WO2013094732A1

WO2013094732A1 - Optical film cutting device, method for cutting optical film and recording medium

Info

Publication number: WO2013094732A1
Application number: PCT/JP2012/083242
Authority: WO
Inventors: 力也松本; 伸彦西原; 伸及川; 村松　俊彦
Original assignee: 住友化学株式会社
Priority date: 2011-12-22
Filing date: 2012-12-21
Publication date: 2013-06-27
Also published as: CN103998958A; KR20140119017A; TW201338945A; CN103998958B; JP2013130783A; KR102020692B1; JP5963073B2; TWI574805B

Abstract

An optical film cutting device is provided with: a transfer unit for transferring a belt-like optical film from a first position to a second position; an imaging unit for imaging a third position on the transfer track for the optical film; a control unit which transfers the optical film with the transfer unit by a first transfer amount from the first position toward the second position, images the optical film with the imaging unit, calculates a second transfer amount on the basis of the second position and the position of the optical film imaged by the imaging unit, and further transfers the optical film toward the second position with the transfer unit by the second transfer amount; and a first cutting unit for cutting the optical film transferred by the transfer unit by the first and second transfer amounts at a fourth position on the transfer track.

Description

Optical film cutting apparatus, optical film cutting method and recording medium

The present invention relates to an optical film cutting device, an optical film cutting method, and a recording medium.
This application claims priority on December 22, 2011 based on Japanese Patent Application No. 2011-281301 for which it applied to Japan, and uses the content here.

Conventionally, optical films such as polarizing films and retardation films to be attached to substrates such as liquid crystal panels are known. This optical film is obtained by cutting a strip-shaped optical film into a predetermined length.

For example, in Patent Document 1, an optical film is unwound and conveyed from an original fabric roll in which a band-shaped optical film is accumulated in a roll shape, and the optical film is cut into a predetermined length on the downstream side of the conveyance path, thereby Manufactures optical films.

International Publication No. 2010/021026 Pamphlet

In the optical film cutting technique described in Patent Document 1, the transport path of the optical film is composed of a plurality of transport rollers. And an optical film is conveyed by driving the feed roller with which each of a some conveyance roller is provided. On the downstream side of the conveyance path, the optical film is conveyed by a certain amount by the feed roller, temporarily stopped, cut, and then conveyed again. Thus, in patent document 1, the operation | movement of intermittent conveyance and a cutting | disconnection of an optical film is repeated.

By the way, in the situation where the optical film is conveyed, there may be a slip between the feed roller and the optical film. In such a case, the feeding amount of the optical film may be insufficient, and variations may occur. For this reason, there arises a problem that the length of the cut optical film after the cutting varies.

The present invention has been made in view of the above circumstances, and its main technical problem is that it is possible to suppress variations in the feed amount of the optical film, and to reduce variations in the length of the single-sheet optical film obtained after cutting. An optical film cutting device, an optical film cutting method, and a recording medium that can be used.

According to a first aspect of the present invention, there is provided a conveyance unit that conveys a belt-shaped optical film from a first position to a second position, an imaging unit that images a third position on a conveyance path of the optical film, From the first position toward the second position, the optical film is transported by the transport unit by the primary feed amount, the optical film is imaged by the image capturing unit, the second position, A secondary feed amount is calculated based on the position of the optical film captured by the imaging unit, and the optical film is further transported by the transport unit by the secondary feed amount toward the second position. An optical film comprising: a control unit; and a first cutting unit that cuts the optical film transported by the transport unit by the primary feed amount and the secondary feed amount at a fourth position on the transport path. Cutting device.

In the first aspect of the present invention, the third position may be between the first position and the second position.

In the first aspect of the present invention, the fourth position may be controlled to coincide with the second position.

In the first aspect of the present invention, the distance between the second position and the third position may be 1 mm to 5 mm.

In the first aspect of the present invention, the primary feed amount may be a distance between the first position and the third position.

In the first aspect of the present invention, the secondary feed amount may be a distance between the second position and the position of the optical film imaged by the imaging unit.

1st aspect of this invention WHEREIN: The said control part may use the front-end | tip of the said optical film in the conveyance direction by the said conveyance part of the said optical film as a position of the said optical film.

In the first aspect of the present invention, the first cutting unit may cut the optical film using a laser.

1st aspect of this invention WHEREIN: You may further provide the 2nd cutting part which cut | disconnects the said optical film conveyed only the said primary feed amount and the said secondary feed amount by the said conveyance part in a 5th position. .

In the first aspect of the present invention, the fifth position may be between the first position and the third position.

In the first aspect of the present invention, the control unit may cause the first cutting unit and the second cutting unit to simultaneously cut the optical film.

In the first aspect of the present invention, the control unit may cause the imaging unit to capture an image of the optical film after the transport unit transports the optical film by the primary feed amount and the secondary feed amount. .

In the first aspect of the present invention, the control unit has a distance between the second position and the position of the optical film that is transported by the primary feed amount and the secondary feed amount imaged by the imaging unit, When it exceeds the threshold value, the optical film may not be cut by the first cutting portion.

According to a second aspect of the present invention, the optical film is transported by a primary feed amount from the first position toward the second position, the optical film transported by the primary feed amount is imaged, 2 to calculate the secondary feed amount based on the position of the imaged optical film, further transport the optical film by the secondary feed amount toward the second position, In the optical film cutting method, the optical film transported by the primary feed amount and the secondary feed amount is cut at a fourth position on the transport path.

According to a third aspect of the present invention, the optical film is transported by a primary feed amount from the first position toward the second position, the optical film transported by the primary feed amount is imaged, 2 to calculate the secondary feed amount based on the position of the imaged optical film, further transport the optical film by the secondary feed amount toward the second position, A computer-readable recording medium recording a program for cutting the optical film transported by the primary feed amount and the secondary feed amount at a fourth position on the transport path.

According to the present invention, the optical film cutting apparatus, the optical film cutting method, and the recording that can suppress the variation in the feeding amount of the optical film and can reduce the variation in the length of the optical film of the single wafer obtained after cutting. A medium is provided.

It is a side surface schematic diagram which shows the cutting device of the optical film which concerns on embodiment of this invention. It is a side surface schematic diagram which shows the cutting part of the cutting device which concerns on embodiment of this invention. It is a figure which shows a mode that a strip | belt-shaped optical film is cut | disconnected by the cutting device which concerns on embodiment of this invention. It is a top view which shows the front-end | tip positioning part imaged with the imaging means of the cutting device which concerns on embodiment of this invention. It is a graph which shows the average length data of the sheet | seat optical film obtained by cut | disconnecting a strip | belt-shaped optical film by using the cutting device which concerns on embodiment of this invention. It is a graph which shows the average length data of the optical film of the sheet | seat obtained by cut | disconnecting a strip | belt-shaped optical film by using the cutting device by a prior art.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited to this embodiment. In all the following drawings, the dimensions and ratios of the respective components are appropriately changed in order to clarify the present embodiment. In the following description and drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted.

[1] Configuration of Cutting Device FIG. 1 is a schematic side view showing an optical film cutting device 1 according to an embodiment of the present invention. The cutting device 1 cuts an optical film F such as a polarizing film or a retardation film attached to a substrate of an optical display panel such as a liquid crystal panel or an organic EL panel. The optical film F is not particularly limited as long as it is a strip-like functional film having flexibility.

As shown in FIG. 1, the cutting device 1 continuously unwinds the strip-shaped optical film F from the original fabric roll 11 in the right direction in FIG. Then, the cutting device 1 cuts the optical film F into sheets having a predetermined length in the cutting area 12B disposed on the downstream side of the conveyance path 12, and carries it out to the carry-out area 12C.

The conveyance path 12 along which the optical film F is sent along the longitudinal direction is divided into a supply area 12A, a cutting area 12B, and a carry-out area 12C.
The supply area 12A supplies the optical film F from the raw roll 11 to the cutting area 12B. The cutting area 12B is an area following the supply area 12A.
In the cutting area 12B, the optical film F is intermittently conveyed, and the optical film F is cut when the conveyance is stopped. In addition, in the supply area 12A, the optical film F is continuously conveyed regardless of the intermittent conveyance of the optical film F in the cutting area 12B.

The raw fabric roll 11 is obtained by winding a belt-shaped optical film F around a bobbin 11a. The bobbin 11a is rotationally driven in the clockwise direction in FIG. As a result, the optical film F is continuously unwound around the supply area 12A of the conveyance path 12. The supply area 12A includes a plurality of guide rollers 21 and nip rollers 22 connected to each other. A nip roller (also referred to as a conveying means or a feed roller) 22A disposed at the rearmost end of the supply area 12A rotates as indicated by an arrow. Thereby, the optical film F is sent to the cutting area 12B.

A dancer roller 23 is disposed in the supply area 12A. The dancer roller 23 is supported so as to be swingable in the vertical direction as shown by an arrow D in the figure. As the dancer roller 23 swings downward, the conveyance path 12 becomes longer. Even while the optical film F is stopped and cut in the cutting area 12B, the dancer roller 23 absorbs the feed amount of the optical film F so that the optical film F is continuously conveyed in the supply area 12A. .

The unloading area 12C from the cutting area 12B of the conveyance path 12 is set almost horizontally. As shown in FIG. 2, the cutting area 12 B has a first cutting portion 31, a second cutting portion 32, and a tip positioning from the upstream side to the downstream side in the transport direction of the optical film F (from the left side to the right side in FIG. 2). The parts 33 are arranged at equal intervals. These intervals are equal to the length of the sheet obtained after the optical film F is cut. That is, in the cutting device 1, as shown in FIG. 3, the optical film F is simultaneously cut at two locations of the first cutting portion 31 and the second cutting portion 32, and the single-wafer optical film F 1 is cut once. Cut out two pieces at a time and carry them out.

The 1st cutting part 31 and the 2nd cutting part 32 are the same structures. As shown in FIG. 2, the cutting

units

31 and 32 include a suction table 35 and a laser irradiation unit 36 (also referred to as a cutting unit), respectively.
The suction table 35 sucks and holds the optical film F disposed on the upper surface over the entire width. The laser irradiation unit 36 is disposed below the suction table 35. A slit 35a is formed at the center of the suction table 35 in the transport direction so as to extend perpendicular to the transport direction.

The suction table 35 sucks and holds the optical film F on the upper surface by a negative pressure action. The laser irradiation unit 36 irradiates the optical film F held on the suction table 35 through the slit 35 a with a laser beam L that satisfies predetermined conditions (wavelength, output, etc.) that can appropriately cut the optical film F. The laser irradiation unit 36 cuts the optical film F in the width direction orthogonal to the transport direction by scanning the laser beam L along the slit 35a. In order to scan the laser beam L to cut the optical film F, for example, the following method is used. That is, the laser irradiation unit 36 is moved along the slit 35a, or the laser irradiation unit 36 is swung so as to swing along the slit 35a to change the irradiation direction of the laser beam L.

A transport conveyor that carries the cut optical film F1 between the first cutting unit 31 and the second cutting unit 32 and between the second cutting unit 32 and the positioning unit 33 and transports it to the carry-out area 12C. 41 and 42 are arranged.

The front end positioning part 33 is a part provided to position the front end of the optical film F in the transport direction at a predetermined position. The tip positioning portion 33 includes a positioning plate 37 that holds the optical film F by adsorbing it on the upper surface by a negative pressure action, and a tension roller 38.

The positioning plate 37 is disposed immediately after the transport conveyor 42, and extends so as to cross perpendicularly to the transport direction of the optical film F indicated by an arrow as shown in FIG. A front end stop line 37 a (also referred to as a front end stop position) extending perpendicularly to the longitudinal direction of the positioning plate 37, that is, the transport direction of the optical film F, is set on the surface of the positioning plate 37. The stop line 37a is virtually set and is not drawn directly on the surface of the positioning plate 37. The position of the stop line 37a is stored in a storage unit (not shown) of the control means 60 shown in FIG.

The tension roller 38 rotates in the feeding direction while pressing the front end of the optical film F against the rear end of the conveyor 42 from above. Thereby, the tension roller 38 removes the slack of the optical film F on the transport conveyor 42.

The imaging means 51 is disposed above the positioning plate 37. The imaging unit 51 includes an imaging element such as a CCD element. The imaging means 51 is provided so that the surface of the lower positioning plate 37 and its vicinity can be imaged. That is, the imaging unit 51 images the front and rear ends of the front end stop line 37a and the front end stop line 37a in the transport direction.

As shown in FIG. 1, the carry-out area 12C includes a plurality (two in the illustrated example) of carry-out

conveyors

43 and 44 arranged in the transport direction. The single wafer optical film F 1 cut in the cutting area 12 B is accumulated in the carry-out conveyor 43.

