JPH04328622A - Coordinate input device - Google Patents

Abstract

PURPOSE:To attract and fix an original sheet without deteriorating the coordinate input function by providing an electrostatic attraction device where the electrode groups containing alternately the positive and negative poles are printed in the conductive ink at the rear face side of a dielectric layer. CONSTITUTION:An electrostatic attraction device A is constituted of the electrode groups 2-5 provided alternately with the positive and negative poles connected to a DC power supply printed in the conductive ink at the rear face side of a synthetic resin sheet material 1 serving as a dielectric layer. Then the device A is set into a coordinate input device B with the layer 1 fixed by an adhesive onto an insulator sheet material 12 of an X coordinate input part 10 of the device B. An original sheet is set at a prescribed position of the layer 1, and the voltage is applied to the groups 2-5 from the DC power supply. Thus the original sheet is attracted and fixed on the layer 1. Under such conditions, the images, etc., drawn on the original sheet are traced with an input pen. Thus the coordinate input and editing operations are carried out.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a coordinate input device (
(coordinate reading board).

0002

2. Description of the Related Art When a coordinate input device traces (handwrites) an image drawn on a document sheet with an input pen, the coordinate input device reads the coordinate values of the locus of the input pen and inputs them into a computer. In such a coordinate input device, a manuscript sheet is positioned on the surface of the device, and handwriting is performed with an input pen while it is fixed. Electrostatic attraction force is generated as a means of fixing the document sheet to the surface of the device. Coordinate input devices using electrostatic adsorption devices are known (for example, Japanese Patent Application Laid-Open No. 1986-1
(See Publication No. 93036, etc.).

[0003] The electrostatic adsorption device is connected to a DC power source,
It is equipped with a group of electrodes in which positive electrodes and negative electrodes are arranged alternately, and a dielectric layer for dielectrically discharging the charge of each electrode, and by applying a predetermined voltage to each electrode from a DC power supply, electrostatic attraction force is generated. is generated, and the original sheet placed on the dielectric layer is attracted and held on the dielectric layer by this electrostatic attraction force. That is, when a predetermined voltage is applied to each electrode from a DC power source, a charge of a different polarity from that of each electrode is generated at a portion of the original sheet placed on the dielectric layer opposite each electrode due to electrostatic induction in the dielectric layer. This causes an electrostatic attractive force to act between the two charges of different polarity.

[0004] As shown in the above-mentioned publication, a conventional electrostatic suction device has an electrode group formed by printing with conductive ink on a synthetic resin sheet material as an insulating layer. A synthetic resin sheet material serving as a dielectric layer is integrated with the material by thermocompression bonding. In this case, a vinyl chloride resin sheet or the like with good printability is used as the synthetic resin sheet material as the insulating layer.

[0005]

[Problems to be Solved by the Invention] However, the conventional electrostatic adsorption device described above requires an insulating layer to integrate the electrode group with the dielectric layer, resulting in a thick structure.
In a pressure-sensitive coordinate input device, the input operation force (handwriting pressure with an input pen) must be increased. If the input operating force is insufficient, it becomes impossible to read the coordinate values correctly.

In a pressure-sensitive coordinate input device, the electrostatic chuck device provided on the surface of the device becomes a barrier to inputting coordinates, and its thickness greatly affects input operation force. As the thickness of the electrostatic chuck device becomes thinner, it becomes possible to accurately read coordinate values with a smaller input operating force.

The present invention has been made in view of the above situation, and an object thereof is to provide a coordinate input device capable of suctioning and fixing a document sheet without interfering with the coordinate input function.

[0008]

[Means for Solving the Problem] The coordinate input device according to claim 1 has electrodes connected to a DC power source on the back side of a synthetic resin sheet material serving as a dielectric layer, and having positive electrodes and negative electrodes arranged alternately. The present invention is characterized in that it includes an electrostatic adsorption device formed by printing a group using conductive ink.

The coordinate input device according to a second aspect of the present invention is characterized in that the synthetic resin sheet material serving as the dielectric layer is subjected to a surface modification treatment using a corona discharge treatment method or the like to improve printability.

A third aspect of the coordinate input device is characterized in that the conductive ink contains dielectric layer-based synthetic resin particles.

The coordinate input device according to a fourth aspect of the present invention is characterized in that a surface modification layer is printed on the surface side of the synthetic resin sheet material serving as the dielectric layer to improve durability.

[0012] In the coordinate input device according to the fifth aspect of the present invention, the synthetic resin sheet material as the dielectric layer is a transparent synthetic resin sheet material, and an electrode group and a surface design layer for improving the appearance are provided on the back side of the synthetic resin sheet material. It is characterized by being printed in layers.

