JPS63212903A - Polarizing plate sticking device - Google Patents

Abstract

PURPOSE:To stick a polarizing plate without generating a bubble between the polarizing plate and a substrate, by opposing the polarizing plate and the substrate, and sticking the polarizing plate to the substrate by pressing it uniformly by a working roller. CONSTITUTION:A substrate 12 of a liquid crystal cell, etc., is held on a moving stage 15 which can move in the right and left directions. Also, a polarizing plate 13 is held to a polarizing plate holding body 16 by an adsorbing mechanism. Subsequently, the polarizing plate 13 and the substrate 12 are opposed by positioning an origin, and the polarizing plate holding body 16 is closed against the moving stage 15. Next, the moving stage 15 is moved in the left direction, a pressure roller 17 is allowed to descend and the polarizing plate 13 is stuck to the substrate 12 by a prescribed pressure. In that case, the polarizing plate 13 moves to the polarizing plate holding body 16 as the sticking operation advances and in accordance therewith, a suction of an adsorbing hole of the polarizing plate holding body 16 is stopped, and an adsorption holding force is weakened. Accordingly, since the pressure roller is provided independently from the polarizing plate holding body, a bubble which is apt to be generated between the polarizing plate and the substrate can be suppressed by a high pressing force.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a polarizing plate pasting device for pasting a polarizing plate on the surface of a substrate.

(Prior Art) For example, in a liquid crystal display, two transparent glass substrates each having a display electrode and an alignment film formed on their inner walls are placed facing each other in parallel with an interval of 5 to 10 μm, and the periphery of the glass substrates is It has a liquid crystal cell that is adhesively fixed with a sealant and filled with a liquid crystal substance between glass substrates.Polarizing plates are pasted on the front and back surfaces of this liquid crystal cell, and characters are displayed by applying a voltage from the outside to the display electrodes. There are some that are configured to display objects, figures, etc.

In such a liquid crystal display, a polarizing plate pasting device is used in the process of pasting polarizing plates on the front and back surfaces of a liquid crystal cell.

Conventionally, as shown in FIG. 3, this polarizing plate pasting device is provided with a movable stage 2 that holds a liquid crystal cell 1 on its upper surface so as to be movable back and forth, and a polarizing plate holder 4 that holds a polarizing plate 3 on its lower surface by suction. is rotatably provided by a hydraulic [1-tally actuator 5], and a polarizing plate 3 is attached to the tip of the polarizing plate holder 4.
A pressure roller 6 that presses the liquid crystal cell 1 against the liquid crystal cell 1 is rotatably provided. Then, the pressure roller 6 applies pressure to the tip of the polarizing plate 4 to stick it to the liquid crystal cell 1 using the rotational torque of the rotary actuator 5, and by moving the moving stage 2 in the direction of arrow a, the pressure roller 6 is applied. The polarizing plate 3 is attached to the surface of the liquid crystal cell 1 while pushing out air bubbles caught between the lower surface of the polarizing plate 3 and the surface of the liquid crystal cell 1 using pressure.

(Problems to be Solved by the Invention) In the conventional polarizing plate pasting device as described above, the pressure roller 6
The polarizing plate 3 is pasted on the surface of the liquid crystal cell 1 while pushing out the air bubbles caught between the polarizing plate 3 and the liquid crystal cell 1 with the pressure of the pressure roller 6. The length of the polarizing plate holder 4 is determined by the distance from the tally actuator 5 to the pressure roller 6, so there is a limit to the pressure force.
Therefore, when attaching the wide polarizing plate 3 in the axial direction of the pressure roller 6, the pressing force was insufficient, and air bubbles were likely to be generated between the polarizing plate 3 and the liquid crystal cell 1.

The present invention was developed in view of the above-mentioned problems, and even when a wide polarizing plate is pasted in the axial direction of the pressure roller, insufficient pressure does not occur, and no pressure is generated between the polarizing plate and the substrate. It is an object of the present invention to provide a polarizing plate pasting device that can reliably suppress air bubbles that tend to occur.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a movable stage that holds a substrate to which a polarizing plate is pasted on its upper surface and is movable in the pasting operation direction, and a polarizing plate that holds the polarizing plate on its lower surface. The holding body is opened so as to face the top surface of the moving stage at the origin position of the moving stage, and the polarizing plate held by the polarizing plate holding body is moved in accordance with the movement of the moving stage in the pasting operation direction. A pressure opening for applying pressure to the substrate of the moving stage is provided independently of the polarizing plate holder.

