JP2976451B2 - Input device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial field B Outline of the invention C Conventional technology D Problems to be solved by the invention E Means to solve the problems (FIGS. 1, 5 to 7)
Fig. 1 F action (Fig. 1, Fig. 5 to Fig. 7) G embodiment (G1) Principle of position detection (Fig. 1 to 3) (G2) Discrimination principle of object disturbing excitation magnetic field (Fig. 4) (G3) First embodiment (FIGS. 6 to 8) (G4) Second embodiment (FIG. 9) (G5) Third embodiment (FIG. 10) (G6) Other Embodiments (FIGS. 11 to 13) H Effect of the Invention A Industrial Field of the Invention The present invention relates to an input device, and is suitably applied to, for example, an input device for handwritten characters and the like.

B. Summary of the Invention A resonant circuit resonating at the frequency of an exciting magnetic field by inserting a movable body having a plurality of resonant circuits each having a different resonant frequency into a uniform exciting magnetic field generated by an exciting coil. As a result, an operation that disturbs the uniformity of the excitation magnetic field is generated at the insertion position of the resonance circuit that has performed the resonance operation, and the position where the uniformity is disturbed is detected by the first detection having the first and second coils. The first detection signal of the means and the third and fourth coils L / 2 (L is the arrangement direction of the first, second, third and fourth coils) with respect to the first and second coils. In the output signal obtained based on the second detection signal of the second detection means superimposed at the position shifted by (width), it is detected as a phase shift of the output signal.

C Prior Art Conventionally, when inputting handwritten characters in a computer or the like, two-dimensional coordinate data input means such as a digitizer or a mouse is used.

In this type of two-dimensional coordinate data input means, a movable body having an excitation coil is moved on a doublet in which a predetermined detection coil is embedded, and at this time, an induced electromotive force excited by the detection coil is detected. The two-dimensional coordinate data of the movable body is detected.

Thus, by continuously detecting the coordinate data while moving the movable body, a handwritten character or the like can be input.

Further, by switching a switch provided on the movable body, the processing mode of the coordinate data is switched, whereby the display of input characters and the like can be switched.

D Problems to be Solved by the Invention In this type of two-dimensional coordinate data input means, it is necessary to supply an exciting current to a movable body in order to drive an exciting coil.

Further, in a movable body provided with a switch, it is necessary to transmit the switching of the switch to a computer.

For this reason, in the conventional two-dimensional coordinate data input means, there is a problem that the wire is extended from the movable body, and the coordinate data must be input while dragging the wire.

That is, when inputting handwritten characters or the like while dragging the wire, not only the usability is deteriorated, but also a failure such as disconnection of the wire cannot be avoided.

The present invention has been made in view of the above points, and has as its object to propose an input device capable of inputting coordinate data using a wireless movable body.

Means for Solving Problem E In order to solve this problem, the present invention provides an exciting coil 1 for generating a uniform exciting magnetic field Φ composed of an AC magnetic field.
And a drive signal generating means (1) for supplying a drive signal capable of selectively switching a plurality of frequencies to the exciting coil 1.
7, 19, 21, 22) and the first and second coils 26C (4, 5) each having a rectangular shape having a width L in the arrangement direction and having substantially the same configuration as each other are excited at positions adjacent to each other. A first detection means arranged to link with the magnetic field Φ and outputting a first detection signal V _X3 which is a difference signal between the induced electromotive voltages obtained from the first and second coils 26C (4, 5); 40, 44,
Third and fourth coils 27C (4, 5) each having a rectangular shape having a width L in the arrangement direction and having substantially the same configuration as each other,
First and second coils 26C (4, 5) adjacent to each other
In a position overlapping with the first and second coils 26C (4, 5) by being shifted by L / 2 in the same arrangement direction as the arrangement direction of
A second detection that is arranged so as to interlink with the excitation magnetic field Φ and outputs a second detection signal V _X4 that is a difference signal between the induced electromotive voltages obtained from the third and fourth coils 27C (4, 5). Means (42, 4
7, 46, 48) and a plurality of resonance circuits K1 to K3 each resonating with one of a plurality of frequencies and mounted at different mounting positions from each other, and the first and second coils 26C (4,
5) having resonance circuits K1 to K3 that resonate with the exciting magnetic field Φ when the third and fourth coils 27C (4, 5) are inserted into the exciting magnetic field Φ in the overlapping range; A movable body 35A that operates so as to disturb the uniformity of the exciting magnetic field Φ at the inserted position by causing the resonance circuits K1 to K3 to perform a resonance operation under the condition that:
By synthesizing V _X3 and V _X4 , an output signal having the frequency of the exciting magnetic field Φ is obtained.
A plurality of output signals S _X having a phase shifted by a phase corresponding to the position where the plurality of resonance circuits K 1 to K 3 of A are inserted, and a position signal forming unit 50 for sending out the plurality of output signals S _X based on the plurality of output signals S _X , The insertion position of the movable body 35A and the type of the movable body 35A,
A movable body identification means 11 for identifying the direction or the front and back and sending an identification signal is provided.

F action Multiple resonance circuits K1 ~ with different resonance frequencies
By inserting the movable body 35A having K3 into the uniform exciting magnetic field Φ generated by the exciting coil 1, the resonance circuits K1 to K3 resonating at the frequency of the exciting magnetic field Φ perform the resonance operation. In the insertion positions of the circuits K1 to K3, an operation that disturbs the uniformity of the exciting magnetic field Φ is generated, and the position where the uniformity is disturbed is determined by the first and second coils 26C (4,
5), the first detection signal V _X3 of the first detection means (40, 44), and the third and fourth coils 27C (4, 5) corresponding to the first and second coils 26C (4, 5). , 5) to L / 2 (L is the first,
The second, third and fourth coils 26C (4, 5), 27C (4,
In the output signal S _X obtained based on the second detection signal V _X4D of the second detection means (42, 47, 46, 48) superimposed at a position shifted by (5) in the arrangement direction), detecting a deviation of the output signal S _X phase, which makes it possible to form the insertion position of the wireless movable body 35A, the movable body 35A types, reliably identified identification signal and a direction or the front and back.

G Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

(G1) Position Detection Principle As shown in FIG. 1, an excitation coil 1 capable of generating a uniform magnetic field is connected to an oscillation circuit 2 and a drive circuit 3 to form an excitation magnetic field Φ. Place two coils 4 and 5 in Φ.

The coils 4 and 5 each have an opening having a rectangular shape and the same area, and are arranged so that the opening surface is parallel to the opening surface of the exciting coil 1.

Further, the coils 4 and 5 are arranged apart from each other by a predetermined distance so that one side of the coils 4 and 5 is overlapped to form a figure of eight.

As a result, in the coils 4 and 5, as long as the exciting magnetic field Φ is not disturbed, the magnetic flux interlinking with the exciting machine Φ is kept equal, and the coils 4 and 5 are excited by the exciting coil 1 to generate the same induced electromotive force. ing.

Further, the coils 4 and 5 are connected so that the overlapping sides cross each other.
Are induced to cancel each other.

