JP2002297301A - Input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input device which has a simple circuit and is resistant to noise and the operability of which is good. SOLUTION: A detection circuit part 30 consists of transistors TR1, TR2, resistors R1 to R3, a capacitor C1 and a battery 21. In the part 30, a transmission frequency is lowered when a first switch 15 is in an OFF state and the transmission frequency is raised when the first switch 15 is in an ON state. A frequency modulation transmitting circuit part 31 consists of field effect transistors FET1 to FET4, an inverter INV1, an inverter INV2 with hysteresis, capacitors C2 to C9, a resistor R4, a coil 22 and a second switch 18. In the part 31, the period of the variation of the modulation frequency of a pulse wave to be transmitted becomes long when a second switch 18 is in an ON state and the period of the variation of the modulation frequency of the pulse wave to be transmitted becomes short when the second switch 18 is in an OFF state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input device for inputting coordinate data using a wireless or wired pen and tablet.

[0002]

2. Description of the Related Art Conventionally, as in the invention described in Japanese Patent No. 3078383, an X-Y coordinate with respect to a tablet is provided by using a wireless pen having a built-in electromagnetic wave signal generation circuit and a tablet having a coil. There is known a coordinate data input device for inputting position data. In addition, the coordinate data input device and the device for recording / reproducing voice are combined to form a device for recording / reproducing voice in a conference or the like. There has been proposed a device that stores data in association with data, and instructs handwritten data after the meeting to reproduce the corresponding voice.

In the coordinate input device according to the invention described in Japanese Patent No. 3078383, on / off of a switch provided in a wireless pen is detected on a tablet side by changing a frequency of an electromagnetic wave emitted by the wireless pen. It has become. In addition, the pen pressure applied to the tip of a wireless pen is detected by changing the phase angle of electromagnetic waves. In the latter device, the mode is switched by clicking a specific position on the tablet with a pen, and an operation input other than handwriting is performed.

[0004]

However, in the former coordinate input device, the on / off of a switch provided in the wireless pen is detected by changing the frequency of the emitted electromagnetic wave, and the pen pressure applied to the pen tip is changed. However, there is a problem that the detection is made by changing the phase angle of the electromagnetic wave, so that it is susceptible to noise and the like and the circuit becomes complicated. Further, in the latter device, switching between the writing mode and the reproduction mode is performed by clicking a specific position of the tablet with a pen, so that the writing is performed while the voice associated with the stroke data of the writing is re-executed. In such a case, in order to switch the mode, it is necessary to click a specific position of the tablet with a pen, and there is a problem that usability is deteriorated.

The present invention has been made to solve the above problems, and has as its object to provide an input device having a simple circuit, being resistant to noise, and having good operability.

[0006]

According to an aspect of the present invention, there is provided an input device comprising: a pen for transmitting an electromagnetic wave or light or an ultrasonic wave; In an input device including a detection device that detects with sound waves, the pen includes at least two or more switches and different types of modulation units corresponding to the switches, and the detection device includes a detection unit that receives signals from the modulation unit. Different types of detection means for detecting the state of each switch based on electromagnetic waves, light, or ultrasonic waves are provided.

In the input device having this configuration, the pen is provided with at least two switches and different types of modulating means corresponding to the at least two switches, and each modulating means switches to a different type according to the state of the corresponding switch. A modulated electromagnetic wave or light or ultrasonic wave is emitted, and the detection device includes:
Different types of detection means detect the state of each switch based on electromagnetic waves or light or ultrasonic waves from the modulation means.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, one of the at least two switches is configured to detect the pen tip of the pen. It is a first switch for detecting connection / disconnection to / from the device, and the other switch is a second switch having a function different from that of the first switch.

In the input device having this configuration, in addition to the function of the first aspect of the invention, the first switch detects whether the pen tip of the pen touches the detecting device, and the second switch has the function. , Has a function different from that of the first switch.

In the input device according to the third aspect of the present invention, in addition to the configuration of the second aspect, the second switch is a mode changeover switch for switching a mode of the function of the pen. The configuration is characterized by the following.

In the input device having this configuration, in addition to the function of the invention described in claim 2, the second switch can switch the function mode of the pen.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the pen further includes an electromagnetic wave, light, or ultrasonic wave transmitting circuit. The transmitting circuit has a first modulation unit that changes a frequency of an electromagnetic wave, light, or an ultrasonic wave according to a state of the first switch, and the detection device detects that a frequency received from the pen is a predetermined frequency. There is provided first determining means for determining the state of the first switch based on whether the value is higher than a threshold value, whether the frequency is within a predetermined frequency range, or whether the frequency matches a stored frequency.

[0013] In the input device having the above structure, claims 1 to 3 are provided.
In addition to the operation of the invention according to any one of the above, an electromagnetic wave or light or an ultrasonic wave is emitted from the transmission circuit of the pen, and the modulating means of the transmission circuit according to the state of the first switch,
The frequency of the electromagnetic wave or light or ultrasonic wave is changed, and the first judging means of the detecting device determines whether the frequency received from the pen is higher than a predetermined threshold value, is within a predetermined frequency range, or has a stored frequency. Based on whether or not
Judge the state of the switch.

According to a fifth aspect of the present invention, in addition to the configuration of the first to fourth aspects, the pen further includes an electromagnetic wave or light or ultrasonic wave transmitting circuit. The transmission circuit has a second modulation unit that changes a cycle of a change in frequency of an electromagnetic wave or light or an ultrasonic wave according to a state of the second switch, and the detection device includes:
Based on whether the period of the change in the frequency of the electromagnetic wave or light or ultrasonic wave received from the pen is shorter than a predetermined threshold or within a predetermined range or matches the stored period, There is provided second determining means for determining the state of the second switch.

In the input device having the above-mentioned structure, the present invention is characterized in that:
In addition to the operation of the invention described in any one of the above, an electromagnetic wave or light or an ultrasonic wave is emitted from the transmission circuit of the pen, and the second modulating means of the transmission circuit according to the state of the second switch. Changing the cycle of the frequency change of the electromagnetic wave or light or ultrasonic wave, and the second determining means of the detecting device determines whether the cycle of the change of the frequency of the electromagnetic wave or light or ultrasonic wave received from the pen is shorter than a predetermined threshold value The state of the second switch is determined based on whether or not it is within a predetermined range or whether or not it matches the stored cycle.