(Function) In the present invention, the polarizing plate held on the bottom surface of the polarizing plate holder is opposed to the substrate held on the top surface of the moving stage, and as the moving stage moves in the pasting operation direction, the polarizing plate The polarizing plate is attached to the substrate by the pressure of a pressure roller using a drive source independent of the holder.

(Embodiment) Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Reference numeral 11 denotes the body of a polarizing plate pasting device for pasting a polarizing plate 13 onto a substrate 12 such as a liquid crystal cell of a liquid crystal display, and an opening 14 is provided on the top surface, and the cover plate 12 is held at the opening 14. A moving stage 15 for holding the polarizing plate 13, a polarizing plate holder 16 for holding the polarizing plate 13, and a pressurizing port 517 for pasting the polarizing plate 13 onto the substrate 12 are provided.

The moving stage 15 is capable of reciprocating approximately 400 am to the left from the origin position shown in FIG. 19 are provided at right angles, and a plurality of suction holes (not shown) for suctioning and holding the substrate 12 are formed. In addition,
The origin position of the moving stage 15 can be adjusted by a longitudinal position adjustment handle 20 and a lateral position adjustment handle 21 provided on the front surface of the body 11.

The polarizing plate holder 16 is provided so as to be openable and closable with respect to the upper surface of the movable stage 15 with its rear edge as a fulcrum, and its lower surface includes a front-rear positioning plate 22 for positioning the polarizing plate 13 and a left-right positioning plate 22 for positioning the polarizing plate 13. A plate 23 is provided at right angles.

Although not shown, a plurality of suction holes for vacuum suctioning the polarizing plate 13 are formed on the lower surface of the polarizing plate holder 16, and independent vacuum piping is connected to each suction hole row in the front and rear direction. Each vacuum pipe is connected to a vacuum pump via a solenoid valve. .

In addition, the on/off of each solenoid valve is controlled by the moving stage 1.
During the pasting operation, the detection plate of the moving stage 15 that moves to the left comes into contact with the microswitches located on the right side in order, thereby detecting the polarizing plate. Holder 16
The electromagnetic valves corresponding to the suction hole rows located on the right side are operated in order to sequentially release the introduction of vacuum pressure.

Therefore, these independent vacuums 1i! pipes, solenoid valves,
The suction stop function is configured by a micro switch, etc.

Furthermore, the vacuum piping system is provided with a leak mechanism that adjusts the vacuum pressure introduced to each suction hole using a leak valve.

The pressure roller 17 has an elastic body 17a made of rubber or the like on its circumferential surface, is rotatably supported by supports 24 at both ends, and is movable left and right and up and down by air cylinders connected to each support 24. And, the air cylinder pressure during the downward movement is the pressing force when pasting the polarizing plate 13, and this pressing force can be set in the range of 10 to 100 degrees.

Further, on the front side of the body 11, there are provided a control panel 25 for controlling the operation of each mechanism, and an air control panel 26 for controlling the air pressure of each air cylinder.

Further, the polarizing plate 13 has an adhesive coated on its surface and a separator film attached thereto in a removable manner.

Then, the substrate 12 is set at a predetermined position on the upper surface of the moving stage 15 and held by suction, and the polarizing plate 13 is set at a predetermined position on the lower surface of the open polarizing plate holder 16 and held by suction.

Then, the separator film on the surface of the polarizing plate 13 is peeled off to expose the adhesive surface, and the polarizing plate holder 16 is tilted forward to be in an open state. In this state, the substrate 12 and the polarizing plate 13 face each other in parallel, and the gap between them is about 21! m.

Thereafter, the pasting operation is automatically performed by operating the start switch.

First, the pressure roller 17 moves to the right and then descends.
The tip of the polarizing plate 13 protruding from the end of the polarizing plate holder 16 is attached to the substrate 12 with a predetermined pressure.

At this time, the width of the polarizing plate 13 to be pasted is approximately 1 m from the tip, and the tip of the polarizing plate 13 needs to be at the center of the pressure roller 17.

