TW202037432A - Method for manufacturing optical film - Google Patents

Abstract

Provided is a method for manufacturing an optical film, which includes drilling using an end mill, prevents quality deterioration of an inner circumferential surface of a hole, and is capable of drilling with high dimensional accuracy. This method for manufacturing a drilled optical film includes forming a workpiece by laminating a plurality of optical films, and a drilling step of drilling the workpiece using an end mill. The drilling step includes drilling a pilot hole in the workpiece with the end mill in a one-end supported state in which one axial end of the end mill is supported, followed by cutting an inner circumferential surface of the pilot hole with the end mill in a both-end supported state in which one and the other axial ends of the end mill are supported.

Description

Manufacturing method of optical film

The present invention relates to a manufacturing method of optical film.

In order to realize image display and/or improve the image display performance of image display devices such as portable terminals and notebook personal computers, various optical films (such as polarizing plates) are used. In recent years, the application of image display has become wider. In addition to the general rectangular optical film, there is also a demand for optical films of different shapes from the rectangular shape. One of the optical films with different shapes can be optical films with holes. When manufacturing the optical film, an end mill can be used to make a reserved hole, and the end mill can be used to cut the inner peripheral surface of the reserved hole to make a hole of a predetermined size.

In the above-mentioned hole drilling process, it is required that the processed body (optical film) does not produce cracks and other quality degradation, and can form holes with good dimensional accuracy. In addition, from the viewpoint of manufacturing efficiency, etc., it is advisable to provide a workpiece obtained by laminating as many layers of optical films as possible for drilling, and it is sought to form a hole with high dimensional accuracy even when the workpiece is made thicker. .

Prior art literature Patent literature Patent Document 1: International Publication No. 2017/047510

Problems to be solved by the invention The present invention was made to solve the above-mentioned conventional problems, and its main purpose is to provide a method for manufacturing an optical film, which includes the use of an end mill for drilling, and the manufacturing method can suppress the deterioration of the inner peripheral surface of the hole, and It can be drilled with excellent dimensional accuracy.

Means to solve the problem The method for manufacturing a hole-opening optical film of the present invention includes the following steps: stacking a plurality of optical films to form a workpiece; and, using an end mill to perform a hole-opening step on the workpiece; the hole-opening step Including: Use the end mill in the cantilever state held at one end of the axis to make a reserved hole on the workpiece, and use the end mill at one end of the shaft direction and the other end of the axis to cut the reservation The inner circumference of the hole. In one embodiment, when cutting the inner peripheral surface of the reserved hole, the other end of the end mill abuts against the support unit and is held. In one embodiment, the support unit is configured to be attachable and detachable to the end mill. In one embodiment, the support unit can move along the axial direction of the end mill. In one embodiment, the pressing pressure of the support unit to the end mill is 0.01 MPa or more. In one embodiment, the other end of the end mill is pointed cone shape. In one embodiment, the support unit has a recess configured to receive the other end of the end mill. In one embodiment, the bottom angle of the recess is ±10° of the top angle of the other end of the end mill. In one embodiment, the Vickers hardness of the end mill is HV900~HV7000. In one embodiment, the Vickers hardness of the part abutted by the end mill in the support unit is HV45 to HV800. In one embodiment, the outer diameter of the thickest part of the end mill is 6 mm or less. According to another aspect of the present invention, an opening device is provided. The hole-opening device includes a pair of jaws configured to hold a workpiece, an end mill with one end held, and a support unit. The support unit is arranged opposite to the end mill and is configured to hold the end mill The other end; the clamp has a through hole that allows the end mill to penetrate in the axial direction, the through hole is composed of a small diameter portion and a large diameter portion located outside the small diameter portion, and the large diameter portion has a through hole that changes outward The big shape.

Invention effect According to the present invention, it is possible to provide a method for manufacturing an optical film, which can suppress the deterioration of the inner peripheral surface of the hole, and can perform hole processing with excellent dimensional accuracy.

The following describes specific embodiments of the present invention with reference to the drawings, but the present invention is not limited by these embodiments. In addition, the drawings are schematically shown for ease of viewing, and the ratios of length, width, thickness, etc., and angles in the drawings are different from actual ones.