[0013]

[Function] According to the above structure, it is possible to provide an electrostatic adsorption device having a thin structure in which the electrode group is directly integrated with the synthetic resin sheet material serving as the dielectric layer. This allows the pressure-sensitive coordinate input device to correctly read coordinate values with a small input operation force.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the coordinate input device of the present invention will be described below with reference to the drawings. FIG. 1 shows a coordinate input device according to the present invention, and FIGS. 2(a) and 2(b) show the basic structure of an electrostatic chuck device provided in the coordinate input device.

First, the basic structure of the electrostatic adsorption device (Fig. 2 (
A) and (b)) will be explained. The electrostatic adsorption device A consists of a synthetic resin sheet material 1 as a dielectric layer, and electrode groups 2 to 5 of positive and negative electrodes integrally provided on the back side of the synthetic resin sheet material 1 by printing. Electrode groups 2 to 5 are connected to a DC power source 6.

The synthetic resin sheet material 1 as the dielectric layer has good dielectric properties (dielectric constant 7 to 12, volume resistivity 101).
3~1015Ω・cm) PVF (polyvinyl fluoride)
Alternatively, PVDF (polyvinideline fluoride) is used. Since the PVF or PVDF used as the dielectric layer has poor adhesion with printing ink and is difficult to print, the surface is roughened by being subjected to a surface modification treatment such as a corona discharge treatment method. A DC power source 6 is placed on the back side of the synthetic resin sheet material 1 whose surface has been roughened to improve printability.
Electrode groups 2 to 5 connected to the electrodes are printed using conductive ink. ITO, Ag, carbon black, etc. are used for the conductive ink forming the electrode groups 2 to 5. Fluorine-based synthetic resin particles are mixed into this conductive ink in order to improve printability.

As shown in FIG. 2(b), the electrode groups 2 to 5 printed with conductive ink consist of a comb-shaped positive electrode 3.5 and a negative electrode 2.4. are arranged in an interlocking manner to form an electrode pattern in which positive electrodes and negative electrodes are alternately arranged. Such an electrode pattern exists over substantially the entire surface of the synthetic resin sheet material 1. Note that the electrode 3.5 is connected to the positive electrode side of the DC power source 6, and the electrode 2.4 is connected to the negative electrode side of the DC power source 6.

Next, the operation of the electrostatic chuck device A will be explained with reference to FIG. 2(a). First, the original sheet 7 is placed at a predetermined position on the dielectric layer made of the synthetic resin sheet material 1. Next, a voltage of about several kilovolts is applied to the electrode groups 2 to 5 by the DC power supply 6. When a predetermined voltage is applied to the electrode groups 2 to 5 in this way, each of the electrodes 2 to 5 is
A charge having a polarity different from that of the charge is generated by electrostatic induction in the dielectric layer, and an electrostatic attractive force acts between the charges (+, -) having different polarities. Therefore, the original sheet 7 placed on the dielectric layer is attracted and held by the dielectric layer by this electrostatic attraction force. During this operation, each of the electrodes 2 to 5 is in close contact with the dielectric layer, so the electrostatic attraction force does not decrease.

Furthermore, when the voltage applied to each electrode 2 to 5 is removed by turning off the DC power source 6, the charges generated in each electrode are discharged through the dielectric layer. Due to this discharge action, the electrostatic attraction force is attenuated, and the original sheet 7 on the dielectric layer is released from the attracted and held state. During this operation, each of the electrodes 2 to 5 is in close contact with the dielectric layer, so that the discharge action of residual charges is effectively promoted. Therefore, residual charges do not prevent generation of charges of opposite polarity when voltage is applied again.

Next, a coordinate input device according to the present invention (FIG. 1)
I will explain about it. In the coordinate input device B, the electrostatic chuck device A also functions as a top sheet. For this reason,
Synthetic resin sheet material 1 as dielectric layer of electrostatic adsorption device A
is a transparent synthetic resin sheet material, and a surface treatment layer 8 is printed on the front side to improve the matte effect, durability, slipperiness, etc., and a surface design layer 9 is printed on the back side. This improves the appearance. In this way, when the surface design layer 9 is printed on the back side of the synthetic resin sheet material 1, the electrode groups 2 to 5 are printed on the surface of the surface design layer 9.

The coordinate input device B has an X coordinate input section 10 and a Y coordinate input section 10.
It consists of a coordinate input section 11. The X coordinate input section 10 is formed by overlapping a sheet resistor 13 on the back side of an insulating sheet material 12, and the Y coordinate input section 11 is formed by overlapping a sheet resistor 15 on the front side of an insulating sheet material 14. Each of the sheet resistors 13 and 15 of the X coordinate input section 10 and the Y coordinate input section 11 is made of carbon, ITO, or the like. Then, each sheet resistor 13, 1
5 are opposed to each other with a plurality of dot-like spacers 16 interposed therebetween to form a predetermined interval. The spacers 16 are made of epoxy resin and are printed on one of the sheet resistors 15 at equal intervals by screen printing. A plurality of correction electrodes 17 are printed on the insulating sheet material 14 of the Y coordinate input section 11 by screen printing to improve coordinate position accuracy.

The electrostatic chuck device A is capable of inputting coordinates by adhesively fixing a synthetic resin sheet material 1 as a dielectric layer onto the insulating sheet material 12 of the X coordinate input section 10 with an adhesive such as epoxy resin. Installed for device B. Note that the structure of the X coordinate input section 10 and Y coordinate input section 11 constituting the coordinate input device B is a structure known as a pressure-sensitive coordinate input device, and is not the gist of the present invention.
Explanation of these operations will be omitted here.

As described above, the coordinate input device B is equipped with the electrostatic adsorption device A having a very thin structure in which the electrode groups 2 to 5 are integrated into the synthetic resin sheet material 1 as a dielectric layer.
Coordinate values can be read correctly with a small input operation force, and the coordinate input function is not impaired.

Furthermore, since the synthetic resin sheet material 1 as the dielectric layer of the electrostatic chuck device A can be printed, the surface treatment layer 8 and surface design layer 9 necessary as the surface sheet of the coordinate input device B can be printed. can be formed.

FIG. 3 shows the operating procedure of the coordinate input device B of the present invention. First, turn on the power of coordinate input device B (
Step S1). Next, the original sheet 7 is positioned at a predetermined position on the synthetic resin sheet material 1 serving as the dielectric layer of the electrostatic adsorption device A serving as the top sheet (step S2). Next, the adsorption switch of the electrostatic adsorption device A is turned on (step S3), a voltage is applied to the electrode groups 2 to 5 by the DC power supply 6, and the document sheet 7 is placed on the synthetic resin sheet material 1 as a dielectric layer. is fixed by suction (Step 4). In this state, coordinates are input and edited by tracing the image drawn on the manuscript sheet 7 using an input pen (step S5
). Next, turn off the adsorption switch of electrostatic adsorption device A (
Step S6), the suction of the original sheet 7 is released (step S7), and the original sheet 7 is removed from the electrostatic adsorption device A (step S8).

[0026]

[Effects of the Invention] As explained above, the coordinate input device of the present invention is equipped with an integrated electrostatic adsorption device with a thin structure by printing a group of electrodes on a synthetic resin sheet material as a dielectric layer. Therefore, even if it is a pressure-sensitive coordinate input device,
Coordinate values can be read correctly with a small input operation force, without interfering with the coordinate input function.

[Brief explanation of drawings]

FIG. 1 is a longitudinal side view showing the configuration of an embodiment of a coordinate input device of the present invention.

FIG. 2 is a longitudinal side view ((a)) and a back view ((b)) showing the basic structure of an electrostatic chuck device included in the coordinate input device of the present invention.

FIG. 3 is a flowchart showing the operating procedure of the coordinate input device of the present invention.

[Explanation of symbols]

A Electrostatic adsorption device 1 Synthetic resin sheet materials 2 to 5 as dielectric layers
Electrode 6 DC power supply 8 Surface treatment layer 9 Surface design layer

Claims (5)

[Claims] 1. An electrostatic adsorption device comprising a group of electrodes connected to a DC power source and having positive electrodes and negative electrodes arranged alternately on the back side of a synthetic resin sheet material serving as a dielectric layer, printed with conductive ink. A coordinate input device comprising: 2. The coordinate input device according to claim 1, wherein the synthetic resin sheet material serving as the dielectric layer is surface modified by a corona discharge treatment method or the like to improve printability. 3. The coordinate input device according to claim 1, wherein the conductive ink contains synthetic resin particles of the dielectric layer system. 4. The coordinate input device according to claim 1, wherein a surface modification layer is printed on the surface side of the synthetic resin sheet material serving as the dielectric layer to improve durability. 5. The synthetic resin sheet material serving as the dielectric layer is a transparent synthetic resin sheet material, and the electrode group and a surface design layer for improving appearance are printed and formed on the back side of the transparent synthetic resin sheet material in an overlapping manner. The coordinate input device according to claim 1, characterized in that: