JP2003212579A - Cross-scribing method of hard brittle plate and apparatus thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize occurrence of a defective product on splitting in a cross- scribing method of a hard brittle plate such as a glass plate and a ceramic plate is split along splitting lines intersecting each other, and a apparatus thereof by forming of an optimum crack and preventing of skipping of a line. <P>SOLUTION: A scribe line 17 of a first direction is cut and, thereafter, a scribe line of a second direction which intersects the scribe line 17 of the first direction is cut in the splitting of the hard brittle plate by means of the cross- scribing break. When a cutter 6 intersects the scribe line 17 of the first direction which is cut already, a cutting depth or/and a cutting force of the cutter 6 is temporarily made large. The scribing condition other than the case that the cutter 6 intersects the scribe line 17 of the first direction is set so as to satisfy such a requirement that horizontal crack is minimized and vertical crack of a necessary depth is obtained. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention engraves a scribe line (scratch groove) on the surface of a hard brittle plate such as a glass plate or a ceramic plate in order to divide the hard brittle plate along a predetermined dividing line. And a cross scribing method and device for sequentially engraving a scribe line in a first direction and a scribe line in a second direction intersecting the scribe line on a hard brittle plate.

[0002]

2. Description of the Related Art A display device such as a liquid crystal using a glass substrate is manufactured by forming a large number of display elements in a matrix on a large glass substrate and then dividing the display elements into rows and columns. As a method of dividing the glass substrate in the vertical and horizontal directions, a scribe line is engraved vertically and horizontally by pressing a needle cutter or a rotating cutter on the glass substrate and running, and then a shock or bending stress is applied to break along the scribe line. The method of doing has been used for a long time. When dividing one glass plate at a plurality of vertical and horizontal positions, a method of first engraving vertical and horizontal scribe lines and then breaking is used from the viewpoint of workability.

For example, a display panel such as a liquid crystal is
Since the two glass substrates are combined, first the vertical and horizontal scribe lines are engraved on one glass substrate, the one substrate is broken, and then the vertical and horizontal scribe lines are engraved on the other glass substrate. Then, the glass plate is divided by breaking along one of the scribe lines to form a strip-shaped substrate, and then along the other scribe line to obtain a rectangular display panel of a predetermined size. Is being done.

When the hard brittle plate is divided by the scribe-break, a cutter is pressed against the surface of the hard brittle plate to cause the glass plate to run, and cracks are generated in the glass plate. It is to cut along. The cracks generated in the scribing process include vertical cracks that grow in the plate thickness direction and horizontal cracks that grow in the plane direction. Vertical cracks are effective at the time of break, while horizontal cracks cause defective products due to chipping and cracking at the peripheral edge. Therefore, in the scribing process, it is important to generate vertical cracks of a desired depth without generating horizontal cracks as much as possible.

Therefore, the scribing device is provided with a cutter elevating device and a pressurizing device, and the cutting depth and cutting force of the cutter can be adjusted according to the material and thickness of the hard brittle plate to be divided. As much as possible, horizontal cracks are not generated, but vertical cracks of the required depth are generated. In other words, in the scribing process, to prevent chipping and potential cracks that cause defective products,
The cutting depth and cutting force of the cutter are carefully adjusted.

Especially, in liquid crystal panels for mobile phones, PHSs, portable personal computers, etc., if there is a potential crack or the like due to an external force acting during carrying or an impact when dropped, an accident occurs in which the panel breaks from the part. .

Further, in the cross scribe, when engraving the scribe line in the second direction, there is a problem that a jump line is generated at a cross point which crosses the scribe line in the first direction which is already engraved. That is, when the cutter crosses the scribe line in the first direction that is already engraved, it gives an impact to the engraving line, and the cutter receives an impact reaction force from the engraving line, causing a large horizontal crack at the cross point. It may occur or the cutter may momentarily float up and a vertical crack of a desired depth may not be formed. When such jump lines occur, chipping or distortion of dividing lines occurs at the corners in the break process.