The first cutting part 31, the second cutting part 32, and the tip positioning part 33 are arranged at equal intervals, and it has been described that these intervals are equal to the length of the sheet obtained after the optical film F is cut. However, strictly speaking, this length is set to a distance equal to the length of the sheet to be obtained after cutting, in which the first interval and the second interval are the same distance. Here, the 1st space | interval is a space | interval between each irradiation position to the optical film F of the laser beam L irradiated from the laser irradiation part 36 of the 1st cutting part 31 and the 2nd cutting part 32. FIG. The second interval is an interval between the irradiation position of the laser beam L irradiated from the laser irradiation unit 36 of the second cutting unit 32 to the optical film F and the tip stop line 37a.

The cutting device 1 of this embodiment has a control means 60 as shown in FIG. Imaging information from the imaging unit 51 is supplied to the cutting unit 60. In the cutting apparatus 1, the operation components of the supply area 12 A, the cutting area 12 B, and the carry-out area 12 C are comprehensively controlled by the control means 60 based on the imaging information of the imaging means 51. Hereinafter, the operation of the cutting device 1 controlled by the control means 60 will be described.

[2] Operation of Cutting Device The cutting method of the optical film F of the present embodiment includes a conveying step of feeding the belt-shaped optical film F until the tip position of the optical film F reaches a predetermined tip stop position, and the tip position is A cutting step of cutting the optical film F that has reached the tip stop position at a cutting portion that is set on the near side in the feeding direction of the optical film F from the tip stop position.

For example, in the supply area 12 A, the optical film F is continuously unwound from the raw roll 11. The optical film F is sent to the cutting area 12B by the feed roller 22A. In the cutting area 12B ahead of the feed roller 22A, intermittent conveyance is performed in which the cutting operation and the conveyance operation of the optical film F are alternately performed. That is, the optical film F is fed and stopped by the feed roller 22 A until the tip reaches the tip positioning portion 33, and the optical film F is simultaneously cut by the first cutting portion 31 and the second cutting portion 32. Then, the two sheets of optical film F1 obtained by cutting are sent to the carry-out area 12C by the

conveyors

41 and 42. In conjunction with the feeding operation, the feed roller 22A resumes rotation, and the optical film F is fed to the cutting area 12B. The driving of the feed roller 22A and the

transport conveyors

41 and 42 are interlocked, and the feeding operation of the optical film F by the feed roller 22A and the transporting operation of the single-sheet optical film F1 by the

transport conveyors

41 and 42 are performed at the same timing. Done.

On the other hand, in the supply area 12A, the optical film F is continuously conveyed regardless of the intermittent conveyance of the optical film F in the cutting area 12B. When the transport of the optical film F is stopped in the cutting area 12B, the dancer roller 23 swings downward to lengthen the transport path 12, and the feed amount of the optical film F is absorbed and the continuous transport is maintained.

Next, details of intermittent conveyance in the cutting area 12B will be described.
As described above, the optical film F is simultaneously cut by the first cutting part 31 and the second cutting part 32, and when the two sheets of optical film F1 obtained by the cutting are sent to the carry-out area 12C, in parallel therewith. Then, the feed roller 22A resumes rotation, and the optical film F is primarily fed to the tip positioning portion 33 with a primary feed amount (primary feed step).

As shown in FIG. 4, the primary feed amount referred to here means that the tip position of the optical film F (the edge cut by the first cutting portion 31) is the front side, that is, the upstream side by a certain distance G from the tip stop line 37 a. This is the feed amount that is assumed to reach the primary feed arrival point 37b that is spaced apart from each other. The feed roller 22A is controlled to rotate by the primary feed amount. The distance G from the tip stop line 37a to the primary feed arrival point 37b on the near side is arbitrary, but for example, the distance G is preferably 1 mm to 5 mm, and more preferably 2 mm to 4 mm. In the present embodiment, the distance G is 3 mm.

Next, the tension roller 38 rotates and the optical film F on the

transport conveyors

41 and 42 is pulled in the transport direction, and the slack of the optical film F is removed. Subsequently, the leading end portion of the optical film F is adsorbed to the positioning plate 37 and the floating and slack are removed.

Next, in the tip positioning part 33, the tip position of the optical film F is imaged by the imaging means 51, and the tip position is detected (tip position detection step). Then, the tip position of the optical film F and the tip stop line 37a are compared based on the image pickup by the image pickup means 51, and the secondary feed amount required for the tip of the optical film F to reach the tip stop line 37a is calculated. (Secondary feed amount calculating step).

