JP6353651B2 - Pachinko machine windshield protective film and pachinko machine - Google Patents

Description

  The present invention relates to a pachinko machine front glass protective film and a pachinko machine.

  Conventionally, a transparent substrate formed of an acrylic resin or the like, a game board attached to the front surface side of the transparent substrate, a windshield disposed on the front surface side of the game board, and a rear surface side of the transparent substrate. There is a pachinko machine that includes a backlight unit including a light source, irradiates light from the light source, and displays a predetermined image transmitted through the windshield to a viewer (see Japanese Patent Application Laid-Open No. 2000-61047). ).

  The game board includes, for example, a liquid crystal display unit formed in a central region and a symbol display unit formed at the periphery of the liquid crystal display unit, and the liquid crystal display unit is irradiated with light from the backlight unit. In addition, there is a display configured to display a variation image according to a user's play situation and to display a predetermined image pattern on the symbol display unit by arranging a separate light source on the symbol display unit. .

  Today, as a light source for such a pachinko machine, an LED that can promote downsizing, low power consumption, long life, and the like is widespread.

JP 2000-61047 A

  By the way, when LED is used as the light source of such a pachinko machine, since blue LED is also often used, blue light having a wavelength of 380 nm to 500 nm included in the emitted light from the light source becomes strong. Such blue light is called blue light, and has a short wavelength and high energy among visible light, such as retinal damage, eye fatigue, visual acuity, and sleep disorder caused by long-term viewing. There are concerns about adverse effects.

  This invention is made | formed in view of such a situation, and the emission of blue light was suppressed by the pachinko machine windshield protective film which can suppress the emission of blue light, and this pachinko machine windshield protection film. The purpose is to provide pachinko machines.

  The pachinko machine windshield protective film according to the present invention made to solve the above problems is a pachinko machine windshield protective film attached to the back side of the windshield of the pachinko machine, and is a base layer made of synthetic resin And an adhesive layer laminated on one surface side of the base material layer, and has means for attenuating blue light.

  Since the pachinko machine front glass protective film has means for attenuating blue light (hereinafter also referred to as “blue light attenuating means”), emission of blue light can be suppressed. Moreover, since the said pachinko machine front glass protective film has the adhesion layer laminated | stacked on the one surface side of a base material layer, it can stick to the back surface of the windshield of a pachinko machine easily by this adhesion layer. In addition, since the pachinko machine front glass protective film is attached to the windshield through the adhesive layer, even if the pachinko machine windshield protective film is damaged, another pachinko machine windshield protective film is used. By easily replacing the windshield protective film, scratches on the back side of the windshield of the pachinko machine can be suitably prevented. Furthermore, since the pachinko machine front glass protective film is attached to the back side of the front glass of the pachinko machine by the adhesive layer, even if this windshield breaks, glass fragments are attached to the adhesive layer. There is a high possibility that it will be kept in the closed state. Therefore, the pachinko machine front glass protective film can suppress scattering of glass fragments.

  It is preferable to further include a hard coat layer disposed on the other surface side of the base material layer. Thereby, breakage and scratches on the rear side of the windshield can be suitably prevented.

  The pencil hardness of the other surface of the hard coat layer is preferably 2H or more. Thereby, the breakage prevention property and damage prevention property of a windshield back surface side can be improved.

  As the blue light attenuating means, a yellow phosphor that emits yellow light when excited by blue light or a light absorber that absorbs blue light may be used. Thereby, emission of blue light can be suitably suppressed.

  As the blue light attenuating means, a blue light cut material containing the yellow phosphor or the light absorber may be contained in the base material layer. Thereby, while attenuating the blue light which injected into this blue light cut material, the outstanding anti-glare property can be exhibited by diffusing the incident light from the surface side or back surface side moderately. Moreover, according to this structure, the fine uneven | corrugated shape resulting from the blue light cut material can be formed in the base material layer surface, and the surface area of a base material layer can be increased. Therefore, the contact area with other layers (such as an adhesive layer) laminated on the base material layer is increased, and the other layers can be laminated in a strong state.

  The average particle size of the blue light cut material is preferably 1 μm or more and 50 μm or less. Thereby, while being able to form a fine uneven | corrugated shape suitably in the base-material layer surface, the light ray which injected into this blue light cut material can be spread | diffused suitably.

  As the blue light attenuating means, a blue light cut material containing the yellow phosphor or the light absorber may be contained in the adhesive layer. Even with such a configuration, the anti-glare property can be exhibited by attenuating the blue light incident on the blue light cut material and appropriately diffusing the incident light from the front surface side or the back surface side. In addition, by including a blue light cut material in a relatively thin layer such as an adhesive layer, it is easy to adjust the content of the blue light cut material per unit area, and the blue light is substantially uniform over the entire surface. In addition, the light beam incident on the blue light cut material can be suitably diffused.

  As the blue light attenuating means, the hard coat layer may contain a blue light cut material containing the yellow phosphor or the light absorber. Even with such a configuration, the anti-glare property can be exhibited by attenuating the blue light incident on the blue light cut material and appropriately diffusing the incident light from the front surface side or the back surface side. In addition, by including a blue light cut material in a relatively thin layer such as a hard coat layer, it is easy to adjust the content of the blue light cut material per unit area, and blue light is almost entirely covered. While being attenuated uniformly, the light beam incident on the blue light cut material can be suitably diffused.

  The light transmittance at a wavelength of 380 nm is preferably 10% or less, the light transmittance at a wavelength of 400 nm is 50% or less, and the light transmittance at a wavelength of 490 nm is preferably 90% or less. Thereby, fatigue | exhaustion etc. of a viewer's eyes can be relieve | moderated suitably.

  In addition, a pachinko machine according to the present invention, which has been made to solve the above problems, includes a plurality of LEDs and a windshield disposed on a surface side of the plurality of LEDs, and the pachinko machine windshield protection having the above-described configuration. A film is adhered to the back surface of the windshield by the adhesive layer.

  The pachinko machine can suppress the emission of blue light because the pachinko machine windshield protective film has blue light attenuation means. In addition, the pachinko machine can easily adhere the adhesive layer of the pachinko machine windshield protective film to the windshield, and even if the pachinko machine windshield protective film is damaged. Further, by easily replacing with another pachinko machine front glass protective film, it is possible to suitably prevent the back side of the front glass of the pachinko machine from being damaged. Furthermore, the pachinko machine can suppress the glass fragments from being scattered even when the windshield is broken.

  In the present specification, the “front side” refers to the viewer side of the pachinko machine, and the “back side” refers to the opposite side of the front side. “Pencil hardness” refers to a value based on the pencil scratch value described in 8.4 of the test method specified in JIS K5400. “Average particle diameter” means the average of the particle diameters of 30 particles randomly extracted from particles observed in an electron microscope with a magnification of 1000 times. The particle diameter is the Ferret diameter (a parallel line in a certain direction). Defined by the interval when the projected image is sandwiched. “Light transmittance” is a value according to JIS K7361-1.

  As described above, the pachinko machine front glass protective film and the pachinko machine of the present invention can suppress the emission of blue light.

