JP2007155937A - Optical sheet for display, and optical sheet unit for display and method for manufacturing the optical sheet unit for display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical sheet for display, and an optical sheet unit for display and a method for manufacturing the optical sheet unit for display, with which workability in mounting a plurality of optical sheets is improved. <P>SOLUTION: In the method for manufacturing the optical sheet unit for display, the optical sheet unit is manufactured via a laminating step to form a laminate by laminating two or more optical sheets, and a mounting step to mount the laminate on a light source. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical sheet for display, an optical sheet unit for display, and a manufacturing method thereof, and more particularly to an optical sheet for display, an optical sheet unit for display, and a display optical sheet unit that are used for liquid crystal display elements and the like, It relates to a manufacturing method.

  In recent years, a film that diffuses light from a light source such as a light guide plate, a lens film that condenses light in the front direction, and the like are used for electronic displays such as liquid crystal display elements and organic EL.

  In this case, there are many examples in which various optical films (sheets) are laminated. For example, in Patent Document 1, a reflective polarizing film, a retardation film, and a semi-transmissive semi-reflective layer are laminated in an arbitrary order, and further, an absorptive polarizing film is laminated outside these three layers. A semi-reflective polarizing film is provided. And as many as five layers of films are interposed between the light source device and the liquid crystal cell. With this configuration, it is said that screen luminance is increased or power consumption is suppressed.

  Patent Documents 2 to 4 disclose a film in which the functions of one light diffusion film and a lens film are integrated.

  When a plurality of sheets (films) having the optical function described above are incorporated into a unit, it is common to repeat lamination and bonding for each sheet. Below, the incorporation process is demonstrated.

  FIG. 16 is a block diagram showing a conventional process for incorporating a plurality of sheets having optical functions into a unit, and FIG. 17 is a schematic diagram thereof. As shown in these drawings, the three types of optical sheets A, B, and C are manufactured by separate manufacturing steps 1, 2, and 3, and are further stacked through separate stacking steps 4, 5, and 6, respectively. Then, in the assembling step 7, the optical sheets A, B, and C are sequentially taken out from the respective laminates of the optical sheets A, B, and C, and are sequentially incorporated on the backlight unit D. Specifically, first, the optical sheet A is incorporated into the backlight unit D, and dust removal and scratch detection are performed at that time. Next, after the optical sheet B is incorporated on the optical sheet A and dust removal and scratch detection are performed, the optical sheet C is incorporated on the optical sheet B and dust removal and scratch detection are performed. Thus, an optical unit in which the optical sheets A, B, and C are incorporated on the backlight unit D is formed.

In this optical unit, the optical sheets A to C are not fixed and can move relatively freely. For this reason, the influence of expansion and contraction of the optical sheets A to C due to heat and humidity is reduced.
JP 2004-184575 A Japanese Patent Laid-Open No. 7-230001 Japanese Patent No. 3123006 JP-A-5-341132

  By the way, in the assembly process described above, each optical sheet A, B, C is taken out from the laminate of the optical sheets A, B, C and incorporated in order in the backlight unit D, so that the optical sheets A, B, C Assembling work is required for the number of sheets. For this reason, there has been a problem that the assembling work becomes complicated, dust is generated and the optical sheet is damaged, or the assembling order is easily mistaken. In particular, since a large optical sheet used for a large display is likely to be wrinkled or broken, there is a problem that it becomes difficult to provide a high-quality optical sheet unit as the number of assembling operations increases.

  The present invention has been made in view of such circumstances, and an optical sheet for display capable of improving workability when incorporating a plurality of optical sheets, and an optical sheet for display assembled using the optical sheet. It is an object to provide a unit and a manufacturing method thereof.

  In order to achieve the above object, the invention according to claim 1 includes a laminating step of laminating two or more optical sheets to form a laminate, and an assembling step of incorporating the laminate onto a light source. A manufacturing method of an optical sheet unit for a display, which is characterized by being manufactured.

  According to the present invention, a laminate is formed by laminating two or more optical sheets, and this laminate is incorporated on the light source. Therefore, when each optical sheet is incorporated on the light source one by one in order. In comparison, the assembly process can be performed easily and quickly.

  According to a second aspect of the present invention, in the first aspect of the invention, the stacking step includes stacking a plurality of sets of the two or more optical sheets, and the assembly step includes the stacked plurality of sets. It is characterized in that at least one set of laminated bodies is taken out and incorporated.

