JP2002331413A - Fine cutting tool for correcting printed wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fine cutting tool capable of easily and safely cutting off a failure part such as a fine bridge generated in a manufacturing process of a printed wiring board. SOLUTION: This fine cutting tool is made so as to simultaneously perform cutting and removal in a shape having a horizontal blade and an edge of both side surfaces imparting a proper angle to the tip in a width of the size adjusted to a fine line width of the printed wiring board. The tool is installed in a writing material-shaped hand held holder so as to be capable of performing manual work. A holding base is imparted to the hand held holder so as to be capable of holding an angle to accurately perform work. Or the tool is used by being installed in a unit capable of manually performing mechanical operation, or is installed in an automatic machine of computer control to cut off a failure place. Since there is an edge on the tip, a work part does not becomes a dead angle even under a microscope, and work can be advanced while confirming the work so that the work can be easily and safely performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fine cutting tool for correcting a defect, such as a bridge, which generally occurs in a printed wiring board manufacturing process.

[0002]

2. Description of the Related Art In recent years, in the technique of manufacturing a printed wiring board, conductor patterns are becoming finer (less than 100 μm) year by year. Along with that, the occurrence of defective parts such as bridges has also increased. In such a case, it is discarded as a defective product, and there is a concern about the effect on the environment.

[0003] In the case where correction is possible, a commercially available disposable cutting tool is used to cut off the periphery of the copper foil at a defective portion as shown in 1.2 in FIG. 1 and a portion to be removed is removed with a cutter edge. A two-step operation of removal and removal is commonly performed. Publication number among published patent technologies
There are some that burn off while controlling the laser beam like 2001-68829, but it requires a large-scale device,
At present, it has not been put into practical use due to various circumstances.

[0004]

In recent years, printed wiring has been miniaturized and multilayered, and the fine repair work under a microscope can prevent the occurrence of scratches due to camera shake and damage to the lower wiring in the conventional method. Did not. FIG. 1 is a schematic diagram of a printed wiring board.In the manufacturing process, when a connected portion of the wiring as in 1. or a swollen portion as in 2. occurs, the cutting tool illustrated in FIG. 2 is used. After cutting the part to be left and the part to be cut, the copper foil 3. on the surface must be removed, but it is difficult to remove the copper foil fixed to the board without affecting the surrounding wiring. It required a lot of skill and was very inefficient.

[0005] Further, since the cutting edge of a commercially available cutting tool has a lower surface, the work site becomes a blind spot under a microscope viewed from directly above, and it is not possible to visually recognize how far the work has reached. In some cases, the blade may reach the printed wiring of the lower layer, and it is difficult to say that the correction can be reliably performed. Also, for the same reason, there was a drawback that the alignment was outside the target.

[0006] In the past, since there was no cutting tool of a fine size to perform manually, the quality of the finish required skill and was a difficult task for a beginner. Therefore, the work efficiency is poor, and it has not been easy to improve the yield.

[0007] In view of the above, the cutting tool provides a fine cutting tool that can be operated efficiently, simply and inexpensively without relying on a skilled person in this kind of repair tool, and reduces the waste of defective products. The aim is to reduce and contribute to ecology.

[0008]

The fine cutting tool of the cutting tool is a fine cutting tool for cutting and removing a defective portion such as a bridge of a fine wiring generated in a manufacturing process of a printed wiring board. It has a blade and edges on both sides. The material used is higher in hardness than copper, such as ceramic, super steel, high-speed steel. Further, the cutting tool is characterized in that a stopper guide for reducing the cutting depth to a certain value or less in the fine cutting tool is provided. Also, a writing tool-like holder capable of mounting the fine cutting tool of the cutting tool so as to allow manual work is combined. Further, the cutting tool is provided on the holder of the cutting tool to fix the angle of the cutting edge, and has a holding portion and a leg for holding the holder at a predetermined angle. In addition, a mechanical unit for manually and accurately operating the holder equipped with the fine cutting tool of the cutting tool, characterized in that the operation is reduced by a lever and the base and the frame are combined so as to amplify the forward force. I do. In addition, a monitoring unit, a calculation unit, an operation unit that can rotate and move up and down, and a horizontal direction, in which the fine cutting tool of the cutting tool is mounted on an appropriate holder and automatically operated so that a defective portion can be cut and removed. Device equipped with a series of functional parts such as a movable mounting table, frame, and base. Also, there is no problem even if the rotation and the vertical and horizontal movement functions of the operating unit and the mounting table are interchanged.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fine cutting tool using the cutting tool will be described below with reference to the drawings. FIG. 1 is a schematic view of a printed wiring board, but 1. a bridging portion and 2. a bulging portion may be generated in a manufacturing process. Figure 2 was previously modified using a commercial cutting tool as shown. FIG. 3 is a cross-sectional view of a blade of a cutting tool used conventionally, which has a cutting function but no special removing function. FIG. 4 is a schematic view of how to use the printed wiring board and the cutting tool fine cutting tool. Since the cutting tool has a 7. horizontal blade at the tip and 8. edges on both sides, the groove can be dug in a shape corresponding to the cross section of the blade by moving the tool forward.
At the same time, the cutting pieces of the copper foil can be discharged, and the two operations of cutting and removing, which were performed by the cutting tool, can be performed at once. Figure 5 is a three-sided view of the micro-cutting tool.
The degree of biting into the substrate is determined by the angle θ of the horizontal blade. The width of the groove that can be processed is determined by the size of the width W shown in the front view. FIG. 6 is a view showing the operation. By applying a constant force to the fine cutting tool in the direction of the arrow, the copper foil on the surface can be cut, and the cut piece is discharged to the front. At the time of work, the user can proceed with the work while observing the situation under a microscope. FIG. 7 shows a cross-sectional shape of the cutting tool tip, and 7-1 to 7-4 are representative shapes. 7-5 to 7-8 are shapes provided with a stopper guide for determining a certain depth. Of course, other cross sections may have 7. horizontal blades and 8. edges on the left and right. 8 and 9 show different shapes of the micro cutting tool. This shape is used to manufacture a special holder that matches the function, such as when operating mechanically or using an automatic machine. Other shapes are acceptable, but they have 7. horizontal blades and 8. edges on the left and right. FIG. 10 shows an embodiment of a hand-held holder fixing base for the fine cutting tool. 1
9. Attach the holder to the holder holder and 21. Semi-fix it with rubber so that it can be moved freely. Since the holder can properly maintain an appropriate angle, by applying an appropriate force from behind, the blade edge advances, and the defective portion can be easily cut off. The shape of the fixing base is not limited to the figures, and may be an inverted T type or a C type. FIG. 11 shows an embodiment for manually finely operating the fine cutting tool. 10. The holder to which the micro-cutting tool is attached is fixed semi-rotatably to the pin 25 fixed to the lever 27. 27.Lever is 26.
28. It is rotatably semi-fixed to the frame via pins. 28. The frame is fixed to the base 29. It is mounted on the target printed wiring board via the leg rubber 31. Since the printed wiring board can be placed freely without damaging it through the leg rubber, the micro-cutting tool attached to the tip of the holder can be safely moved to a target position. Until the position is determined, 32. The holder is pushed up by the spring, and the micro-cutting tool attached to the tip does not contact the printed wiring board and does not damage the copper foil. 24. Holder is positioned by 25. Pin and 30. Guide, so it can be surely matched to the target.
When the target is set, an appropriate force against the spring is applied from above the holder to bring the micro-cutting tool into contact with unnecessary copper foil. 27. Then, when the lever is moved forward, the fine cutting tool moves forward with the movement of the lever reduced by the function of the eccentric shaft. At the same time, since the force is amplified, the target unnecessary copper foil can be carefully cut without losing the cutting force. Therefore, the purpose can be easily and reliably achieved without causing camera shake. Fig. 12 is to automatically correct the defective part by computer control of the fine cutting tool, and mount the fine cutting tool of the cutting tool in a holder of appropriate shape 36. 38. Monitoring part, 39. Operation part, 35. Horizontal movable mounting base and 37. Vertical, rotating and movable parts are mounted to 33. Base and 34. The operation status is monitored by the monitor 40. The control input is performed by the keyboard 41.

[0010]

According to the cutting tool, when cutting and removing excess printed wiring copper foil, the operation of cutting the periphery of the defective portion with the blade of a commercially available cutting tool and the operation of removing the defective portion once are performed simultaneously. And work efficiently and safely.

[0011] Further, since the cutting is performed by pulling the blade on the front surface and moving forward instead of pulling the blade on the lower surface as in a conventional cutting tool, the working part does not become a blind spot even under a microscope. Work can be performed while visually recognizing.

Further, the angle of the cutting blade is set to an appropriate angle (60 to 90).
By setting to (°), the blade does not cut into the substrate, and it is easy to cut the surface while adjusting the copper foil on the surface to an appropriate thickness. Therefore, it is possible to work safely without damaging the laminated lower layer wiring.

Further, by providing the stopper guide at the position for determining the maximum cutting depth of the blade as described in claim 2, it is possible to perform a safer operation without damaging the lower wiring.

Further, the angle of the blade is accurately maintained by semi-fixing the holder on which the fine cutting tool is mounted to a table capable of holding the blade at an appropriate angle, thereby enabling cutting at a constant depth. In addition, uncertainty of manual work such as failure due to hand shake can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of a printed wiring board.

FIG. 2 is an external view of a commercially available cutting tool conventionally used.

FIG. 3 is a cross-sectional view of a conventional cutting tool blade.

FIG. 4 is a schematic view of a method of using the cutting tool.

FIG. 5 is a three-view drawing of the cutting tool.

FIG. 6 is an operation diagram of the cutting tool.

FIG. 7 is an example of a cross-sectional shape of the tip of the cutting tool.

FIG. 8 is another embodiment of the cutting tool.

FIG. 9 is another embodiment of the cutting tool.

FIG. 10 is an embodiment of a holder fixing base of the cutting tool.

FIG. 11 is an embodiment for manually finely operating the cutting tool.

FIG. 12 is an embodiment for correcting a defective portion by operation control by a computer using the cutting tool.

[Explanation of symbols]

 1 Bridge part 2 Cover part 3 Printed wiring copper foil 4 Spare blade 5 Board 6 Cutting edge 7 Horizontal blade 8 Edge 9 Support point 10 Fine cutting tool 11 Printed wiring copper foil 12 Board 13 Cut piece 14 Deformed fine cutting tool 15 Fixed hole 16 Deformed fine cutting Tool 17 Writing instrument holder 18 Angle holder 19 Holder 20 Rubber rubber through hole 21 Rubber rubber 22 Hole 23 Leg rubber 24 Pin 25 Pin 26 Pin 27 Lever 28 Frame 29 Base 30 Guide 31 Leg rubber 32 Spring 33 Base 34 Frame 35 Horizontal movable mounting Table 36 Holder 37 Up and down, rotating movable part 38 Monitoring part 39 Computing part 40 Monitor 41 Operation part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kozo Nishii 2-2 Sanadayamacho, Tennoji-ku, Osaka-shi, Osaka (Higashi Kogyo) Pascal Co., Ltd. F-term (reference) 3C050 AB02 AC02 5E343 AA02 BB24 ER51 FF21 GG20

Claims (6)

[Claims] 1. A fine cutting tool for finely cutting and removing a printed wiring copper foil adhered to a substrate, wherein the fine cutting tool has a horizontal blade and edges on both sides at a tip. 2. A fine cutting tool according to claim 1, further comprising a stopper guide for reducing a cutting depth to a predetermined value or less. 3. A fine cutting tool characterized in that the fine cutting tool according to claim 1 or 2 is combined with a writing tool-like holder so that manual work is possible. 4. A table for fixing an angle of a blade edge to the holder according to claim 3, wherein the table has a holding portion and a leg for holding a holder at a predetermined angle. . 5. A unit for manually mechanically operating the holder according to claim 3, wherein the holder is semi-fixed rotatably to a lever which is semi-fixed to be rotatable on a base and a frame. A unit characterized by being combined so as to move forward, reducing the operation of the lever, and amplifying the forward force. 6. A monitoring unit, a calculation unit, a rotatable operation unit, and a micro cutting tool according to claim 1, which is mounted on an appropriate holder and automatically operated so as to cut and remove a defective part.
An apparatus characterized by combining a series of functional components such as a horizontally movable mounting table, frame, and base.