JPH09160712A - Position input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position input device which can omit an excitation circuit and a phase difference detection circuit and can stably detect pointed position. SOLUTION: When a resonance circuit 4 of a position pointing device 5 approaches the 1st and 2nd coupling means 1 and 2, the electromagnetic coupling M1 and M2 are generated. Then, a positive feedback loop is formed to have the output of an amplifier circuit 3a and the inputs of the means 1, the coupling M1, the circuit 4, the coupling M2, the means 2 and the circuit 3a as a series of routes. The oscillation is generated at the frequency of the circuit 4 and an oscillation signal 101 is obtained. The amplitude of the signal 101 is controlled at a fixed level by an AGC circuit 9. The control output 103 of the circuit 9 varies according to the distances between the device 5 and both means 1 and 2 respectively. Then, the position information on the position pointing device 5 is obtained based on the control output 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position input device for supplying position information to electronic equipment such as a computer, and more particularly to a wireless position input device applying an electromagnetic induction phenomenon.

[0002]

2. Description of the Related Art Conventionally, this type of position input device excites a sense line with an excitation signal generated from an excitation circuit, and resonates a resonance circuit provided in the position indicator by a magnetic field generated from the sense line. The generated magnetic field is detected by another sense line, and this detection signal is amplified to obtain position information from the amplitude of the detection signal.

Further, as means for detecting the setting state of state setting means such as a switch provided in the position indicator on the main body side,
The resonance frequency of the resonance circuit provided in the position indicator is slightly changed by the state setting means, and the position input device body is set by detecting the phase difference between the reference excitation signal and the detection signal from the sense line. Detection was realized.

In addition, a large number of switches are mounted on the position indicator,
When a large number of status settings are required or when the status indicator needs to be extended, such as by providing a pen pressure detection function on the position indicator, slight changes in phase can be detected accurately and stably on the main unit. A detection circuit that can perform the detection is secured, and the resonance frequency of the resonance circuit is accurately adjusted during the manufacture of the position indicator. This has been achieved by using parts with good stability to obtain high stability.

[0005]

However, the conventional position input device of this type requires an excitation circuit and a phase difference detection circuit, and the circuit becomes more and more required to expand the state setting such as multiple switches. High precision and stability have been demanded, and such demands have complicated the circuit on the main body side and made miniaturization difficult.

Further, the position indicator has a problem that the adjustment work in the manufacturing process is increased and the cost is increased. As a result, it is difficult to expand the state setting means such as multi-switching and pen pressure detection. Was.

[0007]

In order to solve the above-mentioned problems, in the first structure of the position input device according to the present invention, an amplification circuit capable of controlling the amplification degree and a first structure connected to the output of the amplification circuit are provided. A coupling means, a second coupling means connected to the input of the amplifier circuit, a position indicator having a resonance circuit, and an AGC circuit for controlling the amplification degree of the amplifier circuit and keeping the amplitude of the output signal of the amplifier circuit substantially constant. , A position detecting means connected to the input side of the amplifier circuit to obtain position information indicated by the position indicator, and the resonance circuit is electromagnetically coupled to both the first coupling means and the second coupling means. , Amplifier circuit and first
Forming a feedback loop together with the coupling means and the second coupling means of (1) to form an oscillation circuit that oscillates at the resonance frequency of the resonance circuit, and the position detection means uses the amplitude information of oscillation obtained from the input signal of the amplification circuit to determine the position indicator The position input device is configured to obtain the position information.

Further, in the second structure of the position input device according to the present invention, in the structure similar to the first structure, the position detecting means is connected to the control signal line for outputting the control signal of the AGC circuit, and the position detecting means is connected. Configured the position input device so as to obtain the position information of the position indicator from the amplitude information of the oscillation obtained from the control signal.

Further, in the third structure of the position input device according to the present invention, the amplification circuit capable of controlling the amplification degree, the first coupling means connected to the output of the amplification circuit, and the second coupling device connected to the input of the amplification circuit. And a position indicator having a resonance circuit and a state setting means connected in parallel with the resonance circuit and having one or a plurality of switches, and controlling the amplification degree of the amplification circuit to control the amplitude of the output signal of the amplification circuit. An AGC circuit that keeps the voltage substantially constant, position detection means that is connected to the input side of the amplifier circuit to obtain position information indicated by the position indicator, and the state detection means that is connected to the input side or output side of the amplifier circuit The resonance circuit is electromagnetically coupled to both the first coupling means and the second coupling means to form a feedback loop together with the amplifier circuit, the first coupling means and the second coupling means. Na Forming a oscillating circuit that oscillates at the resonance frequency determined by the resonance circuit and the state setting means, and the position detecting means obtains the position information of the position indicator from the amplitude information of the oscillation obtained from the input signal of the amplifier circuit, The position input device is configured such that the detection means detects the state set by the state setting means from the frequency information of the oscillation signal.

Further, in the fourth configuration of the position input device according to the present invention, the amplification circuit capable of controlling the amplification degree, the first coupling means connected to the output of the amplification circuit, and the second coupling circuit connected to the input of the amplification circuit. Connecting means, a plurality of position indicators having a resonance circuit, an AGC circuit for controlling the amplification degree of the amplifier circuit to keep the amplitude of the output signal of the amplifier circuit substantially constant, and a position connected to the input side of the amplifier circuit. Position detection means for obtaining information on the position indicated by the indicator, and state detection means connected to the input side or the output side of the amplifier circuit to detect which of the plurality of position indicators indicates the position. Composed by
The resonance circuit is electromagnetically coupled to both the first coupling means and the second coupling means to form a feedback loop together with the amplifier circuit, the first coupling means and the second coupling means, and the resonance determined by the resonance circuit. An oscillation circuit that oscillates according to the frequency is formed, the position detecting means obtains the position information of the position indicator from the amplitude information of the oscillation obtained from the input signal of the amplifier circuit, and the state detecting means determines the position information from the frequency information of the oscillation signal. The position input device is configured so as to detect which of the position indicators is pointing.