A. Manufacturing method of optical film The manufacturing method of the hole-cutting optical film of the present invention includes the following steps: stacking a plurality of optical films to form a workpiece; and, using an end mill to perform hole-opening processing on the workpiece. In the hole-opening step, the end mill in the cantilever state held at one end in the shaft direction is used to make a reserved hole on the workpiece, and then the one end in the shaft direction and the other end in the shaft direction are cut with the end mill in the held two-end fixed state. The inner peripheral surface of the reserved hole.

A-1. Form a workpiece FIG. 1 is a schematic perspective view for explaining the drilling process, and the workpiece W is shown in this drawing. As shown in Fig. 1, a work W formed by stacking a plurality of optical films is formed. When the optical film is formed into a workpiece, it means that the upper system is cut into any appropriate shape. Specifically, the optical film can be cut into a rectangular shape, can be cut into a shape similar to a rectangular shape, or can be cut into an appropriate shape (such as a circle) for the purpose. In the illustrated example, the optical film is cut into a rectangular shape.

Fig. 2 is a schematic cross-sectional view for explaining the installed state of the workpiece for drilling. The workpiece W should be clamped by the clamp 10 from above and below. The total thickness of the workpiece is, for example, 8mm~100mm, preferably 8mm~50mm, and preferably 8mm~40mm, more preferably 9mm~30mm, and particularly preferably 9mm~20mm. The optical film is laminated to the total thickness of the workpiece. The number of optical films constituting the workpiece can be, for example, 10 to 500 (in one embodiment, 10 to 300; in another embodiment, 10 to 50).

The clamp can be made of soft material, hard material, soft material and hard material. When it is made of soft materials, its hardness (JIS A) should be 20°~80°, more preferably 60°~80°. If the hardness is too high, the indentation caused by the clamp may remain. If the hardness is too low or too thick, the position will be shifted due to the deformation of the clamp, and the hole precision may be insufficient. The thickness of the clamp is, for example, 5 mm to 30 mm. When the clamp contains a soft material, the thickness of the layer made of the soft material is, for example, 0.3 mm to 5 mm.

In one embodiment, the jaw 10 has a through hole 11 through which the end mill penetrates in the axial direction. The end mill 20 can penetrate the through hole 11 to make a reserved hole for the workpiece W. In one embodiment, the through hole 11 of the jaw 10 is composed of a small diameter portion 11a and a large diameter portion 11b located on the outer side of the small diameter portion 11a (the side opposite to the side in contact with the workpiece W). The detailed content will be explained in item B.

In one embodiment, the optical film includes a polarizer. The optical film containing the polarizer may be a single polarizer or a film containing the polarizer and other layers. Examples of other layers include a protective layer for protecting a polarizer, a layer composed of any appropriate optical function layer, and the like. In one embodiment, the optical film including the polarizer may use a polarizer. The polarizer may include a polarizer and a protective layer disposed on at least one side of the polarizer. In addition, the film containing the polarizer can also use a laminate of a polarizer, a surface protection film, and/or a separator. The surface protection film or the separator can be laminated on the polarizing plate in a peelable manner through any suitable adhesive. The "surface protective film" in this manual is a film that temporarily protects the polarizing plate, which is different from the protective layer (layer that protects the polarizer) provided by the polarizing plate.

The representative of the polarizer can be processed by swelling, stretching, dyeing, cross-linking, and cleaning with dichroic substances (such as iodine, organic dyes, etc.) on resin films (such as polyvinyl alcohol resin films). , Drying and other treatments. Generally speaking, the polarizer obtained by the stretching process has the characteristics of being prone to cracks, but the present invention can cut the optical film containing the polarizer while preventing cracks.

The thickness of the optical film including the polarizer is not particularly limited, and an appropriate thickness can be adopted according to the purpose, for example, 20 μm to 200 μm. The thickness of the polarizer is also not particularly limited, and an appropriate thickness can be adopted according to the purpose. The thickness of the polarizer is typically about 1μm~80μm, preferably 3μm~40μm.

