JP2005164668A - Method and apparatus for sticking polarizing plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polarizing plate sticking apparatus capable of sticking a polarizing plate on a liquid crystal panel while preventing an air bubble from being left between an adhesive and the liquid crystal panel. <P>SOLUTION: On a base plate 12, a moving means 15 is provided which reciprocally move a table 14 holding the liquid crystal panel 13 in a horizontal state. A support frame 18 is provided with an air cylinder 19 so that a slide 19a can vertically move above the table 14, and a roller 21 is supported on the slide 19a in parallel to the table 14 through a support bracket 22. A micrometer 25 restricting at least the lower limit of the distance between the roller 21 and table 14 is fixed above the support frame 18 through a bracket 26. The micrometer 25 can restrict at least the lower limit of the distance between the roller 21 and table 14 and change the lower-limit position by abutting against an engagement plate 27 while a micrometer head 25a vertically extends. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a polarizing plate sticking method and a polarizing plate sticking device, and more particularly to a polarizing plate sticking method and a polarizing plate sticking device for sticking a polarizing plate to a liquid crystal panel.

  Conventionally, as a method of attaching a polarizing plate to a liquid crystal panel, as shown in FIG. 7, a polarizing plate 62 coated with an adhesive 61 is placed on a liquid crystal panel 63, and a roller 64 holds the polarizing plate 62 at a constant pressure. There is a method of attaching the polarizing plate 62 to the liquid crystal panel 63 by moving while pressing. Pressure is applied to the roller 64 by an air cylinder (not shown).

In addition, a polarizing plate pasting method has been proposed in which a pressing force that disturbs the orientation of the smectic liquid crystal is not applied to at least the display area of the liquid crystal panel when sticking the polarizing plate of the liquid crystal panel employing the smectic liquid crystal (patent) Reference 1). In the method described in Patent Document 1, for example, as shown in FIGS. 8A and 8B, an adjustment jig 66 is placed on a work table 65, and the liquid crystal panel 63 is hollowed out of the adjustment jig 66. The electrode substrate 67 is placed on the work table 65 with the electrode substrate 67 on the upper side. Then, the polarizing plate 62 to which the adhesive is applied is temporarily attached to the electrode substrate 67 with a paste at the right side in FIG. The height of the polarizing plate 62 from the upper surface 65 a of the work table 65 on the outer surface is slightly larger than the thickness of the adjustment jig 66. In this state, the pressure roller 68 is rolled along the upper surface of the adjustment jig 66 from the right side to the left side in FIG. In this polarizing plate affixing method, the thickness of the adjustment jig 66 and the upper surface 65 a of the work table 65 to the outer surface of the polarizing plate 62 are set so that the pressure roller 68 does not apply excessive pressure to the polarizing plate 62. By setting so that the difference from the height becomes a predetermined value, an excessive pressure is not applied to the polarizing plate 62.
JP-A-9-120044 (paragraphs [0024] to [0028], [0032], FIGS. 2 and 3)

  However, in the method of moving the roller 64 while applying a constant pressure to the roller 64 as shown in FIG. 7, the polarizing plate 62 is attached to the liquid crystal panel 63 when the movement of the roller 64 is completed. Air bubbles may remain in the adhesive 61 of 62. When viewed from above the polarizing plate 62, a large number of bubbles 69 are generated in the adhesive 61 near the position where the roller 64 first contacts the polarizing plate 62 (in the state of FIG. 9A) or fine bubbles 69. It looks like a strip (state of FIG. 9B). The bubbles 69 often do not disappear even if pressure treatment or heat treatment is performed after the polarizing plate 62 is pasted.

  As a result of investigating the relationship between the amount of deformation of the adhesive and the amount of movement of the roller in order to examine the cause of the generation of the bubbles 69, as shown in FIG. 10, the amount of deformation near the beginning of application (a position where the amount of movement of the roller is small). Was large and then gradually decreased. Based on this knowledge, the generation mechanism of the bubbles 69 is considered as follows. When the deformation amount of the adhesive exceeds a certain value, as shown in FIG. 11A, the adhesive 61 moves so as to be pushed away by the roller 64, and a portion where the thickness of the adhesive 61 is thin is generated. Then, after the roller 64 passes, in a state where the deflection of the polarizing plate 62 is recovered, as shown in FIG. 11B, the air bubbles 69 are present in the thin portion of the adhesive 61.

