JP2016083770A - Cutting method and cutting device, manufacturing method for optical member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting method and a cutting device which can satisfy a severe dimensional requirement of an object.SOLUTION: In a cutting method of cutting an end surface of an object, a cutting member having a rotation shaft, and a cutting blade projecting to an end surface side of the object is prepared. Batches of cutting processing of cutting the end surface of the object by rotating the cutting blade around the rotation shaft and contacting the rotating cutting blade on the end surface of the object are conducted at a predetermined number of times. Then, a predetermined parameter indicating an overheat state of the cutting member is measured. A relative position of the end surface of the object to be cut in a next batch and the cutting blade is adjusted before the cutting processing in the next batch so that an external dimension of the object obtained by the cutting processing in the next batch does not exceed a required allowable range.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutting method, a cutting device, and a method for manufacturing an optical member.

  Conventionally, the cutting method of patent document 1 is known as a cutting method which cuts the end surface of a target object. The cutting method disclosed in Patent Document 1 cuts the end face of an optical member such as a polarizing plate. When the cutting region formed by a rotating cutting blade is brought into contact with the end face of the optical member, the cutting process is performed. In the cutting region, a part away from a predetermined imaginary line is brought into contact with the end face of the optical member. According to this method, the pressing action by the cutting blade is alleviated, and the end face of the optical member can be finished in a good state.

Japanese Patent No. 4954662

By the way, conventionally, the allowable range of the product standard is wide. For example, the tolerance of the outer dimension of the polarizing plate is ± 0.15 mm. Therefore, the change width of the outer dimension of the polarizing plate at the time of cutting the end face of the polarizing plate is within the allowable range of the product standard, and a polarizing plate satisfying the required dimension can be obtained.
However, in recent years, along with the narrowing of the frame of the liquid crystal display device, the demand for the change width of the outer dimension of the polarizing plate has become stricter. And it is +0.05 mm or less. Therefore, if the end face of the polarizing plate is simply cut by the conventional method as described in Patent Document 1, the change width of the outer dimension of the polarizing plate exceeds the allowable range of the product standard, which is severe in recent years. It is difficult to satisfy the required dimensions.

  According to the knowledge of the present inventor, a phenomenon has been confirmed in which the outer dimension of the optical member gradually decreases when the cutting member is used for a predetermined time in the cutting of the end face of the optical member. As a result of earnest research, the inventor of the present application has found that one of the causes is the thermal expansion of the rotating shaft caused by the rotational drive of the rotating shaft and the friction between the rotating shaft and the bearing, and the present invention has been achieved. .

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the cutting method and cutting device which can satisfy the exact | strict required dimension of a target object.

In order to achieve the above object, the present invention employs the following means.
(1) The cutting method according to the first aspect of the present invention is a cutting method for cutting an end face of an object, and includes a rotating shaft and a cutting blade protruding toward the end face of the object. A cutting member is prepared, the cutting blade is rotated about the rotation axis, and the rotating cutting blade is brought into contact with the end surface of the object to cut the end surface of the object, and a predetermined number of cutting processes are performed. After a batch is completed, a predetermined parameter indicating an overheated state of the cutting member is measured, and before starting the cutting process of the next batch, the end surface of the object to be cut in the next batch and the cutting blade The relative position is adjusted based on the predetermined parameter.

(2) In the cutting method described in the above (1), in the next batch, the outer dimension of the object obtained by the cutting processing of the next batch is not the outer dimension exceeding the required allowable range. The relative position between the end face of the object to be cut and the cutting blade may be adjusted. (3) In the cutting method according to (1) or (2), the amount of thermal expansion of the rotating shaft after cutting may be measured as the predetermined parameter.

(4) In the cutting method according to (1) or (2), the temperature around the rotating shaft after cutting is measured as the predetermined parameter, and the rotating shaft corresponding to the measured temperature is measured The adjustment may be performed based on the thermal expansion amount data.

(5) In the cutting method according to (4), the rotating shaft is rotatably supported by a bearing, and both the rotating shaft and the bearing are covered with a cover. The cover can conduct heat through the bearing, and the temperature of the cover may be measured as the temperature around the rotating shaft.

(6) The cutting method according to the second aspect of the present invention is a cutting method for cutting an end surface of an object, and includes a rotating shaft and a cutting blade protruding toward the end surface of the object. A cutting method of preparing a cutting member, rotating the cutting blade about the rotation axis, and cutting the end surface of the object by contacting the rotating cutting blade with the end surface of the object, The rotating shaft is cooled so that the rotating shaft does not thermally expand.

(7) In the cutting method described in (6) above, the rotating shaft is cooled so that the rotating shaft does not thermally expand so that the outer dimension of the object does not exceed the required allowable range. Good.
(8) In the cutting method according to (6) or (7), the rotating shaft is rotatably supported by a bearing, and both the rotating shaft and the bearing are covered with a cover, The rotating shaft and the cover can conduct heat through the bearing, and the cooling may be performed by external cooling of the cover with a coolant.

(9) In the cutting method according to the above (6) or (7), the rotary shaft is rotatably supported by a bearing, and both the rotary shaft and the bearing are covered with a cover, The rotating shaft and the cover can conduct heat through the bearing, and the cooling may be performed by blowing cooling air to the cover with an air cooling unit.

(10) A cutting method according to a third aspect of the present invention is a cutting method for cutting an end face of an object, and includes a rotating shaft and a cutting blade protruding toward the end face of the object. A cutting method of preparing a cutting member, rotating the cutting blade about the rotation axis, and cutting the end surface of the object by contacting the rotating cutting blade with the end surface of the object, The rotary shaft is preheated until it reaches a saturated state where no further thermal expansion of the rotary shaft occurs.

(11) In the cutting method according to (10) above, a saturated state in which the thermal expansion of the rotating shaft does not occur any more so that the outer dimension of the object does not exceed the required allowable range. It is good to heat the said rotating shaft beforehand until it becomes.
(12) In the cutting method according to the above (10) or (11), the heating may be performed by idling the rotating shaft before performing the cutting processing of the object.