  According to a third aspect of the present invention, in the second aspect of the invention, at least one of the two or more optical sheets laminated in the laminating step is different in shape from the other optical sheets. And

  According to the invention of claim 3, when a plurality of sets of laminated bodies are laminated, one set of laminated bodies can be easily taken out, and an assembling process can be easily performed.

  The invention according to claim 4 is the invention according to claim 3, wherein the at least one optical sheet has a notch. In addition, it is preferable to form a notch part in all the optical sheets except the optical sheet laminated | stacked on the lowest side among the optical sheets which comprise a set of laminated bodies. Furthermore, it is preferable to form the cutout portion so that the size of the cutout portion increases as the optical sheet laminated on the upper side.

  According to a fifth aspect of the present invention, in the third aspect of the invention, the at least one optical sheet has a projecting piece protruding from a side edge. In addition, it is preferable to form a protrusion piece part in the optical sheet laminated | stacked on the lowest side among the optical sheets which comprise a set of laminated bodies.

  The invention according to claim 6 is the invention according to claim 3, wherein the at least one optical sheet has a through hole. In addition, it is preferable to form a through-hole in all the optical sheets except the optical sheet laminated | stacked on the lowest side among the optical sheets which comprise a set of laminated bodies.

  The invention according to claim 7 is the invention according to claim 2, characterized in that the two or more optical sheets laminated in the laminating step have different shapes for each laminate.

  According to invention of Claim 7, since the shape of an optical sheet differs for every laminated body, a set of laminated bodies can be taken out easily and an incorporating process can be performed easily.

  The invention according to an eighth aspect is the invention according to any one of the first to seventh aspects, wherein the two or more optical sheets have convex lenses formed in one axial direction adjacent to each other and arranged on substantially the entire surface. It includes a lens sheet and a diffusion sheet laminated on the front surface or the back surface of the lens sheet.

  The “lens sheet in which convex lenses formed in one axis direction are adjacently arranged on substantially the entire surface” is typically a lenticular lens or a prism sheet, and also includes a diffraction grating and the like.

  In order to achieve the above object, an invention according to claim 9 provides an optical sheet for display, wherein two or more optical sheets having different shapes are laminated.

  In order to achieve the above object, an invention according to claim 10 provides an optical sheet unit for display, which is constituted by incorporating the optical sheet for display according to claim 9 on a light source.

  According to the present invention, since a laminated body is formed by laminating two or more optical sheets, and the laminated body is incorporated on the light source, the assembling process can be performed easily and quickly.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, the configuration of examples of display optical sheets (first to sixth embodiments) manufactured in the manufacturing process to which the method for manufacturing an optical sheet unit for display according to the present invention is applied will be described, and then the optical sheet unit for display The manufacturing method will be described.

  FIG. 1 is a cross-sectional view illustrating a configuration of an example (first embodiment) of an optical sheet for display.

  The optical sheet for display 10 is an optical sheet module in which a first diffusion sheet 12, a first prism sheet 14, a second prism sheet 16, and a second diffusion sheet 18 are laminated in order from the bottom. is there.

  The first diffusion sheet 12 and the second diffusion sheet 18 are sheets in which beads are fixed to the surface (one side) of a transparent film (support) with a binder, and have predetermined light diffusion performance. The first diffusion sheet 12 and the second diffusion sheet 18 have different bead diameters (average particle diameter), and light diffusion performances are also different.

  A resin film can be used for the transparent film (support) used for the first diffusion sheet 12 and the second diffusion sheet 18. As the material of the resin film, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyester, polyolefin, acrylic, polystyrene, polycarbonate, polyamide, PET (polyethylene terephthalate), biaxially stretched polyethylene terephthalate, Known materials such as polyethylene naphthalate, polyamideimide, polyimide, aromatic polyamide, cellulose acylate, cellulose triacetate, cellulose acetate propionate, and cellulose diacetate can be used. Of these, polyester, cellulose acylate, acrylic, polycarbonate, and polyolefin can be preferably used.

  The bead diameters of the first diffusion sheet 12 and the second diffusion sheet 18 need to be 100 μm or less, and preferably 25 μm or less. For example, the average particle size can be 17 μm within a predetermined distribution range of 7 to 38 μm.

