JP2010022897A - Apparatus and method for cleaning sheet-like member, method of manufacturing sheet-like member and method of manufacturing backlight unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for cleaning a sheet-like member which allow the reduction of the number of processes required for manufacture of the sheet-like member while removing foreign matter on the sides of the sheet-like member. <P>SOLUTION: In the sheet-like member cleaning apparatus 1, a foreign matter removing section 4 has an adhesive flat removal surface 11. When moving while keeping in nearly parallel with the side 12 of a sheet-like member 2 on a supporting base 7, the removal surface 11 positions the sheet-like member 2 and simultaneously comes in entire contact with the side 12. When the removal surface 11 leaves the side 12, foreign matter 28 adhered to the side 12 transfers to the removal surface 11, resulting in cleaning of the side 12 of the sheet-like member 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sheet-like member cleaning device and a sheet-like member cleaning method for removing foreign matter adhering to the side surface of the sheet-like member, a method for manufacturing the sheet-like member, and a backlight unit using the sheet-like member. It relates to a manufacturing method.

  A liquid crystal display (abbreviated as LCD) is used in mobile phones, notebook computers, LCD monitors, liquid crystal televisions, and the like. The transmissive liquid crystal display device requires a backlight unit including a light source in addition to the transmissive liquid crystal panel. In order to improve the display performance of the transmissive liquid crystal display device, an optical sheet for adjusting the light of the light source is incorporated in the backlight unit. The optical sheet includes various types of sheet pieces including a prismatic structured sheet and a diffusion sheet for improving output luminance, illumination uniformity, and viewing angle.

  FIG. 7 is a perspective view showing a conventional liquid crystal display device 100. The liquid crystal display device 100 includes a backlight unit 150 and a transmissive liquid crystal panel 151. A backlight unit 150 is provided on the back side of the liquid crystal panel 151.

The backlight unit 150 includes a light source 152, a light guide plate 153, a reflection plate 154, and the optical sheet 110. The light source 152 is, for example, a light emitting diode (Light-Emitting
This is realized by a diode (abbreviation LED). The backlight unit 150 is an edge light type illumination device. A light source 152 is provided on one side surface of the light guide plate 153. A reflection plate 154 is provided on one main surface portion of the light guide plate 153. The optical sheet 110 is provided on the other main surface portion of the light guide plate 153. The optical sheet 110 is located between the light guide plate 153 and the liquid crystal panel 151. The optical sheet 110 is a substantially rectangular sheet-like member, and is configured by laminating a plurality of sheet pieces 111a to 111d. In FIG. 7, four sheet pieces 111a to 111d are stacked.

  Illumination light emitted from the light source 152 enters the light guide plate 153 from one side, exits from the other main surface of the light guide plate 153, and irradiates the liquid crystal panel 151 through the optical sheet 110. The optical sheet 110 is configured to exhibit desired optical performance by appropriately diffusing and condensing illumination light emitted from the other main surface of the light guide plate 153. For example, the optical sheet 110 is configured so that the backlight unit 150 can uniformly illuminate the liquid crystal panel 151 throughout.

  The four sheet pieces 111 a to 111 d constituting the optical sheet 110 are stacked one by one between the light guide plate 153 and the liquid crystal panel 151. At the time of manufacturing the liquid crystal display device 100, there are some cautions regarding handling and assembly of the plurality of sheet pieces 111a to 111d. Since the individual sheet pieces 111a to 111d are easily damaged, a protective cover is attached, and it is necessary to remove the protective cover at the time of assembly. In addition, when the protective cover is removed, the sheet pieces 111a to 111d may be damaged. Furthermore, since the plurality of sheet pieces 111a to 111d are stacked one by one, it takes time to manufacture the optical sheet 110, and an opportunity for foreign matter to enter between the sheet pieces 111a to 111d, and the sheet pieces 111a to 111d. The chance of damaging itself increases. As a result, the manufacturing throughput of the liquid crystal display device 100 decreases, and the manufacturing yield decreases.

  The sheet pieces 111a to 111d of the optical sheet 110 are formed, for example, by being cut out into a predetermined shape from a long strip-shaped original sheet. When cutting the sheet piece, foreign matter such as dust may be generated. The generated foreign matter adheres to the side surfaces of the cut sheet pieces 111a to 111d. In addition, the foreign matter may adhere to the main surface of the outermost sheet piece among the stacked sheet pieces 111 a to 111 d, that is, the front and back surfaces of the optical sheet 110.

  In recent years, with the increase in size and miniaturization of liquid crystal display devices, it has been extremely demanded to reduce foreign substances adhering to the optical sheet inside the liquid crystal display device. As a technique for solving such a problem, there are techniques disclosed in Patent Document 1 and Patent Document 2.

  Patent Document 1 proposes a method for mounting a sheet-like member that is a laminate of film-like sheet pieces for light adjustment. In the mounting method, at least two of the plurality of sheet pieces in the sheet-like member are bonded, and a zero gap joint portion used for bonding is provided at a position where it falls outside the display area of the display device. .

  Patent Document 2 proposes a cleaning device for a sheet-like member that is a laminate of a plurality of sheet pieces. In Patent Document 2, a plurality of sheet pieces in a sheet-like member are joined to each other at the periphery of the sheet pieces. As shown in FIG. 8, the cleaning device of Patent Document 2 includes a pair of cylindrical adhesive rollers 201 and 202. The sheet-like member 200 is conveyed in the conveyance direction 203 substantially parallel to the main surface of the sheet-like member 200 itself. The pair of adhesive rollers 201 and 202 are arranged so that the side surfaces of the cylinders are in contact with both side surfaces of the sheet-like member 200 being conveyed, and rotate around the central axis of the adhesive rollers 201 and 202 themselves. Is possible. The central axes of the adhesive rollers 201 and 202 are orthogonal to the conveying direction 203 of the sheet-like member 200. When the side surface of each adhesive roller 201, 202 contacts the side surface of the sheet-like member 200 conveyed between the pair of adhesive rollers 201, 202, foreign matter on the side surface is removed.

JP-T-2006-513352 JP 2007-155941 A

  As described above, Patent Document 1 and Patent Document 2 disclose a structure in which a plurality of sheet pieces are stacked and the sheet pieces are joined to each other at the periphery of the sheet-like member. Yes. However, when the sheet-like member having such a configuration is handled as an optical sheet in the assembly process of the backlight unit, if the sheet-like member is restrained at one point or one side of the outer periphery of the sheet-like member, It is conceivable that a gap is opened in an unconstrained portion of the sheet piece. When the gap is opened, foreign matter such as dust may enter between the sheet pieces in the sheet-like member. Further, when the gap is opened, the surface of the sheet piece in the sheet-like member is exposed, so that the surface may be damaged. As the amount of foreign matter adhering to the sheet-like member increases, the bright spot of the liquid crystal display device incorporating the sheet-like member increases, so the yield of the liquid crystal display device decreases. In order to prevent a decrease in yield, in the assembly process, it is necessary to restrain the sheet-like member at least at two or more positions on opposite sides of the outer periphery of the sheet-like member. This complicates the handling of the sheet-like member in the assembly process, which complicates the assembly process.

  Moreover, in patent document 2, the sheet-like member is conveyed to the process following the cleaning process by adsorbing the sheet-like member using an adsorption pad in the assembly process. In this case, since only the uppermost sheet piece in the sheet-like member is adsorbed, it is difficult to handle the sheet-like member during conveyance. Furthermore, when the sheet-like member is restrained, it is necessary to consider the restraining position of the sheet piece in order to prevent entry of foreign matters. As described above, the sheet-like member having the structure in which the sheet pieces are joined to each other is not easy to handle in the assembly process.

  Further, the plurality of laminated sheet pieces have a difference in expansion amount due to heat and humidity. For this reason, in a sheet-like member in which the sheet pieces are mutually restrained at multiple points, if there is a heat change or a humidity change, a difference in expansion amount occurs between the sheet pieces, and wrinkles occur in the sheet-like member. The wrinkle of the sheet-like member becomes a problem on the optical characteristics of the sheet-like member.

  Furthermore, patent document 2 has proposed the cleaning technique of the side surface of a sheet-like member. The technique of patent document 2 is the structure rotated while making an adhesion roller contact each of both the two side surfaces which the sheet-like member currently conveyed opposes. Therefore, it is difficult to clean the side surfaces of the entire outer periphery of the sheet-like member cut into a rectangle at once using the technique of Patent Document 2. In particular, it is difficult to clean the side surface orthogonal to the conveying direction of the sheet-like member.

  Furthermore, in the technique of Patent Document 2, when viewed in a virtual plane parallel to the conveyance direction of the sheet-like member, the outer peripheral surface of the adhesive roller and the side surface of the sheet-like member are always in point contact. Therefore, in order to clean all of the one side surface of the sheet-like member, it is necessary to relatively move the side surface of the sheet-like member while the adhesive roller itself rotates, so that cleaning takes time. Furthermore, since the length of the side surface of the sheet-like member becomes longer as the sheet-like member becomes larger, the moving distance of the adhesive roller becomes longer, and the time required for cleaning is further increased. Thereby, when the technique of patent document 2 is used, the throughput of manufacture of a sheet-like member falls.

  Furthermore, in the technique of Patent Document 2, since only the same position in the outer peripheral surface of the adhesive roller is in contact with the side surface of the sheet-like member, if the removed foreign matter accumulates on the outer peripheral surface of the adhesive roller, It is difficult to remove foreign substances. Furthermore, since the adhesive roller is pressed against the side surface of the sheet-like member being conveyed, the stronger the force pressing the side surface is, the more the conveyance of the sheet-like member is affected. The longer the conveyance of the sheet-like member, the longer the time required for removing the foreign matter.

  Moreover, in the technique of Patent Document 2, since the sheet-like member moves between a pair of adhesive rollers, the sheet-like member and the adhesive roller are arranged so that the sheet-like member is in contact with the adhesive roller. It needs to be positioned accurately. Moreover, when the technique of patent document 2 is used for the assembly process of a backlight unit, the sheet-like member is lifted using a jig or the like when the sheet-like member is moved from the cleaning process to the next process. Also in this case, it is necessary to reliably position the jig and the sheet-like member after removing the foreign matter. As described above, when the technique of Patent Document 2 is used, it is necessary to perform the cleaning of the side surface of the sheet-like member and the positioning of the sheet-like member independently of each other. Decreases. As a result, the yield of the sheet-like member tends to decrease.

  In view of the above problems, an object of the present invention is to improve the yield of sheet-like members by reducing the number of steps necessary for manufacturing the sheet-like members while reliably removing foreign matters on the side surfaces of the sheet-like members. It is to provide a sheet-like member cleaning device, a sheet-like member cleaning method, a sheet-like member manufacturing method, and a backlight unit manufacturing method.

The present invention is a sheet-like member cleaning device for cleaning the side surface of the sheet-like member,
Including a foreign matter removing means having a planar removal surface having adhesiveness,
It is a sheet-like member cleaning device, wherein the removal surface is moved in a state substantially parallel to the side surface of the sheet-like member, and the removal surface is brought into contact with the side surface of the sheet-like member.

Further, in the present invention, the foreign matter removing means includes a polygonal column-shaped removing roller,
The removal surface having the adhesiveness is formed on at least one side surface of the removal roller,
The removing roller is provided to be angularly displaceable about a center axis as a rotation center.

