JPH0667793A - Coordinate input device - Google Patents

Abstract

PURPOSE:To decrease power consumption in a coordinate input device. CONSTITUTION:In the coordinate input device which detects coordinates based on the output of detection circuits 7-3 to 7-6 to detect the delay time of oscillation detected by sensors 6a-6d, a transistor 7-2 is turned off by a control signal (b) when no oscillation is detected for a prescribed period of time, and the supply of the power source of the detection circuits 7-4 to 7-6 are stopped. When the oscillation is detected by the detection circuit 7-3 during that time, the supply of the power to the detection circuits 7-4 to 7-6 are started again by turning on the transistor 7-2 by the control signal (b). A circuit to check only the presence/absence of the oscillation is provided separately from the detection circuit without letting the whole detection circuits e an object, and the power supply other than the circuit can be stopped when no oscillation is inputted for a prescribed period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate input device, and more particularly, to a coordinate input device in a device requiring portability.

[0002]

2. Description of the Related Art Conventionally, a coordinate input device and a display device are integrated, and handwriting is input on the coordinate input device with an input pen.
A device has been proposed which displays on the screen according to the input coordinates and improves the operability of the computer.

[0003] In such a device, there are many usage forms such as outdoor use with added portability, and since a dry battery or a storage battery is used as a power source, it is necessary to suppress power consumption as much as possible in order to extend the use time of the device. It was Therefore, means such as turning off the power source of the main body when there has been no input (unoperated) time for a certain period of time has been ruined.

[0004]

However, when the non-input determination time setting is shortened in order to reduce the power consumption, the main body power switch is frequently turned on and off,
There was a problem that the operability was lowered. Further, there is also a method in which only the input device is turned on and the main body power supply is controlled by input determination, but there is a problem that it is difficult to reduce power consumption because the entire input device operates.

The present invention has been made in view of the above conventional example, and an object of the present invention is to provide a coordinate input device having good operability and low power consumption.

[0006]

[Means for Solving the Problems] and

To achieve the above object, the coordinate input device of the present invention has the following structure. A coordinate input device for detecting a vibration input to a vibration transmission plate and obtaining a coordinate position on the vibration transmission plate based on a delay time of the vibration, the plurality of which are provided on the vibration transmission plate and driven by electric power. A vibration detecting means, a measuring means for measuring an elapsed time after the vibration is detected by the vibration detecting means, and a judging means for judging that the time measured by the measuring means exceeds a predetermined value, Based on the determination made by the determination means, a mode transition means that cuts off the power supply power of a predetermined vibration detection means of the plurality of vibration detection means to a sleep mode, and a vibration detection in which the power supply power is not cut off in the sleep mode. And means for returning from the sleep mode by supplying power to the predetermined vibration detecting means based on the vibration detection result by the means.

To achieve the above object, the coordinate input device of the present invention has the following structure.

The vibration input to the vibration transmission plate is detected by a plurality of vibration detection means provided on the vibration transmission plate, and the coordinate position at which the vibration is input is measured based on the delay time from the vibration input to the detection. In the coordinate input device, a vibration input means that vibrates intermittently, a plurality of vibration detection means driven by electric power, which are provided on the vibration transmission plate, and a time during which no vibration is detected by the vibration detection means The measuring means for measuring and the means for controlling the time interval in which the vibration input means vibrates based on the time measured by the measuring means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of a coordinate input device in this embodiment. Reference numeral 1 in the figure denotes an arithmetic control circuit for controlling the entire apparatus and calculating a coordinate position. Reference numeral 2 denotes a vibrator drive circuit for vibrating the pen tip inside the vibrating pen 3. Reference numeral 8 is a vibration transmission plate made of a transparent member such as acrylic or glass plate. Coordinates are input by the vibration pen 3 by touching the vibration transmission plate 8. Actually, the area indicated by the symbol A shown by a solid line in the figure (hereinafter referred to as an effective area)
The inside is specified with the vibration pen 3. A vibration damping material 7 is provided on the outer periphery of the vibration transmitting plate 8 for preventing (reducing) the reflected vibration from returning to the central portion. The vibration sensors 6a to 6d for converting to are fixed.

Reference numeral 9 is a signal waveform detection circuit for outputting to the arithmetic and control circuit 1 a signal indicating that vibration has been detected by each of the vibration sensors 6a to 6d. Reference numeral 11 is a display such as a liquid crystal display capable of displaying in dot units, and is arranged behind the vibration transmission plate. Then, by driving the display drive circuit 10, it is possible to display a dot at a position traced by the vibrating pen 3 and see it through the vibration transmission plate 8 (made of a transparent member).

The vibrator 4 built in the vibrating pen 3 is driven by the vibrator driving circuit 2. The drive signal for the vibrator 4 is supplied as a low-level pulse signal from the arithmetic control circuit 1, amplified by the vibrator drive circuit 2 with a predetermined gain, and then applied to the vibrator 4.

The electric drive signal is converted into mechanical ultrasonic vibration by the vibrator 4, and is transmitted to the vibration transmission plate 8 via the pen tip 5.

Here, the vibration frequency of the vibrator 4 is selected to a value capable of generating a plate wave on the vibration transmission plate 8 such as glass. Further, when driving the vibrator, a mode in which the vibration transmitting plate 8 vibrates in the vertical direction of FIG. 2 is selected. Further, by setting the vibration frequency of the vibrator 4 to the resonance frequency including the pen tip 5, it is possible to perform efficient vibration conversion.

The elastic wave transmitted to the vibration transmission plate 8 as described above is a plate wave, and has an advantage that it is less susceptible to scratches and obstacles on the surface of the vibration transmission plate as compared with surface waves. .

<Description of Arithmetic and Control Circuit> In the above-mentioned configuration, the arithmetic and control circuit 1 has a predetermined cycle (for example, every 5 ms).
Then, a signal for driving the vibrator driving circuit 2 and the vibrator 4 in the vibrating pen 3 is output, and the internal timer (made up of a counter) starts timing. And
The vibration generated by the vibrating pen 3 propagates on the vibration transmission plate 2 and arrives with a delay according to the distance to the vibration sensors 6a to 6d.

The vibration waveform detection circuit 9 includes vibration sensors 6a-
The signal from 6d is detected, and a signal indicating the vibration arrival timing to each vibration sensor is generated by the waveform detection processing described later. The arithmetic control circuit 11 inputs this signal for each detection sensor, and the respective vibrations are detected. The vibration arrival time to the sensors 63a to 6d is detected, and the coordinate position of the vibration pen is calculated.

The arithmetic control circuit 1 drives the display drive circuit 10 based on the calculated position information of the vibrating pen 3 to control the display on the display 11 (not shown), or by serial or parallel communication. Output coordinates to external device. (Not shown) FIG. 34 is a block diagram showing a schematic configuration of the arithmetic control circuit 1 of the embodiment, and each component and its operation outline will be described below.

In the figure, reference numeral 31 is a microcomputer for controlling the arithmetic control circuit 1 and the coordinate input apparatus as a whole, and an internal counter, a ROM storing operation procedures, a RAM used for calculation and the like, a nonvolatile memory storing constants and the like. It is composed of a sex memory.

Reference numeral 33 denotes a timer (not shown) for counting a reference clock, which is constituted by a counter or the like, and is a start for causing the vibrator drive circuit 2 to start driving the vibrator 4 in the vibrator pen 3. When a signal is input, the timing starts. This synchronizes the start of timing and the vibration detection by the sensor, and the detection sensor (6a to 6d)
Thus, the delay time until the vibration is detected can be measured.

In addition, the circuits as the respective constituent elements will be described in order.

The vibration arrival timing signals from the vibration sensors 6a to 6d output from the vibration waveform detection circuit 9 are latched through the detection signal input port 35 to the latch circuits 34a to 34.
It is input to d. Each of the latch circuits 34a to 34d corresponds to each of the vibration sensors 6a to 6c, and when receiving a timing signal from the corresponding sensor, latches the clocked value of the timer 33 at that time. When the determination circuit 36 determines that all the detection signals have been received,
A signal to that effect is output to the microcomputer 31.

When the microcomputer 31 receives the signal from the judging circuit 36, the latch circuits 34a to 34a are provided.
The vibration arrival time from d to each vibration sensor is read from the latch circuit, a predetermined calculation is performed, and the vibration transmission plate 8
The coordinate position of the upper vibrating pen 3 is calculated. And I / O
By outputting the calculated coordinate position information to the display drive circuit via the port 37, for example, a dot or the like can be displayed at a corresponding position on the display. Or via the I / O port 37 to the interface circuit,
The coordinate value can be output to an external device by outputting the coordinate position information.

