JP2009196813A - Gripping device - Google Patents

Gripping device Download PDF

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Publication number
JP2009196813A
JP2009196813A JP2008043640A JP2008043640A JP2009196813A JP 2009196813 A JP2009196813 A JP 2009196813A JP 2008043640 A JP2008043640 A JP 2008043640A JP 2008043640 A JP2008043640 A JP 2008043640A JP 2009196813 A JP2009196813 A JP 2009196813A
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JP
Japan
Prior art keywords
gripping
optical sheet
optical
sheet laminate
sheets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2008043640A
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Japanese (ja)
Inventor
Yasushi Shoji
裕史 庄子
Original Assignee
Sharp Corp
シャープ株式会社
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Application filed by Sharp Corp, シャープ株式会社 filed Critical Sharp Corp
Priority to JP2008043640A priority Critical patent/JP2009196813A/en
Publication of JP2009196813A publication Critical patent/JP2009196813A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065Manufacturing aspects; Material aspects
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00Feeding articles separated from piles; Feeding articles to machines
    • B65H5/08Feeding articles separated from piles; Feeding articles to machines by grippers, e.g. suction grippers
    • B65H5/14Details of grippers; Actuating-mechanisms therefor
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gripping device capable of gripping an optical sheer laminated body, without being integrated by a means such as joining mutual optical sheets, without damaging the optical sheets. <P>SOLUTION: This gripping device 1 includes a pair of gripping members 11 and 12, and a support means 13 for supporting the pair of gripping members 11 and 12 to mutually approach and to be separably displaced in the displacement direction Z, and grips the optical sheet laminated body 20 from both sides in the thickness direction by the pair of gripping members 11 and 12. Abutting surface parts 11a and 12a abutting on the optical sheet laminated body 20 of the respective gripping members 11 and 12, are composed of an elastic material, and are set in A50 or less in durometer hardness prescribed in JIS K6253. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gripping device that grips and transports a plurality of stacked optical sheets as a group, sandwiching the front and back surfaces thereof.

  In a planar light emitting device used for illuminating a liquid crystal display element, at least one prism sheet having a condensing function and at least one diffusion sheet for uniformly diffusing emitted light are incorporated. Optical sheets such as a prism sheet and a diffusion sheet can be obtained by punching only the optical sheet into a predetermined shape in a state where the optical sheet is bonded to the conveyance sheet. The punched optical sheets are taken out one by one by hand and assembled into a planar light emitting device. When the process of taking out the punched optical sheet is automated, a method of picking up the surface of the optical sheet and taking it out one by one is used.

  Patent Document 1 discloses a method in which a plurality of optical sheets are cut into a predetermined shape while being stacked and handled while the plurality of optical sheets are stacked. According to the method disclosed in Patent Document 1, the optical sheet cutting process required for the number of optical sheets incorporated in the planar light emitting device is completed for each planar light emitting device in one step. In addition, since a plurality of optical sheets are handled in a stacked state, there is a low possibility that dust will enter between the optical sheets, and an improvement in product yield can be expected.

  When handling the laminated sheets as a unit, it is difficult to handle the sheets so that they do not shift manually, and there is a risk that the sheets will be damaged by applying a load larger than an allowable load. Further, in the method of automatically adsorbing the surface of the sheet, only the sheet positioned on the uppermost surface can be handled, and the superiority of handling in a stacked state is impaired. In order to handle a plurality of optical sheets as they are stacked, the method disclosed in Patent Document 1 described above joins the peripheral edges of the optical sheet stack.

  As a device that handles the stacked sheets as a whole without joining, a device that grips the stacked sheets is used to prevent the sheets from shifting. A device that handles a sheet that cannot be pressed and held particularly strongly is disclosed in Patent Document 2, for example. In the apparatus disclosed in Patent Document 2, a sheet body in which a plurality of sheets are stacked is pressed with a weak force by a sandwiching plate, and the sheets are moved together by the inertial force and centrifugal force generated when the sandwiching plate is swung and moved. In order to prevent displacement, the sandwiching plate is inclined.

JP 2007-156014 A JP 2003-20135 A

  In the method disclosed in Patent Document 1, in order to handle the laminated optical sheets as a unit, it is necessary to join the peripheral edges of the laminated body of optical sheets as described above. In this joined region (hereinafter referred to as “joined region”), the optical sheet is distorted and the flatness of the optical sheet laminate is impaired, and the required optical characteristics may not be obtained particularly in the vicinity of the joined region. is there.

  In the apparatus disclosed in Patent Document 2, it is possible to prevent the stacked sheets from shifting from each other, and it is possible to control the load on the sheets. The sheet body is a sheet body in which sheets having a planar surface such as an X-ray film are laminated. In the technique disclosed in Patent Document 2, an optical sheet stack including a prism sheet on which a prism peak is formed and another optical sheet stacked on the prism sheet via the prism peak, for example, a first diffusion sheet, It is not assumed that an optical sheet laminate in which four sheets of a first prism sheet, a second prism sheet, and a second diffusion sheet are laminated in this order is handled. When gripping an optical sheet laminate in which other optical sheets are stacked on the prism sheet in this manner, depending on the gripping pressure, the prism crests may bite into the other optical sheet, and the other optical sheet may be damaged. is there. In the technique disclosed in Patent Document 2, a gripping pressure that can be gripped without damaging the optical sheet is not obtained.

  Patent Document 2 also discloses a method of handling the sheet by simply tilting a support plate that supports the sheet without holding the sheet, but when this method is applied to the optical sheet laminate, the optical sheet is warped. In some cases, the optical sheets cannot be transferred without causing a shift between the optical sheets.

  The object of the present invention is to hold an optical sheet laminate in which a plurality of optical sheets are laminated together without damaging the optical sheets and without integrating them by means such as joining the optical sheets together. It is an object of the present invention to provide a gripping device that can do this.

The present invention provides a first optical sheet on which a protrusion protruding to one side in the thickness direction is formed, and a surface on one side in the thickness direction of the first optical sheet via the protrusion formed on the first optical sheet. A gripping device for gripping the optical sheet laminate including the second optical sheet laminated on the part from both sides in the thickness direction,
A pair of gripping members provided so as to be capable of moving toward and away from each other in a predetermined displacement direction, and gripping the optical sheet laminate;
Supporting means for supporting the pair of gripping members so as to be able to move toward and away from each other in the displacement direction,
The abutting surface portion that abuts the optical sheet laminate of each gripping member is made of an elastic material and has a durometer hardness defined by Japanese Industrial Standard K6253 of A50 or less.

  According to the present invention, the contact surface portion of each gripping member is made of nitrile rubber, and has a durometer hardness defined by Japanese Industrial Standard K6253 of A30 or more and A50 or less.

In addition, the present invention is characterized in that the gripping pressure on the surface portion of the optical sheet laminate by each gripping member is 1 N / cm 2 or more and 3 N / cm 2 or less.

  According to the present invention, each gripping member is formed such that the surface area of the abutting surface portion is 5% or more and less than 50% of the total surface area of the surface portion of the optical sheet laminate on which the gripping member abuts. It is characterized by.

  Further, the invention is characterized in that the contact surface portions of the pair of gripping members are formed symmetrically with respect to a virtual plane perpendicular to the displacement direction.

  Further, the invention is characterized in that the outer peripheral edge portion of the contact surface portion of each gripping member is formed in a curved surface shape.

  According to the present invention, the optical sheet laminate in which the second optical sheet is laminated on the surface portion on one side in the thickness direction of the first optical sheet via the protruding portion is displaced in the displacement direction by the support means from both sides in the thickness direction. Are gripped by a pair of gripping members that are displaced toward and away from each other. Accordingly, the optical sheet laminate can be gripped without being integrated by means such as joining optical sheets constituting the optical sheet laminate. Further, the abutting surface portion of each gripping member that abuts against the optical sheet laminate is made of an elastic material, and has a durometer hardness of A50 or less as defined in Japanese Industrial Standard K6253. Thereby, it is possible to prevent the surface portions on both sides in the thickness direction, which are the surface portions in contact with the gripping member of the optical sheet laminate, from being damaged by the gripping member. In addition, since the gripping pressure when the pair of gripping members grips the optical sheet laminate can be prevented from being concentrated on the projections formed on the first optical sheet, the thickness of the second optical sheet It is possible to prevent the surface portion on the other side in the direction from being damaged by the protrusion of the first optical sheet, and it is possible to prevent the protrusion from being deformed. Therefore, the optical sheet laminate can be gripped without damaging each optical sheet constituting the optical sheet laminate.