(13) A cutting device according to a first aspect of the present invention is a cutting device that cuts an end surface of an object, and includes a rotating shaft and a cutting blade that protrudes toward the end surface of the object. A processing device that includes a cutting member, rotates the cutting blade about the rotation axis, and contacts the rotating cutting blade with the end surface of the object, and a predetermined number of times of cutting After the processing batch is completed, based on a predetermined parameter indicating the overheating state of the cutting member, before starting the cutting processing of the next batch, the end surface of the object to be processed by the next batch and the cutting blade And a control device that performs control to adjust the relative position between the first and second positions.

(14) In the cutting device according to (13), the control device may prevent the outer dimension of the object obtained by the cutting process of the next batch from exceeding a required allowable range. The relative position between the end face and the cutting blade may be adjusted.
(15) The cutting apparatus according to (13) or (14) may further include a dimension sensor that measures a thermal expansion amount of the rotating shaft after cutting as the predetermined parameter.

(16) In the cutting apparatus according to (13) or (14), the control apparatus further includes a temperature sensor that measures a temperature around the rotating shaft after the cutting as the predetermined parameter. The adjustment may be performed based on the data of the thermal expansion amount of the rotating shaft corresponding to the measurement result of the temperature sensor.

(17) The cutting apparatus according to (16), further including a bearing that rotatably supports the rotating shaft, and a cover that covers both the rotating shaft and the bearing, and the rotating shaft and the cover Is capable of conducting heat through the bearing, and the temperature sensor may measure the temperature of the cover as the temperature around the rotating shaft.

(18) A cutting device according to a second aspect of the present invention is a cutting device that cuts an end surface of an object, and includes a rotating shaft and a cutting blade that protrudes toward the end surface of the object. A processing device that includes a cutting member, rotates the cutting blade about the rotation axis, and contacts the rotating cutting blade with the end surface of the object; And a control device that controls to cool the rotating shaft so as not to thermally expand.

(19) In the cutting apparatus according to (18), the rotating shaft is cooled so that the rotating shaft does not thermally expand so that the outer dimension of the object does not exceed the required allowable range. It is good to perform control to do.
(20) In the cutting apparatus according to (18) or (19), a bearing that rotatably supports the rotating shaft, a cover that covers both the rotating shaft and the bearing, and a coolant that covers the cover. A cooling unit capable of external cooling, wherein the rotating shaft and the cover can conduct heat through the bearing, and the control device controls the cooling unit to perform external cooling of the cover May be performed.

(21) In the cutting apparatus according to (18) or (19), a bearing that rotatably supports the rotating shaft, a cover that covers both the rotating shaft and the bearing, and cooling air that is applied to the cover. An air cooling unit that can be sprayed, wherein the rotary shaft and the cover can conduct heat through the bearing, and the control device controls the air cooling unit that blows cooling air onto the cover. Also good.

(22) A cutting device according to a third aspect of the present invention is a cutting device that cuts an end surface of an object, and includes a rotating shaft and a cutting blade protruding toward the end surface of the object. A processing device that includes a cutting member, rotates the cutting blade about the rotation axis, and contacts the rotating cutting blade with the end surface of the object; And a control device that performs control to preheat the rotating shaft until a saturated state where thermal expansion does not occur any more is included.

(23) In the cutting apparatus according to (22) above, the control device may cause thermal expansion of the rotating shaft so that the outer dimension of the object does not exceed the control range defined by a product standard. It is good to perform control to preheat the rotating shaft until a saturated state where no more occurs.
(24) In the cutting device according to (22) or (23), the control device may perform control to idle the rotating shaft before performing the cutting processing of the object as the heating. Good.

  ADVANTAGE OF THE INVENTION According to this invention, the cutting method and cutting device which can satisfy the exact | strict requirement dimension of a target object can be provided.

It is a perspective view showing the cutting device concerning a 1st embodiment. It is a side view of a cutting member. It is a schematic diagram which shows the arrangement | positioning relationship of a rotating shaft, a bearing, and a cover. It is a perspective view which shows the cutting apparatus before attaching a rotary body. It is a perspective view which shows the cutting apparatus after attaching a rotary body. It is a figure for demonstrating the cutting method which concerns on 1st Embodiment. It is a figure which shows the relationship between the number of batches, and the deviation | shift amount from the reference value of the external dimension of a laminated body. It is a perspective view which shows a dimension sensor. It is a schematic diagram which shows the arrangement | positioning relationship of a dimension sensor and a cutting member. It is a figure which shows the change of the external dimension of the laminated body which concerns on a comparative example. It is a figure which shows the change of the external dimension of the laminated body in the long side direction of the optical member which concerns on 1st Embodiment. It is a figure which shows the change of the external dimension of the laminated body in the short side direction of the optical member which concerns on 1st Embodiment. It is a perspective view which shows a temperature sensor. It is a figure for demonstrating the production method of the thermal expansion table which shows the relationship between the temperature of a cover, and the thermal expansion amount of a rotating shaft. It is a figure which shows the change of the external dimension of the laminated body in the long side direction of the optical member which concerns on 2nd Embodiment. It is a figure which shows the change of the external dimension of the laminated body in the short side direction of the optical member which concerns on 2nd Embodiment. It is a perspective view which shows a cooling member. It is a perspective view which shows a blower.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

  In all the drawings below, the dimensions and ratios of the respective constituent elements are appropriately changed in order to make the drawings easy to see. In the following description and drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted.

(First embodiment)
FIG. 1 is a perspective view showing a cutting apparatus 1 used in the cutting method according to the first embodiment of the present invention.

  The cutting apparatus 1 is for cutting an end face of an object. In this embodiment, the end surface Wa of the rectangular parallelepiped laminated body W in which a plurality of optical members F are overlapped is set as an object to be cut. Thereby, the end surfaces of the plurality of optical members F are cut together. For example, the laminated body W is obtained by punching a long monolayer sheet or a raw sheet of a laminated sheet into a rectangular shape. Note that the object to be cut is not limited to the laminated body W, but may be a single optical member F. Moreover, as a target object, various members other than the laminated body W can be set as cutting targets.

  Examples of the sheet constituting the laminate W include, but are not particularly limited to, a polyvinyl alcohol film, a cellulose film typified by a triacetyl cellulose film, and an ethylene-vinyl acetate film. Since the polarizing plate composed of a plurality of optical films is thick, it is preferable as a cutting target of the cutting apparatus 1 of the present invention capable of processing a large amount of end faces.

  As shown in FIG. 1, the cutting device 1 includes a processing device (for example, the first processing device 2 and the second processing device 3 in the present embodiment), a moving device 4, a first position adjusting device 5, and a second device. A position adjusting device 6 and a control device 7 are provided.

  The first processing device 2 and the second processing device 3 are arranged to face each other with the moving device 4 interposed therebetween. A cutting member 20 that cuts the end surface Wa of the stacked body W is disposed on the side of the moving device 4 in each of the first processing device 2 and the second processing device 3. By rotating the cutting members 20 of both the first processing device 2 and the second processing device 3, two end surfaces Wa of the four end surfaces Wa of the stacked body W can be simultaneously cut.

Hereinafter, the configuration of the cutting member 20 will be described.
FIG. 2 is a side view of the cutting member 20.

  As shown in FIG. 2, the cutting member 20 includes a rotating shaft 21 extending along the normal direction of the end surface Wa (see FIG. 1) of the stacked body W, and a rotating body 22 that rotates about the rotating shaft 21. , A support base 23 that supports the rotating shaft 21, and a plurality of cutting blades provided on the rotating body 22 (for example, in the present embodiment, a first cutting blade 24a, a second cutting blade 24b, a third cutting blade 24c, a fourth cutting blade). 6 cutting blades of a blade 24d, a fifth cutting blade 24e, and a sixth cutting blade 24f). In the following description, the first cutting blade 24a, the second cutting blade 24b, the third cutting blade 24c, the fourth cutting blade 24d, the fifth cutting blade 24e, and the sixth cutting blade 24f are collectively referred to as “cutting blade 24”. May be called.

  The rotating body 22 is fixed to the rotating shaft 21 and rotates in one direction around the rotating shaft 21. The rotating body 22 has an installation surface 22 a that is perpendicular to the rotating shaft 21. In addition, although the rotary body 22 is a disk shape, it is not limited to the said shape.

  For example, the diameter of the rotating body 22 is about 250 mm. The diameter of the rotating body 22 is not limited to this, and can be set to 150 mm or more and 600 mm or less as an example.

  The cutting blade 24 is provided on the installation surface 22 a of the rotating body 22. The cutting blade 24 protrudes from the installation surface 22a toward the end surface Wa (see FIG. 1) of the stacked body W.

  The cutting blades 24a to 24c have a larger amount of protrusion from the installation surface 22a in this order. The first cutting blade 24a has the longest distance from the rotation shaft 21 and the smallest protrusion amount from the installation surface 22a, and the third cutting blade 24c has the shortest distance from the rotation shaft 21 and from the installation surface 22a. The amount of protrusion is the largest.

  The first cutting blade 24a, the second cutting blade 24b, the fourth cutting blade 24d, and the fifth cutting blade 24e are cutting blades for rough cutting, and are made of polycrystalline diamond. On the other hand, the third cutting blade 24c and the sixth cutting blade 24f are finishing cutting blades made of single crystal diamond. The material is selected as a preferable form as the material of the cutting blade, and is not limited to these as long as it is a material suitable for cutting the end surface Wa (see FIG. 1) of the laminated body W.

  In the present embodiment, the number of cutting blades is six. However, the number of cutting blades is not limited to this, and can be appropriately changed according to various conditions such as the distance from the rotary shaft 21 to the cutting blade. However, from the viewpoint of processing efficiency, it is preferable to increase the number of cutting blades as the distance from the rotary shaft 21 to the cutting blade is longer. Moreover, although arrangement | positioning of the cutting blade is not specifically limited, From a viewpoint of processing efficiency, it is preferable that several cutting blades are arrange | positioned at predetermined intervals from the rotating shaft 21 at equal distance.

  The shape of the cutting blade is not particularly limited, and may be a columnar shape, a prismatic shape, a columnar shape having a trapezoidal cross section, a hemispherical shape, or the like. The shape and size of the cutting blade can be appropriately set depending on the dimensions of the optical member, the required processing efficiency, and the like. Further, the cutting blade may be inclined with respect to the axial direction of the rotating shaft 21 as long as it is provided so as to protrude toward the end face Wa (see FIG. 1) of the laminated body W.

  FIG. 3 is a schematic diagram showing the positional relationship between the rotating shaft 21, the bearing 25, and the cover 26. In FIG. 3, illustration of the rotating body 22, the support base 23, and the cutting blade 24 that configure the cutting member 20 is omitted for the sake of convenience.

  As shown in FIG. 3, the cutting apparatus 1 (see FIG. 1) includes a bearing 25 that rotatably supports the rotating shaft 21, and a cover 26 that covers both the rotating shaft 21 and the bearing 25. The rotating shaft 21 and the cover 26 are configured to be able to conduct heat via a bearing 25. For example, the material of the rotating shaft 21 is chrome molybdenum steel, the material of the bearing is high carbon chrome steel, and the material of the cover 26 is ordinary cast iron.

FIG. 4 is a perspective view showing the cutting apparatus 1 before the rotating body 22 is attached.
FIG. 5 is a perspective view showing the cutting apparatus 1 after the rotating body 22 is attached.

  As shown in FIG. 4, before attaching the rotating body 22 (see FIG. 5), one end 21 a of the rotating shaft 21 protrudes from one end of the cover 26.

  As shown in FIG. 5, the rotating body 22 is attached to one end 21 a (see FIG. 4) of the rotating shaft 21 protruding from one end of the cover 26.

  Returning to FIG. 1, the moving device 4 includes a base 40, a portal frame 41 provided on the base 40, a disk-like table 42 provided on the base 40, and a table 42. The first pressing member 43 arranged, a cylinder 44 provided on the base 40 side of the frame 41, and a second pressing member 45 attached to the tip of the rod of the cylinder 44 are provided.

  The moving device 4 moves the laminated body W in the direction V parallel to the longitudinal direction of the end face Wa of the laminated body W with respect to the cutting member 20.

  The table 42 can rotate the first pressing member 43 around the central axis of the table 42. The cylinder 44 can move the second pressing member 45 up and down. The stacked body W is sandwiched and fixed between the first pressing member 43 and the second pressing member 45.

