JP2010181901A - Visible light reflection plate, and electric and electronic device incorporated therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new visible light reflection plate effective for making light from illumination devices and electric and electronic devices emitting light signals much brighter, and to provide the electric and electronic devices incorporated therewith. <P>SOLUTION: The visible light electron plate 1 is obtained by laminating a white resin sheet 5 on a metal plate or a plated metal plate 3, and in which the area ratio of bubbles present on the boundary between the white resin sheet 5 and the metal plate or plated metal plate 3 is ≤5%. The space between the metal plate or plated metal plate 3 and the white resin sheet 5 may comprise a white resin coating film in which the diffusion reflectance of visible light at 555 nm is ≥0.70, or the other face free from the white rein sheet 5 in the metal plate or plated metal plate 3 may comprise a back resin coating film. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a visible light reflector, and is an electric and electronic device such as a lighting apparatus, an AV device, a mobile device, a plasma display, and a liquid crystal television, and has a function of emitting visible light and a reflection of visible light emitted therefrom. The present invention relates to a device having a plate to be made.

  Lighting equipment, AV equipment, electronic equipment, mobile equipment, liquid crystal televisions, plasma displays, etc. have functions such as emitting light to brighten the surroundings, transmitting optical signals, or projecting optical images. . Some of these devices are provided with a reflecting plate and reflect the light on the reflecting plate to improve the luminance of the light, change the direction of the light, and the like. In order to avoid a reduction in the amount of light when light is reflected by the reflecting plate, a high visible light reflectance is required on the reflecting plate surface. Conventionally, as means for increasing the reflectance of the reflecting plate surface, a metal is polished to a mirror surface, or a white paint having a high reflectance is applied. For example, Non-Patent Document 1 also describes a pre-coated steel sheet for a lighting fixture reflector that has been coated with a white paint in advance.

  Patent Documents 1 to 8, Non-Patent Document 2 and the like describe a technique of a reflective sheet in which the diffuse reflectance of visible light is improved by mixing fine bubbles in the resin sheet. As described in Non-Patent Document 2, these reflective sheets are generally used by being attached to a bare metal such as an aluminum plate, a brass plate, a stainless steel plate, or a substrate such as a PET film. .

  On the other hand, with the digitization of electrical products in recent years, there has been a problem of heat generation of electrical products. According to Patent Document 9, the luminance of a fluorescent tube used as a general light source depends on the ambient temperature, and there is a peak temperature at which the luminance is maximum. For this reason, even if the power supplied to the light source is increased, the ambient temperature rises during use, so that the increase in brightness commensurate with the increase in power cannot be obtained, or even if the brightness temporarily increases, the passage of time As a result, there was an inconvenience such as a decrease. As means for solving this thermal problem, Patent Document 9 discloses a technique for improving heat dissipation by providing a vent hole in a reflecting plate. Patent Document 10 discloses a technique for improving heat dissipation by using a metal having high thermal conductivity as a heat dissipation plate. Furthermore, Patent Document 11 discloses a technique for improving heat dissipation by adhering a heat dissipation plate to a lower surface of a light guide plate (reflecting plate) via a heat conductive adhesive layer. However, even in these technologies, there are problems such as an increase in the number of parts, a problem that dust or the like may adhere to internal devices due to the entry of outside air from the ventilation holes, and a heat sink may be attached. Depending on the attaching method, there is a problem that sufficient heat transferability cannot be obtained.

JP 2002-90515 A JP 2002-98808 A JP 2002-98811 A JP 2002-120330 A JP 2001-71441 A JP 2001-121665 A JP 2001-226501 A JP 2001-228313 A JP 2001-297623 A JP-A-5-93910 Japanese Patent Laid-Open No. 10-199320

Nippon Steel Corporation catalog “View Coat” Mitsui Chemicals catalog "White Reflector"

In this way, lighting equipment with visible light reflectors, AV equipment, mobile equipment, plasma displays, liquid crystal televisions, and other electrical and electronic equipment are brighter than they are currently, or even at low power consumption, they are as bright as they are today. In order to maintain the temperature, it is indispensable to release the excess heat to the outside of the equipment by appropriately improving the heat absorption of the reflector itself and to maintain the temperature inside the equipment appropriately.
The present invention seeks to solve this problem by providing a visible light reflector excellent in heat absorption.

The present invention is a visible light reflecting plate excellent in heat absorption, which has been studied and completed by developers, and the gist thereof is as follows.
(1) A white resin sheet is provided on a metal plate or a plated metal plate, and the area ratio of bubbles present at the interface between the white resin sheet and the metal plate or the plated metal plate is 5% or less. A visible light reflector excellent in heat absorption, characterized by
(2) A white resin coating film having a diffuse reflectance of visible light at 555 nm of 0.70 or more between the metal plate or the plated metal plate and the white resin sheet, The visible light reflector according to (1).
(3) The visible light reflecting plate according to (1) or (2), wherein the metal plate or the plated metal plate has a resin coating on the other surface without the white resin sheet.
(4) An electric / electronic apparatus comprising the visible light reflector according to any one of (1) to (3).

  According to the present invention, it is possible to provide a technique for brightening light from a lighting fixture or an electric / electronic device that emits an optical signal. Further, according to the present invention, not only the performance of these devices is improved, it is also possible to ensure the same performance as before with less energy consumption than before, and it is possible to provide energy-saving devices. became. Therefore, it can be said that the present invention is an industrially extremely valuable invention.

It is a schematic diagram explaining the visible light reflector of the 1st aspect of this invention. It is a schematic diagram explaining the visible light reflector of the 2nd aspect of this invention. It is a schematic diagram explaining the visible light reflector of the 3rd aspect of this invention. It is the schematic explaining the apparatus for illumination intensity measurement.

  The present invention provides a reflection plate by laminating a resin sheet on a metal plate or a plated metal plate (hereinafter, “metal plate or plated metal plate” may be simply referred to as “metal plate”), and the interface between them. By making the area ratio of the bubbles present in 5% or less, the influence of air having low thermal conductivity is not observed, and the heat absorption of the reflector is improved. In FIG. 1, the structure of the visible light reflector 1 of this invention is shown. The reflection plate 1 has a white resin sheet 5 laminated on the metal plate 3, thereby improving the heat absorption of the reflection plate and improving the diffuse reflectance. As shown in FIG. 2, when the white resin sheet 5 is laminated on the white resin coating film 7 that covers one surface of the metal plate 3 to form the visible light reflection plate 11, the diffuse reflectance of the reflection plate 11. Is further improved. Moreover, as shown in FIG. 3, when the reflecting plate 21 has the coating of the resin coating film 9 on the other surface of the metal plate 3 on which the white resin sheet 5 is not laminated, the heat absorption of the reflecting plate is further improved. To do.

  In the visible light reflecting plate of the present invention, as the white resin sheet laminated on the metal plate, generally known resin sheets such as polyethylene terephthalate (PET), polyester, polypropylene, vinyl chloride, fluorine, acrylic, polyethylene and the like are various. A resin sheet made of resin can be used. These resin sheets can be made white by a generally known technique such as coloring with a generally known white pigment, for example, titanium oxide, barium sulfate, calcium carbonate or the like, or mixing a large number of fine bubbles. it can. A commercially available white resin sheet may be used. When the visible light diffuse reflectance at 555 nm is 70% or more, the surface of these white resin sheets is more suitable because the reflectivity of the reflector is further improved. If the diffuse reflectance is less than 70%, the reflectivity of the reflector may be insufficient depending on the application. The diffuse reflectance of the white resin sheet can be adjusted by changing the pigment type in the resin, the concentration of the pigment or bubbles, the thickness of the resin sheet, and the like.

  The method for laminating the white resin sheet on the metal plate is not particularly limited as long as it is a method capable of laminating so that the area ratio of bubbles present at the interface between the resin sheet and the metal plate is 5% or less. For example, in JP-A-10-244626, after a resin sheet is thermocompression bonded at a temperature higher than the melting start temperature of the resin sheet and lower than the endothermic peak temperature in the melting, the temperature is raised to the endothermic peak temperature of the resin sheet, The technique which can reduce the bubble entrainment at the time of lamination by performing is disclosed. Japanese Patent Laid-Open No. 8-174670 discloses a width of a metal band from one width end of the metal band toward the other width end along the gap of the crimping start portion generated between the resin sheet and the metal band. There is disclosed a technology for suppressing entrainment of bubbles by laminating a resin sheet on a metal strip with a pressure roll while jetting gas in the direction at a flow rate of 10 m / sec or more and 300 m / sec or less. Bubbles present at the interface between the resin sheet and the metal plate can be measured and detected by ultrasonic microscope photography, as shown in the test method described later. It uses the principle. In this photograph taken by an ultrasonic microscope, since there are ultrasonic reflection parts and non-reflection parts of ultrasonic waves, this is image processed, and by obtaining the area of the ultrasonic reflection part per total area of the reflector, The bubble area ratio (%) is determined. The white resin sheet may be overlapped or pasted after processing the metal plate, or may be processed after being pasted on the metal plate before processing.

  Examples of the visible light reflecting plate of the present invention include those in which a white resin coating film exists between the white resin sheet and the metal plate as described below. In the case of such a reflection plate, a metal plate having a white resin coating film on the surface is regarded as one metal plate (a painted metal plate having a white resin coating surface), and the bubble area ratio at the interface is white. It is set as the bubble area ratio at the interface between the resin sheet and the white resin coating film therebelow.

  Although the thickness of a white resin sheet is not specifically limited, Preferably it is 1-500 micrometers. If it is less than 1 μm, sufficient diffuse reflectance cannot be obtained, and if it exceeds 500 μm, the effect is saturated and it is not economical. A thickness of 20 to 200 μm is more preferable.

  Generally as a metal plate used for the reflecting plate of this invention, a well-known metal plate can be used. For example, a steel plate, an aluminum plate, a titanium plate, a copper plate, etc. are mentioned. A plated metal plate may be used. Examples of the type of plating include zinc plating, aluminum plating, copper plating, nickel plating and the like, and may also be alloy plating. In the case of steel plates, generally known cold-rolled steel plates, hot-rolled steel plates, hot-dip galvanized steel plates, electrogalvanized steel plates, hot-dip galvanized steel plates, aluminum-plated steel plates, aluminum-zinc alloyed steel plates, stainless steel plates, etc. Steel plates and plated steel plates can be applied. A pre-coated metal plate may be used, and in this case, it is more preferable that the metal base material of the pre-coated metal plate is a steel plate or a plated steel plate because the formability is improved.

  These metal plates can be subjected to ordinary treatments such as hot water washing, alkaline degreasing, and pickling before laminating the white resin sheet. Furthermore, phosphorous for the purpose of providing rust prevention and coating adhesion. Generally known chemical conversion treatments such as zinc acid treatment, chromate treatment, and chromate-free chemical conversion treatment can be performed. As chromate-free treatment, JP-A-9-241576, JP-A-10-251509, JP-A-10-337530, JP-A-2000-17466, JP-A-2000-248385, JP-A-2000- No. 273659, JP-A No. 2000-282252, JP-A No. 2000-265282, JP-A No. 2000-167482, JP-A No. 2001-89868, JP-A No. 2001-316845, JP-A No. 2002-60959 Publicly known technology described in Japanese Patent Laid-Open No. 2002-266081, Japanese Patent Laid-Open No. 2002-38280, Japanese Patent Laid-Open No. 2003-253464, a chromate-free treatment agent “CT-E300N” manufactured by Nihon Parkerizing Co., Ltd., etc. Commercially available treatment agents may be used.

  On the metal plate used for the reflector of the present invention, a white resin coating film having a diffuse reflectance of visible light at 555 nm of 0.70 or more is laminated on one surface, and a white resin sheet is laminated thereon. Since the visible light reflectance of the reflector is improved, it is more preferable.

  The white resin coating applied to the metal plate of the present invention is generally a known white resin coating, for example, a polyester resin coating, a melamine resin coating, an acrylic resin coating, a urethane coating, an epoxy coating, a fluororesin. It is possible to use a white paint of a vinyl paint, a vinyl chloride resin paint or the like. A commercially available product may be used.

  Among these generally known coating materials, it is more preferable that the coating material has excellent processability especially for pre-coated metal sheets. As the coating material for the pre-coated metal plate, a polyester coating material or a fluororesin coating material using melamine or isocyanate as a curing agent is more preferable because of excellent workability. The molecular weight of the resin such as polyester resin or fluororesin used for the coating for the precoated metal sheet is preferably 2000 to 50000 in number average molecular weight. If the number average molecular weight is less than 2,000, cracks and peeling are likely to occur in the coating film during processing, and the coating film processability may be inferior. If it exceeds 50,000, it is difficult to dissolve in an organic solvent, It may be difficult to make a paint for application on a metal plate. The number average molecular weight is more preferably 10,000 to 30,000. Further, the glass transition point of the resin used for the coating for the precoated metal sheet is preferably 100 ° C. or less. A glass transition point exceeding 100 ° C. may be inferior in workability of the formed coating film. More preferably, it is 0-50 degreeC. If the glass transition point is too low, the formed coating film is too soft, and coating defects called scratches or pressure marks may occur.

  In the white resin coating film of the present invention, generally known white pigments such as titanium oxide, barium sulfate, zinc white, calcium carbonate and the like can be used. Among these white pigments, titanium oxide has a very high refractive index, and therefore, the diffuse reflectance of visible light of the coating film is further improved, and the visible light reflectivity of the reflecting plate is further improved. Although the addition amount of a white pigment can be arbitrarily selected as needed, 30-60 mass% is more suitable with respect to solid content of a coating film. If it is less than 30% by mass or more than 60% by mass, the visible light diffuse reflectance of the coating film cannot be improved. More preferably, it is 45 mass%-55 mass%. Although the film thickness of a white resin coating film can also be selected arbitrarily as needed, 5-50 micrometers is suitable for a dry film thickness. If the thickness is less than 5 μm, improvement in the visible light diffuse reflectance of the coating film cannot be expected, and if it exceeds 50 μm, the effect is saturated, which is uneconomical. A more preferable film thickness is 10 to 40 μm.

  As described above, the diffuse reflectance of the white resin coating film can be adjusted by changing the pigment type, pigment concentration, and coating film thickness in the coating film. Moreover, you may form the primer coating film aiming at rust prevention or coating adhesion provision under a white coating film as needed.

  The white resin coating film used for the reflector of the present invention is a generally known coating method such as brush coating, spray coating, roll coater coating, curtain flow coater coating, die coater coating, roller curtain coater coating, powder coating, It can be obtained by forming a coating film by electrodeposition coating or the like and drying and baking it. As a method of drying and baking the coating film, generally known methods such as hot air oven baking, direct flame oven baking, induction heating furnace baking, far-infrared furnace baking, UV irradiation, electron beam irradiation and the like can be used. Among these coating and baking methods, roll coater coating, curtain flow coater coating, die coater coating, roller curtain coater coating, etc. are used as coating equipment, and hot-bath ovens, direct-fire ovens, induction heating furnaces, far-infrared furnaces, etc. It is more suitable to paint and bake in a coal coating line or a sheet coating line using, since work efficiency is further improved.

  The reflective plate of the present invention is more preferable because the other surface of the metal plate without the white resin sheet is covered with a resin coating, since the reflected visible light becomes brighter. The reason for this is that the surface of this resin coating (in order to distinguish it from the white resin coating on the opposite side of the metal plate, in the following description, this will be referred to as the “back resin coating”) is compared to the metal surface. Because the infrared emissivity or infrared absorption rate is high, heat (infrared rays) generated from the light source of lighting equipment or equipment that emits optical signals is radiated from the back surface resin coating, and the ambient temperature of the light source decreases, so reflection This is because the visible light reflected by the plate becomes brighter.

  As the back surface resin coating film, generally known resins such as polyester resin, melamine resin, acrylic resin, urethane resin, epoxy resin, fluororesin, vinyl chloride resin and the like can be used. A commercially available product may be used. Among these generally known resin coatings, a resin coating excellent in processability for a pre-coated metal sheet is more preferable. As the coating film for the pre-coated metal plate, a polyester resin or a fluororesin and a type using melamine or isocyanate as a curing agent is more preferable because of excellent workability. The molecular weight of a resin such as a polyester resin or a fluororesin used for the coating film for the precoated metal sheet is preferably 2000 to 50000 in number average molecular weight. If the number average molecular weight is less than 2,000, cracks and peeling are likely to occur in the coating film during processing, and the coating film processability may be inferior. If it exceeds 50,000, it is difficult to dissolve in an organic solvent, It may be difficult to make a paint for application on a metal plate. The number average molecular weight is more preferably 10,000 to 30,000. Further, the glass transition point of the resin used for the coating for the precoated metal sheet is preferably 100 ° C. or less. A glass transition point exceeding 100 ° C. may be inferior in workability of the formed coating film. More preferably, it is 0-50 degreeC. If the glass transition point is too low, the formed coating film is too soft, and coating defects called scratches or pressure marks may occur. The film thickness is not particularly defined and can be adjusted as necessary, but 1 to 50 μm is preferable. If it is less than 1 μm, the expected heat absorption effect cannot be obtained, and if it exceeds 50 μm, the effect is saturated, which is uneconomical.

  You may add substances, such as a pigment with high infrared radiation absorptivity, in a back surface resin coating film. Substances with high infrared radiation absorption include carbon black, charcoal, graphite, aniline black, polymethylene dyes, trisazo dye amine salts, cyanine dyes or metal complexes thereof, anthraquinone substances, phthalocyanine substances, iron oxide, ferrosilicon, etc. Generally known ones can be mentioned.

  The back surface resin coating film can be obtained by forming a coating film by the same method as the coating method of the white resin coating film on the opposite surface, followed by drying and baking.

  The aspect of the reflecting plate 21 provided with the back surface resin coating film is shown in FIG. In the reflection plate of this aspect, the white resin sheet 5 is formed on the white resin coating 7 of the coated metal plate 23 in which the white resin coating 7 is provided on one side of the metal plate 3 and the back resin coating 9 is provided on the opposite side. Exists. In this embodiment, the white resin coating film 7 may be omitted depending on circumstances.

  The electric and electronic equipment incorporating the reflector of the present invention can brighten illumination and optical signals, and can efficiently and stably operate electronic circuits such as a control board provided in the equipment. Examples of the electrical and electronic equipment include lighting equipment, AV equipment, mobile equipment, plasma display, and liquid crystal television.

  EXAMPLES Next, although an Example demonstrates this invention further, this invention is not limited to these examples.

The following paint-1 to paint-4 were prepared.
・ Paint-1
“Byron (trademark) TM GK140” (number average molecular weight: 13000, Tg: 20 ° C.) manufactured by Toyobo Co., Ltd., which is a commercially available organic solvent-soluble amorphous polyester resin (hereinafter referred to as “polyester resin”), is an organic solvent. (A mixed solvent of Solvesso 150 and cyclohexanone having a mass ratio of 1: 1) was dissolved. To the obtained solution, 15 parts by mass of “Cymel (trademark) TM 303” manufactured by Mitsui Cytec Co., Ltd., which is a commercially available hexa-methoxy-methylated melamine, is added to 100 parts by mass (solid content conversion) of the polyester resin. In addition, a commercial acid catalyst, “Catalyst 6003B” manufactured by Mitsui Cytec Co., Ltd., is added in an amount of 0.5 parts by mass (in terms of solid content) and stirred to obtain a melamine-curable polyester-based clear. A paint was obtained. Furthermore, 50 mass% (in terms of solid content) of titanium oxide “Typaque (trademark) TM CR95” manufactured by Ishihara Sangyo Co., Ltd. was added to the prepared clear paint and stirred to obtain paint-1.
Here, what is referred to as “parts by mass” represents the ratio of the additive (in parts) when the state before addition of the additive is 100 parts, and what is referred to as “mass%” The ratio (%) of the additive when the state after adding the additive is 100% is shown.
・ Paint-2
A clear paint was prepared in the same manner as paint-1, and 35% by mass (in terms of solid content) of titanium oxide “Typaque TM CR95” manufactured by Ishihara Sangyo Co., Ltd. was added thereto and stirred to obtain paint-2. .
・ Paint-3
The gray color of “FL100HQ”, which is a paint for precoated steel sheets manufactured by Nippon Fine Coating, was used.
・ Paint-4
6 parts by mass of GRACE chromate-free rust preventive pigment “Sealdex C303” with respect to 100 parts by mass of resin solids in the clear paint of FLC641 which is a polyester primer paint made by Nippon Fine Coating 26 parts by mass (in terms of solid content) of titanium oxide “Typaque (trademark) TM CR95” manufactured by Ishihara Sangyo Co., Ltd. was added and stirred to obtain a primer paint.

A reflector was produced by the method shown below.
The metal plate having a thickness of 0.6 mm was alkali degreased in a 60 ° C. aqueous solution obtained by diluting “FC4336” manufactured by Nippon Parkerizing Co., Ltd., which is a commercially available alkali degreasing agent, to a concentration of 2% by mass, washed with water and dried.