  Further, according to the present invention, the contact surface portion of each gripping member is made of nitrile rubber, and the durometer hardness defined in Japanese Industrial Standard K6253 is A30 or more and A50 or less. Accordingly, it is possible to prevent damage to each optical sheet constituting the optical sheet laminate, and it is possible to prevent the optical sheet from sticking to the gripping member and transferring the gripping member to the optical sheet. Therefore, the holding operation of the optical sheet laminate can be performed more stably.

According to the invention, the optical sheet laminate is gripped by the gripping member with a gripping pressure of 1 N / cm 2 or more and 3 N / cm 2 or less. Thereby, it can prevent more reliably that the surface part of the thickness direction both sides of an optical sheet laminated body is damaged with a holding member. Further, when the optical sheet laminate is gripped and transferred, it is possible to more reliably prevent the optical sheets constituting the optical sheet laminate from being misaligned and to transfer the optical sheet laminate more stably.

  Further, according to the present invention, each gripping member has a surface area of the abutting surface portion that is a portion that grips the optical sheet laminate, and the total area of the surface portion of the optical sheet laminate that the gripping member abuts. Of 5% or more and less than 50%. As a result, the gripping area by each gripping member when gripping the optical sheet laminate, i.e., the gripping area of each gripping member with respect to the optical sheet laminate, is determined on the surface of the surface portion of the surface of the optical sheet laminate that contacts the gripping member. The total area can be 5% or more and less than 50%. Thereby, when the optical sheet laminate is gripped by the gripping device, it is possible to prevent the optical sheets constituting the optical sheet laminate from being displaced. For example, when the optical sheet laminate is transported by a transport sheet, supplied to the gripping device in a state of protruding from the folded portion of the transport sheet to the gripping device, and gripped by the gripping device, Since the amount of protrusion to the gripping device side can be gripped by the gripping device without being 50% or more of the total area of the surface portion of the optical sheet laminate that contacts the gripping member, gravity It is possible to prevent the optical sheets from shifting due to the influence of the above. Further, when the optical sheet laminate is gripped by a gripping device and transferred between processes, it can be easily transferred to the apparatus for the next process.

  Further, according to the present invention, the contact surface portions of the pair of gripping members are formed symmetrically with respect to a virtual plane perpendicular to the displacement direction, so that gripping is performed with respect to the surface portions on both sides in the thickness direction of the optical sheet laminate. The holding pressure by the member can be applied uniformly. Accordingly, it is possible to prevent a gripping pressure from being locally applied to the optical sheet laminate, and thus it is possible to prevent deformation and bending of the optical sheet laminate.

  Further, according to the present invention, the outer peripheral edge portion of the contact surface portion of each gripping member is formed in a curved surface shape. Thus, when the optical sheet laminate is gripped by the gripping member, the optical sheet laminate and each optical sheet constituting the optical sheet laminate are deformed into a curved shape along the curved outer peripheral edge of the gripping member. Therefore, it is possible to prevent the optical sheet from being damaged like a fold.

  FIG. 1 is a side view showing a gripping device 1 according to an embodiment of the present invention. The gripping device 1 includes a pair of gripping members, that is, a first gripping member 11 and a second gripping member 12, and support means 13 that supports the pair of gripping members 11 and 12. The gripping device 1 is an optical sheet laminate gripping device that grips the optical sheet laminate 20. The gripping device 1 grips the optical sheet laminate 20 from both sides in the thickness direction. The optical sheet laminate 20 is configured by laminating a plurality of optical sheets 21 to 24 in the thickness direction.

  The pair of gripping members 11 and 12 are provided so as to be able to move toward and away from each other in a predetermined displacement direction Z. The optical sheet laminate 20 is gripped by the pair of gripping members 11 and 12 so that the thickness direction thereof is parallel to the displacement direction Z. In a state where the optical sheet laminate 20 is gripped by the pair of gripping members 11, 12, the first gripping member 11 is from the Z1 side of the displacement direction Z with respect to the optical sheet laminate 20 in the thickness direction of the optical sheet laminate 20. The second gripping member 12 comes into contact with a surface portion on one side (hereinafter also referred to as “one-side contact surface portion”) 20 a, and the second gripping member 12 is laminated on the optical sheet laminate 20 from the other Z2 side in the displacement direction Z. The body 20 abuts on a surface portion on the other side in the thickness direction of the body 20 (hereinafter also referred to as “other-side abutting surface portion”) 20b. Hereinafter, the one-side contact surface portion and the other-side contact surface portion of the optical sheet laminate may be collectively referred to as “contact surface portion”. In the present embodiment, the other Z2 of the displacement direction Z coincides with the vertical direction, and one Z1 of the displacement direction Z coincides with the opposite direction of the vertical direction.

  The contact surface portions 11a and 12a, which are the surface portions that contact the optical sheet laminate 20 of the first and second gripping members 11 and 12, are both made of an elastic material and defined in Japanese Industrial Standard (abbreviated as JIS) K6253. Durometer hardness (hereinafter sometimes simply referred to as “durometer hardness”) is A50 or less. Specifically, the contact surface portions 11a and 12a of the first and second gripping members 11 and 12 are both made of nitrile rubber and have a durometer hardness of A30 or more and A50 or less.

  In the present embodiment, both the first and second gripping members 11 and 12 are integrally formed of the same material as a whole including the contact surface portions 11a and 12a. That is, both the first and second gripping members 11 and 12 are made of an elastic material, specifically, nitrile rubber, and contact surface portions 11a and 12a which are surface portions that contact the optical sheet laminate 20. The durometer hardness is A50 or less, more specifically A30 or more and A50 or less.

The durometer hardness is measured as follows.
Place the test piece on a flat steel plate and keep the durometer pressure plate parallel to the surface of the test piece while keeping the durometer pusher axis perpendicular to the surface of the test piece. And press gently until the pressure plate contacts the surface of the test piece. At this time, a weight is added so that the mass including the durometer is 1 kg. The dimensions of the test piece are 30 mm in length and 30 mm in width, and in the case of a rubber material, a sheet of 1 mm thickness, and six rubber sheets are stacked in the thickness direction to form a test piece. The tip of the push needle is positioned 12 mm or more away from the end of the test piece, and the scale displayed on the durometer is read. A type A durometer is used as the durometer.

  The contact surface portions 11a and 12a of the grip members 11 and 12 are planar, and the grip members 11 and 12 grip the optical sheet laminate 20 with the entire contact surface portions 11a and 12a. Accordingly, the area of the surface of the contact surface portion 11a, 12a of each gripping member 11, 12 becomes the gripping area of the optical sheet laminate 20 by the gripping member 11, 12. The surface areas of the contact surface portions 11 a and 12 a of the gripping members 11 and 12 are selected according to the surface areas of the contact surface portions 20 a and 20 b of the optical sheet laminate 20. Specifically, the area of the surface of the contact surface portion 11a, 12a of each gripping member 11, 12, that is, the gripping area of the optical sheet laminate 20 by each gripping member 11, 12 is the gripping member of the optical sheet laminate 20. 11 and 12 is selected so as to be less than 50%, more specifically, 5% or more and less than 50% of the total area of the surface of the contact surface portions 20a and 20b which are the surface portions on the side in contact with 11 and 12. Therefore, in this embodiment, the gripping area of the optical sheet laminate 20 by the gripping members 11 and 12 is less than 50% of the total area of the surface of the contact surface portions 20a and 20b of the optical sheet laminate 20, more specifically, 5% or more and less than 50%.

  The contact surface portion 11a of the first gripping member 11 and the contact surface portion 12a of the second gripping member 12 are in a virtual plane perpendicular to the displacement direction Z, that is, the first direction X and the displacement direction perpendicular to the displacement direction Z. Z is formed symmetrically with respect to a virtual plane parallel to the second direction Y perpendicular to the first direction X. More specifically, the contact surface portions 11a and 12a of the first and second gripping members 11 and 12 are formed to have the same dimensions. In the present embodiment, each of the first and second gripping members 11 and 12 has a strip-like plate shape extending in the first direction X, which is one direction perpendicular to the displacement direction Z, and a thickness direction parallel to the displacement direction Z. One surface part is contact surface part 11a, 12a.

  The dimensions (hereinafter also referred to as “width-direction dimensions”) W1 and W2 of the gripping members 11 and 12 in the second direction Y are selected according to the width-direction dimension W3 of the optical sheet laminate 20 to be gripped. Specifically, the width direction dimensions W1 and W2 of the gripping members 11 and 12 are selected to be less than 50%, more specifically, 5% to less than 50% of the width direction dimension W3 of the optical sheet laminate 20 to be gripped. It is.

  The support means 13 supports the pair of gripping members 11 and 12 so as to be able to move close to and away from each other in the displacement direction Z. The support means 13 connects the first support part 14 that supports the first gripping member 11, the second support part 15 that supports the second gripping member 12, and the first support part 14 and the second support part 15. And a connecting portion 16. The first and second support portions 14 and 15 are formed in a substantially flat plate shape. The first gripping member 11 is provided on the surface portion facing the second support portion 15 among the surface portions on both sides in the thickness direction of the first support portion 14. The second gripping member 12 is provided on a surface portion facing the first support portion 14 among the surface portions on both sides in the thickness direction of the second support portion 15.

  The first and second support parts 14 and 15 are connected to the connecting part 16 and are formed to have a uniform thickness dimension with a connecting part formed in a uniform thickness dimension and a thickness dimension smaller than the connecting part. And a support portion in which the gripping members 11 and 12 are provided, and an intermediate portion that is interposed between the connection portion and the support portion and has a thickness dimension that decreases from the connection portion side toward the support portion side. As for the 1st and 2nd support parts 14 and 15, the surface part on the opposite side to the side in which the holding members 11 and 12 are provided is formed in a planar shape, and the surface part on the side in which the holding members 11 and 12 are provided is stepped. More specifically, the intermediate portion is formed in a stepped shape having a slope shape.

  The first and second support portions 14 and 15 are connected by the connecting portion 16 so as to be able to approach and displace in the displacement direction Z. By causing the first and second support portions 14 and 15 to move closer to or away from each other in the displacement direction Z by the connecting portion 16, the pair of gripping members 11 and 12 move closer to or away from each other in the displacement direction Z. The support means 13 is controlled by a control means (not shown).

The gripping pressure applied to the surface portions 20a and 20b of the optical sheet laminate 20 by the gripping members 11 and 12 is 1 N / cm 2 or more and 3 N / cm 2 or less. The gripping pressure by the gripping members 11 and 12 is not limited to the above range, but is preferably 1 N / cm 2 or more and 3 N / cm 2 or less as in the present embodiment. The gripping pressure by the gripping members 11 and 12 is controlled by the control means via the support means 13.

  In the present embodiment, the optical sheet laminate 20 has a four-sheet configuration in which four optical sheets 21 to 24, that is, a first diffusion sheet 21, a first prism sheet 22, a second prism sheet 23, and a second diffusion sheet 24 are laminated. It is. When the four optical sheets 21 to 24 are held by the holding device 1, one of the displacement directions Z in the order of the first diffusion sheet 21, the first prism sheet 22, the second prism sheet 23, and the second diffusion sheet 24. The layers are stacked from the Z1 side toward the other Z2 side. That is, the first diffusion sheet 21, the first prism sheet 22, the second prism sheet 23, and the second diffusion sheet 24 are arranged in this order from vertically upward to downward. The surface portion on the one Z1 side in the thickness direction of the first diffusion sheet 21 constitutes the one-side contact surface portion 20a that is the surface portion on the one Z1 side in the thickness direction of the optical sheet laminate 20, and the thickness of the second diffusion sheet 24 The surface part on the other side Z2 side in the direction constitutes the other side contact surface part 20b that is the surface part on the other side Z2 in the thickness direction of the optical sheet laminate 20.

  The types of optical sheets, the order of stacking, and the number of stacked sheets are not limited to this. For example, the first diffusion sheet 21, the first prism sheet 22, and the second prism sheet 23 without the second diffusion sheet 24 being provided. The second prism sheet 23 may have a light diffusion function. Alternatively, the first diffusion sheet 21, the first prism sheet 22, and the second diffusion sheet 24 may be laminated without providing the second prism sheet 23.

  FIG. 2 is an exploded perspective view showing the optical sheet laminate 20 in an exploded manner. Each of the first diffusion sheet 21 and the second diffusion sheet 24 has diffusion layers 21a and 24a on one surface of the sheet-like base substrates 21b and 24b, specifically, one surface in the displacement direction Z1 side. It is formed and has a predetermined light diffusion function. 1 and 2, the diffusion layers 21a and 24a are shown with hatching. A resin film having translucency is used for the base substrates 21b and 24b, and polyethylene terephthalate (abbreviated as PET) and polycarbonate (PC) are preferable as the material of the resin film. In this embodiment, the diffusion layers 21a and 24a are configured by beads that are bonded and fixed to the base substrates 21b and 24b, and the beads have a function of diffusing light. For the beads, for example, resin particles having translucency are used. The diffusion layers 21a and 24a are not limited to this and may have any function of diffusing light. In the present embodiment, the first and second diffusion sheets 21 and 24 are diffusion sheets whose base substrates 21b and 24b are PET films made of PET.

  In the first prism sheet 22 and the second prism sheet 23, prism layers 22a and 23a are formed on the surface on one side of the sheet-like base substrates 22b and 23b, specifically on the surface on the one side in the displacement direction Z1 side. Thus, it has a condensing function to one side Z1 in the front direction, that is, the displacement direction Z that is vertically upward. The prism layers 22a and 23a include a plurality of prisms 25 and 26 protruding to one side in the thickness direction. Each of the prisms 25 and 26 corresponds to a protrusion and protrudes to one side in the thickness direction of the optical sheet laminate 20. Each prism 25, 26 is formed with two planar emission surfaces. The two exit surfaces are planes inclined from a surface perpendicular to the one side surface of the base base materials 22b and 23b, and are parallel to the one side surface of the base base materials 22b and 23b as the distance from the one side surface of the base base materials 22b and 23b increases. The cross-sectional area is formed to be small.

  In the present embodiment, the prism 25 of the first prism sheet 22 has a triangular shape arranged on a plane perpendicular to the first direction X which is a direction perpendicular to the displacement direction Z parallel to the thickness direction of the optical sheet laminate 20. It has a triangular prism shape extending along one direction X, and the two exit surfaces are formed with the same dimensions. The prism 26 of the second prism sheet 23 is perpendicular to the displacement direction Z parallel to the thickness direction of the optical sheet stack 20 and is perpendicular to the second direction Y, which is the direction perpendicular to the first direction X. The triangular shape is formed by extending the arranged triangles along the second direction Y, and the two exit surfaces are formed with the same dimensions. The first prism sheet 22 and the second prism sheet 23 are stacked so that the directions of the prisms 25 and 26, that is, the directions of the tops of the triangular prisms constituting the prisms 25 and 26 are substantially orthogonal to each other.

  As with the first diffusion sheet 21 and the second diffusion sheet 24, a light-transmitting resin film is used for the base substrates 22b and 23b, and PET is suitable as a material for the resin film. The material constituting the prism layers 22a and 23a is also a translucent resin, and a polymethyl methacrylate (abbreviated as PMMA) resin is preferable. As a method of manufacturing the first and second prism sheets 22 and 23, a method of forming the concave and convex shapes of the prism layers 22a and 23a on the base base materials 22b and 23b with a transfer roller is used. In the present embodiment, the first and second prism sheets 22 and 23 are PET films in which the base substrates 22b and 23b are made of PET, and the prism layers 22a and 23a are prism sheets made of PMMA.

  In the optical sheet laminate 20, the first diffusion sheet 21 is laminated on the surface portion on one side in the thickness direction of the first prism sheet 22 via the prism 25 formed on the first prism sheet 22. Are stacked on the surface portion on one side in the thickness direction of the second prism sheet 23 via the prism 26 formed on the second prism sheet 23. Accordingly, the first diffusion sheet 21 corresponds to the second optical sheet, the first prism sheet 22 corresponds to the first and second optical sheets, and the second prism sheet 23 corresponds to the first optical sheet. To do.

