JP7278091B2 - Method for manufacturing optical film - Google Patents

Description

The present invention relates to a method for producing an optical film.

2. Description of the Related Art Various optical films (eg, polarizing plates) are used in image display devices such as mobile phones and notebook personal computers in order to realize image display and/or improve the performance of the image display. In recent years, there has been a demand for use of optical laminates in instrument panels of automobiles, smart watches, and the like, and it is desired to process the shape of the optical laminates into a desired shape. During such processing, the end face may be cut with an end mill. In such a case, the surface to be ground is subjected to end milling a plurality of times, such as finishing after roughing.

In the above-mentioned end milling, it is assumed that there is a mistake in the process such that after rough cutting, the workpiece is not finished and is turned into a product or flowed out to the next process. It is difficult to judge whether or not the product has been finished by visual quality inspection, and the introduction of a predetermined inspection device complicates the process and is disadvantageous in terms of cost.

Japanese Patent Application Laid-Open No. 2007-187781 JP 2018-022140 A

The present invention has been made to solve the above-mentioned conventional problems, and the main purpose thereof is to provide a method for manufacturing an optical film cut by end milling multiple times, and to easily determine whether or not finishing is performed. To provide a manufacturing method capable of

The method for producing an optical film of the present invention includes forming a work by stacking a plurality of optical films, and an end milling step of cutting the outer peripheral surface of the work with an end mill. A roughing step of roughing the outer peripheral surface with an end mill, and finishing the roughed outer peripheral surface of the work with an end mill, wherein the roughing step includes providing an uncut portion on the outer peripheral surface of the work, The finishing includes cutting the uncut portion.
In one embodiment, in the above optical film manufacturing method, in the rough cutting step, at the start of cutting, the end mill is brought into contact with the work while running the end mill obliquely with respect to the work in plan view. and forming the uncut portion by setting a place where cutting is started and a place where cutting is finished on the workpiece at different positions.
In one embodiment, in the method for manufacturing an optical film, in the rough cutting step, at the end of cutting, the end mill is separated from the work while the end mill is run obliquely with respect to the work in a plan view. Including.

According to the present invention, it is possible to provide a manufacturing method for manufacturing an optical film that has been cut by end milling a plurality of times, in which it is possible to easily determine the presence or absence of finish processing.

It is a schematic perspective view for demonstrating an example of the cutting of the optical film of this invention. 1 is a schematic perspective view for explaining an example of an end mill used for cutting in the method for producing an optical film of the present invention; FIG. FIG. 3(a) is a schematic sectional view seen from the axial direction for explaining another example of cutting means used for cutting in the method for producing an optical film of the present invention; Figure 3(b) is a schematic perspective view of the cutting means of Figure 3(a); 4(a) to 4(c) are schematic partial plan views of a workpiece for explaining uncut portions in the method for producing an optical film of the present invention. FIGS. 5(a) and 5(b) are schematic plan views explaining the roughing step in the method for manufacturing an optical film according to one embodiment of the present invention. 6(a) and 6(b) are schematic plan views illustrating cutting according to one embodiment of the present invention. 7(a) and 7(b) are schematic plan views illustrating cutting according to one embodiment of the present invention. 1 is a schematic plan view illustrating a workpiece in one embodiment of the present invention; FIG. 9(a) and 9(b) are schematic plan views illustrating cutting according to one embodiment of the present invention. 10(a) and 10(b) are schematic plan views illustrating cutting according to one embodiment of the present invention.

Specific embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. The drawings are shown schematically for the sake of clarity, and the ratios of length, width, thickness, etc., and angles, etc. in the drawings are different from the actual ones.

The method for manufacturing a machined optical film of the present invention includes stacking a plurality of optical films to form a work, and an end milling step of cutting the outer peripheral surface of the work with an end mill.

