JP5584654B2 - Method for manufacturing light guide plate with protective film - Google Patents

Description

  The present invention relates to a method for manufacturing a light guide plate with a protective film, a light guide plate with a protective film, and a protective film used therefor.

  A light guide plate with a protective film in which a protective film is bonded to the surface of an acrylic resin plate used as a light guide plate is known (for example, see Patent Document 1). The surface of this acrylic resin plate is flat.

JP-A-8-170056

  In recent years, a light guide plate (so-called shape light guide plate) having a convex portion formed on the surface has attracted attention. This inventor examined sticking a protective film on the surface of the light-guide plate in which the convex part was formed. However, depending on the properties of the protective film, it has been found that when the protective film is bonded to the light guide plate and then cut into a predetermined size, the end portion of the protective film may be peeled off from the light guide plate. This problem does not occur when the surface of the light guide plate is flat, but occurs when a convex portion is formed on the surface of the light guide plate.

  The present invention has been made in view of the above circumstances, and a method for producing a light guide plate with a protective film having excellent adhesive properties between the surface on which the convex portions of the light guide plate are formed and the protective film, and with a protective film An object is to provide a light guide plate and a protective film used therefor.

In order to solve the above-described problems, a method for manufacturing a light guide plate with a protective film according to one aspect of the present invention includes a sheet manufacturing process for manufacturing a continuous resin sheet by continuously extruding a heated and melted resin from a die, Using a shape roll having a transfer mold formed on the surface, the transfer mold is transferred to the surface of the continuous resin sheet, whereby a convex portion corresponding to the recess formed in the transfer mold is formed on the surface. A transfer step for manufacturing an optical plate, a bonding step for bonding a protective film having a tensile elastic modulus of 250 N / mm ² or more to the surface on which the convex portions of the light guide plate are formed, and the protective film are bonded. Cutting the light guide plate.

In the case of using a light guide plate having convex portions formed on the surface, when the protective film having a tensile elastic modulus of less than 250 N / mm ² is cut, the end of the protective film is guided when the light guide plate to which the protective film is bonded is cut. It tends to be easily peeled off from the light plate. On the other hand, in the protective film having a tensile modulus of less than 250 N / mm ² , even when the light guide plate to which the protective film is bonded is cut, the end portion of the protective film is suppressed from peeling from the light guide plate. Therefore, the light guide plate with a protective film having excellent adhesive properties between the surface on which the convex portions of the light guide plate are formed and the protective film is obtained.

  The light guide plate with a protective film according to one aspect of the present invention is manufactured by the method for manufacturing the light guide plate with a protective film.

  The protective film which concerns on 1 side of this invention is used for the said light-guide plate with a protective film.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the light guide plate with a protective film excellent in the adhesive characteristic between the surface in which the convex part of the light guide plate was formed, and a protective film, the light guide plate with a protective film, and the protective film used therefor are provided. Is done.

It is a schematic block diagram which shows the manufacturing apparatus of the light-guide plate with a protective film which concerns on embodiment. It is a perspective view which shows the structure of a light-guide plate typically. It is sectional drawing which shows typically the recessed part formed in the transfer type | mold, and the convex part formed in the light-guide plate. It is sectional drawing of the light-guide plate with a protective film which concerns on embodiment. It is a flowchart which shows the procedure of the manufacturing method of the light-guide plate with a protective film which concerns on embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and duplicate descriptions are omitted.

(Production equipment for light guide plate with protective film)
Drawing 1 is a schematic structure figure showing a manufacturing device of a light guide plate with a protective film concerning an embodiment. The manufacturing apparatus 100 of a light guide plate with a protective film shown in FIG. 1 is an apparatus that can be used for manufacturing the light guide plate with a protective film of the present embodiment. The light guide plate manufacturing apparatus 100 with the protective film includes a light guide plate manufacturing apparatus 50, a protective film bonding apparatus 70, and a cutting apparatus 80.

  The light guide plate manufacturing apparatus 50 includes a die 51 that continuously extrudes a heated and melted resin to obtain a continuous resin sheet 60, and a first press that presses the continuous resin sheet 60 extruded from the die 51 from both sides in the thickness direction. A roll 52A and a second pressing roll 52B. The light guide plate manufacturing apparatus 50 may include a preloading roll 52D, if necessary, before the first pressing roll 52A. The preload roll 52D has the same configuration as the first pressing roll 52A. The preload roll 52D sandwiches and presses the continuous resin sheet 60 between the first press roll 52A. In addition, the light guide plate manufacturing apparatus 50 includes a resin charging port 57 for charging a resin as a raw material, and an extruder 58 for extruding the resin charged from the resin charging port 57.

  52 A of 1st press rolls and the 2nd press roll 52B are set as the structure which can rotate around the mutually parallel rotation axis. The first pressing roll 52 </ b> A and the second pressing roll 52 </ b> B are arranged apart from each other in the thickness direction of the continuous resin sheet 60, and the interval between the peripheral surfaces is set according to the thickness of the continuous resin sheet 60. As shown in FIG. 3, a transfer mold 53 corresponding to the concavo-convex shape transferred to the continuous resin sheet 60 is formed on the peripheral surface of the second pressing roll 52 </ b> B. Details will be described later. The second pressing roll 52B corresponds to a shape roll. The second pressing roll 52B provided with the transfer mold 53 is also referred to as a transfer roll. In this way, the light guide plate 30 is manufactured.

  The protective film bonding apparatus 70 includes a first pressure roll 72A and a first pressure roll 72A that press the protective film 40 and 42 bonded to both sides of the light guide plate 30 supplied from the light guide plate manufacturing apparatus 50 from both sides in the thickness direction. 2 press rolls 72B and protective film rolls 72C and 72D around which protective films 40 and 42 are wound, respectively. The protective film 40 is supplied from the protective film roll 72C to the first pressing roll 72A. The protective film 42 is supplied from the protective film roll 72D to the second pressing roll 72B. The protective film is also called a masking film. The protective film 42 may not be bonded to the light guide plate 30. In that case, the protective film roll 72D becomes unnecessary.

  The cutting device 80 cuts the light guide plate 30 to which the protective films 40 and 42 supplied from the protective film bonding device 70 are bonded to a predetermined size. In this way, the light guide plate 90 with a protective film is manufactured.

(Light guide plate)
FIG. 2 is a perspective view schematically showing the configuration of the light guide plate. FIG. 2 shows a part of the light guide plate 30. The light guide plate 30 can be used as a light guide plate of a surface light source device (for example, a backlight) mounted on a transmissive image display device (for example, a liquid crystal display). Examples of the surface light source device include an edge light type surface light source device in which a light source such as an LED is disposed on the side surface 33 of the light guide plate 30 and the light incident from the side surface 33 of the light guide plate 30 is emitted to the front side.

  Usually, the back surface 32 (surface opposite to the front surface 31) of the light guide plate 30 is subjected to reflection processing for irregularly reflecting light incident from the side surface 33. As a printing method performed as reflection processing, ink jet printing may be performed in addition to silk printing. Or as a method of reflection processing, you may give a dot-shaped unevenness | corrugation by laser irradiation instead of printing.

On the surface 31 of the light guide plate 30, a plurality of protrusions extending in the first direction ( X- axis direction) and arranged in parallel in a second direction ( Y- axis direction) orthogonal to the first direction 35 is formed. The concavo-convex shape having the convex portions 35 formed on the surface 31 is formed by a transfer process described later.

  The light guide plate 30 is made of a translucent resin. The refractive index of the translucent resin is usually 1.49 to 1.59. As the translucent resin used for the light guide plate 30, a thermoplastic resin that becomes a molten state when heated may be used. For example, methacrylic resin (acrylic resin), styrene resin, carbonate resin, cyclic olefin resin, MS resin (a copolymer of acrylic and styrene) can be used. Examples of the methacrylic resin include a copolymer of methyl methacrylate and methyl acrylate.

  Note that a thermosetting resin that cures when heated may be used as the translucent resin used for the light guide plate 30. In the translucent resin used for the light guide plate 30, additives such as a light diffusing agent, an ultraviolet absorber, a heat stabilizer, and an antistatic agent may be added.