  In the polarizing plate affixing method described in Patent Document 1, the difference between the thickness of the adjustment jig 66 and the height from the upper surface 65a of the work table 65 to the outer surface of the polarizing plate 62 is set to a predetermined value. Thus, it is possible to prevent an excessive pressure from being applied to the polarizing plate 62. However, there is a problem that air pool (bubbles) is generated between the polarizing plate 62 and the electrode substrate 67 due to the weak pressure, and the liquid crystal panel is placed in the high-temperature and high-pressure chamber in the autoclave process after the polarizing plate 62 is pasted. 63 must be accommodated and left for a certain period of time to remove air pockets.

  In general, since the polarizing plates 62 are attached to both sides of the liquid crystal panel 63, the polarizing plate attaching method described in Patent Document 1 requires at least two types of adjusting jigs 66. In addition, the thickness of the liquid crystal panel 63 and the adhesive 61 may vary depending on the product, and various types of adjustment jigs 66 are required to cope with them.

  The present invention has been made in view of the above-described conventional problems, and a first object thereof is to attach a polarizing plate to a liquid crystal panel in a state in which bubbles are prevented from remaining between the adhesive and the liquid crystal panel. It is in providing the polarizing plate sticking method which can do. Moreover, the 2nd objective is to provide the polarizing plate sticking apparatus which can implement the said polarizing plate sticking method.

  In order to achieve the first object, the invention according to claim 1 is a polarizing plate attaching method in which a polarizing plate is attached to the surface of a liquid crystal panel via an adhesive, and the polarizing plate has an adhesive applied on one side. At least one end of the plate is brought into contact with the liquid crystal panel, and one end of the polarizing plate is pressed by a roller until the distance between the roller and the surface of the liquid crystal panel becomes a predetermined distance, and then the roller and the liquid crystal The roller and the liquid crystal panel in a state in which the distance from the surface of the liquid crystal panel is regulated so that the distance from the surface of the panel is equal to or greater than the predetermined interval and the deformation amount of the adhesive is maintained in a predetermined range. Are moved relative to each other so that the polarizing plate is sequentially pressed against the liquid crystal panel by the roller, thereby sticking the polarizing plate to the surface of the liquid crystal panel.

  In the polarizing plate affixing method of the present invention, the polarizing plate with the adhesive applied on one side is in a state where the distance between the roller and the surface of the liquid crystal panel is a predetermined distance with at least one end thereof in contact with the liquid crystal panel Until pressed by a roller. Thereafter, the roller and the liquid crystal panel are relatively moved in a state in which the distance of the roller to the surface of the liquid crystal panel is regulated so that the deformation amount of the adhesive is maintained in a predetermined range that is equal to or greater than the predetermined interval. Thereby, a polarizing plate is stuck on the surface of the liquid crystal panel. Therefore, the polarizing plate can be attached to the liquid crystal panel in a state where bubbles are prevented from remaining between the adhesive and the liquid crystal panel.

  In order to achieve the second object, the invention described in claim 2 includes a table for holding a liquid crystal panel, a roller provided in parallel with the table, and the roller approaching and separating from the table. A roller moving means for enabling the movement, a regulating means for regulating at least a lower limit of a distance between the roller and the table and changing a lower limit position, and an axial direction of the roller in a state parallel to the table. Moving means for moving relative to the table in the orthogonal direction.