The metal plates used are as follows.
EG: Commercially available electrogalvanized steel sheet (Zinc adhesion amount: 20 g / m ^{2 on} one side, material: SECE (JIS G 3313))
・ Al: Commercially available aluminum plate (Material: 1100 (JIS H 4000))

The used white resin sheet was produced as follows. The thickness of the pasted resin sheet was 200 μm.
(1) White PP-1 sheet 30% by mass of Ishihara Sangyo Co., Ltd. titanium oxide "Taipaque TM CR95" is added to "IDEMITSU PPF-734NP" manufactured by Idemitsu Petrochemical Co., Ltd., which is a commercially available polypropylene resin, and mixed uniformly. The material that has been sufficiently vacuum dried is supplied to an extruder equipped with a T-shaped die for sheet forming, melt extruded at a temperature not lower than the temperature at which the resin melts and not higher than the temperature at which the resin decomposes, and led to a chill roll and a take-off roll A white PP-1 sheet was obtained.
(2) White PP-2 sheet “Idemitsu PPF-734NP” made by Idemitsu Petrochemical Co., Ltd. 15% by mass of titanium oxide “Taipaque TM CR95” made by Ishihara Sangyo Co., Ltd. was added and mixed uniformly, and sufficiently dried in vacuum. Is supplied to an extruder equipped with a T-shaped die for sheet forming, melt-extruded at a temperature not lower than the temperature at which the resin melts and not higher than the temperature at which the resin decomposes, and is led to a chill roll and a take-off roll. Obtained.

  When the thermal analysis of the resin sheet used for the test was performed with a differential scanning calorimeter (DSC) in advance, both the white PP-1 and the white PP-2 had a melting start temperature of 210 ° C. and an endothermic peak temperature in melting of 260. ° C.

Based on the characteristic temperature of this resin, each resin was thermocompression bonded to a metal plate at 210 ° C. by a thermocompression-bonding roll lined with silicon rubber. Then, it heated up to 265 degreeC using the temperature rising apparatus, and it repressed by the surface pressure of 500 kgf / cm < ² > (49MPa) with the silicon rubber-lined recompression roll, and produced the reflecting plate. Further, as a comparative example, a reflective plate was produced by a conventional laminating method using the above-described metal plate and resin sheet, that is, a method of laminating at an endothermic peak temperature or higher during melting of the resin.

  The white coated pre-coated metal plate and the reflector with the white resin sheet attached to one side thereof were prepared as follows.

In a 60 ° C. aqueous solution obtained by diluting a metal plate having a thickness of 0.6 mm (the above-described electrogalvanized steel sheet EG or aluminum plate Al) with a commercially available alkaline degreasing agent “FC4336” manufactured by Nippon Parkerizing Co., Ltd. to a concentration of 2% by mass. It was degreased with alkali, washed with water and dried. Next, “CT-E300” manufactured by Nippon Parkerizing Co., Ltd., which is a commercially available chromate-free chemical conversion treatment agent, was applied to both surfaces of the metal plate with a roll coater, and dried under the condition that the ultimate plate temperature was 60 ° C. The adhesion amount was 150 mg / m ² as the total solid content of the coating film. Subsequently, on one side of the metal plate that has been subjected to chemical conversion treatment, paint-4, which is a primer paint, has a dry film thickness of 10 μm, and on the other side (hereinafter referred to as “back surface”), paint-3 has a dry film thickness. Each was coated with a roll coater at 5 μm, and dried and cured in an induction heating furnace combined with hot air. The drying and curing conditions were 210 ° C. at the ultimate plate temperature (PMT). On the surface coated with the primer paint, paint-1 or paint-2 was applied with a roll coater and dried and cured in an induction heating furnace combined with hot air. The drying and curing conditions were 230 ° C. at the ultimate plate temperature (PMT).

  Next, the above-mentioned white resin sheet was affixed on the produced precoat metal plate by thermocompression bonding to produce a reflection plate. As a comparative example, a reflection plate in which a resin sheet was not attached to a precoated metal plate was produced.

  Table 1 shows the details of the manufactured reflector.

The following evaluation tests were performed on each of the manufactured reflectors.
1) Measurement of visible light diffuse reflectance of white surface of precoated metal plate and white resin sheet Attaching an integrating sphere reflection accessory to a spectrophotometer “UV265” manufactured by Shimadzu Corporation, and attaching the white surface of the precoated metal plate The diffuse reflectance of visible light at 555 nm of the previous white resin sheet was measured. The measurement results are shown in Table 1.

2) Measurement of bubble area ratio Using an ultrasonic microscope “ACOUSTIC MICROSCOPE UH3” manufactured by Olympus, photographing the generation state of bubbles at the white resin sheet-metal plate interface with a lens unit: 200 NHz, ATTENUATION: 15 db, and a shooting magnification of 120 × Then, the area ratio of the bubbles was determined using an image analysis processing apparatus. In addition, the measurement was performed at arbitrary five points on the reflector, and the average was obtained. The measurement results are shown in Table 1.

3) Illuminance measurement of lighting equipment FIG. 4 shows an outline of the experimental apparatus. A commercially available fluorescent lamp luminaire 42 was attached in a wooden box 41, and a commercially available illuminometer sensor 45 was installed at a location 30 cm away from the fluorescent lamp 43. The fluorescent lamp 43 used in the experiment was a 16-type lamp output 16 W fluorescent lamp. At the time of measurement, the reflector (hereinafter referred to as “existing reflector”) 47 attached to the fluorescent lamp illuminator is removed, and various reflectors shown in Table 1 are used to make the same shape as the existing reflector. The measurement reflector 47 ′ was prepared, and the illuminance when the existing reflector 47 ′ was attached and when the prepared reflector 47 ′ was attached was measured and evaluated as follows.
When the illumination change rate is 110% or more: ○
When the illuminance change rate is 103% or more and less than 110%:
When the illuminance change rate is less than 103%: ×
The rate of change in illuminance was defined as follows.
Illuminance change rate (%) = ([illuminance on the manufactured reflector for measurement] / [illuminance on the existing reflector]) × 100
The obtained results are shown in Table 2.

4) Reflector bending test The 90 ° bend is performed in a 20 ° C atmosphere so that the white resin sheet attachment surface of the manufactured reflector is on the outside, and the damaged and peeled state of the resin sheet in the processed part is visually observed. Observed and evaluated processability according to the following criteria. The reflector was processed to 0 mm inside the test piece (generally called 0 mmR bending).
If the appearance is not damaged at all: ○
If the resin sheet or coating is partially damaged or peeled: △
If the resin sheet or coating is severely damaged or peeled: ×
The obtained results are shown in Table 2.

5) Corrosion resistance test of reflecting plate A cross-cut wound reaching the base metal was put on the white resin sheet affixing surface of the prepared reflecting plate, and a salt spray test was carried out by the method described in JIS K 5540.9.1. The salt water was sprayed on the cross cut surface of the test piece. The test time was 72 hours. The coating film swelling width from the cut part on the surface side was measured, and the corrosion resistance was evaluated based on the criteria that the cut part swelling width was 3 mm or less on one side and the cut part swelling width was more than 3 mm on one side. . The obtained results are shown in Table 2.

6) Temperature measurement in the vicinity of the lighting fixture As shown in FIG. 4, a thermocouple 49 was provided at a position 10 cm below the fluorescent lamp 43, and the temperature 60 minutes after the fluorescent lamp 43 was energized was measured. The obtained results are shown in Table 2.

  From Table 2, the lighting fixture using the reflector of the present invention is a metal plate with a white resin sheet pasted by a conventional method (the bubble area ratio is not controlled and shows a bubble area ratio exceeding 5%). Compared to a luminaire using a reflector, the temperature in the vicinity of the light source decreases and the rate of change in illuminance also increases. In addition, the reflector of the present invention is preferable because the illuminance change rate is higher than that of a conventional reflector obtained by simply applying a white coating to a metal plate.

1, 11, 21 Visible light reflection plate 3 Metal plate 5 White resin sheet 7 White resin coating film 9 Back surface resin coating film

Claims (4)

  A white resin sheet is provided on a metal plate or a plated metal plate, and the area ratio of bubbles existing at the interface between the white resin sheet and the metal plate or the plated metal plate is 5% or less. Visible light reflector with excellent heat absorption.   The white resin coating film having a diffuse reflectance of visible light at 555 nm of 0.70 or more between the metal plate or the plated metal plate and the white resin sheet. The visible light reflector according to the description.   The visible light reflector according to claim 1, wherein the metal plate or the plated metal plate has a resin coating on the other surface without the white resin sheet.   An electrical and electronic apparatus in which the visible light reflector according to claim 1 is incorporated.

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