JPH0594257A - Coordinate input device - Google Patents

Abstract

PURPOSE:To easily improve resolution by converting the strength of a magnetic field to the frequency and using a magnetoelectric converting semiconductor pulse sensor having directivity. CONSTITUTION:This device is equipped with a coordinate input pen 1, coordinate input panel 2 provided with the magnetoelectric converting semiconductor pulse sensor which output is expressed as the change of the frequency according to the strength of magnetic flux, and position detector 3. By making the coordinate input pen 1 close to the coordinate input panel 2, the magnetoelectric converting semiconductor pulse sensor of the coordinate input panel 2 is operated by the magnetic field from the coordinate input pen 1, and a frequency signal 4 is generated corresponding to the strength of the magnetic field. The frequency of this frequency signal 4 is detected, and the coordinate position is detected by the position detector 3. Thus, a circuit is simplified without using an analog circuit. Further, the reduction of position detecting accuracy caused by noise is decreased and cost is reduced as well for the coordinate input panel 2 and the coordinate input pen 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a coordinate input device for inputting coordinate positions with a pen.

[0002]

2. Description of the Related Art A conventional coordinate input device detects a position by contacting two electrodes facing each other such as a resistance film type or a comb type, or transmits and receives light like an optical type. The coordinate position is detected by detecting the point at which it is cut off, the coordinate position is detected by detecting the absorption of sound waves such as the surface acoustic wave method, or the capacitance is detected as the capacitance method. There is a method of detecting a position from a signal by coupling, or a method of detecting a position from a received signal by transmitting and receiving electromagnetic waves such as an electromagnetic dielectric method.

[0003]

However, in the above-mentioned prior art, in the case of the resistance film method or the like, there is a problem that durability is short due to contact between electrodes, a problem that resolution is low, and a problem that non-contact input is impossible. In the case of the optical method, there is a problem that the circuit scale is large, the resolution is low, and the parallax is large.
There is a problem that the device may be adversely affected, a problem that the resolution is low, a problem that there are many erroneous inputs, and in the case of the capacitance method, a problem that noise is large and an error is large, and a circuit becomes complicated. However, in the case of the electromagnetic induction system, there are problems that an A / D converter is used and the circuit becomes complicated, and that there is a problem that the cost becomes high.

Therefore, the present invention solves the above problems,
The objective is to be non-contact, durable, simple in circuit, and small in resolution.

[0005]

The coordinate input device according to the present invention comprises: (1) a matrix of a coordinate input pen for generating or holding magnetism, and a magnetoelectric conversion semiconductor pulse sensor for converting the strength of a magnetic field into a frequency and having directivity. It has a coordinate input panel arranged in a shape, and a position detecting device for detecting a position coordinate from a frequency signal generated when the coordinate input pen approaches or contacts the coordinate input panel.

(2) A coordinate input pen having a magnetoelectric conversion semiconductor pulse sensor having directivity by converting the strength of a magnetic field into a frequency, a magnetic generation panel having a plurality of magnetic field generating elements, and a magnetic generation panel on the magnetic generation panel. It is characterized by comprising a panel control device for controlling the magnetic field generation element and a position detection device for detecting position coordinates from a frequency generated when the coordinate input pen approaches or contacts the magnetic generation panel.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a basic block diagram of an embodiment of a coordinate input device according to claim 1, wherein 1 is a coordinate input pen and 2 is a FIG.
With the circuit configuration shown in FIG. 2A, as shown in FIG. 2B, a coordinate input panel having a magnetoelectric conversion semiconductor pulse sensor 5 whose output appears as a change in frequency depending on the magnetic flux density, 3 is a position detection device, and 4 is frequency. It is a signal. By bringing the coordinate input pen 1 close to the coordinate input panel 2,
The magnetic field from the coordinate input pen 1 operates the magnetoelectric conversion semiconductor pulse sensor 5 of the coordinate input panel 2 to generate the frequency signal 4 according to the strength of the magnetic field. The position of the coordinate signal is detected by the position detecting device 3 by detecting the frequency of the frequency signal 4.

FIGS. 3 (a) and 3 (b) are views showing a concrete example of the coordinate input pen according to the first aspect of the present invention.
Is an electromagnetic coil, 12 is a resistor, 13 is a power supply, 14 is a pen body, and 15 is a permanent magnet. The coordinate input pen of FIG. 3A includes a power source 13, a resistor 12, an electromagnetic coil 11, and a metal rod 10.
To form an electric magnet and generate a magnetic field through the metal rod 10. The coordinate input pen shown in FIG.
Generates a magnetic field.

FIGS. 4 (a) and 4 (b) are diagrams showing the operation principle of the coordinate input device according to the first aspect of the present invention.
4 are the magnetic-electric conversion element A, the magnetic-electric conversion element B, the magnetic-electric conversion element C, the magnetic-electric conversion element D, and the outputs from the respective magnetic-electric conversion elements are output A, output B, output C, and output D, respectively.
4B, each output when the coordinate input pen touches the touch position in the configuration shown in FIG. 4A is as shown in FIG. 4B. Therefore, the position coordinates can be input from the frequency change shown in FIG.

FIG. 5 is a diagram of a specific embodiment of the coordinate input panel according to the first aspect of the present invention, in which 30 is a substrate, 31 is a magnetoelectric conversion element, 32 is a common electrode, and 33 is a column electrode. Substrate 30 is a glass substrate, magnetoelectric conversion element 31, common electrode 32
The column electrode 33 may be a thin film to form a transparent panel.

FIG. 6 is a diagram showing a specific embodiment of the coordinate input panel according to the first aspect of the present invention. FIG. 6A is a perspective view of two panels, and FIG. In the diagram of the combined sectional structure, 41 is a common electrode, 42 is a column electrode, 43 is a substrate A, 44 is a substrate B, 45 is a gap material in which a conductor 47 is coated around an insulator 46, and 48 is a contact electrode. .. The two panels have a structure as shown in FIG. 6A, and the electrodes are attached so as to face each other. From the cross-sectional view, the contact electrode 48 and the column electrode 42 are in contact with each other by the gap material 45, and the substrate A43 and the substrate B44 are provided at a place other than this contact electrode 48.
Are configured so that they do not make electrical contact. FIG. 7 shows claim 1.
In the drawing of one specific embodiment described, 51 is an X selection switch,
52 is a Y selection switch, 53 is an X selection signal, 54 is a Y selection signal, 55 is a frequency signal, 56 is a frequency detector for detecting the frequency of the frequency signal 55, 57 is a CPU, and 58 is frequency data. One of the X selection switch 51 and the Y selection switch 52 is turned on by the X selection signal 53 and the Y selection signal 54, one magnetoelectric conversion element 31 is selected, and the output of the magnetoelectric conversion element is changed to the frequency. The signal 55 is output to the frequency detector 56, and the CPU 5
In 7, the frequency of the selected magnetoelectric conversion element 31 is held,
After examining all the magnetoelectric conversion elements 31, the coordinates are obtained from the coordinates of the magnetoelectric conversion element 31 having the highest frequency or the ratio of frequency strength, etc., and output as coordinate data.

FIG. 8 is a basic block diagram of an embodiment of the coordinate input device according to claim 2, 101 is a coordinate input pen, and 1 is a coordinate input pen.
02 is a magnetic generation panel, 103 is a panel control device, 10
4 is a position detection device, 105 is a panel control device, and 106 is a frequency signal. Magnetism is generated in one magnetic field generation element of the magnetic generation panel by the panel control device 103, the magnetic field is input from the coordinate input pen 101 as the frequency signal 106, the coordinate position is detected by the position detection device 104, and coordinate data is output. ..

FIG. 9 is a diagram showing a specific embodiment of the coordinate input pen and the position detecting device according to the second aspect of the invention. 110 is a pen body, 111 is a frequency detector, 112 is a CPU, 113 is a frequency signal, and 114 is a frequency signal. It is frequency data. The strength of the magnetic field is input as the frequency signal 113 by the magnetoelectric conversion semiconductor pulse sensor 5, and the frequency detector 111 detects the frequency of the frequency signal 113 and outputs frequency data 114. The CPU 112 detects the coordinate position from the frequency data 114 and outputs the coordinate data.

FIGS. 10 (a) and 10 (b) are diagrams showing the principle of operation of the coordinate input device according to the second aspect of the present invention, in which 121 to 125 are electromagnetic coil A, electromagnetic coil B, and electromagnetic coil C, respectively.
Electromagnetic coil D / electromagnetic coil E, and 126 to 130 are switches that turn on the respective electromagnetic coils, and are switch A, switch B, switch C, switch D, and switch E, respectively, as shown in FIG. 9 at the observation point. The output observed by the coordinate input pen or the magnetoelectric conversion semiconductor pulse sensor is as shown in FIG. Figure 10
Switching on in (b) means that in FIG.
, The other switch is off, and the electromagnetic coil A121 is used as an electromagnet.
Only the magnetic field is generated, and the output at the observation point in the above-mentioned state is shown.

As described above, by obtaining the output frequency in each switch state, the coordinates of the observation point can be set as the maximum point of the output frequency, or can be obtained from the amount of change in the frequency.

FIG. 11 is a diagram showing a specific embodiment of the magnetic field generating panel according to the second aspect of the present invention, in which 141 is an X selection switch and 14 is an X selection switch.
2 is a Y selection switch, 143 is a panel control circuit, 144
145 is an X selection signal / Y selection signal, 146 is an electromagnetic coil, 147 is a column electrode, and 148 is a common electrode.

The panel control circuit selects the electromagnetic coil 146 which generates a magnetic field, and the X selection signal 144 and the Y selection signal 145 turn on the switch of the X selection switch 141 corresponding to the above-mentioned electromagnetic coil 146, and the Y selection similarly. The switch 142 also turns on the corresponding switch. In this state, only one electromagnetic coil 146 generates a magnetic field, and all the electromagnetic coils 146 generate magnetic fields,
Coordinates can be detected by observing with a coordinate input pen.