<<Formation of workpiece>>
FIG. 1 is a schematic perspective view for explaining cutting, and a workpiece 1 is shown in this figure. As shown in FIG. 1, a workpiece 1 is formed by stacking a plurality of optical films. The optical film is typically cut into any suitable shape when forming a workpiece. Specifically, the optical film may be cut into a rectangular shape, may be cut into a shape similar to a rectangular shape, or may be cut into an appropriate shape (for example, a circle) according to the purpose. good. In the illustrated example, the optical film is cut into a rectangular shape, and the workpiece 1 has outer peripheral surfaces (cutting surfaces) 1a and 1b facing each other and outer peripheral surfaces (cutting surfaces) 1c and 1d orthogonal thereto. . The workpiece 1 is preferably clamped from above and below by clamping means (not shown). The total thickness of the work is, for example, 8 mm to 100 mm, preferably 8 mm to 50 mm, more preferably 8 mm to 20 mm, still more preferably 9 mm to 15 mm, and still more preferably about 10 mm. With such a thickness, it is possible to prevent damage due to pressing by the clamping means or impact during cutting. The optical films are stacked so that the workpiece has such a total thickness. The number of optical films constituting the work may be, for example, 10 to 500 (10 to 300 in one embodiment; 10 to 50 in another embodiment). The clamping means (e.g., jig) may be composed of a soft material or a hard material. When composed of a soft material, its hardness (JIS A) is preferably 20° to 80°, more preferably 60° to 80°, and its thickness is, for example, 0.3 mm to 5 mm. If the hardness is too high, there may be impressions left by the clamping means. If the hardness is too low or too thick, the deformation of the jig may cause misalignment, resulting in insufficient cutting accuracy.

<<End mill processing process>>
Next, in an end milling step, the outer peripheral surface of the workpiece 1 is cut by an end mill 20 . Cutting is performed by bringing a cutting edge of an end mill into contact with the outer peripheral surface of the workpiece 1 . Cutting may be performed over the entire circumference of the outer peripheral surface of the work, or may be performed only at predetermined positions. Also, for a workpiece having a hole, the inner peripheral surface of the hole may be cut by bringing the cutting edge of an end mill into contact with the inner peripheral surface of the hole. A straight end mill can be typically used as the end mill 20 . In cutting, only the end mill may be moved, only the work may be moved, or both the end mill and the work may be moved.

As shown in FIGS. 2 and 3, the end mill 20 has a rotary shaft 21 extending in the stacking direction (vertical direction) of the workpieces 1, and a cutting blade 22 having the outermost diameter of a main body that rotates around the rotary shaft 21. and have The cutting edge 22 may be configured as an outermost diameter twisted along the axis of rotation 21 as shown in FIG. 21 may be configured to extend in a direction substantially parallel (the twist angle may be 0°). It should be noted that "0°" means substantially 0°, and includes the case where there is a slight angle twist due to processing error or the like. When the cutting edge has a predetermined helix angle, the helix angle is preferably 70° or less, more preferably 65° or less, and even more preferably 45° or less. The cutting blade 22 includes a cutting edge 22a, a rake face 22b, and a relief face 22c. The number of blades of the cutting blade 22 can be appropriately set as long as a desired number of contacts, which will be described later, can be obtained. Although the number of blades in FIG. 2 is three and the number of blades in FIG. 3 is two, the number of blades may be one, four, or five or more. Preferably, the number of blades is two. With such a configuration, the rigidity of the blade is ensured, and the pocket is ensured, so that the shavings can be discharged satisfactorily. In one embodiment, an end mill with a helix angle of 0° is used.

In the end milling process, a roughing process is performed in which the outer peripheral surface of the work is roughed with an end mill, and further, the outer peripheral surface of the roughed work is finished with an end mill. The roughing process and the finishing process are performed to improve cutting accuracy. The outer peripheral surface of the work is cut with a thickness of 0.01 mm to 0.2 mm, for example. In the rough cutting process and the finishing process, the surface to be ground may be cut with an end mill a plurality of times.

<Rough cutting process>
In the present invention, an uncut portion is provided on the outer peripheral surface of the workpiece in the rough cutting step. FIGS. 4(a) to 4(c) are schematic partial plan views of the work for explaining uncut portions. The uncut portion 11 is a portion that has not been cut by an end mill. Typically, the uncut portion 11 is formed as a projection formed on the outer peripheral surface of the workpiece 1, as shown in FIGS. 4(a) to 4(c).

The uncut portion is cut in the finishing process, which is a post-process. According to the present invention, by providing an uncut portion in the rough cutting process, it becomes possible to easily determine whether or not the product (or semi-finished product) has been obtained through finishing processing based on the presence or absence of the uncut portion. . That is, a work or optical film that has no uncut portion can be judged to be a normal product obtained through finishing, while a work or optical film that has an uncut portion is a defective product that has not been finished. Alternatively, it can be determined to be a semi-finished product that should be finished.

The shape of the uncut portion 11 can be defined by the running locus of the end mill. In one embodiment, an uncut portion is formed by setting a place where cutting is started and a place where cutting is finished on the workpiece at different positions. More specifically, as shown in the end mill's running locus t shown in FIG. The uncut portion 11 shown in FIG.

The shape of the uncut portion 11 is not particularly limited, and shapes as shown in FIGS. 4(a) to 4(c) are exemplified. The width of the uncut portion (width w in FIG. 4) is preferably 0.1 mm to 30 mm, more preferably 0.5 mm to 10 mm, still more preferably 1 mm to 2 mm. The height of the uncut portion (height h in FIG. 4) is preferably 0.05 mm to 1 mm, more preferably 0.1 mm to 0.5 mm.

In one embodiment, the outer diameter of the end mill used in the roughing step is 10 mm or less, preferably 3 mm to 9 mm, more preferably 4 mm to 6 mm. In this specification, the "outer diameter of the end mill" refers to the distance from the rotating shaft to one cutting edge doubled.

The cutting conditions in the rough cutting process can be appropriately set according to the desired shape. For example, the end mill rotation speed is preferably 1000 rpm to 60000 rpm, more preferably 10000 rpm to 40000 rpm. The feeding speed of the end mill is preferably 500 mm/min to 10000 mm/min, more preferably 500 mm/min to 2500 mm/min. In this specification, the speed of the end mill is the speed relative to the work.

In one embodiment, at the start of cutting, the end mill is brought into contact with the work while running the end mill obliquely with respect to the work in plan view. In this specification, the term "oblique direction to the workpiece" at the start of cutting refers to the side A of the workpiece including the cutting start point a behind the running direction of the end mill after the start of cutting, with reference to the cutting start point a. Alternatively, it means a direction in which the angle x (angle x in FIG. 6) formed with the tangent line B of the workpiece at the cutting start point a is 60° or less. Further, "a direction oblique to the work" means a direction that does not include a direction perpendicular or nearly perpendicular to the work, that is, includes a direction in which the angle x is 0°. In this specification, the angle x is referred to as the running angle x of the end mill at the start of cutting. When the cutting start point a is on a straight line, the running angle x of the end mill at the start of cutting is defined from the side A of the workpiece including the cutting start point a and the running trajectory of the end mill (Fig. 6). When the point a is on the curve, the running angle x of the end mill at the start of cutting is defined from the tangent line B to the workpiece at the cutting start point a and the running locus of the end mill (FIG. 7). In this specification, the "cutting start point a" means a point where the end mill starts to cut the outer periphery of a work having a predetermined thickness.

In one embodiment, in the roughing step, at the start of cutting, the end mill is brought into contact with the work while running the end mill obliquely with respect to the work in a plan view, and the point where cutting is started on the work. A non-cut portion is formed by setting the cutting end point to a different position.

6(a) and 6(b) are schematic plan views illustrating cutting according to one embodiment of the present invention. 7(a) and 7(b) are schematic plan views illustrating cutting according to another embodiment of the present invention. 6(a) and 6(b), and FIGS. 7(a) and 7(b), the motion of the end mill (relative motion with respect to the workpiece 1) at the start of cutting is represented by the traveling trajectory in plan view. ts. In FIGS. 6A and 6B, the workpiece 1 has a substantially rectangular shape. In FIGS. 7(a) and (b), the contour of the workpiece 1 includes curved lines. The running locus ts of the end mill at the start of cutting may be curved as shown in FIGS. 6(a) and 7(a), or linear as shown in FIGS. may be in the form of The running angle x of the end mill at the start of cutting is, as described above, 60° or less, preferably 0° or more and 60° or less, more preferably 0° or more and 45° or less, and still more preferably 0° or more and 40°. ° or less, particularly preferably 0° or more and 35° or less. As described above, the travel angle x may be 0°, for example, if the contour of the workpiece 1 includes curves, the travel angle x may be set to 0°. In one embodiment, if the workpiece 1 is substantially rectangular, the travel angle x can be set to an angle greater than 0°. By bringing the end mill into contact with the work while running the end mill obliquely with respect to the work, it is possible to prevent the generation of unnecessary concave portions at the starting point of cutting. The running angle x of the end mill at the start of cutting is preferably as close to 0° as possible. In one embodiment, the running angle x is 5° or less (preferably 3° or less, more preferably 1° or less, still more preferably 0 .5° or less).

