WO2004103683A1 - 光学シートの製造方法及び光学シート - Google Patents
光学シートの製造方法及び光学シート Download PDFInfo
- Publication number
- WO2004103683A1 WO2004103683A1 PCT/JP2004/006964 JP2004006964W WO2004103683A1 WO 2004103683 A1 WO2004103683 A1 WO 2004103683A1 JP 2004006964 W JP2004006964 W JP 2004006964W WO 2004103683 A1 WO2004103683 A1 WO 2004103683A1
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- WO
- WIPO (PCT)
- Prior art keywords
- thermoplastic resin
- optical element
- radiation
- roll
- optical sheet
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/91—Heating, e.g. for cross linking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
- B29C48/9155—Pressure rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
- B29C59/046—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for layered or coated substantially flat surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
- G02B3/0068—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between arranged in a single integral body or plate, e.g. laminates or hybrid structures with other optical elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/2457—Parallel ribs and/or grooves
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24612—Composite web or sheet
Definitions
- the present invention relates to a method for manufacturing an optical sheet used in a projection television system and the like, and more particularly to an optical sheet capable of manufacturing a rigid optical sheet with good productivity and at low cost.
- the present invention relates to a sheet manufacturing method and an optical sheet manufactured by such a manufacturing method.
- Such an optical sheet is for realizing predetermined optical functions such as a function of refracting a peak direction of a light beam toward a normal direction side and a function of changing a brightness distribution. It is used by being incorporated into the screen part of a John System or microfilm reader.
- the projection television system is configured to project an image projected from the rear side onto a transmission screen, and to observe an enlarged projection image transmitted through the transmission screen from the near side.
- the transmitted light is uniformly diffused in order to be able to observe an image from a wide angle and as bright as possible without any discomfort.
- An optical sheet such as a light diffusion sheet or a lenticular lens sheet that refracts a transmitted light beam in the normal direction is often used in combination.
- a lenticular lens sheet as an optical sheet has a lens portion having a semicircular or semielliptical cross section on at least one surface.
- the optical sheet represented by such a lenticular lens sheet is in the form of a film, the following production method is used: (1) a transparent or translucent molten resin base softened by heating. The material is quenched using a mold roll, pressed and extruded, and the lens mold (molding mold) formed on the peripheral surface of the mold roll is transferred to the surface of the molten resin base material, and the lens portion (molding) is transferred.
- a photopolymer method has been proposed in which a lens portion is formed by transfer to a resin, and the radiation-curable resin is cured by irradiating the radiation-curable resin with ultraviolet rays or the like (see, for example, Japanese Patent Application Laid-Open No. 3-127401).
- the above-mentioned film-shaped optical sheet does not have rigidity (it cannot maintain its shape by itself and is easily deformed). , Which can not be installed in place. For this reason, it is necessary to attach such a film-shaped optical sheet together with a plate-shaped auxiliary body (a rigid sheet) having, for example, rigidity (the shape is hard to change even when a force is applied).
- a plate-shaped auxiliary body a rigid sheet having, for example, rigidity (the shape is hard to change even when a force is applied).
- a plate-shaped auxiliary body a rigid sheet having, for example, rigidity (the shape is hard to change even when a force is applied).
- the optical sheets used in the projection television system and the like have been increasing in size. The need is ever increasing.
- the optical sheet itself is inexpensive, but an auxiliary body such as a rigid sheet is required, so that there is a problem that the mountability is poor and the number of parts increases, resulting in an increase in cost.
- an optical sheet having rigidity itself (the shape is hardly changed even when a force is applied), for example, an optical sheet having rigidity by increasing the thickness (wall thickness) has been proposed. ing. Since such an optical sheet has rigidity itself, an auxiliary body such as a rigid sheet is not required, and the optical sheet can be attached to a predetermined position such as a projection television system by itself.
- an optical sheet having such rigidity has poor mass productivity and is expensive. That is, when continuously manufacturing such an optical sheet having such rigidity by extrusion molding, it is possible to form a gently shaped lens portion such as a lenticular lens. It was not possible to form a precise lens part including a sharp shape or a fine shape such as a fine mat, hairline, or diffraction grating.
- extrusion molding when a molten resin base is cooled using a pair of mold rolls, if the plate thickness is large, the resin shrinks during cooling, that is, so-called resin molding. There is a problem that reversion may occur, and as a result, the shapeability may be reduced.
- a rigid optical sheet is usually manufactured by the following manufacturing method, that is, a plate-shaped resin substrate is molded into a mold (an inverted shape of a sharp lens portion or a fine Press molding, injection molding, UV (ultraviolet) molding or casting molding, etc. using a mold having a reverse shape of a fine shape such as a mat, hairline, diffraction grating, etc., and when the mold is released from the mold
- the production method used was a single-sheet production, which resulted in poor productivity and high prices.
- the present invention has been made in view of the above points, and provides a method for manufacturing an optical sheet and an optical sheet capable of manufacturing a rigid optical sheet with good productivity and at low cost.
- the purpose is to:
- “having rigidity” refers to a state in which the shape does not easily change even when a force is applied. Specifically, for example, in the case of a thermoplastic resin base material, if the plate thickness (thickness) is small, the shape itself cannot be maintained, but if the thickness is increased, the shape can be maintained even when a force is applied. Becomes difficult to change. A state in which the shape is hardly changed even when a force is applied in this manner is referred to as “having rigidity” in this specification.
- the method for producing an optical sheet according to the present invention comprises cooling the molten thermoplastic resin base material, and bringing the thermoplastic resin base material into a glass surface temperature.
