JPH06123865A - Production equipment for liquid crystal panel - Google Patents

Abstract

PURPOSE:To provide the production equipment for a liquid crystal panel capable of sticking two sheets of glass substrates for the liquid crystal panel to be adhered to each other by a UV-curing resin in such a manner that both front and rear surfaces are as parallel as possible. CONSTITUTION:This production equipment has a pressurizing plate mechanism 23, a pressure receiving plate mechanism 37 which pressurizes two sheets of glass substrates interposing the UV-curing resin therebetween cooperatively with this pressurizing plate mechanism 23, three pieces of load cells 19, 19, 19 which are so arranged as to be positioned at the respective vertexes of one triangle viewed in plant and support one of the pressurizing plate mechanism 23 and the pressure receiving plate mechanism 37, heating means 27, 39 which heat the parts near the surfaces of the pressurizing plate mechanism 23 and the pressure receiving plate mechanism 37 to a prescribed temp. and a UV generating mechanism 44 which is disposed oscillatably in either of the pressurizing plate mechanism 23 and the pressure receiving plate mechanism 37 and irradiates the UV-curing resin with UV rays.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to equipment suitable for manufacturing a liquid crystal panel constituting an empty liquid crystal cell.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal panel, a thermosetting resin is applied by printing onto the inner surfaces of two upper and lower glass substrates having transparent electrodes attached to the inner surfaces thereof, and they are superposed on each other. However, the thermosetting resin is cured by temporary heating and main heating, and the two glass substrates are attached to each other with the thermosetting resin, so that the two glass substrates and the thermosetting resin are bonded together. Manufactured to form one or more empty liquid crystal cells. However, in such a conventional manufacturing method, the process is complicated, and it takes about 5 to 10 hours from the heating to the completion of cooling, and it is necessary to provide a large-scale heating furnace in the clean room due to heat. There was a problem that equipment costs increased.

[0003]

Therefore, an ultraviolet curable resin is used instead of the thermosetting resin, and the ultraviolet curable resin is irradiated with ultraviolet rays to be cured by a chemical reaction to bond the two glass substrates together. Is proposed,
In this manufacturing method, the ultraviolet rays partially hit the glass substrate, causing thermal deformation, which causes the glass substrate to lose its parallelism.
New problems such as inaccurate liquid crystal cells of liquid crystal panels are occurring. In addition, the displacement of the transparent electrodes on the upper and lower two glass substrates needs to be within plus or minus 2 μm. Conventionally, the pressure applied when the two glass substrates are bonded together depends on the diaphragm under hydraulic pressure. Therefore, there is also a problem that when the pressure is applied, it largely deviates to 50 to 100 μm. The present invention has been made in view of the above circumstances. When bonding two glass substrates using an ultraviolet curable resin, the entire glass substrate is irradiated with ultraviolet rays almost uniformly and the two bonded glass substrates are bonded together. An object of the present invention is to provide a liquid crystal panel manufacturing facility in which the parallelism of the glass substrate is improved as much as possible.

[0004]

In order to achieve the above object, the liquid crystal panel manufacturing equipment of the present invention comprises upper and lower two glass substrates having transparent electrodes attached to their inner surfaces and a predetermined gap between them. Provide and bond with UV curable resin,
Therefore, there is provided a facility for manufacturing a liquid crystal panel configured to form at least one or more empty liquid crystal cells, which comprises a pressure plate mechanism; and the two glass substrates interposing an ultraviolet curing resin, the pressure plate mechanism. A pressure receiving plate mechanism that cooperates with the pressure receiving plate mechanism; and three load cells that are disposed so as to be located at the respective vertices of a triangle in plan view and that support one of the pressure plate mechanism and the pressure receiving plate mechanism. Heating means for heating the vicinity of the surfaces of the pressure plate mechanism and the pressure receiving plate mechanism to a predetermined temperature; and one of the pressure plate mechanism and the pressure receiving plate mechanism being swingably disposed to irradiate the ultraviolet resin with ultraviolet rays. An ultraviolet ray generating mechanism, wherein the pressure plate mechanism and the pressure receiving plate mechanism interpose the ultraviolet resin.
The load cell detects the parallelism between the two glass substrates while pressing the two glass substrates.

[0005]

The operation of the thus constructed manufacturing equipment will be described. Two glass substrates having transparent electrodes attached to their inner surfaces and coated with an ultraviolet curable resin are provided between the pressure plate mechanism and the pressure plate mechanism. After setting, while heating the vicinity of the surfaces of the pressure plate mechanism and the pressure receiving plate mechanism to a predetermined temperature by the heating means, irradiating the glass substrate with ultraviolet rays while swinging the ultraviolet ray generation mechanism, and further through three load cells. The glass substrate or the like is pressed by the pressure plate mechanism and the pressure receiving plate mechanism while detecting the parallelism of the two lath substrates. As a result, the two glass substrates can be bonded to each other via the ultraviolet curable resin.

[0006]

EXAMPLES Examples will be described in detail with reference to FIGS. As shown in FIG. 1, which is a partial sectional front view showing an embodiment of the present invention, an elevating device 2 for elevating an elevating frame 17, which will be described later, is installed in the central portion of the base 1. In the device 2, a hollow rotating shaft 3 oriented in the up-down direction is rotatably mounted on a casing 5 via a bearing 4, a nut 6 having a ball inside is fitted in the hollow rotating shaft 3, and the nut 6 is mounted on the nut 6. A screw shaft 7 is screwed, a belt pulley 8 is mounted on the lower end of the hollow rotary shaft 3 supported by a bearing 9, and a connecting member 10 is fitted on the upper end of the screw shaft 7.
Further, on the right side of the hollow rotary shaft 3 or the like, the downward facing speed reducer 1 is provided.
A servo motor 12 with a unit 1 is provided so as to be supported by a casing 5, and an output shaft of the servo motor 12 is provided with a belt pulley 8 and an endless belt 14 through which the belt pulley 8 is provided.
The screw shaft 7 is moved up and down by the forward and reverse rotations of the servo motor 12.

Guide rods 15, 15 are provided upright at the four corners of the base 1, and an elevating frame 17 is vertically slidable on the guide rods 15, 15 via linear bearings 18, 18. The elevating frame 17 has a connecting member 10 fixed to the central portion of the lower surface thereof. Further, three load cells 19, 19, 19 are arranged and mounted on the elevating frame 17 so as to be located at respective vertices of one equilateral triangle in plan view. 19, 19, 19 are electrically connected to a controller 20 composed of a microcomputer via an amplifier 21 and an A / D converter 22, and in the controller 20, three load cells 19, 19, The analog signal of the load acting on 19 is converted into a digital signal via the A / D converter 22 and input, whereby the loads applied to the three points are measured and the maximum values of the loads at these three points are measured. And the minimum value is calculated. If the calculated difference is larger than the preset value, the parallelism of the two lath boards coated with UV-curing resin on the inner surface It will be is detected that has not become the predetermined ones.

Further, these three load cells 19, 1
A pressure plate mechanism 23 is installed between the upper ends of 9 and 19, and in the pressure plate mechanism 23, as shown in FIG. 1, a rectangular ceramic pressure plate body 24 and a rectangular support plate 25 are provided. The heating means 27 and the heat insulating member 40 are provided between the pressure plate body 24 and the support plate 25, and are provided so as to face each other with a predetermined space therebetween via the intermediary member 26 and face each other.

Further, in the heating means 27, as shown in FIG. 2 which is a schematic view, a thermocouple 29 is embedded near the surface of the pressure plate body 24 and detects the temperature near the surface.
And an electric heater pool 3 for heating the pressure plate body 24.
0 is provided, a thermocouple 32 for detecting the temperature near the electric heater 31 of the electric heater plate 30 is also embedded in the electric heater plate 30, and the thermocouple 2
9 and 32 are electrically connected to the input terminals of the pressure plate body temperature controller 33 and the input terminals of the electric heater plate temperature controller 34, respectively, and the output terminal of the pressure plate body temperature controller 33 is an electrical terminal. It is electrically connected to the input terminal of the heater plate temperature controller 34, and the output terminal of the electric heater plate temperature controller 34 is electrically connected to the current switching means 35. The numeral 35 is adapted to be opened and closed by a signal from the electric heater plate temperature controller 34. The electric heater 31 is electrically connected to a power source 38 via a power regulator 36 and a current switching means 35.

Therefore, in the pressure plate mechanism 23,
By supplying electric power to the electric heater 31, the pressure plate body 24 is heated via the electric heater plate 30, and as shown in FIG. 3, which is a block diagram showing the electrical configuration of the heating means 27, the electric heater at this time is heated. The temperature of the plate 30 is measured by the thermocouple 29, and the temperature controller 33 for the pressure plate is measured.
In the temperature regulator 33 for the pressure plate, the PID is calculated from the difference between this measured value and the preset value.
A calculation is performed and the value for heating the pressure plate body 24 to the required temperature is calculated in the form of a percentage, followed by this first
The calculated value is input to the electric heater plate temperature controller 34, and a value for heating the electric heater plate 30 to a target value is calculated by a preset calculation formula. For example, the calculated value of the PID calculation is 0. 180% when
⁰ C, 200 at the time of 190 ⁰ C, 100% at the time of 50%
Calculated as ⁰ C.

Next, PID calculation is performed from the second calculated value and the difference in temperature of the electric heater plate 30 measured by the thermocouple 32, and the electric heater plate 3
The value for heating 0 to the required temperature is likewise calculated in the form of a percentage, and on the basis of this third calculated value the current switching means 35
Is opened and closed. Thereby, electric power is supplied to the electric heater 31 for a required time, and the electric heater plate 30 can heat the vicinity of the surface of the pressure plate body 24 to a desired temperature. Further, as shown in FIG. 1, the guide rod 1
A pressure receiving plate mechanism 37 is installed between the upper ends of the pressure plates 5 and 15 so as to face the pressure plate mechanism 23. In the pressure receiving plate mechanism 37, a ceiling frame 16 is installed between the upper ends of the guide rods 15 and 15. An ultraviolet ray transmitting pressure receiving plate body 41 is attached to the lower surface, and heating means 39 is provided in the ceiling frame 16.
And the heating means 39 is the heating means 27.
Similarly to the electric heater plate 27 having the built-in electric heater 43, and a thermocouple (not shown) embedded near the surface of the pressure receiving plate main body 41 for detecting the temperature near the surface, and a controller is provided. I have it. Further, as shown in FIG. 1, an ultraviolet ray generating mechanism 44 is mounted on the upper surface of the pressure receiving plate mechanism 37 so as to be swingable right and left via a swinging mechanism 45.

Next, the operation of adhering the transparent electrodes on the inner surfaces and adhering the two glass substrates printed with the ultraviolet curable resin to each other using the equipment thus constructed will be described. As shown in FIG. 1, with the elevating frame 17 lowered, the two glass substrates are set on the pressure plate body 24 of the pressure plate mechanism 23, and then the equipment is started. Then, the servomotor 12 is driven in the normal direction, and electric power is supplied to the electric heaters 31, 43, so that the electric heater plates 30, 42 cause the pressure plate body 24 of the pressure plate mechanism 23 and the pressure plate body of the pressure plate mechanism 37 to operate. 41 is heated, and further, the ultraviolet ray generation mechanism 44 moves the swing mechanism 45.
The glass substrate is irradiated with ultraviolet rays while being swung in a substantially horizontal direction. As a result, the ultraviolet curable resin is heated by the heat from the pressure plate body 24 and the pressure receiving plate body 41, and at the same time, the ultraviolet curable resin 43 is irradiated with the ultraviolet ray from the rocking ultraviolet ray generation mechanism 43, so that the ultraviolet curable resin is uniformly chemically treated. While reacting and curing, the pressure applied by the pressure plate body 24 and the pressure receiving plate body 41 and the parallelism of the two glass substrates are detected by the three load cells 19, 19, 19,
The two glass substrates and the ultraviolet curable resin are pressed.

Thus pressurized, the load cells 19, 1
When 9 and 19 detect the target value, the servo motor 12 is stopped. When the load cells 19, 19 and 19 do not detect the target value even after pressurizing for a predetermined time, the glass substrate or the like is treated as a defective product, and then the ultraviolet ray generating mechanism 44 swings and the electric heater 31. , 43 ...
The power supply to the ultraviolet ray generation mechanism 44 is stopped. After that, the servo motor 12 is driven in the reverse direction and the pressure plate mechanism 23
Are lowered via the lifting frame 17. This allows
The liquid crystal panel, which is adhered with the ultraviolet curable resin to form a predetermined parallelism, can be taken out from the pressure plate body 24.