Subsequently, the leak mechanism is activated to weaken the adsorption and holding force of the polarizing plate holder 16, thereby making it easier for the polarizing plate 13 to slide relative to the polarizing plate holder 1B. This is because when the moving stage 15 starts moving leftward, tension concentrates on the part of the polarizing plate 13 that is being pressed by the pressure roller 17, causing a positional shift in the polarizing plate 13, and causing the polarizing plate 13 to shift. This is to prevent air bubbles from forming between the substrate 13 and the substrate 12.

Subsequently, the moving stage 15 starts moving to the left, and the substrate 12 and polarizing plate 13 move together, and
The pressure roller 17 sequentially attaches the polarizing plate 13 to the substrate 12 as the pressure roller 17 moves. Substrate 12 of this polarizing plate 13
When the length of the pasted part on the polarizing plate 1 reaches approximately 20 m, the leak mechanism is released by the timer and the polarizing plate 1
3 is held by the polarizing plate holder 16 again with the original holding force.

This release of the leakage mechanism is because the attached portion of the polarizing plate 13 will no longer be displaced due to tension.

In addition, as the pasting of the polarizing plate 13 progresses, the polarizing plate 1
3 slides to the left on the lower surface of the polarizing plate holder 16, and the suction hole located on the right side of the polarizing plate holder 16 is exposed.
By moving the moving stage 15 to the left, each microswitch is turned on, and the solenoid valve corresponding to each microswitch is activated, sequentially blocking the introduction of vacuum pressure to the exposed suction holes. Sufficient suction and holding power can be maintained until the pasting of the plate 13 is completed, and it is possible to prevent dust in the air from being drawn into the adhesive surface of the polarizing plate 13.

Then, when the pasting of the polarizing plate 13 is completed up to the rear end,
The pressure roller 11 elegantly moves back to the left, the moving stage 15 moves rightward and returns to the original position, and furthermore, the suction of the moving stage 15 and the polarizing plate holder 16 is stopped.

Thereafter, the polarizing plate holder 16 is opened, and the substrate 12 to which the polarizing plate 13 has been pasted is taken out, thereby completing the pasting operation.

Note that the pressing force of the pressure roller 17 is adjusted depending on the size of the substrate 12 and the polarizing plate 13.
Even when the number 3 is large, insufficient pressing force can be prevented from occurring.

〔Effect of the invention〕

According to the present invention, since the pressure roller is provided independently of the polarizing plate holder, a high pressure force can be obtained by using a drive source such as an air cylinder, and a wide polarized light can be generated in the axial direction of the pressure roller. Even when attaching plates, insufficient pressure will not occur, and bubbles that tend to occur between the polarizing plate and the substrate can be reliably suppressed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the polarizing plate pasting device of the present invention, FIG. 2 is a cross-sectional view of the pasted state, and FIG. 3 is a side view of a conventional polarizing plate pasting device in the pasted state. . 12... Substrate, 13... Polarizing plate, 15... Moving stage, 16... Polarizing plate holder, 17... Pressure roller. Half 2 drawings

Claims (4)

[Claims] (1) A moving stage that holds the substrate to which the polarizing plate is attached on its upper surface and is movable in the pasting operation direction, and a moving stage that holds the polarizing plate on its lower surface and faces the upper surface of the moving stage at the origin position of the moving stage. A polarizing plate holder is provided independently of the polarizing plate holder, and the polarizing plate held by the polarizing plate holder is moved to the moving stage in accordance with the movement of the moving stage in the pasting operation direction. A polarizing plate pasting device characterized by comprising: a pressure roller that applies pressure to a substrate for pasting; (2) The polarizing plate pasting device according to claim 1, wherein the polarizing plate holder holds the polarizing plate by adsorption. (3) The polarizing plate holder has a plurality of suction holes for adsorbing the polarizing plate, and the suction holes that open as the polarizing plate moves relative to the polarizing plate holder as the pasting operation progresses. 3. The polarizing plate pasting device according to claim 2, further comprising a suction stopping mechanism for stopping the polarizing plate. (4) A leakage mechanism is provided which temporarily weakens the suction force with which the polarizing plate holder holds the polarizing plate when the moving stage starts moving in the pasting direction. The polarizing plate pasting device according to item 3.