  The first prism sheet 14 and the second prism sheet 16 are lens sheets in which convex lenses formed in one axial direction are adjacently arranged on substantially the entire surface. For example, the pitch is 50 μm and the height of the unevenness. 25 μm, and the apex angle of the convex portion can be 90 degrees (right angle).

  The first prism sheet 14 and the second prism sheet 16 are arranged so that the axes of the convex lenses (prisms) are substantially orthogonal to each other. That is, in FIG. 1, the axis of the convex lens of the first prism sheet 14 is arranged in a direction perpendicular to the paper surface, and the axis of the convex lens of the second prism sheet 16 is arranged in a direction parallel to the paper surface. Yes. In FIG. 1, the second prism sheet 16 is shown in a direction different from the actual direction so that it can be understood that the cross section of the second prism sheet 16 is a convex lens.

  The material and manufacturing method of the first prism sheet 14 and the second prism sheet 16 can take various known modes. For example, a sheet-shaped resin material extruded from a die is placed opposite to the transfer roller that rotates at approximately the same speed as the resin material extrusion speed (a prism sheet reverse type is formed on the surface). A method for producing a resin sheet can be employed in which the pressure is sandwiched between nip roller plates rotating at the same speed and the uneven shape on the surface of the transfer roller is transferred to the resin material.

  In addition, a method of manufacturing a resin sheet in which a transfer mold plate (stamper) on which a reversal type of a prism sheet is formed and a resin plate are laminated by hot pressing and press molding by thermal transfer can be employed.

  As a resin material used in such a manufacturing method, a thermoplastic resin can be used, for example, polymethyl methacrylate resin (PMMA), polycarbonate resin, polystyrene resin, MS resin, AS resin, polypropylene resin, polyethylene resin. , Polyethylene terephthalate resin, polyvinyl chloride resin (PVC), thermoplastic elastomer, or a copolymer thereof, cycloolefin polymer, and the like.

  Further, as another manufacturing method, on the surface of the same transparent film (polyester, cellulose acylate, acrylic, polycarbonate, polyolefin, etc.) used for the first diffusion sheet 12 and the second diffusion sheet 18, A method of manufacturing a resin sheet that transfers and forms unevenness on the surface of the uneven roller (the reverse type of the prism sheet is formed on the surface) can be employed.

  More specifically, a transparent film in which an adhesive layer and a resin layer (for example, UV curable resin) are formed in two or more layers is continuously run by sequentially applying an adhesive and a resin to the surface. The transparent film is wound around a rotating concavo-convex roller, the concavo-convex surface of the concavo-convex roller is transferred to the resin layer, and the resin layer is cured in a state where the transparent film is wound around the concavo-convex roller (for example, UV irradiation). The manufacturing method of a concavo-convex sheet can be adopted. Note that no adhesive is required.

  In addition, the manufacturing method of the 1st prism sheet 14 and the 2nd prism sheet 16 is not necessarily limited to said example, If a desired uneven | corrugated shape can be formed on the surface, another manufacturing method can also be employ | adopted. .

  Next, another example (second embodiment) of the optical sheet for display will be described. FIG. 2 is a cross-sectional view showing the configuration of the display optical sheet 20. In addition, the same code | symbol is attached | subjected about the same and similar member as FIG. 1 (1st Embodiment), and the detailed description is abbreviate | omitted.

  The display optical sheet 20 is an optical sheet in which a diffusion sheet 12, a first prism sheet 14, and a second prism sheet 16 are laminated in order from the bottom. The second diffusion sheet 18 is omitted when a wide diffusion performance is not required as in the display optical sheet 10 described above.

  The display optical sheet 20 described above is disposed, for example, between the light source device and the liquid crystal cell, and is used so as to form a liquid crystal display element as a whole, as in the first embodiment.

  Next, still another example (third embodiment) of the optical sheet for display will be described. FIG. 3 is a cross-sectional view showing a configuration of the display optical sheet 30. In addition, the same code | symbol is attached | subjected about the same and similar member as FIG. 1 (1st Embodiment) and FIG. 2 (1st Embodiment), and the detailed description is abbreviate | omitted.

  The optical sheet for display 30 is an optical sheet in which the first diffusion sheet 12, the prism sheet 14, and the second diffusion sheet 18 are laminated in order from the bottom.

  In the display optical sheet 30, the second prism sheet 16 is omitted when the diffusion performance in the direction perpendicular to the paper surface as in the display optical sheet 10 described above is not required.

