JPH0778050A - Coordinate input device for pen input - Google Patents

Abstract

PURPOSE:To surely receive the signal from a pen through simple constitution by radiating an ultrasonic wave from the upper end of the pen downward equally to the whole circumference and detecting the ultrasonic wave by a receiving sensor which is provided at the peripheral part of the coordinate input device. CONSTITUTION:The cordless pen 11 detects and inputs the coordinates of a touched position on the coordinate input device 21 and inputs various instructions with its click button 12 depressed. An ultrasonic wave transmitter 13 sends the ultrasonic wave from the upper end of the pen 11 in response to the depression of the click button 12 and a reflecting plate 14 reflects the ultrasonic wave downward to the whole outer periphery of the pen 11. The receiving sensor 22 arranged at the outer peripheral part of the coordinate input device 21 detects the ultrasonic wave radiated from the upper end of the pen 11. Thus, the ultrasonic wave is radiated downward from the upper end of the pen 11 equally to the whole periphery and detected by the receiving sensor 22 provided at the outer peripheral part of the coordinate input device 21, so that the receiving sensor 22 can detect the ultrasonic wave without being disturbed by an obstacle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen input coordinate input device for pen input from a coordinate input device.

In the field of personal computers, etc.
In recent years, as a new man-machine interface, a pen input computer that performs various inputs by handwritten characters and handwritten figures with a pen has been attracting attention.

At present, as a coordinate input device for this pen input computer, two systems of an electromagnetic induction type and a resistance film type have been put into practical use and are commercially available. However, in the case of the resistive film method, the click button function cannot be realized when the pen is to be made cordless due to its detection principle. Therefore, when the click button function is attached, it is necessary to connect the pen and the coordinate input device main body with a cord, and the spread thereof is delayed as compared with the electromagnetic induction type. For this reason, it is strongly desired to realize a click button function by some method without using a pen as a cordless pen input coordinate device using a resistive film method.

[0004]

2. Description of the Related Art In the electromagnetic induction method, coordinates are detected by transmitting and receiving electromagnetic waves between a pen and a panel. Therefore, in addition to normal coordinate detection, the frequency of transmission and reception is changed to turn on / off a click button. The signal can be transmitted and the pen can be easily made cordless. Therefore, it is now widely used for pen input personal computers. The pen used transmits and receives electromagnetic waves, consumes a large amount of power, and it is necessary to consider the influence of the transmitted electromagnetic waves on other devices.

On the other hand, the resistance film method is advantageous over the electromagnetic induction method in that it is thin, lightweight, and has low power consumption, and that it is not necessary to use a special pen. In order to add the click button function, the connection line was connected to the pen to transmit the on / off signal of the click button to realize the click button function.

[0006]

As described above, the conventional resistance film type pen has many advantages, but in order to realize the click button function, the click button ON / OFF signal is connected to the connection line. It is difficult to make it cordless because it has to be transmitted.

In order to solve this, a method using electromagnetic waves, light, ultrasonic waves, etc. has been proposed. For example, when ultrasonic waves are used, the ultrasonic waves normally have directivity, and when ultrasonic waves are transmitted in response to the on / off state of the click button and are received by a receiving sensor placed in the vicinity, obstacles between the two will occur. Usually, since the operator holds the pen with his / her hand, there is a problem in that the hand may get in the way and the signal cannot be transmitted. More specifically, as shown in FIG. 9, the click button 5 is moved from the ultrasonic transmitter 52 of the pen 51.
Corresponding to the pressing of 3, ultrasonic waves are transmitted, and the coordinate input device 54
When receiving with the receiving sensor 55 placed at the end of the
It is necessary to press the click button 53 of the pen 51 with the surface of the ultrasonic wave transmitter 52 of the first ultrasonic wave transmitted toward the receiving sensor 55. In order to avoid this, a plurality of ultrasonic wave transmitters 52 may be provided around the pen 51, but there is a problem that the cost increases, and when the ultrasonic wave oscillator 52 is attached around the lower part of the pen, the pen 51 is
There is a problem in that the hand holding the hand interferes with the reception of the ultrasonic wave to the reception sensor 55, which makes it very difficult to use.

The present invention solves these problems by
Ultrasonic waves are radiated downward from the upper end of the pen evenly around the entire circumference, and the ultrasonic waves are detected by the receiving sensor provided on the outer circumference of the coordinate input device without being obstructed by obstacles, ensuring a simple structure. The purpose is to realize a cordless pen that receives signals from the pen

[0009]

FIG. 1 is a block diagram showing the principle of the present invention. In FIG. 1, the pen 11 is for inputting coordinates on the coordinate input device 21 and for pressing the click button 12 to input various instructions. The click button 12, the ultrasonic oscillator 13, and the reflector 14 are used. It is composed of etc.

The click button 12 is used to input various instructions. The ultrasonic wave transmitter 13 transmits an ultrasonic wave. The reflector 14 evenly reflects the ultrasonic waves to the outer circumference of the pen 11.

The coordinate input device 21 is a device for bringing the tip of the pen 11 into contact and reading the coordinates of the position to input. The reception sensor 22 detects ultrasonic waves emitted from the upper end of the pen 11.

[0012]

According to the present invention, as shown in FIG. 1 and the like, the pen 11 is provided with the click button 12, and the pen 11 is used as the coordinate input device 2.
The ultrasonic wave transmitter 13 transmits ultrasonic waves from the upper end of the pen 11 toward the outer peripheral downward direction in response to the depression of the click button 12 while touching 1 to input the coordinate, and the coordinate input device 21 The reception sensor 22 provided on the outer periphery receives the ultrasonic wave and detects ON / OFF.

Further, the pen 11 is provided with a click button 12, the pen 11 is brought into contact with the coordinate input device 21 to input coordinates, and in response to depression of the click button 12,
The ultrasonic transmitter 13 transmits ultrasonic waves toward the upper end of the pen 11 and reflects the ultrasonic waves downward on the outer periphery of the pen 11 by the reflector 14 to form a reception sensor provided on the outer periphery of the coordinate input device 21. 22 receives this ultrasonic wave and detects ON / OFF.

At this time, the reflection plate 14 has a conical shape so that ultrasonic waves are evenly reflected downward in the entire outer circumference of the pen 11. Further, the pen 11 is provided with a plurality of click buttons 12.

Further, the ultrasonic transmitter 13 is adapted to emit ultrasonic waves of different frequencies in response to pressing of the click button 12. In addition, the ultrasonic wave transmitter 13 transmits ultrasonic waves with different pulse intervals in response to pressing of the click button 12.

Further, the ultrasonic transmitter 13 is adapted to transmit ultrasonic waves in which carrier waves are amplitude-modulated with different frequency signals in response to pressing of the click button 12. Further, the click button 12 is turned on when the pen 11 is pressed on the coordinate input device 21.

Therefore, the ultrasonic wave is uniformly radiated downward from the upper end of the pen 11 to the entire circumference, and the ultrasonic wave is not disturbed by an obstacle by the reception sensor 22 provided on the outer peripheral portion of the coordinate input device 21. It is possible to realize a cordless pen that detects and surely receives a signal from the pen with a simple structure.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the configuration of FIG. 1 will be described. In FIG. 1, a pen 11 is a cordless pen for detecting and inputting coordinates of a position touched on the coordinate input device 21 or for pressing a click button 12 to input various instructions. is there. This pen 11 has a click button 1
2. The ultrasonic wave transmitter 13 and the reflector 14 are included.

The click button 12 is used to input various instructions and corresponds to the click button of a mouse. The ultrasonic transmitter 13 transmits ultrasonic waves, and transmits ultrasonic waves in response to pressing of the click button 12.

The reflection plate 14 reflects the ultrasonic waves transmitted from the ultrasonic oscillator 13 downward in the entire outer circumference of the pen 11, and has a conical shape. The coordinate input device 21 is a device such as a resistive film type coordinate input device that contacts the tip of the pen 11 and detects the coordinates of the position to input coordinates.

The reception sensor 22 detects ultrasonic waves emitted from the upper end of the pen 11, and is arranged on the outer peripheral portion of the coordinate input device 21. FIG. 2 shows an example of the structure of the pen of the present invention. This shows an example of the detailed structure of the pen 11 of FIG.

In FIG. 2, the pen 11 is a pen having a pointed cylindrical end as shown in the figure, and the pointed end is brought into contact with the coordinate input device 21 to input coordinates. The button 12, the ultrasonic transmitter 13, the reflector 14, the transmitting circuit 15, the battery 16, the window 17, and the like. Here, the reflection plate 14 is provided on the upper end opposite to the pointed tip of the pen 11 so that ultrasonic waves are evenly emitted downward to the outer peripheral portion of the pen 11.

The click button 12 operates the transmitting circuit 15 to cause the ultrasonic transmitter 13 to emit an ultrasonic wave in response to being pressed. Ultrasonic transmitter 13
Corresponding to the input of the transmission signal from the transmission circuit 15, the ultrasonic wave is emitted, reflected by the conical reflection plate 14 and evenly emitted from the window 17 in the downward direction of the entire outer periphery of the pen 11. It is a thing.

The reflecting plate 14 reflects the ultrasonic waves transmitted from the ultrasonic transmitter 13 and radiates the ultrasonic waves downward in the entire outer circumference of the pen 11, and has a conical shape here. is there.

The transmission circuit 15 transmits a high frequency signal for generating ultrasonic waves in response to the power supply from the battery 16. The battery 16 is a battery that supplies power to the transmission circuit 15.

The window 17 is a window through which the ultrasonic waves reflected by the reflection plate 14 are emitted to the entire outer peripheral portion of the pen 11. By configuring the pen 11 as described above, in response to pressing of the click button 12, the transmitting circuit 15 transmits a high frequency signal based on the power supplied from the battery 16 and receives the high frequency signal. The ultrasonic transmitter 13 emits an ultrasonic wave, which is reflected by the reflection plate 14 and is radiated from the window 17 evenly downward in the entire outer peripheral portion of the pen 11. As a result, as shown in FIG. 1, an ultrasonic signal emitted from the pen 11 is detected by the reception sensor 22 arranged on the outer peripheral portion of the coordinate input device 21, and it is detected that the click button 12 has been pressed. It becomes possible to do. At this time, ultrasonic waves are radiated downward from the upper end of the pen 11 evenly in the entire outer peripheral direction of the pen 11, so that ultrasonic waves that are not disturbed by the direction in which the operator holds the pen 11 or the position of the hand input coordinates. It is surely received by any of the reception sensors 22 provided on the outer peripheral portion of the device 21. The details will be sequentially described below.

FIG. 3 shows the overall configuration of the present invention. Here, pen 11, click button 12, ultrasonic transmitter 1
3, the reflector 14, the transmission circuit 15, the battery 16, and the coordinate input device 21 are the same as those in FIGS.

In FIG. 3, the reception sensor 22 is provided on the outer peripheral portion of the coordinate input device 21 as shown in the drawing, and is reflected by the reflection plate 14 at the upper end of the pen 11 to be reflected on the outer peripheral portion of the pen 11. This is to receive the input one of the dotted arrows shown in the figure of the ultrasonic waves radiated uniformly in the downward direction. The ultrasonic signal received by the reception sensor 22 is input to the amplifier 31 of the reception circuit 30.

The receiving circuit 30 amplifies the ultrasonic signal received by the receiving sensor 22, and clicks on the click button 12.
This is for determining whether or not the button has been pressed, and as shown in the figure, is composed of an amplifier 31, a full-wave rectification circuit 32, an envelope detection circuit 33, a comparator 34, and the like.

The amplifier 31 amplifies the weak ultrasonic signal received by the reception sensor 22. The full-wave rectifier circuit 32 is for full-wave rectifying the signal amplified by the amplifier 31.

The envelope circuit 33 is a circuit for extracting the envelope of the signal that is full-wave rectified by the full-wave rectifier circuit 32. The comparator 34 determines whether the envelope signal extracted by the envelope circuit 33 is larger than a predetermined threshold and the click button 12 is pressed, or is smaller than a predetermined threshold and the click button 12 is released. It is a comparator with hysteresis. The signal determined by the comparator 34 is output as TTL level on / off (1/0) and input to a computer system (not shown).

As described above, in response to pressing the click button 12 provided on the pen 11, any one of the ultrasonic waves emitted downward from the pen 11 evenly over the entire outer circumference is received by the reception sensor 22, and The received signal is amplified by the amplifier 31, full-wave rectified by the full-wave rectifier circuit 32, the envelope is extracted by the envelope circuit 33, and the value of the envelope extracted by the comparator 34 is larger than a predetermined threshold value. Turns on when it is on, turns off when it is low, and sets the TTL level to 1
Output as / 0. As a result, the click button 12 provided on the pen 11 can be pressed down, and the on / off state can be surely output as the TTL level signal I / 0 without being disturbed by the hand.

FIG. 4 shows an example of mounting the receiving sensor of the present invention. In FIG. 4, a plurality of reception sensors 22 are arranged on the outer peripheral portion of the glass panel 211 of the coordinate input device 21, as shown in the figure, and are arranged at the four corners and in front of the operator.

The glass panel 211 is a coordinate input section provided with a resistance film, and is a panel for reading and inputting the coordinates of the position when the sharp tip of the pen 11 is contacted.

As described above, by disposing a plurality of reception sensors 22 on the outer peripheral portion of the glass panel 211 of the coordinate input device 21, the pen 11 can be placed on the glass panel 211.
While pressing the pointed end of the pen to input coordinates, or with the pen 11 slightly lifted, press the click button 12 of the pen 11 to evenly distribute ultrasonic waves downward in the entire outer circumference of the pen 11. Any of the emitted ultrasonic waves is received by any of the plurality of reception sensors 22. As a result, even if the operator holds the pen 11 on the glass panel 211 and presses the click button 12 while inputting coordinates, the on / off state of the click button 12 can be reliably detected without a cord. Becomes

FIG. 5 is an explanatory diagram of discrimination according to the difference of the transmission frequency of the present invention. This is a click button (1),
In response to pressing of (2), ultrasonic waves of different frequencies are transmitted, and the click buttons (1) and (2) are received by the receiving circuit 30.
It is for determining whether to turn on or off.

In FIG. 5, the click button (1),
(2) is the two click buttons 12 provided on the pen 11.
And corresponds to the mouse button (1) and button (2).

The transmitting circuits (1) and (2) are the transmitting circuit 15 which transmits ultrasonic signals having different frequencies f1 and f2. The ultrasonic transmitter 13 inputs the ultrasonic signals of different frequencies f1 and f2 from the transmitter circuits (1) and (2) and transmits the ultrasonic waves of the frequencies f1 and f2.

The reception sensor 22 receives the ultrasonic waves emitted from the ultrasonic transmitter 13 of the pen 11 and converts them into ultrasonic signals. The amplifier 31 amplifies a weak ultrasonic signal received by the reception sensor 22.

The FV converter 35 converts the frequency of the ultrasonic signal amplified by the amplifier 31 into a voltage and determines which of the frequencies f1 and f2 is the signal. Here, it is determined that the click button (1) has been pressed at the voltage corresponding to the frequency f1, and that the click button (2) has been pressed at the voltage corresponding to the frequency f2.

The full-wave rectifier circuit 32 is for full-wave rectifying the signal amplified by the amplifier 31. The envelope detection circuit 33 extracts the envelope of signals (signals of frequencies f1 and f2) that are full-wave rectified by the full-wave rectification circuit 32.

The comparator 34 includes an envelope detection circuit 33.
Regarding the value of the envelope extracted by, when the click buttons (1) and (2) are determined to be on when the value is equal to or more than a predetermined threshold value,
When the threshold value is equal to or less than the predetermined threshold value, the click buttons (1) and (2) are determined to be off. At this time, a comparator 34 having a hysteresis is used to prevent instability of ON / OFF due to a value near a predetermined threshold value.

As described above, when the click button (1) provided on the pen 11 is pressed, the ultrasonic wave of the frequency f1 is emitted, and when the click button (2) is pressed, the frequency f is emitted.
2 ultrasonic waves are emitted, and these frequencies f1 and f are received at the receiving side.
The receiving sensor 22 receives any one of the signals No. 2 and 2, and determines which of the click buttons (1) and (2) has been pressed and the pressed signal ON / OFF. With these, two click buttons (1) provided on the pen 11,
It is possible to surely detect the pressing of (2) by cordlessly.

FIG. 6 is an explanatory view of the discrimination according to the difference of the transmission pulse interval of the present invention. This is because ultrasonic waves with different transmission pulse intervals are transmitted in response to pressing of the click buttons (1) and (2), and the receiving circuit 30 determines whether the click buttons (1) and (2) are on or off. It is a thing.

In FIG. 6, the click button (1),
(2) is the two click buttons 12 provided on the pen 11.
Is. The transmitting circuits (1) and (2) are the transmitting circuit 15 that transmits ultrasonic signals having different transmitting pulse intervals t1 and t2.

The ultrasonic transmitter 13 includes an oscillator circuit (1),
The ultrasonic signals having different transmission pulse intervals t1 and t2 from (2) are input and the different ultrasonic waves having the transmission pulse intervals t1 and t2 are transmitted.

The reception sensor 22 receives an ultrasonic wave emitted from the ultrasonic wave transmitter 13 of the pen 11 and converts it into an ultrasonic wave signal. The amplifier 31 amplifies a weak ultrasonic signal received by the reception sensor 22.

The pulse interval counter 37 counts the pulse intervals of the ultrasonic signals amplified by the amplifier 31 and having different transmission pulse intervals t1 and t2, and determines one of them. Here, it is determined that the click button (1) has been pressed at the transmission pulse interval t1, and that the click button (2) has been pressed at the transmission pulse interval t2.

The comparator 36 determines that the click buttons (1) and (2) are ON when the value of the ultrasonic signal amplified by the amplifier 31 is equal to or higher than a predetermined threshold value, and the click button (1) is equal to or lower than the predetermined threshold value. , (2) are determined to be off. At this time, the comparator 36 having a hysteresis is used to prevent the on / off instability due to a value near the predetermined threshold from occurring.

As described above, when the click button (1) provided on the pen 11 is pressed, ultrasonic waves having a pulse interval t1 are emitted, and when the click button (2) is pressed, ultrasonic waves having a pulse interval t2 are emitted. , The receiving side receives a signal of any one of these pulse intervals t1 and t2 by the receiving sensor 22, determines which click button (1) or (2) is pressed, and whether the pressed signal is on / off. To do.
As a result, it is possible to reliably detect the pressing of the two click buttons (1) and (2) provided on the pen 11 without using a cord.

FIG. 7 is an explanatory diagram of discrimination according to the difference in amplitude modulation frequency of the present invention. This is because ultrasonic waves having different amplitude modulation frequencies are transmitted in response to pressing of the click buttons (1) and (2), and the receiving circuit 30 determines whether the click buttons (1) and (2) are on or off. It is a thing. This will be described in detail below with reference to FIG.

In FIG. 7, the click button (1),
(2) is the two click buttons 12 provided on the pen 11.
Is. The transmission circuit 151 transmits the signal of the carrier wave f0.

The transmitting circuits (1) 152 and (2) 154 are
The signal of frequency f1 and frequency f2 is transmitted.
The amplitude modulation circuits (1) 153 and (2) 155 are ultrasonic signals (f0 +) modulated with different amplitude modulation frequencies f1 and f2.
f1) and (f0 + f2) are transmitted.

The ultrasonic transmitter 13 is an amplitude modulation circuit (1).
153, (2) Different ultrasonic signals (f0 +
By inputting f1) and (f0 + f2), ultrasonic waves are transmitted ((d) and (e) in FIG. 8).

The reception sensor 22 receives the ultrasonic waves emitted from the ultrasonic transmitter 13 of the pen 11 and converts them into ultrasonic signals ((f) in FIG. 8). The amplifier 31 amplifies a weak ultrasonic signal received by the reception sensor 22.

The demodulation circuit 38 demodulates the signals (f0 + f1) and (f0 + f2) amplified by the amplifier 31,
The signal of the frequency f1 or the frequency f2 is taken out ((g) of FIG. 8).

The F-V converter 39 converts the signal of the frequency extracted by the demodulation circuit 38 into a voltage, and the frequency f
It is to determine whether the signal is 1 or f2. Here, it is determined that the click button (1) is pressed at the voltage corresponding to the frequency f1, and it is determined that the click button (2) is pressed at the voltage corresponding to the frequency f2 ((h in FIG. 8). )).

The envelope detection circuit 40 extracts the envelopes of the signals (f0 + f1) and (f0 + f2) amplified by the amplifier 31. The comparator 41 clicks the click button (1) when the envelope value extracted by the envelope detection circuit 40 is equal to or more than a predetermined threshold value.
It is determined that (2) is on, and if the click buttons (1) and (2) are equal to or less than the predetermined threshold value, they are determined to be off. At this time, the comparator 41 having hysteresis is used to prevent the on / off instability due to the value near the predetermined threshold from occurring.

As described above, when the click button (1) provided on the pen 11 is pressed, the ultrasonic wave of the ultrasonic signal (f0 + f1) modulated by the amplitude modulation frequency f1 is emitted, and the click button (2) is pressed. Amplitude modulation frequency f
The ultrasonic wave of the ultrasonic wave signal (f0 + f2) modulated by 2 is radiated, the receiving side receives any one of these amplitude modulation frequencies f1 and f2 at the receiving side, and any click button (1), ( 2) Determining whether or not the pressed signal is turned on / off. With these, pen 1
It is possible to reliably detect the pressing of the two click buttons (1) and (2) provided in 1 by cordlessly.

FIG. 8 shows a waveform diagram according to the difference in the amplitude modulation frequency of the present invention. This shows a waveform diagram with the configuration of FIG. FIG. 8A shows a waveform diagram of the signal of the frequency f1 transmitted by the transmission circuit (1) when the click button (1) is pressed.

FIG. 8B shows a waveform diagram of the signal of the frequency f2 transmitted by the transmission circuit (2) when the click button (2) is pressed. FIG. 8C shows the transmission circuit 1 when the click button (1) or (2) is pressed.
The waveform diagram of the signal of the frequency f0 of the carrier wave which 51 transmits is shown.

FIG. 8D shows the frequency (f0) transmitted by the amplitude modulation circuit (1) 153 with (a) and (c) as inputs.
The waveform diagram of the signal of + f1) is shown. FIG. 8 (e) shows
Amplitude modulation circuit (2) 155 with (b) and (c) as inputs
The wave form diagram of the signal of the frequency (f0 + f2) transmitted by is shown.

FIG. 8F shows a waveform diagram of the signal received by the reception sensor 22. This is a waveform diagram of the signal of either (d) or (e) of FIG. (G) of FIG.
Shows a waveform diagram of the signal after demodulation by the demodulation circuit 38.

FIG. 8H shows a state in which the FV converter 39 performs frequency-voltage conversion to determine which of the click buttons (1) and (2) corresponds to the voltage signal. (I) of FIG. 8 shows a waveform diagram of a signal whose envelope is extracted by the envelope detection circuit 40.

In (j) of FIG. 8, the click buttons (1) and (2) are determined to be on when the value of the envelope signal of (i) is a predetermined value or more and off when the value is a predetermined value or less. The waveform is shown.

[0066]

As described above, according to the present invention,
Since the ultrasonic wave is evenly emitted downward from the upper end of the pen 11 and is detected by the reception sensor 22 provided on the outer peripheral portion of the coordinate input device 21, the ultrasonic wave is emitted from the upper end of the pen 11. It is possible to eliminate the situation where ultrasonic waves are detected by any of the reception sensors 22 and disturbed by obstacles and ultrasonic signals cannot be detected, and a cordless pen that surely receives signals from the pen with a simple structure is used. Can be realized. This makes it possible to realize a click button function using a cordless pen, which is difficult to realize in the past, particularly in a coordinate input device for a pen input personal computer of a resistive film type.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a structural example of a pen of the present invention.

FIG. 3 is an overall configuration diagram of the present invention.

FIG. 4 is an example of mounting a reception sensor of the present invention.

FIG. 5 is an explanatory diagram of discrimination according to a difference in transmission frequency of the present invention.

FIG. 6 is an explanatory diagram of discrimination according to a difference in transmission pulse interval according to the present invention.

FIG. 7 is an explanatory diagram of discrimination according to a difference in amplitude modulation frequency of the present invention.

FIG. 8 is a waveform diagram according to a difference in amplitude modulation frequency of the present invention.

FIG. 9 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 11: Pen 12: Click Button 13: Ultrasonic Transmitter 14: Reflector 15, 151, 152, 154: Transmission Circuit 153, 155: Amplitude Modulation Circuit 16: Battery 17: Window 21: Coordinate Input Device 211: Glass Panel 22 : Reception sensor 30: Reception circuit 31: Amplifier 32: Full wave rectification circuit 33, 40: Envelope detection circuit 34, 41: Comparator 35, 39: FV converter 36: Comparator 37: Pulse interval counter 38: Demodulation circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoya Ogawa 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Fumihiko Nakazawa, 1015 Kamedotachu, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (8)

[Claims] 1. An ultrasonic transmitter (13) for transmitting ultrasonic waves downward from the upper end of the pen (11), a click button (12) provided on the pen (11), and a pen (11). The coordinate input device for pen input, comprising: a reception sensor (22) provided on the outer peripheral portion of the coordinate input device (21) for detecting ultrasonic waves radiated from the upper end of FIG. 2. An ultrasonic transmitter (13) for transmitting ultrasonic waves to the upper end of the pen (11), a click button (12) provided on the pen (11), and the ultrasonic transmitter (13). ), A reflection plate (14) for reflecting the ultrasonic wave transmitted toward the upper end in the pen (11) downward in the outer periphery of the pen (11), and emitted by this reflection plate (14). A coordinate input device for pen input, comprising: a reception sensor (22) provided on the outer periphery of the coordinate input device (21) for detecting ultrasonic waves. 3. A coordinate input for pen input, characterized in that the reflector (14) according to claim 2 has a conical shape and is configured to uniformly reflect ultrasonic waves downward in the outer periphery of the pen (11). apparatus. 4. The coordinate input device for pen input according to claim 1, wherein a plurality of click buttons (12) are provided. 5. The ultrasonic transmitter (13) is configured to emit ultrasonic waves of different frequencies in response to pressing of the plurality of click buttons (12). The coordinate input device for pen input according to claim 4. 6. The ultrasonic transmitter (13) is configured to emit ultrasonic waves having different pulse intervals in response to pressing of the plurality of click buttons (12). The coordinate input device for pen input according to claim 4. 7. The ultrasonic transmitter (13) is configured to transmit ultrasonic waves in which carrier waves are amplitude-modulated with different frequency signals in response to pressing of the plurality of click buttons (12). The coordinate input device for pen input according to any one of claims 1 to 4. 8. The coordinate input device (21) for the pen (11).
4. A structure in which the click button (12) is turned on when the button is pressed down.
The coordinate input device for pen input described.