  In the present invention, the polarizing plate is disposed in a state where at least one end thereof is in contact with the liquid crystal panel while the liquid crystal panel is held on the table. Then, the roller is moved to a state where the distance between the roller and the surface of the liquid crystal panel becomes a predetermined distance (lower limit) by the roller moving means, and the polarizing plate is pressed. In this state, the polarizing plate is attached to the liquid crystal panel by moving the roller relative to the table in a direction perpendicular to the axial direction of the roller in a state parallel to the table. Therefore, the polarizing plate can be attached to the liquid crystal panel in a state where bubbles are prevented from remaining between the adhesive and the liquid crystal panel. Further, when the roller is moved in a state where the distance between the roller and the liquid crystal panel is regulated to the lower limit, the polarizing plate can be attached to the liquid crystal panel without changing the gap between the roller and the liquid crystal panel. . Since the lower limit position can be changed, it is possible to easily cope with a pasting condition in which the thickness of the liquid crystal panel, the polarizing plate, or the adhesive is different.

  According to a third aspect of the present invention, in the second aspect of the present invention, the restricting means is configured to be capable of restricting a lower limit and an upper limit of a distance between the roller and the table. In this invention, the roller is moved to a state where the distance between the roller and the surface of the liquid crystal panel is a predetermined interval (lower limit), and the roller is pressed. Thereafter, the roller is moved in a direction perpendicular to the axial direction of the roller while the roller is parallel to the table and the distance between the roller and the liquid crystal panel is maintained within a predetermined range, and the polarizing plate is attached to the liquid crystal panel. Is done. Therefore, the polarizing plate can be attached to the liquid crystal panel in a state where bubbles are prevented from remaining between the adhesive and the liquid crystal panel. In addition, since the upper limit is also restricted, it is possible to prevent the adhesive from being insufficiently adhered due to insufficient pressure applied by the roller and insufficient adhesion.

  The invention according to claim 4 is the invention according to claim 2 or claim 3, wherein the roller moving means is configured to move the roller by an air cylinder, and the restricting means includes a micrometer, and the roller The micrometer head of the micrometer comes into contact with a support member that supports the member or a member that moves integrally with the support member, thereby restricting the movement thereof.

  In this invention, the roller moving means, that is, the micrometer head of the micrometer is in contact with the support member that supports the roller or the member that moves integrally with the support member in a state where the air cylinder is driven to bring the roller closer to the table. This restricts the movement of the roller. Also, after the roller is moved relative to the table from the state where the distance between the roller and the surface of the liquid crystal panel is a predetermined distance (lower limit), the distance between the roller and the surface of the liquid crystal panel becomes larger than the upper limit. This is regulated by another micrometer. Therefore, the configuration for accurately controlling the distance between the roller and the surface of the liquid crystal panel is simpler than when the ball screw mechanism is used.

  According to invention of Claims 1-4, a polarizing plate can be stuck to a liquid crystal panel in the state which prevented the bubble remaining between an adhesive and a liquid crystal panel.

(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS. 1 is a schematic side view of a polarizing plate sticking apparatus, FIG. 2A is a partially enlarged view of FIG. 1, and FIG. 2B is a partially broken partial enlarged view of FIG.

  As shown in FIG. 1, the polarizing plate pasting apparatus 11 includes a base plate 12, and a moving means 15 that reciprocates a table 14 that holds a liquid crystal panel 13 in a horizontal state is provided on the base plate 12. The table 14 is configured to suck and hold the liquid crystal panel 13 by vacuum (reduced pressure). As the moving means 15, a ball screw is used, and a known device having a configuration in which a moving body 16 that can move integrally with a nut is moved in one axial direction is used. The ball screw is driven forward and reverse by a servo motor 17. The moving means 15 constitutes a moving means for relatively moving a roller described later in a direction perpendicular to the axial direction of the roller in a state parallel to the table 14.

  A support frame 18 is provided on the base plate 12, and an air cylinder 19 with a slide (hereinafter simply referred to as an air cylinder 19) is provided on the support frame 18 so that the slide 19 a can move in the vertical direction above the table 14. And is supported via a bracket 20. On the slide 19a, a roller 21 is supported in parallel with the table 14 via a support bracket 22 as a support member. The roller 21 is formed to have a length equal to or greater than the width of the liquid crystal panel 13 (the length in the direction perpendicular to the paper surface in FIG. 1). The air cylinder 19 constitutes a roller moving means for moving the roller 21 so as to approach and separate from the table 14.