According to a sixth aspect of the present invention, in addition to the configuration of the first to fourth aspects, the pen further includes an electromagnetic wave, light, or ultrasonic wave transmitting circuit. The transmitting circuit has a third modulation unit that changes a duty ratio of a modulation waveform of an electromagnetic wave or light or an ultrasonic wave according to a state of the second switch, and the detection device receives the signal from the pen. Based on whether the duty ratio of the modulated waveform of the electromagnetic wave or light or ultrasonic wave is greater than a predetermined threshold value, or within a predetermined range, or whether it matches a stored value, A third determination means for determining the state is provided.

According to the input device having the above-mentioned structure, the present invention is characterized in that:
In addition to the operation of the invention described in any one of the above, the transmitting circuit of the pen emits electromagnetic waves or light or ultrasonic waves, and the third modulating means of the transmitting circuit according to the state of the second switch,
The duty ratio of the electromagnetic wave or light or ultrasonic modulation waveform is changed, and the third determination means of the detection device determines whether the duty ratio of the electromagnetic wave or light or ultrasonic modulation waveform received from the pen is larger than a predetermined threshold. A second value based on whether the value is within a predetermined range or matches a stored value.
Judge the state of the switch.

According to a seventh aspect of the present invention, in addition to the configuration of the first aspect, the pen further includes an electromagnetic wave, light or ultrasonic wave transmitting circuit. The transmitting circuit includes: a fourth modulating unit that changes a cycle of a change in frequency of an electromagnetic wave or light or an ultrasonic wave according to a state of the first switch; and an electromagnetic wave according to a state of the second switch. Or a fifth modulating means for changing a duty ratio of a modulated waveform of light or ultrasonic waves, wherein the detecting device is configured such that a period of a change in frequency of electromagnetic waves or light or ultrasonic waves received from the pen is higher than a predetermined threshold value. Fourth determining means for determining a state of the first switch based on whether the period is short or within a predetermined range or whether the period matches a stored period; and an electromagnetic wave received from the pen. Or light or ultrasonic Determining a state of the second switch based on whether a duty ratio of the modulation waveform is greater than a predetermined threshold, within a predetermined range, or matching a stored value; Judgment means.

In the input device having this configuration, claims 1 to 3 are provided.
In addition to the operation of the invention described in any one of the above, an electromagnetic wave or light or an ultrasonic wave is emitted from the transmitting circuit of the pen, and the fourth modulating means of the transmitting circuit transmits the electromagnetic wave according to the state of the first switch. Alternatively, the frequency of the change of the frequency of the light or the ultrasonic wave is changed, and the fifth modulation unit changes the duty ratio of the modulation waveform of the electromagnetic wave or the light or the ultrasonic wave in accordance with the state of the second switch, and The fourth determination means determines whether the period of the change in the frequency of the electromagnetic wave, light, or ultrasonic wave received from the pen is shorter than a predetermined threshold value, is within a predetermined range, or matches the stored period. The fifth switch determines the state of the first switch based on whether or not the duty ratio of the electromagnetic wave or light or ultrasonic wave received from the pen is greater than a predetermined threshold, or determines whether the duty ratio is greater than a predetermined threshold. Or not within the range Based on whether match the value, to determine the state of the second switch.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

First, the configuration of an input device 1 according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing an external configuration of a wireless pen 2 and a tablet 3 constituting the input device 1, and FIG. 2 is a block diagram showing a mechanical and electrical configuration inside the wireless pen 2. 3 is a circuit diagram of the wireless pen 2 of the first embodiment, FIG. 4 is a circuit diagram of the wireless pen 2 of the second embodiment, and FIG. 5 is a circuit diagram of the wireless pen 2 of the third embodiment. FIG. 6 is a circuit diagram of the wireless pen 2, FIG. 6 is a diagram showing a modulation waveform of an electromagnetic wave emitted by the wireless pen 2 of the first embodiment, and FIG. 7 is a diagram of the wireless pen 2 of the second embodiment. FIG. 8 is a diagram showing a modulated waveform of an emitted electromagnetic wave, FIG. 8 is a diagram showing a modulated waveform of an electromagnetic wave emitted by the wireless pen 2 according to the third embodiment, and FIG. 9 is a block diagram showing an electrical configuration of the tablet 3 FIG.

As shown in FIGS. 1 and 9, the input device 1
Is composed of a wireless pen 2 for transmitting electromagnetic waves and a tablet 3 for receiving the electromagnetic waves with a built-in coil,
The tablet 3 includes a housing 4, a recording sheet 5 provided at the center of the housing 4, a microphone 6 provided in the housing 4 for inputting sound, and a speaker 7 for emitting reproduced sound. Note that inside the portion where the recording paper 5 is placed,
An electromagnetic wave detection coil described later is provided. In the present embodiment, from the tip of the wireless pen 2,
It is configured to output a pulse wave modulated in a predetermined manner. The tablet 3 functions as a magnetically coupled tablet. Therefore, when the user uses the wireless pen 2 to bring the tip of the wireless pen 2 into contact with the recording paper 5,
The coordinate data of the position designated by the tip is recorded by the magnetically coupled tablet 3. When the tablet 3 is set to the recording mode and the handwritten character is input to the recording paper 5 using the wireless pen 2, the tablet 3 is associated with the stroke data of the handwritten character.
The voice data input to the microphone 6 is digitally recorded. Also, when the tip of the wireless pen 2 is brought into contact with the handwritten characters recorded on the recording paper 5 while the tablet 3 is in the reproduction mode, voice data corresponding to the stroke data of the handwritten characters is reproduced. I have.

