JPH0211282A - Joining device for platelike body - Google Patents

Abstract

PURPOSE:To efficiently produce a junction body having a uniform cell gap of a liquid crystal cell by placing a magnetic material plate on the surface of one of two pieces of platelike bodies to be joined, placing plural electromagnets on the other platelike body, and controlling a supply current. CONSTITUTION:An adhesive agent 12c of a thermosetting resin is applied to a prescribed position of a glass substrate 12a, a spacer 12d is spread uniformly onto the surface of a substrate 12a, and also, an optical hardening film 12a for tacking is applied to a prescribed position. Thereafter, in a state that a glass substrate 12b is superposed, said substrates are positioned between an electromagnet group 11 and a magnetic material plate 10. In a state that a current is allowed to flow equally to each electromagnet of the electromagnet group 11, a gap between both the glass substrates 12a, 12b is measured by an interference film thickness meter in each part of measuring use through-holes A-I. When a gap in the vicinity of I is narrower than the through-hole A, the gap is measured again by increasing a current which is allowed to flow to the electromagnet in the vicinity of the through-hole A. After a desired result is obtained, the optical hardening resin 12e is irradiated by a UV light, hardened and contained as it is in a cassette, and a rail resin 12c is hardened by heat.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a bonding device for bonding two plate-shaped bodies with a predetermined gap through a spacer, and particularly relates to a bonding device for bonding two plate-shaped bodies with a predetermined gap between them. It is effective when used.

2. Description of the Related Art For example, in the manufacturing process of a liquid crystal cell, it is necessary to bond two glass substrates with a predetermined distance apart to form an empty cell. Conventionally, as this empty cell manufacturing equipment, the fourth
The one shown in the figure is known. In FIG. 4, reference numeral 1 denotes a mounting table on which an empty liquid crystal cell 2 is placed. Said LCD empty cell/I
/2 is one glass substrate 12a of two glass substrates 12a and 12b on which a predetermined transparent electrode pattern is arranged in advance.
Then, as shown in FIG. 6(a), a sealing resin 12c for bonding the two substrates and a sealing resin 12e for temporary fixing are patterned and formed by screen printing and disbending, and on the other glass substrate 12b, As shown in FIG. 6(b), spacers 12d of a predetermined thickness are distributed to obtain a predetermined cell gap.

The two substrates are made to face each other, the transparent electrodes of both substrates are aligned, and the temporary fixing resin 12e is irradiated with light.
, 12b are temporarily joined.

Set both boards on the mounting table as shown in Figure 4,
Thereafter, high-pressure gas (such as N2) is blown into the air chamber 6 made of the elastically deformable material 3 from the outside through the vent hole γ. The air chamber 6 expands by blowing in this high-pressure gas, thereby bringing the glass substrates 12a and 12b into pressure contact, and in this state, main bonding is performed by applying heat to the sealing resin 12C. In addition, 4 is a device stand, 6 is a leak valve, 8 is a pressure gauge, and 9 is a holding nut.

Problems to be Solved by the Invention However, in the bonding apparatus having the above configuration, it is difficult to make the internal gap between both glass substrates uniform due to undulations and warpage of the glass substrates, variations in the thickness of the alignment film, and the like. Further, since a uniform internal gap cannot be obtained, there is a problem in that the two substrates 12a and 12b are misaligned during pressurized firing.

In view of the above-mentioned problems, the present invention provides a uniform cell gap of the liquid crystal cell and two upper and lower liquid crystal cells 12a.

The present invention provides a bonding device for preventing misalignment of the bonding device 12b with a high yield.

Means for Solving the Problems The device for joining plate-shaped bodies of the present invention arranges a magnetic plate on one surface of two plate-shaped bodies to be bonded, which are arranged to face each other with a spacer in between, and A device characterized in that a plurality of electromagnets are arranged opposite to the plate-like body, and the electric currents supplied to the plurality of electromagnets are controlled to press both plate-like bodies through the spacer. It is.