A-2. Opening steps Next, the workpiece W is bored by the end mill 20. The drilling of the workpiece can be carried out by rotating the end mill while making the end mill penetrate the workpiece. In one embodiment, as shown in Figure 1(b), the end mill is used to lower the end mill to make a hole in the workpiece, and the end mill is rotated in the horizontal direction as shown in Figure 1(c). Move to cut the inner peripheral surface of the reserved hole. In the present invention, a cantilever end mill 20 is used to make a reserved hole for the workpiece W. The end mill 20 in the cantilever state is an end mill in a state where one end 21 (shank side end) of the end mill 20 in the axial direction is held, and represents that the upper end of the upper end mill 20 is held. In FIG. 1, one end 21 of the end mill 20 is held by a holding portion 40. Furthermore, in the present invention, one end 21 (shank side end) and the other end 22 (blade side end) in the axial direction are used to cut the inner peripheral surface of the reserved hole with the end mill 20 in a fixed state at both ends. . The so-called end mill in the fixed state of both ends means that the upper end and lower end of the upper end mill are held.

According to the present invention, by cutting the inner peripheral surface of the reserved hole with the end mill in a fixed state at both ends, the end mill can be prevented from shaking and bending, and a hole with excellent inner peripheral surface quality can be made. Specifically, each layer of the optical film can be prevented from embossing (e.g., surface protection film embossment, separator embossment), interlayer peeling, cracks, etc., and holes with excellent inner peripheral surface quality can be made. Moreover, according to the present invention, a hole with good dimensional accuracy can be formed. Specifically, in the past, if the thickness of the workpiece is increased, the size of the optical film in the workpiece will be more variable due to end mill shaking, deflection, etc. However, according to the manufacturing method of the present invention, even if the thickness of the workpiece is increased , It is still possible to open holes for each optical film with excellent dimensional accuracy, not to mention the situation when the workpiece is thin. Furthermore, according to the present invention, when a small diameter hole is formed, even when a thin and low-strength end mill is used, it is possible to perform hole drilling with excellent inner peripheral surface quality and high dimensional accuracy.

As shown in FIG. 1, the end mill 20 has a rotating shaft extending in the stacking direction (vertical direction) of the workpiece W, and a cutting edge configured to be the outermost diameter of the body that rotates around the rotating shaft. The cutting edge is preferably formed as the outermost diameter twisted along the axis of rotation as shown in Fig. 1. The helix angle of the cutting edge is preferably 70° or less, preferably 65° or less, and more preferably 45° or less. The cutting edge includes a blade edge, a rake face and a flank face. The number of cutting edges can be set appropriately as long as the desired number of contacts described later can be obtained. The number of blades should be 3 pieces. With the above-mentioned structure, the rigidity of the blade can be ensured, the chip pocket can be ensured, and the chips can be discharged well.

In one embodiment, the outer diameter of the end mill at the thickest part is less than 6mm, preferably 1mm~4mm, more preferably 1.6mm~3.7mm. In addition, the "outer diameter of the end mill" in this specification means the distance from the rotation axis to one blade edge multiplied by 2 times.

The total length of the end mill, the length of the shank and the length of the blade can be set to any appropriate length according to the thickness of the workpiece. The total length of the end mill is, for example, 20mm~90mm, and preferably 30mm~70mm. The length of the shank of the end mill is, for example, 15mm~40mm, and preferably 20mm~30mm. The length of the edge of the end mill is, for example, 5mm~50mm, and preferably 15mm~40mm. The length of each part of the end mill is preferably as short as possible within the range of the workpiece. By using a short end mill, it is possible to suppress the end mill shaking, deflection, etc., and it is possible to drill holes with excellent quality on the inner peripheral surface with excellent dimensional accuracy.

The Vickers hardness of the end mill should be HV900~HV7000, HV1000~HV5000, more preferably HV1200~HV3000. Vickers hardness is measured in accordance with the test method specified in JIS Z2244:2009.

In one embodiment, as shown in FIG. 1, the other end 22 of the end mill has a pointed cone shape. As long as the end mill of this shape is used, the inner peripheral surface can be drilled with good quality. The top angle of the other end of the end mill should be 10°~170°, 15°~100°, more preferably 20°~60°.

The processing conditions when opening the reserved hole can be appropriately set according to the desired shape. For example, the number of rotations of the end mill when opening the reserved hole should be 1000rpm~60,000rpm, and should be 10000rpm~40,000rpm.

The end mill used when opening the reserved hole and the end mill used when cutting the inner peripheral surface of the reserved hole can be the same end mill or different end mills. In one embodiment, the end mill used when opening the reserved hole is directly used to cut the inner peripheral surface of the reserved hole (that is, the end mill is not exchanged, and the reserved hole is opened and the reserved hole is cut. Inner peripheral surface). In one embodiment, the end mill is temporarily moved away from the workpiece after the reserved hole is opened and before the inner peripheral surface of the reserved hole is cut, so that the end mill is idling. Through this method, centrifugal force can be used to remove the chips attached to the end mill, and it is possible to prevent defects that are mainly caused by chips when cutting the inner peripheral surface. The number of rotations of the end mill when idling is, for example, 10,000 rpm to 70,000 rpm, and preferably 20,000 rpm to 60,000 rpm. In addition, when removing chips, air can be blown to the end mill.

In one embodiment, after the reserved hole is opened, the end mill is moved (for example, moved horizontally) in a plane orthogonal to the axis direction to cut the inner peripheral surface of the reserved hole. By cutting the inner circumferential surface of the reserved hole, a hole with good inner circumferential surface can be formed. In another embodiment, instead of moving the end mill in the plane, the workpiece is moved in a plane orthogonal to the axial direction of the end mill to cut the inner peripheral surface of the reserved hole. In yet another embodiment, the end mill and the workpiece are moved in a plane orthogonal to the axial direction of the end mill to cut the inner peripheral surface of the reserved hole. The cutting amount of the inner peripheral surface of the reserved hole can be set to any appropriate cutting amount according to the desired hole size. In one embodiment, the cutting amount (cutting thickness) of the inner peripheral surface of the reserved hole is preferably 0.01 mm to 1 mm, preferably 0.02 mm to 0.7 mm, and more preferably 0.05 mm to 0.4 mm. The cutting of the inner peripheral surface of the reserved hole can be divided into multiple times. In one embodiment, the cutting of the above-mentioned cutting amount is performed in 2 to 4 times.

As described above, when cutting the inner peripheral surface of the reserved hole, the end of the end mill on the side (the other end) opposite to the side held at the time of opening the reserved hole will be further held. The other end of the end mill can be held in any suitable method. The holding method can be, for example, a method of holding by a supporting unit arranged on one side (for example, the lower side) of the workpiece; a method of using the centrifugal force of the end mill to move the clamp mechanism to clamp the other end of the end mill Method; for example, a method of clamping the end mill side with a clamp mechanism that can be pressed by air or the like.

In one embodiment, as shown in FIG. 1(c), when cutting the inner peripheral surface of the reserved hole, the other end 22 of the end mill 20 abuts against the support unit 30 and is held. The supporting unit is preferably configured to be capable of loading and unloading the end mill. When the supporting unit is in the attached state, the other end of the end mill is held. The method of using the support unit to hold can include, for example, a method of pressing the support unit to the end mill along the axis direction; a method of screwing the other end of the end mill into the support unit to fix the end mill and the support unit. The above-mentioned supporting unit should preferably rotate in accordance with the rotation of the held end mill.

In one embodiment, the support unit can move along the axial direction of the end mill, which means that the upper system is configured to be movable in the up and down direction. The supporting unit constructed in the manner described can be pressed to the other end of the end mill under a predetermined pressure to hold the other end of the end mill. The movement of the supporting unit can be carried out in any appropriate method. In one embodiment, the movement of the support unit can be performed by air pressure, oil pressure, etc. The support unit should be moved by air pressure. Although not shown in the figure, the supporting unit can be connected to any appropriate shaft, and the shaft can be moved by moving the shaft up and down. In addition, a bearing or the like may be arranged at the connecting portion of the supporting unit and the shaft, the supporting unit may be configured to be rotatable, and the supporting unit may be configured to rotate in accordance with the rotation of the held end mill.

