JPH0353313Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coordinate reading device that requires high accuracy.

[Summary of the idea]

The present invention uses a flexible board to connect multiple sense lines arranged on the coordinate reading surface to the scanning circuit board, increasing the degree of freedom in wiring design, and taking noise countermeasures by using one side of the flexible board as a GND line. It is ivy.

[Conventional technology]

Conventionally, in a coordinate reading device, the sense wires arranged on the reading surface are connected to the circuit board by connecting a wiring material to the circuit board by soldering or the like to each one of the sense wires on the reading surface. was.

[Problems that the invention aims to solve] When connecting by the above-mentioned means, it takes a lot of effort to solder the sense wires one by one, and if the wiring material is too long, noise may be generated. In addition to this, the degree of freedom of the wiring material is restricted in order to maintain the reliability of the contacts, and the space becomes larger. In addition, there is no freedom in pattern design between the sense line on the reading surface and the circuit board, and the scanning circuit has to be large in order to provide a one-to-one correspondence.

[Means for solving problems]

In order to solve the above problems, the present invention uses a flexible board to connect the sense lines on the reading surface and the circuit board, and has a structure in which a large number of sense lines are connected at once by soldering or connectors.
In addition, we solved the noise problem by setting the front side of one side of the flexible board as GND, and furthermore, by connecting the sense line and every other GND line to the GND pattern of the flexible board, Wiring to the circuit board side has been reduced to approximately 1/2.

[Effect]

A flexible board is used to connect the coordinate reading surface to the circuit board, achieving a better GND, sharing wiring (GND pattern), downsizing the circuit board, and reducing the number of connector pins on the circuit board.

〔Example〕

An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a schematic diagram showing an embodiment of the present invention, in which a plurality of sense lines 2 and GND lines 3 are arranged every other line on a coordinate reading surface 1. Also, the ends of the sense line and the GND line are located at 1 of the coordinate reading surface 1.
It is designed to be located at the edge. One end of the flexible board 4 is provided with a pattern for connection at a position corresponding to the sense line and the GND line arranged at one end of the coordinate reading surface, and the other end is provided on the scanning circuit board 5. A connection portion for insertion into the scanning circuit board connector 6 is formed. Further, as shown in FIG. 2, in this flexible substrate 4, a surface pattern 7 connected to the sense line 2 provided on the upper surface of the base layer 12 is formed by a through hole 9 in the vicinity of the connection part of the sense line. Conductivity is established with a connection pattern 10 provided on the bottom surface of the substrate. Further, a back pattern 8 is provided on the entire lower surface as a conductive part 8 for GND, and the connection part with the GND line is formed in a comb-teeth shape, and one convex part is connected to one GND line. The sense line connection portion is provided between the comb teeth. Furthermore, an insulating layer 11 is formed on each pattern surface.

The GND wires on the flexible board 4 are combined into one on the side connected to the circuit board connector 6. Further, since the width of the flexible board is reduced on the side connected to the circuit board connector 6, the circuit board 5 can also be made smaller.

In the description of the present invention, the case where the sense line is on the front side of the coordinate reading surface is shown, but it is easily inferred that the flexible substrate 4 can also be used when the sense line is on the back side.

[Effect of idea]

As described above, according to the present invention, space can be saved due to the flexibility of the flexible board, and multiple conductors can be soldered at once (thermocompression bonding).
Since the connection can be made with , the effort of soldering is greatly reduced and costs are reduced. Also, the reliability of the contacts has been improved.

By sharing the GND line using a flexible board, the number of connector pins on the circuit board has been reduced, resulting in cost reduction.

By narrowing the width of the flexible board by grouping the patterns on the circuit board side of the flexible board, we have made the circuit board smaller, saving space and reducing costs.

By providing a GND better on a flexible board, it becomes more resistant to noise and improves S/N.
Contributes to improving reading accuracy.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA' in FIG. 1, and FIG. 3 is a sectional view taken along line BB' in FIG. 1...Coordinate reading surface, 2...Sense line, 4...Flexible board, 5...Scanning circuit board, 6...Scanning circuit board connector.

Claims (1)

[Scope of utility model registration request] A coordinate reading surface comprising a plurality of alternately arranged sense lines and GND lines, a scanning circuit board for sequentially scanning the sense lines, and a pattern connecting the sense lines and the scanning circuit on one surface of the base layer. . A coordinate reading device, characterized in that the sense line and the GND line on the coordinate reading surface are connected to a scanning circuit by a flexible substrate provided with a conductive member on the entire surface of the other surface and to which the GND line is connected.