded based on the above-described resin material, metal material, glass material, etc., when there are deposits such as processing oil, mold release agent, gas, etc. at the time of molding on the surface of the base material 43 Needless to say, the deposit is removed by a physical or chemical method.

  The undercoat layer 45 relieves internal stress generated between the base material 43 and the light reflection layer 46 and improves the adhesion between the base material 43 and the light reflection layer 46. For the undercoat layer 45, for example, an acrylic resin type, an epoxy resin type, a urethane resin type, a modified silicone resin type, a polybutadiene resin type, or a white type paint containing a white pigment such as titanium oxide is used. The formation method of the undercoat layer 45 is not particularly limited, and examples of the formation method include a spray method, a dipping method, and an electrostatic coating method. The thickness of the undercoat layer 45 is not particularly limited as long as the desired adhesion is obtained.

  The light reflecting layer 46 reflects light emitted from the light source 3 with high efficiency, and is particularly a material known as a material for forming the light reflecting layer 46 such as an Al material, an Ag material, or an alloy thereof. It is not limited. Among them, an Al material or an Al-based alloy, which is inexpensive as compared with the Ag material and has stable reflection characteristics and hardly discolors at high temperatures, is preferable as the material for the light reflecting layer 46. Examples of the method for forming the light reflecting layer 46 include a vacuum deposition method, a sputtering method, an ion plating method, and an ion assist method. The film thickness of the light reflecting layer 46 is generally preferably 10 to 30 nm, but may be beyond this range as long as the desired strength and light reflectance can be obtained.

  The topcoat layer 47 is not particularly limited as long as it protects the light reflecting layer 46 and can provide desired heat resistance and adhesion to the light reflecting layer 46. Among these, a straight silicone-based inorganic paint that is not easily affected by heat and light from the light source 3 is preferable as the top coat layer 47. The film thickness of the topcoat layer 47 formed of a straight silicone-based inorganic paint is desirably 10 μm or less. In the case of the top coat layer 47 formed in such a film thickness range, the base material 43 has a complicated three-dimensional shape, and a large temperature difference occurs in the base material 43 due to the light source 3 being turned on / off. Even so, the occurrence of cracks in the topcoat layer 47 due to expansion / contraction of the reflecting mirror 4 can be suppressed.

  The coating layer 48 covers the top coat layer 47 and smoothes the first reflective surface 41 and the second reflective surface 42 that are the uppermost layer surfaces of the optical multilayer film 44. The coating layer 48 is composed of a composition in which a soft segment having flexibility and a hard segment having hardness are copolymerized. The coating layer 48 may contain components other than the above-described composition, and the above-described composition includes a known leveling agent, coupling agent, antifoaming agent, matting agent, ultraviolet absorber, antioxidant, and the like. What added the additive as needed may be used. Specific examples of the composition that forms the coating layer 48 include, for example, those composed of an acrylic urethane-based soft paint and a polydimethylsiloxane-based copolymer, a polydimethylsiloxane-based copolymer, polycaprolactone, and a polysiloxane-based urethane or melamine. What consists of a crosslinked body and what consists of an acrylic resin and a polyisocyanate compound are mentioned. Here, the surface roughness of the covering layer 48 of the first reflecting surface 41 is made larger than that of the covering layer 48 of the second reflecting surface 42, and the thickness of the covering layer 48 of the first reflecting surface 41 is The thickness of the coating layer 48 of the second reflecting surface 42 is made thinner.

  Next, one example embodying the above-described embodiment and two comparative examples for comparison will be described.

Example 1
An Al material (JIS standard: A1050) was processed into a predetermined reflecting mirror shape by spinning processing to obtain a base material 43, and then the base material 43 was degreased and cleaned with an alkaline cleaner. Next, a straight silicone resin (trade name: SH-804, manufactured by Toray Dow Corning) is spray-coated on the inner surface of the base material 43, and then baked and dried at 220 ° C. for 30 minutes to form an undercoat layer 45 having a film thickness of 15 μm. did. And Ag (purity 99.99%) was vapor-deposited on the surface of this undercoat layer 45 by DC magnetron sputtering method, and the light reflection layer 46 with an average film thickness of 800 mm was formed. Further, a straight silicone resin similar to the undercoat layer 45 was spray-coated on the surface of the light reflecting layer 46 and baked and dried at 200 ° C. for 30 minutes to form a topcoat layer 47 having a film thickness of 15 μm.

  Finally, a two-component acrylic urethane paint (product name: self-healing clear No. 100, manufactured by NATCO) is spray-coated on the surface of the top coat layer 47, and then baked and dried at 120 ° C. for 15 minutes to provide a first reflection. A coating layer 48 having a thickness of 4 μm was formed on the surface 41, and a coating layer 48 having a thickness of 10 μm was formed on the second reflecting surface 42. Here, as a result of spray coating the coating material from the direction parallel to the central axis of the reflecting mirror 4, the surface roughness of the coating layer 48 of the first reflecting surface 41 is the second reflection due to the leveling property of the coating material. It became larger than the surface roughness of the coating layer 48 of the surface 42.