The secondary feed amount is a free amount from the tip of the optical film F to the tip stop line 37a. If the primary feed is an appropriate amount, the free amount is equal to the distance G from the primary feed arrival point 37b to the tip stop line 37a corresponding to the rotation speed of the feed roller 22A. However, if slippage occurs between the feed roller 22A and the optical film F during the primary feed, the feed amount becomes insufficient, and the leading end of the optical film F after the primary feed is assumed to be the primary feed arrival point 37b. It is located on the near side. In that case, the vacant amount from the front end of the optical film F to the front end stop line 37a is longer than the assumed distance G (for example, 3 mm described above). Therefore, the control unit 60 calculates the actual vacant amount after the primary feed, that is, the necessary secondary feed amount based on the imaging by the imaging unit 51.

Next, the feed roller 22A is rotated by the number of rotations corresponding to the calculated secondary feed amount, and the optical film F is secondarily fed (secondary feed step). The secondary feed is controlled such that the tip of the optical film F matches the tip stop line 37a.

Next, the optical film F is sucked and held on the suction table 35 in the first cutting part 31 and the second cutting part 32. Then, the laser beam L is irradiated from the laser irradiation unit 36 of each cutting

unit

31 and 32 to the optical film F held on the suction table 35 through the slit 35 a, and the optical film F is divided into the first cutting unit 31 and the second cutting unit 32. Are simultaneously cut (cutting step). After the cutting, a single sheet of optical film F1 is placed on each of the

conveyors

41 and 42 one by one. Thereafter, the suction of the optical films F and F1 by the suction table 35 and the positioning plate 37 is released, and the two cut optical films F1 are sequentially sent to the carry-out

conveyors

43 and 44 by the

transport conveyors

41 and 42.

The above is one cycle of the control operation by the control means 60. After the cutting of the optical film F, the feed roller 22A is rotated again in conjunction with the conveying operation of the single-sheet optical film F1, and the optical film F is sent from the supply area 12A to the cutting area 12B. Then, the above-described cycle is repeated, and the single-wafer optical film F1 is sequentially accumulated on the carry-out conveyor 44 in the carry-out area 12C, and is transferred to the next step.

[3] Effects of this embodiment When the optical film F is intermittently fed to the cutting area 12B by the feed roller 22A, the following problems occur when the conventional method is applied to the cutting apparatus 1. In the conventional method, the optical film F is transported once such that the feed roller 22A is rotated until the leading edge of the optical film F reaches the leading edge stop line 37a of the positioning plate 37. However, in such a one-time conveyance, when a slip occurs between the feed roller 22A and the optical film F, a shortage occurs in the feed amount, resulting in a problem that the length variation of the cut sheet becomes large.

In that respect, according to the present embodiment, the conveyance of the optical film F in the cutting area 12B is a primary feed for sending the optical film F until the tip reaches the primary feed arrival point 37b slightly from the tip stop line 37a. In the second stage of the secondary feed, the leading end finally reaches the leading end stop line 37a. After the primary feed, the vacant amount between the tip and the tip stop line 37a is obtained, and in the secondary feed, the optical film F is conveyed by this vacant amount, and the tip is corrected so as to match the tip stop line 37a. . For this reason, the variation in the feed amount of the optical film F by the feed roller 22A is suppressed, and a state where the tip of the optical film F is stopped at the tip stop line 37a with high accuracy can always be obtained. As a result, it is possible to reduce the length variation of the single-wafer optical film F1 obtained after cutting.

FIG. 5A shows an average value of the feed amount of the optical film F by the feed roller 22A when the optical film F is cut while transporting the optical film F by applying the method of the present embodiment, according to the number of samples. It is a graph. On the other hand, FIG. 5B is a graph in which the average value of the amount of optical film F fed by the feed roller 22A when the conventional method is adopted is collected according to the number of samples. As apparent from FIGS. 5A and 5B, it can be seen that by adopting the method of the present embodiment, it is possible to reduce the variation in the feeding amount of the optical film F as compared with the conventional method.

In this embodiment, the primary feed arrival point 37b in the primary feed is set on the near side in the feed direction of the optical film F with respect to the tip stop line 37a. For this reason, almost all the leading end positions of the optical film F after the primary feeding are positioned in front of the leading end stop line 37a. Therefore, the secondary feed direction is not reverse feed, and the feed roller 22A always rotates in the same direction. The control for rotating the feed roller 22A in the reverse direction to align the tip of the optical film F with the tip stop line 37a may be difficult to perform with high accuracy. Therefore, setting the primary feed arrival point 37b in the primary feed to the front side of the tip stop line 37a is effective for making the total feed amount constant.

In this embodiment, the cutting means is configured by the laser irradiation unit. However, the cutting means is not limited to this, and cutting means such as a cutter may be used.

In this embodiment, after the secondary feeding, the optical film F is cut. However, before the cutting after the secondary feeding, the imaging by the imaging means 51 is confirmed once again, and when the leading edge of the optical film F exceeds a preset threshold range with respect to the leading edge stop line 37a. Further, a step of discarding the single-wafer optical film without cutting the optical film F by the cutting means may be added.

INDUSTRIAL APPLICABILITY The present invention can be applied to an optical film cutting apparatus, an optical film cutting method, a recording medium, and the like that suppress variations in the optical film feed amount and reduce variations in the length of a single wafer optical film obtained after cutting. .

1 cutting device,
12 Transport path,
22A feed roller (conveying means),
31 1st cutting part,
32 second cutting part,
36 Laser irradiation part (cutting means),
37a Tip stop line (tip stop position),
37b Primary feed reaching point,
51 imaging means,
60 control means,
F optical film,
F1 single wafer optical film

Claims

A transport unit for transporting the belt-shaped optical film from the first position to the second position;
An imaging unit for imaging a third position on the transport path of the optical film;
From the first position toward the second position, the optical film is transported by the transport unit by a primary feed amount, and the optical film is imaged by the imaging unit,
Calculating a secondary feed amount based on the second position and the position of the optical film imaged by the imaging unit;
A controller that further transports the optical film by the transport unit by the secondary feed amount toward the second position;
A first cutting unit that cuts the optical film transported by the transport unit by the primary feed amount and the secondary feed amount at a fourth position on the transport path;
An optical film cutting apparatus comprising:
The optical film cutting device according to claim 1, wherein the third position is between the first position and the second position.
The optical film cutting device according to claim 1, wherein the fourth position is controlled so as to coincide with the second position.
The optical film cutting device according to claim 1, wherein a distance between the second position and the third position is 1 mm to 5 mm.
The optical film cutting device according to claim 1, wherein the primary feed amount is a distance between the first position and the third position.
The optical film cutting device according to claim 1, wherein the secondary feed amount is a distance between the second position and the position of the optical film imaged by the imaging unit.
The controller is
The optical film cutting device according to claim 1, wherein a tip of the optical film in a transport direction by the transport unit of the optical film is used as a position of the optical film.
The optical film cutting device according to claim 1, wherein the first cutting unit cuts the optical film using a laser.
The optical film cutting device according to claim 1, further comprising a second cutting unit that cuts the optical film conveyed by the conveying unit by the primary feeding amount and the secondary feeding amount at a fifth position.
The optical film cutting device according to claim 1, wherein the fifth position is between the first position and the third position.
The controller is
The optical film cutting device according to claim 10, wherein the optical film is simultaneously cut by the first cutting unit and the second cutting unit.
The controller is
The optical film cutting device according to claim 11, wherein after the transport unit transports the optical film by the primary feed amount and the secondary feed amount, the optical film is imaged by the imaging unit.
The controller is
When the distance between the second position and the position of the optical film conveyed by the primary feed amount and secondary feed amount imaged by the imaging unit exceeds a threshold value, the optical film The optical film cutting device according to claim 1, wherein the first film is not cut by the first cutting portion.
From the first position toward the second position, the optical film is transported by the primary feed amount, and the optical film transported by the primary feed amount is imaged,
A secondary feed amount is calculated based on the second position and the position of the imaged optical film,
The optical film is further conveyed by the secondary feed amount toward the second position,
An optical film cutting method of cutting the optical film transported by the primary feed amount and the secondary feed amount at a fourth position on the transport path.
From the first position toward the second position, the optical film is transported by the primary feed amount, and the optical film transported by the primary feed amount is imaged,
A secondary feed amount is calculated based on the second position and the position of the imaged optical film,
The optical film is further conveyed by the secondary feed amount toward the second position,
A computer-readable recording medium recording a program for cutting the optical film transported by the primary feed amount and the secondary feed amount at a fourth position on the transport path.