JPS5935793B2 - Bubble-free vacuum bonding mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bubble-free vacuum bonding mechanism for bonding, for example, liquid crystal cells and polarizing plates to each other in a vacuum chamber.

Generally, when two or more members are bonded together to make a product, pressure bonding is commonly used through an adhesive layer, but in the case of products such as liquid crystal cells and polarizing plates, the bonded surface If air bubbles are present in between, the quality will deteriorate, so a method is adopted in which bonding is performed in a vacuum to prevent the generation of air bubbles.

Conventional methods of applying pressure in a vacuum applied pressure to the parts to be bonded together in a flat manner, which made it difficult to align them with each other, and vacuum bubbles remained because the pressure was applied in a flat manner. There is a problem.

This invention was made to solve the above-mentioned problems, and it is possible to accurately align the lamination position, and the lamination without bubbles can be obtained by pressure bonding using roll pressure. The purpose is to provide.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, the casing 1 has an airtight structure at the peripheral wall and the lower part, and is formed into a hollow box shape with an open upper edge.A connection port 3 with a vacuum exhaust mechanism is provided at the upper part of the front wall 2, and the inside is kept in a vacuum state. is maintained.

A horizontal screen 4 is stretched inside the upper part of the casing 1 so that its vertical height can be adjusted by supporting a screw shaft 5. The screen 4 has a porous structure, or a gap is provided between the periphery and the casing 1, so that the upper surface side is in a sufficient vacuum state. A horizontal screw shaft T, which is rotatable by being supported by a round bearing, and a guide shaft 8 parallel to and at the same height as the screw shaft 1 are installed between the side walls 6 and 6 in the casing 1, The screw shaft T utilizes one end that passes through the side wall 6 in an airtight manner,
It is interlocked with a forward/reverse motor 10 installed on the base 9.

Inside the casing 1, a movable table 11 that is movable in the axial direction of the guide shaft 8 and the screw shaft T is provided. This movable table 11 has a movable member 12 that is externally fitted and slid on the guide shaft 8.
and a moving member 1 having a screw hole 13 that is screwed into the screw shaft T.
4 is provided, and reciprocates in the horizontal direction by forward and reverse rotation of the screw shaft T. Note that although the reciprocating movement and stroke of the movable table 11 are not shown, they are performed by controlling forward and reverse rotation, starting, and stopping of the motor 10 using a limit switch that detects the movable table 11. A cylinder 15 is attached to the movable table 11 with its piston rod 16 facing upward, and a lifting table IT fixed to the upper end of the piston rod 16 rotatably supports a compaction roll 18.

Air is supplied and discharged to and from the cylinder 15 through an air pipe that passes through the casing 11 in an airtight manner. move up and down.

The rolling pressure roll 18 of the lifting platform IT is supported by a shaft 20 perpendicular to the screw shaft T, and is pressed against the lower surface of the screen 4 as shown in FIGS. 1 and 2 when the lifting platform IT is in the raised position. The screen 4 is pushed up from below, and the screen 4 is rolled while being pushed up by the movement of the moving table 11.

A clay cover 21 is attached to the upper outer side of the casing 11.

The upper lid 21 is movable up and down about a pivot 23 attached to the rear wall 22 of the casing 1, and is adapted to seal the upper edge opening of the casing 1 when it is laid down. This upper cover 21 is constructed by using a pinion gear 24 attached to a pivot shaft 23, a cylinder 25 provided on the base 9, and a rack rod 26 attached to the cylinder 25 so as to mesh with the pinion gear 24. move.

The upper lid 21 is provided with a vacuum chuck 2T at a position facing the movement range of the compaction roll 18 on the screen 4 when it is laid down.

This vacuum chuck 2T is composed of a hollow chamber 29 provided with a connection port 28 to a vacuum evacuation mechanism at the upper part, and a large number of through holes 30 penetrating from this hollow chamber 29 to the lower suction surface. The object to be adhered A is attracted to the lower surface of the adhesive by vacuum force. The bonding mechanism of the present invention has the above structure, and the bonding method will be explained next.

With the cylinder 25 extended and the upper lid 21 raised and opened, the moving table 11 at the initial forward end position and the cylinder 15 contracted, and the compaction roll 18 at the lowered position as shown by the solid line in FIG. 4, first open the upper lid. Place the adhered object A on the suction surface of the vacuum chuck 2T 21, operate the vacuum evacuation mechanism, and suction and fix the adhered object A to the upper lid 21 as shown in FIG. 3.Next, the screen 4
Temporarily fix the pasting material B at a predetermined position on the top.

As shown in FIG. 3, this pasting material B has an adhesive layer C and a protective paper D on one side, and after temporary attachment, the protective paper D is removed to expose the adhesive layer C on the upper side. In this state, the cylinder 25 contracts and the rack rod 26 and pinion gear 24
As a result, the earthen lid 21 is rotated and laid down, and as shown in FIGS. It overlaps with agent layer C.

When the upper cover 21 is horizontally laid down, the air inside the casing 1 is discharged under the control of the electric circuit, and when a certain degree of vacuum is reached, the cylinder 15 is extended and the compaction roll 18 is moved to the position shown by the dashed line in FIG. Go up and put the screen 4 on top lid 2
Push up towards 1.

When the compaction roll 18 reaches the raised position, the motor 10 rotates normally, and the rotation of the screw shaft T causes the movable table 11 to move leftward from the position shown in FIG. 1, that is, from the start end to the end end of the reciprocation. This movement prevents the rolling pressure roll 18 from rolling from the one-dot chain line to the two-dot chain line position in FIG. 4 with the screen 4 pushed up. Pressure is applied to the adhesive material B while moving it from one end to the other end. The above pressurization is carried out in a vacuum state, and the pressurization position moves sequentially from one end to the other.
The air bubbles interposed between the object A and the adhesive material B will be completely extruded and exhausted, and the object A and the adhesive material B will be pressure-bonded without air bubbles. Become.

When the moving table 11 reaches the forward end position and the lamination is completed, the cylinder 15 contracts and the compaction roll 18 goes to the lowered position as shown by the three-dot chain line in FIG. 4, and then the motor 10 rotates in the reverse direction. The moving table 11 returns to the backward motion starting position and stops.

When the moving table 11 stops, the vacuum chuck 2T in the casing 1 and in the upper lid 21 is returned to normal pressure by electrical control.

As a result, the product E, in which the adhered object A and the pasting material B are adhered, is placed on the screen 4. Next, the cylinder 25 is extended and the upper lid 21 is rotated to open the soil part of the casing 1, so that the product E on the screen 4 can be taken out. In addition, in the example, an example was shown in which the adhesive material A and the adhesive material B are fed manually, but for example, it may be incorporated into a conveyance line for the adhesive material and the adhesive material and adhesive material B that are automatically supplied can be fed together. They may be pasted, and the material to be pasted is not limited to the liquid crystal cell or the polarizing plate, and it is of course possible to paste other materials such as label pasting. As described above, according to the present invention, a screen is provided inside the casing that can be brought into a vacuum state, and a vacuum chuck is provided on the top lid that seals the casing.
A pressure roll is installed inside the casing to push up and pressurize the material sandwiched between the screen and the top cover from the bottom of the screen, so roll lamination can be performed in a vacuum and air bubbles between the laminated surfaces can be eliminated. Since it can be extruded and discharged, a complete lamination without the generation of bubbles can be obtained, and the quality of the laminated product can be greatly improved. In addition, since the material is set on the top cover and the screen and then bonded together, the alignment is perfect, there is no failure in the bonding work, and this method greatly contributes to improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view of the main parts showing the bonding mechanism of the present invention;
FIG. 2 is a longitudinal sectional side view of the main part of the same as above, FIG. 3 is an enlarged longitudinal sectional view of the main part with the material set on the upper surface, and FIG. 4 is a longitudinal sectional view of the same as shown in the laminated state. 1...Casing, 3,28...Connection port, 4...Screen, 1...Screw shaft, 8...Guide shaft, 10... Forward/reverse motor, 11... Moving table, 15, 25...
... Cylinder, 18 ... Pressure roll, 21.
・・・・Top lid, 21・・・Vacuum chuck.

Claims (1)

[Claims] 1 A compaction roll with a screen stretched inside the upper part and a connection port with a vacuum exhaust mechanism in the appropriate place, which can move up and down and horizontally, and which rolls by pressing the screen from the bottom when rising. is arranged, and a top cover that seals the upper opening of the casing when the casing is laid down is attached to the outside of the upper part of the casing so as to be movable up and down, and the top lid is provided with a vacuum chuck on a surface corresponding to the screen when it is laid down. Bubble-free vacuum bonding mechanism.