  The display optical sheet 30 described above is disposed, for example, between the light source device and the liquid crystal cell, and used to form a liquid crystal display element as a whole, as in the first embodiment.

  Next, still another example (fourth embodiment) of the optical sheet for display will be described. FIG. 4 is a cross-sectional view showing a configuration of the display optical sheet 40. In addition, the same code | symbol is attached | subjected about the member similar to FIG. 1 (1st Embodiment), FIG. 2 (2nd Embodiment), etc., and the detailed description is abbreviate | omitted.

  The display optical sheet 40 is an optical sheet in which the diffusion sheet 12 and the prism sheet 14 are laminated in order from the bottom. The second diffusion sheet 18 is omitted when a wide diffusion performance is not required as in the display optical sheet 10 described above, and a diffusion performance in a direction perpendicular to the paper surface as in the display optical sheet 10 described above is required. If not, the second prism sheet 16 is omitted.

  The display optical sheet 40 described above is arranged, for example, between the light source device and the liquid crystal cell and used to form a liquid crystal display element as a whole, as in the first embodiment.

  Next, another example (fifth embodiment) of the optical sheet for display will be described. FIG. 5 is a cross-sectional view showing the configuration of the display optical sheet 50. In addition, the same code | symbol is attached | subjected about the member similar to FIG. 1 (1st Embodiment), FIG. 2 (2nd Embodiment), etc., and the detailed description is abbreviate | omitted.

  The optical sheet for display 50 is an optical sheet in which the first prism sheet 14, the second prism sheet 16, and the diffusion sheet 18 are laminated in order from the bottom. The first diffusion sheet 12 is omitted when a wide diffusion performance is not required as in the optical sheet for display 10 described above.

  The display optical sheet 50 described above is disposed between the light source device and the liquid crystal cell, for example, as in the first embodiment, and used to form a liquid crystal display element as a whole.

  Next, another example (sixth embodiment) of the optical sheet for display will be described. FIG. 6 is a cross-sectional view showing the configuration of the display optical sheet 50. In addition, the same code | symbol is attached | subjected about the member similar to FIG. 1 (1st Embodiment), FIG. 2 (2nd Embodiment), etc., and the detailed description is abbreviate | omitted.

  The display optical sheet 60 is an optical sheet in which the first prism sheet 14 and the diffusion sheet 18 are laminated in order from the bottom. The first diffusion sheet 12 is omitted when a wide diffusion performance like the above-described optical sheet for display 10 is not required, and a diffusion performance in a direction perpendicular to the paper surface like the optical sheet for display 10 described above is required. If not, the second prism sheet 16 is omitted.

  The display optical sheet 60 described above is disposed, for example, between the light source device and the liquid crystal cell, and used to form a liquid crystal display element as a whole, as in the first embodiment.

  Next, the manufacturing method of the optical sheet unit for displays which concerns on this invention is demonstrated. This manufacturing method can be applied in common to the above-described display optical sheets 10 to 60. For convenience of explanation, the display optical sheet (second, third, or fifth embodiment) having a three-layer structure is used. ) Will be described. Hereinafter, the three-layer optical sheet is referred to as an optical sheet A, an optical sheet B, and an optical sheet C in order from the bottom surface after lamination.

  FIG. 7 is a block diagram showing a configuration of a production line for an optical sheet unit for display, and FIG. 8 is a schematic diagram showing an embodiment of the production process. In the schematic diagram of FIG. 8, the stacked optical sheets A, B, and C are displayed while being shifted, but in actuality, they are stacked in a completely stacked state.

  As shown in FIG. 7, the production line of the optical sheet unit for display includes the production steps 70, 72, and 74 of the optical sheets A, B, and C, and the optical sheets produced in the production steps 70, 72, and 74. A laminated body forming step 76 for forming a laminated body of A, B, and C, and an incorporating step 78 for incorporating the laminated body on the backlight unit are provided.

  As shown in FIG. 8, in the laminated body formation process 76, optical sheet A, B, C is repeatedly laminated | stacked in the order at the time of incorporation, ie, the order of optical sheet A, B, C from the lower side. Thereby, a laminated body composed of the optical sheets A, B, and C is formed, and a plurality of laminated bodies are laminated.