In one embodiment, the running locus ts of the end mill at the start of cutting is curved. By forming the running locus ts of the end mill at the start of cutting into a curved shape, the effect of the present invention becomes more remarkable. When the running locus ts is curved, the running angle x of the end mill at the start of cutting is determined by the tangent line us of the running locus ts at the cutting start point a and the tangent line B at the side A of the workpiece or the cutting start point a. Defined. In one embodiment, the end mill is caused to travel relative to the work along a curved travel locus ts by bringing the end mill and the work closer together while rotating the work in-plane. When bringing the end mill and the work closer, the work may be brought closer to the fixed end mill, the end mill may be moved linearly to bring the end mill and the work closer, or both the end mill and the work may be moved linearly. The end mill and the workpiece may be moved closer together.

When the running locus ts of the end mill at the start of cutting is curved, the radius of curvature of the running locus ts is preferably 1/2 or more of the outer diameter of the end mill, and more preferably larger than the outer diameter of the end mill. It is more preferably 110% or more of the outer diameter of the end mill, particularly preferably 130% or more of the outer diameter of the end mill, and preferably 150% or more of the outer diameter of the end mill. Most preferred. With such a range, it is possible to prevent the occurrence of unnecessary concave portions at the cutting start point a. Further, when the running locus ts of the end mill at the start of cutting is curved, the radius of curvature of the running locus ts is preferably 4 mm or more, more preferably 6 mm or more, and still more preferably 7.5 mm or more. be.

The speed of the end mill when the end mill is brought into contact with the work is preferably lower than the feed speed of the end mill during cutting (when the surface to be cut of the work is cut with the end mill). By slowing the speed of the end mill at the start of cutting, rattling of the workpiece can be suppressed. In one embodiment, the speed of the end mill is preferably 400 mm/min to 1200 mm/min, more preferably 500 mm/min to 900 mm/min when the end mill is brought into contact with the workpiece. In one embodiment, for example, when cutting the inner peripheral surface of a work having a hole, the speed of the end mill when the end mill is brought into contact with the work is preferably 30 mm/min to 1200 mm/min. and more preferably 50 mm/min to 1000 mm/min.

The shape of the workpiece (ie, optical film) can be any suitable shape. Examples of the shape of the workpiece include, for example, a substantially rectangular shape as shown in FIG. 6, a substantially polygonal shape, a substantially circular shape, a substantially elliptical shape, and the like. Moreover, the shape of the workpiece may be a shape obtained by appropriately combining straight lines and curved lines, or a shape composed of a plurality of curves having different curvatures. Note that the above-mentioned work does not have to be purely rectangular, polygonal, circular, elliptical, or the like, and may have a shape obtained by adding a deformed portion to these shapes. In this specification, for example, a rectangular shape to which a deformed portion is added is included in the “substantially rectangular shape”. Examples of the deformed portion include concave portions as shown in FIG. 6, convex portions, holes, and the like. Further, the workpiece may have a rectangular shape with curved corners.

In addition, the cutting method (specifically, the travel locus of the end mill at the start of cutting and the travel locus of the end mill at the end of cutting, which will be described later) is based on the workpiece 1 having the hole 11 as shown in FIG. ' can also be applied when cutting the inner peripheral surface of the hole 11 .

In one embodiment, at the end of cutting, the end mill is moved away from the work while running the end mill obliquely with respect to the work in plan view. In this specification, the "oblique direction with respect to the workpiece" at the end of cutting refers to the side A of the workpiece including the cutting end point b in front of the running direction of the end mill before the end of cutting with reference to the cutting end point b. Alternatively, it means a direction in which the angle y (angle y in FIG. 9) formed by the tangent line B' of the workpiece at the cutting end point b is 60° or less. As described above, the "oblique direction with respect to the workpiece" means a direction that does not include a perpendicular direction or a nearly perpendicular direction with respect to the workpiece, that is, includes a direction in which the above angle y is 0°. In this specification, the angle y is referred to as the travel angle y of the end mill at the end of cutting. When the cutting end point b is on a straight line, the running angle y of the end mill at the end of cutting is defined from the side A of the workpiece including the cutting end point b and the running trajectory of the end mill (Fig. 9). When the point b is on the curve, the travel angle y of the end mill at the end of cutting is defined from the tangent line B' of the workpiece at the cutting end point b and the travel locus of the end mill (FIG. 10).

9(a) and 9(b) are schematic plan views illustrating cutting according to one embodiment of the present invention. 10(a) and 10(b) are schematic plan views illustrating cutting according to another embodiment of the present invention. 9(a) and 9(b), and FIGS. 10(a) and 10(b), the motion of the end mill (relative motion with respect to the workpiece 1) at the end of cutting is shown in plan view as a running locus te is shown as In FIGS. 9A and 9B, the workpiece 1 has a substantially rectangular shape. 10(a) and 10(b), the contour of the workpiece 1 includes curved lines. The running locus te of the end mill at the end of cutting may be curved as shown in FIGS. 9(a) and 10(a), or straight as shown in FIGS. may be in the form of The running angle y of the end mill at the end of cutting is, as described above, 60° or less, preferably 0° or more and 60° or less, more preferably 0° or more and 45° or less, and still more preferably 0° or more and 40°. ° or less, particularly preferably 0° or more and 35° or less. As described above, the travel angle y may be 0°, for example, if the contour of the workpiece 1 includes curved lines, the travel angle y may be set to 0°. In one embodiment, if the workpiece 1 is substantially rectangular, the travel angle y can be set to an angle greater than 0°. In this specification, the “cutting end point b” means a point where the end mill, which has been traveling to cut the outer periphery of a work having a predetermined thickness, changes its traveling direction in a direction away from the work and finishes cutting. do. In one embodiment, the distance between the "cutting start point a" and the "cutting end point b" corresponds to the width w of the uncut portion.

Preferably, the running locus te of the end mill at the end of cutting is curved. By forming the running locus te of the end mill at the end of cutting into a curved shape, the above effect becomes more remarkable. When the running locus te is curved, the running angle y of the end mill at the end of cutting is the tangent line ue of the running locus te at the cutting end point b and the tangent line B' at the side A of the workpiece or the cutting end point a. Defined by In one embodiment, the end mill is caused to travel relative to the work on a curved travel locus te by separating the end mill and the work while rotating the work in the plane. When separating the end mill and the workpiece, the workpiece may be separated from the fixed end mill, the end mill may be moved linearly to separate the end mill from the workpiece, and both the end mill and the workpiece may be linearly moved. The end mill and the workpiece may be separated by moving.

When the running locus te of the end mill at the end of cutting is curved, the radius of curvature of the running locus te is preferably 1/2 or more of the outer diameter of the end mill, and more preferably larger than the outer diameter of the end mill. It is more preferably 110% or more of the outer diameter of the end mill, particularly preferably 130% or more of the outer diameter of the end mill, and preferably 150% or more of the outer diameter of the end mill. Most preferred. With such a range, it is possible to prevent generation of unnecessary steps and fluff at the cutting end point b. Further, when the running locus te of the end mill at the end of cutting is curved, the radius of curvature of the running locus te is preferably 4 mm or more, more preferably 6 mm or more, and still more preferably 7.5 mm or more. be.

The speed of the end mill when separating the end mill from the work is preferably lower than the feed speed of the end mill during cutting (when cutting the surface of the work to be cut with the end mill). By slowing the speed of the end mill at the end of cutting, rattling of the workpiece can be suppressed. In one embodiment, the speed of the end mill when separating the end mill from the workpiece is preferably 400 mm/min to 1200 mm/min, more preferably 500 mm/min to 900 mm/min. In one embodiment, for example, when cutting the inner peripheral surface of a work having a hole, the speed of the end mill when separating the end mill from the work is preferably 30 mm / min to 1200 mm / min. and more preferably 50 mm/min to 1000 mm/min.

<Finish processing>
After the roughing step, the roughed outer peripheral surface of the workpiece is finished by cutting with an end mill. In finishing, the outer peripheral surface of the workpiece including the uncut portion is cut.