It is a typical sectional view showing the pachinko machine windshield protective film concerning a first embodiment of the present invention. It is typical sectional drawing which shows the pachinko machine windshield protective film which concerns on embodiment different from the pachinko machine windshield protective film of FIG. It is typical sectional drawing which shows the pachinko machine windshield protective film which concerns on embodiment different from the pachinko machine windshield protective film of FIG.1 and FIG.2. It is typical sectional drawing which shows the pachinko machine windshield protective film which concerns on embodiment different from the pachinko machine windshield protective film of FIG.1, FIG2 or FIG.3. It is a typical fragmentary sectional view showing the pachinko machine concerning one embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[First embodiment]
<Pachinko machine windshield protective film>
The pachinko machine front glass protective film 1 in FIG. 1 includes a base material layer 2 and an adhesive layer 3 laminated on one surface side of the base material layer 2. In the pachinko machine front glass protective film 1, the base material layer 2 forms the outermost surface, and the adhesive layer 3 forms the outermost surface. The pachinko machine front glass protective film 1 is formed as a two-layer structure of a base material layer 2 and an adhesive layer 3.

(Base material layer)
The base material layer 2 is disposed on the back side of the front glass of the pachinko machine. The base material layer 2 contains a blue light cut material including a yellow phosphor that emits yellow light when excited by blue light as blue light attenuating means. The base material layer 2 is formed mainly of a transparent synthetic resin that can transmit light. Here, the transparency may be colored and translucent, but is preferably colorless and transparent in order to increase the light transmittance. The synthetic resin used for the base material layer 2 is not particularly limited, and examples thereof include polyethylene terephthalate, polyethylene naphthalate, acrylic resin, polycarbonate, polystyrene, polyolefin, cellulose acetate, and weather resistant vinyl chloride. Of these, polyethylene terephthalate or polycarbonate is preferable. Polyethylene terephthalate is excellent in transparency and can increase strength. Among the polyethylene terephthalates, polyethylene terephthalate with improved bending performance is particularly preferable. Polycarbonate has high transparency, so light wear can be reduced. Moreover, since polycarbonate has heat resistance, it is difficult to cause deterioration due to heat generation of a light source or the like. The base material layer 2 preferably contains 80% by mass or more of the main component, more preferably 90% by mass or more, and still more preferably 98% by mass or more. The “main component” refers to a component having the highest content, for example, a component having a content of 50% by mass or more.

  As a minimum of average thickness of substrate layer 2, 50 micrometers is preferred, 100 micrometers is more preferred, and 150 micrometers is still more preferred. On the other hand, the upper limit of the average thickness of the base material layer 2 is preferably 500 μm, more preferably 450 μm, and still more preferably 400 μm. When the average thickness of the base material layer 2 is less than the above lower limit, characteristics such as film strength and anti-bending property may be deteriorated. On the contrary, when the average thickness of the base material layer 2 exceeds the upper limit, the luminance of the pachinko machine when the pachinko machine windshield protective film 1 is disposed on the back surface of the windshield of the pachinko machine may be reduced. . The “average thickness” means an average value of values measured by the A-2 method of 5.1.2 defined in JIS-K-7130.

  A blue light cut material has a filler and the yellow fluorescent substance contained in this filler.

  The filler is roughly classified into an inorganic filler and an organic filler. Examples of the inorganic filler include oxides of elements selected from Groups 2 to 6 of the Periodic Table of Elements (for example, silicon, aluminum, zinc, titanium, zirconium, etc.), aluminum hydroxide, barium sulfide, magnesium silicate, or the like. Can be used. As the organic filler, for example, acrylic resin, acrylonitrile resin, polyurethane, polyvinyl chloride, polystyrene, polyacrylonitrile, polyamide and the like can be used. Among them, an acrylic resin having high transparency when cured is preferable, and polymethyl methacrylate (PMMA) is particularly preferable.

  The yellow phosphor emits yellow light when excited by blue light. The yellow phosphor emits yellow light by converting the wavelength of blue light (380 nm to 500 nm) to the long wavelength side (550 nm to 610 nm). The base material layer 2 transmits a part of incident light as it is (as blue light), and also converts a part of the light into yellow light through the wavelength conversion action of the yellow phosphor. Examples of yellow phosphors contained in the base material layer 2 include YAG phosphors (yttrium / aluminum / garnet phosphors). In addition, in such YAG phosphors, those obtained by substituting part or all of yttrium with La or Lu may be used, and those obtained by substituting part or all of aluminum with In or Sc may be used. .

  The shape of the blue light-cut material is not particularly limited, and examples thereof include a spherical shape, a spindle shape, a needle shape, a rod shape, a cubic shape, a plate shape, a scale shape, and a fiber shape. Resin beads having excellent properties are preferred.

  The lower limit of the average particle size of the blue light cut material is preferably 1 μm, more preferably 2 μm, and even more preferably 5 μm. The upper limit of the average particle size of the blue light cut material is preferably 50 μm, more preferably 20 μm, and even more preferably 15 μm. When the average particle diameter of the blue light cut material is less than the lower limit, the irregularities formed on the surface of the base material layer 2 by the blue light cut material are reduced, and the adhesiveness with the adhesive layer 3 is effectively improved. It may not be possible. Conversely, when the average particle diameter of the blue light cut material exceeds the upper limit, uniform light diffusion may be difficult.

  As a minimum of content of yellow fluorescent substance in substrate layer 2, 0.001 mass% is preferred, 0.005 mass% is more preferred, 0.01 mass% is still more preferred, and 0.05 mass% is especially preferred. preferable. On the other hand, the upper limit of the content of the yellow phosphor in the base material layer 2 is preferably 0.5% by mass, more preferably 0.4% by mass, further preferably 0.2% by mass, and 0.1% by mass. Is particularly preferred. When the content of the yellow phosphor in the base material layer 2 is less than the above lower limit, the blue light attenuation effect may not be sufficiently obtained. On the contrary, when the content of the yellow phosphor in the base material layer 2 exceeds the above upper limit, yellow light becomes strong, color unevenness is likely to occur, and chromaticity adjustment may be difficult.

The lower limit of the content per unit area of the blue light cut material in the base layer 2 (solid basis), preferably from 0.001 g / ^{m 2,} more preferably 0.005 g / ^{m 2.} The upper limit of the content per unit area of the blue light cut material in the base layer 2 (solid basis) is preferably from 0.05 g / ^{m 2,} more preferably 0.015 g / ^{m 2.} When the content per unit area of the blue light-cut material in the base material layer 2 (in terms of solid content) is less than the lower limit, blue light may not be attenuated substantially uniformly over the entire surface, and light diffusion May decrease. On the other hand, when the content per unit area of the blue light cut material in the base material layer 2 (in terms of solid content) exceeds the above upper limit, the visibility may be reduced due to a decrease in luminance. In addition, content per unit area of the blue light cut material in the base material layer 2 is a value calculated from the average thickness of the base material layer 2 and the existing amount (% by mass) of the blue light cut material contained in the base material layer 2. Say.

  The upper limit of the in-plane retardation value (Re) of the base material layer 2 is preferably 30 nm, more preferably 20 nm, and even more preferably 10 nm. Moreover, as an upper limit of the thickness direction retardation value (Rth) of the base material layer 2, 250 nm is preferable, 200 nm is more preferable, and 150 nm is further more preferable. When the in-plane retardation value (Re) and the thickness direction retardation value (Rth) of the base material layer 2 exceed the upper limit, the visibility of the image may be lowered. The lower limits of the in-plane retardation value (Re) and the thickness direction retardation value (Rth) of the base material layer 2 can be zero. The “in-plane retardation value (Re)” is obtained by multiplying the difference between the refractive index nx in the in-plane slow axis direction and the refractive index ny in the direction perpendicular to the in-plane slow axis by the average thickness d of the film. Value (Re = (nx−ny) × d). Further, the “thickness direction retardation value (Rth)” is represented by Rth = ((nx + ny) / 2−nz) × d), where nx is the refractive index in the in-plane slow axis direction; ny is the in-plane slow phase. Refractive index in the direction perpendicular to the axis; nz is the refractive index in the thickness direction; d is the average thickness of the film.

