JP3545815B2 - Contact coordinate detection sensor - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a contact point coordinate detecting sensor used to detect a contact point contacted by pressing as coordinates, and to grasp the shape of a pressed object from the contact points detected as coordinates.
[0002]
[Prior art]
Conventionally, as one of the sensors for detecting contact coordinates, a conductive line in the Y-axis direction and a conductive line in the X-axis direction are overlapped via a spacer, and one end of each conductive line is connected to an external electric signal control circuit. There was one of the configurations. A resin film was used as a support for the conductive wire. That is, two sheets of conductive lines printed and formed at regular intervals on a resin film are prepared, the printed surfaces of the conductive lines are opposed to each other, and the conductive lines formed on each resin film are arranged so as to be orthogonal. , And were superposed via a spacer (see FIG. 2 ). To detect the contact coordinates, the conductive wire in the Y-axis direction and the conductive wire in the X-axis direction are brought into contact by pressing from the non-printing surface side of the resin film, and the closed circuit generated by the contact is electrically connected. Scanning was performed in the signal control circuit, and the contacts were read as coordinates.
[0003]
[Problems to be solved by the invention]
Conventionally, the above-described sensor for detecting contact coordinates has been frequently used as input means of a computer. The inventor of the present invention has attempted to use the sensor for detecting contact coordinates for grasping the shape of a pressed object. That is, by detecting a plurality of contact points as coordinates and performing image processing using a computer, a set of the contact points is connected to grasp the shape.
[0004]
Conventionally, when used as an input means of a computer, input is performed by pressing a sensor for detecting contact coordinate from the non-printing surface side of the resin film with a pointed object such as an input pen or a fingertip. went. Erroneous input hardly occurred in an input with a simple pressed object such as an input pen or a fingertip. However, when a sensor for detecting contact coordinates is used to grasp the shape of a pressed object, a pressed object having a complicated shape may be used. For example, in order to grasp the meshing of the upper and lower teeth of a human (hereinafter referred to as a tooth row shape), there is a case where a sensor for detecting contact coordinates is input by being bitten by upper and lower teeth. However, in the conventional sensor for detecting contact coordinates, since a resin film is used as a support for the conductive wire, erroneous input frequently occurs in the case of input with a pressed object having such a complicated shape, and the shape can be accurately grasped. Did not. The possible causes are as follows. That is, in the case of a planar material such as a resin film, when pressing three or more distant points, a planar distortion connecting the multiple points occurs. The distortion propagates to a part other than the pressing part and causes an erroneous input.
[0005]
Accordingly, it is an object of the present invention to eliminate the above-mentioned disadvantages and to provide a contact coordinate detecting sensor capable of accurately grasping a shape without an erroneous input even when an input is made by a pressed object having a complicated shape.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the contact coordinate detecting sensor according to the present invention includes a Y-axis direction conductive mesh in which the vertical yarn is made of a conductive yarn and the horizontal yarn is made of an insulated yarn. And the X-axis conductive mesh made of an insulating yarn and the horizontal yarn is made of a conductive yarn. The conductive mesh of the Y-axis and / or the X-axis conductive mesh is overlapped. The insulating yarn was partially applied to the conductive yarn, and one end of each conductive yarn was connected to an external electric signal control circuit.
[0009]
Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic perspective view of another embodiment of the sensor for detecting contact coordinates according to the present invention, in which respective components are separated. Reference numeral 1 denotes a conductive yarn, 2 denotes an insulating yarn, 3 denotes a Y-axis direction conductive mesh, 4 denotes an X-axis direction conductive mesh , and 6 denotes an insulating coat.
[0010]
As the conductive yarn 1, a yarn made of a metal such as stainless steel, copper, brass, or a conductive material obtained by plating a fiber such as polyester with a flexible metal such as gold or silver is used. The thickness of the conductive yarn 1 may be selected according to the type of the pressed object and the use of the sensor for detecting the contact coordinates. Generally, when the shape is grasped and the accuracy is considerably required, such as the shape of a tooth row, it is preferable to use a wire having a diameter of 20 to 30 μm and a mesh number of 500 to 300 mesh. Further, even if the purpose is to grasp the shape, if accuracy is not required, a thicker one can be used. Further, even for the purpose of simply detecting the contact coordinates as in the conventional case, a wire diameter of 20 to 200 μm and a mesh number of 500 to 50 mesh can be selected according to the required accuracy. In addition, when it is used for simply detecting whether it is ON or OFF, a wire having a wire diameter larger than 200 μm and a coarse mesh may be used.
[0011]
As the insulating yarn 2, it is preferable to use a plastic single fiber such as polyester, nylon, or acrylic. Like the conductive yarn 1, the thickness of the insulating yarn 2 may be selected according to the type of the pressed object and the use of the sensor for detecting contact coordinates. However, the thickness of the insulating yarn 2 is substantially equal to that of the conductive yarn 2 due to the stability of the mesh. It is preferable to select a wire having a diameter of
[0012]
The Y-axis direction conductive mesh 3 and the X-axis direction conductive mesh 4 are meshes formed by using the conductive yarn 1 and the insulating yarn 2 and using either one as a warp and the other as a weft. The distinction between the Y-axis direction conductive mesh 3 and the X-axis direction conductive mesh 4 is such that when two meshes are superimposed, the one in which the longitudinal yarn is a conductive yarn is referred to as the Y-axis conductive mesh 3, Is a conductive yarn which is a conductive yarn. It is preferable that the Y-axis direction conductive mesh 3 and the X-axis direction conductive mesh 4 are overlapped so that the conductive yarns are orthogonal to each other. This is because the detection of the contact coordinates is simple and accurate. One end of each conductive yarn of the Y-axis direction conductive mesh 3 and the X-axis direction conductive mesh 4 is connected to an external electric signal control circuit.
[0014]
As the insulating coat 6 , an insulating material such as rubber or plastics may be used as a coating agent. According to this configuration, the portion provided with the insulating coat 6 is in contact with the conductive yarn except at the time of pressing, and thus has an insulating function. The parts without the insulating coat 6 are in contact with each other and exhibit a conductive function.
[0016]
[Action]
When the above-described Y-axis direction conductive mesh and X-axis direction conductive mesh are used instead of the sheet on which conductive lines are printed and formed at a certain interval in the conventional resin film, when three or more distant points are pressed. In addition, although some distortion occurs in the line connecting the multiple points, no planar distortion occurs. Therefore, the distortion of the resin film in the pressing portion hardly propagates to a portion other than the pressing portion, thereby causing erroneous input.
[0017]
There are various methods for detecting a contact point contacted by pressing as coordinates. For example, the following method can be used. The conductive yarn of the Y-axis direction conductive mesh is tentatively numbered from one end to correspond to the X coordinate. Also, the conductive yarns of the X-axis direction conductive mesh are similarly numbered to correspond to the Y coordinates. The conductive yarn of the Y-axis direction conductive mesh and the conductive yarn of the X-axis direction conductive mesh are brought into contact by pressing, and information from either one of the Y-axis direction conductive mesh and the X-axis direction conductive mesh is obtained. Thus, the closed circuit generated by the contact is scanned in the electric signal control circuit, and the contact is read as coordinates.
[0018]
In addition, in order to use this sensor for detecting contact coordinates to grasp the shape of a pressed object, a plurality of contacts are detected as coordinates, and image processing is performed using a computer, so that a set of these contacts is connected to grasp the shape. It is.
[0019]
The sensor for detecting contact coordinates according to the present invention can be used not only for detecting contact coordinates and for grasping the shape of a pressed object, but also for detecting whether it is simply on or off.
[0024]
【The invention's effect】
Since the sensor for detecting contact coordinates according to the present invention has the above-described configuration and operation, it is possible to accurately grasp the shape without erroneous input even when an input is made with a pressed object having a complicated shape.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of an embodiment of a sensor for detecting contact coordinates according to the present invention, in which respective components are separated.
FIG. 2 is a schematic perspective view in which respective components of a conventional sensor for detecting contact coordinates are separated.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conductive thread 2 Insulating thread 3 Y-axis direction conductive mesh 4 X-axis direction conductive mesh 6 Insulation coat

Claims (1)

The Y-axis conductive mesh, in which the vertical yarn is made of conductive yarn and the horizontal yarn is made of insulating yarn, and the X-axis, in which the vertical yarn is made of insulating yarn and the horizontal yarn is made of conductive yarn A conductive mesh is overlapped with the conductive mesh, and a conductive coating is partially applied to at least one of the conductive yarns of the Y-axis conductive mesh and the X-axis conductive mesh. A sensor for detecting contact coordinates, wherein the unit is connected to an external electric signal control circuit.

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