Next, referring to FIG.
The structure of will be described. As shown in FIG. 2, the wireless pen 2 is provided with a cylindrical grip 10, a pen core operating cylinder 12 is provided in the center of the grip 10, and the pen core operating cylinder 12 has The pen core 11 urged by the spring 14 toward the tip of the wireless pen 2 (downward in FIG. 2) is provided. An operation knob 13 is fixed to an upper part of the side surface of the pen core operation tube 12, and the operation of the operation knob 13 allows the pen core operation tube 12 to move up and down in the grip portion 10. When the operation knob 13 is moved in the direction of the arrow A shown in FIG. 2, the tip 11 a of the pen core 11 projects from the tip 10 a of the wireless pen 2, and the operation knob 13
Is moved in the direction indicated by the arrow A shown in FIG. 2, the tip 11 a of the pen core 11 is partially stored in the tip 10 of the gripper 10. The tip 11 a of the wireless pen 2 slightly protrudes from the tip 10 a of the wireless pen 2. The tip 11a of the pen core 11 is
It is possible to write on ordinary paper, such as a pencil, mechanical pencil, ballpoint pen, or felt-tip pen, and to draw characters, figures, symbols, and the like on the recording paper 5. In addition, a projection 17 for operating a second switch 18 described later is provided at the upper end of the pen core operation cylinder 12.

A coil 22 is provided on the tip side of the pen core 11, and the coil 22 is connected to the transmitting circuit board 20,
The electromagnetic wave from the transmission circuit board 20 is transmitted from the coil 22. The transmitting circuit board 20 has
A battery 21 for supplying power to the transmitting circuit board 20 is connected. Further, an arm 16 is fixed to the pen core 11, and a first switch 1, which will be described later, is provided at the tip of the arm 16.
5 is provided with a protrusion 16a.

Next, the first switch 15 and the second switch 18 will be described. The first switch 15 and the second switch 18 are both connected to the transmitting circuit board 20. The first switch 15 includes a contact 15b and a contact 15c.
Is provided with a projection 15a which comes into contact with the projection 16a provided on the second side. When the tip 11a of the pen core 11 comes into contact with the recording paper 5 of the tablet 3, the pen core 11 moves in the pressing direction of the arrow B shown in FIG. The protrusion 16a pushes up the protrusion 15a of the first switch 15, the contact 15b is separated from the contact 15c, and the first switch 15 is turned off (hereinafter, referred to as "OFF state"). When the tip 11a of the pen core 11 separates from the recording paper 5 of the tablet 3, the pen core 11 is moved by the urging force of the spring 14 as shown in FIG.
, The projection 16a of the arm 16 fixed to the pen core 11 separates from the projection 15a of the first switch 15, and the contact 15b and the contact 15 come into contact with each other. The switch 15 is in a connected state (hereinafter, referred to as an “ON state”).

The second switch 18 has a contact 18a
When the operation knob 13 is moved in the direction of the arrow A shown in FIG. 2, the pen lead operation cylinder 12 moves in the direction of the arrow A, and the second switch 18 is turned on.
Contact 18b is separated from contact 18a, and the second switch 1
8 is in the OFF state. In this state, as shown in FIG. 2, the tip 11a of the pen core 11 projects from the tip 10a of the wireless pen 2. The operation knob 13
Is moved in the direction indicated by the arrow A shown in FIG. 2, the pen lead operating tube 12 moves in the direction indicated by the arrow A, and the contact 18a of the second switch 18 is moved to the upper end of the pen lead operating tube 12. The contact 18a of the second switch 18 comes into contact with the contact 18b, and the second switch 1
8 is turned on.

Next, the electric circuit configuration of the wireless pen 2 and the modulated waveform of the transmitted electromagnetic wave will be described with reference to FIGS. The transmitting circuits shown in FIGS.
Except for the first switch 15, the second switch 18, the battery 21, and the coil 22, they are formed on the transmission circuit board 20 shown in FIG. First, a transmission circuit of the wireless pen 2 according to the first embodiment will be described with reference to FIG.

The electric circuit of the first embodiment of the wireless pen 2 is, as shown in FIG.
A detection circuit section 30 for detecting the N.OFF state and controlling the power supply of the circuit;
A frequency modulation transmission circuit unit 31 that changes the period of the change of the modulation frequency of the pulse wave to be transmitted depending on the OFF state.
It is composed of The detection circuit unit 30 includes an NPN transistor TR1 and a PNP transistor TR2.
And a resistor R1, R2, R3, a capacitor C1, and a battery 21.
A first switch 15 is provided between the base of the
When the first switch 15 is OFF, the transistor TR
The base frequency of the transistor TR1 is grounded by the grounding of the transistor TR1 when the first switch 15 is in the ON state, so that the transmission frequency increases.

The frequency modulation transmission circuit section 31 includes field effect transistors FET1, FET2, FET3, FE
T4, an inverter INV1, an inverter INV2 with hysteresis, and capacitors C2, C3, C4, C
5, C6, C7, C8, C9, resistor R4, coil 2
2 and a second switch 18, wherein the second switch 18 is provided between the capacitor C9 connected to the inverter INV2 with hysteresis and the ground, and the second switch 18 is turned on. In this state, the capacitor C9 is grounded and connected in parallel with the capacitor C8, the period of the change in the modulation frequency of the pulse wave to be transmitted becomes longer, and the capacitor C9 is disconnected from the ground when the second switch 18 is OFF. Therefore, the period of the change of the modulation frequency of the transmitted pulse wave is shortened.

With respect to the modulated waveform of the electromagnetic wave transmitted from the transmitting circuit of the first embodiment configured as described above,
This will be described with reference to FIG. This electromagnetic wave is generated by FSK (Freq
uency Shift Keying) is modulated.

Operation knob 1 of wireless pen 2 shown in FIG.
3 in the direction of the arrow A, and
a is projected from the tip 10a of the wireless pen 2, and the tip 11a is brought into contact with the recording paper 5 to apply writing pressure.
Switch 15 and the second switch 18 are both OF switches
The state becomes the F state. In this state, the electromagnetic wave P1 having a low frequency and a short cycle of frequency change is output from the coil 22 in the distal end portion 10a of the wireless pen 2 as shown from timing T0 to T1 in FIG.