  The support frame 18 is provided with a polarizing plate supply unit 23. The polarizing plate supply unit 23 is configured to be capable of adsorbing and holding the polarizing plate 24 coated with an adhesive 24a (shown in FIG. 2A) on one side so that the adhesive 24a side is on the table 14 side. The polarizing plate supply unit 23 is formed so as to be capable of being sucked and held so that the polarizing plate 24 is inclined downward with one end thereof positioned below the roller 21.

  On the support frame 18, a restricting means for restricting at least the lower limit of the distance between the roller 21 and the table 14 is provided. The restricting means is constituted by a micrometer 25, and the micrometer 25 is supported on the support frame 18 via the bracket 26 with the micrometer head 25a extending vertically upward. The micrometer head 25 a is in contact with the engagement plate 27 fixed to the support bracket 22 to regulate the lowering of the support bracket 22, that is, the lowering of the roller 21. The engagement plate 27 constitutes a member that moves integrally with the support bracket 22 (support member). The micrometer 25 is configured to be able to adjust the protruding amount of the micrometer head 25a on the order of 1 μm.

  The servo motor 17 and the air cylinder 19 are driven and controlled by a control device (not shown). The servo motor 17 is driven to move the table 14 after the roller 21 is moved to the lowest position by driving the air cylinder 19.

  For convenience of illustration, the relationship between the size and thickness ratio of the liquid crystal panel 13, the table 14, and the polarizing plate 24 and the size of the air cylinder 19, the roller 21, and the micrometer 25 are depicted in a state different from the actual state. Yes.

Next, the polarizing plate sticking method which sticks the polarizing plate 24 on the surface of the liquid crystal panel 13 using the polarizing plate sticking apparatus 11 comprised as mentioned above is demonstrated.
First, the liquid crystal panel 13 is set on the table 14, and then the micrometer 25 is adjusted so that the micrometer head 25a has a predetermined protruding amount. The predetermined protrusion amount is set to a value at which the distance between the roller 21 and the surface of the liquid crystal panel 13 when the roller 21 is moved to a position pressing the polarizing plate 24 against the liquid crystal panel 13 is a predetermined interval. This value varies depending on the thickness of the liquid crystal panel 13, the polarizing plate 24, and the adhesive 24a, and is set so as to be a value determined in advance by a test. Next, the polarizing plate 24 is set in the polarizing plate supply unit 23. The polarizing plate 24 is set in a state where one end is placed on the liquid crystal panel 13 below the roller 21. Thus, preparation for attaching the polarizing plate 24 is completed.

  Next, the polarizing plate sticking apparatus 11 is driven. First, the air cylinder 19 is driven, the roller 21 is moved downward together with the support bracket 22, and the engagement plate 27 is also moved downward together with the support bracket 22. After the roller 21 comes into contact with the polarizing plate 24 at one end of the polarizing plate 24, the roller 21 is further lowered and the polarizing plate 24 is pressed to a position where the adhesive 24a is deformed by a predetermined amount. The plywood 27 comes into contact with the roller 21 so that the downward movement of the roller 21 is restricted. In this state, the polarizing plate 24 is in a state where the adhesive 24a is pressed to the liquid crystal panel 13 side with an appropriate adhesion force.

  Next, the servo motor 17 is driven to move the table 14 to the right in FIG. That is, the roller 21 is moved relative to the table 14 in a direction perpendicular to the axial direction of the roller 21 in a state parallel to the table 14. As the table 14 moves, the polarizing plate 24 is pulled out along the suction surface against the suction force of the polarizing plate supply unit 23. The polarizing plate 24 is pressed toward the liquid crystal panel 13 by the roller 21, and the roller 21 is rotated as the polarizing plate 24 is pulled out. And the polarizing plate 24 is affixed sequentially on the liquid crystal panel 13 from one end side (right side of FIG. 1, FIG. 2 (a)) toward the other end side.