(Transfer type)
FIG. 3 is a cross-sectional view schematically showing a concave portion formed in the transfer mold and a convex portion formed in the light guide plate. FIG. 3 shows a part of the transfer mold 53 and the light guide plate 30. The transfer mold 53, a plurality of recesses 53 a provided on a surface of the second press roll 52B (shaped roll) is formed. The plurality of concave portions 53 a correspond to the plurality of convex portions 35. For example, the concave portion 53 a is a groove which is formed continuously in the circumferential direction of the second press roll 52B (shaped rolls). Pitch P between the plurality of recesses 53 a is generally 30μm or more, preferably 50μm or more. The pitch P is, for example, 30 μm to 800 μm, and the depth D of the concave portion 53 a is, for example, 30 μm to 500 μm. The pitch P refers to the distance between the centers in the Y-axis direction between adjacent concave portions 53 a (bottom portions), and the depth D of the recesses 53 a, from the opening surface of the concave portion 53 a to the bottom of the recess 53 a Say distance.

As the cross-sectional shape of the recess 53 a transfer mold 53, semi-circular, semi-elliptical shape and the like. The cross-sectional shape of the recess 53 a may be a V-shape having an acute angle portion corresponding to the prism-shaped.

  As a method for producing the transfer mold 53, the surface of a metal roll made of stainless steel, steel, or the like is subjected to, for example, chrome plating, copper plating, nickel plating, nickel-phosphorous plating, etc. For example, a removal processing using a diamond tool or a metal grindstone, laser processing, or chemical etching may be performed to process the shape. However, it is not specifically limited to these methods.

  Further, after the transfer mold 53 is formed on the surface of the transfer roll, for example, a plating process such as chromium plating, copper plating, nickel plating, nickel-phosphorous plating or the like may be performed at a level that does not impair the accuracy of the surface shape.

(Light guide plate with protective film)
FIG. 4 is a cross-sectional view of the light guide plate with a protective film according to the embodiment. FIG. 4 shows a part of the light guide plate 90 with a protective film. The light guide plate 90 with a protective film shown in FIG. 4 includes a light guide plate 30 having a convex portion 35 formed on the surface 31 and a protective film 40 bonded to the surface 31 on which the convex portion 35 is formed. In the light guide plate 90 with the protective film, a gap is formed between the adjacent convex portions 35 between the protective film 40 and the light guide plate 30. The light guide plate 90 with the protective film may further include a protective film 42 bonded to the back surface 32 of the light guide plate 30.

  The protective films 40 and 42 include, for example, a base material and an adhesive layer formed on the base material, and the adhesive layer is disposed on the light guide plate 30 side. The protective film 40 protects the surface 31 of the light guide plate 30 and is peeled off when the light guide plate 30 is used. The protective film 42 protects the back surface 32 of the light guide plate 30 and is peeled off when the light guide plate 30 is used. The base material of the protective film 40 consists of polymers, such as a polypropylene, for example. The protective film 42 may have the same configuration as the protective film 40 or may have a different configuration.

  The peel strength between the light guide plate 30 and the protective film 40 after the protective film 40 is bonded to the light guide plate 30 heated to 40 ° C. is 0.1 to 0.8 N / 25 mm. Similarly, the peel strength between the light guide plate 30 and the protective film 40 after bonding the protective film 40 to the light guide plate 30 heated to 70 ° C. is 0.1 to 0.8 N / 25 mm.

  The peel strength is a value measured by preparing a sample with a width of 25 mm in accordance with JISZ0237 and peeling the protective film in the 180 ° direction at a pulling speed of 300 mm / min using an autograph.

The tensile modulus of the protective film 40 is a 250 N / mm ² or more, it may also be 450 N / mm ² or more, may be 1000 N / mm ² or less.

  The tensile elastic modulus is a value measured with a 1 kN load in accordance with JIS K7161.

(Manufacturing method of light guide plate with protective film)
FIG. 5 is a flowchart illustrating the procedure of the method for manufacturing the light guide plate with the protective film according to the embodiment. The manufacturing method of the light-guide plate with a protective film of this embodiment can be implemented using the manufacturing apparatus 100 of the light-guide plate with a protective film shown in FIG. 1, for example. As shown in FIG.1 and FIG.5, the manufacturing method of the light-guide plate with a protective film of this embodiment is a sheet | seat manufacturing process (S1) which extrudes the resin of a heat-melting state continuously from the die | dye 51, and shape | molds the continuous resin sheet 60. ) And the second pressing roll 52B (shape roll) having the transfer mold 53 formed on the peripheral surface, and transferring the transfer mold 53 to the surface of the continuous resin sheet 60, thereby forming a recess formed in the transfer mold 53. a transfer step of projections 35 to produce the light guide plate 30 formed on the surface 31 corresponding to 53 a (S2), the surface 31 of the projecting portion 35 is formed of the light guide plate 30, a tensile modulus of 250 N / mm A bonding step (S3) for bonding ^two or more protective films 40 and a cutting step (S4) for cutting the light guide plate 30 on which the protective films 40 are bonded are provided.