- pressing the flexible thermoplastic resin substrate coated with the radiation-curable resin against the peripheral surface of the radiation-curable resin mold roll with the radiation-curable resin interposed therebetween Forming a first optical element portion having a surface shape corresponding to the inverse shape of the molding die by transferring the molding die formed on the peripheral surface to the surface of the radiation-cured resin;
- the radiation formed on the thermoplastic resin substrate By irradiating radiation to the first optical element unit comprising a cured resin, characterized in that it comprises a step of curing the first optical principal Motobu.
- the temperature of the surface is equal to or lower than the glass transition point and the internal temperature is reduced. Since the thermoplastic resin substrate in a flexible state where the temperature of the resin is higher than the glass transition point is pressed against the peripheral surface of the radiation-curable resin mold roll with the radiation-curable resin interposed. However, even a thermoplastic resin base material having a rigid thickness at a temperature in a normal use state can be wound around a radiation curable resin mold roll and sufficiently adhered to the thermoplastic resin substrate. A precise mold can be formed on the surface of the radiation-cured resin applied to the surface of the substrate. This makes it possible to continuously manufacture rigid optical sheets including sharp-shaped optical elements such as Fresnel lenses and prisms, and to obtain such optical sheets with good productivity and at low cost. .
- the one surface of the flexible thermoplastic resin substrate on which the first optical element portion is formed is made of a thermoplastic resin. It is preferable that the method further includes a step of forming a film having a property of not easily peeling from the resin and the radiation curing resin. This makes it difficult for the first optical element portion made of the radiation-curable resin to peel off the thermoplastic resin base material.
- the surface shape of the first optical element formed by the radiation curable resin mold roll may be a Fresnel lens, a lenticular lens, a prism, It is preferable to have a shape of at least one optical element selected from the group consisting of a mat, a hairline, and a diffraction grating.
- the thermoplastic resin substrate is cooled by passing the molten thermoplastic resin substrate between a pair of cooling rolls.
- the pair of cooling rolls the other surface of the flexible thermoplastic resin substrate opposite to the one surface on which the first optical element portion is formed is formed.
- a cooling roll to be cooled is used as an extrusion die roll, and the molding die formed on the peripheral surface of the extrusion die roll is transferred to the surface of the thermoplastic resin base material to obtain an inverse shape of the molding die.
- the method further includes a step of forming a second optical element having a corresponding surface shape.
- the second optical element portion having a gentle shape such as a lenticular lens can be formed together with cooling of the molten thermoplastic resin base material, and an optical sheet having optical element portions formed on both surfaces can be easily obtained.
- the temperature of the radiation curable resin mold roll is controlled in the step of forming the first optical element, whereby the thermoplastic resin base is formed. It is preferred to control the temperature of the material. Further, the method may further include a step of adjusting the temperature of the thermoplastic resin substrate released from the radiation-curable resin mold roll.
- thermoplastic resin substrate is cooled to a temperature in a normal use state, and to appropriately control the warp and distortion of the thermoplastic resin substrate to obtain a desired temperature.
- a rigid optical sheet having warpage and distortion can be obtained with good productivity and at low cost.
- At least one of the radiation-curable resin mold roll and the extrusion mold roll can be adjusted in position along its axial direction. Is preferred. Thereby, when the lens portion of the first optical element portion is formed linearly along the longitudinal direction of the optical sheet, the position of the first optical element portion with respect to the thermoplastic resin base material is adjusted. Even when the first optical element portion and the second optical element portion are formed on both surfaces of the thermoplastic resin base material, the radiation curable resin mold roll or the extrusion mold roll may be used. The relative position of the first optical element and the second optical element can be easily adjusted by only one-axis adjustment that only adjusts the position along the axial direction.
- the molding die formed on the peripheral surface of the extrusion die roll has a cross-sectional shape that is substantially circular or elliptical. Is preferred.
- the optical sheet according to the present invention has a light-transmitting thermoplastic resin base material having rigidity at a temperature equal to or lower than a glass transition point, and a first resin film formed on one surface of the thermoplastic resin base material.
- An optical element portion, wherein the first optical element portion has a material whose surface temperature is equal to or lower than the glass transition point and whose internal temperature is equal to or higher than the glass transition point. It is characterized by being formed by being supplied to a mold roll together with a thermoplastic resin base material having a certain state.
- the first optical element formed on the thermoplastic resin substrate has a surface temperature of not higher than the glass transition point and an internal temperature of not lower than the glass transition point. Since the material forming the first optical element portion is formed by supplying the material forming the first optical element portion to the mold roll together with the flexible thermoplastic resin base material, the rigidity is maintained at a temperature in a normal use state. Even when the thermoplastic resin base material has a large thickness, it can be wound around a mold roll and adhere sufficiently, forming the first optical element portion supplied together with the thermoplastic resin base material. Precise shaping can be formed on the surface of the material to be formed. This makes it possible to continuously manufacture rigid optical sheets including sharp-shaped optical elements such as Fresnel lenses and prisms, and to obtain such optical sheets with good productivity and at low cost. Can be.
- the material forming the first optical element portion is made of a radiation curable resin. Further, it is preferable to further include a film provided on the one surface of the thermoplastic resin substrate on which the first optical element portion is formed, the film having a property of not easily peeling off from the thermoplastic resin and the radiation-curable resin. . This makes it difficult for the first optical element portion made of the radiation-curable resin to peel off from the thermoplastic resin substrate.
- the second surface formed on the other surface of the thermoplastic resin substrate opposite to the one surface on which the first optical element portion is formed is preferable to further include an optical element portion.
- the flexible thermoplastic resin base material is formed by passing the molten thermoplastic resin base material between a pair of cooling rolls and cooling the same, and the second optical element portion is formed. Is a surface of the pair of cooling rolls, the other surface of the flexible thermoplastic resin substrate opposite to the one surface on which the first optical element portion is formed.