Therefore, in order to avoid this phenomenon, when the operator engraves the scribe line in the second direction which intersects with the scribe line in the first direction which has already been engraved, the operator applies the pressure to the cutter first. The scribe line in the direction 1 was set to a value larger than the pressure applied when engraving so that no jump line was generated at the cross point.

[0009]

However, as described above, the cutting depth and cutting force of the cutter when engraving the scribe line are such that vertical cracks of a required depth are generated without causing horizontal cracks as much as possible. Where it should be set to meet the conditions,
When the scribe line of the cutter when engraving the scribe line in the second direction is set to be larger than that when engraving the scribe line in the first direction, it means that the scribe line in the first direction is engraved. It is said that it is necessary to deviate either or both of the applied pressure when installing and the applied pressure when engraving the scribe line in the second direction (when the difference between the applied pressures is set separately). That is.

Therefore, in the conventional method as described above, the engraving conditions of the scribe lines in the first and second directions intersecting with each other cannot be set to the optimum condition for crack generation, and at least one of the scribe lines is not scribed. Will be engraved under conditions that deviate from the proper values, and the requirement to minimize the occurrence of defective products in the break process cannot be achieved.

According to the present invention, in the division of the hard brittle plate along the dividing lines intersecting each other by the scribe-break, optimum crack formation in the scribing process,
An object of the present invention is to minimize the occurrence of defective products at the time of dividing a hard brittle plate accompanied by cross scribing by obtaining a technical means capable of realizing prevention of flying lines at the time of cross scribing.

[0012]

According to the present invention, in dividing a hard brittle plate by cross scribe-break,
After engraving the scribe line 17 in the first direction and engraving the scribe line 18 in the second direction that intersects with the scribe line 17 in the first direction, the cutter 6 is already engraved in the scribe line 1 in the first direction.
The above problem is solved by temporarily increasing the cutting depth and / or the cutting force of the cutter 6 when the cutter 7 is traversed.

The cutter 6 has a scribe line 17 in the first direction.
The scribe conditions, except when traversing, are set to meet the requirement of minimizing horizontal cracks to obtain the required depth of vertical cracks. Therefore, when the physical properties of the hard brittle plate have directionality, or when the cutter to be used is different when engraving the scribe line in the first direction and when engraving the scribe line in the second direction. Except for the above, the cutting depth and cutting force of the cutter 6 are the same when engraving the scribe line in the first direction and engraving the scribe line in the second direction.

The cutting depth of the cutter mentioned here is the difference between the height of the tip of the cutter and the height of the surface of the hard brittle plate when the reaction force from the hard brittle plate 1 is released. The scribe line needs to be engraved from one end of the hard brittle plate 1 to the other,
Therefore, as shown in FIG. 3, with the cutter 6 placed on the outside of the hard brittle plate 1, the cutting edge of the cutter 6 is set to the position of the cutting depth indicated by L1 in the drawing, and the downward pressing force is applied to the cutter 6. The traveling of the cutter 6 is started in the state of being added. The cutter 6 has a cutting depth L when it abuts on the edge of the hard brittle plate 1.
It is pushed up by 1 to start engraving the scribe line.
When the rotary cutter is used, the cutting depth L1 is 0.
It is about 15 mm, and if the depth of cut is increased, the horizontal crack becomes large at the starting point of the scribe line, and if it is reduced, scribe line imperfections occur due to the undulation of the surface of the hard brittle plate. The cutting depth and the cutting force are applied by the lifting device 9 and the pressurizing device 10 which are interposed between the traveling table 5 for traveling the cutter 6 and the cutter 6.

The increase in the cutting depth or / and the cutting force when the cutter passes the cross point 20 cancels out the instantaneous increase in the reaction force acting on the cutter 6 from the scribe line 17 in the first direction. Granted to. The section to be given is preferably as short as possible. Cross point 20
It is considered that the fluctuation of the reaction force when passing through is instantaneous, so the increase in the cutting depth or / and the cutting force may be instantaneous if the timing can be accurately matched. . However, since an error and a control delay usually occur, it is practical to set a certain interval for safety and increase the cutting depth and cutting force.

It is considered that either of the cutting depth and the cutting force may be increased, but in the experiments conducted by the inventors, it was found that increasing the cutting depth increased the ratio of horizontal cracks to the increase of vertical cracks. Was smaller and more effective. Since the cutting force is generally applied via fluid, increasing the cutting depth by mechanical means causes less delay in response and pulsation, and it is possible to effectively counteract due to momentary reaction force fluctuations. It is thought that there is.

The scribing apparatus of the present invention includes a table 3 on which the hard and brittle plate 1 is placed, a traveling table 5 traveling in a plane parallel to the surface of the table, an elevating device 7 and a pressure device on the traveling table. A cutter 6 mounted via 10 and a controller 16, the controller including a cutting depth setting means for setting an ascending / descending position of the elevating device and a notch for setting a pressing force of the pressing device. Force setting means, increase value setting means,
A second section which includes an increasing section setting means, a position setting means for the scribe line 17 in the first direction, and a traveling position detecting means for the cutter 6, and which intersects with the scribe line 17 in the first direction after engraving the scribe line 17. When engraving the scribe line 18 in the direction of the above, when the cutter 6 reaches the set position of the scribe line 17 in the first direction or the position immediately before that, the set section, the lifting device, It is characterized in that a lowering command based on the set increase value is given and / or a pressurizing command based on the set increase value is given to the pressure device.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 3 denotes a table of a scribing device, which can be moved and positioned in the left-right direction in the figure and can be rotated around a pivot axis in the vertical direction (vertical direction in the figure) about a table center. The glass plate 1 to be divided is placed on the table by vacuum suction or the like. Reference numeral 2 is a traveling guide mounted in parallel with the upper surface of the table 3 and extending in a direction perpendicular to the plane of the drawing, and 4 is a ball screw mounted in parallel with the traveling guide 2 and rotationally driven by a traveling motor (not shown). Reference numeral 5 denotes a traveling table on which the cutter 6 travels. Reference numeral 7 denotes a lifting screw that is vertically supported by the traveling table 5 and is rotationally driven in the forward and reverse directions by the servo motor 8. Reference numeral 9 denotes an elevating table which is guided by the traveling table 5 so as to be vertically movable and is screwed into the elevating screw 7. The lift 9 has
Two pressure cylinders 10 shown by dotted lines in the figure are formed so as to be separated from each other in the direction perpendicular to the paper surface of the figure, and the cutter head 12 is fixed to the two rams 11 urged downward by the pressure cylinders. There is. The two rams 11 are provided to prevent the cutter head 12 from rotating around the vertical axis. 1
Reference numeral 3 denotes a swing shaft that is swingably supported by a cutter head 12 about a vertical axis, and is biased to the lower end of this swing shaft in the trailing direction (drag direction) so that the rotary cutter 6 is free to rotate. It is supported.

Air pressure is supplied to the pressure cylinder 10 at the top and the peripheral surface of the ram 11. Due to the air pressure supplied to the peripheral surface, the ram 11 is supported in a floating state under static pressure, and the cutter 6 smoothly moves up and down according to small irregularities on the glass surface. Air pressure is supplied to the top of the ram 11 via a pressure setter 15, and the pressure setter 15 and the servo motor 8 are controlled by a controller 16. Controller 16
Is the position setting means for the scribe lines 17, 18 in the first and second directions, the cutting depth setting means for defining the rotation angle of the servomotor 8, and the cutting force setting for defining the set value of the pressure setter 15. Means, an increase value setting means, an increase start position setting means, and an increase section setting means, and prior to machining, the engraving positions of the scribe lines 17, 18 and the cutting depth L1 of the cutter 6 and the cutting force P1. , Increase value L2, increase start position S and increase section B are set.

FIG. 2 is a view exemplifying the scribe lines engraved on the glass plate 1, in which a plurality of scribe lines 17 in a first direction are shown by vertical lines and a plurality of second directions are shown by horizontal lines. And a scribe line 18 are engraved.

FIG. 4 is a flow chart showing a procedure for engraving the scribe line shown in FIG. When the cross scribe operation is instructed, the scribe line 17 in the first direction
The angle of the table 3 is set so that the direction is the traveling direction of the traveling platform 5, and the table 3 moves to the position of the first scribe line.
Then, based on the cutting depth L1 and the cutting force P1 set in the controller 16, the servo motor 8 and the pressure setter 1 are set.
5, the cutting depth and cutting force of the cutter 6 are set, and then the traveling platform 5 travels to engrave the first scribe line 17 in the first direction. Next, the table 3 moves to the position of the next scribe line, and the traveling platform 5 is run at that position to engrave the next scribe line. When all the scribe lines 17 in the first direction are engraved in this way,
After raising the elevating table 9 and retracting the cutter 6 upward, the table 3 is turned 90 degrees to rotate the scribe line 1 in the second direction.
The direction of 8 corresponds to the traveling direction of the traveling platform 5. Then, the scribe lines 18 in the second direction are sequentially engraved in the same procedure as when the scribe lines 17 in the first direction are engraved.

When engraving the scribe line 18 in the second direction, the cutter 6 detects the traveling position of the traveling table 5 by an encoder or the like provided on the ball screw 4, and the cutter 6 scribes the scribe line 17 in the first direction. When traversing, the elevating servo motor 8 is driven to move the elevating table 9 downward according to the value set in the increment setting means. Then, at a position immediately after the cutter 6 has crossed the scribe line 17 in the first direction, a return command is given to the servo motor 8 to return the lift 9 to the original height.

Specifically, for example, the cutting depth L1 is 0.15 mm, and the cutting depth L2 when increasing is 0.5 m.
m, the increase start position S of the cutting depth is set to 2.5 mm, and the increase section B is set to 5 mm, respectively, before the cross point 20 where the cutter 6 intersects each of the plurality of scribe lines 17 in the first direction. When approaching 2.5 mm, the servo motor 8 is given a descending command for the lift table 9 to lower the lift table 9 by 0.35 mm, and when the travel table 5 further travels 5 mm in that state, the servo motor 8 moves. Is given a return command, and the lift 9 returns to its original height.

The distance between the scribe lines 17 and 18 is, for example, 1.5 to 2 diagonals in the case of a mobile phone or a display panel of a PHS.
Inch, 10 to 20 for a personal computer display
Since it is about inch, 5 mm of the section where the cutting depth of the cutter increases is about 1/5 inch, and the section where the cutting depth occupies in the entire length of the scribe line in the second direction increases. Few.

FIG. 3 shows the relationship between the cutting depths L1 and L2 with the traveling of the cutter 6 on the glass plate 1 as the horizontal axis. The front side S that crosses the scribe line 17 in the first direction
The operation of increasing the cutting depth from L1 to L2 at the distance of 1 and returning the cutting depth to the original L1 at the position after passing the cross point after traveling only the section B is shown.

It should be noted that the cutting depth increasing start position, its holding section, and the numerical value of the cutting depth shown in this example are merely examples, and theoretically, the starting point of increasing the cutting depth is Further, it is preferable to approach the cross point and keep the holding period as short as possible, and the increase amount of the cutting depth should be adjusted depending on the material of the glass and the engraving state of the scribe line in the first direction. . As an example of preferable values, good results were obtained when the cutting depth was increased by about 4 times.

