CN217020618U

CN217020618U - Backing plate and laminate processing device

Info

Publication number: CN217020618U
Application number: CN202220052526.4U
Authority: CN
Inventors: 藤井干士; 铃木到
Original assignee: Sumitomo Chemical Co Ltd
Current assignee: Sumitomo Chemical Co Ltd
Priority date: 2021-02-09
Filing date: 2022-01-10
Publication date: 2022-07-22
Anticipated expiration: 2032-01-10
Also published as: JP3231690U

Abstract

Provided are a spacer for fixing an optical film laminate, which can suppress processing defects of an optical film, and a laminate processing apparatus having the spacer. A second backing plate (31) for fixing an optical film laminate is provided with: a clamping member contact surface (31M) configured to contact with the second clamping member (30), and a lamination body contact surface (31K) which is arranged on the opposite side of the clamping member contact surface (31M) and contacts with the optical film lamination body. The laminate contact surface (31K) has a shape having a longitudinal direction. One end portion laminate contact surface (31K alpha) and the other end portion laminate contact surface (31K gamma), which are both end portions in the longitudinal direction of the laminate contact surface (31K), protrude from the central portion laminate contact surface (31K beta), respectively.

Description

Backing plate and laminate processing device

Technical Field

The present invention relates to a pad for fixing an optical film laminate and a laminate processing apparatus.

Background

Conventionally, a laminate in which a plurality of optical films such as polarizing films are stacked is sandwiched and fixed between a pair of clamping members from both sides in the thickness direction, and the end face of the fixed laminate is cut with an end mill or the like or a through hole such as an imaging hole is formed in the fixed laminate.

Prior art documents

Patent literature

Patent document 1: japanese patent No. 3871332

Patent document 2: japanese patent No. 6704081

SUMMERY OF THE UTILITY MODEL

Problems to be solved by the utility model

The inventors of the present invention have studied and found that, when a through hole such as an imaging hole is formed in an end portion in a longitudinal direction of a laminate having an optical film in the longitudinal direction (for example, a rectangular optical film), a processing defect occurs in the optical film.

The inventors of the present invention have made studies and found that a sufficient pressure cannot be applied to the end portion in the longitudinal direction of the optical film laminate by the clamp member, and when a through hole is formed in the end portion, a stress generated by a tool such as an end mill causes a processing defect such as lifting of a release film such as a seed film or a separator provided on the surface of the optical film and a reduction in dimensional accuracy.

The present invention has been made in view of the above problems, and an object thereof is to provide an optical film laminate fixing spacer capable of suppressing processing defects at both longitudinal direction end portions of an optical film, and a laminate processing apparatus including the optical film laminate fixing spacer.

Means for solving the problems

The backing plate of the present invention is a backing plate for fixing an optical film laminate, wherein,

the backing plate is provided with: a plane arranged to contact the chucking member, and a laminate contact surface provided on the opposite side of the plane and contacting the optical film laminate,

the laminated body contact surface has a shape having a longitudinal direction,

both ends of the laminate contact surface in the longitudinal direction protrude from a central portion of the laminate contact surface in the longitudinal direction.

The both end portions of the laminate contact surface may be inclined so that a protruding distance from the central portion increases as the distance from the central portion increases.

The angle θ of the slope of the inclination may be 0.10 ° to 0.48 °.

The laminate contact surface may have a ring shape having a longitudinal direction.

The outer shape of the contact surface of the laminate may be rectangular, elliptical or oblong.

The shim plate may further include at least one hole that is provided at any one of the two end portions of the lamination body contact surface and extends in a direction perpendicular to a plane that is disposed in contact with the clamping member.

The diameter of the hole may be 1.5mm to 4.0 mm.

The distance between the hole and the end surface of the pad plate in the longitudinal direction may be 2mm or less.

The laminate processing apparatus of the present invention is a laminate processing apparatus,

the laminate processing device is provided with:

a pair of clamping members for clamping the optical film laminate from both sides in the thickness direction;

a backing plate disposed between the optical film laminate and one of the clamping members; and

a processing unit that processes the optical film laminate,

the mat is any one of the mats described above.

Effect of the utility model

According to the present invention, processing defects at both longitudinal ends of the optical film can be suppressed.

Drawings

Fig. 1 is a schematic side view of an end face machining apparatus 100 according to an embodiment of the present invention.

Fig. 2 (a) is a perspective view of the upper surface of the first clamping member 20 and the first shim plate 21 in fig. 1, and fig. 2 (b) is a perspective view of the lower surface of the first clamping member 20 and the first shim plate 21 in fig. 1.

Fig. 3 is a perspective view of the upper surfaces of the second clamping member 30 and the second pad 31 in fig. 1.

Fig. 4 is a side view of the second clamping member 30 and the second pad 31 in fig. 1.