- the roller is formed by using a cooling roll for cooling the roll as an extrusion die roll.
- the thermoplastic resin substrate is composed of a plurality of resin layers made of a thermoplastic resin. Further, it is preferable that at least one of the plurality of resin layers contains a light diffusing agent. in this way,
- the thermoplastic resin base material is composed of two or more resin layers made of a thermoplastic resin, for example, at least one of the resin layers may be a diffusion layer, an antistatic layer, a non-static antistatic layer, By forming a conductive layer, a resin layer having a different coefficient of thermal expansion and a different coefficient of water absorption, etc., it is possible to obtain various optical sheets having various functions and forms having different characteristics with good productivity and at low cost.
- the first optical element portion includes at least one optical element selected from the group consisting of a Fresnel lens, a lenticular lens, a prism, a mat, a hairline, and a diffraction grating force. It is preferred to have.
- FIG. 1 is a schematic cross-sectional view showing one example of an optical sheet manufactured by a method for manufacturing an optical sheet according to one embodiment of the present invention.
- FIG. 2 is a diagram showing an example of a manufacturing apparatus for realizing a method for manufacturing an optical sheet according to one embodiment of the present invention.
- FIG. 3 is a diagram showing another example of a manufacturing apparatus for realizing the method for manufacturing an optical sheet according to one embodiment of the present invention.
- an optical sheet 1 has a light-transmitting thermoplastic resin base material 2 having rigidity at a temperature equal to or lower than a glass transition point, and a thermoplastic resin base material. 2 and a first optical element portion 3 formed on one surface.
- the first optical element portion 3 may be made of a material forming the first optical element portion 3 such that the surface temperature is lower than the glass transition point and the internal temperature is higher than the glass transition point. It is formed by being supplied to a mold roll together with a flexible thermoplastic resin substrate 2.
- the thermoplastic resin substrate 2 is made of a thermoplastic resin having optical transparency, and is preferably composed of two or more resin layers (reference numerals 4, 5, and 5 in FIG. 1). 'With three layers (Fatty layer). Further, the thermoplastic resin base material 2 having such a configuration has such a rigidity that the optical sheet 1 can be attached to a predetermined position of a projection television system or the like without using an auxiliary body such as a rigid sheet. Having.
- the plate thickness of the thermoplastic resin substrate 2 is arbitrarily determined within a range in which the thermoplastic resin substrate 2 has rigidity. Specifically, it cannot be said unconditionally because it differs depending on the application, the thermoplastic resin used and the size of the product. For example, when the optical sheet 1 is used in a 40-70 inch projection television system. If so, the plate thickness of the thermoplastic resin base material 2 is preferably about 1 to 5 mm, particularly preferably about 13 to 13 mm.
- the thermoplastic resin which is a material for forming the thermoplastic resin base material 2 and the resin layers 4, 5, and 5 ′ contained therein, is a light-transmitting resin that can be used for the optical sheet 1.
- the resin is a radiation-transmissive thermoplastic resin that transmits radiation such as an electron beam (EB) or an ultraviolet ray (UV) that passes only with visible light.
- EB electron beam
- UV ultraviolet ray
- thermoplastic resin include an acrylic resin, a polycarbonate resin, a vinyl chloride resin, a styrene resin, an olefin resin, a cycloolefin resin, an acryl-styrene copolymer resin, and a polyester resin.
- the resin layers 4, 5, 5 ′ included in the thermoplastic resin substrate 2 can be used as layers having any functions required in the optical sheet 1, for example, by diffusion. Layers, transparent layers, antistatic layers, antistatic layers, resin layers with different coefficients of thermal expansion and water absorption, low reflection layers, antireflection layers, hard coat layers, conductive layers, coloring layers, selective light absorbing layers, It is used as a polarizing layer or the like.
- Each of these resin layers 4, 5, and 5 ' is mainly made of a thermoplastic resin, and the thermoplastic resin contains a light diffusing agent, a coloring agent, a tinting agent, an antistatic agent, etc., or is thermally expanded. It can be formed by selecting thermoplastic resins having different properties such as the elongation and water absorption elongation.
- the thermoplastic resin substrate 2 is composed of a single resin layer, or the resin layer composed of two or more resin layers (for example, the surface of the light emitting side).
- the resin layer (for example, the resin layer denoted by reference numeral 4 in FIG. 1) is preferably made of an acrylic resin having good surface scratch resistance, weather resistance, transparency, and the like.
- the acrylic resin include a resin mainly composed of methyl methacrylate.
- a homopolymer of methyl methacrylate or Any one of methinole methacrylate, methino oleate acrylate, ethyl acrylate, n-propyl atalylate, isopropyl acrylate, butyl acrylate, acrylonitrile, maleic anhydride, styrene or ⁇ -methylstyrene.
- a mixture of a homopolymer of methyl methacrylate and the above-mentioned copolymer Among them, an acrylic resin, a methacrylic resin, or a copolymer resin (MS resin) of a methacrylic resin and a styrene resin is particularly frequently used.
- thermoplastic resin substrate 2 the surface of the thermoplastic resin substrate 2 when the thermoplastic resin substrate 2 is composed of one resin layer, and the surface side when the thermoplastic resin substrate 2 is composed of two or more resin layers (for example, the light emitting side).
- the resin layer on the front surface side of the resin layer may constitute the second optical element portion 4 such as a lenticular lens.
- thermoplastic resin base material 2 when the resin layers 4, 5, and 5 'included in the thermoplastic resin base material 2 are used as a diffusion layer, for example, an acrylic resin, a methacryl resin, an MS resin, or other thermoplastic resin. It is preferable that fine particles of a light diffusing agent are contained in the liquid.
- any fine particles that can be used for an optical sheet can be used.
- Organic fine particles such as resin fine particles, acrylic-styrene copolymer resin fine particles, melamine resin fine particles, styrene resin fine particles, silicone resin fine particles, barium sulfate fine particles, glass fine particles, aluminum hydroxide fine particles, calcium carbonate fine particles, silica (
- inorganic fine particles such as silicon dioxide fine particles and titanium oxide fine particles, acrylic resin beads, glass beads, MS resin beads and the like can be mentioned. Further, one or more of these may be contained in the thermoplastic resin.
- the content of the fine particles of the light diffusing agent in the thermoplastic resin is not particularly limited.
- the difference in the refractive index between the thermoplastic resin and the light diffusing agent and the difference in the light diffusing agent is force that varies depending on the particle size. For example, if the difference in refractive index is 0.01-1.06 and the particle size is 320 am, 0.2-5 weight per 100 parts by weight of thermoplastic resin Part. If the content of the fine particles of the light diffusing agent is less than 0.2 part by weight, the effect of diffusion cannot be sufficiently obtained, which is not preferable.
- the case where the resin layers 4, 5, and 5r included in the thermoplastic resin base material 2 are used as diffusion layers has been described as an example. May be provided separately from the thermoplastic resin base material 2.
- the resin layers 4, 5, and 5 'included in the thermoplastic resin substrate 2 are used as the diffusion layer, it is preferable that at least one of the resin layers contains fine particles of the light diffusing agent. Good.
- each resin layer has a different diffusion function so that each resin layer has a different diffusion function.
- the type and amount of light diffusing agent fine particles may be included.
- the number and type of the resin layers 4, 5, and 5 'included in the thermoplastic resin base material 2 are not particularly limited, and a desired optical property can be obtained by appropriately combining resin layers having different optical characteristics.
- An optical sheet 1 having a function can be obtained.
- a combination of a diffusing agent layer / a transparent layer / a diffusing agent layer makes it possible to prevent moire and scintillation.
- the combination of the high-flowability resin layer / high-transparency layer / easy-adhesion layer facilitates the shaping of the high-flowability resin layer (formation of the lens portion of the second optical element section 4).
- the radiation-curable resin for shaping the first optical element portion 3 formed on the easy-adhesion layer can be made harder to peel off.
- a film 6 having a property that it is difficult to peel off from the thermoplastic resin and the radiation-curable resin is provided on the surface of the thermoplastic resin substrate 2 on which the first optical element portion 3 is formed.
- a film 6 include a film made of a chloride resin, an acrylic resin, a styrene resin, a polycarbonate resin, a polyester-polycarbonate alloy, and the like.
- the first optical element portion 3 is formed on one surface of the thermoplastic resin substrate 2 via a film 6 or the like.
- the first optical element 3 is made of a material forming the first optical element 3. It is formed by being supplied to a mold roll together with a flexible thermoplastic resin base material 2 whose surface temperature is equal to or lower than the glass transition point and whose internal temperature is equal to or higher than the glass transition point. .
- the first optical element 3 is preferably formed, for example, on the surface of the thermoplastic resin substrate 2 on the light incident side.
- the first optical element portion 3 may be formed on the light-emitting side surface of the thermoplastic resin base material 2 or may be formed on the light-incident side surface and the light-emitting side surface of the thermoplastic resin base material 2. Formed on both sides.
- the material forming the first optical element portion 3 is preferably made of a radiation-curable resin.
- a radiation-curable resin is a light-transmitting resin, and preferably, a reactive polymer or oligomer having a polymerizable unsaturated bond or an epoxy group in its structure is used.
- Specific examples include polyester, polyether, acrylic resin, epoxy resin, (meth) acrylate such as urethane resin, silicon resin such as siloxane, radical polymerizable monomer or polyfunctional monomer.
- radical polymerizable monomers include (meth) acrylic acid ethyl, (meth) acrylamide, aryl compounds, vinyl ethers, vinyl esters, vinyl heterocyclic compounds, N-butyl compounds, styrene, (meth) ) Acrylic acid, crotonic acid, itaconic acid and the like.
- polyfunctional monomer examples include diethylene glycol di (meth) atalylate, triethylene glycol (meth) atalylate, tetraethylene dalicol (meth) atalylate, trimethylolpropane tri (meth) atalylate, and pentaeristol tetra ( Examples thereof include (meth) atalylate, dipentaerythritol hexa (meth) atalylate, and tris ( ⁇ - (meth) atalyloxoxyl) isocyanurate.
- Such a radiation-curable resin is cured by irradiating radiation such as an electron beam ( ⁇ ) or ultraviolet light (UV).
- ⁇ electron beam
- UV ultraviolet light
- the radiation-curable resin when the radiation-curable resin is cured by, for example, ultraviolet light, for example, ultraviolet light emitted from a light source such as an ultra-high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, or a metal halide lamp may be used. it can.
- a photopolymerization initiator examples include acetophenones, benzophenones, Michler benzoyl benzoate, and ⁇ -benzoyl benzoate.
- Examples thereof include nore, aldoxime, tetramethylmeuram monosulfide, thioxanthone, and / or photosensitizers such as n-butylamine, triethylamine, and tributylphosphine.
- an electron beam irradiator for example, Cockloft Penoleton type, Pandelrough type, Resonant transformation type, Insulating core transformer type, Linear type, Electrification type
- An electron beam for example, an electron beam having an energy of 50 to 100 keV
- various electron beam irradiation apparatuses such as a curtain type, a dynamitron type, and a high frequency type
- any optical element that can be used for an optical sheet can be used.
- it is a Fresnel lens, a lenticular lens, a prism, a mat, a hairline or a diffraction grating, and more specifically, for example, a Circular Fresnel lens, a linear Fresnel lens, a total reflection Fresnel lens, a triangular prism, a polygon.