Further, in the present invention, the foreign matter removing means comprises a flat foreign matter removing plate,
On at least one surface of the foreign substance removal plate, a removal surface having the adhesiveness is formed,
The foreign matter removing plate is provided so as to be movable in a direction substantially parallel to a side surface of the sheet-like member.

  In the invention, it is preferable that the removal surface of the foreign matter removing means is a surface of an elastic body having adhesiveness.

  According to the present invention, the removal surfaces of the plurality of foreign matter removing means are respectively moved from both sides of the sheet-like member in a direction close to both side surfaces of the sheet-like member, and are simultaneously brought into contact with both side surfaces of the sheet-like member It is characterized by that.

  Further, the present invention is characterized in that the removal surface of the foreign matter removing means is moved so as to reach a predetermined position and is brought into contact with the side surface of the sheet-like member.

The present invention further includes a transfer means having a transfer surface that can come into contact with the removal surface of the foreign matter removing means,
The transfer surface of the transfer unit has higher adhesiveness than the removal surface of the foreign matter removing unit.

In the present invention, the transfer means comprises a cylindrical transfer roller that can be angularly displaced about a central axis as a rotation center.
A transfer surface made of the elastic material having high adhesiveness is formed on the outer peripheral surface of the transfer roller.

Further, the present invention further includes a support base having a mounting portion for mounting the sheet-like member,
The above-mentioned placement part is constituted by a plurality of projections.

Further, the present invention provides a support base having a mounting portion for mounting the sheet-like member;
Gas ejecting means for ejecting gas, and
The mounting portion is formed with a planar mounting surface in which a plurality of holes through which gas can pass is opened,
The gas jetting means is characterized in that gas is supplied to the plurality of holes of the mounting portion and jetted from the opening.

Further, the present invention provides a support base having a mounting portion for mounting the sheet-like member;
Gas suction means for sucking gas,
The mounting portion is formed with a planar mounting surface in which a plurality of holes through which gas can pass is opened,
The gas suction means guides suction force to the plurality of holes of the mounting portion and sucks from the opening.

Further, the present invention provides a support base having a mounting portion for mounting the sheet-like member;
The sheet-like member further includes pressing means for pressing the sheet-like member toward the placement portion on the placement portion of the support base.

  Further, the present invention is characterized in that the pressing means is composed of a flat plate-like member smaller than the sheet-like member, and is movable together with the sheet-like member in a direction substantially parallel to the sheet-like member. .

  In the invention, it is preferable that the sheet-like member is formed by laminating a plurality of sheet pieces.

Furthermore, the present invention is a sheet-like member cleaning method for cleaning the side surface of a sheet-like member using a foreign matter removing means having a planar removal surface having adhesiveness,
In the sheet-like member cleaning method, the removal surface of the foreign matter removing means is moved in a state substantially parallel to the side surface of the sheet-like member and brought into contact with the side surface.

Furthermore, the present invention provides a superposition step of superimposing a plurality of sheet originals on each other,
Punching process of punching the overlapped sheet material into a predetermined shape to form a sheet-like member composed of a plurality of sheet pieces;
A side surface cleaning step of cleaning at least one cut surface which is a side surface of the sheet-like member,
In the sheet-like member manufacturing method, the side surface cleaning step moves the planar removal surface having adhesiveness so as to be in contact with the cut surface of the sheet-like member in a substantially parallel state. .

Furthermore, the present invention provides a superposition step of superimposing a plurality of sheet originals on each other,
A punching step of punching the stacked sheet material into a predetermined shape to form an optical sheet laminate composed of a plurality of sheet pieces;
A side surface cleaning step for cleaning at least one cut surface which is a side surface of the optical sheet laminate;
Incorporating the optical sheet laminate into the structure of the backlight unit,
In the backlight unit manufacturing method, the side surface cleaning step moves the planar removal surface having adhesiveness so as to be in contact with the cut surface of the optical sheet laminate in a substantially parallel state. is there.

  According to the present invention, the sheet-like member cleaning device includes foreign matter removing means having a planar removal surface. The removal surface moves while maintaining a state substantially parallel to the side surface of the sheet-like member, and the removal surface contacts the side surface. Since the removal surface has adhesiveness, when the removal surface is separated from the side surface, the foreign matter on the side surface moves to the removal surface. This removes foreign matter from the side surface.

  As described above, in the present invention, since the flat plate-like removal surface moves and contacts while being substantially parallel to the sheet-like member, the entire removal surface contacts the side surface at a time. As a result, the sheet-like member cleaning device of the present invention can clean the side face quickly and reliably and can simplify the structure as compared with the prior art using a cylindrical adhesive roller.

  In addition, the entire removal surface is pressed against the side surface while the sheet-like member is positioned with respect to the removal surface by the movement and contact of the removal surface so as to push the side surface substantially in parallel. Thus, the configuration for positioning at the time of side surface cleaning can be omitted. Therefore, the sheet-like member cleaning device of the present invention can be simplified in structure as compared with the cleaning device of the prior art, and can be cleaned. The throughput of the process can be improved and the yield of the sheet-like member can be improved.

  Furthermore, it becomes possible to move the sheet-like member to a predetermined position in the sheet-like member cleaning device by the movement and contact of the removal surface so as to push the side surfaces substantially parallel. Thus, since the sheet member positioning step can be combined with the side surface cleaning step of the sheet-like member, the sheet-like member cleaning device of the present invention can improve the throughput of device manufacturing in the manufacturing process of the device including the sheet-like member. Can be improved.

  According to the invention, the foreign matter removing means is realized by a polygonal column-shaped removing roller having a plurality of side surfaces, and the removing surface is formed on at least one side surface of the removing roller. The removal roller is configured to be angularly displaceable about the center axis of the removal roller as a rotation center. As a result, the removal surface can be easily updated, so that the sheet-like member cleaning device of the present invention can remove foreign matters more easily and reliably.

  Furthermore, according to the present invention, the foreign matter removing means is realized by a flat foreign matter removing plate, and the removal surface is formed on at least one surface of the foreign matter removing plate. The foreign matter removing plate is configured to be movable in a direction substantially parallel to the side surface of the sheet-like member. Thereby, since the contact part of the said removal surface can be updated easily, the sheet-like member cleaning apparatus of this invention can remove a foreign material more easily and reliably.

  According to the invention, the removal surface of the foreign matter removing means is made of an elastic surface having adhesiveness. The elastic body is, for example, an adhesive rubber. As a result, the removal surface reliably contacts the entire side surface of the sheet-like member. Therefore, the sheet-like member cleaning device of the present invention more reliably performs the side-face cleaning of the sheet-like member and the positioning of the sheet-like member. It can be carried out.

  According to the invention, the sheet-like member cleaning device includes a plurality of the foreign matter removing means. The plurality of foreign matter removing means bring the removal surfaces into contact with different portions of the side surfaces of the sheet-like member individually and simultaneously. If there are two foreign matter removing means, the respective removal surfaces move from both sides of the sheet-like member toward the both side surfaces of the sheet-like member in a state substantially parallel to the both side surfaces, Simultaneous contact with both side surfaces. Thereby, the sheet-like member cleaning apparatus of the present invention can position the sheet-like member more precisely while cleaning the entire side surface of the sheet-like member more quickly.

  According to the invention, the sheet-like member cleaning device includes at least one foreign matter removing unit, and the removal surface moves so that the removal surface of the foreign matter removing unit reaches a predetermined position in the device. Touch. Thus, the removal surface can align the side surface at the predetermined position while cleaning the side surface. Therefore, the structure of the sheet-like member cleaning device of the present invention can be further simplified.

  According to the invention, the sheet-like member cleaning device further includes transfer means having a transfer surface. The transfer surface is configured to be able to come into contact with the removal surface of the foreign matter removing means, and has higher adhesiveness than the removal surface. Since the transfer surface is more adhesive than the removal surface, if the transfer surface contacts and separates from the removal surface, the foreign matter attached to the removal surface moves to the transfer surface, and the removal surface To be cleaned. As a result, the sheet-like member cleaning device of the present invention can always initialize the removal surface, thereby preventing a reduction in the efficiency of foreign matter removal.

  According to the invention, the transfer means is realized by a cylindrical transfer roller that can be angularly displaced about a central axis as a rotation center. The transfer surface is the outermost peripheral surface of the transfer roller and is formed from the surface of an elastic body having adhesiveness. As a result, the sheet-like member cleaning device of the present invention can reliably initialize the removal surface using a simple configuration, and thus can easily prevent a reduction in the efficiency of removing foreign matter.

  Moreover, according to this invention, the said sheet-like member cleaning apparatus further contains the support stand which has a mounting part. The removal surface of the foreign matter removing means contacts the side surface of the sheet-like member on the mounting portion. The mounting portion is configured by a plurality of protrusions arranged in a plane. The sheet-like member placed on the placement portion is supported by the plurality of protrusions. Therefore, when the side surface of the sheet-like member is cleaned, the friction between the sheet-like member and the support base becomes smaller. Thereby, the sheet-like member cleaning device of the present invention can further reduce the influence of the friction on the positioning of the sheet-like member.

  Moreover, according to this invention, the said sheet-like member cleaning apparatus further contains the support stand which has a mounting part, and the gas ejection means for ejecting gas. The mounting portion is formed with a planar mounting surface having a plurality of holes through which gas can pass. In a state where the sheet-like member is placed on the placement portion, when gas is supplied to the plurality of holes of the placement portion, the gas is ejected from the opening of the placement surface, The sheet-like member floats from the placement portion. Therefore, at the time of side cleaning of the sheet-like member, sliding between the sheet-like member and the mounting portion is eliminated, and friction between the sheet-like member and the support base is further reduced. Thereby, the sheet-like member cleaning device of the present invention can further reduce the influence of the friction on the positioning of the sheet-like member.

  Moreover, according to this invention, the said sheet-like member cleaning apparatus further contains the support stand which has a mounting surface, and the gas suction means for attracting | sucking gas. The mounting portion is formed with a flat mounting surface in which a plurality of holes through which gas can pass are opened. In the state where the sheet-like member is placed on the placement section, when suction force is guided to the plurality of holes of the placement section and gas is sucked from the opening of the placement surface, The sheet-like member is in close contact. Thereby, since the posture of the sheet-like member is prevented from being disturbed during the side surface cleaning, the sheet-like member cleaning device of the present invention can more reliably clean the side surface of the sheet-like member.

  Moreover, according to this invention, the said sheet-like member cleaning apparatus further contains the support stand which has a mounting part, and the pressing means which contacts the said sheet-like member. The said pressing means presses the said sheet-like member toward the mounting part of the said support stand, contacting at least one part of the main surface of the said sheet-like member. Thereby, since the posture of the sheet-like member is not disturbed when the side surface of the sheet-like member is cleaned, the sheet-like member cleaning device of the present invention can more reliably clean the side surface of the sheet-like member.

  According to the invention, the pressing means is a flat member smaller than the sheet-like member. Thereby, the said pressing means does not disturb the behavior of the said removal surface at the time of the said side surface cleaning. The pressing means is configured to be movable together with the sheet-like member in a direction substantially parallel to the sheet-like member. Thereby, the said pressing means does not prevent the movement on the said mounting part of the said sheet-like member at the time of the said side surface cleaning. Therefore, the sheet-like member cleaning device of the present invention can more reliably achieve both side cleaning of the sheet-like member and positioning of the sheet-like member within a single step.