Next, when the tip 11a of the wireless pen 2 is separated from the recording paper 5 at timing T1, the first switch 15 is turned on, and the second switch 18 is turned off.
It remains in the state. In this state, the coil 22 in the tip portion 10a of the wireless pen 2 outputs T2 from T1 in FIG.
As shown in the timing, an electromagnetic wave P2 having a high frequency and a short cycle of frequency change is output.

Next, at time T2, the operation knob 13 of the wireless pen 2 is moved in the direction indicated by the arrow A, and the tip 11a of the pen core 11 is stored in the tip 10a of the wireless pen 2. The switch 18 is turned on,
The first switch 15 remains ON. In this state, the electromagnetic wave P3 having a high frequency and a long cycle of frequency change is output from the coil 22 in the distal end portion 10a of the wireless pen 2 as shown from timing T2 to T3 in FIG.

Next, when the tip 11a of the wireless pen 2 is pushed in at timing T3, the first switch 15
In the FF state, the second switch 18 remains in the ON state, and the coil 22 in the tip 10a of the wireless pen 2 receives a low frequency from the coil T3 to T4 in FIG. An electromagnetic wave P4 having a long cycle is output.

Next, referring to FIG.
The transmitting circuit according to the second embodiment will be described.

The electric circuit of the wireless pen 2 according to the second embodiment, as shown in FIG.
A detection circuit unit 34 for detecting the N / OFF state and a frequency duty ratio modulation transmission circuit unit 35 for changing the duty ratio of the modulation frequency of the transmitted pulse wave according to the ON / OFF state of the second switch 18. It is configured. The detection circuit section 34 includes an NPN transistor TR2
1, a PNP transistor TR22, and a resistor R2
1, R22, R23, capacitor C21, battery 21
A first switch 15 is provided between the base of the transistor TR21 and the ground, and when the first switch 15 is in the OFF state, the transistor TR2
The base frequency of the transistor TR21 is grounded and the transmission frequency is increased when the first switch 15 is ON and the base of the transistor TR21 is grounded.

Further, the frequency duty ratio modulation transmission circuit section 35 includes field effect transistors FET21 and FET2.
2, FET23, FET24 and inverter INV21
And an inverter INV22 with hysteresis and capacitors C22, C23, C24, C25, C26, C2
7, C28, resistors R24, R25, R26, coil 22, second switch 18, and diodes D11, D11.
And a second switch 18 connected in series with the resistor R25 connected to the inverter INV22 with hysteresis, and the resistor R25 is connected in parallel to the resistor R26 to transmit. The duty ratio of the pulse wave is reduced, the resistor R25 is connected in parallel with the resistor R24 when the second switch 18 is ON, and the duty ratio of the pulse wave to be transmitted is increased.

With respect to the modulated waveform of the electromagnetic wave transmitted from the transmitting circuit of the second embodiment configured as described above,
This will be described with reference to FIG. The waveform of this electromagnetic wave is FSK
Modulation.

Operation knob 1 of wireless pen 2 shown in FIG.
3 in the direction of the arrow A, and
a is projected from the tip 10a of the wireless pen 2, and the tip 11a is brought into contact with the recording paper 5 to apply writing pressure.
Switch 15 and the second switch 18 are both OF switches
The state becomes the F state. In this state, the electromagnetic wave P11 having a low frequency and a small duty ratio is output from the coil 22 in the distal end portion 10a of the wireless pen 2 as shown from timing T0 to T1 in FIG.

Next, when the tip 11a of the wireless pen 2 is separated from the recording paper 5 at the timing T1, the first switch 15 is turned on, and the second switch 18 is turned off.
It remains in the state. In this state, the coil 22 in the tip portion 10a of the wireless pen 2 outputs T2 from T1 in FIG.
As shown in the timing, an electromagnetic wave P12 having a high frequency and a small duty ratio is output.

Next, at time T2, the operation knob 13 of the wireless pen 2 is moved in the direction indicated by the arrow A, and the tip 11a of the pen core 11 is stored in the tip 10a of the wireless pen 2. The switch 18 is turned on,
The first switch 15 remains ON. In this state, the electromagnetic wave P13 having a high frequency and a large duty ratio is output from the coil 22 in the distal end portion 10a of the wireless pen 2 as shown from timing T2 to T3 in FIG.

Next, when the tip 11a of the wireless pen 2 is pushed in at timing T3, the first switch 15
In the FF state, the second switch 18 is kept in the ON state, and the frequency is low and the duty ratio is large from the coil 22 in the tip 10a of the wireless pen 2 as shown in the timing T3 to T4 in FIG. An electromagnetic wave P14 is output.

Next, referring to FIG.
The transmitting circuit according to the third embodiment will be described.

As shown in FIG. 5, the electric circuit of the third embodiment of the wireless pen 2 is
A detection circuit unit 32 that detects the N / OFF state and a frequency duty ratio modulation transmission circuit unit 33 that changes the duty ratio of the modulation frequency of the transmitted pulse wave according to the ON / OFF state of the second switch 18 It is configured. The detection circuit unit 32 includes an NPN transistor TR1
1, a PNP transistor TR12, and a resistor R1
1, R12, R13, capacitor C11, battery 21
A first switch 15 is provided between the base of the transistor TR21 and the ground, and when the first switch 15 is in the OFF state, the transistor TR2
The period of the change of the modulation frequency of the pulse wave transmitted without the ground of the first base becomes longer, and the first switch 15 is turned on.
In this state, the base of the transistor TR11 is grounded,
The period of the change of the modulation frequency of the transmitted pulse wave is shortened.

Further, the frequency duty ratio modulation transmission circuit section 33 includes field effect transistors FET11, FET1
2, FET13, inverter INV11, inverter INV12 with hysteresis, capacitor C12,
C13, C14, C15, C16, C17 and a resistor R1
4, R15, R16, a coil 22, a second switch 18, and diodes D1 and D2, and a second circuit connected in series to a resistor R15 connected to an inverter INV12 with hysteresis. When the switch 18 is in the OFF state, the resistor R15 is connected in parallel to the resistor R16, the duty ratio of the transmitted pulse wave is reduced, and when the second switch 18 is in the ON state, the resistor R15 is connected in parallel to the resistor R14. , The duty ratio of the transmitted pulse wave is increased.