Effect: According to the above configuration, by adjusting the supply flow to each electromagnet, it is possible to partially change the pressing force between the two plate-like bodies to be joined. sled,
Even if there is slight deformation such as waviness 1, two plate-shaped bodies can be joined with a uniform gap.

EXAMPLE Hereinafter, an embodiment of the plate bonding apparatus of the present invention will be described with reference to the drawings, taking as an example the case where it is applied to a manufacturing process of a liquid crystal cell. FIG. 1 is a sectional view of a main part of a bonding device according to an embodiment of the present invention, and FIG. 2 is a plan sectional view thereof. In FIG. 1, 1Q is a magnetic plate υ such as an iron plate adjacent to the upper substrate J12a of the liquid crystal cell having the same configuration as the conventional one, and 11 is a group of electromagnets arranged in contact with the other glass substrate 12b. As shown in FIG. 3, this electromagnet group 11 consists of a plurality of coils/1z whose magnetic force can be adjusted by controlling the current supplied to each coil.
11a, 11b, 11c, 11d.=-. Further, through holes 14 for measuring the internal gap (cell gap) between the two glass substrates are formed in the iron plate 10 at positions A to B shown in FIG.

Next, the specific configuration and usage method will be explained.

As in the past, a thermosetting resin adhesive 12c is applied to a predetermined position on the glass substrate 12a, and spacers 12d having a thickness of 7.1 μm are uniformly spread over the surface of the substrate 12a as shown in FIG. , a photocured film 12θ for temporary fixing is applied to a predetermined position. Thereafter, it is placed between the electromagnet group 11 and the magnetic plate 10, as shown in FIG. 1, with the glass substrate 12b superimposed on it. Next, with a current uniformly flowing through each electromagnet of the electromagnet group 11,
At each location in (I), the gap (cell gap) between both glass substrates 12a and 12b is measured using an interference film pressure gauge.

The measurement results are shown in Table 1.

Table 1 Judging from these measurement results, compared to transparent A,
The spacing near the structures is becoming narrower. Therefore, the electromagnet 11a is located near the through hole A.

Increase the current flowing through 11b and 11C911d and measure the cell gap again. As a result, the results shown in Table 2 were obtained.

Table 2 After obtaining these measurement results, the photocurable resin 12e (8 points) was irradiated with 120 mW UV light for 60 seconds, cured, and then stored in a cassette. Cure for 2 hours. Table 3 shows the measurement results of cell gear and p of both the bonded and cured substrates.

Table 3 From the results in Table 3, the difference after temporary curing and after main curing is ±0,
It can be seen that it is within 0.01 μm. Note that S in this cell
The liquid crystal for TN was sealed and the optical and electrical characteristics were inspected. As a result, it was found to be a completely non-defective product, and the positions of both substrates were not shifted at all.

As described above, according to this embodiment, a uniform cell gap of a liquid crystal cell can be reliably obtained at a high yield.

It goes without saying that the temporary adhesive resin in this embodiment may be a thermoplastic resin having a soft point higher than the main curing temperature of the C/'J resin, in addition to the photocurable resin.

As described above, according to the present invention, even if there is a partial warp or undulation in both plate-shaped bodies to be joined, the pressing force applied to that part can be easily changed, so that uniform cells can be obtained. It is possible to efficiently create a bonded body having a gap.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a joining device for plate-like bodies according to an embodiment of the present invention, FIG. 2 is a plan cross-sectional view thereof, and FIG. B) is an ipsilateral sectional view,
FIG. 4 is a sectional view of a conventional bonding apparatus, and FIGS. 6(a) and 6(b) are plan views of liquid crystal glass substrates before bonding, respectively. 1o... Magnetic plate, 11... Electromagnet group,
12a. 12b... Plate-shaped body, 12d... Spacer, 14... Cell gear tube measurement through hole.

Claims (1)

[Claims] A magnetic plate is arranged on one side of two plate-like bodies to be joined which are arranged to face each other via a spacer, and a plurality of electromagnets are arranged opposite to the other plate-like body, 1. A joining device for plate-like bodies, characterized in that the plate-like bodies are pressed together through the spacer by controlling respective supply currents to electromagnets.