  Moreover, according to this invention, the said sheet-like member is a laminated body comprised by laminating | stacking a some sheet piece. The flat plate-like removal surface of the foreign matter removing means contacts the side surfaces of the plurality of sheet pieces in the sheet-like member at a time. Thereby, the sheet-like member cleaning device of the present invention can position the laminate while cleaning the side surface of the laminate even in the laminate of a plurality of sheet pieces. Furthermore, the sheet-like member cleaning device of the present invention can align the positions of the side surfaces of all the sheet pieces when cleaning the side surfaces of the laminate. Thereby, the sheet-like member cleaning apparatus of the present invention can further simplify the structure of the sheet-like member cleaning apparatus while improving the quality of the laminated sheet-like member.

  Moreover, according to this invention as mentioned above, the sheet-like member cleaning method cleans the side surface of a sheet-like member using the removal surface of a foreign material removal means. The removal surface is planar and has adhesiveness. The removal surface moves while maintaining a state substantially parallel to the side surface, and contacts the side surface, whereby the removal surface contacts the side surface while positioning the sheet-like member and the removal surface. When the removal surface is separated from the side surface after contact, the foreign matter adhering to the side surface moves to the removal surface and is removed, and at the same time, the sheet-like member is positioned at a predetermined position.

  Thus, the sheet-like member cleaning method of the present invention can position the sheet-like member and the removal surface using a side surface cleaning step of the sheet-like member. Moreover, the said sheet-like member cleaning method can also perform positioning of the said sheet-like member itself using the said side surface cleaning process. Thereby, when the sheet-like member cleaning method of the present invention is used, the side surface cleaning process can be simplified, and thus the throughput of the side surface cleaning process can be improved.

  Moreover, according to this invention as mentioned above, the sheet-like member manufacturing method is a method for manufacturing the sheet-like member which is a laminated body of a some sheet piece. In the manufacturing method, first, a plurality of sheet originals are superposed on each other. Subsequently, the sheet-like member is formed by punching the overlapped sheet raw material into a predetermined shape at a time. Finally, the planar removal surface having adhesiveness with respect to the side surface of the sheet-like member is moved substantially in parallel and brought into contact with the side surface, whereby the removal is performed while the side surface and the removal surface are positioned. The surface contacts the side surface and separates. Thereby, the foreign matter on the side surface is removed, and at the same time, the sheet-like member is positioned at a predetermined position.

  Thus, when the sheet-like member manufacturing method of the present invention is used, the side surface cleaning step of the sheet-like member also serves as the positioning step of the sheet-like member. Therefore, since the manufacturing process of the sheet-like member is simplified, the yield of the sheet-like member can be improved. Moreover, since the manufacturing time of the sheet-like member is shortened by the simplification of the manufacturing process, the throughput of the manufacturing process can be improved.

  Moreover, according to this invention as mentioned above, the backlight unit manufacturing method is a method for manufacturing the backlight unit using the optical sheet laminated body which is a sheet-like member which consists of a some sheet piece. In the manufacturing method, first, a plurality of sheet originals are superposed on each other. Next, the optical sheet-like laminate is formed by punching the overlapped sheet originals into a predetermined shape at a time. Next, with respect to the side surface of the optical sheet laminate, the side surface and the removal surface are positioned by moving the planar removal surface having adhesiveness substantially parallel to contact the side surface, The removal surface contacts the side surface at a time and separates. Accordingly, the optical sheet laminate is positioned at a predetermined position while removing the foreign matter on the side surface. Finally, the optical sheet laminate is moved using a jig for an assembling process, and the optical sheet laminate is incorporated into the structure of the backlight unit.

  Thus, when the backlight unit manufacturing method of this invention is used, the side surface cleaning process of the said sheet-like member serves as the positioning process regarding the next process of the said sheet-like member. Therefore, since the manufacturing process of the backlight unit is simplified, the yield of the backlight unit can be improved. Further, since the manufacturing time of the backlight unit is shortened by the simplification of the manufacturing process, the throughput of the manufacturing process can be improved.

  FIG. 1 is a schematic diagram for explaining a configuration of a sheet-like member cleaning device 1 according to the first embodiment of the present invention. The sheet-like member cleaning device 1 includes at least one foreign matter removing unit 4, and more preferably includes a moving unit 5, a transfer unit 6, a support base 7, a pressing unit 8, and a pressing drive unit 9. In FIG. 1, the sheet-like member 2 is a sheet-like substantially rectangular member. The sheet-like member cleaning device 1 cleans the side surface 12 of the sheet-like member 2.

  The foreign matter removing unit 4 has at least one planar removal surface 11 having adhesiveness. The moving unit 5 moves the removal surface 11 relative to the sheet-like member 2 so that the removal surface 11 contacts and separates from the side surface 12 of the sheet-like member 2. Specifically, the removal surface 11 of the foreign substance removal unit 4 moves while maintaining a state substantially parallel to the side surface 12 of the sheet-like member 2, and the removal surface 11 contacts the side surface 12. Since the removal surface 11 has adhesiveness, when the removal surface 11 is separated from the side surface 12, the foreign matter 28 attached to the side surface 12 moves to the removal surface 11. Thereby, the foreign material 28 is removed from the side surface 12 of the sheet-like member 2. The moving unit 5 may move at least one of the sheet-like member 2 and the removal surface 11. In the first embodiment, the removal surface 11 can be contacted / separated by moving the entire foreign substance removal unit 4.

  As described above, in the sheet-like member cleaning apparatus 1 according to the first embodiment, the planar removal surface 11 moves so as to be substantially parallel to the side surface 12 of the sheet-like member 2. It contacts the side surface 12 of the shaped member 2 at a time. In other words, the conventional cleaning device using the cylindrical adhesive roller makes the curved removal surface contact the flat side surface with a line, whereas the sheet-like member cleaning device 1 of the first embodiment has a flat shape. The removal surface 11 is brought into surface contact with the planar side surface 12. Accordingly, the sheet-like member cleaning device 1 in FIG. 1 can clean the side surface 12 of the sheet-like member 2 quickly and reliably as compared with the conventional cleaning device. In addition, since the foreign matter 28 is removed by a simple operation of merely bringing the planar removal surface 11 into contact with or separating from the side surface 12 of the sheet-like member 2, the sheet-like member cleaning device of FIG. 1 is compared with the conventional cleaning device. 1 can simplify the structure.

  Further, in the sheet-like member cleaning device 1, even if the side surface 12 of the sheet-like member 2 is slightly shifted from the position parallel to the removal surface 11, the removal surface 11 moves so as to push the side surface 12 substantially in parallel. The entire removal surface 11 can be brought into contact with the side surface 12 while positioning the sheet-like member 2 and the removal surface 11 by the contact operation. Thereby, in the sheet-like member cleaning apparatus 1, it is not necessary to precisely position the sheet-like member 2 and the removal surface 11 in advance. Therefore, the sheet-like member cleaning device 1 according to the first embodiment can be simplified in structure as compared with the conventional cleaning device, and can improve the throughput of the side surface cleaning process to improve the yield of the sheet-like member 2. Can be improved.

  Furthermore, the sheet-like member cleaning device 1 is moved to a predetermined position in the sheet-like member cleaning device 1 by an operation in which the removal surface 11 moves and contacts the side surface 12 of the sheet-like member 2 in a substantially parallel state. The member 2 can be moved. Thereby, when the sheet-like member cleaning apparatus 1 is incorporated in the manufacturing process of the apparatus including the sheet-like member 2, the sheet-like member 2 with respect to the jig used for the transition from the side surface cleaning step to the next step of the sheet-like member 2 The positioning step can be combined with the side surface cleaning step. Therefore, the throughput of device manufacturing in the manufacturing process can be improved.

  The sheet-like member 2 is realized by, for example, a laminated body in which a plurality of sheet pieces are laminated with each other. As a specific example, the sheet-like member 2 is realized by an optical sheet laminate in which a plurality of sheet pieces each having optical characteristics are laminated on each other, and is used as a backlight unit of a transmissive liquid crystal display device. Used. Further, the sheet-like member 2 may be realized by a single sheet piece.

  When the sheet-like member 2 is the above-described laminate, in the sheet-like member cleaning device 1, the flat plate-like removal surface 11 simultaneously contacts the side surfaces of the plurality of sheet pieces in the sheet-like member 2. Therefore, the sheet-like member cleaning device 1 can position the entire sheet piece while simultaneously cleaning the side surfaces of the plurality of sheet pieces. Thereby, the sheet-like member cleaning apparatus 1 can position the laminated body while cleaning the side surface of the laminated body even in the laminated body of a plurality of sheet pieces.

  Further, when the plurality of sheet pieces are not joined to each other, when the removal surface 11 moves in a state substantially parallel to the side surfaces of the plurality of sheet pieces and contacts the side surfaces at the same time, the positions of the side surfaces of the sheet pieces are Even if they deviate from each other, the positions of the side surfaces of all the sheet pieces can be aligned with each other while cleaning the side surfaces. Thereby, the sheet-like member cleaning apparatus 1 can prevent unevenness of the unjoined sheet pieces in the laminated body using a simple configuration of the side surface cleaning process. Therefore, the sheet-like member cleaning device 1 can achieve both improvement in the quality of the sheet-like member after the side surface cleaning and further simplification of the structure of the sheet-like member cleaning device 1.

  Preferably, the sheet-like member cleaning device 1 includes a plurality of foreign matter removing units 4. The plurality of foreign matter removing portions 4 are individually and simultaneously brought into contact with different portions of the entire side surface 12 of the sheet-like member 2. Thereby, the sheet-like member cleaning apparatus 1 can perform the positioning of the sheet-like member 2 more precisely while cleaning the entire side surface 12 of the sheet-like member 2 more quickly.

  For example, if there are two foreign matter removal portions 4, the removal surfaces 11 of the two foreign matter removal portions 4 are preferably arranged so as to sandwich the substantially rectangular sheet-like member 2, and the sheets are formed from both sides of the sheet-like member 2. Each removal surface 11 moves in a direction close to both side surfaces 12 of the sheet-like member 2 in a state of being substantially parallel to the both side surfaces 12, and each removal surface 11 is placed on the two side surfaces 12 of the sheet-like member 2 facing each other. Touch at the same time. Further, each removal surface 11 is substantially parallel to the two side surfaces 12 perpendicular to each other in the direction approaching the two side surfaces 12 of the substantially rectangular sheet-shaped member 2 from the outside of the sheet-like member 2. And the removal surfaces 11 may simultaneously contact the side surfaces 12 of the two orthogonal sides. More preferably, if there are four foreign substance removal portions 4, the removal surfaces 11 move in parallel with each other and simultaneously come into contact with the four side surfaces 12 of the sheet-like member 2. As the number of the foreign matter removing portions 4 increases, both the side cleaning speed and the positioning accuracy are improved.

  Further, when at least one foreign matter removing unit 4 is included, even if the removal surface 11 moves and contacts so that the removal surface 11 of the foreign matter removing unit 4 reaches a predetermined positioning position in the sheet-like member cleaning device 2. Good. Thus, if the side surface 12 of the sheet-like member 2 is closer to the position of the standby removal surface 11 than the positioning position, the removal surface 11 can align the side surface 12 with the positioning position while cleaning the side surface 12. it can. Therefore, the sheet-like member cleaning device 1 according to the first embodiment can further simplify the configuration for performing the side surface cleaning of the sheet-like member 2 and the positioning of the sheet-like member 2.