  In the assembling step 78, one set of stacked bodies ABC is taken out of the stacked multiple stacked bodies and is assembled on the backlight unit D. Thus, by handling and incorporating as a laminated body of optical sheets A, B, and C, the workability of the assembling process is improved.

  In addition, it is good to perform the assembly | attachment process which takes out the laminated body of the optical sheets A, B, and C and incorporates it on the backlight unit D automatically, for example with a suction lateral transfer apparatus.

  Further, in the above-described embodiment, the optical sheets A, B, and C are continuously stacked to stack a plurality of sets of the optical sheets A, B, and C. However, the present invention is limited to this. Instead, each time a set of laminated bodies is formed, it may be transferred to an assembling process to construct a continuous line.

  In the embodiment shown in FIG. 8, an example in which the optical sheets A, B, and C are formed in the same shape is shown. However, the present invention is not limited to this, and the optical sheets A, B, and C At least one optical sheet may have a different shape from other optical sheets. The following embodiment will be described.

  In the embodiment shown in FIG. 9, the corner portion of the optical sheet B is cut to form the cutout portion 80B, and the corner portion of the optical sheet C is cut larger than the corner portion of the optical sheet B to form the cutout portion 80C. Is formed. The notches 80B and 80C are formed at the peripheral edge that does not affect the optical performance when the optical sheets B and C are assembled as products. Further, the optical sheet A is formed in a rectangular shape without a notch.

  When the optical sheets A, B, and C configured as described above are stacked, the optical sheets A, B, and C appear at the positions of the notches 80B and 80C. Therefore, it becomes easy to take out the laminated body of the optical sheets A, B, and C one by one, and the working efficiency of the assembling process can be improved.

  In the embodiment shown in FIG. 9, the notches 80B and C are formed in only one of the four corners. However, the present invention is not limited to this, and two diagonal corners are formed. You may form, or you may form in all the corner parts.

  Further, the shape of the notches 80B and 80C is not limited to a rectangular shape, and may be other shapes such as a triangular shape. At that time, if the larger notch is formed in the optical sheet laminated on the upper side, all the optical sheets can be visually recognized when the laminated body is formed.

  FIG. 10 shows another embodiment. The optical sheet A shown in FIG. 10 includes a protruding piece portion 82A protruding sideways, and the optical sheets B and C are formed in a rectangular shape having no protruding piece portion. . When the optical sheets A, B, and C thus formed are laminated to form a laminated body, the protruding piece portion 82A of the optical sheet A appears. Therefore, even in the laminated state, the laminated position of the optical sheet A can be recognized by the projecting piece portion 82A. Therefore, by using the projecting piece portion 82A as a guide during the assembling process, a set of laminated bodies can be easily taken out, and the workability of the assembling process can be improved.

  FIG. 11 shows an embodiment of another configuration, and the optical sheet A shown in FIG. 11 includes a protruding piece portion 84A protruding sideways, and in each optical sheet A, the position of the protruding piece portion 84A is shifted. Has been. Moreover, the optical sheets B and C are formed in a rectangular shape having no projecting piece.

  When the optical sheets A, B, and C thus formed are repeatedly laminated and a plurality of laminated bodies are laminated, as shown in the top view of the laminated state on the right side of FIG. A plurality of 84A appears. That is, the protruding portion 84A of the optical sheet A appears for each of the laminated bodies of the optical sheets A, B, and C. Therefore, a set of laminated bodies can be easily taken out during the assembly process, and the workability of the assembly process can be improved.

  FIG. 12 shows an embodiment having another configuration, and the optical sheet A shown in FIG. 12 is provided with a protruding piece portion 84A projecting sideways, as in the optical sheet A of FIG. The position of the projecting piece 84A is shifted. Similarly to the optical sheet A, the optical sheets B and C are provided with protruding pieces 84B and 84C protruding sideways, and the positions of the protruding pieces 84B and 84C are shifted in each of the optical sheets B and C. Is formed. The optical sheets A, B, and C are formed in the same shape for each set of laminated bodies.

  When the optical sheets A, B, and C formed as described above were repeatedly laminated, the protruding pieces 84A, 84B, and 84C overlapped for each laminate, and the protruding pieces 84C, 84C, and so on of each set appeared. It becomes a state. Therefore, by grasping the set of overlapping projecting piece portions 84A, 84B, 84C, the set of stacked bodies can be easily taken out, and the workability of the assembly process can be improved.

  FIG. 13 shows an embodiment having another configuration, and the optical sheets B and C shown in FIG. 13 have holes 86B and 86C formed at the respective corners. The holes 86B and 86C are formed at the same position and with the same size, and when the optical sheets B and C are stacked, the hole 86B and the hole 86C coincide with each other. The optical sheet A is formed in a rectangular shape without holes.

  When the optical sheets A, B, and C formed as described above are stacked, the hole 86B of the optical sheet B and the hole 86C of the optical sheet C are aligned, and the optical sheet A is exposed in the holes 86B and 86C. become. Therefore, it becomes easy to take out a set of laminated bodies, and the workability of the assembly process can be improved.

  In the embodiment of FIG. 13, the work of taking out a set of laminated bodies onto the backlight unit D can be automated. That is, the holes 86B and 86C are formed slightly larger than the suction pad of the suction lateral transfer device (not shown), and the optical sheet A appearing at the positions of the holes 86B and 86C is sucked by the suction pad. Thereby, a set of laminated bodies can be taken out.

  14 (a) and 14 (b) show an embodiment of another configuration, and the optical sheets B and C shown in FIG. 14 are similar to the optical sheets B and C in FIG. The holes 86B and 86C are formed at the same position and the same size. Further, in the optical sheet A of FIG. 14, convex portions 88A having areas slightly smaller than the holes 86B and 86C are formed at the positions of the holes 86B and 86C of the optical sheets B and C. The thickness (height) of the convex portion 88A is larger than the thickness of the optical sheet B and smaller than the thickness obtained by adding the thickness of the optical sheet B and the thickness of the optical sheet C.

  When the optical sheets A, B, and C formed as described above are laminated, the hole 86B of the optical sheet B and the hole 86C of the optical sheet C coincide with each other, and as shown in FIG. The convex portion 88A of the optical sheet A is inserted into 86C. Therefore, each set of laminated bodies is positioned by the convex portions 88A of the optical sheet A and the holes 86B and 86C of the optical sheets B and C, so that the laminated bodies can be easily taken out and the assembly process is further facilitated. Can be done.

  In addition, also in the case shown in FIG. 14, the operation | work which takes out one set of laminated bodies on the backlight unit D can be automated.

  By the way, in the case where the optical sheets A, B, and C are laminated bodies having the same shape as in the embodiment shown in FIG. 8, the optical sheets A, B, and C are separately manufactured and laminated. In addition, it can be simultaneously manufactured and laminated as follows.

  FIG. 15 is a configuration diagram illustrating a manufacturing process of a laminated body (optical sheet for display) in which a plurality of optical sheets having the same shape are stacked. In addition, this figure demonstrates in the example which manufactures the optical sheet for a display of the 4 layer structure shown in FIG.

  The rolls 12B, 14B, 16B, and 18B provided at the left end of FIG. 15 are respectively the first diffusion sheet 12, the first prism sheet 14, and the second prism sheet shown in FIG. 16 and a roll around which the second diffusion sheet 18 is wound.

  The rolls 12B, 14B, 16B, and 18B are respectively supported by the rotation shafts of unillustrated feeding means, and the first diffusion sheet 12 and the first prism sheet 14 are provided by the rolls 12B, 14B, 16B, and 18B. The second prism sheet 16 and the second diffusion sheet 18 can be fed out at substantially the same speed.

  The fed first diffusion sheet 12, first prism sheet 14, second prism sheet 16, and second diffusion sheet 18 are respectively supported by guide rollers G, G... The laser head 24 is stacked on the upstream side.

  As a laser beam irradiation apparatus including the laser head 24, a YAG laser irradiation apparatus having a wavelength of 355 to 1064 nm, a semiconductor laser irradiation apparatus, a carbon dioxide laser irradiation apparatus having a wavelength of 9 to 11 μm, and the like can be adopted, and cutting (cutting process) is performed. The laser is irradiated with the power and frequency necessary for this.

  The laser head 24 is attached to an X drive robot axis or an XY drive robot axis that can move in the X direction (sheet width direction) or the XY direction, and can perform positioning to an arbitrary position and arbitrary trajectory movement. The entire laser head 24 may be moved according to the irradiation pattern of the laser beam, but the laser head 24 is separately placed (fixed), and only the laser beam is guided by the optical fiber to simplify the moving mechanism in the XY directions. You can also It is also possible to provide a known mechanism (suction device or the like) that sucks smoke generated during cutting by the laser head 24.