  FIG. 3 is a diagram for explaining a gripping operation by the gripping device 1 according to the embodiment of the present invention. The optical sheet laminate 20 described above is obtained by laminating optical sheets 21 to 24 having dimensions capable of punching a plurality of optical sheet laminates 20 and punching them into a predetermined shape. The laminated optical sheets 21 to 24, that is, the optical sheet laminated body 20 are punched into a predetermined shape while being laminated and then supplied to the optical sheet laminated body 20 while being fixed to the conveying sheet 31. Is conveyed to the position of the gripping device 1.

  The optical sheet laminate 20 is fixed to the conveyance sheet 31 by a slight force such as an adhesive force on the surface of the conveyance sheet 31. Therefore, when the punching scraps of the transport sheet 31 and the stacked optical sheets 21 to 24 are taken up by the take-up roller 32 at the supply position of the optical sheet stack 20, the punched optical sheet stack 20 is transported. Without following the sheet 31 and the punched residue, the state of protruding from the portion of the take-up roller 31 toward the gripping device 1 is obtained. The surface portions 20a and 20b on both sides in the thickness direction Z of the protruding optical sheet laminate 20 are sandwiched by the gripping device 1 and transferred to the next process.

  As described above, according to the gripping device 1 of the present embodiment, the optical sheet laminate 20 is gripped from both sides in the thickness direction by the pair of gripping members 11 and 12 that are displaced toward and away from each other in the displacement direction Z by the support means 13. Is done. Accordingly, the optical sheet laminate 20 can be held as a unit without being integrated by means such as joining the optical sheets 21 to 24 constituting the optical sheet laminate 20.

  As shown in FIG. 1 described above, when gripping the front and back surfaces of the optical sheet laminate 20, that is, sandwiching the surface portions 20 a and 20 b on both sides in the thickness direction, the gripping members 11 and 12 are front and back surfaces of the optical sheet laminate 20. By contacting 20a, 20b, the front and back surfaces 20a, 20b of the optical sheet laminate 20 may be damaged.

  Since the optical sheet laminate 20 includes the first and second prism sheets 22 and 23, the optical sheet laminate 20 is laminated on the first and second prism sheets 22 and 23 by the tops of the prisms 25 and 26, that is, the prism peaks 25A and 26A. The back surfaces of the optical sheets 21 and 22, that is, the surface portion on the other Z2 side in the thickness direction may be damaged.

  FIG. 4 is a diagram for explaining a mechanism in which scratches are generated on the back surface of the optical sheet by the prism peaks 25A and 26A. FIG. 4 shows the gripping device 1 in a simplified manner. FIG. 4 is a front view of the gripping device 1 as viewed from the front side, that is, from one side in the second direction Y. FIG. 4A is a diagram illustrating a state in which the prism peaks 25A and 26A are not biting, and FIG. 4B is a diagram illustrating a state in which the prism peaks 25A and 26A are biting.

  The pressure applied to the gripping members 11 and 12, that is, the gripping pressure, is concentrated on the prism peaks 25A and 26A. In FIG. 4, the magnitude of the gripping pressure is represented by the number of arrows, and the greater the number of arrows, the greater the gripping pressure. If the gripping pressure is appropriate, the prism peaks 25A and 26A do not bite as shown in FIG. 4A, so that the optical sheets 21 and 22 stacked on the first and second prism sheets 22 and 23 The back surface, that is, the base materials 21b and 22b of the first diffusion sheet 21 and the second prism sheet 22 are not damaged.

  On the other hand, if the gripping pressure is not appropriate, the prism peaks 25A and 26A are bitten as shown in FIG. 4B, and the optical sheets 21 and 22 stacked on the first and second prism sheets 22 and 23 are formed. Scratches occur on the back side. Thus, the pressure applied to the holding members 11 and 12 is concentrated on the prism peaks 25A and 26A, and the optical sheets 21 and 22 stacked on the prism peaks 25A and 26A side, that is, the first diffusion sheet 21 and the first prism sheet. The prism bases 25A and 26A bite into the 22 base base materials 21b and 22b, so that scratches may occur and the functions of the optical sheets 21 and 22 may be impaired.

  In the present embodiment, the contact surface portions 11a and 12a that contact the optical sheet laminate 20 of the gripping members 11 and 12 are made of an elastic material, and the durometer hardness defined in JIS K6253 is A50 or less. It is possible to prevent the gripping members 11 and 12 from damaging the surface portions 20a and 20b on both sides in the thickness direction, which are the surface portions that contact the gripping members 11 and 12 of the optical sheet laminate 20. In addition, since the gripping pressure when the pair of gripping members 11 and 12 grips the optical sheet laminate 20 can be prevented from being concentrated on the prism peaks 25A and 26A, the first and second prism sheets 22, 23 can prevent the back surfaces of the optical sheets 21 and 22 stacked on the optical disc 23 from being damaged by the prism peaks 25A and 26A of the first and second prism sheets 22 and 23, and the prism peaks 25A and 26A can be deformed. Can be prevented. Therefore, the optical sheet laminate 20 can be gripped without damaging the optical sheets 21 to 24 constituting the optical sheet laminate 20.

  When the durometer hardness of the contact surface portions 11a and 12a of the gripping members 11 and 12 exceeds A50, the optical sheets 21 and 24 are attached to the gripping members 11 and 12 and the gripping members to the optical sheets 21 and 24 are attached. 11 and 12 are likely to be transferred. In addition, since the elastic deformation of the contact surface portions 11a and 12a of the gripping members 11 and 12 is unlikely to occur, foreign matter such as prism sheet waste generated during punching between the gripping members 11 and 12 and the optical sheet laminate 20 is obtained. When this occurs, the gripping pressure tends to concentrate on the prism peaks 25A and 26A. Therefore, the back surfaces of the optical sheets 21 and 22 stacked on the first and second prism sheets 22 and 23 are easily damaged by the prism peaks 25A and 26A, and the prism peaks 25A and 26A are easily deformed. Therefore, it is preferable that the durometer hardness of the contact surface portions 11a and 12a of the gripping members 11 and 12 is A50 or less as in this embodiment.

  The lower limit value of the durometer hardness of the contact surface portions 11a and 12a of the gripping members 11 and 12 varies depending on the material of the contact surface portions 11a and 12a. When the contact surface portions 11a and 12a of the gripping members 11 and 12 are made of nitrile rubber as in the present embodiment, the durometer hardness of the contact surface portions 11a and 12a of the gripping members 11 and 12 is A30. It is preferable that it is above A50. If the contact surface portions 11a and 12a are made of nitrile rubber having a durometer hardness of less than A30, the optical sheets 21 to 24 may stick to the gripping members 11 and 12. The contact surface portions 11a and 12a of the gripping members 11 and 12 are formed of nitrile rubber having a durometer hardness of A30 or more and A50 or less, thereby preventing the optical sheets 21 to 24 constituting the optical sheet laminate 20 from being damaged. At the same time, it is possible to prevent the optical sheets 21 and 24 from being attached to the gripping members 11 and 12 and the transfer of the gripping members 11 and 12 to the optical sheets 21 and 24. Therefore, the gripping operation of the optical sheet laminate 20 can be performed more stably.

In this embodiment, the optical sheet laminate 20 is gripped by the gripping members 11 and 12 with a gripping pressure of 1 N / cm 2 or more and 3 N / cm 2 or less. Thereby, it can prevent more reliably that the surface parts 20a and 20b of the thickness direction both sides of the optical sheet laminated body 20 are damaged by the holding members 11 and 12. FIG. When the optical sheet laminate 20 is gripped and transferred, the optical sheets 21 to 24 constituting the optical sheet laminate 20 can be more reliably prevented from being displaced, and the optical sheet laminate 20 can be transferred more stably. Is possible.