  A specific configuration of the sheet-like member cleaning device 1 will be described below. In the following description, the “vertical direction” is a direction in which gravity acts. In the following description, the vertical direction and the direction in which gravity acts may be referred to as “down”, and the vertical direction opposite to the downward direction may be referred to as “up”. In the following description, a plane whose normal direction is the vertical direction may be referred to as a “horizontal plane”, and a direction parallel to the horizontal plane may be referred to as a “horizontal direction”. In the first embodiment, two foreign matter removing units 4 are prepared and realized by the removing roller 14. The transfer unit 6 is prepared for each foreign matter removing unit 4 and is realized by a transfer roller 15.

  The removal roller 14 is a polygonal columnar member having a plurality of side surfaces, and is provided such that it can be angularly displaced about an axis parallel to the central axis of the removal roller 14 itself. The removal surface 11 is formed on at least one of the plurality of side surfaces of the removal roller 14. As a result, the foreign substance removal unit 4 can have a plurality of removal surfaces 11.

  When the foreign matter removing unit 4 has a plurality of removal surfaces 11, one of the plurality of removal surfaces 11 is selected and contacts the side surface 12 of the sheet-like member 2 in one side cleaning process. That is, if there are a plurality of removal surfaces 11, when the side surface cleaning process is continuously performed a plurality of times, the contact removal surfaces 11 can be sequentially switched and updated. Therefore, when the side surface cleaning process is continuously performed, only the single removal surface 11 comes into contact with the side surface 12 and the removed foreign material 28 is prevented from accumulating on the removal surface 11. Easy and reliable.

  When the removal roller 14 is formed in a polygonal column shape, the removal roller 14 is easier to use if the removal roller 14 can be angularly displaced about an axis parallel to the central axis of the removal roller 14 as a rotation center. This is because the removal surface 11 is switched simply by angularly displacing the removal roller 14 around the center of rotation, so that the removal surface 11 can be easily updated.

  In FIG. 1, the removal roller 14 is realized by a regular octagonal columnar member whose cross section perpendicular to the rotation center is a regular octagon. Of course, the removal roller 14 may be realized by a polygonal column having more or less side surfaces than a regular octagonal column, or a polygonal column whose cross section is not a regular polygon, in addition to a regular octagonal columnar member. May be. More preferably, the removal roller 14 is realized by a regular polygonal column-shaped member whose cross section perpendicular to the rotation center is a regular polygon, and the rotation center coincides with the central axis of the regular polygonal column. In this case, even if the removal roller 14 is angularly displaced around the rotation center, the positional relationship between the rotation center and the surface that contacts the side surface 12 of the plurality of removal surfaces 11 does not change, and thus handling is easy. Further, when there is a surface that is not used as the removal surface 11 among the plurality of side surfaces of the removal roller 14, the unused surface is not brought into contact with the side surface of the sheet-like member 2. It does not have to be sticky.

  The removal surface 11 of the removal roller 14 is made of an elastic surface having adhesiveness. The elastic body is, for example, an adhesive rubber, and is specifically realized by silicon rubber or butyl rubber. Thus, since the removal surface 11 has elasticity, the removal surface 11 reliably contacts the entire side surface 12 of the sheet-like member 2. Thereby, the sheet-like member cleaning apparatus 1 can perform the side surface cleaning of the sheet-like member 2 and the positioning of the sheet-like member 2 more reliably.

  The transfer unit 6 has a transfer surface 16 having adhesiveness. The transfer surface 16 is configured to be movable relative to the removal surface 11 so that the transfer surface 16 and the removal surface 11 can be contacted and separated. Compared to the removal surface 11, the transfer surface 16 has higher adhesiveness. Therefore, when the transfer surface 16 is separated from the removal surface 11, the foreign matter 28 attached to the removal surface 11 moves to the transfer surface 16. As a result, the foreign matter 28 is removed from the removal surface 11 and the removal surface 11 is initialized. Therefore, the sheet-like member cleaning device 1 can always bring the fresh removal surface 11 free from foreign matters into contact with the side surface 12 of the sheet-like member 2. Therefore, the removed foreign matter 28 is more reliably prevented from accumulating on the removal surface 11, and the efficiency of removing the foreign matter is prevented.

  More preferably, as shown in FIG. 1, the transfer unit 6 is realized by a transfer roller 15 that is a cylindrical member, and the transfer surface 16 is formed on the outermost peripheral surface that is the side surface of the transfer roller 15. The transfer roller 15 is configured to be angularly displaceable about the center axis of the transfer roller 15 itself as a rotation center. The rotation centers of the transfer roller 15 are arranged in parallel to the rotation center of the removal roller 14. The rotation center of the transfer roller 15 is separated from the rotation center of the removal roller 14 by a distance that allows the removal surface 11 and the transfer surface 16 to be in contact with each other at least at one part.

  In FIG. 1, when the transfer roller 15 is angularly displaced about its own rotation center, the removal surface 11 and the transfer surface 16 are in contact with each other at least at one portion, and the contact portion between the removal surface 11 and the transfer surface 16 is sequentially shifted. Go. Since the transfer surface 16 has a stronger adhesive force than the removal surface 11, the foreign matter 28 adhering to the removal surface 11 is transferred to the transfer surface 16 and does not return to the removal surface 11. As a result, the foreign matter 28 on the removal surface 11 of the removal roller 14 moves to the transfer surface 16 of the transfer roller 15. Therefore, the sheet-like member cleaning device 1 always adds a simple configuration such as the transfer roller 15 to always bring the removal roller 14 in the initial state without the foreign substance 28 on the surface thereof into contact with the side surface 12 of the sheet-like member 2. The foreign matter 28 can be removed. Since there is no foreign material 28 or more generated by the punching of the sheet-like member 2 between the removing roller 14 and the side face 12 of the sheet-like member 2, the side face 12 of the sheet-like member 2 is not damaged.

  More preferably, the transfer surface 16 is formed from a surface of an elastic body having higher adhesiveness than the removal surface 11 of the removal roller 14. When both the removal surface 11 and the transfer surface 16 have elasticity, even if the transfer roller 15 has a circular cross section and the removal roller 14 has a polygonal cross section, the removal surface 11 and the transfer surface 16 are at least one part. The transfer roller 15 and the removal roller 14 can each be angularly displaced while maintaining the contact state. As a result, the transfer roller 15 can more reliably remove the foreign matter 28 on the removal surface 11 using a very simple configuration.

  The support base 7 has a mounting portion 18 for mounting the sheet-like member 2 that is an object to be processed. The removal surface 11 of the removal roller 14 contacts the side surface 12 of the sheet-like member 2 placed on the placement unit 18. In FIG. 1, the placement unit 18 includes a plurality of minute protrusions 19 arranged on a plane. One main surface 21 of the sheet-like member 2 placed on the placement portion 18 is supported by a plurality of protrusions 19. One main surface 21 of the sheet-like member 2 is a main surface on the placement portion 18 side of the two main surfaces of the sheet-like member 2, and is the lower main surface of the sheet-like member 2 in FIG. 1.

  When the sheet-like member 2 is positioned along with the side surface cleaning, the sheet-like member 2 on the placement portion 18 is pushed by the removal surface 11 and moves, so that the sheet-like member 2 and the placement portion 18 slide. By configuring the mounting portion 18 with a large number of minute protrusions 19, the sheet-like member cleaning device 1 can minimize the influence of the sliding. Specifically, when the sheet-like member 2 on the support base 7 is moved, the one principal surface 21 has a plurality of protrusions 19 as compared with a configuration in which the one principal surface 21 of the sheet-like member is in direct contact with a flat surface having no protrusions. In the configuration supported by, the friction between the sheet-like member 2 and the support base 7 becomes smaller. Thereby, the sheet-like member cleaning device 1 of FIG. 1 can further reduce the influence of the friction on the positioning of the sheet-like member 2 as compared with the prior art.

  The pressing portion 8 contacts at least a part of the other main surface 22 of the sheet-like member 2. The other main surface 22 of the sheet-like member 2 is the upper main surface of the sheet-like member 2 in FIG. The pressing portion 8 presses the sheet-like member 2 toward the mounting portion 18 of the support base while being in contact with the other main surface 22 of the sheet-like member 2. Therefore, when the removal surface 11 is pressed against the sheet-like member 2 on the placement portion 18, the posture of the sheet-like member 2 is not disturbed. Thereby, the sheet-like member cleaning apparatus 1 can more reliably clean the side surface 12 of the sheet-like member 2.

  Preferably, the pressing portion 8 is realized by a flat plate-like member that is smaller than the sheet-like member 2. As a result, in a state in which the posture of the sheet-like member 2 on the support base 7 is maintained, the foreign matter removing unit 4 reliably attaches the removal surface 11 to the side surface 12 of the sheet-like member 2 without being obstructed by the pressing unit 8. Can be contacted. Therefore, the sheet-like member cleaning device 1 can achieve both the side cleaning of the sheet-like member 2 and the positioning of the sheet-like member 2 more reliably and simultaneously.

  More preferably, the pressing portion 8 is configured to be movable together with the sheet-like member 2 in a direction substantially parallel to the sheet-like member 2. Thereby, when the removal surface 11 contacts the side surface 12, the pressing portion 8 does not hinder the movement of the sheet-like member 2 on the placement portion 18. Therefore, the sheet-like member cleaning apparatus 1 can achieve both the side surface cleaning of the sheet-like member 2 and the positioning of the sheet-like member 2 more reliably.

  Specifically, in FIG. 1, the pressing portion 8 is realized by a flat plate-like member that is slightly smaller than the other main surface 22 of the sheet-like member 2. The pressing part 8 is supported and positioned by the pressing drive part 9. A hollow press receiving portion 24 is formed inside the flat pressing portion 8. An opening 25 of the press receiving portion 24 is opened on the other main surface 22 of the press portion 8. In the horizontal direction that is substantially parallel to the other main surface 22 of the sheet-like member 2, the width of the opening 25 is narrower than the width of the internal space of the press receiving portion 24.

  The pressing drive unit 9 includes an interference unit 26 and a support rod 27. The interference part 26 is disposed inside the press receiving part 24. Since the interference portion 26 is smaller than the inner space of the press receiving portion 24, there is a space for play between the press receiving portion 24 and the interference portion 26. The support rod 27 is fixed to a part of the interference portion 26, and the interference portion 26 moves integrally with the support rod 27. The support rod 27 extends through the opening 25 and out of the press receiving portion 24. In FIG. 1, the lower end of the support rod 27 is fixed substantially at the center of the upper main surface of the flat interference portion 26. In the horizontal direction, the width of the interference part 26 is narrower than the width of the internal space of the press receiving part 24, the width of the opening 25 is narrower than the width of the interference part 26, and compared with the width of the opening 25. Thus, the diameter of the support bar 54 is narrow. With such a configuration, when the support bar 54 is moved up and down along the vertical direction, the pressing portion 8 comes into contact with the other main surface 22 of the sheet-like member 2 in a separated manner.