The base 40 is movable so as to pass between the first processing device 2 and the second processing device 3. In cutting, the laminated body W is fixed by the first pressing member 43 and the second pressing member 45. At this time, the normal direction of both end faces of the laminated body W and the extending direction of the rotating shaft 21 of each of the first processing device 2 and the second processing device 3 are matched. And the rotary body 22 is rotated and the base 40 is moved so that the laminated body W may pass between the 1st processing apparatus 2 and the 2nd processing apparatus 3. FIG. The base 40 is moved in a direction V parallel to the longitudinal direction of the end surface Wa of the stacked body W to be cut by a moving mechanism (not shown).
With the rotation of the rotating body 22, the cutting blade 24 provided on the installation surface 22 a of the rotating body 22 rotates and the cutting blade 24 comes into contact with the end surface Wa of the stacked body W, thereby cutting the end surface Wa.

  At this time, first, the first cutting blade 24a and the fourth cutting blade 24d located on the outermost side of the rotating body 22 are in contact with the stacked body W, and the end surface Wa is cut. As the base 40 advances, the second cutting blade 24b and the fifth cutting blade 24e provided on the inner side of the first cutting blade 24a and the fourth cutting blade 24d are in contact with the laminate W, and the end surface Wa is cut. To do. Since the 2nd cutting blade 24b and the 5th cutting blade 24e have a larger projection amount than the 1st cutting blade 24a and the 4th cutting blade 24d, end face Wa cut by the 1st cutting blade 24a and the 4th cutting blade 24d, Cut deeper. Thus, the 1st cutting blade 24a, the 2nd cutting blade 24b, the 4th cutting blade 24d, and the 5th cutting blade 24e cut the end surface Wa of the laminated body W gradually deeply. Finally, the third cutting blade 24c and the sixth cutting blade 24f for finishing cut the end surface Wa of the laminated body W and perform mirror finishing. After the processing of the pair of facing end faces Wa is completed in this way, the table 42 is rotated by 90 ° to process the other end faces Wa.

  The first position adjusting device 5 adjusts the position of the first processing device 2. Specifically, the first position adjusting device 5 moves the first processing device 2 only in the direction Vf parallel to the short direction of the optical member F constituting the stacked body W.

  The second position adjusting device 6 adjusts the position of the second processing device 3. Specifically, the second position adjusting device 6 moves the second processing device 3 only in the direction Vf.

  The control device 7 comprehensively controls the first position adjustment device 5 and the second position adjustment device 6. The control device 7 controls the first position adjusting device 5 and the second position adjusting device 6 to move each of the first processing device 2 and the second processing device 3 only in the direction Vf.

  Hereinafter, the cutting method according to the present embodiment will be described.

(Cutting method)
The cutting method according to the present embodiment is a cutting method for an end surface Wa (see FIG. 1) of a laminated body W in which a plurality of optical members F are stacked, and is performed using the cutting device 1 shown in FIG. Is called.

FIG. 6 is a diagram for explaining the cutting method according to the present embodiment.
FIG. 6 is a diagram illustrating cutting of the end surface Wa of the multilayer body W by the cutting member 20.

  As shown in FIG. 6, the cutting method according to the present embodiment is performed by moving the rotating body 22 in the direction V parallel to the longitudinal direction of the end surface Wa of the stacked body W while rotating the rotating body 22 clockwise. The end surface Wa is cut.

  The rotating direction of the rotating body 22 is not limited to the direction shown in FIG. 6 (clockwise), and the rotating body 22 is moved in the direction V parallel to the longitudinal direction of the end face of the laminated body W while rotating the rotating body 22 counterclockwise. Thus, the end surface Wa of the stacked body W may be cut.

By the way, conventionally, the allowable range of the product standard is wide. For example, the tolerance of the outer dimension of the polarizing plate is ± 0.15 mm. Therefore, the change width of the outer dimension of the polarizing plate at the time of cutting the end face of the polarizing plate is within the allowable range of the product standard, and a polarizing plate satisfying the required dimension can be obtained.
However, in recent years, along with the narrowing of the frame of the liquid crystal display device, the demand for the change width of the outer dimension of the polarizing plate has become stricter. And it is +0.05 mm or less. Therefore, if the end face of the polarizing plate is simply cut, the change width of the outer dimensions of the polarizing plate at the time of cutting exceeds the control range of the product standard, and it becomes difficult to satisfy recent severe demanded dimensions. ing.

  FIG. 7 is a diagram illustrating the relationship between the number of batches and the amount of deviation from the reference value of the outer dimensions of the laminated body W.

  Here, the number of batches means the number of times that the end surface Wa of the laminated body W has been subjected to the cutting process, and one batch means a process of cutting each of the four end faces Wa of one laminated body W once. . For example, when two end surfaces Wa of the four end surfaces Wa of the laminated body W are simultaneously cut at once, first, the two end surfaces Wa of the laminated body W in the longitudinal direction of the optical member F are cut, and then By rotating the table 42 by 90 ° and cutting the remaining two end faces Wa of the laminated body W in the short direction of the optical member F, one batch is completed.

  In FIG. 7, a change in the outer dimension of the laminated body W in the long side direction of the optical member F is indicated by a solid line, and a change in the outer dimension of the laminated body W in the short side direction of the optical member F is indicated by a broken line. In FIG. 7, the horizontal axis represents the number of batches [pieces]. The vertical axis represents the deviation [mm] from the reference value of the outer dimension of the laminate W.

  As shown in FIG. 7, when the end surface Wa of the laminated body W is cut by the conventional method, the outer dimensions of the laminated body W in each of the long side direction and the short side direction of the optical member F are increased as the number of batches is increased. The amount of deviation from the reference value increases. Therefore, if the number of batches is continuously increased as it is, the change width of the outer dimension of the polarizing plate at the time of cutting exceeds the management range of the product standard (for example, the outer dimension tolerance of the polarizing plate: ± 0.05 mm). In FIG. 7, it can be seen that from the number of batches of 22 or more, the change width of the outer dimension of the polarizing plate during the cutting process exceeds the outer dimension tolerance of the polarizing plate: ± 0.05 mm.