(Adhesive layer)
The pressure-sensitive adhesive layer 3 is laminated on one surface of the base material layer 2. The adhesive layer 3 sticks the base material layer 2 to the back surface of the front glass of the pachinko machine. The pressure-sensitive adhesive layer 3 has a tack force and is configured to be easily replaced after sticking.

  The adhesive layer 3 can be formed using an adhesive resin such as an acrylic resin, a urethane resin, a silicone resin, a styrene resin, a polyester resin, a polyether resin, or an epoxy resin. As these adhesive resins, those having various properties such as liquid, high-viscosity, and elastomer can be used. In addition to these adhesive resins, the adhesive layer 3 is mixed with thermoplastic resins such as high-pressure low-density polyethylene, elastomers such as synthetic rubber and natural rubber, adhesive assistants such as terpene resins and petroleum resins. May be formed.

  Among the above adhesive resins, acrylic resins, particularly (meth) acrylic acid ester polymers (including copolymers) are preferable.

  Examples of the acrylic monomer and methacrylic monomer used to synthesize the (meth) acrylic acid ester polymer include 2-ethylhexyl acrylate, n-octyl acrylate, n-butyl acrylate, and ethyl acrylate. In addition, these monomers are used as crosslinkable monomers such as acrylic acid, itaconic acid, hydroxyethyl acrylate, glycidyl acrylate, glycidyl methacrylate, methylol acrylamide, maleic anhydride, methyl methacrylate, methyl acrylate, acrylamide, acrylonitrile, methacrylonitrile, High aggregation monomers such as vinyl acetate, styrene, fluorine acrylate, and silicone acrylate, and functional group-containing monomers may be added as appropriate.

  As the polymerization treatment using such a monomer, a known polymerization method such as solution polymerization, emulsion polymerization, bulk polymerization, suspension polymerization or the like can be employed. In this case, an acrylate copolymer can be obtained by using a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator according to the polymerization method.

  Examples of the crosslinking agent include isocyanate crosslinking agents and epoxy crosslinking agents. Moreover, these crosslinking agents can be used individually by 1 type or in mixture of 2 or more types.

  Examples of the isocyanate crosslinking agent include isocyanates such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, and hydrogenated diphenylmethane diisocyanate. Monomers and isocyanate compounds obtained by adding these isocyanate monomers with trimethylolpropane and the like, isocyanurates, burette type compounds, and urethanes subjected to addition reaction such as known polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, etc. Examples include prepolymer type isocyanate.

  Examples of the epoxy-based cross-linking agent include ethylene glycol glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, N, N , N ′, N′-tetraglycidyl-m-xylylenediamine, N, N, N ′, N′-tetraglycidylaminophenylmethane, triglycidyl isocyanurate, m-N, N-diglycidylaminophenylglycidyl ether, N, N-diglycidyl toluidine, N, N-diglycidyl aniline and the like can be mentioned.

  A crosslinking monomer may be used in place of the crosslinking agent. As the crosslinking monomer, it is preferable to use an acrylic crosslinking monomer. Among them, polyfunctional (meth) acrylates such as bifunctional (meth) acrylate, trifunctional (meth) acrylate, and tetrafunctional (meth) acrylate, or monofunctional A mixture in which two or more of ˜tetrafunctional (meth) acrylates are mixed is preferable.

  Examples of the bifunctional (meth) acrylate include 1,3-butanediol diacrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, and diethylene glycol diacrylate. Polyethylene glycol 400 diacrylate, tripropylene glycol diacrylate, and the like.

  Examples of the trifunctional (meth) acrylate include triacrylates such as pentaerythritol triacrylate, trimethylolpropane triacrylate, trimethylolpropane PO-modified triacrylate, trimethylolpropane EO-modified triacrylate, and trimethacrylates thereof. It is done.

  Examples of the tetrafunctional (meth) acrylate include ditrimethylolpropane tetraacrylate and pentaerythritol tetraacrylate.

  When the crosslinking monomer is used, a photoinitiator or a thermal polymerization initiator can be used as various crosslinking initiators. Of these, a photoinitiator is preferable as the crosslinking initiator. As the photoinitiator, any of a cleavage type photoinitiator and a hydrogen abstraction type photoinitiator can be used, and among these, a hydrogen abstraction type photoinitiator is preferable. As the hydrogen abstraction type photoinitiator, for example, any one of benzophenone, Michler ketone, dibenzosuberone, 2-ethylanthraquinone, isobutylthioxanthone, etc., or a derivative thereof, or a mixed component composed of a combination of two or more of these is used. be able to.

  The addition amount of the photoinitiator is not particularly limited, but is generally adjusted within a range of 0.1 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the adhesive resin. preferable.

  In addition to the above components, the adhesive layer 3 may contain various additives such as antioxidants, anti-aging agents, hygroscopic agents, ultraviolet absorbers, antistatic agents, silane coupling agents, glass fibers and glass beads as appropriate. You may mix | blend.

  As a minimum of average thickness of adhesion layer 3, 10 micrometers is preferred, 15 micrometers is more preferred, and 20 micrometers is still more preferred. Moreover, as an upper limit of the average thickness of the adhesion layer 3, 40 micrometers is preferable, 35 micrometers is more preferable, and 30 micrometers is further more preferable. When the average thickness of the pressure-sensitive adhesive layer 3 is less than the above lower limit, the pressure-sensitive adhesive force may not be sufficiently obtained. On the contrary, when the average thickness of the adhesive layer 3 exceeds the upper limit, the brightness of the pachinko machine when the pachinko machine windshield protective film 1 is attached to the pachinko machine may be lowered.

  The lower limit of the adhesive strength of the adhesive layer 3 is preferably 20 N / 25 mm, more preferably 30 N / 25 mm, still more preferably 35 N / 25 mm, and particularly preferably 40 N / 25 mm. Moreover, as an upper limit of the adhesive force of the adhesion layer 3, 100 N / 25mm is preferable, 80 N / 25mm is more preferable, 60 N / 25mm is further more preferable. When the adhesive strength of the adhesive layer 3 is less than the above lower limit, the peel strength of the pachinko machine front glass protective film 1 may not be sufficiently obtained. On the contrary, when the adhesive strength of the adhesive layer 3 exceeds the upper limit, there is a possibility that it cannot be easily and reliably peeled off when the pachinko machine front glass protective film 1 is peeled off from the windshield. The adhesive strength of the adhesive layer 3 is measured at a peeling speed of 50 mm / min in accordance with the test method specified in JIS K6854-1, “Adhesive, peeling adhesion strength test method, Part 1: 90 degree peeling”. Refers to the peel adhesion strength.

(Characteristics of pachinko machine windshield protective film)
The lower limit of the total light transmittance of the pachinko machine front glass protective film 1 is preferably 80%, more preferably 85%, and still more preferably 90%. When the total light transmittance of the pachinko machine front glass protective film 1 is less than the lower limit, the visibility of the image when the pachinko machine front glass protective film 1 is attached to the rear surface of the front glass of the pachinko machine may be reduced. is there. In addition, as an upper limit of the total light transmittance of the said pachinko machine front glass protective film 1, it can be 100%.