With respect to the modulated waveform of the electromagnetic wave transmitted from the transmitting circuit of the third embodiment configured as described above,
This will be described with reference to FIG. The waveform of this electromagnetic wave is FSK
Modulation.

Operation knob 1 of wireless pen 2 shown in FIG.
3 in the direction of the arrow A, and
a is projected from the tip 10a of the wireless pen 2, and the tip 11a is brought into contact with the recording paper 5 to apply writing pressure.
Switch 15 and the second switch 18 are both OF switches
The state becomes the F state. In this state, the electromagnetic wave P21 having a long cycle of frequency change and a small duty ratio is output from the coil 22 in the distal end portion 10a of the wireless pen 2 as shown from timing T0 to T1 in FIG.

Next, when the tip 11a of the wireless pen 2 is separated from the recording paper 5 at timing T1, the first switch 15 is turned on, and the second switch 18 is turned off.
It remains in the state. In this state, the coil 22 in the tip portion 10a of the wireless pen 2 outputs T2 from T1 in FIG.
As shown in the timing, the cycle of frequency change is short,
An electromagnetic wave P22 having a small duty ratio is output.

Next, at time T2, the operation knob 13 of the wireless pen 2 is moved in the direction indicated by the arrow A, and the tip 11a of the pen core 11 is stored in the tip 10a of the wireless pen 2. The switch 18 is turned on,
The first switch 15 remains ON. In this state, an electromagnetic wave P23 having a short cycle of frequency change and a large duty ratio is output from the coil 22 in the distal end portion 10a of the wireless pen 2 as shown from timing T2 to T3 in FIG.

Next, when the tip 11a of the wireless pen 2 is pushed in at timing T3, the first switch 15
In the FF state, the second switch 18 remains in the ON state, and the cycle of the frequency change is long from the coil 22 in the tip portion 10a of the wireless pen 2 as shown from the timing T3 to T4 in FIG. An electromagnetic wave P24 having a large duty ratio is output.

Next, an electric circuit configuration of the tablet 3 will be described with reference to FIG. FIG. 9 is a block diagram illustrating an electric circuit configuration of the tablet 3.

The tablet 3 has a coordinate detecting section 40 for detecting the position of the tip 11a of the pen core 11 of the wireless pen 2 provided below the recording paper 5 shown in FIG. It comprises a demodulation unit 41 and a control unit 42. The coordinate detection unit 40 includes a plurality of coils connected to the X-axis multiplexer 44 and a plurality of coils connected to the Y-axis multiplexer 43, and determines the position of the tip 11a of the pen core 11 of the wireless pen 2 using electromagnetic waves. It can be detected as XY coordinate data.

The data demodulating section 41 is provided with a coordinate detecting section 4.
0 X-axis multiplexer 44 and Y-axis multiplexer 4
3, a multiplexer 45 to which the received signal is input, an amplifier circuit 46 for the received signal, and a demodulator circuit 4 for performing amplitude detection and frequency detection on the output signal from the amplifier circuit 46 to demodulate the output signal.
7 and an A / D converter 48 for digitizing the demodulated signal output from the demodulation circuit 47.

Further, the control unit 42 has a CPU 50 for controlling the tablet 3 and an RA for temporarily storing data.
M51, a ROM 52 storing a control program executed by the CPU 50, a threshold value, and the like, a non-volatile memory 54 such as a flash memory storing stroke data and voice data of input handwritten characters, and data from the data demodulation unit 41. And an I / O interface 53 for mediating data with the audio circuit 55 and an audio circuit 55 for converting the input audio from the microphone 6 into digital data and for driving the speaker 7 to generate audio data. It is composed of Accordingly, the stroke data written on the recording paper 5 by the wireless pen 2 is added to the audio data input to the microphone 6, and time data is added to the stroke data, and the stroke data is stored in the nonvolatile memory 54. I have.

Next, the operation of the tablet 3 will be described with reference to FIGS. FIG. 10 is a flowchart of a main control program executed by the CPU 50 of the control unit 42 of the tablet 3, and FIG. 11 is data showing an example of coil scan data in the coordinate detection unit 40.
FIG. 12 is a flowchart of a subroutine for judging the state of the pen when the transmission circuit of the first embodiment shown in FIG. 3 is used, and FIG. 13 is a transmission circuit of the second embodiment shown in FIG. FIG. 14 is a flowchart of a pen state determination subroutine in the case of using the pen, and FIG. 14 is a flowchart of a pen state determination subroutine in the case of using the transmission circuit of the third embodiment shown in FIG.

As shown in FIG. 10, when the tablet 3 is operated, first, a coil scan of the coordinate detector 40 provided below the recording paper 5 is started (S1). The coordinate detection unit 40 detects a coil scan data waveform as shown in FIG. 11 as a result of the amplitude detection. Maximum value Dma of voltage value of detected coil scan data waveform
If x is equal to or smaller than the predetermined threshold Dth stored in the ROM 52 (S2: NO),
Since it is determined that there is no wireless pen 2 (S3), S
Then, the process returns to the first coil scan process. Maximum value Dmax of voltage value of detected coil scan data waveform
Is larger than the predetermined threshold Dth stored in the ROM 52 (S2: YES), the position of the wireless pen 2 is determined because the wireless pen 2 is present near the tablet 3 (S4). . In this process, the position is determined based on the XY coordinate data of the wireless pen 2 on the coordinate detection unit 40.

Next, the state of the wireless pen 2 is determined (S5). The state determination process of the wireless pen 2 performs one of the determination processes in FIGS. 12 to 14 according to the structure of the transmission circuit of the wireless pen 2. First, the state determination of the wireless pen 2 when the transmitting circuit of the first embodiment shown in FIG. 3 is used will be described with reference to a flowchart shown in FIG. 12 and a waveform diagram of electromagnetic waves shown in FIG.