Since the liquid crystal panel and the like are composed of two glass plates, one of the glass plates is cross-scribed and then broken as shown in FIG. Insert the vertical and horizontal scribe lines in the same way. Further, in the above embodiment, the cutting depth of the cutter is increased when passing the cross point, but when passing the cross point, the pressure setter 15 is operated to pass the cross point. It is also possible to adopt a method in which the pressure applied to the cutter is increased immediately before, and the pressure is returned to the original pressure after passing the cross point.

[0029]

According to the method and apparatus of the present invention described above, when engraving the scribe line in the second direction,
The cutting depth and / or pressing force of the cutter is increased only when the cutter crosses the scribe line in the first direction, and in most other cases, the optimum set by the size relationship between the vertical crack and the horizontal crack. Since the scribe line can be engraved with a large cutting depth and pressure, it is possible to minimize the occurrence of chipping and potential cracking at the time of break.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a scribing device.

FIG. 2 is a diagram showing an example of a dividing line of a glass plate.

FIG. 3 is an explanatory view showing a cutting depth of a cutter.

FIG. 4 is a flowchart showing an example of a scribing method.

[Explanation of symbols]

1 glass plate 3 tables 5 platform 6 cutters 10 Pressure cylinder 16 controller 17 scribe line 18 scribe line

Claims (4)

[Claims] 1. A scribe line (1) in a first direction is produced by pressing a cutter (6) against the surface of a hard brittle plate (1) to run the cutter.
In the method of cross scribing a hard brittle plate, in which 7) is engraved, and then a scribe line in the second direction (18) that intersects the scribe line in the first direction is engraved, a scribe line in the second direction is provided. When engraving (18), the cutting depth of the cutter (6) is temporarily increased when the cutter (6) crosses the scribe line (17) in the first direction. Cross-scribe method for brittle plates. 2. A scribe line (1) in a first direction is produced by pressing a cutter (6) against the surface of a hard brittle plate (1) to cause it to travel.
In the method of cross scribing a hard brittle plate, in which 7) is engraved, and then a scribe line in the second direction (18) that intersects the scribe line in the first direction is engraved, a scribe line in the second direction is provided. When engraving (18), a hard brittleness characterized by temporarily increasing the cutting pressure of the cutter (6) when the cutter (6) crosses the scribe line (17) in the first direction. How to cross scribe a board. 3. A table (3) on which a hard brittle plate (1) is placed.
And a platform that travels in a plane parallel to the plane of this table.
(5), a cutter (6) mounted on the traveling platform via an elevating device (7) and a pressure device (10), and a controller (16), and the controller is the elevating device. Depth setting means for setting the ascending / descending position, cutting force setting means for setting the pressure of the pressure device, increasing value setting means, increasing section setting means, and a scribe line (17) in the first direction. ) Position setting means,
When the scribe line (17) is provided with the traveling position detecting means of the cutter (6) and the scribe line (18) in the second direction intersecting with the scribe line (17) is engraved, the cutter is provided. (6)
When the position reaches the position of the scribe line (17) in the set first direction or the position immediately before that, the section set as above,
A cross scribing device for a hard brittle plate, characterized by giving a descending command to the elevating device based on the set increase value. 4. A table (3) on which a hard brittle plate (1) is placed.
And a platform that travels in a plane parallel to the plane of this table.
(5), a cutter (6) mounted on the traveling platform via an elevating device (7) and a pressure device (10), and a controller (16), and the controller is the elevating device. Depth setting means for setting the ascending / descending position, cutting force setting means for setting the pressure of the pressure device, increasing value setting means, increasing section setting means, and a scribe line (17) in the first direction. ) Position setting means,
When the scribe line (17) is provided with the traveling position detecting means of the cutter (6) and the scribe line (18) in the second direction intersecting with the scribe line (17) is engraved, the cutter is provided. (6)
When the position reaches the position of the scribe line (17) in the set first direction or the position immediately before that, the section set as above,
A cross scribing device for a hard brittle plate, wherein a pressurizing command based on the set increase value is given to the pressing device.