  The upper limit of the light transmittance at a wavelength of 380 nm of the pachinko machine front glass protective film 1 is preferably 10%, more preferably 8%, and even more preferably 6%. Moreover, as an upper limit of the light transmittance in wavelength 400nm of the said pachinko machine front glass protective film 1, 50% is preferable, 47% is more preferable, and 45% is further more preferable. Furthermore, as an upper limit of the light transmittance in wavelength 490nm of the said pachinko machine windshield protective film 1, 90% is preferable, 87% is more preferable, and 85% is further more preferable. When the light transmittance of the pachinko machine front glass protective film 1 at wavelengths of 380 nm, 400 nm, and 490 nm exceeds the upper limit, there is a possibility that the eyestrain of the viewer cannot be sufficiently eased. The lower limit of the light transmittance at a wavelength of 380 nm of the pachinko machine front glass protective film 1 can be set to 2%, for example, and the lower limit of the light transmittance at a wavelength of 400 nm can be set to 30%, for example. The lower limit of the light transmittance at a wavelength of 490 nm can be set to 70%, for example. When the light transmittance at wavelengths 380 nm, 400 nm, and 490 nm of the pachinko machine front glass protective film 1 is less than the lower limit, color unevenness is likely to occur and chromaticity adjustment may be difficult.

  The upper limit of the haze value of the pachinko machine front glass protective film 1 is preferably 5%, more preferably 3%, and even more preferably 1%. When the haze value of the pachinko machine front glass protective film 1 exceeds the above upper limit, the visibility of the image may be reduced. The “haze value” is a value according to JIS K7136.

<Manufacturing method>
As a manufacturing method of the pachinko machine front glass protective film 1, a step (STEP 1) of forming a sheet body constituting the base material layer 2 and an adhesive layer 3 on one surface of the sheet body constituting the base material layer 2. And laminating (STEP 2).

  Although it does not specifically limit as a process (STEP1) which forms the sheet | seat body which comprises the base material layer 2, For example, the thermoplastic resin of the molten state with which the blue light cut material was mixed is extrusion-molded from T-die, Then, the The method of extending | stretching an extrusion molded body to a layer longitudinal direction and a layer width direction and forming a sheet | seat body is mentioned. As a known extrusion molding method using a T-die, for example, a polishing roll method and a chill roll method can be mentioned. Examples of the method for stretching the sheet include a tubular film biaxial stretching method and a flat film biaxial stretching method.

  As a step (STEP 2) of laminating the adhesive layer 3 on one surface of the sheet body constituting the base material layer 2, the adhesive solution is applied to one surface of the sheet body constituting the base material layer 2 and dried. Examples thereof include a method and a method in which a pressure-sensitive adhesive solution is previously applied to one side of a separator and dried, and then bonded to a sheet body constituting the base material layer 2.

<Advantages>
Since the pachinko machine front glass protective film 1 has blue light attenuating means, emission of blue light can be suppressed. Moreover, since the said pachinko machine windshield protective film 1 has the adhesion layer 3 which adheres the base material layer 2 to a windshield back surface, it can adhere easily to the back surface of the windshield of a pachinko machine by this adhesion layer 3. Moreover, since the pachinko machine front glass protective film 1 can enhance the scratch resistance on the back side of the front glass of the pachinko machine to a certain extent and is attached to the windshield through the adhesive layer 3, Even if the pachinko machine windshield protective film 1 is scratched or the like, it can be easily replaced with another pachinko machine windshield protective film 1 so that the back surface of the pachinko machine windshield is damaged. Can be prevented. Further, since the pachinko machine front glass protective film 1 is adhered to the back side of the front glass of the pachinko machine by the adhesive layer 3, even if this windshield is broken, the broken glass remains on the adhesive layer. There is a high possibility of being kept in the stuck state. Therefore, the pachinko machine front glass protective film 1 can suppress scattering of glass fragments.

  Since the pachinko machine front glass protective film 1 contains the blue light cut material containing the yellow phosphor in the base material layer 2 as the blue light attenuating means, the blue light incident on the blue light cut material is attenuated. In addition, excellent antiglare properties can be exhibited by appropriately diffusing incident light from the front surface side or the back surface side. Moreover, according to this structure, the fine uneven | corrugated shape resulting from the blue light cut material can be formed in the base material layer 2 surface, and the surface area of the base material layer 2 can be increased. Therefore, the contact area with other layers (such as the adhesive layer 3) laminated on the base material layer 2 is increased, and the other layers can be laminated in a firm state.

  The pachinko machine front glass protective film 1 can improve the antiglare property by suitably diffusing light rays with the blue light cut material because the blue light cut material is a resin bead.

[Second Embodiment]
<Pachinko machine windshield protective film>
The pachinko machine front glass protective film 11 of FIG. 2 includes a base material layer 12 and an adhesive layer 3 laminated on one surface of the base material layer 12. In the pachinko machine front glass protective film 11, the base material layer 12 forms the outermost surface, and the adhesive layer 3 forms the outermost surface. The pachinko machine front glass protective film 11 is formed as a two-layer structure of a base material layer 12 and an adhesive layer 3. The adhesive layer 3 is the same as the pachinko machine front glass protective film 1 in FIG. Moreover, about the total light transmittance of the pachinko machine windshield protective film 11, the light transmittance at a wavelength of 380 nm, the light transmittance at a wavelength of 400 nm, the light transmittance at a wavelength of 490 nm, and the haze value, the pachinko machine windshield protective film of FIG. Same as 1.

(Base material layer)
The base material layer 12 is disposed on the back side of the front glass of the pachinko machine. The base material layer 12 contains a blue light cut material containing a light absorbing agent that absorbs blue light as blue light attenuating means. The base material layer 12 is formed with a transparent synthetic resin capable of transmitting light as a main component. As a main component which forms the base material layer 12, it is the same as that of the base material layer 2 of the pachinko machine front windshield protective film 1 of FIG. Further, the average thickness, in-plane retardation value (Re) and thickness direction retardation value (Rth) of the base material layer 12 are the same as those of the base material layer 2 of the pachinko machine front glass protective film 1 of FIG.

  A blue light cut material has a filler and the light absorber contained in this filler. As said filler, it is the same as that of the filler contained in the base material layer 2 of the pachinko machine front glass protective film 1 of FIG.

  As the light absorber, a blue light absorber that absorbs blue light is used. Examples of such blue light absorbers include indigo dyes, quinophthalone dyes, quinone dyes, coumarin dyes, chlorophyll dyes, diphenylmethane dyes, spiropyran dyes, thiazine dyes, and triphenylmethane dyes. .

  The blue light-cut material has a shape, a particle diameter, and a content per unit area of the blue light-cut material in the base material layer 12. Blue contained in the base material layer 2 of the pachinko machine front glass protective film 1 in FIG. Same as light cut material.

  As a minimum of content of the blue light absorber in base material layer 12, 0.001 mass% is preferred, 0.005 mass% is more preferred, 0.01 mass% is still more preferred, and 0.05 mass% is Particularly preferred. On the other hand, the upper limit of the content of the blue light absorber in the base material layer 12 is preferably 0.5% by mass, more preferably 0.4% by mass, still more preferably 0.2% by mass, and 0.1% by mass. % Is particularly preferred. When content of the blue light absorber in the base material layer 12 is less than the said minimum, there exists a possibility that the attenuation effect of blue light may not fully be acquired. On the other hand, when the content of the blue light absorber in the base material layer 12 exceeds the above upper limit, color unevenness is likely to occur, and adjustment of chromaticity may be difficult.