When the gripping pressure by the gripping members 11 and 12 is less than 1 N / cm 2 , the static friction force against the contact surface portions 20a and 20b of the optical sheet laminate 20 becomes too small, and the optical sheet laminate 20 is stably held. It may not be possible. In order to stably hold the optical sheet laminate 20, the static friction force of the gripping members 11 and 12 against the contact surface portions 20a and 20b of the optical sheet laminate 20 is preferably 1.6 N or more.

  That is, the gripping pressure by the gripping members 11 and 12 is such that the static frictional force between the contact surface portions 11a and 12a of the gripping members 11 and 12 and the contact surface portions 20a and 20b of the optical sheet laminate 20 is 1.6 N or more. It is preferable to be selected so that When the static frictional force between the contact surface portions 11a and 12a of the gripping members 11 and 12 and the contact surface portions 20a and 20b of the optical sheet laminate 20 is less than 1.6 N, the optical sheet laminate 20 is stably provided. There is a possibility that it cannot be gripped. Further, when the optical sheet laminate 20 is gripped and transferred, the optical sheets 21 to 24 may be displaced. By selecting the gripping pressure so that the static frictional force between the contact surface portions 11a, 12a of the gripping members 11, 12 and the contact surface portions 20a, 20b of the optical sheet laminate 20 is 1.6 N or more, the optical sheet The laminate 20 can be gripped stably. Further, when the optical sheet laminate 20 is gripped and transferred, the optical sheet laminate 20 can be stably transferred without causing a shift between the optical sheets 21 to 24 constituting the optical sheet laminate 20. It is.

If the gripping pressure by the gripping members 11 and 12 exceeds 3 N / cm 2 , the gripping members 11 and 12 may cause damage to the contact surface portions 20 a and 20 b of the optical sheet laminate 20. Further, there is a risk that scratches due to the prism peaks 25A and 26A on the back surfaces of the optical sheets 21 and 22 stacked on the first and second prism sheets 22 and 23 and deformation of the prism peaks 25A and 26A may occur. Therefore, the gripping pressure by the gripping members 11 and 12 is preferably 1 N / cm 2 or more and 3 N / cm 2 or less.

  Moreover, in this embodiment, each holding member 11 and 12 has the holding area with respect to the optical sheet laminated body 20, and the total area of the surface of the contact surface parts 20a and 20b which contact | abut to the holding members 11 and 12 of the optical sheet laminated body 20 Of less than 50%.

  When the optical sheets 21 to 24 are taken out in a stacked state after being punched into a predetermined shape in a state where a plurality of optical sheets 21 to 24 are stacked as in the present embodiment, for example, as shown in FIG. As described above, when the optical sheets 21 to 24 are stacked with the conveying sheet 31 and fed, and the conveying sheet 31 is folded back at an appropriate curvature radius R and angle, the optical sheet laminate that has been slightly adhered and fixed to the conveying sheet 31 20 is peeled off from the conveying sheet 31 by the rigidity of each of the optical sheets 21 to 24 and protrudes at a bent portion (hereinafter also referred to as “R portion”) 33 that is a folded portion of the conveying sheet 31. . When the protruding amount of the optical sheet laminate 20 is 50% or more of the total area of the contact surface portions 20a and 20b of the optical sheet laminate 20, the center of gravity of the optical sheet laminate 20 reaches the R portion 33. The optical sheets 21 to 24 may be displaced due to the influence of gravity.

  The shift between the optical sheets 21 to 24 due to the influence of the gravity is equal to 50 of the total area of the surfaces of the contact surface portions 20a and 20b of the optical sheet laminate 20 as in the present embodiment. It can prevent by making it less than%. Further, the gripping area is set to be less than 50% of the total surface area of the contact surface portions 20a and 20b of the optical sheet laminate 20, and the optical sheet is laminated in a region where the first gripping member 11 and the second gripping member 12 face each other. By preventing the position of the center of gravity of the body 20 from being included, it is possible to more reliably prevent the optical sheets 21 to 24 from being displaced due to the influence of gravity.

  Further, as described above, the holding area of the holding members 11 and 12 is less than 50% of the total area of the contact surface portions 20a and 20b of the optical sheet laminate 20, so that the optical sheet laminate 20 taken out after punching is obtained. When gripping and transferring between processes, delivery to the apparatus of the next process can be easily performed. Further, when transferring to the next step, it is preferable because the mechanism, the gripping member, the gripping pressure, etc. of the gripping device on the receiving side can be made common.

  The gripping area of the optical sheet laminate 20 by the gripping members 11 and 12 is more preferably 5% or more and less than 50% of the total area of the surfaces of the contact surface portions 20a and 20b of the optical sheet laminate 20. If the gripping area is less than 5% of the total surface area of the contact surface portions 20a and 20b of the optical sheet laminate 20, the optical sheet laminate 20 may not be stably gripped.

  In the present embodiment, the contact surface portions 11 a and 12 a of the pair of gripping members 11 and 12 are formed symmetrically with respect to a virtual plane that is perpendicular to the displacement direction Z. FIG. 5 is a diagram for explaining the arrangement of the gripping members 11 and 12. FIG. 5 is a front view showing a part of the gripping device 1. FIG. 5A shows the arrangement state of the gripping members 11 and 12 according to the present embodiment, that is, the contact surface portions 11a and 12a of the pair of gripping members 11 and 12 are formed symmetrically with respect to a virtual plane perpendicular to the displacement direction Z. FIG. 5B is a diagram illustrating a case where the pair of gripping members 11 and 12 are not formed symmetrically with respect to the virtual plane.

  As shown in FIG. 5B, the pair of gripping members 11, 12 are not in positions facing each other, that is, the contact surface portions 11 a, 12 a of the pair of gripping members 11, 12 are perpendicular to the displacement direction Z. When it is not formed symmetrically with respect to one plane, there is a possibility that the gripping pressure is locally applied and the optical sheet laminate 20 is deformed. When the optical sheet laminate 20 is deformed, the gripping pressure is concentrated on the ends of the gripping members 11 and 12, and the contact surface portions 20a and 20b of the optical sheet laminate 20 or the first and second prism sheets 22 and 23 are concentrated. The possibility of damaging the laminated optical sheets 21 and 22 is increased, which is not preferable.

  As shown to Fig.5 (a), in this embodiment, a pair of holding | grip members 11 and 12 contact | abutted to the front and back of the optical sheet laminated body 20 comprised by the laminated | stacked several optical sheets 21-24 are comprised. It is provided in the position which mutually opposes, and the shape and area of the part which contacts the optical sheet laminated body 20 are substantially the same. That is, the contact surface portions 11a and 12a of the pair of gripping members 11 and 12 are formed symmetrically with respect to a virtual plane that is perpendicular to the displacement direction Z. As a result, the gripping pressure by the gripping members 11 and 12 can be uniformly applied to the contact surface portions 20a and 20b of the optical sheet laminate 20, so that the gripping pressure is locally applied to the optical sheet laminate 20. Can be prevented. Therefore, it is possible to prevent the optical sheet laminate 20 that receives the gripping pressure from being deformed or curved by receiving a local pressure at the ends of the gripping members 11 and 12.

  FIG. 6 is a side view showing the conveyance-side pressing mechanism 40. As described above, the laminated optical sheets 21 to 24, that is, the optical sheet laminated body 20, are punched into a predetermined shape while being laminated, and then fixed to the transport sheet 31. It is conveyed to the position of the gripping device 1 that is the supply position of the body 20. Since the optical sheet laminated body 20 after punching is surrounded by a punching residue, the optical sheets 21 to 24 constituting the optical sheet laminated body 20 are unlikely to be displaced, but the optical sheets 21 to 21 In order to prevent misalignment between 24 and reliably convey the optical sheet laminate 20, as shown in FIG. 6, the optical sheet laminate 20 is moved from the opposite side of the conveyance sheet 31, that is, from one Z1 side in the thickness direction. It is preferable to provide a conveyance side pressing mechanism 40 for pressing.

  The conveyance-side pressing mechanism 40 includes a roll-shaped pressing member (hereinafter referred to as “pressing roll”) 41. The pressing roll 41 is disposed at a position that does not interfere with the operation of the gripping device 1. A plurality of, for example, four pressing rolls 41 are provided. The number of pressing rolls 41 is not limited to four, and may be one. The pressing roll 41 is supported by support means (not shown) so as to be rotatable about an axis parallel to the first direction X and parallel to the axis of the take-up roller 31. The pressing roll 41 is provided so as to be in contact with the one-side contact surface portion 20 a that is the surface portion on the one side Z <b> 1 side in the thickness direction of the optical sheet laminate 20, and the optical sheet laminate 20 is moved by the rotational driving of the winding roller 31. Accordingly, the winding roller 31 rotates in the direction opposite to the rotation direction. The four pressing rolls 41 are provided at intervals in the second direction Y.

  A gripping mechanism 30 is configured including the gripping device 1 and the conveyance-side pressing mechanism 40. According to the gripping mechanism 30, the optical sheet stack 20 is pressed from the opposite side of the transport sheet 31 by the transport-side pressing mechanism 40, so that the optical sheets 21 to 24 jump out from the punched portion to the gripping device 1 side. It is possible to prevent the optical sheet laminate 20 from being moved to the side, that is, between the punched optical sheet laminates 20. That is, the shift between the optical sheets 21 to 24 can be prevented. Therefore, it is possible to grip the optical sheet laminate 20 with the gripping device 1 in a state where the optical sheet laminate 20 is punched out, that is, in a state where the end portions of all the optical sheets 21 to 24 are aligned. In the example illustrated in FIG. 6, the pressing member 41 has a roll shape, but is not limited thereto, and may be, for example, a plate shape or a rope shape.

  FIG. 7 is a side view showing the supply side pressing mechanism 45. As described above, at the position of the gripping device 1 that is the supply position of the optical sheet laminate 20, the punched optical sheet laminate 20 protrudes from the take-up roller 31 portion to the gripping device 1 side. At this time, the protruding portion of the optical sheet laminate 20 may warp or sag due to warpage of the optical sheets 21 to 24 or gravity. In order to prevent warping and sagging of the protruding portion, as shown in FIG. 7, the positions on the upper side and the lower side of the optical sheet laminate 20 at the supply position, that is, the positions on both sides in the thickness direction of the optical sheet laminate 20, It is desirable to arrange a supply side pressing mechanism 45 that holds the optical sheet laminate 20.

  The supply-side pressing mechanism 45 includes a pair of first pressing pads 46 that press the optical sheet laminate 20 from one side in the thickness direction Z1, and a pair of second pressing pads 47 that press the optical sheet stack 20 from the other side Z1 in the thickness direction. including. The first and second pressing pads 46 and 47 are disposed at positions that do not interfere with the operation of the gripping device 1. Specifically, the pair of first pressing pads 46 are provided on the side of the first gripping member 11 in the first direction X, more specifically, on the side of the first support portion 14. Further, the pair of second pressing pads 47 are provided on the side of the second gripping member 12 in the first direction X, more specifically, on the side of the second support portion 15. The first and second pressing pads 46 and 47 are supported by support means (not shown).

  A gripping mechanism 30 </ b> A is configured including the gripping device 1 and the supply-side pressing mechanism 45. According to the gripping mechanism 30A, the protruding portion of the optical sheet laminate 20 can be prevented from warping or dripping by pressing the optical sheet laminate 20 from both sides in the thickness direction by the supply side pressing mechanism 45. Thereby, the whole optical sheet laminated body 20 can be hold | gripped more reliably. The gripping mechanism 30 </ b> A may include the conveyance-side pressing mechanism 40 shown in FIG. 6 described above together with the supply-side pressing mechanism 45.

  FIG. 8 is a view for explaining a cross-sectional shape of the gripping member. FIG. 8 is a front view showing a part of the gripping devices 1 and 1A. FIG. 8 shows only one gripping member 11, 110 of the pair of gripping members. The other gripping member is formed in the same manner as the one gripping member 11, 110. FIG. 8A is a diagram illustrating the gripping member 11 according to the present embodiment, and FIG. 8B is a diagram illustrating the gripping member 110 having an outer peripheral edge formed in a curved shape.

  As shown to Fig.8 (a), in this embodiment, the outer peripheral edge part of the contact surface part 11a of the holding member 11 is square shape, and it is not curved. That is, the curved surface portion is not formed on the outer peripheral edge portion of the contact surface portion 11 a of the grip member 11. Therefore, in the cross section in a virtual plane parallel to the displacement direction Z of the gripping member 11, the outer peripheral edge of the gripping member 11, at least the end portion 100 of the portion in contact with the optical sheet laminate 20, is not a curved shape but a square shape. It has become. In this case, there is a possibility that the optical sheet laminate 20 or each of the optical sheets 21 to 24 may be scratched at the end portion 100 of the gripping member 11.

  In the gripping member 110 shown in FIG. 8B, the outer peripheral edge of the gripping member 110, at least the end of the portion in contact with the optical sheet laminate 20, is formed in a curved surface shape. That is, a curved surface portion 111 is formed at the end of the gripping member 110. Therefore, in the cross section perpendicular to the contact surface between the optical sheet laminate 20 and the gripping member 110, that is, the cross section in a virtual plane parallel to the displacement direction Z, at least the outer peripheral edge of the gripping member 110, at least the optical sheet laminate 20 The end portion 111 of the portion that comes into contact with is curved. As a result, the optical sheet laminate 20 or each of the optical sheets 21 to 24 that receives the gripping pressure is deformed following the curved surface shape of the gripping member 110, so that each of the optical sheets 21 to 24 is scratched like a fold. Can be prevented. Therefore, it is preferable that the outer peripheral edge part of the contact surface part of a pair of holding members 11 and 12 is formed in a curved surface shape as shown in FIG.

  In addition, the gripping position by the gripping members 11 and 12 of the gripping device 1 is desirably a portion as far as possible from the end of the optical sheet laminate 20. The punching waste generated when the optical sheet laminate 20 is punched easily adheres to the end portion of the optical sheet laminate 20, and becomes less likely to adhere as the distance from the end portion increases. According to the gripping device 1 of the present embodiment, the optical sheets 21 to 24 are not damaged even when gripped in a state where punching dust is attached, but when the optical sheet laminate 20 is gripped in a state where punching dust is attached, the gripping member The punching dust is transferred to the 11th and 12th sides, and the transferred foreign matter may fall off as the gripping operation is repeated. The punched scraps that have fallen off are not preferable because they may secondarily make other products defective. Therefore, it is desirable that the gripping position by the gripping members 11 and 12 is as far as possible from the end of the optical sheet laminate 20.

  In the present embodiment described above, the gripping position by the gripping members 11 and 12 is a single location, but it is not necessary to be a single location, and a plurality of locations are desirable. By setting the gripping positions to a plurality of locations, it is possible to more reliably prevent the optical sheets 21 to 24 constituting the optical sheet laminate 20 from shifting in the direction of rotation about the gripping position.

  Moreover, in the above embodiment, the elastic material which comprises the holding members 11 and 12 is a nitrile rubber. The elastic material constituting the gripping members 11 and 12 is not limited to this, but may be other elastic materials such as butyl rubber, ethylene-propylene-diene (abbreviated as EPDM) rubber, or chloroprene rubber. Thus, nitrile rubber is preferable. If the gripping members 11 and 12 are made of an elastic material other than nitrile rubber, the optical sheets 21 and 24 may be attached to the gripping members 11 and 12 and the transfer of the gripping members 11 and 12 to the optical sheets 21 and 24 may occur. There is. By configuring the gripping members 11 and 12 with nitrile rubber, the optical sheets 21 and 24 are stuck to the gripping members 11 and 12 and the transfer of the gripping members 11 and 12 to the optical sheets 21 and 24 is prevented. The gripping operation of the stacked body 20 can be performed more stably.

Example 1
As the gripping members 11 and 12, a gripping device provided with a gripping member made of nitrile rubber having a durometer hardness of A30 was prepared.

(Example 2)
A gripping device including a gripping member made of nitrile rubber was prepared in the same manner as in Example 1 except that a nitrile rubber having a durometer hardness of A50 was used.

(Example 3)
A gripping device including a gripping member made of nitrile rubber was prepared in the same manner as in Example 1 except that nitrile rubber having a durometer hardness of A20 was used.

Example 4
A gripping device including a gripping member made of butyl rubber was prepared in the same manner as in Example 1 except that butyl rubber having a durometer hardness of A50 was used instead of nitrile rubber.

(Example 5)
A gripping device including a gripping member made of EPDM rubber was prepared in the same manner as in Example 1 except that ethylene-propylene-diene (abbreviated as EPDM) rubber having durometer hardness A50 was used instead of nitrile rubber.

(Example 6)
A gripping device including a gripping member made of chloroprene rubber was prepared in the same manner as in Example 1 except that chloroprene rubber having a durometer hardness of A50 was used instead of nitrile rubber.

(Comparative Example 1)
A gripping member made of MC nylon is provided in the same manner as in Example 1 except that instead of nitrile rubber, a monomer cast (abbreviated as MC) nylon of Rockwell hardness R120 defined in JIS B7730, which is a hard material, is used. A gripping device was prepared.

(Comparative Example 2)
Grasping made of ultrahigh molecular weight PE in the same manner as in Example 1 except that ultra-high molecular weight polyethylene (abbreviated as PE) having Rockwell hardness R56 defined in JIS B7730 is used instead of nitrile rubber. A gripping device provided with a member was prepared.

(Comparative Example 3)
A gripping device including a gripping member made of nitrile rubber was prepared in the same manner as in Example 1 except that a nitrile rubber having a durometer hardness of A70 was used.

<Evaluation 1>
Regarding the gripping devices of Examples 1 to 3 and Comparative Examples 1 and 3, a four-sheet configuration in which a first diffusion sheet 21, a first prism sheet 22, a second prism sheet 23, and a second diffusion sheet 24 are laminated as optical sheets. The front and back surfaces of the optical sheet laminate 20 were sandwiched between the gripping members 11 and 12, and the gripping pressure was changed to check whether or not the optical sheet was displaced when transported. The results are shown in Table 1. In Table 1, the symbol “◯” indicates that there was no displacement of the optical sheet, and the symbol “x” indicates that there was displacement of the optical sheet. The numbers in each column of Table 1 indicate the static frictional force between the gripping members 11 and 12 and the optical sheet laminate 20 obtained by each gripping pressure. The static friction force was measured as follows.

<Measuring method of static friction force>
As shown in FIG. 1, the optical sheet laminate 20 is gripped by a pair of gripping members 11 and 12 from both sides in the thickness direction. The gripping positions by the gripping members 11 and 12 were set so that the gripping members 11 and 12 were symmetric with respect to the center line between both ends in the first direction X of the optical sheet laminate 20. The gripping area at this time was 1 cm 2 and the gripping pressure could be set to an arbitrary value. Further, the end of the optical sheet laminate 20 opposite to the portion gripped by the gripping members 11 and 12 (hereinafter referred to as “gripping portion”) is gripped by using another gripping jig from both sides in the thickness direction. Although the gripping pressure by the gripping jig is not set, the optical sheets 21 to 24 of the optical sheet laminate 20 are prevented from shifting by being firmly tightened and fixed with bolts and nuts. The holding by the holding jig was performed so as to cover the entire width of the optical sheet laminate 20 in the first direction X. In a state in which the gripping pressure at the gripping portion of the optical sheet laminate 20 is set to an arbitrary value, the direction is parallel to the gripping surface by the gripping members 11 and 12 and the first direction X of the optical sheet stack 20 The gripping jig is gently pulled to the opposite side of the gripping members 11 and 12 in the direction along the center line. The tensile force when the optical sheet laminate 20 was displaced was measured with a digital force gauge (manufactured by Nidec Sympo Co., Ltd., model FGP-1 and FGP-10), and this value was defined as a static frictional force.

  From the results in Table 1, it was found that the static friction force by the gripping member is preferably 1.6 N or more in order to stably transport the optical sheet laminate 20 without shifting.

<Evaluation 2>
Regarding the gripping devices of Examples 1 to 6 and Comparative Examples 1 to 3, a four-layer optical sheet stack in which a first diffusion sheet 21, a first prism sheet 22, a second prism sheet 23, and a second diffusion sheet 24 are stacked. The front and back surfaces of the body 20 are sandwiched between the gripping members 11 and 12, the front and back surfaces of the optical sheet laminate 20 are not damaged, and the back surfaces of the optical sheets 21 and 22 stacked on the prism peaks 25A and 26A side. The presence or absence was evaluated. The gripping area was 1 cm 2 and repeated evaluations were performed while changing the gripping pressure. The above evaluation results are shown in Table 2.

  In addition, with respect to the gripping devices of Examples 1 to 3 and Comparative Examples 1 and 3, the gripping part that is gripped by the gripping members 11 and 12 is on the optical sheet laminate 20, that is, one side contact of the optical sheet laminate 20. A similar experiment was performed with prism sheet scraps arranged on the surface portion 20a. In some cases, foreign matter may adhere to the optical sheet laminate 20 at the gripping portion. As a typical foreign material, there is prism sheet waste generated at the time of punching, for example. Therefore, the above-described experiment was performed by artificially arranging the prism sheet waste on the optical sheet laminate 20 at the gripping portion. The above evaluation results are shown in Table 3.

  In Table 2 and Table 3, the symbol “◯” indicates that there was no change in the optical sheet laminate before and after gripping, and the symbol “X” indicates that the back surface of the optical sheets 21 and 22 laminated on the prism peak side is scratched. The symbol “Δ” indicates that there was deformation of the prism crest, and the symbol “●” indicates that there is transfer contamination on the front and back surfaces of the optical sheet laminate 20 by the holding members 11, 12. The symbol “■” indicates that the optical sheet is attached to the gripping members 11 and 12.

As shown in Table 2, in the case of Comparative Examples 1 and 2 in which the gripping members 11 and 12 are made of MC nylon or superpolymer PE, the front and back surfaces of the optical sheet laminate 20 are scratched when the gripping pressure is 40 N / cm 2 or less. Was not observed, and scratches were observed when the gripping pressure was 50 N / cm 2 or more. The scratches on the back of the optical sheet 21 laminated on the prism mountain is gripping pressure were not observed in 3N / cm 2 or less, it was to be observed at 5N / cm 2 or more.

Further, as shown in Table 3, by using MC nylon or superpolymer PE for the gripping members 11 and 12 as in Comparative Examples 1 and 2, prism sheet waste is artificially formed on the optical sheet laminate 20 at the gripping portion. When placed and gripped, scratches are observed on the front and back surfaces of the optical sheet laminate 20 even when the gripping pressure is 3 N / cm 2 , and scratches on the optical sheet back surfaces 21 and 22 stacked on the prism crest side are 1 N / cm 2. Observed.

As shown in Table 1 above, in the case of Comparative Example 1 in which MC nylon is used for the gripping members 11 and 12, when the gripping pressure is 3 N / cm 2 or less, the static frictional force is 1.2 N, and the optical sheet laminate The optical sheet laminate 20 may be displaced when transferring 20, but the static frictional force when the gripping pressure is 4 N / cm 2 is 1.6 N, and when the gripping pressure is 4 N / cm 2 or more, the optical sheet The laminate 20 could be transferred stably. Comparative Example 2 using superpolymer PE for gripping members 11 and 12 was evaluated in the same manner as in Evaluation 1. As in Comparative Example 1 in which MC nylon was used for gripping members 11 and 12, the gripping pressure was 3N. / static friction force when the cm 2 is 1.2 N, the static friction force when the gripping pressure is 4N / cm 2 is 1.6N, and the long gripping pressure 4N / cm 2 or more, the optical sheet laminated body 20 Could be transported stably. Therefore, when a hard material such as MC nylon or ultra high molecular weight PE is used for the gripping members 11 and 12 as in Comparative Examples 1 and 2, in order to stably transport the optical sheet laminate 20, gripping pressure is used. It can be seen that is required to be 4 N / cm 2 or more.

However, as shown in Table 3 above, when the prism sheet waste is artificially arranged and gripped on the optical sheet laminate 20 of the grip portion, even if the gripping pressure is 1 N / cm 2 , the optical sheet laminate 20 Scratches on the front and back surfaces and scratches on the optical sheet back surfaces 21 and 22 laminated on the prism crest side occurred. Therefore, when a hard material such as MC nylon or ultra-high molecular weight PE is used for the gripping members 11 and 12, the front and back surfaces of the optical sheet laminate 20 are damaged even if there is a foreign object on the optical sheet laminate 20 at the grip portion. In addition, it was not possible to obtain a gripping pressure that can be stably transferred without causing a shift of the optical sheet laminate 20.

  On the other hand, when the rubber materials of Examples 1 to 6 are used for the gripping members 11 and 12, the front and back surfaces of the optical sheet laminate 20 are formed even if there is a foreign object on the optical sheet laminate 20 at the grip portion. It was possible to obtain a gripping pressure that can be stably transferred without being damaged and without causing a shift of the optical sheet laminate 20.

Among the rubber materials, in Comparative Example 3 using nitrile rubber having a durometer hardness of A70, the gripping pressure was 1 N / cm 2 or less, and the optical sheet was not damaged. However, when the gripping pressure was 1 N / cm 2 , the obtained static friction force was less than 1.6 N.

  From the above results, the gripping members 11 and 12 are made of a rubber material having a lower hardness than at least the material constituting the optical sheet laminate 20 and a relatively large static frictional force obtained for each gripping pressure. It has been found that butyl rubber, ethylene propylene rubber, chloroprene rubber, and nitrile rubber are particularly suitable.

Specifically, in Example 3 using nitrile rubber having a durometer hardness of A50, the gripping pressure was 3 N / cm 2 or less, and the optical sheet was not damaged. Further, when the gripping pressure was 3 N / cm 2 , the obtained static friction force was 5 N. In Example 1 using nitrile rubber having a durometer hardness of A30, the gripping pressure was 5 N / cm 2 or less, and the optical sheet was not damaged. When the gripping pressure was 5 N / cm 2 , the obtained static friction force was 9 N. When nitrile rubbers having durometer hardness of A30 and A50 in Examples 1 and 3 were used, a gripping pressure of 1 N / cm 2 or more was required to obtain a static friction force of 1.6 N or more.

In Example 2 using a nitrile rubber having a durometer hardness of A20, the gripping pressure was 5 N / cm 2 or less, and the optical sheet was not damaged. When the gripping pressure was 5 N / cm 2 , the obtained static friction force was 10 N. In the case of a nitrile rubber having a durometer hardness of A20, a gripping pressure of 0.5 N / cm 2 or more was necessary to obtain a static friction force of 1.6 N or more. However, when gripping at 0.5 N / cm 2 , there is a problem that the optical sheet sticks to the gripping member.

From the above results, using nitrile rubber as the gripping member, setting the durometer hardness of the nitrile rubber to A30 or more and A50 or less, and the gripping pressure to 1 N / cm 2 or more and 3 N / cm 2 or less, the optical part of the gripping part It was found that even if there is a foreign substance on the sheet laminate, the optical sheet laminate can be stably transported without damaging the front and back surfaces of the optical sheet laminate and without shifting the optical sheet laminate.

  Further, when a rubber material other than nitrile rubber is used as the gripping member, there are the following problems in this embodiment, and appropriate conditions cannot be obtained. When butyl rubber and ethylene propylene rubber were used as the gripping member, there was a problem that the optical sheet adhered to the gripping member. When chloroprene rubber was used, there was transfer contamination to the optical sheet.

It is a side view which shows the holding | grip apparatus 1 of one Embodiment of this invention. It is a disassembled perspective view which decomposes | disassembles and shows the optical sheet laminated body 20. FIG. It is a figure for demonstrating the holding | grip operation | movement by the holding | grip apparatus 1 of one Embodiment of this invention. It is a figure for demonstrating the mechanism in which a damage | wound generate | occur | produces on the optical sheet back surface by prism mountain 25A, 26A. It is a figure for demonstrating arrangement | positioning of the holding members 11 and 12. FIG. FIG. 6 is a side view showing a conveyance side pressing mechanism 40. 4 is a side view showing a supply side pressing mechanism 45. FIG. It is a figure for demonstrating the cross-sectional shape of a holding member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holding apparatus 11 1st holding member 12 2nd holding member 13 Support means 14 1st support part 15 2nd support part 16 Connection part 20 Optical sheet laminated body 21 1st diffuser sheet 22 1st prism sheet 23 2nd prism sheet 24 Second diffusion sheet

Claims (6)

  1. A first optical sheet on which a protruding portion protruding to one side in the thickness direction is formed, and a surface portion on one side in the thickness direction of the first optical sheet is laminated via the protruding portion formed on the first optical sheet. A gripping device for gripping the optical sheet laminate including the second optical sheet from both sides in the thickness direction,
    A pair of gripping members provided so as to be capable of moving toward and away from each other in a predetermined displacement direction, and gripping the optical sheet laminate;
    Supporting means for supporting the pair of gripping members so as to be able to move toward and away from each other in the displacement direction,
    The gripping device, wherein the abutting surface portion of each gripping member that abuts against the optical sheet laminate is made of an elastic material, and has a durometer hardness defined by Japanese Industrial Standard K6253 of A50 or less.
  2.   The gripping device according to claim 1, wherein a contact surface portion of each gripping member is made of nitrile rubber and has a durometer hardness defined by Japanese Industrial Standard K6253 of A30 or more and A50 or less.
  3. The gripping apparatus according to claim 1 or 2, wherein a gripping pressure applied to the surface portion of the optical sheet laminate by each gripping member is 1 N / cm 2 or more and 3 N / cm 2 or less.
  4.   Each gripping member is formed such that the surface area of the abutting surface portion is 5% or more and less than 50% of the total surface area of the surface portion of the optical sheet laminate with which the gripping member abuts. Item 4. The gripping device according to any one of Items 1 to 3.
  5.   The gripping device according to claim 1, wherein the contact surface portions of the pair of gripping members are formed symmetrically with respect to a virtual plane that is perpendicular to the displacement direction.
  6.   The gripping device according to any one of claims 1 to 5, wherein an outer peripheral edge portion of a contact surface portion of each gripping member is formed in a curved surface shape.
JP2008043640A 2008-02-25 2008-02-25 Gripping device Pending JP2009196813A (en)

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JP2008043640A JP2009196813A (en) 2008-02-25 2008-02-25 Gripping device
PCT/JP2009/053231 WO2009107590A1 (en) 2008-02-25 2009-02-23 Grasping device
CN200980106904XA CN101952089A (en) 2008-02-25 2009-02-23 Grasping device

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN102699924A (en) * 2012-06-01 2012-10-03 上海大学 Tail clamping handle mechanism of manipulator

Families Citing this family (2)

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Publication number Priority date Publication date Assignee Title
KR101184449B1 (en) * 2009-12-28 2012-09-21 제일모직주식회사 Patterned light guide panel, method for preparing thereof and lcd back light unit using the same
JP6254930B2 (en) * 2014-12-10 2017-12-27 ファナック株式会社 Gear gripping apparatus and method for gripping gears

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JPH02143189A (en) * 1988-11-24 1990-06-01 Shimadzu Corp Electron detector
JP2003020135A (en) * 2001-07-11 2003-01-21 Fuji Photo Film Co Ltd Sheet body handling device
JP2004017257A (en) * 2002-06-20 2004-01-22 Matsushita Electric Ind Co Ltd Part gripping device
JP2006347694A (en) * 2005-06-15 2006-12-28 Nisca Corp Sheet bundle conveyance device and bookbinding device using the same
JP2007118148A (en) * 2005-10-31 2007-05-17 Nissan Motor Co Ltd Robot hand

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Publication number Priority date Publication date Assignee Title
JPH02143189A (en) * 1988-11-24 1990-06-01 Shimadzu Corp Electron detector
JP2003020135A (en) * 2001-07-11 2003-01-21 Fuji Photo Film Co Ltd Sheet body handling device
JP2004017257A (en) * 2002-06-20 2004-01-22 Matsushita Electric Ind Co Ltd Part gripping device
JP2006347694A (en) * 2005-06-15 2006-12-28 Nisca Corp Sheet bundle conveyance device and bookbinding device using the same
JP2007118148A (en) * 2005-10-31 2007-05-17 Nissan Motor Co Ltd Robot hand

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102699924A (en) * 2012-06-01 2012-10-03 上海大学 Tail clamping handle mechanism of manipulator

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CN101952089A (en) 2011-01-19

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