In one embodiment, the outer diameter of the end mill used for finishing is 10 mm or less, preferably 3 mm to 9 mm, more preferably 4 mm to 6 mm.

The cutting conditions in the finishing process can be appropriately set according to the desired shape. For example, the end mill rotation speed is preferably 1000 rpm to 60000 rpm, more preferably 10000 rpm to 40000 rpm. The feeding speed of the end mill is preferably 500 mm/min to 10000 mm/min, more preferably 500 mm/min to 2500 mm/min.

Also in the finishing process, as described above, when starting cutting, the end mill may be brought into contact with the work while running the end mill obliquely with respect to the work in a plan view. Further, when cutting is completed, the end mill may be moved away from the work while running in a direction oblique to the work in a plan view. In finishing machining, the cutting start point and the cutting end point may be at the same position, and the cutting start point and the cutting end point are set at different positions, and the end mill travel direction ahead of the cutting start point is the cutting end point. good too. Preferably, the cutting start point and the cutting end point are set at different positions, and the cutting end point b is set ahead of the cutting start point in the running direction of the end mill. In this way, if the cutting is ended so that the running trajectories of the end mills partially overlap each other during cutting, it is possible to preferably prevent the generation of unnecessary steps and fluffs at the end of cutting.

<<Optical film>>
In one embodiment, the optical film contains a polarizer.

The optical film containing a polarizer may be a polarizer alone or a film containing a polarizer and other layers. Other layers include a protective layer that protects the polarizer, a layer composed of any appropriate optical functional layer, and the like. In one embodiment, a polarizing plate is used as the optical film containing the polarizer. A polarizing plate may comprise a polarizer and a protective layer disposed on at least one side of the polarizer. A laminate of a polarizing plate and a surface protection film and/or a separator may also be used as the film containing the polarizer. The surface protective film or separator is releasably laminated to the polarizing plate via any suitable adhesive. As used herein, a "surface protective film" is a film that temporarily protects a polarizing plate, and is different from a protective layer (a layer that protects a polarizer) that the polarizing plate has.

A polarizer is typically a resin film (e.g., polyvinyl alcohol resin film) subjected to swelling treatment, stretching treatment, dyeing treatment with a dichroic substance (e.g., iodine, organic dyes, etc.), cross-linking treatment, washing treatment, It can be obtained by performing various treatments such as drying treatment. In general, a polarizer obtained through a stretching process tends to crack, but according to the present invention, an optical film containing a polarizer can be cut while preventing cracks.

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

The size of the optical film containing the polarizer is not particularly limited, and may be an appropriate size depending on the purpose. In one embodiment, the optical film containing the polarizer has a rectangular shape including sides parallel to the absorption axis of the polarizer, and the length of the side parallel to the absorption axis of the polarizer is 10 mm to 400 mm. and the length of other sides is 10 mm to 500 mm. As used herein, the term "parallel" includes substantially parallel, and specifically includes an angle of 0° to 5° between two directions.

The cut optical film obtained by the production method of the present invention can be used for liquid crystal image display devices, organic EL image display devices and the like. In addition, the cut optical film can be used for rectangular image display units typified by personal computers (PCs) and tablet terminals, and/or irregular-shaped image displays typified by automobile instrument panels and smart watches. It can be suitably used for parts.

1 work 20 end mill

Claims (3)

Forming a workpiece by stacking a plurality of optical films, and an end milling step of cutting the outer peripheral surface of the workpiece with an end mill,
The end milling step includes a roughing step of roughing the outer peripheral surface of the work with an end mill, and finishing the roughed outer peripheral surface of the work with an end mill,
The roughing step includes providing an uncut portion having a width of 0.1 mm to 30 mm and a height of 0.05 mm to 1 mm on the outer peripheral surface of the work,
the finishing comprises cutting the uncut portion;
A method for producing a machined optical film. In the roughing step, at the start of cutting, the end mill is brought into contact with the work while running the end mill from an oblique direction with respect to the work in a plan view,
Forming the uncut portion by setting a place where cutting is started and a place where cutting is finished on the work at different positions,
The method for producing a machined optical film according to claim 1 . At the end of cutting, separating the end mill from the work while running the end mill in an oblique direction with respect to the work in plan view;
3. The method for producing a machined optical film according to claim 1 or 2.

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