<Manufacturing method>
As the manufacturing method of the pachinko machine front glass protective film 11, the step of forming a sheet body constituting the base material layer 12 (STEP 11), and the adhesive layer 3 on one surface of the sheet body constituting the base material layer 12. And laminating (STEP 12). The step (STEP 11) of forming the sheet body constituting the base material layer 12 is performed in the same procedure as STEP 1. Moreover, the process (STEP12) of laminating the adhesion layer 3 on one surface of the sheet body constituting the base material layer 12 is performed in the same procedure as STEP2.

<Advantages>
Since the pachinko machine front glass protective film 11 has blue light attenuation means, emission of blue light can be suppressed. Moreover, since the said pachinko machine front glass protective film 11 has the adhesion layer 3 which adheres the base material layer 12 to a windshield back surface, it can be easily affixed by the adhesive layer 3 on the back surface of the windshield of a pachinko machine. Moreover, since the pachinko machine windshield protective film 11 is attached to the windshield via the adhesive layer 3, even if the pachinko machine windshield protective film 11 is scratched or the like, By easily replacing the pachinko machine front glass protective film 11 with the pachinko machine, it is possible to suitably prevent scratches on the back side of the front glass of the pachinko machine. Further, since the pachinko machine front glass protective film 11 is attached to the back side of the front glass of the pachinko machine by the adhesive layer 3, even if the windshield is broken, the broken glass remains on the adhesive layer. There is a high possibility of being kept in the stuck state. Therefore, the pachinko machine front glass protective film 11 can suppress scattering of glass fragments.

  Since the pachinko machine front glass protective film 11 contains the blue light cut material containing the light absorbent in the base material layer 12 as the blue light attenuating means, the blue light incident on the blue light cut material is attenuated. In addition, excellent antiglare properties can be exhibited by appropriately diffusing incident light from the front surface side or the back surface side. Moreover, according to this structure, the fine uneven | corrugated shape resulting from the blue light cut material can be formed in the base material layer 12 surface, and the surface area of the base material layer 12 can be increased. Therefore, the contact area with other layers (such as the adhesive layer 3) laminated on the base material layer 12 is increased, and the other layers can be laminated in a firm state.

[Third embodiment]
<Pachinko machine windshield protective film>
3 includes a base material layer 22, an adhesive layer 23 laminated on one surface of the base material layer 22, and a hard coat layer laminated on the other surface of the base material layer 22. 24. In the pachinko machine front glass protective film 21, the hard coat layer 24 forms the outermost surface and the adhesive layer 23 forms the outermost surface. The pachinko machine front glass protective film 21 is formed as a three-layer structure including a base material layer 22, an adhesive layer 23, and a hard coat layer 24. About the total light transmittance of the pachinko machine windshield protective film 21, the light transmittance at a wavelength of 380 nm, the light transmittance at a wavelength of 400 nm, the light transmittance at a wavelength of 490 nm, and the haze value, the pachinko machine windshield protective film 1 of FIG. It is the same.

(Base material layer)
The base material layer 22 is disposed on the back side of the front glass of the pachinko machine. The base material layer 22 is formed with a transparent synthetic resin capable of transmitting light as a main component. The main component forming the base material layer 22 is the same as the main component of the base material layer 2 of the pachinko machine front glass protective film 1 of FIG. Further, the average thickness, in-plane retardation value (Re) and thickness direction retardation value (Rth) of the base material layer 22 are the same as those of the base material layer 2 of the pachinko machine front glass protective film 1 of FIG.

(Adhesive layer)
The adhesive layer 23 adheres the base material layer 22 to the front glass back surface of the pachinko machine. The pressure-sensitive adhesive layer 23 has a tack force and is configured to be easily replaced after sticking. The adhesive layer 23 includes a blue light cut material as a blue attenuation means. The blue light cut material is contained in the base material layer 12 of the pachinko machine front glass protective film 11 in FIG. 2 and the blue light cut material contained in the base material layer 2 of the pachinko machine windshield protective film 1 in FIG. Blue light cut material. Moreover, as a forming material of the adhesion layer 23, it is the same as that of the adhesion layer 3 of the pachinko machine windshield protective film 1 of FIG.

  The average thickness of the adhesive layer 23 is the same as the average thickness of the adhesive layer 3 of the pachinko machine front glass protective film 1 shown in FIG. When the average thickness of the pressure-sensitive adhesive layer 23 is within the above range, sufficient adhesive strength can be obtained, and the adjustment of the content of the blue light cut material per unit area can be easily performed, and the blue light can be substantially uniformly distributed over the entire surface. While attenuating, the light incident on the blue light cut material can be suitably diffused. Further, the adhesive strength of the adhesive layer 23 is the same as the adhesive strength of the adhesive layer 3 of the pachinko machine front windshield protective film 1 of FIG.

  When the yellow phosphor is contained in the adhesive layer 23, the content of the yellow phosphor in the adhesive layer 23 is the yellow phosphor contained in the base material layer 2 of the pachinko machine front glass protective film 1 in FIG. It is the same as the content. Moreover, when a blue light absorber is contained in the adhesive layer 23, the blue light absorber content in the adhesive layer 23 is included in the base material layer 12 of the pachinko machine front glass protective film 11 in FIG. 2. This is the same as the content of the blue light absorber.

  The content per unit area of the blue light cut material in the adhesive layer 23 (in terms of solid content) is the content per unit area of the blue light cut material in the base material layer 2 of the pachinko machine front glass protective film 1 of FIG. It is the same as (solid content conversion).

(Hard coat layer)
The material for forming the hard coat layer 24 is not particularly limited, and may be formed from a resin alone, and silica fine particles, a polymerization initiator, and the like may be contained therein.

  Examples of the resin forming the hard coat layer 24 include a thermosetting resin and an active energy ray curable resin.

  The hard coat layer 24 is formed by, for example, applying a coating composition containing a polymerizable monomer or polymerizable oligomer of an active energy ray curable resin on one surface of the base material layer 2 to crosslink the polymerizable monomer or polymerizable oligomer. And / or by polymerization reaction.

  The functional group of the active energy ray-curable polymerizable monomer or polymerizable oligomer is preferably an ultraviolet ray, electron beam or radiation polymerizable functional group, and an ultraviolet polymerizable functional group is particularly preferred. Examples of the ultraviolet polymerizable functional group include ethylenically unsaturated polymerizable functional groups such as (meth) acryloyl group, vinyl group, styryl group and allyl group.

  Although it does not specifically limit as said coating composition, The thing which has an acrylic monomer or a urethane acrylate oligomer as a main component is preferable. Hard coat layer 24 can raise hardness by being formed from the composition which has these monomers or oligomers as the main ingredients. In particular, the hard coat layer 24 is particularly preferably formed from a composition containing both urethane acrylate and (meth) acrylate.

  As a minimum of the total content of urethane acrylate and (meth) acrylate which forms hard coat layer 24, 45 mass% is preferred, 50 mass% is more preferred, and 60 mass% is still more preferred. The upper limit of the total content of urethane acrylate and (meth) acrylate forming the hard coat layer 24 is preferably 99% by mass, more preferably 95% by mass, and still more preferably 90% by mass. When the total content of urethane acrylate and (meth) acrylate forming the hard coat layer 24 is less than the above lower limit, flexibility, abrasion resistance, scratch resistance and the like may be lowered. On the contrary, when the total content of urethane acrylate and (meth) acrylate forming the hard coat layer 24 exceeds the above upper limit, the start of photopolymerization may be delayed and productivity may be lowered. On the other hand, when the total content of urethane acrylate and (meth) acrylate forming the hard coat layer 24 is within the above range, the productivity, the flexibility, the wear resistance, the scratch resistance, etc. are suitably improved. Can keep.