  According to the knowledge of the present inventor, in the cutting of the end face of the optical member F, it has been confirmed that when the rotating body 22 is rotated for a predetermined time, the external dimension of the optical member F gradually decreases. As a result of diligent research, the present inventor has found that one of the causes is the thermal expansion of the rotating shaft 21 due to the influence of the rotational drive of the rotating shaft 21 and the friction between the rotating shaft 21 and the bearing 25. It came to invent the cutting method of this.

  The cutting method according to the present embodiment is a cutting method for cutting the end surface Wa of the multilayer body W, and includes a rotating shaft 21 extending along the normal direction of the end surface Wa of the multilayer body W, and the multilayer body W. A cutting member 20 having a cutting blade 24 protruding toward the end surface Wa side of the substrate, rotating the cutting blade 24 about the rotation shaft 21, and bringing the rotating cutting blade 24 into contact with the end surface Wa of the laminate W. The batch of the cutting process for cutting the end surface Wa of the laminated body W is performed a predetermined number of times, and then the predetermined parameter indicating the overheating state of the cutting member 20 is measured, and before the next batch starts the cutting process, the next batch The relative position between the end surface Wa of the laminate W to be cut and processed by the cutting blade 24 is adjusted based on the predetermined parameter.

  The control device 7 according to the present embodiment uses the predetermined parameter indicating the overheated state of the cutting member 20 after the predetermined number of cutting processing batches are completed, and then the outer shape of the laminate W obtained by the cutting processing of the next batch. Before starting the cutting process of the next batch, the end surface Wa of the laminate W to be processed in the next batch and the cutting blade 24 so that the dimensions do not exceed the allowable range defined by the product standard. Control to adjust the relative position.

Here, the predetermined number of cutting processing batches is 1 or more, preferably 1 to 100 times, more preferably 1 to 50 times, and even more preferably 1 to 20 times. It is.
The predetermined parameter indicating the overheated state of the cutting member 20 is the heat of the rotary shaft 21 when the rotary shaft 21 is thermally expanded due to the rotational drive of the rotary shaft 21 or the influence of friction between the rotary shaft 21 and the bearing 25. It means a value indicating the amount of expansion.

  In this embodiment, the amount of thermal expansion of the rotating shaft 21 after cutting is measured as a predetermined parameter.

FIG. 8 is a perspective view showing the dimension sensor 30.
FIG. 9 is a schematic diagram showing the positional relationship between the dimension sensor 30 and the cutting member 20.
In FIG. 9, for the sake of convenience, the rotating shaft 21 and the support base 23 constituting the cutting member 20 are not shown, and the rotating body 22 and the cutting blade 24 are illustrated.

  As shown in FIG. 8, in this embodiment, the amount of thermal expansion of the rotating shaft 21 after cutting is measured using a dimension sensor 30. As the dimension sensor 30, for example, a non-contact type dimension measuring device can be used.

  As shown in FIG. 9, a hole 26 h that penetrates the cover 26 is formed in a part of the cover 26. The hole 26h is disposed so as to face the surface of the rotating body 22 opposite to the side on which the cutting blade 24 is provided (hereinafter, sometimes referred to as the back surface of the rotating body 22).

  The laser light emission surface 30a of the dimension sensor 30 is disposed at a position overlapping the hole 26h when viewed from the normal direction of the back surface of the rotating body 22. Laser light is emitted from the laser light emission surface 30 a toward the back surface of the rotating body 22. The dimension sensor 30 measures the return distance of the laser light between the laser light emitting surface 30 a and the back surface of the rotating body 22. Thereby, the thermal expansion amount of the rotating shaft 21 after cutting is measured as the displacement amount in the direction Vf of the rotating body 22.

  The control device 7 controls the first position adjusting device 5 and the second position adjusting device 6 based on the measurement result of the dimension sensor 30, and each of the first processing device 2 and the second processing device 3 is set in the direction Vf. Only move.

  In the cutting method according to the present embodiment, the displacement amount in the direction Vf of the rotating body 22 is measured by the dimension sensor 30 as the thermal expansion amount of the rotating shaft 21 after the cutting by the dimension sensor 30 after a predetermined number of cutting processing batches are completed. Before starting the next batch cutting process so that the outer dimension of the laminate W obtained by the next batch cutting process does not exceed the allowable range defined by the product standard, the controller 7 The relative position in the direction Vf between the end surface Wa of the laminated body W to be cut and processed in batch and the cutting blade 24 is adjusted.

Hereinafter, the relationship between the number of batches and the amount of deviation from the reference value of the outer dimensions of the laminate W will be described with reference to FIGS.
FIG. 10 is a diagram illustrating a change in the outer dimensions of the laminated body W in the long-side direction of the optical member F according to the comparative example.
FIG. 11 is a diagram illustrating a change in the outer dimension of the laminated body W in the long-side direction of the optical member F according to the present embodiment.
FIG. 12 is a diagram showing a change in the outer dimension of the laminated body W in the short side direction of the optical member F according to the present embodiment.
10 to 12, the horizontal axis represents the number of batches [times]. The vertical axis represents the deviation [mm] from the reference value of the outer dimension of the laminate W. “Maximum value” is the largest value among the deviation amounts in one batch, “Minimum value” is the smallest value among the deviation amounts in one batch, and “Average value” is one batch. It is a value obtained by averaging the variation of the deviation amount in the inside. In the comparative example, the relative position in the direction Vf between the end face Wa and the cutting blade 24 is not adjusted.

  In the comparative example, as shown in FIG. 10, when the end surface Wa of the laminated body W is cut, the amount of deviation from the reference value of the outer dimension of the laminated body W increases as the number of batches increases. Therefore, if the number of batches is continuously increased as it is, the change width of the outer dimension of the polarizing plate at the time of cutting exceeds the management range (for example: ± 0.05 mm) of the product standard. In FIG. 10, it can be seen that the change width of the outer dimensions of the polarizing plate during the cutting process exceeds the control range (for example, ± 0.05 mm) of the product standard when the number of batches is 4 times or more.

  On the other hand, in this embodiment, after a predetermined number of cutting process batches are completed, the displacement amount in the direction Vf of the rotating body 22 is measured as the thermal expansion amount of the rotating shaft 21 after the cutting process, and the next batch is cut. Before starting the next batch cutting process so that the outer dimension of the laminate W obtained by the processing does not exceed the control range (for example: ± 0.05 mm) defined by the product standard, the next batch The relative position in the direction Vf between the end surface Wa of the laminated body W to be cut and processed by the cutting blade 24 is adjusted.

  In FIG. 11, the laminated body W is moved in the long side direction of the optical member F by moving the set position of the cutting member 20 in a direction that cancels out the deviation amount for each cutting batch of the end surface Wa of the laminated body W. The amount of deviation from the reference value of the external dimension of the product is not exceeded the control range, and the required dimension is satisfied.

  In FIG. 12, the laminated body W is moved in the short side direction of the optical member F by moving the setting position of the cutting member 20 in a direction that cancels out the deviation amount for each cutting batch of the end surface Wa of the laminated body W. The amount of deviation from the reference value of the external dimension of the product is not exceeded the control range, and the required dimension is satisfied.

  As described above, according to the present embodiment, the optical member F that satisfies the required dimensions can be obtained by moving the set position of the cutting member 20 at a predetermined timing.

  Further, since the displacement amount in the direction Vf of the rotating body 22 is measured using the dimension sensor 30 as the thermal expansion amount of the rotating shaft 21 after the cutting process, the necessary movement amount of the cutting member 20 can be obtained with high accuracy. it can.

  In the present embodiment, the moving device 4 has been described by taking an example in which the stacked body W is moved in the direction V parallel to the longitudinal direction of the end surface Wa of the stacked body W with respect to the cutting member 20, but the present invention is not limited thereto. . The moving device may move the cutting member in a direction parallel to the longitudinal direction of the end face of the laminate relative to the end face of the laminate. That is, the moving device may be configured to move the cutting member relative to the end surface of the laminate in a direction parallel to the longitudinal direction of the end surface of the laminate.

(Second Embodiment)
Next, a cutting method according to the second embodiment will be described.
In this embodiment, the temperature around the rotating shaft 21 after cutting is measured as a predetermined parameter, and the cutting processing is performed in the next batch based on the data of the thermal expansion amount of the rotating shaft 21 corresponding to the measured temperature. The relative position between the end surface Wa of the laminated body W and the cutting blade 24 is adjusted.

FIG. 13 is a perspective view showing a temperature sensor 31 used in the cutting method of the present embodiment.
In FIG. 13, the same reference numerals are given to components common to the first embodiment, and detailed description thereof is omitted.

  As shown in FIG. 13, the temperature sensor 31 is a non-contact type temperature sensor and is disposed in the vicinity of the cover 26. The temperature sensor 31 measures the temperature of the cover 26 as the temperature around the rotating shaft 21 after the cutting process. Note that a contact-type temperature sensor may be used as the temperature sensor 31.

  As described above, the rotary shaft 21 and the cover 26 can conduct heat via the bearing 25 (see FIG. 3). For example, a temperature table indicating the relationship between the temperature of the cover 26 and the temperature of the rotary shaft 21 is set in advance, and the temperature of the cover 26 is measured by the temperature sensor 31 to indirectly measure the temperature of the rotary shaft 21. Can do.

  Moreover, the thermal expansion amount of the rotating shaft 21 after cutting is obtained by setting in advance a thermal expansion table showing the relationship between the temperature of the cover 26 and the thermal expansion amount of the rotating shaft 21. That is, by measuring the temperature of the cover 26 with the temperature sensor 31, the thermal expansion amount of the rotating shaft 21 after the cutting can be indirectly measured.

  FIG. 14 is a diagram for explaining a method of creating a thermal expansion table that shows the relationship between the temperature of the cover 26 and the thermal expansion amount of the rotating shaft 21.

  For example, as shown in FIG. 14, the method of creating the thermal expansion table sets the temperature of the cover 26 within a predetermined range, and the rotating body 22 as the thermal expansion amount of the rotating shaft 21 after cutting at the temperature in the range. It can be created by measuring the displacement L in the direction Vf. For example, the model “ID-C1012X” of a measuring instrument “Digimatic Indicator” manufactured by Mitutoyo Corporation can be used to measure the displacement L.

  The control device 7 controls the first position adjusting device 5 and the second position adjusting device 6 based on the data of the thermal expansion amount of the rotating shaft 21 corresponding to the measurement result of the temperature sensor 31, and the first processing device 2. And each of the 2nd processing apparatus 3 is moved only to the direction Vf.

  In the cutting method according to the present embodiment, the temperature of the cover 26 is measured as the temperature around the rotating shaft 21 after the cutting by the temperature sensor 31 after the predetermined number of cutting processing batches are completed. Based on the data of the displacement L in the direction Vf of the rotating body 22 as the thermal expansion amount of the corresponding rotating shaft 21, the management range in which the outer dimensions of the laminated body W obtained by the cutting processing of the next batch is determined by the product standard. Before starting the cutting process of the next batch, the relative position in the direction Vf between the end surface Wa of the laminated body W to be cut by the control batch 7 and the cutting blade 24 is determined before starting the cutting process of the next batch. adjust.

Hereinafter, the relationship between the number of batches and the amount of deviation from the reference value of the outer dimension of the laminate W will be described with reference to FIGS. 15 and 16.
FIG. 15 is a diagram showing a change in the outer dimension of the laminated body W in the long side direction of the optical member F according to the present embodiment.
FIG. 16 is a diagram illustrating a change in the outer dimension of the laminated body W in the short side direction of the optical member F according to the present embodiment.
15 and 16, the horizontal axis represents the number of batches [times]. The vertical axis represents the deviation [mm] from the reference value of the outer dimension of the laminate W. “Maximum value” is the largest value among the deviation amounts in one batch, “Minimum value” is the smallest value among the deviation amounts in one batch, and “Average value” is one batch. It is a value obtained by averaging the variation of the deviation amount in the inside.

  In the present embodiment, after a predetermined number of cutting processing batches are completed, the temperature of the cover 26 is measured as the temperature around the rotating shaft 21 after cutting, and the thermal expansion amount of the rotating shaft 21 corresponding to the measured temperature. Based on the data of the displacement L in the direction Vf of the rotating body 22, the outer dimension of the laminated body W obtained by the cutting process of the next batch exceeds the management range (for example: ± 0.05 mm) determined by the product standard. Before starting the cutting process of the next batch, the relative position in the direction Vf between the end surface Wa of the laminated body W to be cut and processed in the next batch and the cutting blade 24 is adjusted so that the outer dimensions are not reduced.

  In FIG. 15, the laminated body W is moved in the long side direction of the optical member F by moving the set position of the cutting member 20 in a direction that cancels out the deviation amount for each cutting batch of the end surface Wa of the laminated body W. The amount of deviation from the reference value of the external dimension of the product is not exceeded the control range, and the required dimension is satisfied.

  In FIG. 16, the laminated body W is moved in the short side direction of the optical member F by moving the setting position of the cutting member 20 in a direction that cancels out the deviation amount for each cutting batch of the end surface Wa of the laminated body W. The amount of deviation from the reference value of the external dimension of the product is not exceeded the control range, and the required dimension is satisfied.

  Also in this embodiment, the optical member F satisfying the required dimensions can be obtained by moving the set position of the cutting member 20 at a predetermined timing.

  Further, according to the present embodiment, the temperature of the cover 26 is measured using the temperature sensor 31 as the temperature around the rotating shaft 21 after the cutting, and the temperature is rotated as the thermal expansion amount of the rotating shaft 21 corresponding to the measured temperature. Since the displacement amount L in the direction Vf of the body 22 is obtained, the necessary movement amount of the cutting member 20 can be obtained with high accuracy.

(Third embodiment)
Subsequently, a cutting method according to the third embodiment will be described.
The cutting method according to the present embodiment is a cutting method for cutting the end surface Wa of the multilayer body W, and includes a rotating shaft 21 extending along the normal direction of the end surface Wa of the multilayer body W, and the multilayer body W. A cutting member 20 having a cutting blade 24 projecting toward the end surface Wa side, rotating the cutting blade about the rotating shaft 21, and bringing the rotating cutting blade 24 into contact with the end surface Wa of the laminate W This is a cutting method for cutting the end surface Wa of the laminated body W, and the rotating shaft 21 is cooled so that the rotating shaft 21 does not thermally expand.

  The control device 7 according to the present embodiment performs control for cooling the rotating shaft 21 so that the rotating shaft 21 does not thermally expand so that the outer dimension of the laminated body W does not exceed the allowable range determined by the product standard. Do.

  In the present embodiment, the cooling is performed by external cooling of the cover with a coolant. Specifically, the cooling is performed by winding a cooling member 32 that circulates a coolant around the cover 26.

  A cooling member 32 capable of circulating a coolant around the cover 26 is wound around the cover 26. The control device 7 performs control for circulating the coolant through the cooling member 32 as the cooling.

FIG. 17 is a perspective view showing the cooling member 32 used in the cutting method of the present embodiment.
In FIG. 17, the same reference numerals are given to components common to the first embodiment, and detailed description thereof is omitted.

An example of the coolant is cooling water.
As shown in FIG. 17, the cooling member 32 is disposed in contact with the cover 26. For example, the cooling member 32 is a hose that circulates cooling water.

  As described above, the rotary shaft 21 and the cover 26 can conduct heat via the bearing 25 (see FIG. 3). For example, a temperature table showing the relationship between the temperature of the cooling water and the temperature of the rotary shaft 21 is set in advance, and the temperature of the cooling water is set to a temperature at which the rotary shaft 21 does not excessively expand to cover the cooling member 32. By winding around the rotary shaft 26, the rotary shaft 21 can be indirectly cooled via the cover 26 and the bearing 25.

  According to the present embodiment, the cover 26 is cooled by the cooling member 32 so that the rotating shaft 21 does not thermally expand, and the rotating shaft 21 is indirectly cooled. Therefore, the optical member F that satisfies the required dimensions can be obtained. .

(Fourth embodiment)
Subsequently, a cutting method according to the fourth embodiment will be described.
In the third embodiment described above, the cooling is performed by winding the cooling member 32 that circulates the coolant around the cover 26.
On the other hand, in the present embodiment, the cooling is performed by blowing cooling air to the cover 26 with an air cooling unit (blower 33 in the embodiment).

  The cover 26 is provided with a blower 33 capable of blowing cooling air to the cover 26. As the cooling, the control device 7 controls the blower 33 to blow cooling air.

FIG. 18 is a perspective view showing the blower 33 used in the cutting method of the present embodiment.
In FIG. 18, components common to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 18, the cooling air outlet of the blower 33 is disposed to face the rotating shaft 21.

  As described above, the rotary shaft 21 and the cover 26 can conduct heat via the bearing 25 (see FIG. 3). For example, a temperature table showing the relationship between the temperature of the cooling air and the temperature of the rotating shaft 21 is set in advance, and the temperature of the cooling air is set to a temperature at which the rotating shaft 21 does not excessively expand, and the blower 33 is used. By blowing cooling air onto the cover 26, the rotating shaft 21 can be indirectly cooled.

  According to the present embodiment, the cover 26 is cooled by the cooling air from the blower 33 so that the rotating shaft 21 does not thermally expand, and the rotating shaft 21 is indirectly cooled, so that the optical member F that satisfies the required dimensions is obtained. Can do.

  In the third embodiment and the fourth embodiment described above, the cooling by the cooling member 32 and the cooling by the blower 33 are described as the cooling, but are not limited thereto. Moreover, although the example which cools the rotating shaft 21 indirectly was given and demonstrated as said cooling, you may cool the rotating shaft 21 directly.

  Further, as the cooling, the cooling by the cooling member 32 and the cooling by the blower 33 may be performed in combination.

(Fifth embodiment)
Subsequently, a cutting method according to the fifth embodiment will be described.
The cutting method according to the present embodiment is a cutting method for cutting the end surface Wa of the multilayer body W, and includes a rotating shaft 21 extending along the normal direction of the end surface Wa of the multilayer body W, and the multilayer body W. A cutting member 20 having a cutting blade 24 projecting toward the end surface Wa side, rotating the cutting blade about the rotating shaft 21, and bringing the rotating cutting blade 24 into contact with the end surface Wa of the laminate W In this cutting method, the end surface Wa of the laminated body W is cut, and the rotating shaft 21 is heated in advance until it reaches a saturated state where thermal expansion of the rotating shaft 21 does not occur any more.

  The control device 7 according to the present embodiment is in a saturated state in which the thermal expansion of the rotary shaft 21 does not occur any more so that the outer dimension of the laminate W does not exceed the control range determined by the product standard. Control to preheat the rotating shaft 21 is performed.

  In the present embodiment, the heating is performed by rotating the rotating shaft 21 before performing the cutting process of the stacked body W.

  As the heating, the control device 7 performs control to idle the rotating shaft 21 before performing the cutting processing of the laminated body W.

  For example, a thermal expansion table showing the relationship between the rotation speed (rotation time) of the rotating shaft 21 and the temperature at which the rotating shaft 21 is in a saturated state where no further thermal expansion occurs is set in advance and moved as shown in FIG. Before the laminated body W is moved in the direction V with respect to the cutting member 20 by the device 4, the rotary shaft 21 can be idled in advance until it reaches a saturated state where thermal expansion of the rotary shaft 21 does not occur any more. .

  According to the present embodiment, since the rotary shaft 21 is idled until it reaches a saturation state where no further thermal expansion of the rotary shaft 21 occurs, the thermal expansion of the rotary shaft 21 against the phenomenon that the outer dimension of the optical member gradually decreases. The influence by can be eliminated. Therefore, the optical member F that satisfies the required dimensions can be obtained.

  In the present embodiment, the heating is described as an example in which the rotating shaft 21 is idled before the laminated body W is cut as the heating. However, the present invention is not limited thereto. For example, the heating can be performed by various methods such as heating the rotating shaft 21 with a heater or the like before the laminated body W is cut. Further, as the heating, the rotating shaft 21 may be directly heated or indirectly heated.

  Moreover, although the example which controls the component of the cutting apparatus 1 by the control apparatus 7 was given and demonstrated in the said embodiment, it does not restrict to this. For example, a cutting method using the cutting device 1 may be used by an operator.

  Moreover, in each said embodiment, although the rotating shaft 21 demonstrated and demonstrated the example which extended along the normal line direction of the end surface Wa (refer FIG. 1) of the laminated body W, it does not restrict to this. For example, the rotating shaft 21 may be inclined with respect to the end surface Wa of the stacked body W. That is, the end surface Wa of the laminated body W may be cut obliquely by the cutting blade 24.

  As mentioned above, although the suitable embodiment example which concerns on this embodiment was demonstrated referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Cutting processing apparatus, 2 ... 1st processing apparatus (processing apparatus), 3 ... 2nd processing apparatus (processing apparatus), 7 ... Control apparatus, 20 ... Cutting member, 21 ... Rotary shaft, 24 ... Cutting blade, 25 ... Bearing, 26 ... Cover, 32 ... Cooling member, 33 ... Blower, W ... Laminate (object), Wa ... End face of laminate (end face of object)

Claims (15)

A cutting method for cutting an end face of an optical member,
Preparing a cutting member having a rotating shaft and a cutting blade protruding toward the end face of the optical member;
It is a cutting method of cutting the end surface of the optical member by rotating the cutting blade around the rotation axis and bringing the rotating cutting blade into contact with the end surface of the optical member,
A cutting method for cooling the rotating shaft so that the rotating shaft does not thermally expand.   The cutting method according to claim 1, wherein the rotating shaft is cooled so that the rotating shaft does not thermally expand so that the outer dimension of the optical member does not exceed a required allowable range. The rotating shaft is rotatably supported by a bearing, and both the rotating shaft and the bearing are covered with a cover,
The rotating shaft and the cover can conduct heat through the bearing,
The cutting method according to claim 1 or 2, wherein the cooling is performed by external cooling of the cover with a coolant. The rotating shaft is rotatably supported by a bearing, and both the rotating shaft and the bearing are covered with a cover,
The rotating shaft and the cover can conduct heat through the bearing,
The cutting method according to claim 1 or 2, wherein the cooling is performed by blowing cooling air to the cover with an air cooling unit.   The cutting method according to any one of claims 1 to 4, wherein the rotating shaft is cooled so that an outer dimension tolerance of the optical member is ± 0.05 mm.   The cutting method according to any one of claims 1 to 5, wherein the optical member is a polarizing plate.   The cutting method according to claim 6, wherein the polarizing plate is a polarizing plate including a polyvinyl alcohol film.   The cutting method according to claim 6 or 7, wherein the polarizing plate is a laminate in which a plurality of polarizing plates are overlapped.   The cutting method according to any one of claims 1 to 8, wherein a first processing device and a second processing device, which are each provided with the cutting member and are arranged to face each other, are prepared. Preparing a first pressing member and a second pressing member for fixing the optical member;
The cutting method according to any one of claims 1 to 9, wherein the optical member is sandwiched and fixed between the first pressing member and the second pressing member in cutting. A cutting device for cutting an end face of an optical member,
A cutting member having a rotating shaft and a cutting blade protruding toward the end face of the optical member;
A processing device for cutting the end surface of the optical member by rotating the cutting blade around the rotation axis and bringing the rotating cutting blade into contact with the end surface of the optical member;
A control device that controls the cooling of the rotating shaft so that the rotating shaft does not thermally expand.   The said control apparatus performs control which cools the said rotating shaft so that the said rotating shaft may not thermally expand so that the outer dimension of the said optical member may not become an outer dimension beyond the tolerance | permissible tolerance requested | required. Cutting device. A bearing that rotatably supports the rotating shaft; a cover that covers both the rotating shaft and the bearing; and a cooling unit that can cool the cover with a coolant.
The rotating shaft and the cover can conduct heat through the bearing,
The cutting device according to claim 11 or 12, wherein the control device controls the cooling unit that performs external cooling of the cover. A bearing that rotatably supports the rotating shaft; a cover that covers both the rotating shaft and the bearing; and an air cooling unit that can blow cooling air onto the cover,
The rotating shaft and the cover can conduct heat through the bearing,
The cutting device according to claim 11 or 12, wherein the control device controls an air cooling unit that blows cooling air onto the cover. A method for manufacturing an optical member having an end face cut,
The manufacturing method of the optical member including the process of cutting an end surface with the cutting method as described in any one of Claims 1-10.

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