JP3257551B2 - Method for chamfering substrate, device for chamfering substrate and production of liquid crystal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a process for producing a liquid crystal display device which is capable of greatly ameliorating the processing variations and improving the efficiency and man-hours in a production process by rotating wheels by the side of the center of rotation and pressing two ridge line parts toward the side of the wheels, thereby chamfering the two ridge line parts. SOLUTION: The V-groove shaped diamond wheels 9 are arranged to face the ridge line parts 4 and 5 of the electrode terminal 3 of the liquid crystal display device and are so set as to maintain the positions of A and B. The angle of fine chamfering is made settable arbitrarily by the angle 10 of the V shape so as to be regulated to various angles. The diamond wheels 9 are so arranged that the distances A and B from the reference plane of the glass substrates 1 and 2 to the center of rotation of the diamond wheels 9 existing nearer both ends always have the relation A<B. This arrangement is extremely important to progress the processing gradually at the ridge line 4 and 5 of the electrode terminal 3 and to prevent the exertion of overload and cutting heat on the glass substrates 1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for chamfering a substrate. The present invention also relates to a substrate chamfering device. More specifically, the present invention relates to a method of manufacturing a liquid crystal display device, and more particularly to a step of chamfering a ridge line of a substrate used for the liquid crystal display device.

[0002]

2. Description of the Related Art A conventional method of manufacturing a liquid crystal display device is such that a connect pin, a heat seal, and an F pin are connected to an electrode terminal 3 of the liquid crystal display device composed of a glass substrate 1 and a glass substrate 2.
A PC etc. will be installed. At this time, the ridge line portion 4 of the substrate terminal portion of the electrode terminal 3 with which the conductive member such as the connect pin abuts,
5, the thread chamfering is performed. The reason for performing the thread chamfering is to further enhance the conductive reliability at the time of contact between the conductive member and the electrode terminal. As a method at this time, for example, as shown in FIGS. 8 and 9, a belt sander or the like is used, and abrasive grains placed on the belt sander are used.
A manufacturing method is known in which the edge lines 4, 5 are chamfered by handwork using an endless belt 14 made of a resin or the like.

[0003]

However, in the above-mentioned prior art, when the edge of the electrode terminal board is chamfered by a thread using a belt sander or the like, the chamfering amount and angle are remarkable. There is a problem that it shows variation, is unstable in quality, is inefficient due to handwork processing, and consumes considerable time in man-hours. Therefore, the present invention has been made in view of such a problem,
As a method of chamfering the ridge portion of the electrode terminal substrate, a continuous yarn chamfering process is performed by using a plurality of diamond wheels, thereby significantly improving processing variations, efficiency, and man-hours in a manufacturing process. It is intended to provide a manufacturing method.

[0004]

According to the method for chamfering a substrate of the present invention, a substrate having two ridges at an end is conveyed along the direction of the ridges, and a plurality of wheels having concave sides are formed on the sides. A chamfering method for a substrate, in which the two ridge lines are chamfered by sequentially pressing the two ridge lines on the substrate. It is characterized by becoming shorter along the direction. The substrate chamfering apparatus according to the present invention includes: means for transporting a substrate having two ridges at an end along the direction of the ridges; and a plurality of wheels whose side of the rotation center is depressed. The plurality of wheels are arranged such that a distance between a center of rotation and the ridge line chamfered by each wheel becomes shorter along a direction in which the substrate is transported. In a method for manufacturing a liquid crystal device according to the present invention, in the method for manufacturing a liquid crystal device, a pair of substrates are arranged to face each other, and an electrode terminal is formed near a ridge line of at least one of the substrates. Conveying along the direction of, having a step of chamfering the ridge line by sequentially pressing the ridge line to the side of the plurality of wheels whose side of the rotation center is depressed, the rotation center of each wheel and The distance between the ridge line chamfered by each wheel is reduced along the direction in which the substrate is transported.

[0005]

[Embodiment 1] The details of the present invention will be described below based on an embodiment. 1, 2 and 3 are external views showing a method for manufacturing a liquid crystal display device according to the present embodiment.
First, the manufacturing method will be described. A plurality of disc-shaped diamond wheels 6 are integrated with each ridge of the ridges 4 and 5 of the electrode terminal 3 of the liquid crystal display device composed of the glass substrate 1 and the glass substrate 2. A diamond wheel 7 is provided. The rotation direction of the diamond wheels 6, 7 is desirably rotated in the directions of the arrows shown in the drawings. Then, the liquid crystal display device composed of the glass substrates 1 and 2 is transported by a transport belt or the like in the direction of the arrow. At the time of the transfer, the diamond terminals 6 and 7 are pressed against the ridges 4 and 5 of the electrode terminal 3 so that stress is evenly distributed. After the liquid crystal display device has passed through the diamond wheel portion, the ridge portions 4 and 5 of the electrode terminal 3 are both
Yarn chamfering is performed. The features of the diamond wheel include the following. First, the distances A and B to the rotation centers of the diamond wheels located at both ends from the reference plane of the glass substrate are arranged so as to always have a relationship of A <B. (See FIG. 1) This is extremely important in order to prevent the overload and the cutting heat from being applied to the glass substrate by gradually processing the ridges 4 and 5 of the electrode terminals 3. Table 1 shows the cutting test results. Diamond wheel type, metal bond method, mesh # 700, degree of concentration 75, medium hardness use a diamond wheel, the yarn chamfering was carried out under the conditions of Table 1, the cutting amount per wheel and cutting quality The relationship is comprehensively determined. It can be said that the state of the cut surface is most preferable when the cutting amount = C0.06. In the case of cutting to C0.20, there is a high possibility that a defect will occur due to parameters such as surface roughness, micro cracks, and chipping. Therefore, it can be understood that the quality of the yarn chamfering can be maintained by controlling the cutting amount up to C0.08.

[0006]

[Table 1] Note that the above data is for the case of dry machining, and the data for wet machining (with water injection treatment) is about 2 to 3 times that of dry machining, and can maintain the same level even after cutting. However, the micro-crack means that the surface of the glass substrate on which the yarn chamfering is performed is 200 to 50 mm from the surface.
It refers to a glass crack of about 0 μm. The micro cracks were formed by inserting a connect pin and heat sealing.
It is a parameter that is highly dangerous as a factor that rapidly progresses due to stress or thermal shock applied when the PC is crimped, and thus induces poor conduction of the electrode terminals. Second, FIG.
(A) and (b), the yarn chamfering angle can be changed. This is because θ1 can be increased by reducing the distance 8 between the wheel axes in FIG. 1, and θ2 can be reduced by increasing the distance 8 between the wheel axes. Therefore, the yarn chamfering angle and amount (variable cutting amount) can be freely selected and processed, and it is possible to cope with a wide range of applications. For example, in the case of a liquid crystal display device using a connect pin, θ is 45 ± 20 °, which is also obtained from experimental results. Regarding the presence or absence of the thread chamfering of the ridge portions 4 and 5, any response can be made. In the experiment of Table 1, 5
Wheels / axle are selected as the same mesh.
This depends on the required surface accuracy of the chamfered surface.
If the mesh size is reduced to 1000, cracks and surface accuracy can be significantly improved. In order to realize high-speed processing, it can be realized by miniaturizing each of # 300 × 2 sheets + # 700 × 3 sheets or # 100 / # 100 to # 800. It is obtained from the results. Embodiment 2 Embodiment 2 will be described. 5 and 6 are external views showing a method for manufacturing a liquid crystal display device according to this embodiment. Using a V-groove-shaped diamond wheel, the V-groove-shaped diamond wheel 9 is arranged in the same manner as in Example 1 at the ridgelines 4 and 5 of the electrode terminals 3 of the liquid crystal display device,
Set so that the positions of A and B are maintained. As the wheel, a diamond wheel having a plurality of V-grooves is arranged, and the direction of wheel rotation is the direction of the arrow. (See FIG. 5) The cutting method and effect are the same as in the previous embodiment, and continuous yarn chamfering can be performed. As for the angle of the yarn chamfering, it goes without saying that the narrowing and widening can be arbitrarily set by the V-shaped angle 10. Third Embodiment A third embodiment will be described. FIG. 7 is a perspective view illustrating the manufacturing method in the present embodiment. In this embodiment,
By using the cylindrical diamond wheel 11, the cylindrical diamond wheels 11, 12 are arranged as shown in the figure with respect to the ridge lines 4, 5 of the electrode terminal 3, and rotation is performed in the direction of the arrow to apply thread to the ridge lines 4, 5. It is to be chamfered. The circular diamond wheel 11,
12 has a plurality of wheels facing each other, and is capable of continuous processing. However, when the liquid crystal display device is moved in the direction of the arrow, it is desirable that the wheel cutting amounts with respect to the ridge portions 4 and 5 of the wheels are the same as in the first embodiment. The feature of the wheel is that a hole 13 is opened at the center of the cylinder, and there is virtually no wheel stop. Conversely, when the hole 13 does not exist, a large load is applied to the front ridge portions 4 and 5, and there is a concern that the glass may be damaged. Therefore, according to the above method, the same thread chamfering state as in the above embodiment can be maintained.