The wireless pen 2 has a built-in transmission circuit of the first embodiment shown in FIG.
When an electromagnetic wave having the waveform shown in FIG. 6 is transmitted according to the ON / OFF state of the fifth switch 18 and the second switch 18, the subroutine of the flowchart determination processing shown in FIG. 12 is used. First, in the pen state determination processing, the average value favg of the carrier frequency of the electromagnetic wave detected by the frequency detection in the tablet 3 coordinate detection unit 40 is 450.
It is determined whether the frequency is lower than kHz (S11). When the average value favg of the frequency is 450 kHz or less (the case of P1 and P4 shown in FIG. 6) (S11: NO), the first switch of the wireless pen 2 is turned off, that is, the tip 11a of the pen core 11 is turned off. Pressed (contacting recording paper 5)
If the average frequency favg is higher than 450 kHz (P2 and P3 shown in FIG. 6) (S11: YES), the first switch is turned ON, that is, the wireless pen Tip 11 of pen core 11 of 2
a can be determined to be separated from the recording paper 5 (S1).
2).

Next, it is determined whether or not the modulation frequency of the sub-carrier of the electromagnetic wave detected by the tablet 3 coordinate detecting section 40 is higher than 5 kHz (whether or not the frequency change cycle is shorter than a predetermined threshold) (S14). . When the modulation frequency of the subcarrier is higher than 5 kHz (in the case of P1 and P2 shown in FIG. 6) (S14: YES), the second switch of the wireless pen 2 is turned off, that is, the tip 11a of the pen core 11
Can be determined (S15). When the modulation frequency of the subcarrier is 5 kHz or less (P3 and P4 shown in FIG. 6) (S14: NO), the second switch is turned on, that is, the tip of the pen core 11 of the wireless pen 2 It can be determined that 11a is stored (S16). Thus, the pen state determination is completed, and the process returns to S1 of the main routine shown in FIG.

Next, with reference to the flowchart shown in FIG. 13 and the waveform diagram of the electromagnetic waves shown in FIG. 7, the determination of the state of the wireless pen 2 when the transmitting circuit of the second embodiment shown in FIG. 4 is used. explain.

The wireless pen 2 incorporates the transmitting circuit of the second embodiment shown in FIG.
If the electromagnetic wave having the waveform shown in FIG. 7 is transmitted according to the ON / OFF state of the fifth switch 18 and the second switch 18, the subroutine of the flowchart determination processing shown in FIG. 13 is used. First, in this pen state determination processing, it is determined whether or not the average value favg of the carrier frequency of the electromagnetic wave detected by the tablet 3 coordinate detection unit 40 is 450 kHz or less (S21). Average frequency favg is 450k
In the case where the frequency is equal to or lower than the Hz (the case of P11 and P14 shown in FIG. 7) (S21: NO), the first switch of the wireless pen 2 is OFF, that is, the tip 11a of the pen core 11 is pressed (recording) (Contact with paper 5) (S23), and the average frequency favg is 450 kHz.
If it is higher (the case of P12 and P13 shown in FIG. 7) (S21: YES), the first switch is turned on,
That is, it can be determined that the tip 11a of the pen core 11 of the wireless pen 2 is separated from the recording paper 5 (S22).

Next, it is determined whether or not the duty ratio of the subcarrier of the electromagnetic wave detected by the tablet 3 coordinate detector 40 is larger than 0.5 (S24). When the duty ratio of the subcarrier is larger than 0.5 (see P13 and P14 shown in FIG. 7)
) (S24: YES), the second switch of the wireless pen 2 is turned on, that is, the tip 1 of the pen core 11
It can be determined that 1a is stored (S26). Also,
When the duty ratio of the subcarrier is less than 0.5 (in the case of P11 and P12 shown in FIG. 7), (S24: N
O), it can be determined that the second switch is OFF, that is, the tip 11a of the pen core 11 of the wireless pen 2 is out (S25). Thus, the pen state determination is completed, and FIG.
The process returns to S1 of the main routine shown in FIG.

Next, with reference to the flowchart shown in FIG. 14 and the waveform diagram of the electromagnetic waves shown in FIG. 8, the determination of the state of the wireless pen 2 when the transmitting circuit of the third embodiment shown in FIG. 5 is used. explain.

The wireless pen 2 incorporates the transmitting circuit of the third embodiment shown in FIG.
When the electromagnetic wave having the waveform shown in FIG. 8 is transmitted according to the ON / OFF state of the fifth switch 18 and the second switch 18, the subroutine of the flowchart determination processing shown in FIG. 14 is used. First, in the pen state determination process, whether the modulation frequency of the subcarrier of the electromagnetic wave detected by the tablet 3 coordinate detection unit 40 is higher than 5 kHz (whether the frequency change cycle is shorter than a predetermined threshold) Is determined (S31). When the modulation frequency of the subcarrier is higher than 5 kHz (in the case of P22 and P23 shown in FIG. 8) (S31: YES), the first switch of the wireless pen 2 is turned on, that is, the tip of the pen core 11 It can be determined that 11a is separated from the recording paper 5 (S32). Also,
When the modulation frequency of the subcarrier is 5 kHz or less (in the case of the states P21 and P24 shown in FIG. 7), (S31: N
O), it can be determined that the first switch of the wireless pen 2 is OFF, that is, the tip 11a of the pen core 11 is pressed (contact with the recording paper 5) (S33).

Next, it is determined whether or not the duty ratio of the sub-carrier of the electromagnetic wave detected by the tablet 3 coordinate detector 40 is larger than 0.5 (S34). When the duty ratio of the subcarrier is larger than 0.5 (see P23 and P24 shown in FIG. 8)
) (S34: YES), the second switch of the wireless pen 2 is turned on, that is, the tip 1 of the pen core 11
It can be determined that 1a is stored (S36). Also,
When the duty ratio of the subcarrier is less than 0.5 (in the case of the states of P21 and P22 shown in FIG. 8) (S34: N
O), it can be determined that the second switch is OFF, that is, the tip 11a of the pen core 11 of the wireless pen 2 is out (S35). Thus, the pen state determination is completed, and FIG.
The process returns to S1 of the main routine shown in FIG.

The above S11, S14, S21, S3
The determination process of (1) determines whether the frequency is within a predetermined frequency range or not.
The determination may be based on whether or not the frequency matches the frequency stored in M52. Further, the above-described determination processing in S24 and S34 determines whether the duty ratio is within a predetermined range or not.
Alternatively, the determination may be made based on whether the duty ratio matches the duty ratio stored in No. 2.

As described above, in the input device 1 of the above embodiment, the first switch 15 of the wireless pen 2
The state of the second switch 18 and the state of the second switch 18 can be accurately determined by the tablet 3 using electromagnetic waves transmitted from a simple transmitting circuit provided in the wireless pen 2. Further, if the circuits of the first to third embodiments are used as the oscillation circuit,
The circuit configuration is simple and the design is easy. In addition, if the transmission circuit of the third embodiment is used, the carrier has a constant frequency, so that noise and the like can be easily removed by using a band-pass filter.

In the above embodiment, it is possible to switch modes such as recording and reproduction of audio data based on the determination of the states of the first switch 15 and the second switch 18. For example, by operating the operation knob 13,
When the tip 11a of the pen core 11 is pulled out, the second switch
When the tip 11a of the pen core 11 is retracted by operating the operation knob 13, the second switch is turned ON. When the tip 11a of the pen core 11 contacts the recording paper 5, the first switch 15 is turned on. OFF, pen lead 1
When the leading end 11a of the first switch 11 is separated from the recording paper 5, the first switch 15 is turned on. Therefore, in association with the ON / OFF of the first and second switches, recording / playback / pause / playback stop / speech speed conversion is performed. Etc. can be switched.

Further, it goes without saying that the present invention can be variously modified without being limited to the above embodiment. For example, the light emitted from the wireless pen 2 is not limited to electromagnetic waves, and the light is modulated and emitted using an infrared light emitting diode or the like. Position and first and second
May be detected. Also,
The wireless pen 2 may be configured to emit ultrasonic waves. In the tablet 3, a plurality of microphones are arranged, and the position of the wireless pen 2 is detected based on the difference in arrival time of the ultrasonic waves. The state of the plurality of switches is determined by the frequency, modulation frequency, and duty of the ultrasonic waves. To communicate. The electromagnetic wave emitted from the wireless pen 2 is not limited to FSK modulation, but may be FM modulation, ASK modulation, PSK modulation, or the like. Further, the pen is not limited to the wireless type, and a wired type pen may be used.

[0070]

As described above, in the input device according to the first aspect of the present invention, the pen is provided with at least two switches and different types of modulation means corresponding to the switches. An electromagnetic wave or light or an ultrasonic wave modulated to a different type according to the state of the corresponding switch is emitted, and the detecting device uses different types of detecting means based on the electromagnetic wave or the light or the ultrasonic wave from the modulating means. The state of each switch can be detected. Therefore, at least two switch states provided on the pen can be detected with a simple circuit configuration.

In the input device according to the second aspect of the present invention, in addition to the effect of the first aspect, the first switch detects whether or not the pen tip of the pen touches the detecting device. The second switch has a different function from the first switch.

In the input device according to the third aspect, in addition to the effect of the second aspect, the second switch can switch the mode of the function of the pen. Therefore, by detecting the state of the second switch, it is possible to perform processing according to the function of the pen.

In the input device according to the fourth aspect of the present invention, in addition to the effects of the first to third aspects, an electromagnetic wave, light, or ultrasonic wave is emitted from the pen transmission circuit. The modulating means of the transmitting circuit changes the frequency of the electromagnetic wave or light or ultrasonic wave according to the state of the first switch, and the first judging means of the detecting device judges that the frequency received from the pen is a predetermined threshold. The state of the first switch can be determined based on whether it is higher, whether it is within a predetermined frequency range, or whether it matches a stored frequency.

In the input device according to the fifth aspect of the present invention, in addition to the effect of the invention according to any one of the first to fourth aspects, an electromagnetic wave or light or an ultrasonic wave is emitted from the transmission circuit of the pen. The second modulating means of the transmitting circuit changes the frequency of the frequency of the electromagnetic wave or the light or the ultrasonic wave according to the state of the second switch, and the second judging means of the detecting device receives the signal from the pen. Based on whether the cycle of the change in the frequency of the electromagnetic wave or light or ultrasonic wave is shorter than a predetermined threshold, within a predetermined range, or whether it matches the stored cycle, The condition can be determined.

Further, in the input device according to the sixth aspect of the present invention, in addition to the effect of the invention according to any one of the first to fourth aspects, an electromagnetic wave or light or an ultrasonic wave is emitted from the transmission circuit of the pen. The third modulating means of the transmitting circuit changes the duty ratio of the modulated waveform of the electromagnetic wave or light or ultrasonic wave according to the state of the second switch, and the third judging means of the detecting device receives the signal from the pen. Based on whether the duty ratio of the modulated wave of the electromagnetic wave, light, or ultrasonic wave is greater than a predetermined threshold value, is within a predetermined range, or matches a stored value, the second switch The condition can be determined.

According to the input device of the present invention, in addition to the effect of any one of the first to third aspects, an electromagnetic wave or light or an ultrasonic wave is emitted from the pen transmission circuit. The fourth modulating means of the transmitting circuit changes the cycle of the change of the frequency of the electromagnetic wave or light or ultrasonic wave according to the state of the first switch, and the fifth modulating means changes the state of the second switch. In response, the duty ratio of the modulated waveform of the electromagnetic wave or light or ultrasonic wave is changed, and the fourth determination unit of the detection device determines that the period of the change in the frequency of the electromagnetic wave or light or ultrasonic wave received from the pen is greater than a predetermined threshold. The state of the first switch is determined based on whether it is short, whether it is within a predetermined range, or whether it matches the stored cycle, and
The determination means determines whether the duty ratio of the modulated waveform of the electromagnetic wave, light, or ultrasonic wave received from the pen is greater than a predetermined threshold value, is within a predetermined range, or matches a stored value. Based on this, the state of the second switch can be determined.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external configuration of a wireless pen 2 and a tablet 3 which constitute an input device 1. FIG.

