JP2003016821A - Lamp reflector, and reflector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection sheet using silver exhibiting high reflectance as a reflection layer having excellent light stability and wet-heating durability, and to provide a lamp reflector precluded from generating any bright line, using the reflection sheet. SOLUTION: This lamp reflector 2 is worked, using a reflector 1 provided by bonding the reflecting sheet constituted of at least three layers constituted of a substrate layer 30, a metal layer 20 constituted mainly of silver, and a protection layer 10, in the order on a polymer film 40, with a molding by an adhesive, using the polymer film 40 side as a bonding face.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a reflector formed by laminating silver on a polymer film and a lamp reflector using the same. More specifically, the present invention relates to a reflector having a multilayer structure mainly composed of silver, which is excellent in light resistance and wet heat resistance, and a lamp reflector using the same.

[0002]

2. Description of the Related Art Conventionally, a highly reflective aluminum material such as a mirror-polished aluminum plate or an aluminum vapor-deposited sheet has been used as a reflector for a fluorescent lamp or an incandescent lamp. In recent years, a reflector made of silver, which has a higher reflectance than aluminum in the visible light region as a reflective layer, has been used mainly for a lamp reflector of a backlight part of a liquid crystal display device and as a reflector for a fluorescent lamp. .

These reflectors are so-called silver reflectors composed of PET (polyethylene terephthalate) / silver thin film layer / adhesive layer / aluminum plate, or PET / silver thin film layer / white coating /
A so-called silver reflective sheet consisting of an adhesive layer / aluminum vapor deposition layer / polymer film / white coating is subjected to a predetermined process such as bending before use.

[0004]

However, silver is discolored due to sulfidation and oxidation in the atmosphere, compared with aluminum.
In addition, there is a problem in that the reflectance is lowered accordingly.
Therefore, a method has been developed in which PET, which is a transparent polymer film, is used as a silver protective layer to prevent sulfidation and oxidation of silver due to exposure to the atmosphere and maintain high reflectance (Japanese Patent Laid-Open No. 5-177758). Japanese Patent Application Laid-Open No. 9-1504
82 publication). For example, taking the reliability of the silver reflector as an example, no blackening due to sulfidation is observed even at a high temperature (80 ° C.), and no decrease in reflectance is observed. However, at a high temperature of 80 ° C., silver changes color to purple in hundreds to thousands of hours, and the reflectance sharply decreases. Further, in the moist-heat resistance test (60 ° C., relative humidity 90%), a large number of dot-shaped white spots occur, and there is a problem that the reflectance decreases.

Further, when the above silver reflector is used for a lamp reflector of a sidelight type backlight for a liquid crystal display device, high brightness can be obtained, but a bright line is generated with an increase in brightness and the display quality as a display is improved. There was a problem of decline.

An object of the present invention is to provide a reflector which uses silver having a high reflectance in a reflective layer and is excellent in light resistance and wet heat resistance and which does not cause a bright line when used in a backlight device, for example. It is to provide a lamp reflector using the same.

[0007]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have surprisingly found that an underlayer, a silver layer and a transparent oxide layer are formed on a polymer film. It was found that the above-mentioned problems can be solved by bonding the reflector having the three layers described above to the molded body with the polymer film side as the adhesive surface. Further, the present invention has been completed.

The present invention provides a lamp reflector having at least a base layer (A), a base layer (B), a metal layer (C) containing silver as a main component, and a protective layer (D) made of an inorganic material. The lamp reflector is characterized by having a total reflectance of 90% or more at a wavelength of 550 nm after irradiation with pseudo sunlight having an irradiation intensity of 500 mW / cm ² from a reflective layer side at a temperature of 100 ° C. for 300 hours. .

According to the present invention, a lamp reflector having a high reflectance and a high durability can be obtained, and when the lamp reflector is provided in a backlight of a liquid crystal display device or the like, it has a high brightness and a high quality with no bright lines. It is possible to realize an image.

In the present invention, the underlayer (B) is a simple substance of a metal selected from gold, copper, nickel, iron, cobalt, tungsten, molybdenum, tantalum, chromium, indium, manganese, titanium, or palladium, and / or Or it is made of an alloy consisting of two or more of these and has a thickness of 5 nm.
Metal layer of 50 nm or more and 50 nm or less and / or a thickness of 1 nm
It is characterized by being a metal salt layer or a metal oxide layer having a thickness of 20 nm or less.

According to the present invention, a sufficient barrier effect can be obtained, and no aggregation occurs during the formation of a metal layer composed mainly of silver,
Also, the adhesion between the base material and the reflective layer is excellent.

According to the present invention, a metal layer (C) mainly composed of silver is used.
Is composed of silver alone or an alloy mainly composed of silver, and the thickness of the layer is 70 nm or more and 400 nm or less. According to the present invention, a desired reflectance can be realized with a metal layer having a sufficient thickness.

The present invention is a protective layer (D) made of an inorganic material.
But gold, copper, nickel, iron, cobalt, tungsten,
A metal layer having a thickness of 5 nm or more and 50 nm or less and / or a thickness made of a simple substance of a metal selected from molybdenum, tantalum, chromium, indium, manganese, titanium, or palladium and / or an alloy of two or more of these. The transparent oxide layer has a thickness of 1 nm or more and 20 nm or less.

According to the present invention, a sufficient barrier effect can be obtained, and no aggregation occurs during the formation of the metal layer mainly composed of silver.

In the present invention, the ratio of the sum of the thicknesses of the underlayer (B) and the protective layer (D) to the thickness of the layer (C) mainly containing silver is 0.0.
It is characterized by being 05 to 0.3.

According to the present invention, at low cost, formability,
It is possible to obtain a lamp reflector with excellent durability.

The present invention is characterized in that the surface of the base material (A) opposite to the reflective layer has an uneven shape.

According to the present invention, it is possible to improve the operability and the adhesive force when the reflective layer is attached to a support or the like.

The present invention is characterized in that the support further comprises a plate or sheet made of metal or polymer.

According to the present invention, it is possible to impart characteristics such as high strength, high heat dissipation and high conductivity to the lamp reflector.

The present invention is characterized in that the radius of curvature on the reflective layer side is 5 mm or less. According to the present invention, the lamp reflector has excellent moldability, fine processing can be performed, and the backlight can be miniaturized.