  Laser light is irradiated from the laser head 24 to a cut portion on the periphery of the laminate, and the periphery of the laminate is cut into a product size while moving the irradiation spot at a constant speed. In that case, you may make it weld partially.

  By passing through the above process, the laminated body by which the 1st diffusion sheet 12, the 1st prism sheet 14, the 2nd prism sheet 16, and the 2nd diffusion sheet 18 were laminated | stacked is formed. This laminated body is conveyed on the conveyor 26, and is sequentially stacked on the accumulating device 32 by the suction lateral transfer device 28, and a plurality of sets of laminated bodies are laminated. This laminated body is taken out one by one in the assembling step and incorporated on the backlight unit D.

  The sheet laminate 34 from which the optical sheet 10 for display has been punched out by the laser head 24 is taken up by a take-up roll 36 of a take-up device (not shown in detail).

  In this manner, the first diffusion sheet 12, the first prism sheet 14, the second prism sheet 16, and the second diffusion sheet 18 are stacked and then cut to form a laminate.

  In addition, in the manufacturing apparatus of the optical sheet for display mentioned above, you may make it cut using a punching press apparatus instead of cutting with a laser.

Sectional drawing of embodiment of the optical sheet for a display manufactured in the manufacture process using the manufacturing method of the optical sheet unit for a display which concerns on this invention. Sectional drawing of other embodiment of the optical sheet for displays Sectional drawing of other embodiment of the optical sheet for a display. Sectional drawing of other embodiment of the optical sheet for a display. Sectional drawing of other embodiment of the optical sheet for a display. Sectional drawing of other embodiment of the optical sheet for a display. Block diagram showing a method for manufacturing an optical sheet unit for display Schematic diagram showing the manufacturing method of optical sheet unit for display FIG. 8 is a schematic diagram in which the configuration of the optical sheet for display is different. FIG. 8 is a schematic diagram in which the configuration of the optical sheet for display is different. FIG. 8 is a schematic diagram in which the configuration of the optical sheet for display is different. FIG. 8 is a schematic diagram in which the configuration of the optical sheet for display is different. FIG. 8 is a schematic diagram in which the configuration of the optical sheet for display is different. FIG. 8 is a schematic diagram in which the configuration of the optical sheet for display is different. Schematic diagram showing the production line of optical sheets for displays Block diagram showing a conventional method for manufacturing an optical sheet unit for display Schematic diagram showing a conventional method for manufacturing an optical sheet unit for display

Explanation of symbols

  10, 20, 30, 40, 50, 60 ... optical sheet for display, 12 ... first diffusion sheet, 14 ... first prism sheet, 16 ... second prism sheet, 18 ... second diffusion sheet

Claims (10)

A laminating step of laminating two or more optical sheets to form a laminate;
An assembly step of incorporating the laminate on a light source;
A method for producing an optical sheet unit for a display, comprising: The laminating step is to laminate a plurality of sets of laminates composed of the two or more optical sheets,
2. The method of manufacturing an optical sheet unit for display according to claim 1, wherein in the assembling step, at least one set of the plurality of stacked layers is taken out and incorporated.   3. The optical sheet unit for display according to claim 2, wherein at least one of the two or more optical sheets laminated in the laminating step has a different shape from the other optical sheets. Method.   4. The method of manufacturing an optical sheet unit for display according to claim 3, wherein the at least one optical sheet has a notch.   4. The method of manufacturing an optical sheet unit for display according to claim 3, wherein the at least one optical sheet has a projecting piece protruding from a side edge.   4. The method of manufacturing an optical sheet unit for display according to claim 3, wherein the at least one optical sheet has a through hole.   The method for producing an optical sheet unit for a display according to claim 2, wherein the two or more optical sheets laminated in the laminating step have different shapes for each set of laminated bodies.   The two or more optical sheets include a lens sheet in which convex lenses formed in one axial direction are adjacently arranged on substantially the entire surface, and a diffusion sheet laminated on the front surface or the back surface of the lens sheet. The manufacturing method of the optical sheet unit for a display of any one of Claims 1-7 characterized by these.   An optical sheet for display, comprising two or more optical sheets having different shapes laminated.   An optical sheet unit for display, comprising the optical sheet for display according to claim 9 incorporated in a light source.

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