Fig. 5 is a view from V-V of fig. 1.

Fig. 6 is an enlarged view of the laminate 10 in fig. 1.

Fig. 7 is a top surface perspective view of other embodiments of the second clamping member 30.

Description of the reference numerals:

10 … laminate, 12 … film, 20 … first clamping member, 21 … first pad, 30 … second clamping member, 31 … second pad, 31M … clamping member contact surface, 31K … laminate contact surface, 31 α … one end, 31 β … central portion, 31 γ … other end, 31K α … one end laminate contact surface, 31K β … central portion laminate contact surface, 31K γ … other end laminate contact surface, 40 … processing portion, 60 … pressing portion, 61 … fixing portion, 100 … end face processing device.

Detailed Description

An embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a side view of an end surface processing apparatus (laminate processing apparatus) 100 according to an embodiment of the present invention.

The end surface processing apparatus 100 of the present embodiment mainly includes a first shim plate 21, a first clamping member 20, a second shim plate 31, a second clamping member 30, a fixing portion 61, a pressing portion 60, and a processing portion 40.

As shown in fig. 1, the first shim 21 and the second shim 31 are disposed so as to sandwich the film laminate (optical film laminate) 10 from both sides in the thickness direction. In the figure, the X, Y direction is the horizontal direction, and the Z direction is the vertical direction.

The first pad 21 is disposed above the second pad 31. A first clamping member 20 is disposed above the first shim plate 21 and a second clamping member 30 is disposed below the second shim plate 31.

(first pad 21)

As shown in fig. 2 (a) and (b), the first pad 21 is a rectangular plate-like member, and the thickness direction is arranged in the Z direction (pressing direction), and the length direction is arranged parallel to the X direction when viewed from the Z direction.

As shown in fig. 2, the first shim plate 21 has a laminate contact surface 21K, which is a plane in contact with the laminate 10 of films, on a lower surface side opposite to the second shim plate 31, and a clamping member contact surface 21M, which is a plane in contact with the first clamping member 20, on an upper surface side opposite to the laminate contact surface 21K.

The size of the rectangle of the first backing plate 21 can be set as appropriate within a range smaller than the outer shape of the surface (the surface perpendicular to the thickness direction) of the fixed film laminate 10.

The rectangular aspect ratio of the first backup plate 21 is preferably set to be approximately the same as the aspect ratio of the surface (the surface perpendicular to the thickness direction) of the laminate 10 (film 12) to be pressed (for example, 90% to 110%). Typically, depending on the shape of the processed product, it may be set to 1.01 to 3.00, preferably 1.40 to 2.50, and more preferably 1.70 to 2.20, for example. The length of the first shim plate 21 in the longitudinal direction also depends on the size of the work product, but may be set to 10mm to 300 mm.

In the present embodiment, as shown in fig. 2 (b), the first pad 21 has a rectangular recess P in the center of the lower surface, and the laminate contact surface 21K has a rectangular ring shape. In the present specification, a rectangular ring shape means a ring shape constituted by a rectangular outline. In the present embodiment, the center portion of the laminate contact surface 21K is not in contact with the laminate 10 due to the concave portion P, but the center portion of the laminate contact surface 21K may be not in contact with a through hole. The shape of the laminate contact surface 21K may be a simple plane without a recess.

The width S of the ring of the laminate contact surface 21K of the first backing plate 21 may be set to 5mm to 25mm, preferably 10mm or more, and further preferably 15mm or less.

The thickness G of the first shim plate 21 shown in fig. 2 (b) may be appropriately set within a range in which the first shim plate 21 is not deflected. The thickness is preferably 2mm to 15mm, more preferably 3mm or more, further preferably 13mm or less, and may be 7mm or less.

The first shim plate 21 is preferably a metal member. Examples of metals are aluminum, steel, stainless steel, alloy tool steel (e.g., SKD11), and the like.

The first shim plate 21 has a hole 21H at an end portion on the longitudinal direction (-X) side, and the hole 21H is opened in the laminate contact surface 21K and penetrates through the laminate contact surface 21K so as to extend in the direction perpendicular thereto.

The diameter of the hole 21H may be set to 1.5mm to 4.0 mm. In fig. 2, the distance W between the hole 21H of the first shim plate 21 and the longitudinal end face of the first shim plate 21 may be 2mm or less, preferably 0.1mm or more.

(first clamping member 20)

The first clamping member 20 is a rod-shaped member fixed to a pressing portion 60 described later, and is movable downward by the pressing portion 60. The lower end surface 20U of the first clamping member 20 is planar and contacts a portion of a plane including the center (center of gravity) of the clamping member contact surface 21M of the first shim plate 21. The first shim plate 21 and the first clamping member 20 are fixed to each other by a known method such as welding or screwing.