<Description of Vibration Propagation Time Detection (FIGS. 4 and 5)
> Hereinafter, the principle of measuring the vibration arrival time to the vibration detection sensor 3 will be described.

FIG. 4 is a diagram for explaining a detection waveform input to the signal waveform detection circuit 9 and a vibration transmission time measuring process based on the detection waveform. In the following, the vibration sensor 6a will be described, but the other vibration sensors 6b, 6c,
The same is true for 6d.

It has already been described that the measurement of the vibration transmission time to the vibration sensor 6a is started at the same time when the start signal is output to the vibrator drive circuit 2. At this time, the drive signal 41 is applied from the vibrator drive circuit 2 to the vibrator 14.
The ultrasonic vibration transmitted from the vibration input pen 3 to the vibration transmission plate 8 by the signal 41 progresses for a time tg corresponding to the distance to the vibration sensor 6a, and then the vibration sensor 6a.
detected in a. The signal indicated by 42 in the figure shows the signal waveform detected by the sensor 6a.

Since the vibration used in this embodiment is a plate wave, the relationship between the envelope 421 and the phase 422 of the detected waveform with respect to the propagation distance in the vibration transmission plate 8 is the same as the transmission distance during vibration transmission. It changes accordingly. Here, the traveling speed of the envelope 421, that is, the group speed is Vg, and the phase speed of the phase 422 is Vp. The distance between the vibration pen 3 and the vibration sensor 6a can be detected from the group velocity Vg and the phase velocity Vp.

First, focusing only on the envelope 421, its speed is Vg, and when a point on a certain specific waveform, for example, an inflection point or a peak like a signal shown in FIG. 43 is detected, the vibration pen 3 and the vibration are detected. The distance between the sensors 6a is
Given that the vibration transmission time is tg, it is given by d = Vg · tg (1). This equation relates to one of the vibration sensors 6a, but the other two vibration sensors 6b are represented by the same equation.
The distance between 3d and the vibrating pen 3 can be similarly expressed.

Further, in order to determine the coordinates with higher accuracy, processing based on the detection of the phase signal is performed. The time from the specific detection point of the phase waveform signal 422, for example, the application of vibration to the zero cross point after a certain predetermined signal level 46 is tp.
45 (obtained by generating the window signal 44 having a predetermined width with respect to the signal 47 and comparing it with the phase signal 422), the distance between the vibration sensor and the vibration pen is d = n · λp + Vp · tp (2) Become. Here, λp is the wavelength of the elastic wave, and n is an integer.

From the above equations (1) and (2), the above integer n
Is expressed as n = [(Vg · tg−Vp · tp) / λp + 1 / N] (3).

Here, N is a real number other than "0", and an appropriate value is used. For example, if N = 2, then n can be determined if there is a variation such as tg within ± 1/2 wavelength. The distance between the vibration pen 3 and the vibration sensor 6a can be accurately measured by substituting the determined n into the equation (2). The signals 43 and 45 are generated by the signal waveform detection circuit 9 for measuring the two vibration transmission times tg and tp described above, and the signal waveform detection circuit 9 is configured as shown in FIG.

FIG. 5 is a block diagram showing the configuration of the signal waveform detection circuit 9 of this embodiment. In FIG. 5, the output signal of the vibration sensor 6a is amplified to a predetermined level by the preamplifier circuit 51. The bandpass filter 511 removes extra frequency components of the detected signal from the amplified signal,
For example, it is input to the envelope detection circuit 52 including an absolute value circuit and a low-pass filter, and only the envelope of the detection signal is extracted. The timing of the envelope peak is the envelope peak detection circuit 53.
Detected by. In the peak detection circuit, a signal tg (signal 43 in FIG. 4) which is an envelope delay time detection signal having a predetermined waveform is formed by the tg signal detection circuit 54 composed of a mono-multivibrator or the like, and is input to the arithmetic control circuit 1.

On the other hand, 55 is a signal detection circuit, and the envelope signal 42 detected by the envelope detection circuit 52.
The pulse signal 47 of the portion exceeding the threshold signal 46 of the predetermined level in 1 is formed. 56 is a monostable multivibrator, which opens the gate signal 44 of a predetermined time width triggered by the first rising edge of the pulse signal 47. Reference numeral 57 denotes a tp comparator, which detects the first rising zero-cross point of the phase signal 422 while the gate signal 44 is open, and supplies the phase delay time signal tp45 to the arithmetic control circuit 1. The circuit described above is for the vibration sensor 6a, and the same circuit is provided for other vibration sensors.

<Description of Circuit Delay Time Correction> The vibration transmission time latched by the latch circuit includes the circuit delay time et and the phase offset time toff.
The error caused by these is always included in the same amount when the vibration is transmitted from the vibration pen 3 to the vibration transmission plate 8 and the vibration sensors 6a to 6d. Therefore, for example, the origin O in FIG.
From the position of R1 to the vibration sensor 6a, for example, R1
(= X / 2), input is made with the vibrating pen 3 at the origin O, and the actually measured vibration transmission time from the origin O to the sensor 6a is tgz ', tpz', and true from the origin O to the sensor. Let tgz and tpz be the transmission times of Tgz '= tgz + et (4) and tpz' = tpz + et + toff (5) with respect to the circuit delay time et and the phase offset toff.

On the other hand, the measured value t at an arbitrary input point P
Similarly, g ′ and tp ′ are tg ′ = tg + et (6) and tp ′ = tp + et + toff (7). When the difference between these (4), (6), (5) and (7) is calculated, tg'-tgz '= (tg + et)-(tgz + et) = tg-tgz (8) tp'-tpz' = (tp + et + toff) − (Tpz + et + toff) = tp−tpz (9), the circuit delay time et and the phase offset toff included in each transmission time are removed, and the position of the detection sensor 6a is set as the starting point between the position of the origin o and the input point P. The true difference in transmission delay time depending on the distance can be obtained, and the distance difference can be obtained by using the equations (2) and (3). Since the distance from the vibration sensor 6a to the origin o is stored in advance in a non-volatile memory or the like and is known, the distance between the vibration pen 3 and the vibration sensor 6a can be determined. The other sensors 6b to 6d can be similarly obtained. The measured values tgz 'and tpz' at the origin O
Is stored in the non-volatile memory at the time of shipment, and (2), (3)
The equations (8) and (9) are executed before the calculation of the equations, and highly accurate measurement can be performed.

<Description of Coordinate Position Calculation (FIG. 6)> Next, the principle of actually detecting the coordinate position on the vibration transmission plate 8 by the vibration pen 3 will be described.

Now, in the vicinity of the midpoint of four sides on the vibration transmission plate 8,
When the two vibration sensors 6a to 6d are provided at the positions S1 to S3, the linear distances da to dd from the position P of the vibration pen 3 to the positions of the respective vibration sensors 6a to 6d are calculated based on the principle described above. You can ask. Further, the arithmetic control circuit 1 can obtain it based on the linear distances da to dd from the theorem of 3 squares of the coordinates (x, y) of the position P of the vibrating pen 3 as follows.

X = (da + db) · (da−db) / 2X (10) y = (dc + dd) · (dc−dd) / 2Y (11) where X and Y are between the vibration sensors 6a and 6b, respectively. The distance is the distance between the vibration sensors 6c and 6d.

As described above, the position coordinates of the vibrating pen 3 can be detected in real time.

In this apparatus, the input operation can be detected by driving the vibrating pen and checking the presence or absence of the sensor output. At this time, it is not necessary to supply power to the vibration detecting means composed of all the sensors and circuits, and if any one or more of the sensors is valid, the presence or absence of the input can be determined, and the power consumption can be reduced.

FIG. 7 is a diagram showing the embodiment. The outputs of the sensors 6a to 6d arranged on the vibration transmission plate 8 are input to the signal waveform detection circuits 7-3 to 7-6 for each sensor. Power for the detection circuits 7-3 to 7-6 is supplied via the transistors 7-1 and 7-2. Here, the transistor 7-1 controls only the power supply of the detection circuit 7-3 of the sensor 6a according to the control signal a, and the transistor 7-2 is
The power supply of the detection circuits 7-4 to 7-6 of the sensors 6b to 6d is controlled by the control signal b. Further, the detection signal is sent to the arithmetic control circuit 1 via the port. When there is no input for a certain period of time, the arithmetic control circuit 1 determines that the input state is not input, changes the operation mode to the sleep mode, turns off the transistor 7-2 by the control signal b, and turns off the detection circuits 7-7 to 7-.
Power supply to 6 is stopped to reduce power consumption. In this state, when input is made by the vibrating pen 3, only the signal detected by the sensor 6a is sent to the arithmetic control circuit 1 as a detection signal through the detection circuit. The arithmetic control circuit 1 monitors only the detection signal of the sensor 6a, and determines the pen input based on the presence or absence of this signal. If it is determined by the detection signal from the sensor a that there is a pen input, the transistor 7-2 is turned on to restart the power supply to all the sensors 6, and the mode is changed to the normal mode. Perform coordinate detection operation.

FIG. 8 is a flow chart for explaining the operation of the arithmetic control circuit 1 for switching between the normal mode and the sleep mode.

When the power of the main body of the coordinate input device is turned on in step S801, the normal operation mode is entered after pre-processing such as determination timer clearing described later is performed in step S802. In step S803, the vibration pen 3 is driven,
In step S804, the detection signal from the sensor is monitored,
If all sensor outputs are complete, coordinates are calculated in step S805, the calculation result is output in step S806, and the determination timer for measuring the non-input time is cleared and restarted in step S807. The set time of this timer may be determined in consideration of the battery life of the device.

After the timer is started, step S8 is performed in order to match the predetermined sampling period for coordinate detection.
At 08, a waiting time is provided to adjust the time, and the coordinate detection operation is continued again.

If it is determined in step S804 that there is no input, the process proceeds to step S809. In step S809, the determination timer is checked to determine whether a predetermined time has passed. If the predetermined time has not elapsed, the interval is adjusted in step S808 to continue the normal operation. If the predetermined time has elapsed, the process advances to step S810 to change to the sleep mode.

In step S810, the transistor 7-2
Is turned off to cut off the power supply to the sensors 6b to 6d, and the pen is driven in step S811. Input from the sensor 6a is monitored in step S812 in response to this pen drive, and if there is an input, the transistor 7-2 is turned on in step S813 to supply power to all the sensors and their detection circuits. In step S814, the timer is cleared / started to return to the normal mode.

If there is no input, the sleep mode interval time is adjusted to be longer than the normal mode interval, and the same operation is repeated until an input is made.

As described above, the input can be detected only by the power consumption of the specific sensor, and the power consumption by other circuits can be suppressed, and the power saving and the power-on operation of the main body are repeated. It is possible to provide a device with good operability without a problem.

Furthermore, in the present embodiment, by turning off the transistor 7-1 during the sleep mode interval adjustment, further power saving can be achieved. For example, when the interval in the sleep mode is set to 50 [msec], the transistor 7-
The power consumption is reduced by waiting in a state where both 1 and 2 are turned off (OFF mode).

Further, in the structure of the present embodiment, by further adding means for judging the no-input time and means for changing the sleep mode interval based on the judgment result, further reduction of power consumption can be achieved. .

In the case of normal input, after input is made for a certain fixed time, input may be made again in a short time, or input may not be made for a long time. When no input is continued for a long time, the operational feeling is less likely to be deteriorated even if the input determination is made for a long period without frequent input determination. Therefore, the non-input time is divided into some judgment times, and the sleep mode intervals are switched according to the judgment times. For example, if the interval of the normal sleep mode is 50 [msec], 100 [msec] is input when there is no input for several minutes, and 200 [msec] when there is no input for several more minutes. In addition, the power consumption can be reduced by changing the interval and using the off mode described above. At this time, the setting of the interval time and the division of the non-input time may be determined by the power supply capacity and power consumption of the device, and are not limited to the described time. To determine the division of the non-input time, the value of the judgment timer is read and compared with a predetermined time, and the interval time corresponding to the time is set in the timer for interval adjustment, etc. , Can be achieved by the method used in the existing computer.

As described above, the vibrations emitted from the vibrating pen are detected by the plurality of sensors provided on the vibration transmission plate of the apparatus main body, and the transmission time required for the detection by each sensor is detected. In the coordinate input device for detecting the position on the vibration transmission plate by the vibrating pen, the power supply for a specific sensor and the means for independently turning on and off the power supply for the other sensor, and the presence or absence of the output of the specific sensor are determined. By having means for controlling the power supply of the main body circuit based on the determination result of the presence / absence of the above input, power saving is achieved, and at the time of input operation, a quick start-up by turning on the power is realized. However, the operability is improved.

Furthermore, by changing the number of detection determinations (interval time) depending on the non-input time of the input, it is possible to provide a low-consumption device without feeling awkward in operation.

In the above embodiment, an ordinary signal detecting circuit as shown in FIG. 5 is used for detecting the input, but by further providing a circuit means dedicated to the detection, it is possible to further reduce the consumption. Is possible.

FIG. 9 shows an example of the configuration, in which the output from the preamplifier is directly input to the comparator 9-3. When the comparator 9-3 detects the signal from the sensor 6, it outputs a detection signal to the arithmetic control circuit 1. In addition, the arithmetic control circuit 1
Switches the transistor 9-1 on / off by the control signal a and turns on / off the power of the comparator 9-3, and switches the transistor 9-1 on / off by the control signal b to turn on / off the power of the block 9-4 in the chain line frame.

In such a circuit configuration, the same control as the transistors 7-1 and 7-2 of the above-described embodiment is performed on the transistors 9-1 and 9-2, so that the block 9 can be operated in the sleep mode. The power consumed at -4 can be cut off, and the power consumption can be further reduced.

Further, in the configuration of FIG. 7, only the signal detection circuit 7-1 of the sensor a has the configuration of FIG. 9 and the other detection circuits 7-4 to 7-6 are left as in FIG. In the mode, the detection circuits 7-4 to 7-6 and the detection circuit 7
The power consumed by the block 9-4 of -1 can be saved.

As described above, a circuit for input determination is provided,
Further power saving can be achieved by operating the power supply separately from the detection circuit.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of a single device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0059]

As described above, the coordinate input device according to the present invention has the advantages of good operability and low power consumption. .

[Brief description of drawings]

FIG. 1 is a diagram showing a block configuration of a coordinate input device.

FIG. 2 is a diagram showing a configuration of a vibrating pen.

FIG. 3 is an internal configuration diagram of a control circuit of the arithmetic control circuit in the embodiment.

FIG. 4 is a time chart of signal processing.

FIG. 5 is a block diagram of a signal detection circuit.

FIG. 6 is a diagram showing a coordinate system of a coordinate system input device.

FIG. 7 is a diagram showing power supply control of sensor output.

FIG. 8 is a flowchart of control.

FIG. 9 is a configuration block diagram of an input detection circuit.

[Explanation of Codes] 1 arithmetic control circuit, 2 vibrator driving circuit, 3 vibration input pen, 4 vibrator, 5 pen tip, 6a to 6d vibration sensor, 7 vibration isolator, 8 vibration transmission plate, 9 signal waveform detection circuit Is.

Front page continued (72) Inventor Yuichiro Yoshimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Katsuyuki Kobayashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Ryozo Yanagisawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (3)

[Claims] 1. A vibration input to a vibration transmission plate is detected,
A coordinate input device for obtaining a coordinate position on the vibration transmission plate based on a delay time of vibration, comprising a plurality of vibration detection means provided on the vibration transmission plate and driven by electric power, and vibrations generated by the vibration detection means. Measuring means for measuring the elapsed time from the detection of the vibration, the judging means for judging that the time measured by the measuring means exceeds a predetermined value, and the plurality of vibrations based on the judgment by the judging means. Among the detection means, a mode transition means that cuts off the power supply power of a predetermined vibration detection means to a sleep mode, and in the sleep mode, based on the vibration detection result by the vibration detection means whose power supply is not cut off, the predetermined vibration A coordinate input device comprising: means for supplying power to the detection means to recover from the sleep mode. 2. The vibration detecting means includes a delay time detecting circuit for detecting a delay time, and a judging circuit for judging a vibration input, and the mode shifting means cuts off the power supply of the delay time detecting circuit. The coordinate input device according to claim 1, wherein: 3. The vibration input to the vibration transmission plate is detected by a plurality of vibration detection means provided on the vibration transmission plate, and the coordinate position where the vibration is input is determined based on the delay time from the vibration input to the detection. A coordinate input device for measuring, which comprises a vibration input means that vibrates intermittently, a plurality of vibration detection means driven by electric power, which are provided on the vibration transmission plate, and a vibration is not detected by the vibration detection means. A coordinate input device comprising: a measuring unit that measures time; and a unit that controls a time interval in which the vibration input unit vibrates based on the time measured by the measuring unit.