Therefore, if one side of the coil 4 is connected to the amplifier circuit 7 to obtain the output voltage V ₀ , a balanced induced electromotive voltage can be obtained as long as the exciting magnetic field Φ is not disturbed.
V ₀ can be held at the 0 level.

On the other hand, when the excitation magnetic field Φ is disturbed by disposing a metal piece or the like in the excitation magnetic field Φ, for example, the induced electromotive voltage of each of the coils 4 and 5 changes accordingly, and the output voltage V ₀ corresponding to the change is obtained. be able to.

At this time, as shown in FIG. 2, an axially symmetric disk-shaped metal piece 8 is placed on one side where the coils 4 and 5 overlap (hereinafter, the axis on this one side is referred to as a central axis O). If an eddy current is generated in the metal piece 8, the central axis O
Is the axis of symmetry, and the excitation magnetic field Φ is disturbed.

In this case in the coils 4 and 5, the induced electromotive voltage is changed in a balanced state, even though the excitation magnetic field Φ is disturbed, the output voltage V ₀ is held at zero level.

On the other hand, when the metal piece 8 is displaced from the central axis O, the exciting magnetic field Φ
Exhibit different disturbances.

Accordance connexion this case, the equilibrium of the induced electromotive voltage in coil 4 and 5 are broken, the amplitude of correspondingly output voltage V ₀ is changed from 0 level.

Accordingly, as shown in FIG. 3, the distance from the central axis O to the metal piece 8 in the continuous direction of the coils 4 and 5 is represented by T.
Then, the output voltage V ₀ (FIG. 3 (A)) is calculated by the following equation. Can be approximately expressed by

Here, L is the length of one side of the coils 4 and 5 in the direction of the distance T, sin ωt is the drive signal of the exciting coil 1, K _1A
Represents a proportionality constant.

Thus, since the coils 4 and 5 are arranged in the exciting magnetic field Φ at a predetermined distance from each other and connected so as to cancel out the induced electromotive force, the coils 4 and 5 are arranged in accordance with the position of the metal piece 8 that disturbs the exciting magnetic field Φ. The balance of the induced electromotive voltages of the
The imbalance of the induced electromotive voltage can be detected via the output voltage V ₀ , whereby the position information T of the metal piece 8 that disturbs the exciting magnetic field Φ can be input as amplitude information.

Therefore, for example, a metal piece 8 that disturbs the balance of the coils 4 and 5
The coordinate data can be wirelessly input by using the object consisting of

Incidentally, if the coils 4 and 5 for generating the induced electromotive voltages so as to cancel each other out in this manner are formed in a figure eight shape,
The coils 4 and 5 having the same shape can be formed with high accuracy, and when the output voltage V ₀ is output through the lead wire, the effect of the exciting magnetic field Φ can be effectively avoided, and the output can be easily performed. You can input location information with high

(G2) Method of Identifying an Object Disturbing the Excitation Magnetic Field By the way, if coordinate data can be input using a plurality of movable bodies serving as coordinate data input means, the usability of the input device can be improved.

That is, if coordinate data can be input using a plurality of movable bodies simultaneously, for example, a plurality of persons can input handwritten characters at the same time.

Further, input is performed by alternately using a plurality of movable bodies. At this time, if the processing mode of the input coordinate data can be switched according to the movable body, for example, the display mode of the input handwritten characters can be switched. it can.

For this purpose, it is necessary to identify the movable body and input coordinate data.

In this case, as shown in FIG. 4, a parallel circuit 9A is formed by connecting the coil L1 and the resistor R1 excited by the exciting magnetic field Φ, and the coil L1 is arranged on the coils 4 and 5 instead of the metal piece 8. .

In this way, the coil L1 is excited by the exciting magnetic field Φ to generate an induced electromotive voltage, and a current flows through the coil L1 via the resistor R1.

Therefore, it can be seen that the exciting magnetic field Φ is disturbed by the current flowing through the coil L1, and the coil L1 terminated by the resistor R1 can be used as an object that disturbs the exciting magnetic field Φ.

Therefore, a coil terminated with a resistor R1 instead of the metal piece 8
If to use the L1, the coil L1 (1) can be obtained the relationship type, it is possible to detect the position information T of the coil L1 as the amplitude information of the output voltage V _0.

Further, at this time, if the resistance value of the resistor R1 is reduced, a large current flows through the coil L1, so that a large value can be obtained as the proportional constant _K1A of the equation (1).

Therefore, if the coil L1 terminated by the resistor R1 and the coil L2 terminated by the resistor R2 are used as an object that disturbs the exciting magnetic field Φ, if the coils L1 and L2 are alternately used,
(1) and from relationship detection proportional constant K _1A it can be seen that may identify coils L1 and L2 are.

That is, since the proportional constant K _1A changes according to the degree of coupling between the coils 4 and 5 and the exciting coil 1 which change according to the object existing in the exciting magnetic field Φ, the proportional constant K _1A is detected to detect the proportional constant K _1A. , The degree of coupling can be detected to identify the object present in the exciting magnetic field Φ.

Therefore, the display of the coordinate data input with the handwritten characters is switched based on the identification result of the coils L1 and L2, for example, and the usability of the input device can be improved.

On the other hand, as shown in FIG. 5, a coil (hereinafter referred to as a resonance coil) L1, a resistor R1, and a capacitor C1 coupled to the exciting magnetic field Φ are connected in series, and the exciting magnetic field Φ is used instead of the metal piece 8.
Place inside.

In this case, since the resonance coil L1, the resistor R1, and the capacitor C1 form a series resonance circuit 9C, When the exciting coil 1 is driven at the resonance frequency f determined by
The largest current flows through the resonance coil L1.

Further, at this time, if the resistance value of the resistor R1 is selected to be small and the sharpness Q of the resonance circuit 9C is increased, the resonance frequency f
While the largest current can flow through the resonance coil L1,
When the frequency of the drive signal is displaced from the resonance frequency f, the current flowing through the resonance coil L1 can be kept almost zero.

Therefore, when a resonance circuit 9D having a different resonance frequency from the resonance circuit 9C is configured by the resonance coil L2, the capacitor C2, and the resistor R2, and the resonance circuits 9C and 9D are simultaneously arranged in the excitation magnetic field Φ,
If the exciting coil 1 is driven at the resonance frequency of the resonance circuit 9C,
While the relationship of the formula (1) can be obtained only for the resonance coil L1 of the resonance circuit 9C, the excitation coil 1 is connected to the resonance circuit L1.
If driven at the resonance frequency of 9D, the resonance coil of the resonance circuit 9D
The relationship of equation (1) can be obtained only for L2.

Thus, when inputting the coordinate data, it can be seen that the position information can be input as the amplitude information by using the resonance coils L1 and L2 configured to form the resonance circuit as an object that disturbs the exciting magnetic field Φ.

Furthermore, even while the resonance coils L1 and L2 having different resonance frequencies are simultaneously in the excitation magnetic field Φ, by sequentially switching the frequency of the excitation magnetic field Φ, it can be understood that an object that disturbs the excitation magnetic field Φ can be identified based on the resonance frequency. .

On the other hand, when the resonance frequencies of the series resonance circuits 9C and 9D are selected to be equal, if the resistors R1 and R2 are selected to have different resistance values, the coupling of the exciting coil 1 is performed as described above for the parallel circuits 9A and 9B. The proportionality constant K _1A changes according to the degree.

Therefore, when the resonance coils L1 and L2 are selected to have the same resonance frequency, the resonance coils can be identified by alternately arranging them in the excitation magnetization Φ and detecting the degree of coupling.

(G3) First Embodiment (G3-1) Configuration of Embodiment In this embodiment, based on such a principle, coordinate data is input using a plurality of movable bodies at the same time.

That is, in FIG. 6, reference numeral 10 denotes a two-dimensional coordinate data input device as a whole, and a control circuit 11 having an arithmetic processing circuit configuration.
In accordance with the control signal S _C that is output from, to create a clock signal S _CK of a predetermined frequency.

That is, the clock signal generation circuit 12 uses a PLL (phase loc
consists of ked loop) oscillator circuit, by switching the division ratio in accordance with the control signal S _C, to create a clock signal S _CK switched is clock frequency for each predetermined time period, the 2-dimensional coordinate data input device 10, It is adapted to operate on the basis the clock signal S _CK.

This address counter circuit 15 with respect creates address data D _ADD read only memory circuit (ROM) 17 are sequentially cyclically count the clock signal S _CK.

The read-only memory circuit 17 stores the sine wave signal waveform data D _WAVE for one cycle, and sequentially and cyclically outputs the waveform data D _WAVE based on the address data D _ADD .

On the other hand, the analog digital conversion circuit 19 converts the waveform data D _WAVE into an analog signal,
The signal is applied to the exciting coil 24 at a predetermined signal level via the signal level correction circuit 22.

Thus, in the excitation coil 24, the clock signal S _CK
Is driven by a sine wave signal having a frequency determined by the following. At this time, the clock frequency is switched every predetermined period, so that the frequencies are sequentially changed to the frequencies f ₁ , f ₂ , f ₃ , f ₄ ,
f _5, it is adapted to be driven in turn switched sine wave drive signal S _D in f _6.

As shown in FIG. 7, the exciting coil 24 is housed in the housing case 30 and the plastic cover 32 together with the four printed boards 26, 27, 28 and 29, and the tablet 34 as a whole is provided.
Is made up.

Here, the printed boards 26, 27, 28 and 29 are connected to the wiring patterns formed on both sides thereof by through holes, thereby forming the figure-eight detection coils 26C, 27C, 28C and 29C described above with reference to FIG. Is formed.

That is, the detection coil 26C is connected so that the coils 26CL and 26CR cancel out the induced electromotive force, whereas the detection coils 27C, 28C and 29C are connected to the coils 27CL and 27C, respectively.
R, the coils 28CL and 28CR, and the coils 29CL and 29CR are connected so as to cancel the induced electromotive voltage.

Thus, in the detection coils 26C, 27C, 28C and 29C, the excitation coil 24 is excited to generate an induced electromotive voltage, and when there is no object that disturbs the excitation magnetic field Φ,
The induced electromotive voltages in the respective detection coils 26C, 27C, 28C and 29C are kept in a balanced state, and the output signals V _X1 , V _X2 , V _Y1 and V _{Y2 of} the respective detection coils 26C, 27C, 28C and 29C are at the 0 level. Is held.

In addition, printed circuit boards 26, 27, 28 and 29
When housed in 30, the detection coils 26C and 27C are arranged so that the center axis O of the detection coils 28C and 29C is orthogonal to the X direction, and the center axis O of the detection coils 28C and 29C is orthogonal to the Y direction.

Therefore, when an object that disturbs the exciting magnetic field Φ is placed on the plastic cover 32, each of the detection coils 26C, 27C,
When the object is located on the central axis O of 28C and 29C, the induced electromotive voltages are maintained in a balanced state in each of the detection coils 26C, 27C, 28C and 29C, and the output signals V _X1 , V _X2 , V _Y1 , V
_Y2 is held at the 0 level.

On the other hand, when an object disturbing the excitation magnetic field Φ moves in the X and Y directions from the central axis O, each of the detection coils 26C, 27C, 28C
And 29C, the balance of the induced electromotive voltage is lost, and the amplitudes of the output signals V _X1 , V _X2 , V _Y1 , V _Y2 change according to the moving distance.

Thus, the position information of the object disturbing the excitation magnetic field Φ, the excitation coil 24 and the detection coils 26C, 27
The degree of coupling of C, 28C, 29C and the output signals V _X1 , V _X2 , V _Y1 , V _Y2
Can be detected as amplitude information.

On the other hand, the detection coils 26C and 27C are arranged in the X direction by a distance L / 2 with respect to the length L of one side forming the figure eight, whereas the detection coils 28C
And 28C are arranged so as to be shifted by a distance L / 2 in the Y direction.

Accordingly, when an object that disturbs the exciting magnetic field Φ is placed on the plastic cover 32, X and the distance from the center axis O to the object that disturbs the exciting magnetic field Φ are set with reference to the center axis O of the detection coils 26C and 28C. Assuming that the distances in the Y direction are x and y, the output signals V _X1 and V _Y1 of the detection coils 26C and 28C are _expressed by the following equations according to the equation (1). Whereas the output signals of the detection coils 27C and 29C
V _X2 and V _Y2 are _expressed by the following equations. Can be represented by

Thus, the detection coils 26C and 27C and the detection coils 28C and 2
9C is displaced by a distance L / 2, so that when an object disturbing the excitation magnetic field Φ in the X and Y directions is displaced from the central axis O of the detection coils 26C and 28C, the displacement amounts x and y
_Sets of output signals V _X1 and V _X2 , V _Y1 and V _Y2 whose amplitudes change by 90 degrees in accordance with (FIGS. 3 (A) and (B))
Can be obtained.

On the other hand, as shown in FIG. 8, in the movable body 35A, the sharpness Q formed by using the resonance coils L1, L2, L3, the capacitors C1, C2, C3 and the resistors R1, R2, R3 is large. It has three resonance circuits K1, K2, and K3. When the movable body 35A is placed on the plastic cover 32, the resonance coils L1, L2,
L3 is excited by an exciting magnetic field Φ.

On the other hand, the movable body 35B has the same shape as the movable body 35A, and the resonance circuits K4, K5, and K6 are arranged at the same position as the movable body 35A instead of the resonance circuits K1, K2, and K3. I have.

The resonance circuits K1, K2, K3, K4, K5, K6 each have a frequency
_{f 1, f 2, f 3} , f 4, to resonate at f _5, f _6, resonant coil
L1 to L6, the value of the capacitor C1~C6 been selected, thereby when the exciting coil 24 is driven at a frequency _{f 1, f 2, f 3} , f 4, the drive signal S _D of f _5, f _6, Resonant circuits K1, K2,
Current flows only through the resonance coils L1, L2, L3, L4, L5, and L6 of K3, K4, K5, and K6, and almost no current flows through the resonance circuits K1 to K6 having different resonance frequencies.