  The urethane acrylate is not particularly limited, and may be either a monomer or an oligomer. In addition, the number of functional groups of urethane acrylate is not particularly limited, and may be monofunctional or polyfunctional, but is preferably 2 or more and 6 or less, and preferably 2 or more and 3 or more. More preferably, it is as follows. The hard coat layer 24 can keep the balance between hardness and elongation ratio suitably by setting the number of functional groups of the urethane acrylate within the above range. Urethane acrylates may be used alone or in combination of two or more.

  As a minimum of elongation of urethane acrylate, 20% is preferred, 25% is more preferred, and 30% is still more preferred. Moreover, as an upper limit of the elongation rate of urethane acrylate, 80% is preferable, 75% is more preferable, and 70% is further more preferable. If the elongation percentage of the urethane acrylate is less than the above lower limit, cracking may occur during molding. Conversely, if the elongation percentage of urethane acrylate exceeds the above upper limit, the durability of the hard coat layer 24 may be reduced. On the other hand, when the elongation percentage of the urethane acrylate is within the above range, the durability can be improved and the occurrence of cracking during molding can be prevented. “Elongation” means a value measured according to JIS K5600.

  As a minimum of the glass transition temperature of resin formed from urethane acrylate, 40 ° C is preferred and 60 ° C is more preferred. Moreover, as an upper limit of the glass transition temperature of resin formed from urethane acrylate, 100 degreeC is preferable and 80 degreeC is more preferable. When the glass transition temperature of the resin formed from urethane acrylate is within the above range, the hardness and durability of the hard coat layer 24 at room temperature can be improved.

  As a minimum of content of urethane acrylate which forms hard coat layer 24, 10 mass% is preferred, 15 mass% is more preferred, and 20 mass% is still more preferred. Moreover, as an upper limit of content of the urethane acrylate which forms the hard-coat layer 24, 90 mass% is preferable, 85 mass% is more preferable, and 80 mass% is further more preferable. When the content of the urethane acrylate forming the hard coat layer 24 is less than the above lower limit, the flexibility is lowered and the risk of generating cracks is increased. Conversely, if the content of the urethane acrylate that forms the hard coat layer 24 exceeds the upper limit, the wear resistance and the coating film hardness may be reduced. On the other hand, when the content of the urethane acrylate forming the hard coat layer 24 is within the above range, appropriate flexibility is maintained and cracking is suppressed while suitably maintaining the wear resistance and the coating film hardness. can do.

  The (meth) acrylate is not particularly limited, and may be either a monomer or an oligomer. The number of functional groups of such (meth) acrylate is not particularly limited, and may be monofunctional or polyfunctional. In addition, durability can improve the hard-coat layer 24 by using (meth) acrylate more than trifunctional. The (meth) acrylate may have a molecular structure having a polar group or a low-polar molecular structure. (Meth) acrylates may be used alone or in combination of two or more.

  Examples of the polar group of (meth) acrylate include a hydroxyl group, a carboxyl group, an amino group, and an amide group.

  Examples of the (meth) acrylate containing a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 2-hydroxy-3-phenoxypropyl (meth). Acrylate, 2- (meth) acryloyloxyethyl-2-hydroxypropyl phthalate, glycerol mono (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate And (meth) acrylic acid hydroxyl group-containing esters.

  Examples of the (meth) acrylate containing a carboxyl group include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid, and 2- (meth) acryloyloxyethyl succinic acid. Examples include acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, and the like.

  Examples of (meth) acrylates containing amino groups include monomethylaminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, monomethylaminopropyl (meth) acrylate, and monoethylaminopropyl (meth) acrylate. And (meth) acrylic acid monoalkylamino esters.

  Examples of the (meth) acrylate containing an amide group include acrylamides such as (meth) acrylamide, N-methyl (meth) acrylamide, and N-methylol (meth) acrylamide.

  Examples of the (meth) acrylate having a low polar molecular structure include (meth) acrylic acid alicyclic ester or (meth) acrylic acid alkyl ester.

  Examples of such (meth) acrylic acid alicyclic esters include cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, dicyclopentadienyl (meth) acrylate, and tricyclodecanyl. (Meth) acrylate, norbornyl (meth) acrylate, etc. are mentioned.

  Examples of the (meth) acrylic acid alkyl ester include lauryl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, benzyl (meth) acrylate, stearyl (meth) acrylate, butyl (meth) acrylate, 1,6-hexanediol acrylate may be mentioned.

  As a minimum of content of (meth) acrylate which forms hard coat layer 24, 5 mass% is preferred, 10 mass% is more preferred, and 15 mass% is still more preferred. Moreover, as an upper limit of content of (meth) acrylate which forms the hard-coat layer 24, 85 mass% is preferable, 80 mass% is more preferable, and 75 mass% is further more preferable. If the content of (meth) acrylate forming the hard coat layer 24 is less than the lower limit, the wear resistance and the coating film hardness may be lowered. Conversely, if the content of (meth) acrylate forming the hard coat layer 24 exceeds the above upper limit, there is a high possibility that cracking will occur during molding. On the other hand, when the content of (meth) acrylate forming the hard coat layer 24 is within the above range, appropriate flexibility is maintained and cracks are generated while suitably maintaining the wear resistance and the coating film hardness. Can be suppressed.

  Examples of the polymerization initiator include benzophenone, benzyl, Michler's ketone, 2-chlorothioxanthone, 2,4-diethylthioxanthone, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-diethoxyacetophenone, benzyldimethyl ketal, 2,2-dimethoxy-1,2-diphenylethane-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (Methylthio) phenyl] -2-morpholinopropanone-1, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, bis (cyclopentadi Enyl) -bis (2,6- Fluoro-3- (pyr-1-yl) titanium, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2,4,6-trimethylbenzoyldiphenylphosphine oxide, etc. Note that these compounds may be used alone or in combination.

  As a minimum of pencil hardness of the other side of hard coat layer 24, 2H is preferred and 3H is more preferred. When the pencil hardness of the other surface of the hard coat layer 24 is less than the above lower limit, there is a possibility that damage and scratches on the rear surface side of the front glass of the pachinko machine cannot be prevented accurately.

  The lower limit of the average thickness of the hard coat layer 24 is preferably 1 μm, more preferably 3 μm, and even more preferably 5 μm. Moreover, as an upper limit of the average thickness of the hard-coat layer 24, 50 micrometers is preferable, 40 micrometers is more preferable, and 30 micrometers is more preferable.

<Manufacturing method>
As a manufacturing method of the pachinko machine front windshield protective film 21, the step of forming a sheet body constituting the base material layer 22 (STEP 21), and the adhesive layer 3 on one surface of the sheet body constituting the base material layer 22. A step of laminating (STEP 22), and a step of laminating the hard coat layer 24 on the other surface of the sheet body constituting the base material layer 22 (STEP 23).

  As a step (STEP 21) for forming the sheet body constituting the base material layer 22, for example, a thermoplastic resin in a molten state is extruded from a T die, and then the extruded body is stretched in the layer longitudinal direction and the layer width direction. And a method of forming a sheet body. As a known extrusion molding method using a T-die, for example, a polishing roll method and a chill roll method can be mentioned. Examples of the method for stretching the sheet include a tubular film biaxial stretching method and a flat film biaxial stretching method.