Further, in the fifth structure of the position input device according to the present invention, the amplification circuit capable of controlling the amplification degree, the first coupling means connected to the output of the amplification circuit, and the second coupling means connected to the input of the amplification circuit. A plurality of position indicators each comprising: a coupling circuit; and a resonance circuit and a state setting means having one or a plurality of switches connected in parallel to the resonance circuit, the resonance frequency being determined by the resonance circuit and the state setting means. Are set to be different for each position indicator, an AGC circuit for controlling the amplification degree of the amplification circuit to keep the amplitude of the output signal of the amplification circuit substantially constant, and an input of the amplification circuit. Position detecting means connected to the side to obtain information on the position indicated by the position indicator, and which of the plurality of position indicators is connected to the input side or the output side of the amplifier circuit, And the state detecting means for detecting the state of the state setting means, and the resonance circuit is electromagnetically coupled to both the first coupling means and the second coupling means to thereby form the amplifier circuit, the first coupling means and the first coupling means. A feedback loop is formed together with the second coupling means to form an oscillation circuit that oscillates at the resonance frequency determined by the resonance circuit, and the position detection means uses the oscillation amplitude information obtained from the input signal of the amplification circuit to determine the position information of the position indicator. The position detecting device is configured to detect from the frequency information of the oscillating signal which one of the plurality of position indicators is pointing and the state set by the state setting means. .

Further, in the sixth to eighth structures of the position input device according to the present invention, in the structure similar to the third to fifth structures, the position detecting means is connected to the control signal line for outputting the control signal of the AGC circuit. In addition, the position detecting device is configured so that the position detecting means obtains the position information of the position indicator from the amplitude information of the oscillation obtained from the control signal.

Furthermore, in a ninth configuration of the position input device according to the present invention, in the first to eighth configurations, the first coupling means are parallel to at least one of the XY orthogonal coordinate axes and are equidistant from each other. A first scanning line group including a plurality of laid sense lines; and a first scanning circuit that is a circuit that sequentially selects the first sense line group and that is connected to the output of the amplifier circuit. The coupling means is a circuit that sequentially selects the second sense line group and a second sense line group that is composed of a plurality of sense lines that are parallel to at least the other axis of the XY orthogonal coordinate axes and are laid at equal intervals. The position input device is configured to include the second scanning circuit connected to the input of the amplifier circuit.

Furthermore, the tenth embodiment of the position input device according to the present invention
In the above configuration, in the ninth configuration, the first sense line group is composed of n sense lines, and the second sense line group is composed of m sense lines.
The first selected when the oscillation amplitude information shows the maximum value
And the sense lines in the second sense line group are the i-th and j-th sense lines, respectively, the selected combination of the first and second sense line groups is {(i
−1) th, jth}, {(i + 1) th, jth},
The amplitude information of five oscillations and the first and second scanning circuits are {i-th, (j-1) -th}, {i-th, (j + 1) -th} and {i-th, j-th}. The position input device is configured to obtain the position information of the position indicator based on each scanning signal to be scanned.

Furthermore, the eleventh embodiment of the position input device according to the present invention.
In the above configuration, in the first to tenth configurations, the position input device is configured such that the resonance frequency range determined by the resonance circuit and the state setting means is 100 kHz to 1 MHz. In the position input device according to the present invention, when there is a distance between the first and second coupling means and the resonance circuit, that is, when there is no magnetic coupling with each other, feedback is not configured between the input and output of the amplifier circuit. No oscillation occurs. However, when the distance between the first and second coupling means and the resonance circuit is reduced and magnetic coupling occurs with each other, the output of the amplification circuit, the first coupling means, the resonance circuit, the second coupling means, and the amplification circuit A positive feedback loop having a series of input paths is formed, and oscillation occurs at the resonance frequency of the resonance circuit. The oscillation amplitude appearing in the positive feedback loop changes according to the feedback amount determined by the distance between the first and second coupling means and the resonance circuit. The closer the distance, the larger the feedback amount and the larger the oscillation amplitude. As the distance increases, the feedback amount decreases and the oscillation amplitude decreases.

Here, an AG for controlling the amplification degree of the amplifier circuit
In the case where the C circuit is provided, the amplification degree of the amplifier circuit is sufficiently secured in a state where the resonance circuit is not coupled to the first and second coupling means, and the resonance circuit is connected to the first and second coupling means. When the oscillation approaches the means, the AGC circuit controls the amplification degree of the amplifier circuit to limit the output amplitude. This stabilizes the oscillation and the output amplitude of the amplifier circuit becomes constant thereafter. When the distance between the resonance circuit and the first and second coupling means is further reduced, the control signal output from the AGC circuit and the input signal of the amplifier circuit change according to the distance. Position information of the position indicator can be obtained from amplitude information of oscillation obtained from a control signal output from the circuit or an input signal of the amplifier circuit.

In the third or sixth configuration,
When the state setting means for changing the resonance frequency of the resonance circuit is provided and the resonance frequency of the resonance circuit is changed by the state setting means, the oscillation frequency appearing in the positive feedback loop also changes accordingly. Therefore, the state detecting means can detect this frequency information and detect the state set by the state setting means.

In the fourth or seventh configuration,
When a resonance circuit having a different resonance frequency is provided for each of the plurality of position indicators, and each of the position indicators indicates, the oscillation frequency appearing in the positive feedback loop also changes for each of the indicated position indicators. Therefore, the state detection means can detect this frequency information and detect which position pointing device is pointing.

In the fifth or eighth configuration,
A resonance circuit having a different resonance frequency is provided for each of the plurality of position indicators, state setting means for changing the resonance frequency of the resonance circuit is further provided, and an instruction is given by each position indicator, and the resonance frequency of the resonance circuit is determined by the state setting means. Is changed, the oscillation frequency appearing in the positive feedback loop is also changed for each instructed position indicator and for each state set by the state setting means. Therefore, the state detecting means can detect this frequency information, and which position pointing device is instructing, and the state set by the state setting means can be detected.

In the ninth structure, the first coupling means is a first sense line group, the first coupling means is a first sense line group, and the second coupling means is a second sense line. When the first and second scanning circuits are provided in each group, the resonance circuit includes a sense line sequentially selected by the first scanning circuit and a sense line sequentially selected by the second scanning circuit. To form a positive feedback loop, for example, the sense line selected by the first scanning circuit is located directly below the resonance circuit, and the sense line selected by the second scanning circuit is connected to the resonance circuit. The maximum oscillation amplitude is obtained when it is located immediately below, and the oscillation amplitude becomes smaller as the selected sense line becomes farther from the resonance circuit. The position detecting means can obtain the position information of the position indicator from the amplitude information of the oscillation signal obtained by scanning the first and second scanning circuits.