  The moving speed of the table 14 is not constant but gradually increases. Therefore, even if the roller 21 presses the polarizing plate 24 with a constant pressure, after the table 14 starts moving, the pressing time of the roller 21 with respect to each pressing position is shortened, and as a result, the polarizing plate 24 is pressed to the liquid crystal panel 13 side. The time, that is, the time for deforming the adhesive 24a is shortened. Therefore, in the conventional pasting method, after the roller 21 moves relative to the liquid crystal panel 13 by a certain distance, the deformation amount of the adhesive 24a gradually decreases. However, in this embodiment, the air cylinder 19 has a pressing force that holds the roller 21 in the lower limit position even when the table 14 is moved and the roller 21 is relatively moved to near the end of pressing the polarizing plate 24 by the roller 21. Since the pressure of the compressed air supplied to is set, the relationship between the adhesive deformation amount and the movement amount of the roller 21 is constant as shown by the solid line in FIG. The broken line shows the relationship between the amount of deformation of the adhesive and the amount of movement of the roller 21 when there is no micrometer 25 (regulating means).

  The table 14 continues to move even after the liquid crystal panel 13 has passed the position corresponding to the roller 21, and is moved to a position where the liquid crystal panel 13 does not correspond to the support frame 18, as indicated by a chain line in FIG. 1. Next, the adsorption action of the liquid crystal panel 13 by the table 14 is released, the liquid crystal panel 13 is removed from the table 14, and the polarizing plate 24 is applied to the opposite surface of the liquid crystal panel 13 by another polarizing plate attaching device (not shown). Affixing work is performed. The polarizing plate 24 is attached to both surfaces of the liquid crystal panel 13, and the attaching operation of the polarizing plate 24 is completed.

This embodiment has the following effects.
(1) The polarizing plate pasting apparatus 11 includes a table 14 that holds the liquid crystal panel 13, a roller moving unit that moves the roller 21 so as to approach and separate from the table 14 in a state parallel to the table 14, and the roller 21. And a regulating means that regulates at least the lower limit of the distance between the table 14 and the lower limit position. A moving means 15 is provided for moving the roller 21 relative to the table 14 in a direction perpendicular to the axial direction of the roller 21 in a state parallel to the table 14. Accordingly, when the polarizing plate 24 is pressed by the roller 21, the distance between the roller 21 and the surface of the liquid crystal panel 13 having a value corresponding to the deformation amount of the adhesive 24 a is maintained at a predetermined interval (lower limit) or more. . As a result, it is possible to prevent the deformation amount of the adhesive 24a from becoming excessive, and it is possible to prevent bubbles from remaining in the adhesive 24a when the application of the polarizing plate 24 is completed.

  (2) Since the roller 21 is moved along the table 14 in a state where the distance between the roller 21 and the liquid crystal panel 13 is restricted to the lower limit, the polarizing plate is obtained without changing the gap between the roller 21 and the liquid crystal panel 13. 24 can be attached to the liquid crystal panel 13.

  (3) Since the table 14 is moved in a state where the liquid crystal panel 13 is held horizontally, a mechanism for holding the liquid crystal panel 13 is simpler than a configuration in which the liquid crystal panel 13 is held in a vertical state or an oblique state. Therefore, the adsorption power may be weak.

  (4) The roller moving means for moving the roller 21 so as to be close to and away from the table 14 in a state parallel to the table 14 is configured to move the roller 21 by the air cylinder 19. The regulating means includes a micrometer 25, and the micrometer head 25 a of the micrometer 25 abuts a part of the member (engagement plate 27) that moves integrally with the support member (support bracket 22) that supports the roller 21. The movement is regulated. Therefore, the configuration for accurately regulating the distance between the roller 21 and the surface of the liquid crystal panel 13 so as to have a value corresponding to the deformation amount of the adhesive 24a is simpler than when the ball screw mechanism is used.

  (5) The moving means 15 for moving the roller 21 relative to the table 14 in a direction perpendicular to the axial direction of the roller 21 in a state parallel to the table 14 moves the roller 21 side because of the configuration for moving the table 14. The structure is simple compared to the configuration to be made.

  (6) The polarizing plate 24 is pulled out from one end side so as to come into contact with the liquid crystal panel 13 in a state where the polarizing plate 24 is attracted and held obliquely by the polarizing plate supply unit 23, and is pressed by the roller 21. Therefore, bubbles are less likely to remain as compared with the sticking method in which the entire surface coated with the adhesive 24a from the beginning is placed on the liquid crystal panel 13 and pressed by the roller 21 from one end of the polarizing plate 24. Become.

(Second Embodiment)
Next, a second embodiment will be described. In this embodiment, the lower limit of the distance between the roller 21 and the table 14 is restricted at the time of attaching the polarizing plate 24, that is, the movement of the roller 21 downward from the lower limit position is restricted, but the upper limit of the distance from the lower limit position is restricted. This is different from the first embodiment in that the movement is allowed. The basic structure of the polarizing plate pasting apparatus 11 is the same, but the pressure of the compressed air supplied to the air cylinder 19 is lowered from the time when the roller 21 is moved relative to the table 14 in parallel and moved by a predetermined amount. This is different from the first embodiment.

  As a means for adjusting the pressure of the compressed air supplied to the air cylinder 19, a pressure adjusting valve (not shown) is provided in the middle of the piping that supplies the compressed air to the air cylinder 19. Then, the pressure of the supply air to the air cylinder 19 is lowered a predetermined time after the movement of the table 14 is started by a command from the control device. Conventionally, the pressure of the supply air to the air cylinder 19 is set to be the same as the pressure supplied to apply the pressing force to the roller 21.

  In this embodiment, the relationship between the adhesive deformation amount and the movement amount of the roller is as shown by a solid line in FIG. That is, the table 14 is moved in a state where the roller 21 is disposed at a position where the polarizing plate 24 is pressed, and the pressure of the air supplied to the air cylinder 19 is reduced when the roller is moved by a predetermined amount. The amount of deformation of the adhesive 24a by 21 gradually decreases. The broken line shows the relationship between the amount of deformation of the adhesive and the amount of movement of the roller 21 when there is no micrometer 25 (regulating means). This embodiment has the same effects as (1) and (3) to (6) of the first embodiment.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. This embodiment is different from the both embodiments in that the regulating means is configured to regulate the lower limit and the upper limit of the distance between the roller 21 and the table 14 at the time of attaching the polarizing plate 24.

  As shown in FIG. 5, in addition to the micrometer 25 similar to that in the first embodiment, a micrometer 28 that restricts the upward movement of the roller 21 is provided as the restricting means. The micrometer 28 is supported by a bracket 29 provided so as to be rotatable with respect to the support frame 18 with a micrometer head 28a extending vertically downward. The bracket 29 can be rotated between a retracted position where the micrometer 28 does not hinder the movement of the engaging plate 27 and a restricting position where the micrometer 28 is disposed above the engaging plate 27, and between the retracted position and the restricting position. The rotary actuator 30 is configured to be rotatable.

  In the polarizing plate sticking apparatus 11 of this embodiment, the micrometer 28 that restricts the upper limit of the roller 21 at the time of sticking work is always disposed at a retracted position that does not interfere with the engagement plate 27. Then, as preparation work for the pasting work, placing the liquid crystal panel 13 on the table 14, adjusting the micrometer 25 with the micrometer head 25 a as a predetermined protruding amount, and setting the polarizing plate 24 to the polarizing plate supply unit 23. In addition, the adjustment work of the micrometer 28 is added. The adjustment work of the micrometer 28 is performed before the movement of the table 14 is started in a state where the roller 21 is moved to the lower limit position. With the roller 21 moved to the lower limit position, the micrometer 28 is disposed at the restriction position, and the bracket 29 is fixed at that position. In this state, the micrometer 28 is adjusted so that the protruding amount of the micrometer head 28a becomes a predetermined value. The above is the preparation work for the pasting work. That is, in this embodiment, the operation of driving the air cylinder 19 to move the roller 21 to the lower limit position is a preparation operation for the pasting operation.

  Next, the servo motor 17 is driven to start the pasting operation. In response to a command from the control device, the pressure of the supply air to the air cylinder 19 is lowered a predetermined time after the movement of the table 14 is started. As in the case of the second embodiment, the roller 21 is raised little by little, and the deformation amount of the adhesive 24a by the roller 21 is gradually reduced. When the roller 21 is allowed to freely move up and down, the pressing force on the adhesive 24a is insufficient, and the adhesive 24a may not be in close contact with the liquid crystal panel 13 at the last part, and bubbles may be generated. However, in this embodiment, the upward movement of the roller 21 is regulated by the micrometer 28, so that the amount of deformation of the adhesive 24a due to insufficient pressing force by the roller 21 is prevented from becoming insufficient.

Therefore, this embodiment has the following effects in addition to the same effects as (1) and (3) to (6) of the first embodiment.
(7) Since the upper limit of the distance between the roller 21 and the table 14 is also restricted when the polarizing plate 24 is stuck, the roller 21 is moved relative to the table 14 in the horizontal direction and then supplied to the air cylinder 19. When the pressure of the compressed air to be reduced is reduced, the pressing force by the roller 21 can be prevented from being insufficient even if the amount of reduction is not strictly controlled.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. In this embodiment, instead of the air cylinder 19 as a roller moving means, a known one having a ball screw driven by a servo motor 31 and moving a movable body 32 that can move integrally with the nut in one axial direction is used. Has been. The support bracket 22 is fixed to a moving body 32, and the roller 21 is moved up and down by driving a servo motor 31.

  In this embodiment, since the height of the roller 21 can be adjusted by the drive control of the servo motor 31, the roller moving means can restrict at least the lower limit of the distance between the roller 21 and the table 14 and can also be a restricting means capable of changing the lower limit position. Function. Therefore, depending on the drive control conditions of the servo motor 31, the pasting operation can be performed with the roller 21 held at the lower limit position as in the first embodiment, or the upper limit of the roller 21 as in the third embodiment. It is also possible to perform the pasting work in a state where the lower limit and the lower limit are regulated. Therefore, this embodiment has the same effects as (1) to (3), (5), (6) of the first embodiment and (7) of the third embodiment.

The embodiment is not limited to the above, and may be embodied as follows, for example.
A restricting means that restricts at least the lower limit of the distance between the roller 21 and the table 14 and can change the lower limit position includes a ball screw driven by a micrometer 25 or a servo motor 31, and a movable body 32 that can move integrally with the nut. It is not restricted to the thing of the structure which moves to 1 axial direction. For example, a spacer may be provided to restrict the downward movement of the slide 19a. In this case, a plurality of spacers are prepared corresponding to the pasting conditions or a plurality of spacers are stacked to adjust the interval.

  ○ Restricting at least the lower limit of the distance between the roller 21 and the table 14, and as a restricting means capable of continuously changing the lower limit position, it is supported rotatably at the eccentric position and can be fixed at an arbitrary rotating position. A provided disc may be used.

  ○ The polarizing plate 24 is placed in a state where the entire surface of the adhesive 24a is in contact with the liquid crystal panel 13 without being limited to the sticking method in which the polarizing plate 24 is pressed with the roller 21 while being in contact with the liquid crystal panel 13 in order from one end. From this state, the roller 21 may be moved relative to the liquid crystal panel 13 while being pressed by the roller 21 from one end of the polarizing plate 24.

  ○ The moving means for moving the roller 21 relative to the table 14 in the direction perpendicular to the axial direction of the roller 21 in a state parallel to the table 14 is not limited to the configuration for moving the table 14 side, but moves on the roller 21 side. A configuration may be adopted.