Accordingly, in the two sets of output signals V _X1 and V _X2 and V _Y1 and V _Y2 , when the excitation coil 24 is driven by the drive signal _SD having the frequency f ₁ , the resonance coil L1 disposed on the movable body 35A
Since the exciting magnetic field Φ is disturbed in, whereas the resonance coil L1 (3) to (6) of the relationship obtained, the frequency of the drive signal S _D is switched to the frequency f _2, the excitation magnetic field Φ Is switched to the resonance coil L2, the relations of the expressions (3) to (6) are obtained for the resonance coil L2.

Further the frequency of the drive signal S _D is switched to the frequency f _3, from the object that disturbs the exciting magnetic field Φ be switched to the resonance coil L3, the resonance coil L3 (3) ~ (6) expression of relation is obtained, Resonant coil L at frequencies f ₄ , f ₅ , f ₆ respectively
The relations of equations (3) to (6) are obtained for 4, L5 and L6.

Thus, in the output signals V _X1 , V _X2 , V _Y1 and V _Y2 ,
By switching the frequency of the drive signal _SD , the position information of the resonance coils L1 to L6 can be sequentially detected as amplitude information.

In this embodiment, the output signals V _X1 , V _X2 , V _Y1
When outputting _VY2 from each of the detection coils 26C, 27C, 28C and 29C, a land for connecting lead wires and one surface of the printed circuit boards 26 to 29 is provided, and a twisted pair wire is connected to the land to output. The output signal
Excitation magnetic field Φ for the lead lines of V _X1 , V _X2 , V _Y1 and V _Y2
Is effectively avoided, and highly accurate coordinate data can be input.

In the two-dimensional coordinate data input device 10, the output signal V
After giving _X1 and _VX2 to the amplifier circuits 40 and 42 to amplify them, they are converted into digital signals by analog digital converters (A / D) 44 and 46. At this time, the output signal _VX1
And so the proportionality constant K ₁₁ and K ₁₂ of V _X2 is equal, via the level correction circuit 48 corrects the signal level of the output signal V _X2.

As a result, via analog-to-digital conversion circuits 44 and 46, K ₁₁ = K ₁₂ = K in equations (3) and (5), and And the output signals V _X3 and V _X4 represented by

The delay circuit 48 with respect to this is a shift register circuit which operates on the basis of the clock signal S _CK and by the series connection a predetermined number, and thereby delays the output signal V _X4 expressed by a sine function, Next formula To an output signal V _X4D represented by the cosine function of

In this way, if the delay circuit is constituted by the shift register circuits connected in series by a predetermined number of stages, the delay time can be switched according to the clock cycle.

Accordance connexion In this embodiment, since the switching frequency of the drive signal S _D is switched to clock frequency, can be to follow the frequency f ₁ ~f ₆ of the drive signal S _D to switch the delay time of the delay circuit thus connexion automatically turn the frequency of the drive signal S _D can also be converted to an output signal V _X4d represented by a cosine function output signal V _X4 in a simple structure, and high accuracy.

The subtraction circuit 50 subtracts the output signal V _X4D from the output signal V _X3 , whereby the following equation is obtained. Resonant coil obtained as amplitude information as expressed by
The position information of L1 to L6 is converted into phase information.

That is, when directly detecting the position information of the resonance coils L1 to L6 from the amplitude information, the output signals V _X1 of the detection coils 26C and 27C are used.
And the amplitude of V _X2 is changed by elements other than the position information of the resonance coils L1 to L6, it is difficult to detect the high accuracy positioning.

However, the amplitude of the output signals V _X1 and V _X2 is
C, 27C and also changes depending on the degree of coupling of the exciting coil 24, for example, a resonant coil connected to a small resistor resistance value at the resonance frequency f _1, which is connected to the high resistance of the resistance value at the resonance frequency f ₁ When the resonance coil and the resonance coil are used alternately, the output signals V _X1 and V _X2 having different amplitudes are obtained even though the resonance coil is mounted at the same position, and in this case, it is difficult to detect correct position information. Become.

However, as in this embodiment, if the position information of the resonance coils L1 to L6 obtained as the amplitude information is converted into the phase information, the phase information can be held so as to change depending only on the position information, and the detection can be performed. Even if the degree of coupling between the coils 26C and 27C and the exciting coil 24 changes, correct position information can be detected.

That subtraction signal S _X odor output from the subtracting circuit 50, since it has a position information of the resonance coils L1~L6 as phase information, the drive signal S _D and the subtraction signal S _X of the exciting coil 24 If the phase comparison result is obtained, the position information of the resonance coils L1 to L6 can be detected.

Thus, by arranging the detection coils 26C and 27C apart by the predetermined distance L / 2, two output signals V _X1 and V _{X2 including} the position information based on the detection coils 26C and 27C as the amplitude information are obtained. it can be selectively extracted by the position information of the resonance coils L1~L6 on the basis of the two output signals V _X1 and V _X2.

In yet amplitude of the subtraction signal S _X, the detection coil 27
Since the resonance frequency changes only by the degree of coupling between C and 28C and the excitation coil 24, it is possible to identify resonance coils connected to resistors having the same resonance frequency and different resistance values (that is, the above-described resonance frequency). a resonant coil connected to a small resistor resistance value at f _1, comprising an identification of the connected resonant coil to a large resistance of the resistance value at the resonance frequency f _1).

In the two-dimensional coordinate data input device 10, the subtraction signal S _X
To the comparison circuits 52 and 54 to detect the position information in the X direction and identify the type of the resonance coils L1 to L6.

Here the comparison circuit 52 receives the reference data D _REF0 representing the zero level signal level, when thereby the signal level of the subtraction signal S _X rises from the zero level, the comparison output signal S
_{It is designed} to launch _COMX .

On the other hand, flip-flop circuits (F / F) 56 and 57
It is adapted to constitute a edge detection circuit together with the AND circuit 58, rises the comparison output signal S _COMX, is adapted to drive the latch 60 by one clock period of the clock signal S _CK.

On the other hand, the latch circuit 60 is an address counter circuit.
Adapted to receive the address data D _ADD output from 15, thereby the address data D _ADD varying accompaniment with sequentially cyclically value to the drive signal S _D of the exciting coil 24, the subtraction signal S _X is 0 level The rise is made to latch at the timing.

Thus the latch circuit 60, the phase of the subtraction signal S _X to the drive signal S _D of the exciting coil 24 is changed, it is possible to obtain a latch result of varying value depending on the phase amount, thus the drive signal a phase comparison result between the S _D and the subtraction signal S _X can be easily obtained.

Thus, in this embodiment, it is adapted to input to the control circuit 11 to latch the address data as coordinate data D _X in the X direction.

As a result, the control circuit 11 can identify the resonance coils L1 to L6 based on the clock frequency at the time of latching, and thus, for each of the resonance coils L1 to L6, the coordinate data in the X direction can be identified.
It can be input D _X.

On the other hand, the comparison circuit 54 has a predetermined comparison reference data D.
The _REF1 receiving with subtraction signal S _X, the signal level of the comparison reference subtraction signal from the signal level determined by the data D _REF1 S _X rises, raises the signal level of the comparison output signal.

The retriggerable mono-multi circuit 62 receives the comparison output signal of the comparison circuit 54, and operates with a time constant determined by the capacitor 63 and the semi-fixed resistor 64.
When the amplitude of S _X increases above a predetermined value, it is adapted to switch the signal level of the output signal S _MOD.

Thus for example instead of the resonance coil L1 to L6, when using a resonant coil connected to different resistance values resistance equal resonance frequency f ₁ ~f _6, change of degree of coupling between the detection coils 26C, 27C and the exciting coil 24 the change in amplitude of the subtraction signal S _K associated with detecting, can switch the signal level of the output signal S _MOD.

Accordingly, movable bodies 35A and 35B on which resonance coils L1 to L6 are arranged
In addition to using simultaneously, coordinate data can be input by selectively using a plurality of movable bodies in which resonance coils having the same resonance frequency f _{1 to} f ₆ are arranged, and for example, display of a handwritten input line drawing according to the type of the movable body By switching the color, thickness, and the like, the usability of the two-dimensional coordinate data input device 10 can be improved.

On the other hand, the amplifier circuits 64 and 66 amplify the output signals _VY1 and _VY2 of the detection coils 28C and 29C, and then convert them into digital signals by the analog digital conversion circuits 68 and 70. The signal level of the output signal _VY2 is corrected via the circuit 69.

As a result, the following equation is obtained through the analog digital conversion circuits 68 and 70, similarly to the output signals V _X1 and V _X2. The output signals _VY3 and _VY4 represented by the following _equations can be obtained.

On the other hand, the delay circuit 72 has the same configuration as the delay circuit 48, thereby delaying the output signal _VY4 represented by the sine function by the following equation. To the output signal _VY4D represented by the cosine function of

Comparison circuit 74, the signal level of the output signal V _Y3 output signal V
_When rising from the _Y4D signal level, the comparison output signal S _COMY
Raise the signal level of

That is, in this embodiment, the coordinate data D _X in the X direction is used.
In obtaining creates a subtraction signal S _X, the subtraction signal S _X is adapted to detect the timing of rises from 0 level.

However in practice subtraction signal S _X, the output signal V _X3
Is generated by subtracting the output signal V _X4D from the output signal V _X4D, and if the timing at which the signal level of the output signal V _X3 rises from the signal level of the output signal V _X4D is detected, the process of generating the subtraction signal S _X is omitted. Te, it is possible to detect the timing at which the subtraction signal S _X rises from the zero level, it is possible to detect the coordinate data at correspondingly simple structure.

Thus, when detecting the Y-direction of the coordinate data is adapted to detect the timing at which the signal level of the output signal V _Y3 rises than the signal level of the output signal V _Y4d the comparator circuit 74, a simple configuration as a whole thereby The coordinate data input device 10 is obtained.

The flip-flop circuits 76 and 77 constitute an edge detection circuit together with the AND circuit 78, and receive the comparison output signal S _COMY output from the comparison circuit 74. When the comparison output signal S _COMY rises, the clock signal S _CK is _generated . The latch circuit 80 is driven for one clock cycle.

Thus the address data D _ADD are latched, it is possible to detect the coordinate data D _Y in the Y direction.

Thus, in the control circuit 11 based on the clock frequency in the latch, resulting identifies the resonance coils L1 to L6, each resonance coil L1 to L6, it is possible to input the coordinate data D _Y in the Y direction.

The control circuit 11, coordinate data D _X in the resonant coil L1~L6 and
From D _Y, the movable body 35A and the coordinate data of the resonance coils L3 and L6
And 35B as coordinate data.

Further, the control circuit 11 uses the following equation: , The vector from the resonance coil 1 to L3 and the vector from the resonance coil L4 to L6 are detected, and the vectors are input as the directions of the movable bodies 35A and 35B. Where (x _1, y ₁₎ is the detected coordinates of the resonance coil _{L1, (x 3, y 3} ) represents the coordinates of the resonance coil L3.

Thus, in the control circuit 11, based on the coordinate data D _X and D _Y of the detected resonance coil L1 to L6, by detecting the position relationship, detecting the coordinate data of the movable body 35A and 35B together with its orientation can do.

Thus, the detection coils 26C, 27C, 28C and 2 are connected to each other so as to cancel out the induced electromotive force at a distance.
Based on the 9C output signals V _X1 , V _X2 , V _Y1 and V _Y2 , movable bodies 35A and 3 on which resonance coils L1 to L6 disturbing the excitation magnetic field Φ are arranged.
Wireless movable body 35A equipped with resonance circuits K1 to K6 capable of detecting the position information of 5B and thus disturbing the excitation magnetic field Φ
, And 35B can be used to input two-dimensional coordinate data, and the usability and reliability can be improved accordingly.

In this embodiment, the address counter circuit 15,
The read-only memory circuit 17, digital-to-analog conversion circuit 19, amplification circuit 21, and level correction circuit 22 include an excitation coil 24.
In contrast to configure the drive signal generating circuit for outputting a drive signal S _D, the control circuit 11 and a clock signal generating circuit 12 constitute a drive signal switching circuit for switching the frequency of the drive signal S _D.

(G3-2) Operation of Embodiment In the above configuration, when an object that disturbs the excitation magnetic field is placed on the plastic cover 32, the detection coils 26C and 27
When the object is located on the central axis O of C, 28C and 29C, the induced electromotive voltages are maintained in a balanced state in each of the detection coils 26C, 27C, 28C and 29C, and the output signals V _X1 , V _X2 ,
V _Y1 and V _Y2 are held at the 0 level.

On the other hand, the object disturbing the exciting magnetic field
When moving in the X and Y directions from the central axis O of C, 27C, 28C, and 29C, the balance of the induced electromotive force is lost in each of the detection coils 26C, 27C, 28C, and 29C, and the output signal varies according to the moving distance x, y.
The signal levels of V _X1 , V _X2 , V _Y1 , and V _Y2 change, whereby the position information of the object is detected as the amplitude information of the output signals V _X1 , V _X2 , V _Y1 , and V _Y2 .

At this time, in the object that disturbs the exciting magnetic field, the movable body 35A and 35B, which respectively comprise a resonant circuit of the resonance frequency f ₁ ~f ₆
Using, by switching the frequency of the drive signal S _D is switched to clock frequency for each predetermined time period, the drive signal S _D
Is held at the resonance frequency of each resonance circuit, the position information of each of the resonance coils L1 to L6 disposed on the movable bodies 35A and 35B as amplitude information of the output signals _VX1 , _VX2 , _VY1 , _VY2. Can be detected.

The output signals V _X1 , V _X2 , V _Y1 , V _Y2 are respectively _supplied to the amplification circuit 4
Analog digital conversion circuit 4 via 0, 42, 64 and 66
4, 46, 68, and 70, and converted into digital output signals V _X3 , V _X4 , V _Y3 , and V _Y4 . At this time, the level correction circuits 48 and 69 output the signals V _X4 and V _Y4 . After the level is corrected, the output signals V _X4 and V _Y4 represented by the sine function are converted into output signals V _X4D and V _Y4D represented by the cosine function by the delay circuits 48 and 72.