The lower limit of the distance a (a in fig. 2 a) from the end in the longitudinal direction of the first shim plate 21 to the contact region S between the clamping member contact surface 21M of the first shim plate 21 and the first clamping member 20 may be 10% or more, or 30% or more, with respect to the width B (B in fig. 2 a) in the longitudinal direction (X direction) of the contact region S. In general, when the distance a is 30% or more with respect to the width B, the pressure applied to the end portion of the first backing plate 21 in the longitudinal direction tends to be low, and thus the pressure applied to the laminated body 10 tends to be uneven. According to the present embodiment, even when the distance a is 30% or more with respect to the width B, the pressure can be uniformly applied to the stacked body 10. The upper limit of the distance a may be 100% or less with respect to the width B.

(second pad 31)

As shown in fig. 1, the second shim plate 31 is disposed below the first shim plate 21.

As shown in fig. 1 and 3, the second clamp member 30 is disposed below the second pad 31.

The second pad 31 is a rectangular plate-like member. The second shim plate 31 has a laminate contact surface 31K that contacts the laminate 10 of films on the upper surface side opposite to the laminate contact surface 21K of the first shim plate 21, and a clamp contact surface 31M that is a flat surface that contacts the second clamp 30 on the surface opposite to the laminate contact surface 31K.

In the second pad 31, the thickness direction is arranged in the Z direction (pressing direction), and the longitudinal direction as viewed from the Z direction is arranged parallel to the X direction, and the longitudinal direction of the rectangle of the second pad 31 is arranged parallel to the longitudinal direction of the rectangle of the first pad 21. The size and aspect ratio of the rectangle of the second shim plate 31 can be set within the same range as those of the first shim plate 21, and are preferably the same as those of the first shim plate 21.

As shown in fig. 3, the second shim plate 31 also has a rectangular recess P in the center of the upper surface, and the laminate contact surface 31K is rectangular ring-shaped, similarly to the first shim plate 21. In the present embodiment, the central portion of the laminate contact surface 31K is not in contact with the laminate 10 by the concave portion P, but the central portion of the laminate contact surface 31K may be not in contact by the through hole.

The width S of the ring of the laminate contact surface 31K of the second backing plate 31 may be set to 5mm to 25mm, preferably 10mm or more, and further preferably 15mm or less.

As shown in fig. 3 to 5, the second pad 31 has one end portion 31 α, a central portion 31 β, and the other end portion 31 γ in this order from one end to the other end in the longitudinal direction (X direction). Accordingly, the laminate contact surface 31K has one end laminate contact surface 31K α, a central laminate contact surface 31K β, and the other end laminate contact surface 31K γ in this order.

The center portion laminate contact surface 31K β is a plane parallel to the clamp contact surface 31M, is arranged parallel to the laminate contact surface 21K of the first shim plate 21, and is a surface perpendicular to the press direction (Z axis).

On the other hand, the one-end-portion laminate contact surface 31K α and the other-end-portion laminate contact surface 31K γ protrude outward in the thickness direction (in a direction perpendicular to the center-portion laminate contact surface 31K β and away from the clamp contact surface 31M) from the center-portion laminate contact surface 31K β, respectively. Specifically, the one-end-portion laminate contact surface 31K α and the other-end-portion laminate contact surface 31K γ are inclined such that the protruding distance from the central-portion laminate contact surface 31K β increases as the distance from the central-portion laminate contact surface 31K β increases.

In the present embodiment, as shown in fig. 3 and 4, the one-end-portion-laminate contact surface 31K α and the other-end-portion-laminate contact surface 31K γ are inclined planes, and the inclination angle θ, that is, the angle (acute angle) formed by the one-end-portion-laminate contact surface 31K α and the other-end-portion-laminate contact surface 31K γ and a plane parallel to the central-portion-laminate contact surface 31K β is preferably 0.10 ° to 0.48 °. The projecting distances D of the one end laminate contact surface 31K α and the other end laminate contact surface 31K γ from the central laminate contact surface 31K β, out of both end surfaces of the second shim plate 31, are preferably 0.05mm to 0.25mm, respectively.

The θ may be different from each other in the one end portion 31 α and the other end portion 31 γ, but is preferably the same.

The length in the longitudinal direction (X direction) of the one end portion 31 α and the other end portion 31 γ is not particularly limited, and the boundary between the central portion 31 β and the one end portion 31 α and the other end portion 31 γ may be at the starting point Q of the one end portion 31 α and the other end portion 31 γ when viewed from the Y direction as shown in fig. 4₁And Q₂The position is set to be the same as the end Px or to be outside the end Px in the longitudinal direction. The end Px is a longitudinal end of the contact region P between the back surface (clamping member contact surface 31M) of the second shim plate 31 and the second clamping member 30. The lengths in the longitudinal direction of the one end portion 31 α and the other end portion 31 γ may be different from each other, but are preferably the same. In particular, from the viewpoint of securing the ends in the longitudinal direction, the lengths in the longitudinal direction (X direction) of the one end portion 31 α and the other end portion 31 γ are preferably 5mm to 100mm, respectively.

The thickness G of the central portion 31 β of the second shim plate 31 shown in fig. 4 can be set as appropriate in the same manner as the first shim plate 21.

The second shim plate 31 can be made of the same material, construction and thickness as the first shim plate 21.

The second shim plate 31 has a hole 31H at the other end 31 γ, and the hole 31H opens in the other end laminate contact surface 31K γ and penetrates in a direction perpendicular to the clamp member contact surface 31M (the central laminate contact surface 31K β). The diameter of the hole 31H may be set to 1.5mm to 4.0mm, and is preferably the same as the hole 21H of the first shim plate 21. The hole 31H and the hole 21H are disposed at positions coaxial with each other. Therefore, as shown in fig. 4 and 5, in the second shim plate 31, the distance W between the hole 31H and the longitudinal end face of the second shim plate 31 may be 2mm or less, preferably 0.1mm or more.

Fig. 5 is a view along line V-V of fig. 1. The size of the second shim 31 is preferably set such that, when the laminate contact surface 31K of the second shim 31 is brought into contact with the surface of the laminate 10 of the pre-processed film in the thickness direction, the end face (outer end) EF of the laminate 10 of the film protrudes outward 0.8mm to 1.5mm beyond the outer end AP of the laminate contact surface 31K of the laminate 10 in the second shim 31, as viewed in the thickness direction of the laminate 10 of the film. Here, the amount of protrusion of the stacked body from the outer end AP of the stacked body contact surface 31K when viewed in the thickness direction is referred to as T. For example, the protrusion amount T before processing may be 1mm or more. The protrusion amount T of the processed laminate may be 0.3mm to 0.8mm, or may be 0.30mm to 0.50 mm.

The first pad 21 is also preferably the same size as the second pad 31.

(second clamping member 30)

Returning to fig. 1, the second clamping member 30 is a rod-shaped member fixed to a fixing portion 61 described later, and the flat upper surface 30U of the second clamping member 30 is in contact with a flat surface portion including the center (center of gravity) of the clamping member contact surface 31M of the second pad 31. The second shim plate 31 and the second clamp member 30 are fixed to each other by a known method such as welding or screwing, and the second clamp member 30 is connected to the fixing portion 61. The central axis of the second clamping member 30 is arranged on the same line as the central axis of the first clamping member 20.

The distance C from the end of the second shim plate 31 in the longitudinal direction to the contact region P between the clamp member contact surface 31M of the second shim plate 31 and the second clamp member 30 and the width F of the contact region P in the longitudinal direction (X direction) shown in fig. 5 can be set as appropriate in the same manner as the distance a and the distance B of the first shim plate 21.

In fig. 1, the second pad plate 31 is fixed to the fixing portion 61 via the second clamp member 30 such that the laminate contact surface 31K faces upward, the first pad plate 21 is fixed to the pressing portion 60 via the first clamp member 20 such that the laminate contact surface 21K faces downward, and the laminate contact surface 31K faces the laminate contact surface 21K.

Pressing portion 60 is disposed above fixing portion 61, and pressing portion 60 is configured to be movable in the vertical direction with respect to fixing portion 61. Therefore, the pressing portion 60 can press the laminate contact surface 21K of the first shim plate 21 toward the laminate contact surface 31K of the second shim plate 31. That is, the laminate 10 of the films can be fixed between the laminate contact surface 21K of the first shim 21 and the laminate contact surface 31K of the second shim 31 by pressing them from both sides in the thickness direction.

The specific structure of the pressing portion 60 is not particularly limited, and a known moving mechanism such as a screw jack or a hydraulic jack can be used. The device can be of a single-shaft type or a multi-shaft type.

The machining unit 40 includes an end mill 44, a rotation driving unit 42 of the end mill, and a moving unit 46 of the end mill.

The form of the counter cutter 44 is not particularly limited, and for example, a Router (Router) type end cutter or the like can be preferably used. The edge length (Z-axis direction) of the end mill 44 is preferably longer than the thickness of the film laminate 10.

The rotary drive unit 42 rotates the end mill 44 about its axis. In the present embodiment, the rotation driving unit 42 rotates the end mill 44 about an axis parallel to the thickness direction (Z direction) of the stacked body 10.

The moving unit 46 of the end mill is capable of moving the rotating end mill 44 in a direction perpendicular to the thickness direction of the stacked body 10 along the end face (side face) EF in a state where the side face of the end mill 44 is in contact with the end face EF of the stacked body 10. The moving portion 46 can move the rotating end mill 44 in the rotational axial direction of the end mill, and form a through hole at a desired position of the stacked body 10.

The end surface processing apparatus 100 may have only one processing unit 40, but may have two or more processing units 40 from the viewpoint of performing processing quickly.

(method of facing and method of producing film for facing)

Next, a method of processing an end face and a method of manufacturing an end-face processed film according to an embodiment of the present invention will be described.

First, a laminate 10 of films 12 as shown in fig. 6 is prepared. Each film 12 may be a single-layer film or a laminated film.

An example of a single layer film is a resin film. Examples of the resin include a cellulose-based resin (such as triacetylcellulose), a polyolefin-based resin (such as polypropylene-based resin), a cycloolefin-based resin (such as norbornene-based resin), an acrylic-based resin (such as polymethyl methacrylate-based resin), a polyester-based resin (such as polyethylene terephthalate-based resin), and a polyimide-based resin (such as polyimide or polyamideimide). These single-layer films may be optical films such as protective films, substrate films, retardation films, and window films.

Examples of the laminated film are a polarizing plate, a circularly polarizing plate, and a touch sensor.

For example, the single-layer film is laminated on at least one surface of the polarizer with an adhesive or an adhesive.

The circularly polarizing plate has, for example, the above-described polarizing plate and a retardation (1/4-long) film.

The laminated film may further include a releasable film such as a protective film for protecting the surface of the laminated film, a release film for protecting the laminated film until the laminated film is bonded to an adhesive layer of a display device, or the like. Since these films need to be peeled off until they reach a final product such as a display device, the peeling force is designed to be low. When a laminate film including such a peelable film is processed with an end mill blade or the like, the peelable film may be partly peeled off (lifted up). However, according to this embodiment, even in the case where a part of the laminated film includes the release film, the lift-up of the release film can be suppressed.

The thickness of each film 12 is not particularly limited, but may be, for example, 20 μm to 500mm, preferably 50 μm to 500 μm, and more preferably 50 μm to 200 μm.

The outer shape (shape viewed from the thickness direction) of the film 12 may be a shape corresponding to the outer shapes of the first backing plate 21 and the second backing plate 31. In the present embodiment, a rectangular film is prepared in accordance with the outer shapes of the first backing plate 21 and the second backing plate 31 described above.

The aspect ratio of the film is preferably 1.01 to 3.00, excluding 0. The length of the long side of the film may be, for example, 100mm or more.

The laminate 10 includes a plurality of such films 12. The outer shape of each membrane 12 is preferably substantially the same. For example, the multilayer film 12 having substantially the same outer shape can be obtained by cutting the film 12 from a film blank with a thomson knife or the like. In the laminated body 10, the respective films 12 are laminated in such a manner that long sides are parallel to each other and end portions overlap each other when viewed from the thickness direction.

Each of the films 12 of the laminate 10 is usually a film 12 having the same lamination structure as each other, but films 12 having different lamination structures may be laminated. The number of the films 12 in the laminate 10 is not particularly limited as long as it is 2 or more, and is usually 5 or more, 10 or more, or 50 or more.

In order to prevent the film 12 from being damaged when the laminate 10 is sandwiched and fixed between the first shim 21 and the second shim 31, the laminate 10 may have the protective film 14 on one or both ends in the lamination direction, in addition to the multilayer film 12.

An example of the protective film 14 is a resin film. Examples of the resin include polystyrene, polyethylene terephthalate, and the like, in addition to the resins exemplified in the resin film.

The thickness of the protective film 14 may be, for example, 0.2mm to 1.0mm, preferably 0.3mm to 0.8mm, and more preferably 0.3mm to 0.6 mm.

The thickness of the laminate 10 may be, for example, 10mm to 60mm, preferably 20mm to 50 mm.

The end of the laminate 10 is the object of processing in the present embodiment.

First, the laminate 10 is sandwiched and fixed between the first shim plate 21 and the second shim plate 31 so that the laminate contact surface 21K of the first shim plate 21 is in contact with one side surface (upper surface) in the thickness direction of the laminate 10, and the laminate contact surface 31K of the second shim plate 31 is in contact with the other side surface (lower surface) in the thickness direction of the laminate 10. Specifically, after the laminate 10 is placed on the laminate contact surface 31K of the second shim plate 31 coupled to the fixing portion 61, the first shim plate 21 is moved downward by the driving of the pressing portion 60, so that the laminate 10 is pressed in the thickness direction between the laminate contact surfaces 21K and 31K, and the laminate 10 is fixed.

Next, with the laminate 10 fixed, the end portions of the laminate 10 in the longitudinal direction are processed by the processing portions. Specifically, for example, a through hole having a desired inner diameter can be formed in the stacked body 10 by inserting a drill or an end mill from the hole 21H of the first shim plate 21 toward the hole 31H of the second shim plate 31 to form a hole, and then cutting the inner surface of the hole as necessary to enlarge the diameter of the hole.

In addition, the respective end faces EF on the short side and the long side of the film of the laminate may be processed. Specifically, the end mill 44 that rotates about an axis parallel to the thickness direction of the stacked body 10 can be moved along the end face in the direction orthogonal to the thickness direction, that is, in the longitudinal or short direction, while bringing the side face of the end mill 44 into contact with the end face EF of the stacked body, thereby processing each end face EF. Specific examples of the machining include cutting. This enables the planar shape (dimension, perpendicularity, etc.) of each film 12 constituting the laminate 10 to be formed into a predetermined shape with high accuracy.

Thereafter, the pressing by the pressing portion 60 is released, and the laminated body 10 is taken out from between the first shim plate 21 and the second shim plate 31, whereby the laminated body 10 with the end portions processed with high accuracy can be obtained. If necessary, the separated membranes 12 can be obtained by separating each membrane 12 from the laminate 10.

According to the present embodiment, the one-end-portion-laminate contact surface 31K α of the one end portion 31 α and the other-end-portion-laminate contact surface 31K γ of the other end portion 31 γ of the second shim plate 31 protrude in the thickness direction (Z direction) of the laminate from the central-portion-laminate contact surface 31K β of the central portion 31 β. Therefore, concentration of pressure at the central portion 31 β is avoided, and the pressures applied to the central portion 31 β, the one end portion 31 α, and the other end portion γ become uniform. As a result, processing defects such as warping of the release film and reduction in processing accuracy during processing of the end portion in the longitudinal direction can be suppressed.

In contrast, for example, when the entire laminate contact surface 31K of the second backing plate 31 is a flat surface, the pressure at both ends in the longitudinal direction tends to be low. In this case, both ends of the film in the longitudinal direction of the film are likely to be displaced, and the processing accuracy is likely to be lowered.

(modification mode)

The present invention is not limited to the above embodiment, and various modifications are possible.

For example, in the above embodiment, the one end portion laminate contact surface 31K α and the other end portion laminate contact surface 31K γ are inclined surfaces that are flat surfaces, but as long as the protruding distance from the center portion laminate contact surface 31K β increases as the distance from the center portion laminate contact surface 31K β increases, the inclined surfaces may be curved surfaces with rounded corners instead of flat surfaces.

Further, the one end portion laminate contact surface 31K α and the other end portion laminate contact surface 31K γ do not incline, and as shown by a broken line Q in fig. 4, may be parallel to the center portion laminate contact surface 31K β and may protrude with a step from the center portion laminate contact surface 31K β. The protrusion distance D may be 0.05mm to 0.25 mm.

In the above embodiment, one hole is provided in each of the first shim plate 21 and the second shim plate 31, but when no hole is formed in the laminate, the hole does not need to be provided. When a plurality of holes are opened in the laminate, the number of holes may be plural, and the position is not limited.

The shape of the film and the laminate 10 is not limited to a rectangle, and may be any shape having a longitudinal direction, that is, an aspect ratio exceeding 1. For example, the rectangle may be a rounded rectangle, or may be an ellipse or an oval. In this case, the aspect ratio of the film or the laminate is preferably 1.01 to 3.00, in addition to 0. The length of the film in the longitudinal direction may be, for example, 100mm or more. When the length of the long side of the minimum circumscribed rectangle is LL and the length of the short side is SS, the aspect ratio of the film length of the shape other than the rectangle is defined by LL/SS.

The outer shapes of the first shim plate 21 and the second shim plate 31 can be set appropriately so as to match the outer shape of the laminated body 10. For example, if the outer shape of the laminate 10 is an ellipse, the outer shapes of the first shim 21 and the second shim 31 are preferably also ellipses, and if the outer shape of the laminate 10 is a rounded rectangle, the outer shapes of the first shim 21 and the second shim 31 may also be rounded rectangles. In this case, the lamination contact surface may be in the shape of an elliptical ring or a rounded rectangular ring. In this case, the amount T of projection of the laminated body 10 from the outer ends of the first shim 21 and the second shim 31 is preferably within the above range.

Fig. 7 shows an example of the second shim plate 31 in the case where the shape of the laminated body 10 is an ellipse (oval) when viewed from the thickness direction. The second shim plate 31 is an elliptical (oval) plate corresponding to the shape of the laminated body, and the laminated body contact surface 31K is an elliptical (oval) ring. The one-end-portion laminate contact surface 31K α of the one end portion 31 α and the other-end-portion laminate contact surface 31K γ of the other end portion 31 γ of the second shim plate 31 are inclined surfaces protruding from the central-portion laminate contact surface 31K β of the central portion 31 β, as in the above-described embodiment.

In the above embodiment, the laminate contact surface 21K of the first shim plate 21 has an annular shape, but is not limited thereto. For example, even if a non-contact portion that does not contact the laminate 10 is not provided at the center of the laminate contact surface 21K, the laminate contact surface 21K may have a rectangular shape, an oval shape, or the like.

The shape of the laminate contact surface 31K of the second backing plate 31 may be implemented without being an annular shape. For example, the laminate contact surface 31K may have a shape without a non-contact portion such as a recess or a penetration portion in the center, for example, a rectangular shape or an elliptical shape. However, the outer shape of the laminate contact surface 31K is preferably the same as the laminate contact surface 21K.

Needless to say, the configuration of the processing portion 40 and the pressing portion 60 is not limited to the above configuration. For example, although the end mill is used in the above embodiment, a tool other than the end mill, for example, a planer tool may be used. In the above embodiment, the fixing portion 61 is located below and the pressing portion 60 is located above, but the arrangement may be reversed, or there may be no fixing portion and the pair of pressing portions 60 may be arranged above and below, respectively.

[ examples ]

(example 1)

An end face of a laminate having 101 sheets of polarizing plates was processed with an end mill under the following conditions using the end face processing apparatus shown in fig. 1 to 5.

A polarizing plate: a polarizing plate comprising a protective film (substrate: polyethylene terephthalate [ PET ]), an adhesive layer, triacetylcellulose [ TAC ], a polarizing film (film in which oriented iodine is adsorbed onto a polyvinyl alcohol film), TAC, a retardation film, an adhesive layer, and a separator (substrate: release-treated PET) laminated in this order. The thickness was 260. mu.m, the length was 155.6mm, and the length was 75.6 mm.

An end face machining device: a biaxial polarizer processing machine (PLPB-3523CWA) manufactured by Megaro Technica corporation was provided with the following additional specifications and molded.

First and second clamping members 20 and 30: widths B and F in the X-axis direction were 90 mm.

Shape of first pad 21 and second pad 31: the laminate contact surface was a rectangular ring, the width S of the ring was 10mm, the thickness of the central portion was 5mm, the long side 154 was mm, and the short side was 74 mm.

One end 31 α of the second shim plate 31: the inclined plane is a plane as shown in fig. 3 to 5, and has a length in the longitudinal direction (X axis) of one end portion 31 α and the other end portion 31 γ of 30mm, a projection distance D of end faces of the one end portion 31 α and the other end portion 31 γ of 0.05mm, and θ of the one end portion 31 α and the other end portion 31 γ of 0.10 °.

Holes of the first shim plate 21 and the second shim plate 31: a diameter of 2.8mm, a distance W from the end face of the pad plate in the longitudinal direction to the hole of 0.2 mm: the first shim plate and the second shim plate have five holes at equal intervals in the short direction.

The widths C and a of the first pad 21 and the second pad 31 are 32mm, and a/B is 35.6% and C/F is 35.6%.

Material of the first pad 21 and the second pad 31: aluminum.

Processing conditions are as follows: after each end face of the laminate on the short and long sides of the film was processed by holding and fixing the laminate having 40 sheets of polarizing plates stacked thereon with a spacer, a circular through-hole having a diameter of 2.0mm was opened at 5 positions on the laminate at a distance of 1.0mm from the end face in the longitudinal direction of the laminate to the hole by the hole of each spacer.

When a pressure measurement film (trade name: Prescale, ultra low pressure (LLLW); manufactured by FUJIFILM) was provided between the laminate and the first backing plate 21 to measure the pressure distribution at the time of fixing, it was confirmed that the pressure was applied almost uniformly to the entire contact surface. The results are shown in Table 1.

When the end faces of the holes were observed after the processing of 5 holes, no lifting of the PET film was observed in any of the holes. The results are shown in Table 1. When the end faces of the laminate were confirmed, no lifting of the PET film was confirmed.

In addition, the shape of each hole was not deformed from a circular shape on the front surface or the back surface of the laminate.

(example 2)

The same as in example 1, except that the slope of the second shim plate 31 is as follows.

One end 31 α and the other end 31 γ of the second shim plate 31: the length of the one end portion 31 α and the other end portion 31 γ in the longitudinal direction (X axis) is 30mm, the protruding distance D between the one end portion 31 α and the other end portion γ is 0.1mm, and θ between the one end portion 31 α and the other end portion γ is 0.19 °, which is a planar inclined surface as shown in fig. 4.

When the pressure distribution at the time of fixation was measured in the same manner as in example 1, it was confirmed that the pressure was applied almost uniformly to the entire contact surface.

When the end faces of the holes were observed after the processing of 5 holes, no lifting of the PET film was observed in any of the holes. When the end faces of the laminate were confirmed, no lifting of the PET film was confirmed.

In addition, the shape of each hole was not distorted from a circle on the front surface or the back surface of the laminate.