Further, in the tenth configuration, by comparing and calculating the five oscillation signals, it is possible to obtain detailed position information finer than the laying pitch of the sense lines.
In addition, in the eleventh configuration, it is not necessary to select a particularly high-performance amplifier as a constituent of the present invention, and the resonance frequency exhibiting stable amplification and phase characteristics for ease of design. Since it is configured to utilize the range, it is possible to realize a position input device that is advantageous in terms of cost and design.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a basic principle diagram of the present invention. In the figure, 3 is an amplification circuit, 1 is a first coupling means connected to the output of the amplification circuit 3, 2 is a second coupling means connected to the input of the amplification circuit 3, and 4 is a first coupling means 1. And a resonant circuit having electromagnetic coupling with both the second coupling means 2,
Reference numeral 5 is a position indicator having the resonance circuit 4, 101 is an oscillation signal output from the amplification circuit 3, 102 is an input signal of the amplification circuit 3, and 6 is position information of the position indicator 5 from the amplitude of the oscillation signal 101. Position detection means, M1 is electromagnetic coupling between the first coupling means 1 and the resonance circuit 4, and M2 is electromagnetic coupling between the second coupling means and the resonance circuit 4.

In FIG. 1, the position indicator 5 is at a position apart from the first coupling means 1 and the second coupling means 2,
When there is no electromagnetic coupling between the resonance circuit 4 and the first coupling means 1 and the second coupling means 2, no feedback occurs and no oscillation occurs. However, the position indicator 5 is located near the first coupling means 1 and the second coupling means 2, and the electromagnetic coupling M1 is provided between the resonance circuit 4 and the first coupling means 1 and the second coupling means 2.
And M2 occur, the output of the amplification circuit 3, the first coupling means 1, the electromagnetic coupling M1, the resonance circuit 4, the electromagnetic coupling M2, the second coupling means 2, and the input of the amplification circuit 3 are set as a series of paths, and A feedback loop is formed, and oscillation occurs at the resonance frequency of the resonance circuit 4. Oscillation is noise generated by the amplifier circuit 3,
It is excited by natural noise and the like, and is a well-known phenomenon in this kind of oscillation.

When the resonance circuit 4 and the first coupling means 1 and the second coupling means 2 come closer to each other, the oscillation frequency does not change, but the feedback amount changes according to the distance, and the closer the distance is, the shorter the distance is. The feedback amount increases and a large oscillation amplitude is obtained, and the feedback amount decreases and the oscillation amplitude decreases as the distance increases. In this way, an oscillation signal 101 having an amplitude corresponding to the position of the position indicator 5 is obtained from the output of the amplifier circuit 3, and the position detector 6
Can obtain position information from the amplitude of the oscillation signal 101.

The first and second coupling means may be in any form as long as direct feedback is not provided through the first and second coupling means when there is no coupling with the resonance circuit. May be. Although the absolute value of the amplitude is small, position information can be obtained from the input signal 102 of the amplifier circuit 3 in the same manner.

[0026]

【Example】

(Embodiment 1) Next, a first embodiment of the position input device of the present invention will be specifically described with reference to FIGS. 14 to 16 in which an AGC circuit for controlling the amplification degree of the amplifier circuit is provided.

FIG. 14 shows a structural example of this embodiment. In the figure, 3a is an amplification circuit capable of controlling the amplification degree, and 1 is a first
Coupling means, 2 is second coupling means, 4 is a resonance circuit, 5 is a position indicator, 6 is position detecting means, 101 is an oscillation signal, 1 is
Reference numeral 02 is an input signal, M1 and M2 are electromagnetic coupling between the first and second coupling means and the resonance circuit 4, 9 is an AGC circuit for controlling the amplification degree of the amplification circuit 3a, and 103 is a control signal output from the AGC circuit. Is.

FIG. 15 is a configuration example of the AGC circuit 9.
In the figure, 57 is a rectifier circuit, 58 is an integration circuit, 59 is a comparison circuit, 60 is an amplitude set value, 101 is an oscillation signal,
3 is a control signal. FIG. 16 shows a configuration example in the case where position information is obtained from the input signal 102.

The operation of the embodiment will be described below. In FIG. 14, the resonance circuit 4 includes the first coupling means 1 and the second coupling means.
Of the amplifier circuit 3a in a state in which the amplifier circuit 3a is not coupled to the coupling means 2 of FIG.
When the resonance circuit 4 approaches the first coupling means 1 and the second coupling means 2 and oscillation starts, the AGC circuit 9 controls the amplification degree of the amplification circuit 3a to generate an oscillation signal. Limit the amplitude of 101. That is, the AGC circuit 9
In FIG. 15, the oscillation signal 101 is rectified by the rectification circuit 57, integrated by the integration circuit 58, and the comparison circuit 59 compares the amplitude of the oscillation signal with the amplitude setting value 60. The control signal 103 is output to the amplifier circuit 3a so that the amplitude set by the value 60 is constant.

When the distance between the resonance circuit 4 and the first coupling means 1 and the second coupling means 2 becomes closer, the AG
The control signal 103 output from the C circuit 9 changes according to the distance, and the position detection means 6 obtains the position information of the position indicator 5 from the amplitude information of the oscillation obtained from the control signal 103 output from the AGC circuit 9. be able to. Thus AGC
Oscillation is stabilized by control by the circuit 9, the amplitude of the oscillation signal 101 becomes constant even when the position of the resonance circuit 4 changes, and position information can be obtained from the control signal 103 output from the AGC circuit 9.

Further, as shown in FIG. 16, position information can be similarly obtained from the input signal 102 of the amplifier circuit 3a. In this case, since the absolute value of the signal amplitude of the input signal 102 is not so large, another amplifier circuit may be provided to amplify this. Further, as another embodiment, even in the combination of the state setting means and the state detecting means which will be described later, the oscillation signal 101 having a constant amplitude can be used, and more stable detection can be performed. The amplifying circuit 3a of this embodiment has a V which can change the amplification degree from the outside.
It can be realized by a well-known one such as CA, for example, TL026.
(TI company).

As described above, in the position input device of the present invention, the AGC circuit for controlling the amplification degree of the amplifier is provided, and the dynamic range of the amplifier is effectively utilized to make the range of detectable distance of the position indicator wider. It is possible to obtain more stable oscillation. Further, the first and second coupling means may be any as long as they are described in other embodiments described later.

Another embodiment will be described below. Although the description of the AGC circuit is omitted in the description of these embodiments, an AGC circuit can be provided and configured as in the first embodiment. (Second Embodiment) Next, a second embodiment of the position input device of the present invention will be described with reference to FIGS.

FIG. 2 is a block diagram of this embodiment. 1a is a first sense line, 2a is a second sense line, 3 is an amplifying circuit, 4 is a resonance circuit, 5 is a position indicator, 6a is a position detecting means, 101 is an oscillation signal, 102 is an input signal, and 102 is an input signal. B and C are positions indicated by the position indicator 5.

FIG. 3 is a block diagram of the position detecting means 6a. Reference numeral 51 is a rectifying circuit, 52 is a smoothing circuit, 53 is an AD conversion circuit, 54a is a control circuit composed of a general CPU circuit, 101 is an oscillation signal, and 151 is an oscillation signal before AD conversion. FIG. 4 is a diagram showing an example of changes in the amplitude of the oscillation signal 151 of FIG. The vertical axis represents the amplitude of the oscillation signal 151, the horizontal axis represents the position indicated by the position indicator 5 in FIG. 2, and A, B, and C correspond to the positions A, B, and C in FIG.

FIG. 5 shows a second configuration example of the first sense line 1a and the second sense line 2a shown in FIG.
1b is a first sense line, 2b is a second sense line, 5 is a position indicator, and 4 is a resonance circuit. FIG. 6 is a third configuration example of the first sense line 1a and the second sense line 2a shown in FIG. 1c is a first sense line, 2c is a second sense line, 5 is a position indicator, and 4 is a resonance circuit.

The operation of this embodiment will be described below. In FIG. 2, the first sense line 1a and the second sense line 2a correspond to the first coupling means 1 and the second coupling means 2 shown in the basic principle diagram of FIG. 1, and the first sense line The first sense line 1a is connected to the output of the amplifier circuit 3, and the second sense line 2a is connected to the amplifier circuit 3a.
Connected to the input. As described above, when the first sense line 1a and the second sense line 2a are orthogonal to each other, there is no coupling between them, and if there is no position indicator 5, no feedback occurs and no oscillation occurs.

However, when the position indicator 5 is brought close to the intersection of the first sense line 1a and the second sense line 2a, the resonance circuit 4 causes the resonance circuit 4 to move to the first sense line 1a and the second sense line 1a.
Oscillation occurs when the positive feedback loop is formed and the oscillation signal 101
Is obtained.

The oscillation signal 101 is rectified by the rectifying circuit 51 in the position detecting means 6a, that is, in FIG.
2, digitized by the AD conversion circuit 53, and processed by the control circuit 54 a. Here, when the height from each sense line to the position indicator 5 is constant in FIG. 2 and the position indicator 5 is moved from position A to position C, for example, the oscillation signal 151 of FIG. An example of changes in the signal amplitude is shown in FIG. In FIG. 4, the amplitude increases from the position A to the position B, decreases from the position B to the position C, and a symmetrical change is obtained in which the position B, which is the center of the intersection of each sense line, is maximized. Therefore, in FIG. 3, the control circuit 54a controls the amplitude of the oscillation signal,
The distance from the position B to the position indicator 5 can be obtained from a table prepared in advance that associates the amplitude with the distance.

The amplifier circuit 3 can be realized by a well-known operational amplifier or an amplifier with a variable amplification degree as described in the first embodiment. If the positive feedback loop can be formed by the winding direction of the sense line and the connection polarity, the amplifier circuit 3 is inverted. Either type or non-inversion type is acceptable. Further, as a coupling means satisfying the condition that they are not coupled to each other when there is no resonant circuit, and are coupled to the resonant circuit when the resonant circuits are in the vicinity of each other, as shown in FIG.
In addition to the configuration such as the first sense line 1a and the second sense line 2a shown in FIG. 5, one sense line as shown in FIG. 5 is inverted on the way, and as shown in FIG. A configuration in which both sense lines are three-dimensionally crossed is also conceivable.

(Third Embodiment) Next, as a third embodiment of the position input device of the present invention, an embodiment in which the first and second coupling means are composed of a plurality of sense lines and scanning circuits will be described with reference to FIGS. It will be described based on 11.

FIG. 7 is a block diagram of this embodiment. In the figure, 5 is a position indicator, 1d is first coupling means, 2d is second coupling means, 3 is an amplifier circuit, 6b is position detecting means, and S is S.
Reference numeral 1 is a first sense line group having sense lines y1 to yn, 61 is a first scanning circuit connected to the output of the amplifier circuit 3 and sequentially selecting the first sense line group S1, and S2 is a sense line x1 to xm. A second sense line group having
Reference numeral 62 is a second scanning circuit which is connected to the input of the amplifier circuit 3 and sequentially selects the second sense line group S2. 101 is an oscillation signal. 102 is an input signal. 103 is a selection for selecting the first sense line group S1. The signal 104 is a selection signal for selecting the second sense line group S2.

Although not shown, the position indicator 5 has a resonance circuit similar to that shown in FIG. FIG. 8 shows the first
Is a configuration example of the coupling means 1d. S1 is a first sense line group, 61 is a first scanning circuit, 201 is a decoder, 2
11 to 21n are analog switches, 101 is an amplifier circuit 3
An oscillation signal 103 is connected from the output of the control unit 103. Reference numeral 103 denotes a selection signal output from the position detection unit 6b. Although the details of the second coupling means 2d are not shown, they have the same configuration as the first coupling means 1d, except that the first coupling means 1d is connected to the output of the amplifier circuit 3. , The second coupling means 2 d is connected to the input of the amplifier circuit 3.

FIG. 9 shows an example of the structure of the position detecting means 6b. 51 is a rectifier circuit, 52 is a smoothing circuit, 53 is an AD converter circuit, and 54b is a control circuit composed of a general CPU circuit. 10 and 11 are a waveform diagram of an oscillation signal and an explanatory diagram for calculating coordinates.

The operation of this embodiment will be described below. In FIG. 7, the case where the position indicator 5 is located at the intersection of the sense line x4 and the sense line y4 (A in FIG. 7) will be described. The first scanning circuit 61 first selects the sense line y1 of the first sense line group S1 according to the selection signal 103 output from the position detecting means 6b. That is, in FIG. 8, the decoder 201 turns on the analog switch 211 by the selection signal 103, and connects the output of the amplifier circuit to the first sense line y1. on the other hand,
The second scanning circuit 62 receives the selection signal 104 output from the position detecting means 6b during this period to generate the second sense line group S.
2 is sequentially selected as x1, x2 ... xm. When the scanning of the second sense line group is completed, the first scanning circuit 61 then uses the selection signal 103 output from the position detecting means 6b to output the first sense line group S.
1 sense line y2 is selected, and the second scanning circuit 62 outputs the selection signal 10 output from the position detecting means 6b during this period.
4, the second sense line group S2 is set to x1, x2 ...
Select xm sequentially. This scanning is similarly repeated thereafter, and finally the first scanning circuit 61 selects the sense line yn of the first sense line group S1 and the second scanning circuit 62 is selected.
During this period, the second sense line group S2 is set to x1, x2 ...
・ Select xm sequentially.

The position detecting means 6b has the oscillation signal 1 obtained by sequentially selecting the second sense line group S2.
The waveform of 01 is shaped by a rectifier circuit 51 and a smoothing circuit 52 shown in FIG. 9, the magnitude (amplitude) is sequentially digitized by an AD conversion circuit 53, and further processed by a control circuit 54b.

Details of the magnitude of the oscillation signal 101 will be described with reference to FIG. FIG. 10 is a waveform diagram when the position indicator 5 is located in the portion A of FIG. 7, and the selection signals 103 and 104 input to the first scanning circuit 61 and the second scanning circuit 62 and position detection. The oscillation signal (signal 151 in FIG. 9) before being AD-converted by the means 6b is shown.

Symbol a is an oscillation signal immediately below the section A, that is, when the first sense line y4 and the second sense line x4 are selected and is the largest signal among the signals generated during scanning. The reason is that the first sense line group S1
Of the sense line y4 closest to the position indicator 5
Is selected, the degree of coupling between the resonance circuit of the position indicator 5 and the sense line y4 is the largest, and similarly, the sense line x4 closest to the position indicator 5 is selected from the second sense line group S2. This is because the degree of coupling between the resonance circuit of the position indicator 5 and the sense line x4 is also the largest, and the greatest amount of feedback is obtained by maximizing the coupling between the two.

For b and c, the left and right sides of the section A, that is, when the first sense line y4 and the second sense line x3 are selected, and the first sense line y4 and the second sense line x5 are selected. Is the oscillation signal. In this case, the resonance circuit of the position indicator 5 and the first sense line y4
Are the same, but the magnitudes of the oscillation signal b and the oscillation signal c are smaller than the oscillation signal a due to the distance between the position indicator 5 and the selected second sense line.

Further, d and e are above and below the section A, that is, when the first sense line y3 and the second sense line x4 are selected, and when the first sense line y5 and the second sense line x4 are selected. This is the oscillation signal when In this case, the degree of coupling between the resonance circuit of the position indicator 5 and the second sense line x4 is the same, but the oscillation signal b is equal to the distance between the position indicator 5 and the selected first sense line. And the magnitude of the oscillation signal c becomes smaller than the oscillation signal a.

Although the oscillation signals a to e have been described above, the position of the sense line and the position indicator 5 selected from the first sense line group S1 and the second sense line group S2 for the other signals are also described. The size is determined by the positional relationship of. As described in the above embodiment, since the first sense line group S1 and the second sense line group S2 are orthogonal to each other, basically the first sense line group S1 and the second sense line group S1 are There is no coupling with the group S2, and oscillation does not occur without the position indicator 5. Therefore, as described above, the magnitude of the oscillation signal is considered based on the positional relationship between the position of the position indicator 5 and the position of the sense line selected from the first sense line group S1 and the second sense line group S2. Can be. Here above 5
Focusing on one of the oscillation signals a to e, a method of calculating coordinates will be described.

First, FIG. 11 shows the method of calculating the X coordinate.
The following description focuses on the oscillation signals a, b, and c based on the above. FIG.
(1) is an enlarged view of a portion around A shown in FIG.
Consider a case where the position indicator 5 moves on the center of the sense line y4 from the center L0 of the sense line x4 to the midpoint L1 between the sense line x4 and the sense line x5. FIG.
(2) and (3) show that the position indicators 5 are L0 and L1.
Are shown for the oscillation signals a, b, and c when the oscillation signal is located at the position shown in FIG.

First, the position indicator 5 shown in FIG. 11 (2).
Is located at L0. As described above, the oscillation signal a is applied to the sense line x4 while the sense line y4 is selected, and the oscillation signal b is applied to the sense line x3
And the oscillation signal c is a signal when the sense line x5 is selected. At this time, the oscillating signal a has the largest value, and the oscillating signals b and c correspond to the position indicator 5 and the sense line x.
3 and the distance between the position indicator 5 and the sense line x5 are equal to each other.

Next, the position indicator 5 shown in FIG. 11 (3)
Is located at L1. At this time, the oscillation signals a and c are equal because the distance between the position indicator 5 and the sense line x4 and the distance between the position indicator 5 and the sense line x5 are the same. Here, the coordinates can be calculated by applying the method proposed by the present applicant (JP-A-55-96411). That is, a calculation defined by the following equation is performed based on the oscillation signal.

Q = (Vp-Vp + 1) / (Vp-Vp-1) (Equation-1) where Vp + 1> Vp-1 In the above equation, the oscillation signal a is Vp and the oscillation signal is b to Vp-
1 and the oscillation signal c is substituted for Vp + 1.
FIG. 11D shows a change in Q shown in (Equation 1) when the movement from 0 to L1 is performed. It is clear from the above description that Q = 1 when the position indicator 5 is at the position L0 and Q = 0 when the position indicator 5 is at the position L1. When the position indicator 5 is located between L0 and L1, Q takes a value in the range of 0 <Q <1 corresponding to this position on a one-to-one basis. Therefore, the characteristics of the Q are experimentally determined in advance to calculate the Q from the oscillation signals a, b, and c, and the detailed position of the position indicator 5 between L0 and L1 on the sense line is calculated from the Q. Can be requested. Further, the X coordinate can be obtained from the Q and the position of the sense line where the oscillation signal a is detected. The details of this coordinate calculation method are described in JP-A-55-964.
Since it is described in Japanese Patent Publication No. 11-A, it is omitted here.

Next, a method of calculating the Y coordinate will be described with reference to the oscillation signals a, d and e based on FIG. The Y coordinate can be considered in the same manner as the X coordinate described above. In FIG. 11A, the position indicator 5 has a sense line x4
Is moved from the center L0 of the sense line y4 to the midpoint L2 between the sense line y4 and the sense line y5. 11 (5) and (6) show the position indicator 5
Are located at L0 and L2, the oscillation signal a,
This is for d and e.

First, the position indicator 5 shown in FIG. 11 (5).
Is located at L0. As described above, the oscillation signal a is applied to the sense line x4 while the sense line y4 is selected, the oscillation signal d is applied to the sense line x4 while the sense line y3 is selected, and the oscillation signal e is applied to the sense line y5. Is a signal when the sense line x4 is selected while is selected. At this time, the oscillation signal a has the largest value, and the oscillation signals d and e are equal because the distance between the position indicator 5 and the sense line y3 and the distance between the position indicator 5 and the sense line y5 are the same.

Next, the position indicator 5 shown in FIG. 11 (6)
Is located at L2. At this time, the oscillation signals a and e are equal because the distance between the position indicator 5 and the sense line y4 and the distance between the position indicator 5 and the sense line y5 are the same. Therefore, Q when moving the position indicator 5 from L0 to L2 as in the case of the X coordinate described above.
11 (7) is obtained by substituting the oscillation signal a into Vp, the oscillation signal d into Vp-1 and the oscillation signal e into Vp + 1 based on (Equation-1). . This is shown in FIG.
Characteristics similar to the characteristics in the case of the X coordinate of (4) are obtained, and the Y coordinate can be obtained using the characteristic of the Q similarly to the case of the X coordinate. The above processing is performed by the control circuit 54b (shown in FIG. 9) configured by a general CPU circuit.

(Fourth Embodiment) Next, a fourth embodiment of the position input device of the present invention will be described with reference to FIGS. 12 and 13 in which a state setting means and a state detecting means are provided. FIG. 12 is a configuration diagram of the present embodiment. In the figure, 3 is an amplifier circuit, 1 is a first coupling means, 2 is a second coupling means, 4
Is a resonance circuit, 5 is a position indicator, 6 is position detecting means, and 10
1 is an oscillation signal, 102 is an input signal, M1 and M2 are first
And electromagnetic coupling between the second coupling means and the resonance circuit 4, 7 is state setting means for changing the resonance frequency of the resonance circuit 4, SW
Reference numeral 1 is a first switch, SW2 is a second switch, and 8 is state detection means for detecting the state set by the state setting means 7 from the frequency of the oscillation signal 101.

FIG. 13 is a structural example of the state detecting means 8. In the figure, 55 is a waveform shaping circuit, 56 is a frequency counter circuit, and 54c is a frequency identification circuit composed of a general CPU circuit. Hereinafter, the operation of this embodiment will be described. 12, when the first switch SW1 and the second switch SW2 are turned off, the resonance frequency of the resonance circuit 4 is 300 kHz, and the first switch SW1 is turned off.
The resonance frequency when N is set to 280 kHz, and the resonance frequency when the second switch SW2 is turned on is 260 kHz.
When set to z, the amplification circuit 3
Is 300 kHz when the first switch SW1 and the second switch are turned off, and the first switch S
An oscillation signal 10 of 280 kHz when W1 is turned on and 260 kHz when the second switch SW2 is turned on
1 is obtained, and the oscillation signal 101 is output to the state setting means 8.

In FIG. 13, the oscillation signal 101 is waveform-shaped by the waveform shaping circuit 55, and the frequency counter circuit 5
6, and the obtained frequency is 300 kHz, 280 kHz and 2
The setting state of the first switch SW1 and the second switch SW2 can be detected by identifying which frequency corresponds to 60 kHz.

In identifying the frequency, 270 kHz
From the first switch SW1 in the range from
If the ranges are provided and the identification is performed as in the case where is ON, fluctuations in the resonance frequency due to temperature changes and variations in component constants can be absorbed.

In this embodiment, the position indicator 5 has two switches.
Although an example in which one unit is mounted is shown, the oscillation frequency, that is, the resonance frequency is preferably within a range in which the phase characteristics and the amplification degree of the amplifier circuit 3 are guaranteed, for example, 100 kHz to 1 MHz, and can be arbitrarily set within this band. This makes it possible to mount a larger number of switches on the position indicator 5 and identify them. For example, 300 kHz to 500 kHz
The frequency range up to z is divided into 10 and 1 for every 20 kHz
It is also possible to assign 0 switches, and these frequency assignments can be set in consideration of the variation range of the resonance frequency due to temperature changes, variations in component constants, and the like.

At this time, the frequency identification circuit 54c stores 30
20 kHz frequency range from 0 kHz to 500 kHz
Threshold value divided for each z, 300 kHz, 320 kHz
z, 340 kHz, 360 kHz, ..., 480 kHz
z, a threshold of 500 kHz is provided, and it is possible to identify which of the 10 switches has been operated by determining which frequency band the detected frequency is divided by these thresholds. .

It is also possible to realize the individual identification of the position indicators at the same time as the identification of the state setting by arranging a plurality of position indicators and assigning a specific frequency range to each of the position indicators. For example, when two position indicators equipped with two switches are provided, the resonance frequencies of the first position indicator are 300 kHz, 320 kHz, 340 k.
Hz and the resonance frequency of the second position indicator is 400 kHz.
z, 420 kHz and 440 kHz. In this way, when the first position indicator gives an indication, oscillation occurs in the 300 kHz band, and when the second position indicator gives an indication, 400 kHz.
Since the oscillator oscillates in the z band, the position indicator can be individually identified by a rough band of the oscillation frequency. The identification of the switch may be performed in the same manner as above by the detailed frequency identification within the band.

In this embodiment, as the state setting means for changing the frequency of the resonance circuit, a capacitor is connected in parallel to the resonance circuit and the resonance frequency is lowered when the switch is pressed. There are many other means for changing the resonance frequency of the resonance circuit, such as changing the frequency continuously with a writing pressure sensor instead of a switch and detecting the writing pressure with the state detection means. Needless to say, is also feasible. Further, the configuration of the position detecting means may be any configuration as long as it can detect a change in frequency, and is not limited to the present embodiment. Further, the first and second coupling means may be any as long as those described in the above-described embodiment.

Further, even if one switch is mounted or no switch is mounted, within the above frequency range (1
It goes without saying that it is desirable to select a frequency of (00 kHz to 1 MHz) as the resonance frequency.

[0068]

As described above, according to the present invention, the resonance frequency of the resonance circuit is directly converted into the oscillation signal by the simple structure of inserting the resonance circuit of the position indicator into the positive feedback loop of the amplification circuit. Since elements such as excitation and phase difference detection are not required, the circuit can be simplified. Further, since the resonance frequency can be arbitrarily set, there is an effect that scalability of the state setting means such as multiple switches and pen pressure detection can be easily obtained. By providing the AGC circuit, the oscillation signal of the positive feedback loop is stabilized, and there is also an effect that the detectable distance range of the position indicator can be made wider. Specifically, it has the following effects.

(1) It is possible to realize a position input device which eliminates the excitation circuit and the phase difference detection circuit, simplifies the circuit, and can stably detect the indicated position. (2) Excitation circuit and phase difference detection circuit are eliminated, the circuit can be simplified, the indicated position can be detected stably, and the state setting means has a plurality of switches provided in the position indicator. It is possible to realize a position input device capable of detecting

(3) The excitation circuit and the phase difference detection circuit are eliminated, the circuit can be simplified, the pointing position can be stably detected, and which of the plurality of position pointing devices is pointing. It is possible to realize a position input device that can detect the position. (4) As a combination of these purposes, the excitation circuit and the phase difference detection circuit are eliminated, the circuit can be simplified, and the pointing position can be detected stably, and any one of the plurality of position pointing devices can be used. It is possible to realize a position input device capable of detecting whether or not a pointing operation is performed and further detecting the status of status setting means having a plurality of switches provided in the position pointing device.

[Brief description of the drawings]

FIG. 1 is a basic principle diagram of a position input device of the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the position input device of the invention.

FIG. 3 is a position detecting means 6 according to a second embodiment of the present invention.
It is a block diagram of a.

FIG. 4 is a diagram illustrating an example of a change in amplitude of an oscillation signal 151 in FIG. 3;

FIG. 5 is a diagram showing a second configuration example of the first sense line 1a and the second sense line 2a shown in FIG. 2;

FIG. 6 is a diagram illustrating a third configuration example of the first sense line 1a and the second sense line 2a illustrated in FIG. 2;

FIG. 7 is a configuration diagram showing a third embodiment of the position input device of the invention.

FIG. 8 is a configuration diagram of a first coupling means 1d according to a third embodiment of the present invention.

FIG. 9 is a position detecting means 6 according to a third embodiment of the present invention.
It is a block diagram of b.

FIG. 10 is a waveform diagram of an oscillation signal in the third embodiment of the present invention.

FIG. 11 is an explanatory diagram for calculating coordinates in the third embodiment.

FIG. 12 is a configuration diagram showing a fourth embodiment of the position input device of the invention.

FIG. 13 is a configuration diagram of a state detecting means 8 in a fourth embodiment of the present invention.

FIG. 14 is a configuration diagram showing a first embodiment of the position input device of the invention.

FIG. 15 is an AGC circuit 9 according to the first embodiment of the present invention.
FIG.

FIG. 16 shows an input signal 10 according to the first embodiment of the present invention.
FIG. 3 is a configuration diagram in a case where position information is obtained from No. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first coupling means 2 second coupling means 3 amplifier circuit 4 resonance circuit 5 position indicator 6 position detection means 7 state setting means 8 state detection means 9 AGC circuit

Claims (11)

[Claims] 1. A position having a resonance circuit, an amplification circuit capable of controlling an amplification degree, a first coupling means connected to an output of the amplification circuit, a second coupling means connected to an input of the amplification circuit, and a resonance circuit. An indicator and an AGC circuit for controlling the amplification degree of the amplifier circuit to keep the amplitude of the output signal of the amplifier circuit substantially constant,
The resonance circuit is electromagnetically coupled with both the first coupling means and the second coupling means, the position detection means being connected to the input side of the amplifier circuit to obtain information on the position indicated by the position indicator. By doing so, a feedback loop is formed with the amplification circuit, the first coupling means, and the second coupling means, and an oscillation circuit that oscillates at a frequency based on the resonance frequency of the resonance circuit is formed. A position input device, wherein position information of the position indicator is obtained from amplitude information of oscillation obtained from an input signal of the amplifier circuit. 2. A position having a resonance circuit, an amplification circuit capable of controlling an amplification degree, a first coupling means connected to an output of the amplification circuit, a second coupling means connected to an input of the amplification circuit, and a resonance circuit. An indicator and an AGC circuit for controlling the amplification degree of the amplifier circuit to keep the amplitude of the output signal of the amplifier circuit substantially constant,
The resonance circuit comprises a position detecting means connected to a control signal line for outputting a control signal of the AGC circuit to obtain information on a position indicated by the position indicator, and the resonance circuit comprises the first coupling means and the second coupling means. By electromagnetically coupling with both of the means, a feedback loop is formed with the amplifier circuit, the first coupling means, and the second coupling means to form an oscillation circuit that oscillates at a frequency based on the resonance frequency of the resonance circuit. The position input device, wherein the position detecting means obtains position information of the position indicator from amplitude information of oscillation obtained from the control signal. 3. An amplification circuit capable of controlling the amplification degree, a first coupling means connected to an output of the amplification circuit, a second coupling means connected to an input of the amplification circuit, a resonance circuit and the resonance. A position indicator which is connected in parallel to the circuit and has a state setting means having one or a plurality of switches; and an AGC circuit which controls the amplification degree of the amplifier circuit and keeps the amplitude of the output signal of the amplifier circuit substantially constant. Position detecting means connected to the input side of the amplifier circuit to obtain information on the position indicated by the position indicator, and state detection connected to the input side or output side of the amplifier circuit to detect the state of the state setting means The resonance circuit is electromagnetically coupled to both the first coupling means and the second coupling means, so that the resonance circuit is fed back together with the amplification circuit, the first coupling means and the second coupling means. Loop None, forming an oscillation circuit that oscillates at a frequency based on the resonance frequency determined by the resonance circuit and the state setting means, and the position detecting means forms the position from the amplitude information of the oscillation obtained from the input signal of the amplification circuit. A position input device, wherein position information of an indicator is obtained, and the state detecting means detects the state set by the state setting means from frequency information of the oscillation signal. 4. An amplification circuit capable of controlling an amplification degree, a first coupling means connected to an output of the amplification circuit, a second coupling means connected to an input of the amplification circuit, and a resonance circuit. AGC for controlling the amplification degree of the plurality of position indicators and the amplifier circuit to keep the amplitude of the output signal of the amplifier circuit substantially constant
A circuit, position detecting means connected to the input side of the amplifier circuit to obtain information on the position indicated by the position indicator, and one of the plurality of position indicators connected to the input side or output side of the amplifier circuit. State detecting means for detecting whether or not the position indicator is pointing, and the resonance circuit is electromagnetically coupled to both the first coupling means and the second coupling means to thereby form the amplifier circuit and the A feedback loop is formed with the first coupling means and the second coupling means to form an oscillation circuit that oscillates at a frequency based on the resonance frequency determined by the resonance circuit, and the position detection means is an input signal of the amplification circuit. The position information of the position indicator is obtained from the amplitude information of the oscillation obtained from the position detection means, and the state detecting means determines which position of the plurality of position indicators from the frequency information of the oscillation signal. Position input device and detecting whether indicator is pointing. 5. An amplifier circuit having a controllable amplification degree, first coupling means connected to the output of the amplification circuit, second coupling means connected to the input of the amplification circuit, a resonance circuit and the resonance. A plurality of position indicators which are connected in parallel to a circuit and which include a state setting means having one or a plurality of switches,
A plurality of position indicators whose resonance frequencies determined by the resonance circuit and the state setting means are set to be different from each other for each position indicator, and the amplification degree of the amplification circuit is controlled to output the output of the amplification circuit. An AGC circuit for keeping the amplitude of the signal substantially constant, position detecting means connected to the input side of the amplifier circuit to obtain information on the position indicated by the position indicator, and connected to the input side or output side of the amplifier circuit. The resonance circuit includes a state detection unit that detects which one of the plurality of position indicators is pointing and the state of the state setting unit, and the resonance circuit includes the first coupling unit and the second coupling unit. Of the amplifier circuit, the first coupling means and the second coupling means to form a feedback loop by electromagnetically coupling both of the coupling means of An oscillation circuit that oscillates at a frequency based on the resonance frequency, the position detection means obtains position information of the position indicator from amplitude information of oscillation obtained from an input signal of the amplifier circuit, and the state detection means A position input device which detects which one of the plurality of position indicators is pointing and the state set by the state setting means from the frequency information of the oscillation signal. 6. An amplification circuit capable of controlling the amplification degree, a first coupling means connected to an output of the amplification circuit, a second coupling means connected to an input of the amplification circuit, a resonance circuit and the resonance. A position indicator which is connected in parallel to the circuit and has a state setting means having one or a plurality of switches; and an AGC circuit which controls the amplification degree of the amplifier circuit and keeps the amplitude of the output signal of the amplifier circuit substantially constant. A position detecting means connected to a control signal line for outputting a control signal of the AGC circuit to obtain information on a position indicated by the position indicator; and a state detecting means connected to an input side or an output side of the amplifier circuit. The resonance circuit is electromagnetically coupled to both the first coupling means and the second coupling means, thereby forming the amplification circuit, the first coupling means, and the first coupling means. Two bond Forming a feedback loop with the stage, forming an oscillation circuit that oscillates at the resonance frequency determined by the resonance circuit and the state setting means, and the position detecting means indicates the position from the amplitude information of the oscillation obtained from the control signal. A position input device, wherein position information of a container is obtained, and the state detecting means detects the state set by the state setting means from frequency information of the oscillation signal. 7. An amplification circuit having a controllable amplification degree, a first coupling means connected to an output of the amplification circuit, a second coupling means connected to an input of the amplification circuit, and a resonance circuit. AGC for controlling the amplification degree of the plurality of position indicators and the amplifier circuit to keep the amplitude of the output signal of the amplifier circuit substantially constant
A circuit, a position detection means connected to a control signal line for outputting a control signal of the AGC circuit to obtain information on a position indicated by the position indicator, and connected to an input side or an output side of the amplifying circuit. A state detecting means for detecting which one of the position indicators is pointing, and the resonance circuit is electromagnetically coupled to both the first coupling means and the second coupling means. Forming a feedback loop together with the amplifier circuit, the first coupling means, and the second coupling means, and forming an oscillation circuit that oscillates at a resonance frequency determined by the resonance circuit, and the position detection means includes the control signal. The position information of the position indicator is obtained from the amplitude information of the oscillation obtained from Position input device and detecting whether 示器 is pointing. 8. An amplifier circuit having a controllable amplification degree, a first coupling means connected to an output of the amplification circuit, a second coupling means connected to an input of the amplification circuit, a resonance circuit and the resonance. A plurality of position indicators which are connected in parallel to a circuit and which include a state setting means having one or a plurality of switches,
A plurality of position indicators whose resonance frequencies determined by the resonance circuit and the state setting means are set to be different from each other for each position indicator, and the amplification degree of the amplification circuit is controlled to output the output of the amplification circuit. An AGC circuit for keeping the amplitude of the signal substantially constant, a position detecting means connected to a control signal line for outputting a control signal of the AGC circuit to obtain information on a position indicated by the position indicator, and an input side of the amplifier circuit. Alternatively, the resonance circuit is composed of a state detection unit that is connected to the output side and detects which one of the plurality of position indicators is pointing and the state of the state setting unit. By electromagnetically coupling with both the coupling means and the second coupling means, forming a feedback loop together with the amplifier circuit, the first coupling means and the second coupling means, An oscillation circuit that oscillates at a resonance frequency determined by a vibration circuit, the position detecting means obtains position information of the position indicator from amplitude information of oscillation obtained from the control signal, and the state detecting means causes the oscillation. A position input device which detects which one of the plurality of position indicators is pointing and the state set by the state setting means from the frequency information of the signal. 9. The first coupling means is at least XY.
A first sense line group consisting of a plurality of sense lines parallel to one of the orthogonal coordinate axes and arranged at equal intervals, and a circuit for sequentially selecting the first sense line group, the output of the amplifier circuit And a second scanning line connected to the first scanning circuit, wherein the second coupling means is composed of a plurality of sense lines that are parallel to at least the other axis of the XY orthogonal coordinate axes and are laid at equal intervals. 9. A group according to claim 1, further comprising a group and a second scanning circuit which is a circuit for sequentially selecting the second sense line group and which is connected to an input of the amplifier circuit. Position input device. 10. The first sense line group is composed of n sense lines, the second sense line group is composed of m sense lines, and the oscillation amplitude information has a maximum value. When the sense lines in the first and second sense line groups selected at the time of indicating are the i-th and j-th sense lines, respectively, the selected combination of the first and second sense line groups is {(I-
1) th, jth}, {(i + 1) th, jth},
Amplitude information of five oscillations when {i-th, (j-1) -th}, {i-th, (j + 1) -th} and {i-th, j-th} and the first and second scanning circuits The position input device according to claim 9, wherein the position information of the position indicator is obtained based on each scanning signal for scanning. 11. The position input device according to claim 1, wherein a range of a resonance frequency determined by the resonance circuit and the state setting means is 100 kHz to 1 MHz.