Output signals V _X3 and V _X4d is subtracted by the attenuation circuit 50, thereby the position information of the resonance coils L1~L6 obtained as amplitude information is converted into phase information.

Subtraction signal S _X output from the subtracting circuit 50, comparator circuit 52
And a comparison result is obtained with reference data D _REF0 representing a signal level of 0 level, and the comparison output signal S _COMX is output to a latch circuit 60 via an edge detection circuit composed of _flip- flop circuits 56 and 57 and an AND circuit 58. Is done. Thus, the address data D _ADD is latched at the timing when the subtraction signal S _X rises from the 0 level, and the drive signal _SD and the subtraction signal S _X
Phase comparison result between is latched in latch circuit 60, thereby to identify the resonance coil L1~L6 inputs the coordinate data D _X in the X direction based on the clock frequency.

Further, the comparison result of the subtraction signal S _X with predetermined comparison reference data D _REF1 is obtained by the comparison circuit 54, and the comparison output signal is output via the retriggerable mono-multi circuit 62.

If this by example instead of the resonance coil L1 to L6, using a movable member having a connected resonant coil to a large resistance of the resistance values equal the resonant frequency f ₁ ~f _6, the detection coil 26
Subtraction signal due to change in coupling between C and 27C and excitation coil 24
Detects a change in the amplitude of S _X, it is possible to switch the signal level of the output signal S _MOD.

Output signals V _Y3 and V _Y4d contrast, comparison is given to the circuit 74, wherein the output signal V _Y3 signal level output signal V
_The rising timing from the _Y4D signal level is detected.

Comparison output signal S _COMy output from the comparison circuit 74 is output to the latch circuit 80 via the edge detection circuit constituted by flip-flops circuits 76 and 77 and the AND circuit 78, is thereby the signal level of the output signal V _Y3 Address data D at the timing of rising from the signal level of output signal _VY4D
ADD is latched.

Thus by omitting subtraction signal creation process of the output signal V _Y3 and V _Y4d, data representing the phase comparison result of the operation signal and the drive signal S _D is latched to the latch circuit 80, the coordinate data D _Y in the Y-direction Obtainable.

X and Y direction coordinate data of each resonance coil L1 to L6
D _X and D _Y are coordinate data D _X and D _Y of the resonance coils L3 and L6
Is input as the coordinate data of the movable bodies 35A and 35B, and the vector and the resonance coil L4 from the resonance coil L1 to L3.
Vectors toward L6 are input as the directions of the movable bodies 35A and 35B, and the position information of the movable bodies 35A and 35B is input based on the coordinate data of each resonance coil detected thereby.

(G3-3) Effects of the Embodiment According to the configuration described above, the detection coil 26 in which the two coils are connected in an eight-shape so as to cancel out the induced electromotive voltage.
C, 27C, 28C and 29C are arranged at predetermined positions, and the exciting coil 24
In addition to switching the frequency with and exciting, and by assigning the resonance coils L1 to L6 that resonate with the drive frequency of the excitation coil 24 to each of the movable bodies 35A and 35B, the coordinate data of the resonance coils L1 to L6 is detected, Position information consisting of coordinate data and directions of 35A and 35B can be detected.

(G4) Second Embodiment In this embodiment, coordinate data is input using movable bodies 90A to 90N as shown in FIG. 9 instead of the movable bodies 35A and 35B.

That is, in the movable body 90A to 90N, frequencies f _1, f _2,
has three resonant circuits K1, K2, K3 resonating at f _3, the distance L ₁₂ from the resonance circuit K1 to the resonance circuit K2, the distance L ₂₃ from the resonance circuit K2 to the resonance circuit K3, the resonant circuit from resonating circuit K3 distance L ₃₁ to K1 is selected to be different values for each movable body 90A to 90N.

On the other hand, the frequency of the drive signal _SD is the frequency f ₁ , f ₂ ,
It has been made to replace sequentially cut with f _3.

As a result, when the movable bodies 90A to 90N are alternately placed on the tablet 34, the control circuit 11 causes the resonance circuits K1, K2, K3
It is possible to detect the coordinate data D _X and D _Y of the resonance coils L1, L2, L3 of.

The control circuit 11 in this embodiment, on the basis of the coordinate data D _X and D _Y of the detected resonance circuit K1, K2, K3, as well as identifying the movable body 90A~90N placed on tablet 34, the The coordinate data and the orientation of the movable bodies 90A to 90N are detected, so that the coordinate data can be input using the movable bodies 90A to 90N alternately.

That detected resonance coil L1, L2, coordinate data D _X and D _Y of L3, respectively the coordinates _{(x 1, y 1),} (x 2, y 2),
When (x ₃ , y ₃ ) is set, the distances L ₁₂ , L ₂₃ and L ₃₁ are calculated by the following equation: L ₁₂ = [(x ₁ ² −x ₂ ² ) + (y ₁ ² −y ₂ ² )] ^{1 / 2} ...... (15) L ₂₃ = ^{_{[(x 2 2 -x 3 2)}} + (y 2 2 -y 3 2) ] ^1/2 ...... (16) L ₃₁ = [(x ₃ ² -x ₁ ² ) + (Y ₃ ² −y ₁ ² )] ^1/2 ... (17)

Accordingly, each of the movable bodies 90A-9 stored in the memory circuit in advance
Based on the distance L _12, L ₂₃ and L ₃₁ of 0N, it is possible to identify the moving body 90A~90N placed on tablet 34.

Factors such as plurality of resonance to the movable body 90A~90N same circuit K1, K2, and K3 are arranged, the distance L _12, L between the resonance coils
When identifying the placed movable body 90A~90N on tablet 34 on the basis of ₂₃ and L _31, the distance L ₁₂ between the resonance coils, L
Equal ₂₃ and L _31, identification becomes difficult between the movable member arranged a resonant circuit K1, K2, K3 symmetrically.

Accordingly, the control circuit 11 executes the arithmetic processing of the following equation: F = (x ₃ −x ₂ ) y ₁ + (x ₁ −x ₃ ) y ₂ + (x ₂ −x ₁ ) y ₃ (18) Then, the sign of the value F is detected and identified.

Further, the control circuit 11 obtains the following equation from the coordinates (x ₁ , y ₁ ), (x ₂ , y ₂ ), and (x ₃ , y ₃ ) of the resonance coils L1, L2, and L3. Orientation after the coordinate data (x _A, y _A) of the arithmetic processing by executing the centroid was determined as the coordinate data of movable bodies 90A to 90N, a vector from the center of gravity to the resonance coil L1 of the movable body 90A to 90N Enter as

Thus, the distances L ₁₂ and L ₂₃ which are determined by the arrangement relationship between the resonance coils
And based on the L _31, identifies the movable body 90A to 90N, detects the coordinate data and the direction of the movable body 90A to 90N obtained, thereby inputting coordinate data with each movable body 90A to 90N alternately obtain.

According to the above configuration, the resonance coils having the same resonance frequency
L1~L3 different distances L _12, is also possible to use a plurality of movable bodies 90A~90N arranged in L ₂₃ and L _31, the resonant coil
Based on the distance L _12, L ₂₃ and L ₃₁ made in arrangement of L1 to L3, resulting detects the coordinate data and direction to identify the movable body 90A to 90N, thus alternately each movable body 90A to 90N Can be used to enter coordinate data.

(G5) Third Embodiment In this embodiment, as shown in FIG. 10, a resonance circuit is arranged on pieces 95A to 95N of shogi, and pieces 95A to 95N are formed on a tablet 34 processed into a chess board shape. Enter the coordinate data of.

That is, in the pieces 95A to 95N, the resonance circuits K1A to K1N and K2A selected so that the resonance frequencies do not overlap each other.
KK2N, K3AKK3N and 4A〜K4N are assigned so that the pieces 95AA95N can be identified even if they are placed on the tablet 34 at the same time.

That is, in the control circuit 11, by switching the frequency of the drive signal _SD , the opponent side and own side “king general”, the opponent side and own side “jump”,..., The opponent side and own side The coordinate data of the resonance coils assigned to the pieces 95A to 95N of the ninth "step" on the opponent side and on the opponent side are sequentially detected.

Further, in the pieces 95A to 95N, the resonance circuits K1A to K1N, K2A to K2N and K3A to K3N, K4A to K4N
Are assigned, whereby the front and back of the pieces 95A to 95N can be identified to determine whether or not the pieces 95A to 95N have been formed.

Further, in the pieces 95A to 95N, when the pieces 95A to 95N are arranged on the tablet 34, as shown by the arrow a, the resonance circuits K1A to K1N, K2A to K2N and K3A to K3N,
The resonance coils of K4A to K4N are arranged side by side, so that the directions of the pieces 95A to 95N can be detected.

According to the above configuration, the shogi pieces 95A to 95N that are movable bodies
The resonance circuit K1 selected so that the resonance frequency does not overlap
A to K1N, K2A to K2N, K3A to K3N, and K4A to K4N are allocated, and the resonance coils are arranged on the front and back surfaces so as to face the opponent, so that the coordinate data of the pieces 95A to 95N,
The direction and front and back can be entered.

(G6) Other Embodiments In the above-described embodiment, the case where the detection coil is formed by the wiring pattern and the through hole on the printed circuit board has been described. However, the present invention is not limited to this. Alternatively, the detection coil may be formed.

Further, in the above-described embodiment, a case has been described in which the detection coil is created so as to cancel the induced electromotive voltage by connecting the rectangular coil to the figure-eight shape.
The present invention is not limited to this, and a lead wire may be connected to each coil, and the connection may be made in the storage case or on the signal processing circuit side so as to cancel out the induced electromotive force of each coil.

Furthermore, in this case, after amplifying the induced electromotive voltage of each coil, the voltages may be added so as to cancel each other, and furthermore, the asymmetry of each coil shape, the non-uniformity of the excitation magnetic field Φ, etc. are corrected. Is also good.

Further, in the above-described embodiment, a case has been described in which a detection coil is formed by connecting a rectangular coil to a figure-eight shape to separate two coils so that one side of the coil overlaps. The present invention is not limited to this, and the distance to be separated can be freely selected according to the required accuracy of detecting coordinate data.

Further, in the above-described embodiment, the case where the detection coil is formed by connecting a one-turn coil in a rectangular shape has been described. However, the present invention is not limited to this, and various shapes and various windings may be used as necessary. A number of coils can be widely applied.

In this case, with respect to the detection coils 26C and 28C, the distance L / 2
For example, the detection coils 27C and 29C which are arranged only by shifting may be configured as shown in FIG.

That is, the coil 27CL (2
9CL), and the coil 27CR (29CR) is divided and formed on both sides thereof.

The same effect as that of the first embodiment can be obtained by using the detection coil formed as described above.

In order to obtain a wider detection range while maintaining higher detection accuracy, a detection coil having a configuration as shown in FIG. 12 may be used.

That is, in the first detection coil 90, four rectangular coils having a length L of one side are connected sequentially and alternately so as to cancel the induced electromotive force.

On the other hand, the second detection coil 91 has the same shape as the first detection coil 90, and is arranged shifted from the first detection coil 90 by the distance L / 2.

In this way, the connection portions O1, O2 and O3 of each coil
, An output signal whose amplitude changes in accordance with the position of the movable body can be obtained.

Therefore, by combining the detection coils 90 and 91 with the detection coils 92 and 93 of twice the size, the coordinate data can be detected in a wide range.

Further, in the above embodiment, the case where the excitation coil is driven by a sine wave signal has been described. However, the present invention is not limited to this, and various drive signals such as a rectangular wave signal and a triangular wave signal are widely applied as necessary. be able to.

Further, in the above-described embodiment, the case where the resonance coil is arranged in the movable body in a triangular shape or a linear shape has been described. However, the present invention is not limited thereto, and various shapes such as a square shape and a pentagonal shape may be used as necessary. Can be arranged.

Further, in the above-described embodiment, the case where the resonance coil is identified using the difference in the resonance frequency has been described.
The present invention is not limited to this, and when resonance coils having the same resonance frequency are not placed on the tablet at the same time, the difference in current flowing through the resonance coils may be detected to identify the resonance coils.

In other words, if the current flowing through the resonance coil is different, when the excitation coil 24 is driven at the resonance frequency, subtraction signals S _X (FIG. 6) having different signal levels can be obtained.
By using in combination with a resonance coil having a different resonance frequency, more types of movable bodies, their orientations, front and back, and the like can be identified.

Further, in the third embodiment described above, the case where the coordinate data is detected by identifying the front and back of the movable body has been described. However, the present invention is not limited to this. For example, as shown in FIG. The polyhedron 96 may be used, and the coordinate data may be input by identifying the surface facing the tablet surface.

That is, the resonance circuits K1A to K3 are respectively provided on the respective surfaces of the polyhedron 96.
A, K1B to K3B,..., K1L to K3L are assigned.

In this way, the surface facing the tablet surface, its direction and coordinate data can be input based on the coordinate data of the resonance coil obtained by sequentially switching the drive frequency of the exciting coil 24.

Further, in the above-described embodiment, the case where the frequency of the drive signal _SD is switched stepwise has been described. However, the present invention is not limited to this. For example, the clock signal generation circuit is configured by a frequency modulation circuit, and the drive signal _{SD is changed.} May be continuously switched.

By doing so, near the resonance frequency of the resonance coil,
The signal level can be obtained subtraction signal S _X to change rapidly in response to the sharpness Q of the resonance coil.

Therefore, by detecting the change of the subtraction signal S _X ,
The sharpness Q is detected, and the resonance coil is indirectly identified based on the frequency of the drive signal _SD and the output signal of each of the detection coils 26C, 27C, 28C, and 29C, thereby inputting the position information of the movable body. You may do so.

Further, if this arrangement is adopted, the comparison circuit 54 and the rettagable mono-multi circuit 62 can be omitted, and the resonance coil to which resistors having the same resonance frequency and different resistance values are connected can be identified, and the overall configuration can be simplified accordingly. obtain.

Further, in the above-described embodiment, a case has been described in which a delay circuit is configured by cascading shift register circuits. However, the present invention is not limited to this, and the delay circuit may be configured using a memory circuit. .