In the above embodiment, the pressure plate mechanism 23
Is provided below, the pressure plate mechanism 23 and the pressure receiving plate mechanism 37 are reversely arranged, and the pressure plate mechanism 23 is provided above and the pressure receiving plate mechanism 37 is provided below. Even if the plate mechanism 37 or the like is rotated by 90 degrees, the same effect can be obtained. Further, in the above embodiment, the ultraviolet ray generating mechanism 44 is arranged on the pressure receiving plate mechanism 37 side, but it is needless to say that it may be arranged on the pressure plate mechanism 23 side. Further, in the above embodiment, the pressure plate mechanism 2
Although the 3 side is supported by the load cells 19, 19, 19, the pressure receiving plate mechanism 37 side may be supported. Further, in the above embodiment, the three load cells 19,
19 and 19 are arranged so as to be located at the vertices of one equilateral triangle in plan view, but the equilateral triangle may be an appropriate triangle. Further, in the above embodiment, the lifting device 2
The ball screw mechanism driven by the servo motor 11 is used, but the device is not limited to this structure, and it goes without saying that various pressing devices such as a hydraulic cylinder may be used. Further, the heating means 27, 39 are provided in the pressure plate body 24.
And any mechanism may be used as long as it can heat the pressure receiving plate body 41 to a predetermined temperature. Furthermore,
As the temperature sensor, a resistance temperature detector may be used instead of the thermocouples 29 and 32.

[0015]

As is apparent from the above description, in the present invention, the pressure plate mechanism and the pressure receiving plate mechanism are provided with heating means, and the ultraviolet ray generating mechanism can be swung on at least one side of the pressure plate mechanism and the pressure receiving plate mechanism. Since it is disposed in, the entire ultraviolet curable resin interposed between the two glass substrates can be almost uniformly cured and used as an adhesive. Furthermore, one of the pressure plate mechanism and the pressure receiving plate mechanism can be used. Since it is supported by the load cells arranged so as to be located at the vertices of one triangle when seen in a plan view, it is possible to press the two glass substrates so as to increase the parallelism between the upper and lower surfaces thereof as much as possible. It has excellent effects such as being able to do it.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

FIG. 2 is a schematic view showing an embodiment of heating means which is one of the constituent elements of the present invention.

FIG. 3 is a block diagram showing an electrical configuration of an embodiment of heating means which is one of the constituent elements of the present invention.

[Explanation of symbols]

 19 load cell 23 pressure plate mechanism 27 39 heating means 37 pressure receiving plate mechanism 44 ultraviolet ray generation mechanism

Claims (1)

[Claims] 1. An upper and lower two glass substrates each having a transparent electrode attached to each inner surface thereof are adhered to each other with an ultraviolet curable resin with a predetermined gap provided therebetween, and thus at least 1
1. A facility for manufacturing a liquid crystal panel configured to form at least one empty liquid crystal cell, comprising: a pressure plate mechanism 23; and the two glass substrates with an ultraviolet curable resin interposed therebetween in cooperation with the pressure plate mechanism 23. A pressure receiving plate mechanism 37 that works and pressurizes; three load cells 19 that are arranged so as to be located at the respective vertices of one triangle in plan view and that support one of the pressure plate mechanism 23 and the pressure receiving plate mechanism 37. , 19, 19; heating means 27, 39 for heating the vicinity of the surfaces of the pressure plate mechanism 23 and the pressure receiving plate mechanism 37 to a predetermined temperature; and swinging to one of the pressure plate mechanism 23 and the pressure receiving plate mechanism 37. An ultraviolet ray generating mechanism 44 for irradiating the ultraviolet ray resin with ultraviolet rays, and the pressure plate mechanism 23 and the pressure receiving plate mechanism 37 interpose the ultraviolet ray resin between the two glass substrates. When you are pressurized, the load cell 19,19,19 manufacturing facility of the liquid crystal panel and detecting the parallelism of the two glass substrates.