- Examples include prisms, lenticular lenses, sandblast mats, rectangular diffraction gratings, holograms, and moth eyes.
- this Fresnel lens has a triangular prism composed of an incident surface and a total reflection surface that totally reflects a part or all of the light incident from the incident surface and deflects the light in a desired direction. Are arranged on the surface.
- the first optical element portion 3 is formed on one surface (for example, the light incident side surface) of the thermoplastic resin substrate 2, the light emitting side on the other surface is formed.
- the surface may be left as it is, or a light-shielding layer may be provided to improve the contrast.
- a second optical element unit 4 such as a lenticular lens may be provided.
- the second optical element part 4 may be formed by the same method as the above-described method of forming the first optical element part 3, but preferably, the thermoplastic resin base material 2 is cooled. It is good to form when making it flexible. That is, the flexible thermoplastic resin base material 2 is formed by cooling the molten thermoplastic resin base material 2 by passing it between a pair of cooling rolls. Therefore, when the thermoplastic resin substrate 2 is cooled using the cooling rolls in this manner, the first optical member of the thermoplastic resin substrate 2 among the pair of cooling rolls is used. If a cooling roll that cools the surface opposite to the surface on which the element portion 3 is formed is used as an extrusion die roll, the lens mold (molding die) of this extrusion die roll can be made of a thermoplastic resin base. By transferring to the surface of the material 2, the second optical element portion 4 having a surface shape corresponding to the reverse shape of the lens mold can be formed.
- a lenticular lens or the like having a relatively gentle shape is used as the second optical element portion 4.
- the shape of the lenticular lens is not particularly limited.
- the pitch is 30 zm or more, preferably 60 xm or more
- the curved shape of the cross section is a semicircular arc, semielliptical arc, A curve approximated to a parabola, a hyperbola or a trigonometric function curve, a combination of those curves, or a shape in which a tangent is combined with such a curve (for example, a trapezoidal shape) is given.
- the above-mentioned curved shape of the cross section those having no singular point and capable of providing a draft taper are preferably used.
- the lenticular lens used as the second optical element part 4 diffuses light on the surface on the light exit side by the action of light refraction or reflection, or corrects the optical axis of light obliquely incident in the vertical direction. Things.
- the optical sheet 1 according to the present embodiment has the first optical element portion 3 having rigidity and a precise lens portion, the optical sheet 1 for a backlight or the like It is useful as an optical sheet such as a sheet for collecting or illuminating natural light, a hologram plate, a non-glare plate, a precision mat plate, a louver, a linear Fresnel lens sheet, and a prism sheet.
- the optical sheet 1 according to the present embodiment can be manufactured continuously, and can be manufactured endlessly if the lens shape has a linear pattern. It can be applied to large optical sheets, and has very high industrial value.
- FIG. 2 is a diagram illustrating an example of a manufacturing apparatus for realizing the method for manufacturing the optical sheet 1 according to the present embodiment.
- this manufacturing apparatus mainly includes a die 10, a pair of first roll 11 and second roll 12 as cooling rolls, and a radiation curable resin coating.
- An apparatus 13, a radiation curing resin mold roll 14, and a radiation irradiation apparatus 15 are provided.
- the T-die 10 forms the molten thermoplastic resin into a sheet having a predetermined thickness and continuously supplies the sheet between the first roll 11 and the second roll 12. .
- the T-die 10 should be formed by multi-layer extrusion molding so that the thermoplastic resin base material 2 to be finally formed can be composed of a multilayer (two or more) resin layers 5. It is preferable that it can be used.
- the first roll 11 and the second roll 12 are arranged to face each other, and the molten thermoplastic resin base material supplied from the T die 10 by the first roll 11 and the second roll 12 is provided. While pressing 2, the thermoplastic resin substrate 2 is cooled such that the temperature of the thermoplastic resin substrate 2 becomes a predetermined temperature (the surface temperature is lower than the glass transition point and the internal temperature is higher than the glass transition point).
- the surface of the thermoplastic resin substrate 2 is 2
- the optical element part 4 can be formed.
- a lens mold having a shape opposite to the shape of the desired lens portion is formed on the peripheral surface of the second roll 12 used as the extrusion die roll.
- a lens mold for forming a lenticular lens is formed on the peripheral surface of the second roll 12.
- such a lens mold has a large number of lens-shaped grooves formed along the circumferential direction of the second roll 12 and arranged along the axial direction.
- the molten thermoplastic resin substrate 2 is brought into close contact with and pressed against the peripheral surface on which such a lens mold is formed, whereby the lens mold of the second roll 12 is transferred to the surface of the thermoplastic resin substrate 2.
- the lens portion of the second optical element portion 4 is formed.
- the cross-sectional shape of the lens-shaped groove formed on the peripheral surface of the second roll 12 used as the extrusion die roll may be any shape that is not particularly limited.
- the shape may be a shape approximate to a substantially circular or elliptical shape.
- the second roll 12 used as the extrusion die roll can be moved in the axial direction and can adjust the relative position with respect to the thermoplastic resin base material 2.
- the thermoplastic resin base material 2 supplied between the first roll 11 and the second roll 12 is part of the peripheral surface of the second roll 12 (for example, approximately half a circumference).
- thermoplastic resin base 2 on the second roll 12 allows the lens mold of the second roll 12 to be transferred to the surface of the thermoplastic resin base 2 to form a lens portion. There is no particular limitation as long as it is within the range.
- the radiation curable resin mold roll 14 is for forming the first optical element portion 3 on the thermoplastic resin base material 2 released from the second roll 12 used as an extrusion mold roll.
- a lens mold shape mold
- a lens mold for forming a Fresnel lens is formed on the peripheral surface of the radiation curable resin mold roll 14. I have.
- such a lens mold has a large number of lens-shaped grooves formed along the circumferential direction of the radiation curable resin mold roll 14 along the axial direction.
- the surface of the molten thermoplastic resin substrate 2 in contact with the first roll 11 is pressed against a part of the peripheral surface on which such a lens mold is formed with the radiation-curable resin interposed therebetween.
- the lens mold of the radiation curable resin mold roll 14 is transferred to the surface of the radiation curable resin to form the lens part of the first optical element part 3.
- the lens-shaped grooves formed on the peripheral surface of the radiation curable resin mold roll 14 may be arranged obliquely or horizontally without necessarily being disposed along the axial direction. Absent. However, in order to easily release the first optical element portion 3 from the radiation curable resin mold roll 14, it is preferable that the first optical element portion 3 be disposed along the axial direction. Masurie
- the cross-sectional shape of the lens-shaped groove formed on the peripheral surface of the radiation curable resin mold roll 14 is not particularly limited and may be any shape, for example, The shape may be a triangle, a rectangle, a polygon, a circle, an ellipse, or a shape approximating those shapes. Note that these lens-shaped grooves may be partially or entirely different in pitch, Z or shape, or may be random like interference fringes of a hologram. [0059] Further, it is preferable that the radiation curable resin mold roll 14 can be moved in the axial direction and can adjust the relative position with respect to the thermoplastic resin base material 2. Thereby, the positions of the first optical element 3 and the second optical element 4 formed on the surface of the thermoplastic resin substrate 2 and the surface on the opposite side can be adjusted as required.
- the temperature of the thermoplastic resin base material 2 can be adjusted by controlling the temperature of the radiation curable resin mold roller 14. Preferably, it is Thereby, the warp and distortion of the thermoplastic resin substrate 2 are appropriately controlled, and the rigid optical sheet 1 having desired warp and distortion can be obtained with good productivity and at low cost.
- a radiation curing resin coating device for example, an application die 13 is disposed around the radiation curing resin mold roll 14.
- the application die 13 supplies a predetermined amount of radiation-curable resin that can form the first optical element portion 3.
- the application die 13 is placed on the mold roll 14 for radiation-curable resin, or on the surface of the thermoplastic resin substrate 2 where the first roll 11 contacts, or on the thermoplastic resin substrate 2.
- the radiation curable resin is supplied between the surface in contact with the first port 11 and the radiation curable resin mold roll 14.
- the radiation-curable resin supplied from the application die 13 in this manner is pressed against the peripheral surface of the radiation-curable resin mold roll 14 together with the thermoplastic resin base 2, whereby the radiation-curable resin is pressed.
- the lens mold of the mold roll 14 is transferred to the surface of the radiation-curable resin to form the lens section of the first optical element section 3.
- the radiation irradiator 15 irradiates radiation such as electron beam (EB) or ultraviolet (UV) to the radiation-curable resin filled in the lens mold of the radiation-curable resin mold roll 14. is there.
- the irradiation position of the radiation is set at a position downstream of the position where the radiation-curable resin is filled in the lens mold of the radiation-curable resin mold roll 14 and the thermoplastic resin base 2 is placed on the radiation-curable resin mold roll 14. This is a position before being released from the mold (after the lens portion is formed), and the radiation-curable resin is irradiated with radiation via the thermoplastic resin base material 2 to cure the radiation-curable resin.
- the radiation irradiation device 15 may be one that can cure a radiation-curable resin.
- a radiation-curable resin for example, in addition to an ultraviolet irradiator equipped with a light source that emits ultraviolet light such as an ultra-high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, or a metal halide lamp, a Cockloft-Walton type, a Pandelrough type, Electron beam irradiation devices such as a resonance transformer type, an insulating core transformer type, a linear type, an elector curtain type, a dynamitron type, and a high frequency type are exemplified.
- a temperature adjusting device (not shown) for adjusting the temperature of the thermoplastic resin base material 2 released from the radiation curing resin mold port 14 is provided downstream of the radiation curing resin mold roll 14. Zu) may be provided.
- the temperature adjusting device any device can be used as long as the temperature of the thermoplastic resin substrate 2 can be adjusted (for example, cooled to a predetermined temperature) from both sides thereof.
- the temperature control device for example, a cooling roll, a cooling fan, a heat retaining gauge, etc., the temperature of the front and back surfaces is adjusted so as to obtain a desired distortion while the entire thermoplastic resin substrate 2 is at or below the glass transition point. It is preferable to use a device for cooling such that Accordingly, the warp and distortion of the thermoplastic resin substrate 2 can be appropriately controlled, and the rigid optical sheet 1 having the desired warp and distortion can be obtained with good productivity and at low cost.
- thermoplastic resin is extruded through a T-die 10, and a first roll 11 and a second roll 12 used as an extrusion die roll are continuously formed as a molten thermoplastic resin base material 2.
- the melting of the thermoplastic resin in the T-die 10 is carried out by using an acrylic resin, a polycarbonate resin, a vinyl chloride resin, a styrene resin, an olefin resin, a cycloolefin resin, and an acrylic styrene resin as the thermoplastic resin.
- a polymer resin, a polyester resin or the like the reaction is performed at a temperature of 200 to 280 ° C.
- thermoplastic resin base material 2 is made of an acrylic resin
- the acrylic resin is melted at a temperature of 240 to 250 ° C by the T-die 10, and then melted in this manner.
- Ataryl resin is formed into a sheet having a predetermined thickness from the T die 10 and is continuously supplied between the first roll 11 and the second roll 12.
- thermoplastic resin substrate 2 is formed of a multilayer (two or more) resin layers, multilayer extrusion molding is performed from the T die 10.
- the film 6 is continuously provided between the molten thermoplastic resin base material 2 supplied from the T-die 10 and the first roll 11. To supply.
- the thermoplastic resin base material 2 As described above, by passing the thermoplastic resin base material 2 between the first roll 11 and the second roll 12, the molten thermoplastic resin base material 2 is cooled, The plastic resin base material 2 is brought into a flexible state in which the surface temperature is lower than the glass transition point and the internal temperature is higher than the glass transition point. At this time, the temperatures of the first roll 11 and the second roll 12 may be individually set to 50-100 ° C. Specifically, for example, when the thermoplastic resin base material 2 is made of an acrylic resin, the acrylic resin melted at a temperature of 240 to 250 ° C. by the T-die 10 includes a first roll 11 at 65 ° C.
- the surface temperature is below the glass transition point of 80-90 ° C (for example, 87 ° C) and the internal temperature is above the glass transition point of 90-250 ° C. (It is unknown because the actual internal temperature cannot be measured, but since the first roll 11 and the second roll 12 as the cooling rolls do not cause distortion, it is clear that the temperature is higher than the glass transition point.)
- the Rukoto The glass transition point of the acrylic resin is 90-100 ° C, for example, 98 ° C.
- thermoplastic resin base material 2 is pressed by the first roll 11 and the second roll 12, and the thermoplastic resin base material 2 is brought into close contact with a part of the peripheral surface of the second roll 12.
- the lens mold of the second roll 12 used as the extrusion die is transferred to the surface of the thermoplastic resin base material 2 to form the lens part of the second optical element part 4.
- the first roll 11 is used as an extrusion die roll
- the second roll 12 is used as an extrusion die roll, because the molding rate can be easily increased.
- the second optical element portion 4 having a surface shape (for example, a lenticular lens having a semicircular cross section) corresponding to the reverse shape of the lens shape is formed on the surface of the thermoplastic resin substrate 2.
- thermoplastic resin substrate 2 is released from the second roll 12 used as an extrusion die roll, and the surface of the thermoplastic resin substrate 2 has a temperature equal to or lower than the glass transition point and an internal temperature. Is guided to the radiation curable resin mold roll 14 in a state of flexibility above the glass transition point. At this time, the radiation-curable resin is applied onto the radiation-curable resin mold roll 14 from the application die 13 disposed around the radiation-curable resin mold roll 14. The radiation-curable resin is applied to the surface of the thermoplastic resin substrate 2 opposite to the surface on which the second optical element portion 4 is formed.
- thermoplastic resin substrate 2 is pressed in close contact with a part of the peripheral surface of the radiation-curable resin mold roll 14 with the radiation-curable resin supplied from the application die 13 interposed therebetween.
- the lens mold of the radiation-curable resin mold roll 14 is more reliably radiation-cured.
- the lens portion of the first optical element portion 3 is formed by being transferred to the surface of the resin.
- the first optical element portion 3 having a surface shape for example, a Fresnel lens having a triangular cross section
- the radiation irradiator 15 emits radiation (eg, from the radiation irradiator 15) toward the first optical element portion 3 formed on the thermoplastic resin base material 2 before being released from the radiation curable resin mold roll 14. UV light).
- the radiation applied in this manner is applied to the first optical element unit 3 via the thermoplastic resin base material 2, and the first optical element unit 3 made of a radiation-curable resin is hardened.
- the first optical element portion 3 made of the radiation-curable resin is fixed directly to the thermoplastic resin base material 2 or via the film 6, and the first optical element portion 3 is hardly peeled off from the thermoplastic resin base material 2. Become.
- thermoplastic resin substrate 2 to which the first optical element portion 3 is fixed is released from the radiation curable resin mold roll 14, and is guided as another optical sheet 1 to another process.
- the surface temperature is equal to or lower than the glass transition point and the internal temperature. Since the thermoplastic resin base material 2 in a flexible state having a force equal to or higher than the S glass transition point is pressed against the peripheral surface of the radiation curable resin mold roll 14 with the radiation curable resin interposed therebetween. However, even if the thermoplastic resin base material 2 is rigid and has a large plate thickness at a temperature in a normal use state, it can be wound around the radiation curable resin mold roll 14 and sufficiently adhered thereto.
- the first optical element portion 3 is made of a radiation-curable resin (for example, an ultraviolet-curable resin)
- a radiation-curable resin for example, an ultraviolet-curable resin
- its surface is stabilized, and the radiation-curable resin does not remain on the radiation-curable resin mold roll 14 and The shape does not change even when it is released from the mold 14 for radiation curing resin. Therefore, the mold roll for radiation-cured resin 14
- the mold can be transferred to the surface of the radiation-curable resin applied to the surface of the thermoplastic resin substrate 2 to form a precise lens portion.
- This makes it possible to continuously manufacture a rigid optical sheet 1 including a sharp optical element such as a Fresnel lens or a prism as the first optical element section 3. It can be obtained with good productivity and at a lower cost than single-wafer manufacturing.
- the optical sheet 1 it is possible to continuously manufacture the optical sheet 1, and if the lens shape can be processed by the radiation curing resin mold port 14, the endless production is performed. Therefore, it can be applied to a large-sized optical sheet, and has a very high industrial value.
- first roll 11 and second roll 12 as cooling rolls for cooling thermoplastic resin base material 2 is used as an extrusion die roll. Therefore, the lens portions (the first optical element portion 3 and the second optical element portion 4) can be accurately and easily formed on both surfaces of the thermoplastic resin substrate 2. That is, in the conventional method, for example, when forming lens portions by pressing on both surfaces of a flat thermoplastic resin base material, after forming the lens portions on one surface, the lens portions are formed on the other surface. In order to prevent the relative positions of the two lens portions from shifting when forming the lens, it is necessary to align the X-axis and the y-axis of the thermoplastic resin base material.
- the formation of the lens portions on both surfaces of the thermoplastic resin substrate 2 is performed by using the second roll 12 used as the extrusion die roll and the radiation-curable resin die roll 14.
- the positioning in the longitudinal direction of the thermoplastic resin substrate 2 may be performed, for example, by setting the position of the radiation curable resin mold roll 14 in the longitudinal direction in advance. Adjustment of the relative displacement of the two lens portions (the first optical element portion 3 and the second optical element portion 4) formed on both surfaces is performed by adjusting the second roll and the Z or Z used as the extrusion die roll. Since only one-axis adjustment of moving the radiation-curable resin mold roll 14 along its axial direction is required, the lens portions (the first optical element portion 3 and the (2) The optical element part 4) can be formed accurately and easily.
- the film 6 having a property that it is difficult to peel off from the thermoplastic resin and the radiation-curable resin is provided between the surface of the thermoplastic resin base material 2 and the first optical element part 3.
- the first optical element portion 3 without peeling off from the thermoplastic resin base material 2. Can be worn.
- the film 6 since the film 6 is provided, it is possible to prevent the temperature of the surface of the thermoplastic resin substrate 2 from being lowered when the radiation-curable resin forming the first optical element portion 3 comes into contact with the surface of the thermoplastic resin substrate 2.
- the selection of the radiation-curable resin for forming the first optical element portion 3 becomes easy.
- a diffusion film, a film having various optical functions, or the like is used as the film 6, the optical sheet 1 finally obtained can have various optical functions.
- the molten thermoplastic resin base material 2 is fixed by the two cooling rolls of the first roll 11 and the second roll 12. (The surface temperature is lower than the glass transition point and the inner temperature is higher than the glass transition point), but the temperature of the molten thermoplastic resin substrate 2 is controlled.
- one or more cooling rolls may be additionally provided in addition to the two cooling rolls of the first roll 11 and the second roll 12. Specifically, for example, as shown in the manufacturing apparatus shown in FIG. 3, the molten thermoplastic resin base material 2 supplied from the T-die 10 is cooled by a pair of cooling rolls 20 and 21 and the cooling rolls 20 and 21 are cooled.
- thermoplastic resin base material 2 supplied from the T die 10 has its surface closely contacted with a part of the peripheral surface of the cooling roll 21 (for example, approximately half the circumference) and is sent. Cooled.
- the surface of the thermoplastic resin base material 2 released from the cooling roll 21 opposite to the surface on which the first optical element portion 3 is formed is a part of the peripheral surface of the third cooling roll 22. It is cooled by being closely transported along a part (for example, approximately half a circumference).
- the third cooling roll 22 is used as an extrusion die roll, like the second roll 12 of the manufacturing apparatus shown in FIG.
- thermoplastic resin base material 2 are sent in close contact with a part (for example, almost half circumference) of the peripheral surfaces of the cooling rolls 21 and 22, so that the thermoplastic resin base material 2
- the surface and the inside of 2 can be more reliably cooled, and the temperature inside the thermoplastic resin substrate 2 can be more reliably controlled.
- thermoplastic resin base material 2 is formed as an extrusion die roll.
- the thermoplastic resin substrate 2 comes into contact with the peripheral surface of the second roll 12 for a relatively long time, but the thermoplastic resin base 2 is short of contact with the first roll 11 and is released from the first roll 11 immediately. It is difficult to control the internal temperature to the desired temperature above the glass transition temperature.
- thermoplastic resin base material 2 when the thermoplastic resin base material 2 is cooled by the three cooling rolls 20, 21, and 22, both surfaces of the thermoplastic resin base material 2 And 22 are in contact with the peripheral surface for a relatively long time, so that it is easier to control the temperature inside the thermoplastic resin base material 2 to a desired temperature.
- thermoplastic resin base material 2 This makes it possible to adjust the temperature inside the thermoplastic resin base material 2 so that the thermoplastic resin base material 2 is securely adhered to the peripheral surface of the radiation curable resin mold roll 14, A precise lens portion can be reliably formed on the surface of the radiation-cured resin applied to the surface of the thermoplastic resin substrate 2.
- the radiation curing resin die roll 14 is placed on a lens portion formed by transferring the lens die of the cooling roll 21. It becomes possible to stack lens portions formed by transferring the lens mold.
- the radiation curable resin can be easily supplied from the application die 13 onto the thermoplastic resin substrate 2 and defoamed from the radiation curable resin.
- thermoplastic resin released from the radiation curable resin mold roll 14 was controlled to release the thermoplastic resin released from the radiation curable resin mold roll 14.
- a temperature control device see FIG. By cooling while adjusting the inside from the both sides to be equal to or lower than the glass transition point, the optical sheet 1 having rigidity without warpage or distortion can be continuously manufactured.
- thermoplastic resin base material 2 if a temperature control device (not shown) is used to cool the thermoplastic resin base material 2 so that the two surfaces have different temperatures, for example, the optical sheet 1 having a desired warp or distortion and having any rigidity can be obtained. Can be continuously produced.
Description
Claims
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US10/522,301 US7462305B2 (en) | 2003-05-23 | 2004-05-21 | Optical sheet manufacturing method and optical sheet |
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KR (1) | KR100618602B1 (ja) |
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Also Published As
Publication number | Publication date |
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KR20050054910A (ko) | 2005-06-10 |
US20060062969A1 (en) | 2006-03-23 |
CN1700977A (zh) | 2005-11-23 |
US7462305B2 (en) | 2008-12-09 |
KR100618602B1 (ko) | 2006-09-06 |
CN100429067C (zh) | 2008-10-29 |
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