The pressing pressure of the support unit to the end mill should be above 0.01MPa, and should be 0.03MPa~1MPa, more preferably 0.05MPa~0.5MPa, especially 0.1MPa~0.3MPa. As long as it is within the above range, a moderate frictional force can be generated between the other end of the end mill and the support unit, and the end mill can be maintained well. In addition, it is possible to prevent the end mill from wear and breakage while maintaining the end mill well.

Preferably, as shown in FIGS. 1 and 2, the supporting unit 30 has a recess 31. The recess 31 may be configured to receive the other end 22 of the end mill 20. By providing a recess in the support unit, it is possible to prevent the end mill from shaking, bending, etc., and it becomes possible to make holes with excellent dimensional accuracy on the inner peripheral surface. In addition, the configuration with the recessed portion is also advantageous from the viewpoint that the positioning of the other end of the end mill can be performed reliably, whereby a hole with excellent quality of the inner peripheral surface can be made with excellent dimensional accuracy. The shape of the recess can be made into any appropriate shape according to the shape of the other end of the end mill. For example, when the other end of the end mill is tapered, the above-mentioned recess may also be tapered. The bottom angle of the above recess should be the top angle of the other end of the end mill ±10°, and it should be (the top angle of the other end of the end mill -5°) ~ (the top angle of the other end of the end mill +8 °), more preferably (the top angle of the other end of the end mill -1°)~(the top angle of the other end of the end mill +5°), especially the top angle of the other end of the end mill ±1 °. As long as it is within the above range, the other end of the end mill can be positioned accurately, and the end mill can be maintained with excellent retention force.

In one embodiment, the diameter of the opening of the recess 31 is preferably smaller than the outer diameter of the thickest part of the end mill 20. The difference between the diameter of the opening of the recess and the outer diameter of the thickest part of the end mill (the outer diameter of the thickest part of the end mill 20-the diameter of the opening of the recess 31) is preferably 0.1mm~4mm, more preferably 0.5mm~2mm. In another embodiment, the diameter of the opening of the recess 31 may be the same as the outer diameter of the thickest part of the end mill 20. In yet another embodiment, the diameter of the opening of the recess 31 is larger than the outer diameter of the thickest part of the end mill 20.

The Vickers hardness of the part abutted by the aforementioned end mill in the support unit (for example, the inner surface of the aforementioned recess of the support unit) should preferably be HV45~HV800, preferably HV80~HV700, and more preferably HV200~HV600. As long as it is within the above range, it is possible to prevent the end mill from wear and breakage. The Vickers hardness of the part abutted by the above-mentioned end mill in the support unit should be lower than that of the end mill. The Vickers hardness of the part abutted by the end mill in the support unit should be 1%~80%, preferably 8%~70%, and more preferably 17%~50 relative to the Vickers hardness of the end mill. %. As long as it is within the above range, it is possible to prevent the end mill from wear and breakage.

In one embodiment, the support unit 30 is configured to be movable in a plane perpendicular to the axial direction of the end mill. When the end mill is moved in a plane orthogonal to the axial direction (for example, it is moved horizontally) to cut the inner peripheral surface of the reserved hole, it is advisable to make the support unit 30 move in the plane in conjunction with the end mill.

The machining conditions when cutting the inner peripheral surface of the reserved hole can be appropriately set according to the desired shape. For example, the number of rotations of the end mill when cutting the inner peripheral surface of the reserved hole should be 1000rpm~60000rpm, and should be 10000rpm~40,000rpm. The feed speed of the end mill (relative speed to the workpiece) should be 10mm/min~5000mm/min, more preferably 50mm/min~1000mm/min.

After cutting the inner peripheral surface of the reserved hole, the end mill will retreat to one end side (the shank side) of the end mill, away from the workpiece. At this time, the support unit 30 can also move in a direction opposite to the retreat direction of the end mill, that is, move away from the end mill in the axial direction.

B. Opening device As shown in FIGS. 1 and 2, the hole drilling device of the present invention includes a pair of jaws 10, an end mill 20 with one end 21 held, and a support unit 30 configured to hold the other end 22 of the end mill 20. The perforating device of the present invention can be used, for example, for perforating the workpiece W (a laminate of optical films) as described in the above item A.

The clamp 10 is configured to be able to clamp the workpiece W. The jaw 10 has a through hole 11 through which the end mill 20 penetrates in the axial direction.

In one embodiment, the through hole 11 of the jaw 10 is composed of a small diameter portion 11a and a large diameter portion 11b located on the outer side of the small diameter portion 11a (the side opposite to the side in contact with the workpiece W). The large diameter portion 11b has a shape in which the diameter of the through hole 11 becomes larger toward the outside.

The diameter of the small diameter part 11a should be (diameter of end mill +0.1mm)~(diameter of end mill +5mm), more preferably (diameter of end mill+0.3mm)~(diameter of end mill+ 1mm).

The shape of the large-diameter portion 11b on the side that is the entrance of the end mill 20 can be determined by the shape of the holding portion 40 that holds one end 21 of the end mill 20. On the side as the entrance of the end mill 20, the shape of the large-diameter portion 11b is preferably such that at least a part of the holding portion 40 can be inserted into the large-diameter portion 11b. The shape of the large-diameter portion 11b is on the side of the exit of the end mill 20 and can be determined according to the shape of the support unit 30. On the side as the outlet of the end mill 20, the shape of the large diameter portion 11b is preferably such that at least a part of the support unit 30 can be inserted into the large diameter portion 11b. As long as the large-diameter portion 11b has the above-mentioned shape, an end mill with a short overall length can be used, and the end mill can be prevented from shaking and bending. As a result, the hole-opening device of the present invention can perform hole-opening with good inner peripheral surface quality and good dimensional accuracy.

The configuration of the end mill 20 is as described in item A above.

The hole-opening device 100 is configured to cut the inner peripheral surface of the reserved hole in the workpiece W. Specifically, the end mill 20 and/or the clamp 10 are configured to be movable in a plane orthogonal to the axial direction of the end mill, and the end mill 20 and/or the clamp 10 move in the plane The inner peripheral surface of the reserved hole can be cut.

The supporting unit 30 may be configured to face the end mill 20. The structure of the support unit 30 is as described in item A above. Example

Hereinafter, the present invention will be specifically described with examples, but the present invention is not limited by these examples.

[Example 1] Manufactured by conventional methods with separator (38μm)/adhesive layer (15μm)/acrylic protective film (20μm)/polarizer (5μm)/brightness enhancement film (26μm)/surface protection in order from the viewing side Optical film (polarizing plate) composed of thin film (60μm). The adhesive layer is produced in accordance with [0121] and [0124] of JP 2016-190996 A. The obtained optical film was punched into a shape similar to that shown in Fig. 1 (approximately about 140mm×65mm in size). Laminate multiple punched optical films to form a workpiece (total thickness about 20mm). As shown in Figure 1, with the obtained workpiece clamped in a clamped state, an end mill (length of the blade 30mm, diameter 2mm) is used to make a reserved hole. After that, as shown in Figure 1, the end mill on the edge side of the end mill is held by the support unit, and the end mill is moved in the horizontal direction to cut the inner peripheral surface of the reserved hole in 2 times (each time The cutting amount is 0.1mm), and a hole with a diameter of 2.5mm is formed. In addition, the supporting unit is attached to the end mill with an air pressure of 0.15 MPa. (Evaluation) 10 workpieces such as the examples and comparative examples were drilled, and for each workpiece (optical film) after processing, 1 polarizing plate was drawn from the upper side, the middle part, and the lower side respectively, that is, a total of 3 polarizing plates, for 30 Sheet polarizer (3 sheets×10 work pieces) to confirm whether the holes have surface protection film embossment, separator embossment, and interlayer peeling between the polarizer/protective film. As a result, there were no samples in which the surface protection film embossment was observed at a width of 500 μm or more, and there were no samples in which the separation member embossment or interlayer peeling was observed. In addition, one polarizing plate is drawn out from the upper side, the middle part, and the lower side, that is, a total of 3 polarizing plates. For each polarizing plate, a CNC image measurement system (manufactured by Nikon Corporation, trade name "NEXIV") is used to measure the inner peripheral surface of the hole. Dimensional accuracy. As a result, no matter what kind of sample, the optical film was obtained with dimensional accuracy within ±0.05mm from the specification value.