  In a standby state in which the pressing portion 8 is waiting above the other main surface 22 of the sheet-like member 2, the inner wall of the pressing receiving portion 24 comes into contact with the upper main surface of the interference portion 26. The part 26 interferes. For this reason, in the standby state, the pressing portion 8 is supported in a form suspended from the pressing drive portion 9. When the pressing drive unit 9 moves in the sky, the pressing unit 8 moves with the movement. When the pressing drive unit 9 moves to a position below the standby state position, the pressing unit 8 comes into contact with and is placed on the other main surface 22 of the sheet-like member 2. As a result, the pressing portion 8 is positioned and placed on the sheet-like member 2. In the mounting state in which the pressing portion 8 is mounted on the other main surface 22 of the sheet-like member 2, the pressing portion 8 presses the sheet-like member 2 against the mounting portion 18 of the support base 7 due to its own weight. To do.

  As a result, even when the sheet-like member 2 is warped due to curling or the like, the sheet-like member 2 is always held in a flat posture on the support base 7. Therefore, the sheet-like member cleaning device 1 can always more reliably clean the side surface 12 of the sheet-like member 2. This also allows the sheet-like member cleaning device 1 to reduce the probability that foreign matter is mixed between the sheet pieces due to the opening between the sheet pieces inside the sheet-like member 2 when the sheet-like member 2 is positioned. Therefore, the sheet-like member cleaning device 1 can improve the yield of the sheet-like member 2.

  Preferably, the interference portion 26 is separated from the inner wall of the presser receiving portion 24 under the above-described placement state. Since there is a play space between the press receiving portion 24 and the interference portion 26, the press receiving portion 24 does not interfere with the interference portion 26 while the press portion 8 presses the sheet-like member 2 on the support base 7. Is possible. Thereby, at the time of positioning of the sheet-like member 2 accompanying the side surface cleaning, it becomes easy for the sheet-like member 2 and the pressing portion 8 to move integrally. Therefore, it is prevented that the press part 8 prevents positioning of the sheet-like member 2 accompanying side surface cleaning.

  In the sheet-like member cleaning device 1 of FIG. 1, the pressing portion 8 and the pressing drive portion 9 are not necessarily required and can be omitted. If the pressing unit 8 and the pressing drive unit 9 are omitted, the configuration of the sheet-like member cleaning device 1 is simplified. Therefore, the side surface cleaning process of the sheet-like member 2 is simplified, and the throughput of the side surface cleaning process is increased. improves.

  FIG. 2 is a schematic diagram for explaining a procedure for cleaning the side surface of the sheet-like member 2 by the sheet-like member cleaning device 1 of FIG. The detailed operation of the sheet-like member cleaning device 1 will be described below with reference to FIG.

  First, as shown in FIG. 2A, the sheet-like member 2 is mounted on the mounting portion 18 of the support base 7. A foreign substance 28 is attached to the side surface 12 of the sheet-like member 2. At the time of FIG. 2A, the removal surface 11 to be used of the removal roller 14 is retracted to an initial position farther from the side surface 12 of the sheet-like member 2 than the predetermined positioning position 29.

  Next, as shown in FIG. 2B, the pressing portion 8 is placed on the main surface 22 above the sheet-like member 2 by the pressing drive portion 9. As a result, the sheet-like member 2 is gripped by the support base 7 and the pressing portion 8. Between FIG. 2B and FIG. 2E, the pressing drive unit 9 does not interfere with the pressing unit 8 and maintains the state in which the pressing unit 8 can move together with the sheet-like member 2.

  Then, as shown in FIG. 2 (c), the removal surface 11 in use maintains the posture substantially parallel to the side surface 12 of the sheet-like member 2, so that the removal surface 11 reaches the positioning position 29. The removal roller 14 is moved by the moving unit 5. As a result, the removal surface 11 in use of the removal roller 14 contacts the side surface 12 of the sheet-like member 2, and the removal surface 11 in use moves the side surface 12 of the sheet-like member 2 to the positioning position 29. At this time, since the sheet-like member 2 is supported by the minute protrusions 19 on the surface of the support base 7 and the pressing member 8 is provided on the upper part of the sheet-like member 2, the removal surface 11 of the removal roller 14 is pressed. The sheet-like member 2 can be positioned. If there are a plurality of removal rollers 14, the plurality of removal rollers 14 move to the positioning positions 29 set for each of the removal rollers 14. The movement of the removal roller 14 may be simultaneous or sequential.

  Next, as shown in FIG. 2 (d), the removal roller 14 is separated from the side surface 12 of the sheet-like member 2 by the moving unit 5, and returns to the initial position. At this time, the foreign matter 28 attached to the side surface 12 of the sheet-like member 2 moves to the removal surface 11 of the removal roller 14, and the foreign matter 28 is removed from the side surface 12 of the sheet-like member 2.

  Then, as shown in FIG. 2E, the removal roller 14 and the transfer roller 15 are angularly displaced, and the used removal surface 11 of the removal roller is moved to the contact point with the transfer roller 15. Along with the angular displacement, the foreign matter 28 moves to the contact portion between the removal roller 14 and the transfer roller 15. At the same time, the new removal surface 11 moves to the initial position and waits. In order to quickly move the foreign matter 28 to the contact portion, the angular displacement direction of the removal roller 14 is preferably opposite to the angular displacement direction of the transfer roller 15.

  Finally, as shown in FIG. 2F, only the transfer roller 15 is further angularly displaced. The foreign matter 28 on the removal surface 11 of the removal roller 14 moves to the transfer roller 15 side due to the difference in adhesive force between the rollers 14 and 15. The foreign matter 28 once adhered to the transfer roller 15 does not return to the removal roller 14 side due to the difference in the adhesive force. As a result, the foreign matter is removed from the used removal surface 11 and the removal surface is refreshed. Furthermore, since the new removal surface 11 is waiting at the initial position, preparation for the next side surface cleaning of the sheet-like member 2 is also made.

  In FIG. 2 (f), the pressing portion 8 is lifted by the pressing drive portion 9 and removed from the sheet-like member 2. As a result, the sheet-like member 2 is placed at the positioning position 29 on the support base 7. Thereafter, the sheet-like member 2 is carried from the support base 7 to the next process.

  By repeating the operations of FIGS. 2A to 2F, the foreign matter 28 attached to the side surface 12 of the sheet-like member 2 is removed and moved to the transfer surface 16 of the transfer roller 15. Since all the foreign matter 28 collects on the transfer roller 15, it is not necessary to clean the removal roller 14 itself, and the transfer roller 15 may be periodically cleaned.

  As described above, since the sheet-like member 2 is held by the support base 7 and the pressing portion 8, the sheet-like member cleaning device 1 maintains the rigidity of the end portion of the sheet-like member 2 at a high level. Can be supported. Since the flat removal surface 11 of the removal roller 14 is in contact with the side surface 12 of the sheet-like member 2 kept highly rigid, the sheet-like member cleaning device 1 performs positioning while removing foreign matter. It becomes possible.

  The sheet-like member cleaning device 2 in FIG. 1 is used, for example, in the manufacturing process of the sheet-like member 2 that is a laminate of a plurality of sheet pieces. The manufacturing process of the laminated sheet-like member 2 basically includes three processes: a polymerization process, a punching process, and a side surface cleaning process. First, in the superposition process which is the first process, a plurality of original sheets are superposed on each other. Next, in the punching process, which is the second process, the stacked sheet material is punched into a predetermined shape at a time, whereby the laminated sheet-like member 2 is formed. The formed side surface 12 of the sheet-like member 2 corresponds to a cut surface cut from the original sheet in the punching process, and foreign matter 28 is likely to adhere to the side surface 12. Finally, in the side surface cleaning step that is the third step, the sheet-like member cleaning device 1 of FIG. 1 is used. That is, the side surface 12 is positioned with respect to the removal surface 11 by moving and contacting the flat removal surface 11 having adhesiveness with the side surface 12 of the sheet-like member 2 while maintaining a substantially parallel state. However, the removal surface 11 contacts the side surface 12 at once. If the removal surface 11 leaves | separates from the side surface 12 after a contact, the foreign material 28 adhering to the side surface 12 will be removed by moving to the removal surface 11, and the sheet-like member 2 will be positioned in a predetermined position simultaneously.

  In such a sheet-like member manufacturing process, the side cleaning of the sheet-like member 2 and the positioning of the sheet-like member 2 can be performed simultaneously in a single process. Therefore, since an independent positioning process can be omitted, the manufacturing process of the sheet-like member 2 is simplified. This facilitates the handling of the sheet-like member 2 in the manufacturing process and reduces the chance of the sheet-like member 2 being damaged, so that the yield of the sheet-like member 2 can be improved. Moreover, since the manufacturing time of the sheet-like member 2 can be shortened by simplifying the manufacturing process, the throughput of the manufacturing process can be improved.

  Moreover, the laminated sheet-like member 2 described above is realized by, for example, an optical sheet laminated body including a plurality of sheet pieces each having optical characteristics. That is, the sheet-like member cleaning device 1 of FIG. 1 is used in a backlight unit manufacturing process for manufacturing a backlight unit using an optical sheet laminate. The manufacturing process of the backlight unit basically includes four processes: a superposition process, a punching process, a side surface cleaning process, and an assembling process.

  In the manufacturing process, first, in a superposition process which is a first process, a plurality of sheet raw materials are superposed on each other. Next, in the punching process which is the second process, the optical sheet-like laminate is formed by punching the overlapped sheet raw material into a predetermined shape at a time. Next, in the side surface cleaning step, which is the third step, the cut surface of the optical sheet laminate is cleaned using the sheet-like member cleaning device 1 of FIG. Finally, in the assembling process as the fourth process, the optical sheet laminate is assembled into the structure of the backlight unit.

  Specifically, in the side surface cleaning step, the planar removal surface 11 having adhesiveness with respect to the cut surface that is the side surface of the optical sheet laminate moves while maintaining a substantially parallel state to the cut surface. By contacting, the cut surface and the removal surface 11 are positioned, and the removal surface 11 contacts the cut surface at a time. When the removal surface 11 is separated from the cut surface after contact, the foreign matter 28 adhering to the cut surface moves to the removal surface 11 and is removed, and at the same time, the optical sheet laminate is positioned at a predetermined position. The optical sheet laminated body after positioning is moved using a jig for an assembling process and incorporated into the structure.

  In the manufacturing process of such a backlight unit, cleaning of the cut surface of the optical sheet laminate and positioning of the optical sheet laminate relative to the jig can be performed simultaneously in a single process. Therefore, since the manufacturing process of the backlight unit is simplified, the handling of the optical sheet laminate is facilitated, and the chance of damage to the optical sheet laminate can be reduced. Therefore, the yield of the backlight unit can be improved. Moreover, since the manufacturing time of the optical sheet laminate can be shortened by simplifying the manufacturing process, the throughput of the entire manufacturing process of the backlight unit can be improved.

FIG. 3 is an exploded perspective view showing a detailed configuration of the backlight unit 31 manufactured in the above-described manufacturing process. In addition to the sheet-like member 2 that is an optical sheet laminate, the backlight unit 31 includes a sub assembly (assembly;
assembly) 33 and a protective RIM (rim) sheet 34. The sub assembly 33 includes a frame 36, a light guide plate 37, a reflection sheet 38, and an FPC (flexible printed circuit board;
Flexible printed circuits (39) and light source LED (Light Emitting Diode; Light)
Emitting Diode) 40 is included. In FIG. 3, the sheet-like member 2 is a laminate of four sheet pieces, a first sheet piece 41 to a fourth sheet piece 44. In the description of FIG. 3, with reference to the front and back main surfaces of the light guide plate 37, one upper main surface side in FIG. 3 is referred to as “front surface side” and the other main surface side is referred to as “back surface side”.

  A light guide plate 37 is incorporated in a frame 36 that is a substantially rectangular frame. A reflection sheet 38 and an FPC 39 are attached to the back side of the light guide plate 37. One or more LEDs 40 are mounted on the FPC 39. The light guide plate 37, the reflection sheet 38, and the FPC 39 are arranged so that light of the LED 40 is irradiated from at least the surface of the light guide plate 37 through the light guide plate 37. The sheet-like member 2 is mounted on the surface side in the sub assembly 33. By sandwiching the sheet-like member 2 between the RIM sheet 34 and the sub-Assy 33, the RIM sheet 34 fixes the sheet-like member 2 on the sub-Assy 33.

  In the sheet-like member 2 in FIG. 3, for example, the first sheet piece 41 is an upper diffusion sheet, the second sheet piece 42 is an upper prism sheet, the third sheet piece 43 is a lower prism sheet, and the fourth sheet piece 44 is a lower diffusion sheet. Realized with a sheet. The diffusion sheets that realize the first sheet piece 41 and the fourth sheet piece 44 each have a predetermined light diffusion performance. Each of the diffusion sheets has a configuration in which beads are fixed to the surface of the base sheet using a binder. Usually, the diffusion sheet of the first sheet piece 41 and the diffusion sheet of the fourth sheet piece 44 are different from each other in the diameter of the beads used, that is, the average particle diameter of each fixed bead. Performance is also different from each other. The prism sheet that realizes the second sheet piece 42 and the third sheet piece 43 is a lens sheet in which a large number of prisms are adjacent to the surface of the base sheet and arranged on the substantially entire surface. The prism in the prism sheet is a convex lens formed in a uniaxial direction on the surface of the base sheet. For example, each prism is formed with a pitch of 24 μm, a concavo-convex height of 12 μm, and a vertex angle of a convex portion of 90 degrees. In the prism sheet of the second sheet piece and the prism sheet of the third sheet piece 43, the axial directions of the prisms on the respective base sheets are orthogonal to each other.

  FIG. 4 is a schematic diagram showing a specific configuration of the manufacturing apparatus of the backlight unit 31 of FIG. The manufacturing process of the backlight unit 31 will be described with reference to FIG. In FIG. 4, the manufacturing process of the backlight unit 31 proceeds in the direction of the arrow 46 in FIG. The example shown in FIG. 4 is an example in which the sheet-like member 2 is a laminate of four sheet pieces.

  The manufacturing process of FIG. 4 includes the superposition process, the punching process, the side surface cleaning process, and the assembling process described above. For the superposition process, a supply unit 51, raw fabric cleaning units 52a to 52e, and a superposition unit 53 are prepared. For the punching process, a cutting part 54, a flat surface cleaning part 55, and an extraction part 57 are prepared. A side surface cleaning process is implement | achieved by the sheet-like member cleaning apparatus 1 of FIG. For the assembling process, a moving mechanism 56, a sub-Assy assembling unit 60, a RIM sheet pasting unit 61, and a conveyer 59 are prepared.

  In the supply unit 51, the same number of sheet fabrics 62 a to 62 d as the sheet pieces 41 to 44 in the sheet-like member 2 in the backlight unit 31 to be manufactured and the blade contact sheet 63 are prepared in advance. The 1st-4th sheet original fabrics 62a-62d are strip | belt-shaped original fabrics, are each wound by roll shape, and are prepared as the 1st-4th original fabric rolls 64a-64d. The blade contact sheet 63 is a belt-like sheet, and is prepared as a sheet roll 65 wound in a roll shape. Furthermore, the number of the original fabric cleaning parts 52a to 52e is prepared by one more than the number of the sheet pieces 41 to 44. In FIG. 4, four types of sheet original fabrics 62 are prepared, and five original fabric cleaning sections 52 are prepared.

  In the following description, when the sheet original fabrics 62a to 62d are individually identified and described, “first sheet original fabric 62a”, “second sheet original fabric 62b”, “third sheet original fabric 62c”, They are called “fourth sheet original fabric 62d”, and when any one of the unspecified sheet original fabrics is described, the subscripts a to d are omitted and called “sheet original fabric 62”. Similarly, in the following description, when individually identifying a plurality of original fabric cleaning units 52, prefixes “1” to “fifth” and subscripts “a” to “e” are added and unspecified. When describing any one of the original fabric cleaning parts, the suffixes a to e and the prefix are omitted. Furthermore, in the following description, when individually identifying a plurality of original fabric rolls 64, prefixes “1” to “4” and subscripts “a” to “d” are attached, When describing one original fabric roll, the subscripts a to d and the prefix are omitted.

  The supply unit 51 pulls out the sheet original fabric 62 from each of the original fabric rolls 64 and also extracts the blade contact sheet 63 from the sheet roll 65 and supplies them to the first to fifth original fabric cleaning units 52a to 52e, respectively. The 1st-5th original fabric cleaning parts 52a-52e clean the main surface of the front and back of supplied 1st-4th sheet original fabrics 62a-62d and blade contact sheet 63, and remove a foreign material. The overlapping portion 53 sequentially stacks the first sheet original fabric 62a to the fourth sheet original fabric 62d after the main surface cleaning on the blade contact sheet 63 after the main surface cleaning, and these four layers of the sheet original fabric 62a. ˜62d are fixed to each other to form a laminate of all the sheet original fabrics 62a to 62d.

  The cutting part 54 cuts out the sheet-like member 2 which is a laminated body of the first sheet piece 41 to the fourth sheet piece 44 from the laminated body of all the sheet original fabrics 62a to 62d. As a result of cutting, the laminated body of all the sheet original fabrics 62a to 62d is separated into the sheet-like member 2 and the punched end material 66, and proceeds to the next process while maintaining the band shape. After passing through the cutting portion 54, the flat surface cleaning portion 55 cleans the upper main surface of the sheet-like member 2 and the punched end material 66. The take-out part 57 separates the sheet-like member 2 from the punched end material 66 and takes out the sheet-like member 2. The moving mechanism 56 grips the extracted sheet-like member 2 using a gripping hand 58. Further, the moving mechanism 56 sequentially moves the sheet-like member 2 using the gripping hand 58 among the take-out portion 57, the sheet-like member cleaning device 1, and the sub assembly assembly portion 60.

  The sheet-like member cleaning device 1 positions the sheet-like member 2 while cleaning the side surface 12 of the removed sheet-like member 2. The transport conveyor 59 transports the sub Assy 33 between the sub Assy assembly unit 60 and the RIM sheet pasting unit 61 while supporting the sub Assy 33. The sub assembly assembly part 60 incorporates the sheet-like member 2 after the side surface cleaning into the sub assembly 33. The RIM sheet sticking unit 61 sticks the RIM sheet 34 to the sub assembly 33 after the sheet-like member 2 is assembled. Thereby, the backlight unit 31 is completed.

  In the manufacturing process of FIG. 4, when a protective sheet is stretched on the main surface of the sheet original fabric 62, the original fabric cleaning unit 52 is protected while the sheet original fabric 62 passes through the inside of the original fabric cleaning unit 52. Peel off the sheet. In many cases, the protective sheet is stretched on a prism sheet. When the protective sheet is peeled off, the sheet original fabric 62 after peeling is peeled and charged. However, in FIG. 4, the sheet original fabric 62 is not neutralized after peeling. Thus, when the first to fourth sheet original fabrics 62a to 62d are overlapped, the adhesion between the first to fourth sheet original fabrics 62a to 62d can be increased by charging, so the first to fourth sheets The probability of foreign matter intrusion between the original fabrics 62a to 62d can be lowered.

  As described above, the prism sheet of the second sheet piece 42 and the prism sheet of the third sheet piece 43 are orthogonal to each other in the axial direction of the prism. Normally, the manufacturing procedure of the prism sheet is as follows. First, a resin layer such as a UV curable resin is formed on the base sheet, and second, the base sheet is wound around a rotating uneven roller to continuously run. As a result, the unevenness on the surface of the uneven roller is transferred to the resin layer, and thirdly, the resin layer is cured by, for example, ultraviolet irradiation. That is, in the prism sheet original, the prism irregularities are formed in parallel to the longitudinal direction of the sheet original, so the second sheet original 62b and the third sheet original 62c are used as the sheet original. Are of the same kind. Therefore, in the supply unit 51, the axial direction of the prism sheet of the second sheet piece 42 and the third sheet piece 43 are made orthogonal to the conveyance direction of the second sheet original fabric 62 b and the conveyance direction of the third sheet original fabric 62 c. The axial direction of the prism sheet can be made orthogonal to each other easily.

  Then, the specific example of the manufacturing process of the backlight unit 31 is demonstrated in detail using FIG. In FIG. 4, the first sheet original fabric 62a is an original fabric for forming the upper diffusion sheet. The second sheet original fabric 62b is an original fabric for forming the upper prism sheet. The third sheet original fabric 62c is an original fabric for forming the lower prism sheet. The fourth sheet original fabric 62d is an original fabric for forming the lower diffusion sheet. In addition, the detail of each process in the manufacturing process of FIG. 4 is a preferable example, Comprising: It is not limited to the following content.

  The original sheet 62 and the blade contact sheet 63 are sandwiched by a pair of conveying rollers in the supply unit 51. By rotating the conveyance roller pair, the sheet original fabric 62 and the blade contact sheet 63 are fed out from the original fabric roll 64 and the sheet roll 65, and each sheet original fabric 62 and the blade contact sheet 63 are conveyed in the longitudinal direction, It is supplied to the next process. The supply unit 51 preferably further includes a back tension adjustment mechanism in order to apply tension to each of the original sheet 62 and the blade contact sheet 63.

  The original fabric cleaning unit 52 includes, for example, an adhesive roller pair having adhesiveness, and sandwiches the supplied original sheet 62 and blade contact sheet 63 between the adhesive roller pair. By rotating the adhesive roller pair, dust adhering to the main surfaces of the sheet original fabric 62 and the blade contact sheet 63 is removed, and the sheet original fabric 62 and the blade contact sheet 63 are moved in the longitudinal direction. To be supplied to the next process.

  The superposition part 53 has, for example, first and second ultrasonic welders. First, the fourth sheet original fabric 62d is overlaid on the blade contact sheet 63, and further the third sheet original fabric 62c is overlaid on the fourth sheet original fabric 62d, so that the third and fourth sheet original fabrics 62c, 62d. The space is temporarily fixed using the first ultrasonic welder.

  Specifically, the blade contact sheet 63 is pulled out from the sheet roll 65 as described above, and the front and back main surfaces are cleaned. As described above, the fourth sheet original fabric 62d is pulled out from the fourth original fabric roll 64d, the main surfaces of the front and back surfaces are cleaned, and are superposed on one main surface of the blade contact sheet 63 after cleaning. The conveyance direction of the third sheet original fabric 62 c is orthogonal to the conveyance direction of the fourth sheet original fabric 62 d and the blade contact sheet 63. The third sheet original fabric 62c is pulled out from the third original fabric roll 64c, passes through the third original fabric cleaning section 52c, and then cut in the width direction at predetermined lengths using a cutting blade, whereby a small piece It becomes. A small piece of the third sheet original fabric 62c is mounted on the fourth sheet original fabric 62d. The small piece of the third sheet original fabric 62c and the fourth sheet original fabric 62d are welded to each other at predetermined two welding points by the first ultrasonic welder. Thereby, the small piece of the third sheet original fabric 62d is fixed on the fourth sheet original fabric 62d.

  After the small pieces are fixed, the second sheet original fabric 62b and the first sheet original fabric 62a are sequentially laminated on the small pieces and the fourth sheet original fabric 62d. Next, the four layers of original sheets 62a to 62d are permanently fixed using a second ultrasonic welder.

  The first and second ultrasonic welders have ultrasonic horns attached to their tips. The first and second ultrasonic welders apply ultrasonic waves to the ultrasonic horn while pressing the laminate of the sheet original fabrics 62a to 62d to the ultrasonic horn. Thus, the pressed portions of the sheet original fabrics 62a to 62d are ultrasonically bonded to each other. In the first and second ultrasonic welders, the bonding strength may be set within a range in which the welded portion of the laminate is not melted.

  FIG. 4 shows a method of fixing between sheets using ultrasonic welding, but if the position of the small piece of the third sheet original fabric 62c and the fourth sheet original fabric 62d does not shift in the subsequent steps, Techniques other than sonic welding may be used, and the number of welding points may be more or less than two. Further, the welding point in the laminated body of the sheet original fabrics 62a to 62d is preferably located at a position that does not cover a portion cut out from the sheet original fabric 62 as a sheet piece of the sheet-like member 2 within the main surface of the sheet original fabric 62. Provided. This is because no warpage or distortion occurs in the sheet-like member 2. In other words, when there is a welded joint in the sheet-like member 2, there is a possibility that the sheet-like member 2 is warped and distorted due to the difference in expansion and contraction of the sheet pieces due to environmental changes such as temperature and humidity. is there. If warpage and distortion occur in the sheet-like member 2, it affects the optical characteristics of the sheet-like member 2, so it is better not to provide a joint in the sheet-like member 2.

  The cutting unit 54 is, for example, a cutting machine that cuts out a sheet-like member 2 having a desired shape from a laminate of the sheet original fabric 62. The cutting unit 54 is generally a punching machine using a servo press. A Thomson type or a pinnacle type is used for the punching die of the cutting portion 54. That is, the cutting part 54 places the laminated body of the sheet original fabrics 62a to 62d on the cutting table with the blade contact sheet 63 facing down, brings the punching die close to the laminated body from above the cutting table, and the cutting edge of the punching die is the blade. Stop at the position where it bites into the contact sheet 63. Therefore, the cut sheet 54 can cut all the stacked sheet original fabrics 62a to 62d, and the cutting edge of the punching die does not hit the cutting table. By interposing the blade contact sheet 63, the life of the punching die can be extended, and the cut sheet-like member 2 can be transported while being placed on the blade contact sheet 63 together with the punched end material 66.

  The cut sheet-like member 2 passes through the planar cleaning unit 55 together with the punched end material 66. The planar cleaning unit 55 removes foreign matter 28 such as dust adhering to the main surfaces of the sheet-like member 2 and the punched end material 66. The planar cleaning unit 55 preferably uses one or a plurality of adhesive rolls having adhesiveness on the side surfaces, and the side surfaces of the adhesive rolls are brought into contact with the main surfaces of the sheet-like member 2 and the punched end material 66. It is preferable that belts are stretched at a plurality of locations on the adhesive roll in a direction orthogonal to the conveying direction of the sheet-like member 2 so as not to lift the sheet piece of the outermost layer of the sheet-like member 2.

  The punched end material 66 is collected by being wound around a punched-out roll 67. The take-out portion 57 has a knife-edge member, and is thinner on the downstream side in the transport direction than on the upstream side in the transport direction of the sheet-like member 2. An extraction portion 57 is applied from the blade contact sheet 63 side of the punched end material 66. In other words, the punched end material 66 is bent in the conveying direction when passing through the take-out portion 57 and is wound around the punched-out roll 67.

  At the time of collecting the punched end material 66, the take-out part 57 that is a means for collecting the punched end material 66 also functions as a carrying-out means for the sheet-like member 2. That is, since the sheet-like member 2 is separated from the punched end material 66, the sheet-like member 2 is separated from the punched end material 66 when the punched end material 66 is bent through the extraction portion 57. The separated sheet-like member 2 tends to advance while maintaining the conveyance direction when passing through the take-out portion 57 due to the rigidity of the sheet-like member 2 itself. A gripping hand 58 of the moving mechanism 56 stands by at a location on the downstream side in the transport direction as viewed from the takeout portion 57 and grips the sheet-like member 2 after passing through the takeout portion 57. Thereby, the sheet-like member 2 is completely separated from the punched end material 66.

  The sheet-like member 2 taken out by the gripping hand 58 is transferred to the sheet-like member cleaning device 1 by the moving mechanism 56. As described above, the sheet-like member cleaning device 1 positions the sheet-like member 2 while cleaning the side surface 12 of the sheet-like member 2. After the side surface cleaning, the gripping hand 58 takes out the sheet-like member 2 from the sheet-like member cleaning device 1 and conveys it to the sub-Assy assembly unit 60.

  The sub assembly unit 60 incorporates the sheet-like member 2 into the sub assembly 33. Specifically, the sub-Assy 33 is placed on one end of the transport conveyor 59 and is on standby. The sheet-like member 2 is transferred into the sub assembly assembly 60 by the gripping hand 58, guided by a guide or the like, and dropped from above the sub assembly 33 to a predetermined position of the standby sub assembly 33. When the sheet-like member 2 is assembled in the sub assembly 33, the conveyance conveyor 59 conveys the assembled sub assembly 33 to the RIM sheet pasting unit 61.

  The RIM sheet sticking unit 61 sticks the RIM sheet 34 to the transported sub assembly 33. Specifically, the RIM sheet 34 is sucked and supported in advance on the internal pushing member. From above the conveyed sub-Assy 33, the RIM sheet 34 currently being supported by suction is pushed together with the pushing member into a predetermined position with a predetermined force. The suction support is released and the pushing member is retracted, whereby the RIM sheet 34 is attached. Thereby, the backlight unit 31 is completed.

  The backlight unit 31 is manufactured by the manufacturing process as described above. In FIG. 4, the cleaning of the cut surface of the sheet-like member 2 and the positioning of the sheet-like member 2 with respect to the gripping hand 58 can be performed simultaneously in the side surface cleaning process of the sheet-like member 2. Therefore, since the manufacturing process of the backlight unit 31 of FIG. 3 is simplified, the yield of the backlight unit 31 can be improved and the throughput of the entire manufacturing process can be improved.

  FIG. 5 is a schematic diagram for explaining a configuration of a sheet-like member cleaning device 71 according to the second embodiment of the present invention. When the sheet-like member cleaning device 1 of the first embodiment and the sheet-like member cleaning device 71 of the second embodiment are compared, some of the configurations of these devices 1 and 71 are equal to each other. Specifically, in the sheet-like member cleaning device 71 of the second embodiment, only the support base is different from the sheet-like member cleaning device 1 of the first embodiment. Therefore, in the description of FIG. 5, among the configurations of the sheet-like member cleaning device 71 of the second embodiment, the same names and the same reference numerals are given to the same configurations as those of the sheet-like member cleaning device 1 of the first embodiment. The description may be omitted. Further, the sheet-like member cleaning device 71 of the first embodiment of the second embodiment is used in the sheet-like member manufacturing process and the backup unit manufacturing process described in the first embodiment, instead of the sheet-like member cleaning device 1. it can.

  5 cleans the side surface 12 of the sheet-like member 2. The sheet-like member cleaning device 71 includes at least one foreign matter removing unit 4, and more preferably includes a moving unit 5, a transfer unit 6, a pressing unit 8, a pressing driving unit 9, a support base 72, and a gas ejection unit 73. . The support base 72 has a placement portion 76 for placing the sheet-like member 2 thereon. The removal surface 11 of the foreign substance removal unit 4 moves and contacts the side surface 12 of the sheet-like member 2 placed on the placement unit 76 while maintaining a substantially parallel state.

  The mounting portion 76 of the support base 72 is formed with a flat mounting surface 74 having a plurality of holes 75 through which gas can pass. In a state where the sheet-like member 2 is placed on the placement surface 74, the gas ejection unit 73 supplies gas to the plurality of holes 75 of the placement unit 76 and ejects the gas from the openings of the placement surface 74. . As a result, the sheet-like member 2 floats from the mounting surface 74 of the support base 72. Therefore, when the sheet-like member 2 on the support table 72 is pushed by the removal surface 11 and moves, the friction between the sheet-like member 2 and the support table 72 becomes smaller. Accordingly, the sheet-like member cleaning device 71 in FIG. 5 can position the sheet-like member 2 without sliding between the sheet-like member 2 and the support base 72, so that the friction with respect to the positioning of the sheet-like member 2 is reduced. The influence can be made smaller.

  Specifically, the mounting portion 76 of the support base 72 is formed of a porous member, and a compressed air channel 77 is provided on the back surface side of the mounting portion 76. The flow path 77 is connected to the gas ejection part 73. Only when the sheet-like member 2 is positioned, the gas ejection part 73 supplies the compressed air to the flow path 77, whereby the sheet-like member 2 can be floated from the placement part 76. With such a simple configuration, the sheet-like member cleaning device 71 of FIG. 5 can eliminate sliding between the sheet-like member 2 and the support base 7 when the sheet-like member 2 is positioned.

  Moreover, the sheet-like member cleaning device 71 of FIG. 5 may further include a gas suction unit 78 for sucking gas. In a state where the sheet-like member 2 is placed on the placement surface 74, the gas suction unit 78 guides the suction force to the plurality of holes 75 of the placement unit 76 and sucks the gas from the openings of the placement surface 74. . Specifically, the gas suction unit 78 may suck the gas inside the flow channel 77 during mounting. As a result, the sheet-like member 2 comes into close contact with the placement surface 74. Therefore, for example, when the removal surface 11 is pressed against the sheet-like member 2 on the placement surface 74, the sheet-like member 2 is reliably supported, so that the posture of the sheet-like member 2 is not disturbed. Thereby, the sheet-like member cleaning device 71 in FIG. 5 can more reliably clean the side surface of the sheet-like member 2.

  FIG. 6 is a schematic diagram for explaining a configuration of a sheet-like member cleaning device 81 according to the third embodiment of the present invention. When the sheet-like member cleaning devices 1 and 71 of the first and second embodiments are compared with the sheet-like member cleaning device 81 of the third embodiment, a part of the configuration of these devices 1, 71 and 81 is mutually equal. . Therefore, in the description of FIG. 6, among the configurations of the sheet-like member cleaning device 81 of the third embodiment, the same names and the same names as the configurations of the sheet-like member cleaning devices 1 and 71 of the first and second embodiments are used. The same reference numerals are attached and the description may be omitted.

  Specifically, in the sheet-like member cleaning device 81 according to the third embodiment, the configuration different from the sheet-like member cleaning device 1 according to the first embodiment is only the foreign substance removing unit and the support base. And the support stand of the sheet-like member cleaning apparatus 81 of 3rd Embodiment has a structure equal to the support stand 72 of the sheet-like member cleaning apparatus 71 of 2nd Embodiment. In addition, in the sheet-like member cleaning apparatus 81 of the third embodiment, the support base 7 of the sheet-like member cleaning apparatus 1 of the first embodiment is replaced with the support base 72 of the sheet-like member cleaning apparatus 71 of the second embodiment. You may use. Moreover, the sheet-like member cleaning apparatus 81 of 3rd Embodiment can be used for the sheet-like member manufacturing process demonstrated in 1st Embodiment, and the backup unit manufacturing process instead of the sheet-like member cleaning apparatus 1. FIG.