  As a step of laminating the adhesive layer 3 on one surface of the sheet body constituting the base material layer 22 (STEP 22), an adhesive in which a blue light cut material is mixed on one surface of the sheet body constituting the base material layer 22 A method in which the solution is applied and dried, a method in which a pressure-sensitive adhesive solution mixed with a blue light cut material is previously applied on one side of the separator and dried, and then bonded to the sheet body constituting the base material layer 22 Is mentioned.

  As the step of laminating the hard coat layer 24 on the other surface of the sheet body constituting the base material layer 22 (STEP 23), for example, an active energy ray curable resin is applied to the other surface of the sheet body constituting the base material layer 22 And then drying and irradiating with active energy rays. The application method of the active energy ray curable resin is not particularly limited as long as it is a method capable of uniformly applying the active energy ray curable resin to the other surface of the sheet body constituting the base material layer 22. Various methods such as a method, a spray method, a slide coating method, a dip method, a bar coating method, a roll coater method, and a screen printing method can be used. In manufacturing the hard coat layer 24, surface modification treatment such as plasma treatment in an inert gas atmosphere such as argon gas or nitrogen gas may be performed as a pretreatment as necessary.

<Advantages>
Since the pachinko machine front glass protective film 21 includes the hard coat layer 24 laminated on the other surface side of the base material layer 22, damage and scratches on the rear surface side of the front glass can be suitably prevented. .

  Since the pachinko machine windshield protective film 21 contains the blue light cut material containing the yellow phosphor or the light absorber in the adhesive layer 23 as the blue light attenuating means, the blue light incident on the blue light cut material An excellent antiglare property can be exhibited by attenuating light and appropriately diffusing incident light from the front surface side or the back surface side. In addition, by including a blue light cut material in a relatively thin layer such as the adhesive layer 23, it is easy to adjust the content of the blue light cut material per unit area, and the blue light is substantially reduced over the entire surface. While being attenuated uniformly, the light beam incident on the blue light cut material can be suitably diffused.

[Fourth embodiment]
<Pachinko machine windshield protective film>
4 includes a base material layer 22, an adhesive layer 32 laminated on one surface of the base material layer 22, and a hard coat layer laminated on the other surface of the base material layer 22. 33. In the pachinko machine front glass protective film 31, the hard coat layer 33 forms the outermost surface and the adhesive layer 32 forms the outermost surface. The pachinko machine front glass protective film 31 is formed as a three-layer structure including a base material layer 22, an adhesive layer 32, and a hard coat layer 33. The base material layer 22 is the same as the pachinko machine front glass protective film 21 in FIG. Moreover, about the total light transmittance of the pachinko machine windshield protective film 11, the light transmittance at a wavelength of 380 nm, the light transmittance at a wavelength of 400 nm, the light transmittance at a wavelength of 490 nm, and the haze value, the pachinko machine windshield protective film of FIG. Same as 1.

(Adhesive layer)
The adhesive layer 32 adheres the base material layer 22 to the front glass back surface of the pachinko machine. The pressure-sensitive adhesive layer 32 has a tack force and is configured to be easily replaced after sticking. The forming material of the adhesive layer 32 is the same as the forming material of the adhesive layer 3 of the pachinko machine front glass protective film 1 of FIG. Moreover, as average thickness of the adhesion layer 32, it is the same as that of the adhesion layer 3 of the pachinko machine front windshield protective film 1 of FIG. Further, the adhesive strength of the adhesive layer 32 is the same as the adhesive strength of the adhesive layer 3 of the pachinko machine front glass protective film 1 of FIG.

(Hard coat layer)
The hard coat layer 33 includes a blue light cut material as a blue light attenuating means. The material for forming the hard coat layer 33 is the same as the material for forming the hard coat layer 24 of the pachinko machine front glass protective film 21 in FIG. The blue light cut material is contained in the base material layer 12 of the pachinko machine front glass protective film 11 in FIG. 2 and the blue light cut material contained in the base material layer 2 of the pachinko machine windshield protective film 1 in FIG. Blue light cut material. The pencil hardness on the back surface of the hard coat layer 24 is the same as the pencil hardness on the back surface of the hard coat layer 24 of the pachinko machine front glass protective film 21 shown in FIG.

  The average thickness of the hard coat layer 33 is the same as the average thickness of the hard coat layer 24 of the pachinko machine front glass protective film 21 of FIG. When the average thickness of the hard coat layer 24 is within the above range, it is easy to adjust the content of the blue light cut material per unit area, and the blue light is attenuated substantially uniformly over the entire surface. The light incident on the material can be suitably diffused.

  When the yellow phosphor is contained in the hard coat layer 24, the yellow phosphor contained in the base layer 2 of the pachinko machine front glass protective film 1 in FIG. It is the same as the body content. Moreover, when a blue light absorber is contained in the hard coat layer 24, the content of the blue light absorber in the hard coat layer 24 is the base layer 12 of the pachinko machine front glass protective film 11 in FIG. 2. It is the same as content of the blue light absorber contained.

  As content (solid content conversion) of the blue light cut material in the hard-coat layer 24, content per unit area of the blue light cut material in the base material layer 2 of the pachinko machine front glass protective film 1 in FIG. This is the same as the amount (solid content conversion).

<Manufacturing method>
As a manufacturing method of the pachinko machine front glass protective film 31, a step of forming a sheet body constituting the base material layer 22 (STEP 31) and an adhesive layer 32 on one surface of the sheet body constituting the base material layer 22. A step of laminating (STEP 32) and a step of laminating the hard coat layer 33 on the other surface of the sheet body constituting the base material layer 22 (STEP 33).

  The step (STEP 31) of forming the sheet body constituting the base material layer 22 is performed in the same procedure as STEP 21. The step of laminating the adhesive layer 32 on one surface of the sheet body constituting the base material layer 22 (STEP 32) is performed in the same procedure as in STEP2.

  As the step of laminating the hard coat layer 33 on the other surface of the sheet body constituting the base material layer 22 (STEP 33), for example, active energy ray curing in which a blue light cut material is mixed on the other surface of the base material layer 22 The method of apply | coating resin, making it dry and irradiating an active energy ray is mentioned. The application method of the active energy ray curable resin is the same as STEP23.

<Advantages>
Since the pachinko machine front glass protective film 31 contains the blue light cut material containing the yellow phosphor or the light absorber in the hard coat layer 33 as the blue light attenuating means, it is incident on the blue light cut material. It is possible to exhibit excellent antiglare properties by attenuating blue light and appropriately diffusing incident light from the front surface side or the back surface side. Further, by including a blue light cut material in a relatively thin layer such as the hard coat layer 33, it is easy to adjust the content of the blue light cut material per unit area, and blue light is spread over the entire surface. While being attenuated substantially uniformly, the light incident on the blue light cut material can be suitably diffused.

[Fifth embodiment]
<Pachinko machine>
A pachinko machine 41 in FIG. 5 includes a transparent substrate 42 made of a transparent synthetic resin, a game board 43 attached to the surface side of the transparent substrate 42, a windshield 44 disposed on the surface side of the game board 43, and a transparent And a light source 45 including a plurality of LEDs disposed on the back side of the substrate 42. The pachinko machine base 41 has the pachinko machine front glass protective film 1 attached to the back side of the windshield 44 with an adhesive layer 3. In the pachinko machine 41, the windshield 44 is attached to the opening of the frame, and the frame is configured to be openable and closable with respect to the casing. Moreover, the game board 43 has a liquid crystal display part in the center area | region, and has a symbol display part in the periphery of this liquid crystal display part. The liquid crystal display unit receives a light beam from the light source 45 and displays a variation image corresponding to the play situation of the user. In addition, the symbol display unit is provided with a plurality of LEDs and displays a predetermined image pattern.