  The table 14 is not limited to a configuration in which the table 14 is moved while holding the liquid crystal panel 13 horizontally, but may be configured to be moved while holding the liquid crystal panel 13 in a vertical state or an oblique state. When the size of the liquid crystal panel 13 is increased, the area of the liquid crystal panel 13 is increased. In the configuration in which the liquid crystal panel 13 is moved while being held horizontally, the floor area necessary for installing the polarizing plate pasting apparatus 11 is increased. Or in the structure where the table 14 hold | maintained in the diagonal state is moved, the floor area required for installation of the polarizing plate sticking apparatus 11 can be made small.

The technical idea (invention) that can be grasped from the embodiment will be described below.
(1) In the invention according to any one of claims 2 to 4, the table that holds the liquid crystal panel holds the liquid crystal panel in a vertical state or an inclined state.

  (2) In the invention according to any one of claims 2 to 4 and the technical idea (1), a polarizing plate is disposed on the liquid crystal panel held by the table, and the adhesive 24a is disposed on the liquid crystal panel side. In this state, a polarizing plate supply unit is provided to supply from one end side.

The schematic side view of the polarizing plate sticking apparatus of 1st Embodiment. (A) is the elements on larger scale of FIG. 1, (b) is the partially broken partial enlarged view of FIG. The graph which shows the relationship between an adhesive deformation amount and the movement amount of a roller. The graph which shows the relationship between the adhesive deformation amount of 2nd Embodiment, and the movement amount of a roller. The model partial side view of the polarizing plate sticking apparatus of 3rd Embodiment. The model partial side view of the polarizing plate sticking apparatus of 4th Embodiment. The schematic side view of the sticking state of a polarizing plate. (A) is a partially broken side view of the prior art, and (b) is a partially broken front view of the same. (A), (b) is a schematic top view which shows the generation | occurrence | production state of a bubble. The graph which shows the relationship between the deformation amount of an adhesive, and the movement amount of a roller. (A) is a schematic side view which shows the deformation | transformation state of an adhesive, (b) is a schematic side view which shows the bubble remaining state.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Polarizing plate sticking apparatus, 13 ... Liquid crystal panel, 14 ... Table, 15 ... Moving means, 19 ... Air cylinder as roller moving means, 21 ... Roller, 24 ... Polarizing plate, 24a ... Adhesive, 25, 28 ... Regulation Micrometer as a means, 25a, 28a... Micrometer head.

Claims (4)

A polarizing plate pasting method of sticking a polarizing plate on the surface of a liquid crystal panel via an adhesive,
At least one end of a polarizing plate coated with an adhesive on one side is brought into contact with the liquid crystal panel, and one end of the polarizing plate is pressed by a roller until the distance between the roller and the surface of the liquid crystal panel becomes a predetermined distance. Then, the distance between the roller and the surface of the liquid crystal panel is regulated so that the distance between the roller and the surface of the liquid crystal panel is not less than the predetermined distance and the deformation amount of the adhesive is maintained within a predetermined range. A polarizing plate attaching method in which the roller and the liquid crystal panel are relatively moved in a state, and the polarizing plate is attached to the surface of the liquid crystal panel by sequentially pressing the polarizing plate against the liquid crystal panel by the roller. A table for holding the liquid crystal panel;
A roller provided in parallel with the table;
Roller moving means for moving the roller so as to approach and separate from the table;
A regulating means for regulating at least the lower limit of the distance between the roller and the table and changing the lower limit position;
A polarizing plate pasting device comprising: a moving means for moving the roller relative to the table in a direction perpendicular to the axial direction of the roller in a state parallel to the table.   The polarizing plate sticking apparatus according to claim 2, wherein the restricting unit is configured to be able to restrict a lower limit and an upper limit of a distance between the roller and the table.   The roller moving means is configured to move the roller by an air cylinder, and the regulating means includes a micrometer, and the micrometer of the micrometer is attached to a support member that supports the roller or a member that moves integrally with the support member. The polarizing plate sticking apparatus of Claim 2 or Claim 3 which a head contacts and controls the movement.

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