The present invention has at least a base layer (A), a base layer (B), a metal layer (C) containing silver as a main component, and a protective layer (D2) containing a transparent oxide as a main component. , Temperature 1
A reflector having a total reflectance of 90% or more at a wavelength of 550 nm after irradiation with pseudo sunlight having an irradiation intensity of 500 mW / cm ² at 00 ° C. for 300 hours from the reflective layer side.

According to the present invention, it is possible to obtain a backlight such as a liquid crystal display device having a high reflectance, a high durability, a high brightness and a high quality image in which no bright lines are generated.

In the present invention, the underlayer (B) and the protective layer (D2)
And the thickness ratio of the layer (C) mainly composed of silver is 0.005 to 0.3.

According to the present invention, at low cost, formability,
It is possible to obtain a reflector having excellent durability.

In the present invention, the protective layer (D2) is a layer having a thickness of 1 nm or more and 20 nm or less selected from zinc oxide doped with aluminum oxide at 5 wt% or less and zinc oxide doped with gallium at 10 wt% or less. It is characterized by being.

According to the present invention, a sufficient barrier effect can be obtained, and no agglomeration occurs during the formation of the silver-based metal layer.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view showing a reflector 1 which is an embodiment of the present invention. The protective layer made of an inorganic material may be simply referred to as a protective layer in the future.

The reflector 1 of the present invention comprises a reflective layer 100 and a base material 40. The reflective layer 100 includes a protective layer 10, a metal layer 20 mainly composed of silver, and a base layer 30.

FIG. 2 is a sectional view showing a reflector 1a according to another embodiment of the present invention. The reflector 1a of the present invention is
The reflective layer 100, the base material 40, and the matte treatment layer 50 are included. The reflective layer 100 includes a protective layer 10, a metal layer 20 mainly composed of silver, and a base layer 30. Matte treatment layer 5
0 is formed on the base material surface opposite to the reflective layer 100.

FIG. 3 is a sectional view showing a lamp reflector 2 which is an embodiment of the present invention.

In the lamp reflector 2 of the present invention, for example, the base material 40 side of the reflector 1 shown in FIG. 1 and the support body 70 are bonded via the adhesive layer 60.

FIG. 4 is a perspective view of a lamp reflector 3 according to another embodiment of the present invention.

In the lamp reflector 3 of the present invention, the lamp reflector 2 as shown in FIG. 3 is molded by a method such as bending.

FIG. 5 is a sectional view perpendicular to the axis of the lamp reflector 3 shown in FIG. The lamp reflector 3 of the present invention is processed so that the reflective layer 100 including the protective layer 10, the metal layer 20 mainly containing silver, and the underlayer 30 is on the inner side facing the lamp.

FIG. 6 is a perspective view of a sidelight type backlight using a lamp reflector 3 according to another embodiment of the present invention.

The lamp reflector 3 of the present invention is a lamp 9
It is arranged on the side surface of the backlight so as to surround 0.

The present invention will be described in detail below. The base material (A) in the present invention is a metal such as aluminum, brass, stainless steel or steel, a ceramic, a polymer plate, a sheet,
In addition to the film, a pressure sensitive adhesive sheet, an adhesive sheet or the like is used.

Among these, a polymer film having a high degree of freedom in shape and capable of applying a roll-to-roll process when forming the metal layer 20, for example, is desirable.

In the reflector 1 of the present invention, preferred polymer films to be used are, for example, polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate, polycarbonates such as bisphenol A-based polycarbonate, polyethylene, polypropylene, Cyclic olefin copolymers, polyolefins such as ethylene-vinyl acetate copolymers, cellulose derivatives such as cellulose triacetate, polyvinylidene chloride,
Vinyl resins such as polyvinyl butyral, polystyrenes, polyimides, polyamides such as nylon, polyether sulfone, polysulfone resin, polyarylate resin, fluorine resin, polyether ether ketones, polyurethanes, polyacrylic acid , Polyacrylic acid esters, polymethacrylic acid, polymethacrylic acid esters, nitriles such as polyacrylonitrile and polymethacrylonitrile, polyethers such as polyethylene oxide, epoxy resins, polyvinyl alcohols, polyacetals such as Poval, etc. Examples include films made of various plastics. However, the material is not necessarily limited to these, and any material having a smooth surface with a crystallization temperature and a glass transition point higher than room temperature can be used. Among them, polyesters such as polyethylene terephthalate, polycarbonates and polyamides are preferable.

The thickness of the polymer film used is usually 1 to 250 μm, preferably 5 to 200 μm,
It is particularly preferably 10 to 200 μm, and its tensile elastic modulus and bending elastic modulus are 100 MPa or more, preferably 500.
MPa or more, more preferably 800 MPa or more, particularly preferably 1000 MPa or more.

The pressure-sensitive adhesive sheet that can be used as a substrate in the present invention is not particularly limited as long as it is stable when forming a base layer, a layer mainly containing silver, a protective layer, etc., which will be described later. Specific examples include rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, vinyl-based adhesives, and the like.
Above all, acrylic adhesives are widely used because they are inexpensive.

The adhesive sheet which can be used as the substrate in the present invention is not particularly limited as long as it is stable when forming a base layer, a layer mainly containing silver, a protective layer and the like described later, Specifically, a silicone adhesive, a polyester adhesive, an acrylic adhesive, or the like can be used. These adhesives are preferably hot-melt type.

The above-mentioned base materials may be used in combination of two or more kinds for the purpose of balancing strength, toughness and adhesion of the reflective layer described later. It may be combined before or after forming the reflective layer described later.

The substrate of the present invention may be subjected to a surface treatment for the purpose of facilitating the formation of a base layer (B) described later and enhancing the surface smoothness. Specific examples include corona discharge treatment or glow discharge treatment, and resin coating. As the coating resin, specifically, acrylic resin such as polymethylmethacrylate, polyacrylonitrile resin, polymethacrylonitrile resin, silicon resin such as a polymer obtained from ethyl silicate, fluorine resin, polyester resin, polystyrene resin , Acetate resin, polyether sulfone resin, polycarbonate resin, polyamide resin, polyimide resin, polyolefin resin, polyurethane resin, urea resin, melamine resin, epoxy resin, or a mixture thereof.

In the reflector of the present invention, the reflective layer 100 is composed of at least a base layer (B), a metal layer (C) mainly containing silver, and a protective layer (D). In this case, if the first layer on the base material side is the base layer (B) and the outermost layer is the protective layer (D), three or more layers may be used, for example (B).
(C) (D) (C) (D), (B) (C) (D) (C)
It may have a multilayer structure of three or more layers such as (B), (C) and (D). Since the production efficiency tends to decrease as the number of layers increases, it is preferably 3 to 20 layers, more preferably 3 to 15 layers.

Preferred examples of the underlayer (B) include a metal layer different from silver, a metal salt layer, or a metal oxide layer. Specifically, gold, copper, nickel, iron,
Cobalt, tungsten, molybdenum, tantalum, chromium, indium, manganese, titanium, palladium, zirconium, bismuth, tin, zinc, antimony, cerium, neodymium, lanthanum, thorium, magnesium,
Metals such as gallium or alloys of two or more kinds, oxides such as indium, titanium, zirconium, bismuth, tin, zinc, antimony, tantalum, cerium, neodymium, lanthanum, thorium, magnesium and gallium, and these oxides. Examples thereof include mixtures, zinc sulfide, and metal compounds such as magnesium fluoride. Among these, gold, copper, nickel, iron, cobalt, tungsten, molybdenum, tantalum, chromium, indium, manganese, titanium, palladium simple substance, or an alloy composed of two or more of these, zinc oxide, indium oxide, and tin oxide are preferable. More preferably, zinc oxide doped with aluminum oxide at 5 wt% or less, zinc oxide doped with gallium at 10 wt% or less, oxide of indium and tin (ITO), particularly preferably 5 wt% aluminum oxide. % Zinc oxide or zinc oxide doped with gallium at 10% by weight or less. Also, combining two or more of these,
It can also be used in multiple layers.

The metal layer (C) containing silver as a main component contains silver alone or impurities such as gold, copper, nickel, iron, cobalt, tungsten, molybdenum, tantalum, chromium, indium, neodymium, manganese, titanium and palladium. A metal containing a small amount of or a silver-based alloy is preferably used. The content of these impurities is
The amount is 0.002 to 8% by weight, preferably 0.004 to 5% by weight, and particularly preferably 0.005 to 4% by weight, though it depends on the kind of the metal.

For the protective layer (D), in addition to the same metal or oxide as the underlayer (B), two or more kinds selected from these and alloys mainly containing silver may be used in combination or in a multi-layered structure. I can.

Among these, metal oxides, preferably
Indium, titanium, zirconium, bismuth, tin,
Zinc, antimony, tantalum, cerium, neodymium,
Oxides of lanthanum, thorium, magnesium, gallium, silicon, etc., more preferably transparent oxides (D2) such as indium, titanium, zirconium, bismuth, tin, antimony, tantalum, cerium, neodymium, lanthanum,
Thorium, magnesium, aluminum, silicon, zinc,
Examples include oxides such as gallium. More preferably, it is an oxide of a metal selected from zinc, indium and tin.
Impurities may be added to these oxides at a ratio of 10% by weight or less for the purpose of imparting other properties, as long as the object of the present invention is not impaired. Further, two or more kinds can be used in combination. As a particularly preferred example, zinc oxide doped with aluminum oxide at 5 wt% or less,
Examples thereof include zinc oxide doped with 10% by weight or less of gallium, or an oxide of indium and tin (ITO).

There are a wet method and a dry method as a method of forming the above-mentioned base layer (B), the metal layer (C) mainly containing silver and the metal thin film layer which is the protective layer (D). The wet method is a general term for a plating method and is a method for forming a film by precipitating a metal from a solution. Specific examples include silver mirror reaction. On the other hand, the dry method is a general term for vacuum film forming methods, and specific examples thereof include a resistance heating vacuum evaporation method, an electron beam heating vacuum evaporation method, an ion plating method, and an ion beam assisted vacuum evaporation method. , Sputtering method, etc. In particular, a vacuum film forming method capable of a roll-to-roll method of continuously forming a film is preferably used in the present invention.

When the reflective layer of the reflector of the present invention is manufactured by the vacuum vapor deposition method, an apparatus in which three sputtering apparatuses are connected is preferably used, but when the underlayer and the protective layer are formed of the same compound. By reversing the rotation of the roll on the way, a desired reflector can be obtained even in a device in which two sputtering devices are connected.

In the vacuum vapor deposition method, the metal raw material is melted by electron beam, resistance heating, induction heating or the like to raise the vapor pressure, preferably 13.3 mPa (0.1 mTo).
rr) or less to evaporate on the substrate surface. At this time, a gas such as argon may be introduced at 13.3 mPa or more to cause high frequency or direct current glow discharge. At this time, the initial atmospheric pressure is preferably low, and specifically 20 mPa or less, more preferably 7 mPa to 0.1 mPa.

As the sputtering method, a DC magnetron sputtering method, an RF magnetron sputtering method, an ion beam sputtering method, an ECR sputtering method, a conventional RF sputtering method, a conventional DC sputtering method or the like is used.

In the sputtering method, a plate-shaped target made of a metal may be used as a raw material, and helium, neon, argon, krypton, xenon or the like is used as a sputtering gas, and argon is preferably used. The gas purity is preferably 99% or more, more preferably 9%.
It is 9.5% or more. A vacuum film forming method is preferably used for forming the transparent oxide film. A sputtering method is mainly used, and helium, neon, argon, krypton, xenon, or the like is used as a sputtering gas, and oxygen gas may be used depending on conditions.

The thickness of the thin film formed on the substrate is the same as that of the reflector 1.
In consideration of the light transmittance of less than 1% when the above is constructed.

When the metal layer is used, the thickness of the underlayer (B) is preferably 5 nm or more and 50 nm or less, more preferably 5 nm or more and 30 nm or less. The thickness of the layer is 5 nm
If it is thinner than the above range, the desired barrier effect may not be obtained, and aggregation may occur in the metal layer (C) mainly containing silver. Further, even if the thickness is more than 50 nm, there is no change in the effect. When a metal salt or metal oxide is used, the thickness of the metal salt or metal oxide layer is 1 nm or more and 20 nm or more.
The following is preferable, and 5 nm or more and 10 n is more preferable.
m or less. When the thickness of the metal salt layer or the metal oxide layer is less than 1 nm, a desired barrier effect cannot be obtained, and aggregation occurs in the metal layer (C) mainly containing silver.
Further, even if the thickness is thicker than 20 nm, there is no change in the effect.

The thickness of the metal layer (C) mainly composed of silver is 7
It is preferably 0 nm or more and 400 nm or less, more preferably 100 nm or more and 300 nm or less, further preferably 13
It is 0 nm or more and 250 nm or less. When the thickness of the metal layer (C) mainly composed of silver is less than 70 nm, the metal layer is not sufficiently formed, so that the desired reflectance may not be obtained. Further, even if the thickness is thicker than 400 nm, the effect does not change.

When the metal layer is used, the thickness of the protective layer (D) is preferably 5 nm or more and 50 nm or less, more preferably 5 nm or more and 30 nm or less. The thickness of the layer is 5 nm
If it is thinner than the above range, the desired barrier effect may not be obtained, and aggregation may occur in the metal layer (C) mainly containing silver. Further, even if the thickness is more than 50 nm, there is no change in the effect. When a transparent oxide is used, the thickness of the layer is
It is preferably 1 nm or more and 20 nm or less, and more preferably 5 nm or more and 10 nm or less. When the thickness of the transparent oxide layer is less than 1 nm, the desired barrier effect cannot be obtained, and aggregation occurs in the metal layer (C) mainly containing silver. Further, even if the thickness is thicker than 20 nm, there is no change in the effect.

In the lamp reflector of the present invention, the ratio of the sum of the thicknesses of the underlayer (B) and the protective layer (D) to the thickness of the metal layer (C) mainly containing silver is 0.005 to 0.3, Preferably 0.01 to 0.25, more preferably 0.01 to 0.
2, particularly preferably 0.02 to 0.2.

If the base layer and the protective layer are too thick as compared with the layer mainly composed of silver, not only the manufacturing cost becomes high, but also the durability is deteriorated due to the damage of the reflective layer due to the internal stress, peeling, and the change of the reflected color. However, problems such as a decrease in bending workability described below may occur.

As a method for measuring the film thickness of each layer, there is a method using a stylus roughness meter, a repetitive reflection interferometer, a microbalance, a crystal oscillator method, or the like. Since the film thickness can be measured, it is suitable for obtaining a desired film thickness. Further, there is also a method in which the conditions for film formation are determined in advance, the film is formed on the sample substrate, the relationship between the film formation time and the film thickness is investigated, and then the film thickness is controlled by the film formation time.

The reflectance of the thus produced reflector measured from the metal reflection layer side is typically 550 n.
It is 90% or more with respect to light having a wavelength of m, more specifically 92% or more, and further preferably 94% or more.

The reflector of the present invention has high durability, for example, a temperature of 100 ° C. for 300 hours and an irradiation intensity of 500 mW / cm ²
Even after irradiating simulated sunlight from the reflective layer side,
It exhibits high resistance to photothermal deterioration with a total reflectance at 0 nm of 90% or more. Here, the pseudo-sunlight is light having a spectrum similar to that of sunlight when it is sunny outdoors. In particular,
A xenon lamp is combined with an optical filter to obtain a pseudo solar spectrum. The temperature is controlled by an apparatus in which a thermocouple installed on an aluminum plate holding a sample and a plate heater are connected to a temperature controller.

As another method of evaluating the durability of the present invention, a hydrogen sulfide exposure test can be adopted. This method is carried out by placing a reflector cut into a square having a side of 5 cm in a closed container, adding hydrogen sulfide to the same container at 30 ppm, and allowing it to stand at room temperature for 24 hours. The reflector of the present invention has no blackening after the hydrogen sulfide exposure test, has a reflectance of 90% or more, and has high hydrogen sulfide resistance.

A high temperature and high humidity test can also be employed as the durability test method of the present invention. This method has a temperature of 60 ° C and a humidity of 90.
%, And a reflector cut into a square of 5 cm on a side is placed in a constant temperature and humidity chamber of 100% and left standing for 500 hours. The reflector of the present invention has no black discoloration even after the high temperature and high humidity test and has a reflectance of 9
It shows 0% or more, and peeling does not occur at all in the cross-cut peeling test of the reflective layer.

If necessary, the above reflector may be coated with a transparent resin such as benzotriazole or acrylic resin, or other organic substance. At this time, a wet method is mainly used, and the thickness thereof is 0.1 to 100 μm, preferably 0.5.
˜50 μm.

The reflector of the present invention can be obtained by a method such as a roll-to-roll process or a single-wafer process.
It is preferable to produce by a roll-to-roll process with high productivity.

The reflector of the present invention can be obtained in a roll shape, a sheet shape or the like, but it is preferably obtained in a roll shape for the above-mentioned process reasons.

The lamp reflector of the present invention can be obtained by molding the above-mentioned reflector, but preferably,
It consists of the reflector and the support.

As the support of the present invention, a plate or sheet made of metal or polymer is used. Specific examples of metals used include aluminum, aluminum alloys, stainless steel,
Copper-zinc alloy, steel or the like. Each of these metals has advantages and can be used as follows.
Aluminum is lightweight and excellent in workability, and also has a high thermal conductivity and can effectively dissipate the heat applied to the atmosphere. Therefore, the light emitted from the lamp heats the reflector.
It can be suitably used for a CD backlight. Aluminum alloy is lightweight and has high mechanical strength. Stainless steel has moderate mechanical strength and excellent corrosion resistance. Copper-zinc alloy,
For example, brass or brass has high mechanical strength and is easy to solder, so that it is easy to attach electrical terminals. Since steel is inexpensive, it is preferably used when it is necessary to keep the cost down. Further, use of a shape memory alloy has advantages such as excellent workability.

It is also possible to use a plastic plate or sheet. Materials used include biaxially oriented polypropylene, polyethylene terephthalate (PET)), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), acrylic resin, methacrylic resin, polyether sulfone (PES), poly Homopolymers such as ether ether ketone (PEEK), polyarylittes, polyetherimides, polyimides, or
Examples thereof include copolymers. Particularly preferred is a polyethylene terephthalate film, and when the polymer film is the outermost layer, a white one is preferred in appearance. These materials are generally characterized in that they can be made lighter than metal plates. The thickness of the polymer film or sheet as the support is preferably thin from the viewpoints of cost reduction and bendability, and the handling (handling) when laminating with the reflector 1 and the shape retention From a point of view, thicker ones are preferred. The thickness of the film is preferably 5 μm or more and 500 μm or less, more preferably 10 μm or more and 200 μm or less, and further preferably 15 μm or more and 100 μm or less. Further, when the base material of the above-mentioned reflector is the same material as the above-mentioned support, the support may be unnecessary. Further, when the bending process described later is difficult, it can be solved by using a shape memory resin such as a cyclic olefin polymer.

The reflector is fixed to the support, which is a plate-shaped body, on the base material side of the reflector, preferably with an adhesive or an adhesive. An adhesive is particularly preferably used.

Specific examples of the above-mentioned pressure-sensitive adhesives include rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, vinyl-based pressure-sensitive adhesives and the like. Above all, acrylic adhesives are widely used because they are inexpensive.

The above-mentioned adhesives are adhesives that are adhered with the aid of heat or a catalyst, and specifically, silicone adhesives, polyester adhesives, epoxy adhesives, cyanoacrylate adhesives, acrylics. A general adhesive such as a system adhesive can be used. Since the epoxy adhesive has excellent strength and heat resistance, it can also be suitably used. The cyanoacrylate adhesive has excellent immediate effect and strength, and thus can be used for efficient production of a reflector. These adhesives are roughly classified into a thermosetting type, a hot-melt type, and a two-liquid mixed type according to the bonding method, but a thermosetting type or a hot-melt type capable of continuous production is preferably used. Whatever adhesive you use, its thickness is
0.5 μm to 50 μm is preferable.

The above-mentioned base material and support are bonded together by a roll-to-roll or roll-to-sheet process using a laminator to obtain a roll-shaped or sheet-shaped product. For example, in the case of using an adhesive, the steps of coating the adhesive on the base material side of the reflector, drying, and laminating with a plate-shaped molded product with a roller are performed.

There are many adhesive coating methods depending on the type of substrate and adhesive agent, but the widely used ones are the gravure coater method and the reverse coater method. In the gravure coater method, a gravure roll partially immersed in an adhesive is rotated, and a film fed by a backup roll is brought into contact with the gravure roll to which the adhesive is attached to coat the film. The coating amount can be adjusted by controlling the rotation speed of the roll and the viscosity of the adhesive. The reverse coater method is also a method similar to the gravure coater method,
The amount of adhesive that adheres to the coating roll is adjusted by a metering roll installed in contact with it.

It is also possible to heat at the time of laminating. Also, heat treatment can be performed to obtain the required adhesive strength. The temperature at the time of pasting is 0 to 2
00 ° C, preferably 10 to 150 ° C, more preferably 2
0 to 120 ° C., the heat treatment temperature is 30 to 250 ° C.,
It is preferably 50 to 200 ° C. The roll wrap angle is preferably 10 to 180 degrees.

The adhesive strength between the base material and the support is 90
The peel strength is preferably 100 g / cm or more. If the adhesive strength is not reached, deformation may occur due to peeling of the reflector from the plate-shaped molded article during processing, which is not preferable.

A solvent is often used for the above-mentioned pressure-sensitive adhesive or adhesive at the time of production. If this solvent remains even after bonding, peeling may easily occur over time or the reflective layer may deteriorate (reduced durability), and when used in a backlight, it may deteriorate other members. It may cause.

The amount of residual solvent varies depending on the kind, but is preferably 0.5 g / cm ² or less, more preferably 0.1 g.
/ cm ² .

In the present invention, it is preferable that the reflector has an uneven shape on the side opposite to the reflecting layer. The height of the irregularities is 0.1 μm or more, preferably 0.3 μm or more, and more preferably 0.5 to 30 μm. Forming such an uneven shape may improve not only operability but also adhesive strength.

As the method of matte treatment, a method of embossing the surface of the polymer film to form an uneven structure,
There are a sandblast method in which particles such as SiO ₂ are blown onto the surface of a polymer film together with high pressure air, a chemical method such as etching, a method in which particles are applied, and the like, and the method is selected according to the required shape.

The reflector and the lamp reflector of the present invention can be protected by a protective film, if necessary, to protect the surface of the reflective layer from scratches and foreign matter attachment until it is used as a product. The protective film usually comprises a base film and an adhesive layer. As the base film, specifically, general-purpose films such as low density polyethylene, linear low density polyethylene, polypropylene, olefin copolymers such as ethylene-vinyl acetate copolymer, polyester such as PET are used. Since the reflector and lamp reflector of the present invention are often subjected to the molding process described below with the protective film attached, it is preferable that the film has excellent strength and elongation. Specifically, low-density polyethylene is used. Linear low-density polyethylene is preferably used.

The pressure-sensitive adhesive is not particularly limited as long as it does not cause deterioration of the reflective layer, peeling, and peeling of the protective film over time, and is easily peeled when the protective film is removed. Examples of such adhesives include acrylic adhesives, acrylic adhesives, silicone adhesives and vinyl adhesives.

The structure of the reflector of the present invention and a typical method for evaluating the electrical characteristics will be described below. Silver thin film layer, adhesive layer,
The thickness of each part of the plate-shaped molded product can be directly measured by observing the cross section with a transmission electron microscope (TEM). Polymer film analysis of substrates and supports
Infrared spectroscopy (IR), X-ray fluorescence spectroscopy (XRF), Auger electron spectroscopy (AE)
S) etc. are possible. Further, an X-ray microanalyzer (EPMA) can perform elemental analysis of a finer portion than fluorescent X-ray spectroscopy. The pressure-sensitive adhesive or adhesive is peeled off from the reflector and the support to expose the adhesive, dissolved and peeled with an appropriate solvent, and then recovered to obtain its infrared spectrum (I
R) Measuring gives information about the structure.

The thickness can also be known by composition analysis by Auger electron spectroscopy (AES), secondary ion mass spectrometry (SIMS), and by taking a depth profile.

Since the lamp reflector of the present invention is excellent in reflectance, durability and moldability, it is suitable for a backlight lamp reflector used in a liquid crystal display device and can provide a beautiful image with high brightness. In the lamp reflector of the present invention, a reflector comprising the above-mentioned reflector and a support to be laminated as necessary is punched into a predetermined shape and bent into a shape as shown in FIG. It is preferable that it is formed in a shape that covers. Also,
When the above punching process is performed, the sheet may be cut into a suitable size in advance. When transportation is required for reasons such as sheet processing, punching, and bending performed in different facilities, it is preferable to stack several tens of sheets and then vacuum package and transport. At this time, it is preferable that the packaging material has good smoothness, and if an uneven material such as an air cap is used, a slight deformation may occur on the sheet surface and the performance as a lamp reflector may be deteriorated.

At the time of processing, as shown in the sectional view of FIG. 5, a base layer (B), a metal layer (C) containing silver as a main component,
The reflective layer 100 including the protective layer (D) is arranged so as to be the innermost side. If necessary, a process such as drilling may be added.

The shape after bending depends on the method of use, but a U-shape, a U-shape and the like are preferable. The bending radius at that time is 5 mm or less, preferably 4 mm or less.

As a concrete processing method, V using a press is used.
Examples of the bending include a U-shaped bend, a U-shaped bend, and a folding bend using a Dansend bender.

The reflector of the present invention is excellent in moldability, and wrinkles and rising do not occur in the reflecting layer even when the above-mentioned processing is performed. Therefore, when the lamp reflector obtained from the reflector of the present invention is incorporated into a sidelight type backlight device, a beautiful image with high brightness and no bright lines can be realized.

Examples of the light source to be used include incandescent light bulbs, light emitting diodes (LEDs), electroluminescence (EL), fluorescent lamps, metal hydride lamps and the like, and among them, fluorescent lamps are preferably used. Fluorescent lamps are roughly classified into a hot cathode type and a cold cathode type according to their electrode structure and lighting system, and the hot cathode type tends to be larger in both electrodes and inverters. The hot-cathode type has a small electrical decoration loss in the vicinity of the electrode that does not contribute to light emission and is highly efficient, and exhibits luminous efficiency several times superior to that of the cold-cathode type. Therefore, the cold cathode type is more preferably used in terms of low power consumption and durability.

A general coated conductor is used as a conductor for supplying an electric current to the fluorescent lamp. However, if the coating material contains sulfur, sulfides such as hydrogen sulfide are generated due to deterioration over time, and a reflection layer or It is preferable to use a conductor wire using a sulfur-free coating material because it may deteriorate other members.

In the lamp reflector of the present invention, since the thin film-like reflective layer is located at the outermost layer on the light source side, light is not confined in a resin such as a reflector protected by a transparent resin or the like. Therefore, bright lines are not generated even if the brightness is increased, and a beautiful image with high brightness can be realized.

Further, since the reflectance is improved, the internal temperature is lowered and the durability is improved.

Since the reflector of the present invention has a high reflectance and a beautiful image can be obtained, in addition to a liquid crystal display device, an LED backlight, a projection TV, a front light, a direct display device such as a PDA or a mobile phone. It can also be applied to the lamp reflector of. Further, since it has a high reflectance, it can also be used as a material for a light collector of a solar cell. In particular, in the case where the reflective layer of the reflector of the present invention has a conductive property, it is possible to utilize it to also have a function as an electrode of a micro spherical silicon single crystal solar cell or the like. Besides, it can be used as a curved mirror or a rearview mirror in addition to a strobe, which is required to be lightweight and shock resistant, a signal display, an automobile light, a fluorescent lamp, a flashlight and a chandelier lighting reflector which is required to have high quality.

[0099]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 Zinc oxide (purity 99.9%) doped with 2% Al ₂ O ₃ was targeted on polyethylene terephthalate (PET) by a DC magnetron sputtering method, and a purity of 9 was obtained.
Using 9.5% argon as a sputtering gas, zinc oxide doped with 2% aluminum oxide was formed to have a film thickness of 5 nm. Subsequently, without removing this sheet from the sputtering apparatus, similarly, a DC magnetron sputtering method was used to target silver with a purity of 99.9% and a purity of 99.9%.
The film thickness of silver is 20 with 9.5% argon as the sputtering gas.
It was molded to have a thickness of 0 nm. Subsequently, without taking out this sheet from the sputtering apparatus, a target was zinc oxide (purity 99.9%) doped with 2% Al ₂ O ₃ , and argon 99.5% in purity was used as a sputtering gas.
Zinc oxide doped with 2% aluminum oxide to a film thickness of 5
It was formed to have a thickness of nm. The sheet thus obtained was placed on a Hitachi autograph spectrophotometer (model U-3400) equipped with an integrating sphere of 150φ, and the total reflectance on the reflection layer side at 550 nm was measured. The reflectance was 96.3%. Then, the photothermal deterioration test of this sheet was performed. Yamashita Denso as the light source
Using a solar simulator model YSS-505H of Co., Ltd., it was performed under simulated sunlight with an irradiation intensity of 500 mW / cm ² . The reflection sheet was heated to 100 ° C. After 300 hours under these conditions, the reflectance was measured and found to be 9
It was 5.5%. In addition, the reflection sheet as the reflector is formed of a hot melt adhesive (trade name: SK Dyne 527
Using 3), a brass plate having a thickness of 2 mm was bonded by passing it through a laminator roll heated to 100 ° C. After the adhesion, the adhesion strength was 200 g / cm as measured by 180 degree peel strength.

Further, the plate-shaped reflector thus formed is molded into the shape of a lamp reflector for a backlight of a liquid crystal display device (U-shape, opening width 4 mm), and the device is activated, and then the device is started. Let The brightness of the display was as high as 2350 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. Use time is 2
The brightness at 000 hr is 2320 cd / m ² ,
No bright line was generated. When the usage time was 5000 hr, the brightness was 2300 cd / m ² , and no bright line was generated. Therefore, no significant change with time was observed. The results are summarized in Table 1.

Example 2 A reflective sheet and a lamp reflector were prepared and evaluated according to Example 1 except that one side of the PET film used was sand matted.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
6.4%, and the reflectance of the reflection sheet after the photothermal deterioration test was 95.5%.