(Sheet manufacturing process)
In the sheet manufacturing process, the resin is continuously extruded from the die 51 in a heated and melted state to manufacture the continuous resin sheet 60. Examples of the resin include a thermoplastic resin that becomes a molten state when heated.

  As the die 51 for continuously extruding the resin in a heated and melted state, for example, a metal T die similar to that used in a normal extrusion molding method is used. In order to extrude the resin from the die 51 in a heated and melted state, an extruder 58 is used as in a normal extrusion molding method. The extruder 58 may be a single screw extruder or a twin screw extruder. The resin is heated in the extruder 58, sent to the die 51 in a molten state, and extruded. The resin extruded from the die 51 is continuously extruded into a sheet shape to form a continuous resin sheet 60. The thickness of the continuous resin sheet 60 is, for example, not less than 1.0 mm and not more than 4.5 mm.

(Transfer process)
The transfer process (S2) is a pressing process in which the continuous resin sheet 60 manufactured in the sheet manufacturing process (S1) is pressed by being sandwiched between the first pressing roll 52A (pressing roll) and the second pressing roll 52B (shape roll). A conveying step of conveying the continuous resin sheet 60 pressed in the pressing step while being in close contact with the peripheral surface of the second pressing roll 52B, and a continuous resin sheet 60 conveyed in the conveying step of the second pressing roll 52B And a peeling step of peeling from the surface (transfer mold 53).

(Pressing process)
The continuous resin sheet 60 obtained in the sheet manufacturing step (S1) is simultaneously pressed from both sides in the sheet thickness direction by the pressing step with the first pressing roll 52A and the second pressing roll 52B as shown in FIG. It is inserted and pressed.

  At this time, the surface temperature of the continuous resin sheet 60 immediately before coming into contact with the second pressing roll 52B is, for example, in the range of 180 ° C to 250 ° C. The surface temperature can be adjusted by changing the set temperature of the extruder 58 and changing the set temperature of the die 51. In addition, the surface temperature of the continuous resin sheet 60 can be measured using an infrared thermometer.

  In this pressing step, the shape of the transfer mold 53 formed on the surface of the second pressing roll 52B (shape roll) is transferred to the continuous resin sheet 60. The transfer mold 53 provided on the surface of the transfer roll is pressed against the surface of the continuous resin sheet 60, and the surface shape is transferred to the continuous resin sheet 60 as a reverse mold.

  As the first and second pressing rolls 52A and 52B, metal rolls made of a metal such as stainless steel or steel are usually used, and the diameter is usually 100 mm to 500 mm. When metal rolls are used as the first and second pressing rolls 52A and 52B, the surface thereof may be subjected to plating treatment such as chromium plating, copper plating, nickel plating, nickel-phosphorous plating, or the like. Further, the surface (circumferential surface) of the first pressing roll 52A may be a mirror surface or may be a transfer surface provided with unevenness such as embossing.

  In addition, you may implement the pre-pressing process pressed previously before a press process. In the preloading process, the continuous resin sheet 60 manufactured in the sheet manufacturing process (S1) is pressed in advance by being sandwiched between the preloading roll 52D and the first pressing roll 52A. The pressed continuous resin sheet 60 is conveyed while being in close contact with the peripheral surface of the first pressing roll 52A, and the pressing process is executed by the first and second pressing rolls 52A and 52B.

(Conveying process)
A conveyance process is a process of conveying according to rotation of the 2nd press roll 52B in the state where the continuous resin sheet 60 was stuck to the peripheral surface of the 2nd press roll 52B.

(Peeling process)
A peeling process is a process of peeling the continuous resin sheet 60 from the surrounding surface of the 2nd press roll 52B.

  The light guide plate 30 is manufactured through the above-described steps. The temperature of the light guide plate 30 immediately after the peeling step is, for example, 90 ° C. or higher.

(Bonding process)
In a bonding process (S3), as shown in FIG. 1, the protective films 40 and 42 are bonded to the light-guide plate 30 using the protective film bonding apparatus 70. As shown in FIG. The light guide plate 30 and the protective films 40 and 42 are sandwiched and pressed simultaneously from both sides in the thickness direction of the light guide plate 30 by the first pressing roll 72A and the second pressing roll 72B. As the first pressing roll 72 </ b> A and the second pressing roll 72 </ b> B rotate, the protective film 40 is bonded to the surface 31 of the light guide plate 30, and the protective film 42 is bonded to the back surface 32 of the light guide plate 30. The protective film 40 is supplied to the first pressing roll 72A by rotating the protective film roll 72C, and is bonded to the light guide plate 30 in a state of being in close contact with the peripheral surface of the first pressing roll 72A. The protective film 42 is supplied to the second pressing roll 72B by rotating the protective film roll 72D, and is bonded to the light guide plate 30 in close contact with the peripheral surface of the second pressing roll 72B.

  The temperature of the light guide plate 30 at the time of bonding can be controlled by adjusting the temperature of the light guide plate 30 immediately after the peeling step, and may be 40 to 70 ° C or 50 to 60 ° C. . The temperature of the light guide plate 30 at the time of bonding can be adjusted by, for example, the distance between the light guide plate manufacturing apparatus 50 and the protective film bonding apparatus 70.

(Cutting process)
In the cutting step (S4), as shown in FIG. 1, the light guide plate 30 to which the protective films 40 and 42 are bonded is cut into a predetermined size using a cutting device 80. Thus, the light guide plate 90 with a protective film shown in FIG. 4 is obtained.

In the case of using a light guide plate having convex portions formed on the surface, when the protective film having a tensile elastic modulus of less than 250 N / mm ² is cut, the end of the protective film is guided when the light guide plate to which the protective film is bonded is cut. It tends to be easily peeled off from the light plate. This is thought to be because the protective film stretches during bonding and shrinks after bonding. On the other hand, in the protective film 40 having a tensile modulus of elasticity of less than 250 N / mm ² , the end portion of the protective film 40 is prevented from peeling from the light guide plate 30 even when the light guide plate 30 to which the protective film 40 is bonded is cut. The Therefore, in the manufacturing method of the light guide plate with a protective film according to the present embodiment, the light guide plate 90 with the protective film having excellent adhesion characteristics between the surface 31 on which the convex portions 35 of the light guide plate 30 are formed and the protective film 40 is provided. can get.

  As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment.

(Example)
EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example, a reference example, and a comparative example, this invention is not limited to a following example.

Example 1
The protective film was bonded to the light guide plate preheated to 40 ° C. using the manufacturing apparatus of the light guide plate with the protective film shown in FIG. As the light guide plate, a protective film was bonded to the surface on which the convex portions were formed, using a shape light guide plate having convex portions on the surface. As the protective film, a polypropylene film (trade name: L7330, manufactured by Hitachi Chemical Co., Ltd.) was used. About the protective film, based on JISK7161, the tensile elasticity modulus was measured by 1 kN load. The results are shown in Table 1. Then, it cut | disconnected to the magnitude | size of width 25mm x length 300mm, and produced the light-guide plate with a protective film.

  A protective film was similarly bonded to the light guide plate preheated to 70 ° C. instead of 40 ° C., and cut into a size of 25 mm wide × 300 mm long to prepare a light guide plate with a protective film.

  About two types of obtained light guide plates with protective films, in accordance with JISZ0237, the protective film is peeled in the longitudinal direction at a pulling speed of 300 mm / min by an autograph and the peel strength (N / 25 mm) is measured. did. The results are shown in Table 1.

(Adhesive property evaluation)
A protective film was similarly bonded to the light guide plate preheated to 50 to 60 ° C. instead of 40 ° C., and cut to A4 size to prepare a light guide plate with a protective film. About the obtained light-guide plate with a protective film, it was evaluated whether the protective film had peeled off 5 mm or more in length from the edge part. The case where peeling of the protective film from the end portion was 5 mm or more was regarded as peeling, and the case where peeling of the protective film from the end portion was less than 5 mm was regarded as no peeling. The results are shown in Table 1.

(Example 2)
A light guide plate with a protective film was prepared and evaluated in the same manner as in Example 1 except that a polypropylene film (trade name: FM-470, manufactured by Daio Processed Paper Co., Ltd.) was used as the protective film. The results are shown in Table 1.

(Example 3)
A light guide plate with a protective film was prepared and evaluated in the same manner as in Example 1 except that a polypropylene film (trade name: FM-382, manufactured by Daio Processed Paper Co., Ltd.) was used as the protective film. The results are shown in Table 1.

(Comparative Example 1)
A light guide plate with a protective film was prepared and evaluated in the same manner as in Example 1 except that a polyethylene film (trade name: # 6318B-60, manufactured by Sekisui Chemical Co., Ltd.) was used as the protective film. The results are shown in Table 1.

(Reference Example 1)
Instead of using a light guide plate (planar light guide plate) with a flat surface instead of a shape light guide plate with convex portions formed on the surface, a polyethylene film (trade name: ML2020, manufactured by Hitachi Chemical Co., Ltd.) is used as a protective film. Produced a light guide plate with a protective film in the same manner as in Example 1, and evaluated. The results are shown in Table 1.

  As shown in Table 1, in Examples 1 to 3, a light guide plate with a protective film having excellent adhesive properties was obtained. On the other hand, in Comparative Example 1, good results were not obtained. Therefore, in a shape light-guide plate, it turned out that the light-guide plate with a protective film excellent in the adhesive characteristic is obtained by making the tensile elasticity modulus of a protective film into a specific range.

  DESCRIPTION OF SYMBOLS 30 ... Light guide plate, 31 ... Surface, 35 ... Convex part, 40, 42 ... Protective film, 51 ... Die, 52A ... 1st press roll, 52B ... 2nd press roll (shape roll), 52D ... Preload roll, 53 ... Transfer mold, 57 ... resin inlet, 58 ... extruder, 60 ... continuous resin sheet, 90 ... light guide plate with protective film.

Claims (10)

A sheet manufacturing process for continuously extruding a heat-melted resin from a die to manufacture a continuous resin sheet;
By using the shape roll having the transfer mold formed on the peripheral surface, the transfer mold was transferred to the surface of the continuous resin sheet, so that a convex portion corresponding to the recess formed in the transfer mold was formed on the surface. A transfer process for producing a light guide plate;
A bonding step of bonding a protective film having a tensile elastic modulus of 250 N / mm ² or more to the surface on which the convex portion of the light guide plate is formed,
A cutting step of cutting the light guide plate on which the protective film is bonded;
The manufacturing method of the light-guide plate with a protective film containing this. A plurality of the convex portions are formed on the surface of the light guide plate,
The method of manufacturing a light guide plate with a protective film according to claim 1, wherein the plurality of protrusions extend in the first direction and are arranged in parallel in a second direction orthogonal to the first direction. .   The manufacturing method of the light-guide plate with a protective film of Claim 1 or 2 whose thickness of the said continuous resin sheet is 1.0 mm or more and 4.5 mm or less. The transfer mold is formed with a plurality of the recesses,
The method for manufacturing a light guide plate with a protective film according to any one of claims 1 to 3, wherein the plurality of recesses are grooves formed continuously in the circumferential direction of the shape roll.   The manufacturing method of the light guide plate with a protective film according to claim 4, wherein a pitch of the plurality of recesses is 30 μm or more, and a depth of the plurality of recesses is 30 μm or more.   In the obtained light guide plate with a protective film, the space | gap is formed between the said convex parts between the said protective film and the said light guide plate, The protection as described in any one of Claims 1-5. Manufacturing method of light guide plate with film. A light guide plate having convex portions formed on the surface;
A protective film bonded to the surface;
With
A light guide plate with a protective film, wherein the protective film has a tensile elastic modulus of 250 N / mm ² or more. A plurality of the convex portions are formed on the surface of the light guide plate,
The light guide plate with a protective film according to claim 7, wherein the plurality of convex portions extend in the first direction and are arranged in parallel in a second direction orthogonal to the first direction.   The light guide plate with a protective film according to claim 7 or 8, wherein a gap is formed between the adjacent convex portions between the protective film and the light guide plate.   The light-guide plate with a protective film manufactured by the manufacturing method of the light-guide plate with a protective film as described in any one of Claims 1-6.

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