[0007]

As described above, according to the present invention, the two ridges are chamfered by rotating the wheel whose side is depressed and pressing the two ridges against the sides of the wheel. Therefore, two ridge lines of the substrate can be chamfered at one time. Also,
Since the distance between the center of rotation of each wheel and the ridge line chamfered by each wheel decreases along the direction in which the substrate is conveyed, the chamfering process gradually proceeds. Therefore, it is possible to prevent the heat generated by overload or cutting from being applied to the substrate. In the case where the substrate chamfering method of the present invention is used for a method of manufacturing a liquid crystal device, the glass substrate can be prevented from being damaged during the chamfering process as much as possible, thereby improving the manufacturing yield.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

FIG. 2 is a schematic diagram showing one embodiment of the present invention.

FIG. 3 is a schematic view showing one embodiment of the present invention.

FIGS. 4A and 4B are views showing a liquid crystal display device after processing in the embodiment.

FIG. 5 is a schematic view showing a manufacturing method in the present embodiment.

FIG. 6 is a schematic view showing a manufacturing method in the present embodiment.

FIG. 7 is a schematic view showing a manufacturing method according to another embodiment.

FIG. 8 is a schematic view showing a conventional manufacturing method.

FIG. 9 is a schematic view showing a conventional manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Glass substrate 3 Electrode terminal 4 Ridge part 5 Ridge part 6 Diamond wheel 7 Diamond wheel 8 Wheel axis 9 V-groove diamond wheel 10 V shape angle 11 Cylindrical diamond wheel 12 Cylindrical diamond wheel 13 Hole 14 Endless belt

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G02F 1/1333 G02F 1/13 101 G09F 9/00-9/46

Claims (3)

(57) [Claims] 1. A substrate having two ridges at an end thereof is conveyed along the direction of the ridges, and the two ridges are sequentially pressed against the sides of a plurality of wheels whose sides are depressed at the center of rotation. A method of chamfering a substrate that chamfers the two ridges, wherein a distance between a rotation center of each of the wheels and the ridges chamfered by each of the wheels decreases in a direction in which the substrate is conveyed. Characteristic substrate chamfering method. 2. A means for transporting a substrate having two ridges at an end thereof along the direction of the ridges, a plurality of wheels having a side with a rotation center depressed, wherein the rotation center of each of the wheels and the rotation center The substrate chamfering device, wherein the plurality of wheels are arranged such that a distance between the ridge line chamfered by each wheel is shortened along a direction in which the substrate is conveyed. 3. A method of manufacturing a liquid crystal device, comprising: a pair of substrates arranged opposite to each other, wherein an electrode terminal is formed near a ridge line of at least one of the substrates. Conveying, comprising a step of chamfering the ridge line by sequentially pressing the ridge line against the side of the plurality of wheels having a depressed side of the rotation center, and chamfering the rotation center of each wheel and each wheel. The method of manufacturing a liquid crystal device according to claim 1, wherein a distance from the ridge line decreases along a direction in which the substrate is transported.