The sheet was bonded to a brass plate using the same adhesive material as in Example 1 with the sand mat surface as the adhesive surface.
After adhesion, measured by 180 degree peel strength is 250g
Was / cm.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2360 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2340c when the usage time is 2000 hours.
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2330 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 3 For the underlayer and the protective layer, zinc oxide doped with 5% gallium was used instead of zinc oxide doped with 2% aluminum oxide, and the thickness of the underlayer and the protective layer was 7 nm. A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 1 except that the silver layer had a thickness of 140 nm.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
6.8%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.5%.

The sheet was bonded to a brass plate in the same manner as in Example 1. After the adhesion, it was 210 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2380 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2370c when the usage time is 2000 hours.
It was d / m ² , and no bright line was generated. Usage time is 5
The luminance at 000 hr is 2360 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 4 For the underlayer and the protective layer, zinc oxide doped with 5% gallium was used instead of zinc oxide doped with 2% aluminum oxide, and the thickness of the underlayer and the protective layer was 7 nm. A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 2 except that the silver layer had a thickness of 140 nm.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
The reflectance was 7.0%, and the reflectance of the reflecting sheet after the photothermal deterioration test was 96.5%.

The sheet was bonded to a brass plate in the same manner as in Example 2. After the adhesion, it was 250 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2380 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2370c when the usage time is 2000 hours.
It was d / m ² , and no bright line was generated. Usage time is 5
The luminance at 000 hr is 2360 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Comparative Example 1 A reflective sheet was produced in the same manner as in Example 1 except that the reflective layer was a silver layer only.

The reflectance of the obtained sheet was measured and found to be 97.0%. Then, the same photothermal deterioration test as in Example 1 was performed for 300 hours, and the reflectance was measured again. As a result, the reflectance was reduced to 40.2%, and a sufficient reflectance as a reflector could be obtained. lost.

Comparative Example 2 A lamp reflector was prepared and evaluated in the same manner as in Example 1 except that the reflection layer side of the reflector and the brass plate were bonded together.

The reflectance of the obtained sheet was measured and found to be 94.6%. Then, the same photothermal deterioration test as in Example 1 was performed for 300 hours, and the reflectance was measured again. As a result, the reflectance was reduced to 53.2%, and sufficient reflectance as a reflector was obtained. lost. Also, a purple discoloration of the sheet was observed. The results are shown in Table 1.

Example 5 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that a titanium thin film was formed as an underlayer.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
It was 7.2%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.8%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After the adhesion, it was 250 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2400 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness when the usage time is 2000 hours is 2390c
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2380 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 6 Example 4 except that a titanium oxide thin film was formed as an underlayer.
A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
6.8%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.6%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After adhesion, it was 240 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2380 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness when the usage time is 2000 hours is 2380c
It was d / m ² , and no bright line was generated. Usage time is 5
The luminance at 000 hr is 2350 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 7 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that a tungsten thin film was formed as an underlayer.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
It was 6.9%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.6%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After the adhesion, the peel strength measured by 180 degrees was 230 g / cm.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2390 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness when the usage time is 2000 hours is 2380c
It was d / m ² , and no bright line was generated. Usage time is 5
The luminance at 000 hr is 2360 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 8 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that a copper thin film was formed as an underlayer.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
6.8%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.7%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After adhesion, it was 240 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2400 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2370c when the usage time is 2000 hours.
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2380 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 9 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that a magnesium fluoride thin film was formed as an underlayer.

The reflectance of the reflecting sheet before the photothermal deterioration test is 9
It was 7.0%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.7%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After the adhesion, it was 250 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2390 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness when the usage time is 2000 hours is 2390c
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2370 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 10 An indium oxide / tin oxide sintered body (IT
A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that a thin film targeting O and a composition ratio of In ₂ O ₃ : SnO ₂ = 90: 10 wt%) was formed.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
It was 7.0%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.6%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After the adhesion, the peel strength measured by 180 degrees was 230 g / cm.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2390 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness when the usage time is 2000 hours is 2390c
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2370 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 11 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that the protective layer was titanium oxide.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
The reflectance of the reflective sheet after the photothermal deterioration test was 95.5%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After adhesion, it was 240 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2290 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2280c when the usage time is 2000 hours.
It was d / m ² , and no bright line was generated. Usage time is 5
The luminance at 000 hr is 2280 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 12 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that aluminum oxide was used as the protective layer.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
It was 5.6%, and the reflectance of the reflection sheet after the photothermal deterioration test was 95.2%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After adhesion, it was 240 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2310 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2300c when the usage time is 2000hr.
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2270 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 13 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that the protective layer was silicon oxide.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
The reflectance of the reflection sheet after the photothermal deterioration test was 95.0%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After the adhesion, it was 250 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2280 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2280c when the usage time is 2000 hours.
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2260 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 14 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that the protective layer was an ITO thin film.

The reflectance of the reflecting sheet before the photothermal deterioration test is 9
6.7%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.1%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After the adhesion, it was 250 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2350 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2340c when the usage time is 2000 hours.
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2330 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 15 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that a stainless steel plate was used as the support.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
6.8%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.4%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After the adhesion, the peel strength measured by 180 degrees was 260 g / cm.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2390 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness when the usage time is 2000 hours is 2380c
It was d / m ² , and no bright line was generated. Usage time is 5
The luminance at 000 hr is 2350 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 16 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 4 except that an aluminum plate was used as the support.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
It was 6.9%, and the reflectance of the reflection sheet after the photothermal deterioration test was 96.4%.

The sheet was bonded to a brass plate in the same manner as in Example 4. After adhesion, it was 240 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2390 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness when the usage time is 2000 hours is 2360c
It was d / m ² , and no bright line was generated. Usage time is 5
The luminance at 000 hr is 2340 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 17 Polycarbonate (bisphenol A was used instead of PET.
A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 1 except that the mold was used.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
The reflectance was 6.1%, and the reflectance of the reflection sheet after the photothermal deterioration test was 95.5%.

The sheet was bonded to a brass plate in the same manner as in Example 1. After the adhesion, it was 250 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2380 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness when the usage time is 2000 hours is 2360c
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2330 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 18 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 1 except that nylon was used instead of PET.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
It was 6.1%, and the reflectance of the reflection sheet after the photothermal deterioration test was 95.4%.

The sheet was bonded to a brass plate in the same manner as in Example 1. After the adhesion, it was 250 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2380 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness when the usage time is 2000 hours is 2360c
It was d / m ² , and no bright line was generated. Usage time is 5
The luminance at 000 hr is 2340 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

Example 19 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 1 except that polyvinyl alcohol was used instead of PET.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
The reflectance was 6.3%, and the reflectance of the reflecting sheet after the photothermal deterioration test was 95.7%.