Further, in the embodiment described above, the output signals V _X4 and V _X4
Has been described, but the present invention is not limited to this, and the output signals V _X3 and V _Y3 may be delayed.

Further, in the above-described embodiment, the case where the output signal of the detection coil is converted into a digital signal and processed is described. However, the present invention is not limited to this, and the processing may be performed as an analog signal.

That is, after amplifying the output signals V _X1 , V _X2 , V _Y1 and V _Y2 , the phase circuit outputs the output signals V _X1 and V _Y1 or the output signal V _X2.
And the phase of _VY2 is delayed by 90 degrees.

Further, after creating a subtraction signal between the output signal of the phase circuit and the output signals _VX2 and _VY2 or the output signals _VX1 and _VY1 , address data is latched at the timing when the subtraction signal rises from the 0 level.

Alternatively, after the signal level of the subtraction signal is corrected to a predetermined reference value, the phase may be compared with the drive signal of the excitation coil using a phase comparator.

With this configuration, the output voltage of the phase comparator can be changed according to the position of the movable body, and thereby, the coordinate data of the movable body can be input.

Further, in the above-described embodiment, the case where the address data is latched at the timing when the subtraction signal rises from the 0 level has been described. However, the present invention is not limited to this, and when the address data is latched at the timing when the subtraction signal falls from the 0 level. When the address data is latched at the timing when the amplitude of the subtraction signal rises or falls to a predetermined signal level after the amplitude of the subtraction signal is corrected to a predetermined value, furthermore, a predetermined value corresponding to the peak value of the subtraction signal is obtained. The address data may be latched at the timing when the subtraction signal rises or falls to the signal level.

Further, in the above-described embodiment, a case has been described in which a movable body having a series resonance circuit to which a resistor is connected is used. However, the movable body is not limited to this, and the resistor may be omitted.

Further, in the above-described embodiment, the case where two-dimensional coordinate data is input has been described. However, the present invention is not limited to this, and can be widely applied to the case where one-dimensional coordinate data is input.

Furthermore, in the above-described embodiment, the case of inputting handwritten characters has been described. However, the present invention is not limited to this. For example, when inputting a figure, various coordinate data are input instead of the conventional coordinate data input means. Can be widely applied to cases.

Further, the ID function for identifying the operator can be obtained by switching not only the coordinate data input means but also the resonance frequency of the resonance coil and the arrangement relation for each movable body held by the individual, so that the password can be assigned to the movable body. It can also be used as an input means having a function.

Further, in this case, the present invention can be widely applied to various input devices such as an electronic lock input device using only the ID function.

In this case, the control circuit may transmit the identification signal of the movable body based on the coordinate data of the resonance coil.

H Advantageous Effects of the Invention As described above, according to the present invention, a movable body having a plurality of resonance circuits each having a different resonance frequency attached to a different position is placed in a uniform exciting magnetic field generated by an exciting coil. By the insertion, the resonance circuit resonating at the frequency of the excitation magnetic field causes an operation to disturb the uniformity of the excitation magnetic field at the insertion position of the resonance circuit performing the resonance operation, and the position where the uniformity is disturbed is determined. , The first detection signal of the first detection means having the first and second coils, and the third and fourth coils with respect to the first and second coils by L / 2 (L is the first, second, third and fourth coils). Phase of the output signal obtained based on the second detection signal of the second detection means superimposed at a position shifted by (the width in the arrangement direction of the second, third, and fourth coils). Is detected as
Thereby, it is possible to form an identification signal that reliably identifies the insertion position of the wireless movable body and the type, orientation, or front and back of the movable body.

[Brief description of the drawings]

1 and 2 are schematic diagrams for explaining the principle of position detection of the present invention, FIG. 3 is a signal waveform diagram for explaining the principle, and FIG.
5 and 5 are connection diagrams for explaining the principle of identifying an object disturbing the exciting magnetic field, FIG. 6 is a block diagram showing a two-dimensional coordinate data input device according to an embodiment of the present invention, and FIG. 7 is a tablet thereof. 8, FIG. 8 is a schematic perspective view showing the movable body, FIG. 9 and FIG. 10 are schematic perspective views showing other embodiments, and FIG. 11 and FIG. FIG. 13 is a schematic perspective view showing another embodiment, and FIG. 13 is a schematic perspective view showing another embodiment of the movable body. 1, 24 ... exciting coil, 4, 5, 26CR, 26CL, 27CR, 27
CL, 28CR, 28CL, 29CR, 29CL ... Coil, 9C, 9D, K1 ~
K4, K1A to K1N, K2A to K2N, K3A to K3N, K4A to K4N ... Resonant circuit, 10 ... Two-dimensional coordinate data input device, 15 ... Address counter circuit, 17 ... Read only memory circuit, 26
C, 27C, 28C, 29C ... Detection coil, 34 ... Tablet,
35A, 35B, 90A-90N, 95A-95N, 96 ... Movable body, 48, 72
... delay circuit, 50 ... subtraction circuit, 52, 54, 74 ... comparison circuit, 60, 80 ... latch circuit. L1, L2, L3 ... Resonant coil.

Claims (2)

(57) [Claims] An exciting coil for generating a uniform exciting magnetic field composed of an alternating magnetic field; a drive signal generating means for supplying a drive signal capable of selectively switching a plurality of frequencies to the exciting coil; First and second coils having a rectangular shape with a width L and having substantially the same configuration are arranged at positions adjacent to each other so as to interlink with the exciting magnetic field,
First detecting means for outputting a first detection signal comprising a difference signal between the induced electromotive voltages obtained from the first and second coils; each of the first detecting means having a rectangular shape having a width L in the arrangement direction and substantially Positions in which the third and fourth coils of the same configuration are adjacent to each other and overlap the first and second coils by L / 2 in the same arrangement direction as the arrangement direction of the first and second coils. , A second detecting means arranged so as to interlink with the exciting magnetic field and outputting a second detection signal consisting of a difference signal between the induced electromotive voltages obtained from the third and fourth coils; Having a plurality of resonant circuits resonating with one of the plurality of frequencies and mounted at different mounting positions from each other;
When the first and second coils and the third and fourth coils are inserted into the exciting magnetic field in a range where they overlap, the resonance circuit has the resonance circuit that resonates with the exciting magnetic field. By performing a resonance operation of the resonance circuit as a condition, a movable body that operates so as to disturb the uniformity of the excitation magnetic field at the inserted position, and a synthesis process of the first and second detection signals, A plurality of output signals having a frequency of the excitation magnetic field, each having a phase shifted by a phase corresponding to a position where the plurality of resonance circuits of the movable body are inserted in the arrangement direction are transmitted. Position signal forming means, based on the plurality of output signals, an insertion position of the movable body, a movable body identification means for identifying the type, orientation or front and back of the movable body and sending an identification signal; Input apparatus characterized by comprising. 2. The plurality of resonance circuits of the movable body each connect a resonance capacitor and a resonance coil excited by the excitation magnetic field, and connect one of the plurality of frequencies of the drive signal.
The input device according to claim 1, wherein the input device resonates one after another.