JPH01255026A - Manufacture of grid circuit for digitizer - Google Patents

Abstract

PURPOSE:To obtain a grid circuit with arbitrary size and capacity by forming a screw groove on a synthetic resin plate wound on a rotary cylinder being central-supported on a lathe, etc., winding and fixing a conductor wire in the parallel groove, and cutting it into a prescribed area. CONSTITUTION:A rotary drum 23 is supported rotatably between the headstock 24 and the tailstock 25 of the lathe by centers 26 and 27. A polyester film 4 is wound adhesively on the outer periphery of the drum 23, and also, it is engaged with the drum loadably/unloadably. A cutting tool 28 is screw-fed by the rotation of the motor 31 of a feed screw 30 being screwed on a tool post 29. Thus, V-shape parallel grooves 5 are engraved on the surface of the film 4 at a prescribed pitch. The conductor wire 6 is drawn out from a copper wire 32 wound in spiral shape, and after being soaked in a bonding agent bath 33, is fixed on one end of the parallel groove 5, and is wound on the parallel groove 5 by turning the drum 5 in a forward or a backward axis, then, it is joined and adhered. Next, the film 4 on which the conductor wire 6 is adhered is removed from the drum 23, and is cut into the prescribed area, thereby, the grid circuit for digitizer can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is capable of inputting various things such as mechanical drawings of arbitrary shapes, circuit diagrams, various maps, piping designs, power transmission and distribution diagrams, CT photographs, and ultrasound images. Manufacture of a grid circuit for digitizers, which is a main component of digitizers widely used for analysis, reading, etc., and is easily made by winding conductive wires around a synthetic resin plate such as polyester film. It is about the method.

[Conventional technology]

As shown in FIG. 13, a conventional digitizer includes a printed circuit board 14 having conductors arranged orthogonally along the X and Y directions on both sides, and a multiplacer wired to the conductors. Operation amplifier 15, AD
It is connected to the MI'U 17 via the converter 16 and the like, and is constructed by covering these circuits with a planar housing. A pen 18 having a built-in coil, a sensing cursor (not shown), etc. are electromagnetically engaged with the MPU 17.
The system is configured to read the correct coordinate position of the pen 18 etc. from the calculation result, and perform the above-mentioned input 9 image analysis, reading, etc. based on this.

To explain in more detail, as shown in FIG. 11, when distance is plotted on the horizontal axis and electromotive force ei is plotted on the vertical axis, the center MO of the pen 18 corresponding to the position of the maximum superpower ep of the electromotive force curve B is the maximum electromotive force. Measure the electromotive force induced in three nearby conductors,
This is calculated and calculated.

In the conventional digitizer, the printed circuit board having the above-mentioned functions is formed by etching or the like on a glass epoxy pudding mill substrate to form a printed circuit board in the form of a flat circuit.

If the printer 1 and the board are small as described above, there will be no movement problem, but if the printer 2 is large, for example, the side is 1 m or more,
Special soldering bath and etching treatment bath.

A problem arises in that a degreasing tank and the like are required and are extremely expensive.

[Problem to be solved by the invention]

As shown in FIG. 10, the digitizer 1 used in the present invention includes a switch 1 to a circuit 2, 3 which are arranged orthogonally to each other, and a switch controller 1 to a roll 9.
9, an AD converter 20 and a multiplacer 21, an MPU 22 connected to these, and a coil 12 built into a pointer such as a pen or cursor. When the pointer of the coil 12 is placed close to the grid circuits 2 and 3 as described above and an alternating current is passed through the coils, an electromotive force is induced in the grid circuits. The center of the pointer is read by measuring and calculating this electromotive force using the method described above.

In the case of the digitizer 1 having the above structure, the problem is how to create the grid circuits 2 and 3. As mentioned above, there are problems with area and cost when using glass epoxy print board 1 and substrate 14. On the other hand, manually operating the grid circuits 2 and 3 as shown in the figure generally requires 9 hours of skill and is expensive. Further, there are cases where the area cannot be freely set.

The present invention solves the above-mentioned problems, and allows a grid circuit to be produced easily and inexpensively, allows arbitrary area, wire diameter, pitch, etc. of the conductive wires to be used, and is lightweight and easy to manufacture. It is an object of the present invention to provide a method for manufacturing a grid circuit for a digitizer, which can be manufactured with high precision and can be easily performed using a general-purpose machine such as an existing lathe as a processing means.

[Means to solve the problem]

For this purpose, the present invention supports a rotary plate in a processing machine capable of rotation and thread feeding, such as a lathe, tightly wraps a synthetic resin plate such as a thin polyester film around the rotating plate, and then wraps it around the synthetic resin plate as appropriate. Forms threaded grooves with different depth and pitch dimensions,
While rotating the rotary plate forward or reverse, a conductive wire is inserted and fixed into the screw groove along the screw groove, and the synthetic resin plate with the conductive wire fixed thereon is developed into a flat plate and cut to form a grid circuit with an appropriate area. It is characterized by making sheets.

[Effect]

It is easy to thread threads into a synthetic resin plate wound around a rotary plate that is centrally supported on a lathe or the like. Further, it is also easy to wind and secure a conductive wire within this thread groove. In this way, a grid circuit sheet is formed which is fixed to the conductive wires within the parallel grooves recessed on the surface of the synthetic resin plate. By cutting this sheet into pieces with an appropriately sized area and arranging them vertically and horizontally at right angles, a digitizer 1 of any size can be created.
can be made.

〔Example〕

Hereinafter, one embodiment suitable for carrying out the present invention will be described based on the drawings.

As shown in FIG. 1, the rotating drum 23 is connected to the headstock 24 of the lathe.
It is rotatably supported by a center 26, 27 between the tailstock 25 and the tailstock 25. FIG. 2 shows the case where the polyester film 4 is wound around the outer periphery of the rotating drum 23 which is rotatably supported as described above. is possible to engage.

FIG. 3 shows a knife 28 (in this embodiment, a thread cutting knife) that engages with the outer periphery of the polyester film 4 wound around the rotating drum 23.
is used) is shown. The cutter 28 has a motor 31 of a feed screw 30 that is screwed into a nut 29 of the cutter support.
The screw is fed by rotation.

As a result, V-shaped thread grooves (referred to as parallel grooves 5) are formed on the surface of the polyester film 4 at a predetermined pitch.

Next, as shown in FIG. 4, means for winding and fixing the conductive wire 6 in the parallel groove 5 will be shown.

The conductive wire 6 is pulled out from a copper wire body 32 that has been previously wound into a coil, and is immersed in an adhesive bath 33 so that the tip of the conductive wire 6 is attached to the outer periphery of the parallel groove 5. By fixing it to one end side and rotating the rotating drum 23 in the forward or reverse direction, the conductive wire 6 is wound into the parallel groove 5 along the same and is fitted and bonded.

In this embodiment, a polyester film 4 having a thermal expansion coefficient of 1.5×10 and a thickness of about 0.13 mm is used, and the conductive wire 6 is an ordinary copper wire with a diameter of about 0.2+ nm, and the parallel grooves 5 are 60°. The V-shaped grooves were used, and the groove depth of the parallel grooves 5 was formed so that the tops of the conductive wires 6 slightly protruded from the surface of the polyester film 4, but the groove depth is of course not limited to this. Further, the adhesive may be any adhesive as long as it can relatively firmly adhere the polyester film 4 and the copper wire 6, and it is considered that any suitable adhesive liquid such as ordinary adhesive is sufficient.

Next, as shown in FIG. 5, when the polyester film 4 wound on the rotating drum 23 is removed and spread out flat, a large number of parallel grooves 5 and conductive wires 6 are formed as shown in the figure. You can get seats with rows. Grid circuits 2 and 3 of a desired area can be obtained by cutting this at right angles to the longitudinal direction of the conductive wire 6, as indicated by two-dot chain lines 35 and 36.

FIG. 6 and FIG. 9 show the cross-sectional shape,
7 and 8 show grid circuits 2 and 3, respectively.

The digitizer 1 used in this embodiment is formed from grid circuits 2 and 3 having the above-described structure, which are orthogonal to each other.

The grid circuits 2 and 3 have substantially the same shape, and their cross-sectional shape (line A--A) is as shown in FIGS. 6 and 9, as described above. In other words, the plate thickness is approximately 0.
A large number of V-shaped parallel grooves 5 are formed on the surface of the polyester film 4 having a length of about 13 m. A large number of parallel grooves 5 are arranged in the vertical and horizontal directions. The pitch dimension (P) of the parallel grooves 5 is set arbitrarily,
For example, a length of about 2 m is adopted.

The shape of the parallel groove 5 is a V-groove of approximately 60° as described above. Of course, it is not limited to these. A conductive wire 6 is fitted into the parallel groove 5 and fixed with an adhesive or the like. The conductive wire 6 used has a diameter of about 0.2 nm.

As mentioned above, FIG. 10 shows a grid circuit 2 having the above configuration.
, 3 is shown. That is, the grid circuit 2 and the grid circuit 3 are arranged so that the direction in which the conductive wires 6 are arranged is substantially orthogonal to each other.

One end of each conductive wire 6 is connected, for example, with solder wires 7 and 8. FIG. 12 shows an example of this connection method, in which a solder plated wire 37 is applied to each end of the conductive wire 6 and a soldering iron 38 is used. Switching controls 9 and 1 are provided on the unconnected conductive wire 6 side.
0 are connected respectively, switching control 9, 1
゜ is connected to a control device such as CPU II. The grid circuits 2 and 3 are insulated from each other, and are covered by a not-shown casing and formed into a flat plate shape. As described above, the coil 12 as shown in FIG. 10 is disposed above the planar grid circuit 2. An alternating current is supplied to the coil 12.

As described above, the coil 12 can be positioned on the drawing, and this is processed on the MPU 22 side.

The grid circuits 2 and 3 of this embodiment are relatively easy to manufacture, and can be made to any size by selecting the two-dot chain lines 35 and 36, and the diameter of the conductive wire 6 and the V-groove for this can be adjusted. The size and shape of the parallel grooves 5 can be changed arbitrarily, and the pitch dimension can also be easily and arbitrarily selected.

As one example, approximately 1500m x 120011I11
A digitizer 1 with an area of is actually manufactured.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, the following excellent effects can be achieved.

(1) A grid circuit of any size can be made using a simple and relatively inexpensive processing machine such as a lathe.

(2) Number and diameter of conductive wires that make up the grid circuit.

The pitch etc. can be freely selected and a digitizer with arbitrary performance can be created.

(3) The structure is simple, can be produced at low cost, and is lightweight.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an outline of a processing machine for processing an embodiment of the present invention, FIG. 2 is a perspective view showing a state in which a polyester film is wound around the rotary plate shown in FIG. 3
The figure is a perspective view showing the tool post that engages with the rotating plate, Figure 4 is an explanatory diagram of the process of winding and fixing the conductive wire in the parallel grooves created as described above, and Figures 6 and 9 are A in Figures 7 and 8
- A cross-sectional view, FIGS. 7 and 8 show a pair of grid circuits 2 formed by fixing conductive wires 6 on a polyester film.
, 3, and FIG. 10 is an overall configuration diagram of this embodiment.
FIG. 11 is an explanatory diagram of the principle of a digitizer, FIG. 12 is a perspective view showing one end of a grid circuit soldered with solder, and FIG. 13 is a schematic perspective view of a conventional digitizer. 1... Digitizer, 2, 3... Grid circuit, 4
...Polyester film, 5...Parallel groove, 6...
・Conductive wire, 7, 8...Solder wire, 9.10...Switching controller 1~roll, 17°22...MPU, 12
... Coil, 13... Electromotive force meter, 14... Printed circuit board, 15... Operation amplifier, 16...
AD converter, 18... Pen, 19... Amplifier source, 20... ADC121... Multiplayer, 23
... Rotating drum, 24... Headstock, 25... Tailstock, 26, 2'7... Center, 28... Cutting tool. 29... Nut, 30... Feed screw, 31... Motor, 32... Copper wire body, 34... Adhesive. 33...Adhesive tank, 35.36...Cutting line, 37.
...Soldering wire, 38...Soldering iron.

Claims (1)

[Claims] At least one pair of grid circuits, each consisting of multiple rows of conductive wires arranged at appropriate pitches on a synthetic resin plate such as a polyester film, are disposed insulated and orthogonal to each other, and the coils are electromagnetically connected to the grid circuits. etc., coordinate position detection,
In the method for manufacturing the grid circuit for a digitizer configured to perform reading, input, etc., a processing machine that tightly winds the synthetic resin plate around a rotating drum and supports the rotating drum so that it can be processed while supporting the rotating drum at the center. Thread grooves (parallel grooves) of appropriate depth and pitch are formed on the surface of the rotating drum on which the synthetic resin plate is tightly wound. Next, a conductive wire of a small diameter that can be inserted into the parallel groove is The rotating drum is rotated forward or backward while being pressed against the parallel grooves, the conductive wire is wound and fixed in the parallel grooves, and then the synthetic resin plate with the conductive wire fixed thereon is removed from the rotating drum and turned into a flat plate. 1. A method of manufacturing a grid circuit for a digitizer, comprising developing the grid circuit and cutting it into a predetermined area to make the grid circuit.