FIG. 2 is a block diagram showing a mechanical and electrical configuration inside the wireless pen 2;

FIG. 3 is a wireless pen 2 according to the first embodiment;
FIG. 3 is a circuit diagram of the transmission circuit of FIG.

FIG. 4 is a wireless pen 2 according to a second embodiment;
FIG. 3 is a circuit diagram of the transmission circuit of FIG.

FIG. 5 is a wireless pen 2 according to a third embodiment;
FIG.

FIG. 6 is a wireless pen 2 according to the first embodiment;
FIG. 4 is a diagram showing a modulation waveform of an electromagnetic wave emitted by the device.

FIG. 7 is a wireless pen 2 according to the second embodiment;
FIG. 4 is a diagram showing a modulation waveform of an electromagnetic wave emitted by the device.

FIG. 8 is a wireless pen 2 according to a third embodiment;
FIG. 4 is a diagram showing a modulation waveform of an electromagnetic wave emitted by the device.

FIG. 9 is a block diagram showing an electrical configuration of the tablet 3.

FIG. 10 is a diagram illustrating a CP of the control unit of the tablet 3;
It is a flowchart of a main control program executed in U50.

FIG. 11 is data showing an example of coil scan data in the coordinate detection unit 40;

FIG. 12 is a flowchart of a pen state determination subroutine in a case where the transmitting circuit of the first embodiment shown in FIG. 3 is used.

FIG. 13 is a flowchart of a pen state determination subroutine when the transmission circuit of the second embodiment shown in FIG. 4 is used.

FIG. 14 is a flowchart of a pen state determination subroutine when the transmitting circuit of the third embodiment shown in FIG. 5 is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input device 2 Wireless pen 3 Tablet 4 Case 5 Recording paper 6 Microphone 7 Speaker 10 Grasping part 10a Tip 11 Pen tip 11a Tip 12 Pen tip operating cylinder 13 Operation knob 15 First switch 18 Second switch 20 Transmission circuit Substrate 22 Coil 30 Detection circuit unit 31 Frequency modulation transmission circuit unit 32 Detection circuit unit 33 Frequency duty ratio modulation transmission circuit unit 34 Detection circuit unit 35 Frequency duty ratio modulation transmission circuit unit 40 Coordinate detection unit 41 Data demodulation unit 42 Control unit 50 CPU Reference Signs List 51 RAM 52 ROM 53 I / O interface 54 Non-volatile memory 55 Audio circuit

Claims (7)

[Claims] 1. An input device comprising: a pen for transmitting electromagnetic waves, light, or ultrasonic waves; and a detecting device for detecting the position of the pen with electromagnetic waves, light, or ultrasonic waves, wherein the pen has at least two switches. And different types of modulation means corresponding to the respective switches, and the detection device includes different types of detection means for detecting the state of each switch based on electromagnetic waves or light or ultrasonic waves from the modulation means. An input device, characterized in that: 2. One of said at least two switches.
One is a first switch that detects whether the pen tip of the pen contacts the detecting device, and the other is a second switch that has a different function from the first switch. The input device according to claim 1, wherein: 3. The input device according to claim 2, wherein the second switch is a mode switch for switching a mode of the function of the pen. 4. The pen includes an electromagnetic wave, light, or ultrasonic wave transmitting circuit, and the transmitting circuit is configured to transmit a signal according to a state of the first switch.
It has a first modulation means for changing the frequency of electromagnetic waves or light or ultrasonic waves, the detection device, whether the frequency received from the pen is higher than a predetermined threshold or within a predetermined frequency range or The input according to any one of claims 1 to 3, further comprising a first determination unit configured to determine a state of the first switch based on whether or not the frequency matches the stored frequency. apparatus. 5. The pen includes an electromagnetic wave, light, or ultrasonic wave transmitting circuit, and the transmitting circuit is configured to transmit a signal according to a state of the second switch.
A second modulation unit that changes a cycle of a change in the frequency of the electromagnetic wave or the light or the ultrasonic wave, wherein the detecting device has a predetermined threshold value for a change cycle of the frequency of the electromagnetic wave or the light or the ultrasonic wave received from the pen. A second determination unit configured to determine a state of the second switch based on whether the period is shorter, whether the period is within a predetermined range, or whether the period matches the stored period. The input device according to any one of claims 1 to 4, wherein 6. The pen includes an electromagnetic wave, light, or ultrasonic wave transmitting circuit, and the transmitting circuit is configured to transmit a signal according to a state of the second switch.
A third modulation unit that changes a duty ratio of a modulation waveform of an electromagnetic wave, light, or an ultrasonic wave, wherein the detection device has a duty ratio of a modulation waveform of the electromagnetic wave, light, or an ultrasonic wave received from the pen that is a predetermined threshold. A third determination unit configured to determine a state of the second switch based on whether the value is greater than a predetermined value, whether the value is within a predetermined range, or whether the value matches a stored value. The input device according to any one of claims 1 to 4, wherein 7. The pen includes an electromagnetic wave, light, or ultrasonic wave transmitting circuit, and the transmitting circuit changes a cycle of a frequency change of the electromagnetic wave, light, or ultrasonic wave according to a state of the first switch. A fourth modulation unit for changing the duty ratio of a modulation waveform of an electromagnetic wave, light, or an ultrasonic wave in accordance with a state of the second switch. Based on whether the period of the change of the frequency of the electromagnetic wave or light or ultrasonic wave received from the first time is shorter than a predetermined threshold value, is within a predetermined range, or matches the stored period. A fourth determination means for determining the state of the switch, whether the duty ratio of the modulated waveform of the electromagnetic wave or light or ultrasonic wave received from the pen is larger than a predetermined threshold value, whether the duty ratio is within a predetermined range, or stored. Is Determining the state of the second switch based on whether the second switch value matches the fifth value.
The input device according to any one of claims 1 to 3, further comprising: a determination unit.