JPS61229116A - Coordinate position detecting element of graphic inputting device and its manufacture - Google Patents

Abstract

PURPOSE:To prevent the reduction of the accuracy of a graphic inputting device when the device is made larger in size by constituting a coordinate detecting element by arranging both X- and Y-direction insulating conductor groups. CONSTITUTION:Projections 5, each of which is formed in a circular truncated cone having the height of 1.5mm, bottom diameter of 2mm and top diameter of 1mm are formed at pitches of 4mm between the center of each projection 5 on a epoxy glass laminated plate for printed circuit which is a rigid base plate having the thickness of 3mm and area of 1,400mmX1,700mm and the total of 416 pieces of insulating conductors 6 having a diameter of 0.4mm are put between each row of the projections in X direction so that the conductors can have the effective width of 1.660mm in Y direction. In Y direction, a total of 341 pieces of the insulating conductors 9 are put between each row of the projections 5 in the same way so that they can have an effective with of 1.360mm in X direction. After the conductors 6 and 9 are installed, the spaces between the projections 5 are filled with an epoxy bonding agent having the low viscosity of 100-200cps and the bonding agent is hardened so that the insulating conductors 6 and 9 can be fixed. Then the margins of the base plate 1 are completely sealed with a silicone rubber adhesive under a condition where the end section of each insulating conductor 6 and 9 is conducted form the margins.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coordinate position detection element for a digitizer table used in an input device for handwritten characters and figures, and a method for manufacturing the same.

[Conventional technology]

Conventionally, as a coordinate position detecting element for this type of graphic input device, parallel conductor patterns are formed at predetermined intervals by etching on the surface of a glass plate or copper-clad printed circuit board having a metal-deposited surface, and these are connected to two conductor plates. It has been proposed to combine the patterns so that they are perpendicular to each other, or to form orthogonal conductor patterns by etching on the front and back sides of a board whose both sides are metal-deposited or copper-clad printed. These etchings are made of small plates (too omsx toooms).
(below), accuracy errors that did not become a problem tend to occur as the plate becomes larger (1,500 dragons x 2,000 f1 or more).In other words, accuracy errors due to expansion and contraction of the pattern mass Tatsumi film during exposure. , short circuits and disconnections due to uneven etching, and squareness errors occurred when assembling two boards or forming double-sided conductor patterns, which often made them unusable.Furthermore, each terminal part of a group of conductors in both x and y directions Since the pins are not led out from the edge of the board, there is a fatal flaw in that it takes time and effort to connect the conductor terminals. A conductor is stretched between the pins, and a film coated with adhesive is placed on top of it to secure the conductor.
There is a method that combines two pieces of this so that the parallel conductors are perpendicular to each other, but this has large accuracy errors due to errors in pin position, outer diameter, hole diameter, or errors in fixing the conductor to the film. However, it could not be adopted especially for large boards.

[Problem that the invention seeks to solve]

Recently, instead of the conventional manufacturing method described above, a method has been proposed and put into practical use in which insulated conductor groups are wired in both the KX and Y directions on a hard base plate, and then the reboiler group is fixed with adhesive. However, it is difficult to accurately arrange the insulated conductors in the X and Y directions on a rigid base plate, and the disadvantage is that they often become distorted in a pincushion shape toward the center as shown in Figure 5.

[Means for solving problems]

The present invention has been made to solve the above-mentioned drawbacks,
A detailed explanation will be given below based on the drawings.

1 and 2 are a perspective view and a sectional view showing the structure of a coordinate position detection element according to the present invention. Reference numeral 1 denotes a hard base plate, which is made of a hard synthetic resin plate with low thermal expansion and contraction, such as an epoxy glass laminate for printed circuits, a silicon glass laminate, or the like. 2 is a glass cloth placed on the base plate 1, and is adhesively fixed together with frames 3 and 4 surrounding it. 5 is the third
As shown in the enlarged drawings and FIG. 4, these are protrusions formed at equal intervals in the xyy directions of the base plate 1. Reference numerals 6 and 7 designate ultrafine conductors having a large number of insulating coatings laid in parallel and perpendicularly within the interval between the protrusions, and consisting of an X-direction insulating groove group 8 and a Y-direction insulating groove group 9. 10 is filled within the above-mentioned convex spacing x
y This is an adhesive layer that fixes the insulator group in both directions. If necessary, a hard protective plate is further placed and fixed on the fixed x and y direction insulator group for reinforcement. Each terminal portion 11 of the XY bidirectional insulator group 89 is led out from the edge of the base plate 1. Reference numeral 12 denotes a rubber-like adhesive with which the edge of the base plate 1 is sealed and bonded.

〔Example〕

Next, examples of the present invention will be described. The height is 1.5 on the epoxy glass laminate for printed circuits, which is a rigid base plate with a thickness of 3 mm and a size of 14001111 x 1700 m1k.
1111. Lower pole 21m11. A truncated cone-shaped convex object with an upper diameter of 1 ml is formed with a distance of 4 pitches between the centers of the convex objects.

416 insulated conductors with diameters of 41111 and KO within the distance between the protrusions were wired in the X direction (1660B in effect) and 341 insulated conductors in the Y direction (IJ60m in effect). Next, within the convexity interval 1
A low viscosity epoxy adhesive of c100-200 CPS was injected and cured to completely fix the wiring part. Then, with the end of each insulated conductor led out from the edge of the plywood, the edge was sealed with a silicone rubber adhesive.

When we measured the positional error of the orthogonal conductor of this coordinate position detection element, we found that it was 1659.994 in the X direction at the middle part of the wiring.
1s, the difference from the theoretical value was 0.00611S. Similar measurements were made on a device manufactured under the same conditions using plywood that does not form protrusions, and the result was 1659.78 in the X direction.
1 crane, the difference from the theoretical value was 0.219111. As shown in FIG. 5, in the case where there is no protrusion, the effect of shrinkage is greatest at the middle part of the wiring.

[Action and effect of the invention]

The coordinate position detection element according to the present invention obtained as described above is
Because the insulator groups are aligned in both directions, even large boards have fewer accuracy errors and squareness errors than conventional printed circuit etching boards made by orthogonally connecting two etched boards. A conductor pattern is formed. Further, since each terminal portion of the XY bidirectional insulator group is led out from each side of the base plate, the terminal connection work is facilitated.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a sectional view of a coordinate position detection element of a graphic input device according to the present invention, and FIGS. 3 and 4 are an enlarged perspective view and a sectional view of main parts of the element of the present invention. be. FIG. 5 is a plan view showing the wiring state of a conventional element. DESCRIPTION OF SYMBOLS 1... Hard base plate, 5... Protrusion, 8... X direction insulated conductor group, 9... Y direction insulated conductor group, 10... Adhesive layer, 11... Terminal part .

Claims (1)

[Scope of Claims] 1. Projections 5 formed on a rigid base plate 1 at equal intervals in both the X and Y directions, and a large number of parallel ultrafine conductors with insulating coatings wired within the distance between the projections. X-direction insulated conductor group 8 arranged
and a group of Y-direction insulated conductors 9 arranged perpendicularly thereto within the interval between the protrusions, and an adhesive layer 10 that is filled within the interval between the protrusions and fixes the groups of insulated conductors 8 and 9 in both the X and Y directions. , a coordinate position detection element for a graphic input device, in which each terminal portion 11 of the group of insulated conductors in both the X and Y directions is led out from the edge of the base plate 1. 2. Form protrusions on the hard base plate 1 at equal intervals in both the X and Y directions, and then wire a large number of ultrafine conductors with insulation coatings in parallel to the X direction within the spacing between the protrusions, and then wire them perpendicularly to A group of insulated conductors is wired in the Y direction within the interval between the protrusions so as to 1. A method of manufacturing a coordinate position detection element for a graphic input device, which comprises pouring an adhesive to fix a group of insulated conductors in both X and Y directions.