  6 cleans the side surface 12 of the sheet-like member 2. The sheet-like member cleaning device 81 includes at least one foreign matter removing unit 4, and more preferably includes a moving unit 5, a transfer unit 6, a pressing unit 8, a pressing driving unit 9, a support base 72, and a gas ejection unit 73. .

  The foreign matter removing unit 4 includes a flat foreign matter removing plate 82. The removal surface 11 is formed on at least one surface of the foreign material removal plate 82. The foreign matter removing plate 82 is not only in the direction in which the removal surface 11 contacts / separates from the sheet-like member 2 but also in a direction substantially parallel to the side surface of the sheet-like member 2, that is, substantially perpendicular to the contact / separation direction. The removal surface 11 is configured to be movable in any direction.

  As a result, if the removal surface 11 of the foreign material removal plate 82 is larger than the side surface 12 of the sheet-like member 2, the portion in contact with the side surface 12 of the sheet-like member in the removal surface 11 can be updated sequentially. Accordingly, since only a single portion in the removal surface 11 comes into contact with the side surface 12 of the sheet-like member 2 and the removed foreign material 28 is prevented from accumulating on the removal surface 11, foreign material removal is easier and more reliable. Become. Moreover, since the foreign material removal plate 82 is configured to be movable in a direction substantially parallel to the removal surface 11, the contact portion of the removal surface 11 can be easily updated.

  A detailed configuration of the sheet-like member cleaning device 81 will be described below with reference to FIG. In the foreign matter removing plate 82, at least a portion on the removal surface 11 side that comes into contact with the sheet-like member 2 is formed of an elastic body having adhesiveness. The elastic body having adhesiveness is realized by, for example, silicon rubber or butyl rubber. The width of the removal surface 11 of the foreign substance removal plate 82 is wider than the width of the side surface 12 of the sheet-like member 2 at least in the normal direction of the main surface of the sheet-like member 2.

  The transfer roller 83 in FIG. 6 has the same structure as that of the transfer roller 15 in FIG. The outer peripheral portion of the transfer roller 83 is formed of an elastic body having higher adhesiveness than the foreign matter removing plate 82. The transfer surface 16 that is the side surface of the transfer roller 83 is in contact with the removal surface 11 of the foreign matter removal plate 82.

  A part of the removal surface 11 of the foreign material removal plate 82 contacts the side surface 12 of the sheet-like member 2 to remove the foreign material 28 on the side surface 12. After removing the foreign matter and before contacting the next sheet-like member 2, the foreign matter-removing plate 82 has at least the width of the side surface 12 of the sheet-like member 2 in the direction 84 substantially parallel to the side surface 12 of the sheet-like member 2. Move by minutes. As a result, a new portion free of foreign matter on the removal surface 11 of the foreign matter removing plate 82 is brought into contact with the next sheet-like member 2. When the foreign matter has adhered to the entire removal surface 11 of the foreign matter removal plate 82, the foreign matter removal plate 82 is moved in a direction 84 substantially parallel to the side surface 12 of the sheet-like member 2. The entire removal surface 11 is brought into contact with the transfer surface 16. As a result, the foreign matter 28 removed by the foreign matter removing plate 82 from the sheet-like member 2 is transferred to the transfer roller 83 in contact therewith. After the transfer, the position of the foreign substance removal plate 82 is returned to the initial state. By repeating the above operation, the foreign material 28 is removed from the side surface 12 of the sheet-like member 2 while positioning the sheet-like member 2 using a simple configuration.

  As described above, the sheet-like member cleaning devices 1, 71, 81 of the first to third embodiments can easily serve as the positioning of the sheet-like member 2 for the side surface cleaning of the sheet-like member 2. When such a sheet-like member cleaning device 1, 71, 81, a sheet-like member cleaning method, a sheet-like member manufacturing method, and a backlight unit manufacturing method according to the present invention are used, Since foreign matter 28 such as adhering dust is extremely reduced, the bright spots of the liquid crystal display device using the backlight unit 31 can be reduced. As a result, the present invention can reduce the chance of the sheet-like member 2 being damaged, reduce the number of steps necessary for assembling the backlight unit 31, and improve the yield of the sheet-like member 2 and the backlight unit 31. .

  In the sheet-like member cleaning devices 1, 71, 81, the sheet-like member cleaning method, the sheet-like member manufacturing method, and the backlight unit manufacturing method described in the first to third embodiments, details of various components are as follows. This is one of the best embodiments of the components of the present invention. The detailed configuration of the constituent elements of the present invention is not limited to the above-described configuration as long as the above-described effects can be exhibited, and various other configurations may be used.

It is a schematic diagram which shows the structure of the sheet-like member cleaning apparatus 1 which is 1st Embodiment of this invention. It is operation | movement explanatory drawing of the sheet-like member cleaning apparatus 1 of FIG. It is a disassembled perspective view which shows the structure of the backlight unit 31 manufactured with the manufacturing apparatus using the sheet-like member cleaning apparatus of FIG. It is a schematic diagram which shows the structure of the manufacturing apparatus of the backlight unit 31 containing the sheet-like member cleaning apparatus 1 of FIG. It is a schematic diagram which shows the structure of the sheet-like member cleaning apparatus 71 which is 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the sheet-like member cleaning apparatus 81 which is 3rd Embodiment of this invention. It is a perspective view which shows the structure of the liquid crystal display device 100 of a prior art. It is a block diagram of the cleaning apparatus of the sheet-like member of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,71,81 Sheet-like member cleaning apparatus 2 Sheet-like member 4 Foreign material removal part 6 Transfer part 7,72 Support stand 8 Pressing part 11 Removal surface of foreign material removal part 12 Side surface of sheet-like member 14 Removal roller 15,83 Transfer roller 16 Transfer surface of transfer portion 18, 76 Mounting portion of support base 19 Protrusion of mounting portion 28 Foreign matter 29 Positioning position of foreign matter removing portion 31 Backlight unit 33 Sub-Assy
41 1st sheet piece 42 2nd sheet piece 43 3rd sheet piece 44 4th sheet piece 73 Gas ejection part 74 Mounting surface of mounting part 75 Hole of mounting part 78 Gas suction part 82 Foreign material removal plate

Claims (17)

A sheet-like member cleaning device for cleaning a side surface of a sheet-like member,
Including a foreign matter removing means having a planar removal surface having adhesiveness,
The sheet-like member cleaning apparatus, wherein the removal surface is moved in a state substantially parallel to the side surface of the sheet-like member, and the removal surface is brought into contact with the side surface of the sheet-like member. The foreign matter removing means comprises a polygonal column-shaped removal roller,
The removal surface having the adhesiveness is formed on at least one side surface of the removal roller,
The sheet-like member cleaning device according to claim 1, wherein the removal roller is provided so as to be angularly displaceable about a center axis as a rotation center. The foreign matter removing means comprises a flat foreign matter removing plate,
On at least one surface of the foreign substance removal plate, a removal surface having the adhesiveness is formed,
The sheet-like member cleaning device according to claim 1, wherein the foreign substance removing plate is provided so as to be movable in a direction substantially parallel to a side surface of the sheet-like member.   The sheet-like member cleaning device according to any one of claims 1 to 3, wherein a removal surface of the foreign matter removing means is formed of a surface of an elastic body having adhesiveness.   The removal surfaces of the plurality of foreign matter removing means are respectively moved from both sides of the sheet-like member in a direction close to both side surfaces of the sheet-like member, and are simultaneously brought into contact with both side surfaces of the sheet-like member. The sheet-like member cleaning device according to any one of claims 1 to 4.   The sheet-like member cleaning according to any one of claims 1 to 5, wherein the removal surface of the foreign matter removing means is moved so as to reach a predetermined position and is brought into contact with a side surface of the sheet-like member. apparatus. Further comprising a transfer means having a transfer surface capable of contacting the removal surface of the foreign matter removing means,
The sheet-like member cleaning device according to claim 1, wherein the transfer surface of the transfer unit has higher adhesiveness than the removal surface of the foreign matter removing unit. The transfer means comprises a cylindrical transfer roller that can be angularly displaced about a central axis as a rotation center,
8. The sheet-like member cleaning device according to claim 7, wherein a transfer surface made of an elastic body having high adhesiveness is formed on an outer peripheral surface of the transfer roller. Further comprising a support base having a placement portion for placing the sheet-like member,
The sheet-like member cleaning device according to any one of claims 1 to 8, wherein the placement unit is configured by a plurality of protrusions. A support base having a placement portion for placing the sheet-like member;
Gas ejecting means for ejecting gas, and
The mounting portion is formed with a planar mounting surface in which a plurality of holes through which gas can pass is opened,
The sheet-like member cleaning device according to any one of claims 1 to 8, wherein the gas jetting unit supplies gas to the plurality of holes of the placement unit and jets the gas from the opening. A support base having a placement portion for placing the sheet-like member;
Gas suction means for sucking gas,
The mounting portion is formed with a planar mounting surface in which a plurality of holes through which gas can pass is opened,
The sheet-like member cleaning device according to any one of claims 1 to 10, wherein the gas suction means guides a suction force to the plurality of holes of the mounting portion and sucks the opening from the opening. A support base having a placement portion for placing the sheet-like member;
The sheet-like member according to any one of claims 1 to 11, further comprising pressing means for pressing the sheet-like member toward the placement portion on the placement portion of the support base. Cleaning device.   The said holding | suppressing means consists of a flat member smaller than the said sheet-like member, and is movable with this sheet-like member in the direction substantially parallel to the said sheet-like member. Sheet-like member cleaning device.   The sheet-like member cleaning device according to any one of claims 1 to 13, wherein the sheet-like member is configured by laminating a plurality of sheet pieces. A sheet-like member cleaning method for cleaning a side surface of a sheet-like member using a foreign matter removing means having a planar removal surface having adhesiveness,
A sheet-like member cleaning method, wherein the removal surface of the foreign matter removing means is moved in a state substantially parallel to the side surface of the sheet-like member and brought into contact with the side surface. A superposition process in which a plurality of sheets are overlapped with each other;
Punching process of punching the overlapped sheet material into a predetermined shape to form a sheet-like member composed of a plurality of sheet pieces;
A side surface cleaning step of cleaning at least one cut surface which is a side surface of the sheet-like member,
The method for producing a sheet-like member, wherein the side surface cleaning step moves a planar removal surface having adhesiveness so as to be in contact with the cut surface of the sheet-like member in a substantially parallel state. A superposition process in which a plurality of sheets are overlapped with each other;
A punching step of punching the stacked sheet material into a predetermined shape to form an optical sheet laminate composed of a plurality of sheet pieces;
A side surface cleaning step for cleaning at least one cut surface which is a side surface of the optical sheet laminate;
Incorporating the optical sheet laminate into the structure of the backlight unit,
The method for manufacturing a backlight unit, wherein the side surface cleaning step moves the planar removal surface having adhesiveness so as to be in contact with the cut surface of the optical sheet laminate in a substantially parallel state.

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