<Advantages>
The pachinko machine 41 can suppress the emission of blue light because the pachinko machine windshield protective film 1 has blue light attenuation means. Further, the pachinko machine base 41 can easily adhere the adhesive layer 3 of the pachinko machine windshield protective film 1 to the windshield 44, and the pachinko machine windshield protective film 1 is temporarily damaged. Even if it is a case, the damage | wound on the back surface side of the windshield 44 can be prevented suitably by replacing | exchanging easily to the said other pachinko machine front glass protective film 1. FIG. Further, the pachinko machine 41 can suppress scattering of glass fragments even when the windshield 44 is broken.

[Other Embodiments]
In addition, the pachinko machine windshield protective film and the pachinko machine of the present invention can be implemented in variously modified and improved modes in addition to the above mode. For example, the pachinko machine front glass protective film may not necessarily be formed as a two-layer structure of a base material layer and an adhesive layer or a three-layer structure of a base material layer, an adhesive layer and a hard coat layer, You may have another layer between a base material layer and an adhesion layer, or between a base material layer and a hard-coat layer. In the pachinko machine front glass protective film, a blue light cut material is not necessarily used as a blue light attenuating means. The pachinko machine windshield protective film suitably emits blue light as a blue light attenuating means by containing a yellow phosphor that emits yellow light when excited by blue light or a light absorber that absorbs blue light. Can be suppressed. The pachinko machine may be provided with the pachinko machine windshield protective film of FIGS.

  The pachinko machine front glass protective film may be formed as a roll body wound in a roll shape, or may be held in a state where release paper is laminated on the surface of the adhesive layer.

  The pachinko machine front glass protective film may be provided with a self-repairing coat layer on the back side of the base material layer instead of the hard coat layer. The self-repairing coat layer will be described below.

  The self-repairing coat layer is formed with a polyurethane resin as a main component. Examples of the polyurethane resin used for the self-repairing coat layer include a thermosetting polyurethane resin or a thermoplastic polyurethane resin. The self-repairing coat layer can be used alone or in combination with the above thermosetting polyurethane resin and thermoplastic polyurethane resin.

  The thermosetting polyurethane resin is a polyurethane resin obtained by using a compound having a functional group number of 3 or more as at least a part of the raw material composed of polyols and polyisocyanate. On the other hand, the thermoplastic polyurethane resin is a polyurethane resin obtained using only a compound having 2 functional groups. Among these, a thermosetting polyurethane resin is preferable as a material for forming the self-repairing coat layer from the viewpoint of chemical resistance, stain resistance, and durability.

  Examples of polyols used as a raw material for polyurethane resins include polyether polyols, polyester polyols, polycarbonate polyols, and the like. Among these, a polyester-based polyol having a good balance of durability, cost, strength, and self-repairability is preferable, and a polyester-based polyol obtained by opening a cyclic ester (particularly caprolactone) is particularly preferable. Moreover, although the number of functional groups of a polyol needs to be larger than 1 on an average, it is preferable that it is 2-3 from a viewpoint of the balance of intensity | strength, extensibility, and self-repairability. The polyols are preferably triol alone, a mixture of two or more triols, or a mixture of triol and diol. The polyols may contain a chain extender. Examples of the chain extender include short chain polyols and short chain polyamines. Among these, a short chain polyol is preferable from the viewpoint of transparency, flexibility, and reactivity, and a short chain diol is particularly preferable. Although the hydroxyl value of the said polyols is not specifically limited, As an average hydroxyl value in raw material polyol, 100-600 are preferable and 200-500 are more preferable. The average hydroxyl value is an average hydroxyl value calculated including a chain extender.

  As the polyisocyanate used as a raw material for the polyurethane resin, a non-yellowing polyisocyanate having yellowing resistance is preferable. Non-yellowing polyisocyanate is a polyisocyanate that does not have an isocyanate group directly bonded to an aromatic nucleus, and specific examples include hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, and the like.

  The raw materials for the polyurethane-based resin may be used alone or in combination. In addition, additives such as UV absorbers, antioxidants, light stabilizers, urethanization catalysts, colorants, flame retardants, antistatic agents, surfactants, silane coupling agents, etc. are added as necessary. May be.

  The average thickness of the self-repairing coat layer can be the same as the average thickness of the hard coat layer.

  The self-healing coat layer can be formed by applying the material for forming the self-healing coat layer to the other surface of the sheet body constituting the base material layer, and drying and curing.

  Gravure coating method, bar coating method, knife coating method, roll coating method, blade coating method, die coating method as a method for applying the forming material of the self-repairing coating layer to the other surface of the sheet constituting the base material layer Known methods such as

  The pachinko machine windshield protective film has the above self-healing coating layer, so that stress is applied to the self-healing coating layer when impact is applied from the back side, and high self-healing properties are exhibited by the flow of the soft resin. In addition, scratch resistance and the like can be improved.

  As described above, the pachinko machine front glass protective film and the pachinko machine of the present invention are suitably used for a pachinko machine that can suitably suppress the emission of blue light.

DESCRIPTION OF SYMBOLS 1 Pachinko machine windshield protective film 2 Base material layer 3 Adhesive layer 11 Pachinko machine windshield protective film 12 Base material layer 21 Pachinko machine windshield protective film 22 Base material layer 23 Adhesive layer 24 Hard coat layer 31 Pachinko machine windshield protective film 32 Adhesive layer 33 Hard coat layer 41 Pachinko machine 42 Transparent substrate 43 Game board 44 Windshield 45 Light source

Claims (8)

It is a pachinko machine windshield protective film to be attached to the back side of the front glass of the pachinko machine, comprising a base layer made of synthetic resin and an adhesive layer laminated on one side of the base material layer, have a means for attenuating the blue light,
The blue light attenuating means is a blue light cut material containing a yellow phosphor that emits yellow light when excited by blue light, or a blue light cut material containing a light absorber that absorbs blue light,
The blue light cut material is a resin bead,
Content per unit area of the blue light cut material is 0.001 g / ^{m 2} or more 0.05 g / ^{m 2} or less, the pachinko machine front glass protective films average particle diameter of 1μm or more 50μm or less.   The pachinko machine windshield protective film according to claim 1, further comprising a hard coat layer laminated on the other surface side of the base material layer.   The pachinko machine windshield protective film according to claim 2, wherein the pencil hardness of the other surface of the hard coat layer is 2H or more. Pachinko machine front glass protective film according to claim 1, claim 2 or claim 3 containing the blue light cut material above Kimoto material layer. Pachinko machine front glass protective film according to claim 1, claim 2 or claim 3 containing the blue light cut material above SL adhesive layer. Pachinko machine front glass protective film according to claim 2 or claim 3 containing the blue light cut material above Symbol hard coat layer. In light transmittance is 10% or less at a wavelength of 380 nm, with light transmittance of 50% or less at a wavelength of 400 nm, according to any one of claims 1 to 6 light transmittance of 90% or less at a wavelength of 490nm Pachinko machine windshield protective film. A plurality of LEDs and a windshield disposed on the surface side of the plurality of LEDs are provided,
A pachinko machine in which the pachinko machine windshield protective film according to any one of claims 1 to 7 is adhered to the back surface of the windshield by the adhesive layer.

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