The sheet was bonded to a brass plate in the same manner as in Example 1. After adhesion, it was 240 g / cm when measured by 180 degree peel strength.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2370 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2370c when the usage time is 2000 hours.
It was d / m ² , and no bright line was generated. Usage time is 5
The luminance at 000 hr is 2340 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 1.

[0178]

[Table 1]

Example 20 A reflective sheet and a lamp reflector were prepared and evaluated in the same manner as in Example 3 except that the protective layer had a thickness of 55 nm. There was some difficulty in molding the lamp reflector, but molding was possible.

The reflectance of the reflection sheet before the photothermal deterioration test is 9
The reflectance was 6.3%, and the reflectance of the reflecting sheet after the photothermal deterioration test was 96.0%.

The sheet was bonded to a brass plate in the same manner as in Example 3. After the adhesion, the peel strength measured by 180 degrees was 260 g / cm.

After the plate-shaped reflector thus formed was incorporated into a liquid crystal display device, the device was activated. The brightness of the display was as high as 2340 cd / m ^2, and no bright line was generated on the screen, and a clear image was obtained. The brightness is 2320c when the usage time is 2000 hours.
It was d / m ² , and no bright line was generated. Usage time is 5
The brightness at 000 hr is 2290 cd / m ² ,
No bright line was generated. Therefore, no significant change with time was observed. The results are shown in Table 2.

[0183]

[Table 2]

The present invention can be embodied in various other forms without departing from the spirit or the main feature thereof.
Therefore, the above-described embodiments are merely examples in all respects, and the scope of the present invention is shown in the claims and is not bound by the specification text. Furthermore, all modifications and changes belonging to the scope of the claims are within the scope of the present invention.

[0185]

By using the reflector of the present invention, it is possible to obtain a reflector which has a higher reflectance than a high-brightness aluminum plate even when it is used for a long time and under severe conditions, and in which the reflectance is not lowered. Also, by using a film having a matte treatment on the back surface, the adhesive force can be further increased and a more stable reflector can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a reflector 1 according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a reflector 1a according to another embodiment of the present invention.

FIG. 3 is a sectional view showing a lamp reflector 2 according to an embodiment of the present invention.

FIG. 4 is a perspective view of a lamp reflector 3 according to another embodiment of the present invention.

5 is a sectional view of the lamp reflector 3 shown in FIG.

FIG. 6 is a perspective view of a sidelight type backlight using a lamp reflector 3 according to another embodiment of the present invention.

[Explanation of symbols]

1,1a reflector 2,3 lamp reflector 10 Protective layer 20 metal layers 30 Underlayer 40 base material 50 Matt processing layer 60 Adhesive layer 70 Support 90 lamp 100 reflective layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Ishikawa             Mitsui Chemicals Co., Ltd. 580-32 Nagaura, Sodegaura City, Chiba Prefecture             Inside the company F-term (reference) 2H042 DA04 DA11 DA14 DA18 DA21

Claims (11)

[Claims] 1. A base layer (B) at least on the substrate (A).
A lamp reflector having a reflective layer composed of a metal layer (C) containing silver as a main component and a protective layer (D) composed of an inorganic material, the irradiation intensity being 50 at 300 ° C. for 300 hours.
A lamp reflector having a total reflectance of 90% or more at a wavelength of 550 nm after irradiation with 0 mW / cm ² of pseudo sunlight from the reflective layer side. 2. The underlayer (B) is gold, copper, nickel,
Iron, cobalt, tungsten, molybdenum, tantalum,
It is composed of a simple substance of a metal selected from chromium, indium, manganese, titanium, or palladium and / or an alloy of two or more of these, and has a thickness of 5 nm or more 5
Metal layer of 0 nm or less and / or thickness of 1 nm or more 2
The lamp reflector according to claim 1, wherein the lamp reflector is a metal salt layer or a metal oxide layer having a thickness of 0 nm or less. 3. The silver-based metal layer (C) is made of silver alone or an alloy mainly of silver, and the thickness of the layer is
The lamp reflector according to claim 1, wherein the lamp reflector has a thickness of 70 nm or more and 400 nm or less. 4. The protective layer (D) made of an inorganic material is gold,
A simple substance of a metal selected from copper, nickel, iron, cobalt, tungsten, molybdenum, tantalum, chromium, indium, manganese, titanium, or palladium, and / or
Alternatively, a metal layer having a thickness of 5 nm or more and 50 nm or less and / or a thickness of 1 which is made of an alloy of two or more of these.
The lamp reflector according to claim 1, which is a transparent oxide layer having a thickness of not less than 20 nm and not more than 20 nm. 5. The ratio of the sum of the thicknesses of the underlayer (B) and the protective layer (D) to the thickness of the layer (C) mainly containing silver is 0.005.
The lamp reflector according to claim 1, wherein the lamp reflector has a value of about 0.3. 6. The lamp reflector according to claim 1, wherein the surface of the base material (A) opposite to the reflective layer has an uneven shape. 7. The lamp reflector according to claim 1, further comprising a support made of a metal or polymer plate or sheet. 8. The lamp reflector according to claim 1, wherein a radius of curvature on the reflective layer side is 5 mm or less. 9. A base layer (B) at least on the substrate (A).
And a reflective layer consisting of a metal layer (C) containing silver as a main component and a protective layer (D2) containing a transparent oxide as a main component.
A reflector having a total reflectance of 90% or more at a wavelength of 550 nm after irradiation with pseudo sunlight having an irradiation intensity of 500 mW / cm ^{2 from} 00 ° C. for 300 hours. 10. The ratio of the sum of the thicknesses of the underlayer (B) and the protective layer (D2) to the thickness of the layer (C) mainly containing silver is 0.0.
It is 05-0.3, The reflector of Claim 9 characterized by the above-mentioned. 11. The protective layer (D2) comprises zinc oxide and gallium 10 doped with aluminum oxide in an amount of 5% by weight or less.
A thickness of 1 n selected from zinc oxide doped in an amount of 1% by weight or less
The reflector according to claim 9, which is a layer having a thickness of m or more and 20 nm or less.