(Comparative Example 1)
The undercoat layer 45, the light reflecting layer 46, and the top coat layer 47 were formed on the same base material 43 as in Example 1 to obtain a reflecting mirror.

(Comparative Example 2)
A reflective mirror was obtained in the same manner as in Comparative Example 1 except that the top coat layer 47 was prepared by adding 5 wt% of silica particles having an average particle size of 3 μm to the straight silicone resin.

  About the sample produced as mentioned above, the evaluation test was implemented about the total light reflectance, diffuse reflectance, instrument efficiency, scratch resistance, and the irradiation nonuniformity in an irradiation surface. These test methods are described below. In the evaluation test of total light reflectance and diffuse reflectance, the total light reflectance and diffuse reflectance at 555 nm were measured using a self-recording spectrophotometer U-4000 manufactured by Hitachi High Technology. In the evaluation test of the instrument efficiency, when a light source 3 is mounted on the socket part 5 and turned on using a predetermined light distribution measuring device, the light beam emitted outside the instrument and the light source 3 are turned on alone The total luminous flux radiated to was measured and the ratio of these was obtained. In the scratch resistance evaluation test, using a JIS standard cotton cloth, the first reflective surface 41 and the second reflective surface 42 are rubbed 100 times with a load of 1 kgf / cm 2, and the first reflection after rubbing. The degree of scratching on the surface 41 and the second reflecting surface 42 was visually evaluated. In the irradiation unevenness evaluation test on the irradiated surface, the lighting fixture 1 was installed on the ceiling 5 m above the floor surface, the light source 3 was turned on, and the state of the irradiated light irradiated on the floor surface was visually evaluated. Next, Table 1 shows the results of the above-described evaluation tests for Example 1 and Comparative Examples 1 and 2, and the film thickness of the coating layer 48 described above.

  In the results of the scratch resistance evaluation test, “◯” indicates that no scratches or the like are observed on the first reflecting surface 41 and the second reflecting surface 42, and “×” indicates the first reflecting surface 41. In addition, scratches and the like are clearly recognized on the second reflecting surface 42. In the result of the irradiation unevenness evaluation test, “◯” indicates that no irradiation unevenness is observed on the irradiated surface, and “×” indicates that the irradiation unevenness is clearly recognized on the irradiated surface. As can be seen from Table 1, the lighting fixture provided with the reflecting mirror 4 of Example 1 has high fixture efficiency and scratch resistance with respect to each comparative example, and has no irradiation unevenness on the irradiation surface. .

  As mentioned above, according to the lighting fixture 1 which concerns on this embodiment, the 1st reflective surface 41 is roughened without a total light reflectance falling, and becomes a reflective surface of a substantially diffused state. Therefore, it is possible to prevent non-light emitting members such as the stem 34 located on the base part 31 side in the light source 3 from being reflected on the first reflecting surface 41, and to prevent irradiation unevenness on the irradiation surface without reducing the instrument efficiency. Occurrence can be reliably prevented. Moreover, since it is not necessary to process the shape of the reflecting mirror 4 in a complicated manner, the cost is low. Moreover, since each coating layer 48 of the 1st reflective surface 41 and the 2nd reflective surface 42 consists of the material by which the soft segment and the hard segment were copolymerized, the reflective mirror 4 will have a self-healing property, and reflective When the dust and dirt adhering to the mirror 4 are removed by wiping and cleaning, no scratches remain on the first reflecting surface 41 and the second reflecting surface 42. Therefore, the aesthetics of the instrument can be maintained and the occurrence of glare due to scratches or the like can be suppressed.

  In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, if the base material 43 itself has a desired reflectance, it is not necessary to form the undercoat layer 45, the light reflection layer 46, and the topcoat layer 47 on the surface of the base material 43. Further, instead of forming the undercoat layer 45, the light reflecting layer 46, and the topcoat layer 47 on the surface of the base material 43, a plating treatment with chromium, silver, or the like may be performed.

The perspective view which shows the lighting fixture which concerns on one Embodiment of this invention. Side surface sectional drawing which shows the said lighting fixture. The side view which shows the light source of the said lighting fixture. Sectional drawing which shows the structure of the reflective mirror of the said lighting fixture.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lighting fixture 3 Light source 4 Reflective mirror 31 Base part 32 Light emitting tube part 41 1st reflective surface 42 2nd reflective surface 48 Coating layer

Claims (3)

A lighting apparatus comprising a light source and a reflecting mirror that reflects light from the light source,
The light source has a base part and an arc tube part extending from the base part,
The reflecting mirror has a first reflecting surface close to the base part and a second reflecting surface close to the arc tube part,
The first reflective surface and the second reflective surface have a coating layer for smoothing the reflective surface,
The lighting apparatus according to claim 1, wherein a surface roughness of the covering layer of the first reflecting surface is larger than that of the covering layer of the second reflecting surface.   2. The lighting fixture according to claim 1, wherein a thickness of the coating layer of the first reflecting surface is smaller than a thickness of the coating layer of the second reflecting surface.   3. The lighting apparatus according to claim 1, wherein each of the coating layers of the first reflecting surface and the second reflecting surface is made of a material in which a soft segment and a hard segment are copolymerized.

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