[Example 2] Except that the pressing pressure of the support unit was set to 0.1 MPa, the hole processing was performed in the same manner as in Example 1. (Evaluation) The same evaluation as in Example 1 was performed. As a result, there were no samples in which the surface protection film embossment was observed at a width of 500 μm or more, and there were no samples in which the separation part embossment or interlayer peeling was observed. In addition, the dimensional accuracy is within ±0.05mm of the specification value.

[Comparative Example 1] Except that the inner peripheral surface of the reserved hole was cut without holding the end of the end mill on the blade side, the drilling was performed in the same manner as in Example 1. (Evaluation) The same evaluation as in Example 1 was performed. As a result, surface protection film embossments and separator embossments were observed in widths of 500 μm or more, and interlayer peeling was observed in widths of 100 μm or more. In addition, the dimensional accuracy cannot satisfy the specification value within ±0.05 mm.

Industrial availability The perforated optical film of the present invention can be suitably used for rectangular image display parts represented by mobile terminals and/or irregular image display parts represented by automobile instrument panels and smart watches.

10: clamp 11: Through hole 11a: Small diameter part 11b: Large diameter part 20: End mill 21: One end of end mill 22: The other end of the end mill 30: Support unit 31: recess 40: holding part 100: Opening device W: Workpiece

Fig. 1 is a schematic perspective view for explaining an example of a drilling process and a drilling device according to an embodiment of the present invention. Fig. 2 is a schematic cross-sectional view for explaining an example of drilling and drilling device according to an embodiment of the present invention.

10: clamp

11: Through hole

11a: Small diameter part

11b: Large diameter part

20: End mill

21: One end of end mill

22: The other end of the end mill

30: Support unit

31: recess

40: holding part

W: Workpiece

Claims (12)

A method for manufacturing an optical film with a hole processing, including the following steps: Laminating multiple optical films to form a workpiece; and Use an end mill to perform hole-opening steps on the workpiece; The opening steps include: After opening a reserved hole on the workpiece with an end mill in the cantilever state maintained at one end of the axis, The inner peripheral surface of the reserved hole is cut by an end mill in a fixed state at one end and the other end in the axial direction. For example, the manufacturing method of a hole-cutting optical film of claim 1, wherein when cutting the inner peripheral surface of the reserved hole, the other end of the aforementioned end mill abuts against the supporting unit and is held. According to claim 2, the method for manufacturing a holed optical film, wherein the support unit is configured to be attachable and detachable to the end mill. Such as claim 2 or 3 of the method for manufacturing a hole-cutting optical film, wherein the supporting unit can move along the axis of the end mill. According to the method for manufacturing an optical film processed with a hole in any one of claims 2 to 4, wherein the pressing pressure of the supporting unit to the end mill is 0.01 MPa or more. According to the method for manufacturing a holed optical film according to any one of claims 2 to 5, wherein the support unit has a recess configured to accept the other end of the end mill. According to the method for manufacturing a holed optical film according to any one of claims 2 to 6, wherein the Vickers hardness of the part abutted by the end mill in the support unit is HV45~HV800. According to any one of claims 1 to 7, the method for manufacturing an optical film with a hole processing, wherein the other end of the aforementioned end mill has a pointed cone shape. For example, the method of manufacturing an optical film with perforated processing in claim 6 of claim 8, wherein the bottom angle of the aforementioned recess is ±10° of the top angle of the other end of the aforementioned end mill. Such as the manufacturing method of a holed optical film of any one of claims 1 to 9, wherein the Vickers hardness of the aforementioned end mill is HV900~HV7000. The method for manufacturing a perforated optical film according to any one of claims 1 to 10, wherein the outer diameter of the thickest part of the aforementioned end mill is 6 mm or less. An opening device with: A pair of clamps that can hold a workpiece, an end mill with one end held, and a support unit, the support unit is arranged opposite to the end mill and configured to hold the other end of the end mill; The clamp has a through hole that penetrates the end mill in the axial direction, The through hole is composed of a small diameter part and a large diameter part located outside the small diameter part, and The large-diameter portion has a shape in which the through-hole diameter increases toward the outside.

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