(example 3)

One end 31 α and the other end 31 γ of the second shim plate 31: the inclined plane is a plane as shown in fig. 4, and has a length in the longitudinal direction (X axis) of 30mm in one end portion 31 α and the other end portion 31 γ, a projection distance D of 0.2mm in one end portion 31 α and the other end portion γ, and θ of 0.38 ° in one end portion 31 α and the other end portion γ.

When the end faces of the holes were observed after the processing of 5 holes, no warpage of the PET film was observed in any of the holes. When the end faces of the laminate were confirmed, no lifting of the PET film was confirmed.

(example 4)

The same as in example 1 was performed, except that the slope of the second shim plate 31 was as follows.

One end 31 α and the other end 31 γ of the second shim plate 31: the inclined plane is a plane as shown in fig. 4, and has a length in the longitudinal direction (X axis) of the one end portion 31 α and the other end portion 31 γ of 30mm, a projecting distance D of the one end portion 31 α and the other end portion γ of 0.25mm, and θ of the one end portion 31 α and the other end portion γ of 0.48 °.

Comparative example 1

The second shim plate 31 is the same as in example 1, except that a laminate contact surface 31K which is flat as a whole is used, as in the first shim plate 21.

When the pressure distribution at the time of fixation was measured in the same manner as in example 1, a high pressure was applied to the center portion of the long side, and the pressures were unevenly applied to the entire contact surface, particularly, to both short sides and the vicinity of the hole portion in the contact surface. When each end face of the laminate was confirmed, the peeling of the PET film was confirmed on both end faces on the film short side of the laminate.

When the end faces of the holes were observed after processing 5 holes, the PET film was confirmed to be lifted in all the holes.

Further, the shape of each hole was distorted from a circular shape when observed on the front surface or the back surface of the laminate.

(example 5)

One end 31 α and the other end 31 γ of the second shim plate 31: the inclined plane is a plane as shown in fig. 4, and has a length in the longitudinal direction (X axis) of the one end portion 31 α and the other end portion 31 γ of 30mm, a projecting distance D of the one end portion 31 α and the other end portion γ of 0.3mm, and θ of the one end portion 31 α and the other end portion 31 γ of 0.57 °.

When the pressure distribution at the time of fixation was measured in the same manner as in example 1, high pressure was applied to both short sides and the vicinity of the hole portion, and pressure unevenly applied to the entire contact surface, particularly, the lengthwise center portion of both long sides of the contact surface was low. In addition, when each end face of the laminate was confirmed, the peeling of the PET film was confirmed in the center portion in the longitudinal direction of both end faces on the film long side of the laminate.

When the end faces of the holes were observed after processing 5 holes, the PET film was confirmed to be lifted in one hole.

(example 6)

One end 31 α and the other end 31 γ of the second shim plate 31: the length of the one end portion 31 α and the other end portion 31 γ in the longitudinal direction (X axis) is 30mm, the protruding distance D between the one end portion 31 α and the other end portion γ is 0.5mm, and θ between the one end portion 31 α and the other end portion 31 γ is 0.95 ° in the inclined plane as shown in fig. 4.

As described above, in the embodiment, even if the distance between the end surface in the longitudinal direction and the hole is narrow, the outer periphery of the hole can be sufficiently held, and accurate machining at both ends in the longitudinal direction can be realized.

[ Table 1]

Claims

1. A backing plate for fixing an optical film laminate,

it is characterized in that the preparation method is characterized in that,

the laminate contact surface has a shape having a longitudinal direction,

both end portions of the laminate contact surface in the longitudinal direction protrude from a central portion of the laminate contact surface in the longitudinal direction.

2. The cushion pan of claim 1,

the two end portions of the laminate contact surface are each inclined such that a protruding distance from the central portion increases as the distance from the central portion increases.

3. The underlay sheet of claim 2,

the angle theta of the inclined gradient is 0.10-0.48 deg.

4. The underlay sheet of claim 1 or 2,

the laminate contact surface has an annular shape having a longitudinal direction.

5. The underlay sheet of claim 1 or 2,

the shape of the contact surface of the laminated body is rectangular, oval or oblong.

6. Pad according to claim 1 or 2,

the shim plate further includes at least one hole that is provided at any one of the two end portions of the lamination body contact surface and extends in a direction perpendicular to the plane.

7. The cushion pan of claim 6,

the diameter of the hole is 1.5 mm-4.0 mm.

8. The cushion pan of claim 6,

the distance between the hole and the end face of the pad plate in the length direction is less than 2 mm.

9. A laminated body processing device is characterized in that,

the laminate processing device is provided with:

a pair of clamping members for clamping the optical film laminated body from two sides in the thickness direction;

a processing unit that processes the optical film laminate,

the mat is as claimed in any one of claims 1 to 8.