FIG. 12 is a view of an embodiment of the magnetic field generating panel according to claim 2, 201 is a substrate, 202 is a column coil, 203 is a common coil, the dotted line portion is an electric wire running on the back side of the substrate, and the solid line Is an electric wire running on the surface, and each coil acts as an electromagnet.

FIGS. 13 (a) and 13 (b) are views of an embodiment of the magnetism generating panel according to claim 2, FIG. 13 (a) is a perspective view, and FIG. 13 (b) is a sectional view after bonding. , 211 is glass A, 212 is glass B, 213 is a column coil,
Reference numeral 214 is a common coil, each coil is made of a transparent electrode, and 215 is a gap material. The electrodes of the glass A and the glass B are configured not to come into contact with each other by the gap material 215, and a magnetic field can be generated by each coil.

When constructed as described above, it may be transparent or opaque.

[0021]

According to the invention as described above, by using the magnetoelectric conversion semiconductor pulse sensor, the circuit can be simplified without using an analog circuit, and the deterioration of the position detection accuracy due to noise can be reduced. The cost of the panel can be reduced, and the cost of the pen can be reduced. Furthermore, a cordless coordinate input device can also be realized.

[Brief description of drawings]

FIG. 1 is a basic block diagram of an embodiment of a coordinate input device according to claim 1 of the present invention.

FIG. 2 is a diagram showing a usage example and output characteristics of the magnetoelectric conversion semiconductor pulse sensor according to the present invention.

FIG. 3 is a diagram of a specific example of the coordinate input pen according to claim 1 of the present invention.

FIG. 4 is a diagram showing the operating principle of the coordinate input device according to the first aspect of the present invention.

FIG. 5 is a diagram of a specific example of the coordinate input panel according to claim 1 of the present invention.

FIG. 6 is a diagram of a specific example of the coordinate input panel according to claim 1 of the present invention.

FIG. 7 is a diagram of a specific example according to claim 1 of the present invention.

FIG. 8 is a basic block diagram of an embodiment of the coordinate input device according to claim 2 of the present invention.

FIG. 9 is a diagram of a specific example of the coordinate input pen and the position detecting device according to claim 2 of the present invention.

FIG. 10 is a diagram showing an operation principle of the coordinate input device according to the second aspect of the present invention.

FIG. 11 is a diagram of a specific example of the magnetism generating panel according to claim 2 of the present invention.

FIG. 12 is a diagram of an embodiment of the magnetic generation panel according to claim 2 of the present invention.

FIG. 13 is a diagram of an embodiment of the magnetic generation panel according to claim 2 of the present invention.

[Explanation of symbols]

 1,101 Coordinate input pen 2 Coordinate input panel 3,104 Position detection device 4 Frequency signal 5 Magnetoelectric conversion semiconductor pulse sensor 10 Metal rod 11,146 Electromagnetic coil 12 Resistance 13 Power supply 14,110 Pen body 15 Permanent magnet 21 Magnetoelectric conversion element A 22 Magnetoelectric conversion element B 23 Magnetoelectric conversion element C 24 Magnetoelectric conversion element D 30, 201 Substrate 31 Magnetoelectric conversion element 32, 41, 148 Common electrode 33, 42, 147 Column electrode 43 Substrate A 44 Substrate B 45, 215 Gap material 46 Insulation Body 47 Conductor 48 Contact electrode 51,141 X selection switch 52,142 Y selection switch 53,144 X selection signal 54,145 Y selection signal 55,106,113 Frequency signal 56,111 Frequency detector 57,112 CPU 58,114 Frequency data 102 Magnetism Generation panel 103,105 Panel control device 121 Electromagnetic coil A 122 Electromagnetic coil B 123 Electromagnetic coil C 124 Electromagnetic coil D 125 Electromagnetic coil E 126 Switch A 143 Panel control circuit 202,213 Column coil 203,214 Common coil 211 Glass A 212 Glass B

Claims (2)

[Claims] 1. A coordinate input device for inputting a coordinate position by a pen, wherein a coordinate input pen for generating or holding magnetism and a magnetoelectric conversion semiconductor pulse sensor for converting a magnetic field strength into a frequency and having directivity are arranged in a matrix. A coordinate input device comprising: the coordinate input panel described above; and a position detection device that detects a position coordinate from a frequency signal generated when the coordinate input pen approaches or contacts the coordinate input panel. 2. A coordinate input device for inputting a coordinate position by a pen, a coordinate input pen having a magnetic-electric conversion semiconductor pulse sensor having directivity for converting magnetic field strength into frequency, and a plurality of magnetic field generating elements. A magnetic field generating panel having the same, a panel control device controlling a magnetic field generating element on the magnetic field generating panel, and a position detecting device detecting position coordinates from a frequency generated when the coordinate input pen approaches or contacts the magnetic field generating panel. A coordinate input device having: