JP2005300504A - Ultrasonic position detecting input device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position detecting input device using ultrasonic waves, which transmits the ultrasonic waves having a spread spectrum made by a wide-band ultrasonic wave generator, through a transmitting means, such as a liquid crystal display panel or the like, receives the ultrasonic waves by using a wave receiving device disposed at a required position in the transmitting means and detects the position of the wave generator and its trajectory. <P>SOLUTION: The head section 9 of a touch pen 8 is brought into contact with the surface of a first glass substrate 1 which is the transmitting means, and an ultrasonic signal having a spread spectrum is converted into ultrasonic vibration and is transmitted through the first glass substrate 1. Wave-receiving devices 3-6 are arranged along directions 101-104, and delay timings are generated, which are proportional to respective length values in the transmission, and the position of the head section 9 of the write pen 8 is detected from differences between the delay timings. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a position detection input device using ultrasonic waves, and transmits a spectrum spread ultrasonic wave using a wide-band ultrasonic wave generator through a transmission means such as a liquid crystal display panel and the like. The signal is received by a receiver provided at a certain point, and the position and locus of the generator are detected.

As a typical example of a conventional position detection input device, as in Patent Document 1, since a signal different from the ultrasonic wave is transmitted in a direction opposite to the direction in which the ultrasonic wave is transmitted, the time required for reciprocation is reduced. Those that measure the distance, those that use the difference between the propagation speeds of ultrasonic waves and infrared rays as in Patent Document 2, those that detect the three-dimensional position of a moving body in water as in Patent Document 3, Using an electromagnetic induction type position detection panel, as in Patent Document 5, connecting an ultrasonic signal generator and a receiver with a line and synchronizing them,
A technique for detecting the center of a signal by switching the frequency or phase of an ultrasonic signal in the middle of a burst as in Patent Document 6, and a technique for detecting a signal on the transmitting side according to the output value of an envelope signal on the receiving side as in Patent Document 7. An apparatus for adjusting the magnitude of the sound wave signal to increase the measurement accuracy of the delay time, an apparatus for disposing an ultrasonic transducer having a comb-like electrode as in Patent Document 8, and a surface as in Patent Document 9 In some cases, a reflective array is arranged along two opposite sides of a rectangular substrate through which an elastic wave is transmitted, and in some cases, a resistive film is used.

In Patent Document 1, ultrasonic waves are transmitted in an ultrasonic coordinate input device that transmits ultrasonic waves from a fixed body to a moving body or from a moving body to a fixed body and obtains the position of the moving body based on the propagation time of the ultrasonic waves. The distance is measured from the time required for reciprocation by transmitting a signal (amplitude different or electromagnetic wave including infrared rays or visible rays) different from the ultrasonic waves in a direction opposite to the direction.
In Patent Document 2, ultrasonic waves and infrared rays are simultaneously transmitted, and the distance is measured by utilizing the fact that the delay of ultrasonic waves is large while the infrared rays have almost no time delay.
In Patent Document 3, the mobile body itself measures the depth by measuring the depth of water and communicating with the buoy, and measuring the direction by periodically scanning the direction of the ultrasonic wave from the buoy. Measure the position of the dimension.
In Patent Document 4, an electromagnetic induction type position detection panel is provided at the lower part of the liquid crystal display screen, and the position is detected by bringing a pen that generates an alternating magnetic field closer.
In Patent Document 5, an ultrasonic transmitter and a receiver are connected by a line and synchronized with a common clock to measure a delay time and detect a position.
In Patent Document 6, in which the center of a signal is detected by switching the frequency or phase of the ultrasonic signal in the middle of a burst, the magnitude of the ultrasonic signal on the transmitting side is determined according to the output value of the envelope signal on the receiving side. Adjust the length to increase the measurement accuracy of the delay time.
In Patent Document 8, the position of the index finger or the indicator is based on the change of the surface acoustic wave caused by the contact between the propagation path of the surface acoustic wave propagating between the ultrasonic transducers having the interdigital transducer and the index finger or the indicator. Is detected.
In Patent Document 9, an ultrasonic transmission transducer is arranged at the end of one reflection array, a reception transducer is arranged at the end of the other reflection array, and a pulsed longitudinal wave is transmitted from the transmission transducer. The high-order shear wave is transmitted toward the center of the substrate by the reflection array on the transmission side, reflected by the reception reflection array on the opposite side, and received by the receiving transducer provided at the end, and the transmission The contact position is detected by calculating the autocorrelation on the receiving side using ultrasonic waves whose signals are modulated with pseudo-random codes.

JP 2004-102896 A JP 2004-078496 A JP 2003-215230 A Japanese Patent Laid-Open No. 2003-015821 Japanese Patent Laid-Open No. 2003-015813 JP 2002-366292 A JP 2002-358157 A JP 2002-342016 A JP-A-11-327772

In a conventional position detection input device using an ultrasonic signal, an ultrasonic signal and another signal are transmitted in the opposite direction to measure the round trip time, or the transmission time difference between the ultrasonic signal and the infrared signal is measured, or Using electromagnetic induction, or trying to improve accuracy by switching the ultrasonic wave in the middle or seeking an envelope, or providing transducers or reflective arrays continuously on two opposing sides of the touch panel However, there is a problem that the configuration or circuit is complicated, the cost is high, and it is obstructed by noise such as ambient noise.

An ultrasonic position detection input device according to the present invention is made to solve the above-described problems, and transmits a plurality of ultrasonic signals having different carrier frequencies spread from a broadband transmitter of a transmission means. Then, the ultrasonic signal is received by a receiving means provided at least in one place and having a plurality of receivers, and the reception timing of the ultrasonic signals is detected for each receiver to detect the direction of the transmitting means. By detecting the phase difference between a plurality of ultrasonic signals having different carrier frequencies, the distance is detected, thereby realizing a position detection input device that is inexpensive and precise and is not affected by external noise.

In the ultrasonic position detection input device according to the present invention, the position of the transmission means can be detected in detail by receiving the spectrum-spread ultrasonic signal by a plurality of receivers via the transmission means, and the peripheral portion of the transmission means Can eliminate the effects of so-called multi-paths caused by reflections generated by noise and the effects of noise caused by external vibrations or shocks, and because the circuit is simple and the parts are inexpensive, the entire device is inexpensive, and the spread spectrum code By superimposing the data, it is possible to obtain an advantage that information such as the identification number, type or characteristic of the transmission means can be transmitted together.

An ultrasonic position detection input device according to the present invention has a transmitting means for diffusing an ultrasonic signal by a spread spectrum code and transmitting it from a broadband transmitter, and a plurality of receivers provided at intervals. The timing of the ultrasonic signal detected for each receiver by taking a correlation with a matched filter using a high frequency logic circuit after converting the ultrasonic signal into a digital signal in synchronization with the reference oscillator in the receiving means, And a signal detector for detecting amplitude, frequency, or phase or any combination thereof.

An embodiment of the transmission means of the present invention will be described below with reference to FIG. In FIG. 1, 1 is a first glass substrate, 2 is a second glass substrate, 3 is a first receiver, 4 is a second receiver, 5 is a third receiver, and 6 is a first receiver. 4 is a receiver, 7 is a liquid crystal layer, 8 is a light pen, 9 is a front end portion of the light pen 8, 101, 102, 103, and 104 are directions of the front end portion 8 and the four-wave receivers 3 to 6. Distance.
The tip portion 9 of the light pen 8 is brought into contact with the surface of the first glass substrate 1 as a transmission means, and the ultrasonic vibration transmitted from the ultrasonic signal transmitter is transmitted to the first glass substrate 1. It shall be. Here, the first glass substrate 1 is in a floating state with respect to the ultrasonic vibration, and the second glass substrate 2 is provided with the wave receivers 3 to 6 interposed therebetween. It shall be in the state fixed with respect to the sonic vibration.
The ultrasonic vibration transmitted to the first glass substrate 1 becomes a spherical wave centering on the tip portion 9 and spreads to the peripheral portion. In particular, in the directions 101 to 104, the receivers 3 to 6 are used. And is transmitted with a delay time proportional to each length.
The receivers (sensors or transducers) 3 to 6 are in a laminated state between the first glass substrate 1 and the second glass substrate 2, and the second glass substrate 2 is fixed. The ultrasonic vibrations transmitted by the first glass substrate 1 are efficiently converted into electrical signals by the receivers 3 to 6 and received by the receiver.
In the receivers 3 to 6, the ultrasonic vibration is converted into an electric signal, and then converted into a digital signal in synchronization with a reference oscillator, and a matched filter is provided to correlate with the ultrasonic signal. Since the position of the receivers 3-6 is known by detecting the timing, amplitude, frequency, phase, or combination thereof and comparing the receivers 3-6, trigonometry or hyperbola The position of the tip 9 of the light pen 8 can be accurately detected by a method such as navigation.
As another method for detecting the distance, an ultrasonic signal transmitted from the tip portion 9 of the light pen 8 is hopped between a plurality of carrier frequencies, or a plurality of ultrasonic signals having different carrier frequencies and in a synchronized state or orthogonal relationship. Are transmitted simultaneously or alternately, and the plurality of ultrasonic signals received at any one of the receivers 3 to 6 are converted directly or at least into subcarrier signals, intermediate frequency signals, or baseband signals, and timing or amplitude Alternatively, the distance Dm between the tip 9 of the light pen 8 and any one of the receivers 3 to 6 can be measured by detecting the frequency or phase or a combination thereof in real time. For example, the ultrasonic signal transmitted from the tip 9 is hopped by + Δf from the center frequency, and the phase of the carrier wave of the ultrasonic signal received at any one of the receivers 3 to 6 is S1 = ASin, respectively. Assume that {2πf1t + φ0 + 2πD / λ0} and S2 = BSin {2π (f1 + Δf) t + φ0 + 2πD / (λ0−Δλ)}.
When the phases of S1 and S2 are detected, Φ1 = {φ0 + 2πD / λ0} and Φ2 = {φ0 + 2πD / (λ0−Δλ)}, so that Φ2−Φ1 = 2πD {1 / (λ0−Δλ) −1 / λ0} ≈ (2πD / λ0) {(1 + Δλ) -1} = 2πD (Δλ / λ0), and the distance D can be detected by detecting the phase difference (Φ2−Φ1). A similar effect can be obtained by transmitting a plurality of ultrasonic signals having different carrier frequencies simultaneously or alternately instead of hopping from f0 to f0 + Δf.
In the above description, the position of the tip 9 of the light pen 8 is detected. However, when the tip 9 of the light pen 8 is moved, the detected position is moved accordingly, so that the locus is connected. If so, characters or lines can be detected.
In addition, a damper material is attached to the peripheral portion of the first glass substrate to suppress reflection of ultrasonic vibration. Even if the reflection occurs, a signal that is first output from the matched filter beyond the threshold value. The multipath can be removed by using the timing.
If the length of one cycle of the carrier wave of the ultrasonic signal is the same as the length of one chip of the spread spectrum code, the resolution of the delay time is one chip, and the transmission of ultrasonic vibration of the first glass substrate 1 is performed. If the speed is 3 km per second, the resolution is about 0.3 mm if the frequency of the ultrasonic signal is 1 MHz.
When transmitting the ultrasonic vibration from the light pen 8 in a burst shape, the next burst is transmitted after waiting for the ultrasonic vibration to be multiple-reflected and extinguished at the peripheral portion. The next burst can be transmitted continuously without waiting for disappearance by switching the code sequence.
In addition, the light pen 8 sets red, dotted lines, or other data, and superimposes and transmits these data on the spread spectrum code, so that the receivers 3 to 6 receive the ultrasonic waves and output the data from the output. Can be demodulated.
Moreover, the magnitude | size of an amplitude can be detected from the output which received the ultrasonic wave in the receivers 3-6, the pressure added to the said light pen 8 can be detected, and the thickness of a character etc. can be controlled.
Further, by increasing the number of position detections by increasing the number of repetition cycles transmitted in a burst state and increasing the average value, the position detection accuracy can be improved by a square root of the number of averages.

FIG. 2 is a diagram showing a configuration example of the transmitting means of the present invention, in which 11 is a broadband transmitter, 12 is a power amplifier, 13 is a low-pass filter, 14 is a modulator, 15 is a numerically controlled oscillator, and 16 is A reference oscillator, 17 is a spread spectrum code generator, and 18 is a data input terminal.
The numerically controlled oscillator 15 generates a carrier frequency of the ultrasonic signal in synchronization with the reference oscillator 16 and supplies the carrier signal to the modulator 14. A spread spectrum code generator 18 generates a spread code of an M series, a Gold code, a bulk code, or an arbitrary code series in synchronization with the numerically controlled oscillator 15 or the reference oscillator 16, and data input from a data input terminal 18. The code sequence is switched according to the type of the data or the data is superimposed and input to the modulator 14.
The carrier wave signal spectrum-spread by the modulator 14 is removed from the high band by the low-pass filter 13, amplified by the power amplifier 12, and transmitted from the broadband transmitter 11 to the tip 9 of the light pen 8 and transmitted. Is transmitted to.
Here, the numerically controlled oscillator 15 is used to generate the carrier wave signal, but the same effect can be obtained by using an arbitrary signal source such as a normal CR oscillator, LC oscillator, ceramic oscillator, crystal oscillator, or DPLL.
Further, as a relationship between the spread spectrum code and the data, the processing of the receiving means can be simplified by assigning 1 bit of data to an integral multiple of one cycle of the spread spectrum code or 1 / integer.
Further, as a modulation method, the same effect can be obtained by using not only an orthogonal modulator for direct spreading but also a modulator suitable for any spreading method such as frequency hopping, time hopping, or multicarrier spreading code. .
Also, by making the frequency of the carrier signal and the transmission rate of the spread spectrum code the same, one bit of the spread spectrum code can be made to correspond to one cycle of the carrier signal.
Further, when the transmitter 11 has band characteristics, the low-pass filter 13 can be omitted.

FIG. 3 shows an embodiment of the receiving means of the present invention, 31a and 31b are broadband receivers, 32a and 32b are low noise amplifiers having an AGC function, 33a and 33b are analog-digital converters, and 34a and 34b are shifts. Registers 35a and 35b are fixed correlators or matched filters, 36a and 36b are ΣSin product-sum calculators, 37a and 37b are ΣCos product-sum calculators, 38a and 38b are amplitude spectrum detectors, and 39a and 39b are phase spectrum detectors. , 40 is a signal detector, 41 is a reference oscillator, 42a and 42b are AGC control lines, and 43 is a detection output terminal.
The ultrasonic signals received by the broadband receivers 31a and 31b are amplified by the low noise amplifiers 33a and 33b having the AGC function, and converted into digital signals in synchronization with the reference oscillator 41 by the analog / digital converters 33a and 33b. The data is input to the shift registers 34a and 34b. The sampling period of the analog-digital converters 33a and 33b is set so that four periods are sampled during one cycle of the carrier signal.
The fixed correlator 35a, 35b is set with a code sequence for one period of the spread spectrum code of the transmitting means, and correlates in real time with the shift registers 34a, 34b, so that the correlator has a role of a matched filter. Become.
The outputs of the correlators 35a and 35b are summed with the Sin look-up table and output from the ΣSin sum-of-products calculators 36a and 36b. Is done.
The outputs from the ΣSin product-sum calculators 36a and 36b and the outputs from the ΣCos product-sum calculators 37a and 37b are squared and added by the amplitude spectrum detectors 38a and 38b, and further squared to detect the power of the signal output. , The outputs from the ΣSin product-sum calculators 36a and 36b and the outputs from the ΣCos product-sum calculators 37a and 37b are compared by the phase spectrum detectors 39a and 39b, and the phase of the carrier signal is detected. Are demodulated.
The detected amplitude spectrum, phase spectrum, and demodulated data are output from the detection output terminal 43 to an external computing device, computed by the external computing device, and the position of the tip 9 of the light pen 8 is detected and displayed. The
The AGC of the low noise amplifiers 32a and 32b can be controlled via the control lines 42a and 42b so that the inputs of the amplitude spectrum detectors 38a and 38b are not saturated.
Here, in order to simplify the description of the claims, the shift registers 34a and 34b and the fixed correlators 35a and 35b are collectively referred to as correlators, and ΣSin product-sum calculators 36a and 36b, ΣCos product-sum calculator 37a, 37b, amplitude spectrum detectors 38a and 38b, phase spectrum detectors 39a and 39b, and signal detector 40 are referred to as signal detectors.
In the above description, two receivers 31a and 31b are provided. However, when it is necessary to provide receivers at four corners of a liquid crystal display panel or the like, four receivers and four types of receivers are provided. It is necessary to install with a receiver. In this case, since the transmission speed of the electric signal is much higher than the transmission speed of the ultrasonic wave, the delay error caused by the electric circuit can be ignored. Therefore, the four receivers are switched to a single receiver. There is no need to connect to.
The position of the receiver can be detected by providing a transmitter at the four corners of the transmission means and contacting the receiver with the transmission layer.
Further, the Sin lookup table used for the product-sum operation is 0, 1, 0, −1, or 1, 1, −1, −1, an integer multiple or a repetition of an integer, or Cos The lookup table is 1, 0, −1, 0 or 1, −1, −1, 1, or an integer multiple thereof or a repetition of 1 / integer. Real-time computation is possible by obtaining the complement of the digital signal or combining them.
In addition, when the output of the amplitude spectrum exceeds the threshold, it is determined as “1”, or it is determined by performing synchronous detection from the output of the phase spectrum when the output of the amplitude spectrum exceeds the threshold, or from the previous bit It is possible to demodulate an arbitrary modulation signal by performing delay detection from the change in the output and determining “1” or “0”.

In the above description, the case of using a high-frequency logic circuit has been described. However, even if arithmetic processing is performed using a microprocessor or a digital signal processor, the current power consumption will increase, but if it can operate at a high speed and low power in the future, Similar effects can be obtained.
Further, the local frequency of the receiver or the demodulating means can be controlled or the synchronization or tuning can be controlled based on the phase spectrum detectors 39a and 39b.
Further, the numerically controlled oscillator or correlator or demodulating means of the receiving means is composed of a high frequency logic circuit, and in addition to the basic AND, OR, NAND, NOR, INV, and XOR, a latch, a selection circuit, a register, and a shift register , Encoder, decoder, parity circuit, counter, addition circuit, subtraction circuit, multiplication circuit, division circuit, multiplication circuit, converter circuit, correlator, distribution circuit, modulation / demodulation circuit, synchronization circuit, or any combination of comparison circuits Is done.
Further, the product-sum operation or the fast Fourier transform between the digital signal and the Sin and Cos lookup tables can be performed, or the necessary real-time processing can be performed on the digital signal.
Further, the same effect can be obtained even if the transmitting means and the receiving means are replaced, and any fixed object or moving body other than the light pen can be handled.

According to the present invention, it is possible to improve the position detection accuracy of the position detection input device using ultrasonic waves and reduce the cost.

It is a block diagram which shows the Example of the ultrasonic position detection input device of this invention. It is a block diagram which shows the Example of the transmission means of this invention. It is a block diagram which shows the Example of the receiving means of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st glass substrate 2 2nd glass substrate 3 1st receiver 4 2nd receiver 5 3rd receiver 6 4th receiver 7 Liquid crystal layer 11 Broadband transmitter 12 Electric power Amplifier 13 Low-pass filter 14 Modulator 15 Numerically controlled oscillator 16 Reference oscillator 17 Spread spectrum code generator 18 Data input terminals 31a and 31b Wideband receivers 32a and 32b Low noise amplifiers 33a and 33b with AGC function Analog to digital converter 34a , 34b Shift registers 35a, 35b Fixed correlator 36a, 36b ΣSin product-sum calculator 37a, 37b ΣCos product-sum calculator 38a, 38b Amplitude spectrum detector 39a, 39b Phase spectrum detector 40 Signal detection 41 Reference oscillators 42a, 42b AGC control line 43 Detection output terminals 101, 102, 10 , Direction and distance when viewed receivers 3-6 from the distal end portion 9 of the 104 light pen 8

Claims (17)

In the detection system using ultrasound,
A transmitting means for transmitting an ultrasonic signal from a required number of transmitters having a wideband characteristic by spreading the ultrasonic signal using a spread spectrum code; a transmitting means for transmitting the ultrasonic signal transmitted from the transmitting means; and The ultrasonic signal transmitted through the transmission means is constituted by reception means for receiving by a required number of receivers having wideband characteristics,
Transmitter for transmitting the ultrasonic signal generated in synchronization with the reference oscillator directly or by an arbitrary modulation signal and then transmitting the signal continuously by spread spectrum code or in burst form, and the transmitter Having the required number of transmitters to transmit the ultrasonic signal transmitted from the transmitter to the transmission means,
The number of receivers required to amplify or at least convert the ultrasonic signal received by the receiver provided at the periphery of the transmission means to the intermediate frequency signal or the baseband signal. After the output signal of the receiver is converted into a digital signal in synchronization with the reference oscillator and fixed and prepared or repeatedly correlated with the spread spectrum code or after correlation with the spread spectrum code It has a signal detector for detecting in real time the timing, amplitude, frequency, phase, or combination thereof from the number of correlators necessary for conversion into a digital signal and the output signal of the correlator,
The signal detector detects the position of the transmitter of the transmitting means by comparing the timing, amplitude, frequency, phase, or combination thereof detected corresponding to each receiver of the receiving means. Ultrasonic position detection input device
In the detection system using ultrasound,
A transmitting means for transmitting an ultrasonic signal from a required number of transmitters having a wideband characteristic by spreading the ultrasonic signal using a spread spectrum code; a transmitting means for transmitting the ultrasonic signal transmitted from the transmitting means; and The ultrasonic signal transmitted through the transmission means is constituted by reception means for receiving by a required number of receivers having wideband characteristics,
Transmitter for transmitting the ultrasonic signal generated in synchronization with the reference oscillator directly or by an arbitrary modulation signal and then transmitting it continuously by a spread spectrum code or transmitting in burst form and the transmission means The number of transmitters necessary for transmitting the ultrasonic signal transmitted from the transmitter provided in the peripheral portion of the transmitter to the transmission means,
The receiver means amplifies the ultrasonic signal received by the receiver or at least synchronizes the output signals of the receiver with the reference oscillator necessary for converting to an intermediate frequency signal or a baseband signal. The number of correlators required to convert to a digital signal after taking a correlation with the spread spectrum code that is converted to a digital signal and fixed, prepared, or repeatedly generated, and correlated with the spread spectrum code And a signal detector for detecting timing, amplitude, frequency, phase, or a combination thereof in real time from the output signal of the correlator,
The signal detector detects the position of the receiver of the receiving means by comparing the timing, amplitude, frequency, phase, or combination thereof detected corresponding to each transmitter of the transmitting means. Ultrasonic position detection input device
In the transmitting means, an ultrasonic signal is transmitted by hopping between a plurality of carrier frequencies, or a plurality of ultrasonic signals having different carrier frequencies and in a synchronized state or in an orthogonal relationship are transmitted simultaneously or alternately. 3. The distance between the transmitting means and the receiving means is measured by detecting and comparing the timing, amplitude, frequency, phase, or combination thereof in real time, and measuring the distance between the transmitting means and the receiving means. Description of ultrasonic position detection input device
In the transmitting means, the transmission speed of the spread spectrum code for diffusing the ultrasonic signal is changed for transmission, or spread with a plurality of spread spectrum codes having different transmission speeds and code sequences and transmitted simultaneously or alternately. 4. A method according to claim 1, wherein the timing, amplitude, frequency, phase, or combination of the spread codes is detected and compared in real time, and the distance between the transmitting means and the receiving means is measured. Ultrasonic position detection input device
In the case where the spread spectrum code is transmitted continuously in the transmitting means, one period of the spread spectrum code is repeatedly generated or in the case of being transmitted in a burst form, it is configured with at least one period of the spread spectrum code, Correlator for obtaining correlation with one period of spread spectrum code fixedly prepared in the receiving means or correlation for obtaining correlation with spread spectrum code generated in synchronization with the reference oscillator in the receiving means 5. The ultrasonic position detection input device according to claim 1, further comprising a detector.
A plurality of receivers are arranged at intervals in the receiving means, and the transmitting means is compared by comparing the timing, amplitude, frequency, phase, or combination thereof of the ultrasonic signal detected corresponding to each receiver. The ultrasonic position detection input device according to any one of claims 1 to 5, wherein a direction in which the lens is located is detected.
Comparing the timing, amplitude, frequency, phase or combination of a plurality of ultrasonic signals of different carrier frequencies detected corresponding to each receiver of the receiving means to detect the distance to the transmitting means The ultrasonic position detection input device according to any one of claims 1 to 6,
Necessary number of receivers are arranged at intervals in the receiving means or necessary numbers of transmitters are arranged at intervals in the transmitting means to correspond to each of the receivers and the transmitters. The position of the transmitting means or receiving means is detected from the detected direction and distance by comparing the timing, amplitude, frequency, phase, or combination of the detected ultrasonic signals, or the transmission is performed by the trigonometric method or the hyperbolic method. The ultrasonic position detection input device according to any one of claims 1 to 7, wherein the position of said means or receiving means is detected.
The transmission means is composed of a transmission layer for efficiently transmitting the ultrasonic signal and a fixed layer for fixing the receiver, and the transmitter and / or receiver are fixed to the transmission layer. The ultrasonic position detection input device according to any one of claims 1 to 8, wherein the ultrasonic position detection input device has a structure in which the layers are stacked or positioned between layers.
The transmission means is a liquid crystal display panel, and the space along the surface of the protective film of the liquid crystal display panel or the first glass substrate is a transmission layer, and the protective film or the first glass substrate is a fixed layer. The ultrasonic position detection input device according to any one of claims 1 to 9, wherein the receiver or both of them are installed on the protective film or the first glass substrate and have a coordinate input function.
The transmission means is a liquid crystal display panel, and the first glass substrate of the liquid crystal display panel is used as a transmission layer, or a liquid crystal layer intermediate between the first glass substrate and the second glass substrate is used as a transmission layer, or both of them are used. A structure in which the second glass substrate is used as the transmission layer, the transmitter or the receiver, or both of them are laminated or positioned between the first glass substrate and the second glass substrate. 11. An ultrasonic position detection input device according to claim 1, which has a coordinate input function.
The transmission means is an underlay or board or blackboard or display board, and the space along the surface of the underlay or board or blackboard or display board is a transmission layer, and the transmitter or receiver or both are the underlay or board. The ultrasonic position detection input device according to any one of claims 1 to 11, wherein the ultrasonic position detection input device is installed on a blackboard or a display board and has a coordinate input function.
The transmission means is an underlay or board or blackboard or display board, and the underlay or board or blackboard or display board is composed of a transmission layer for efficiently transmitting ultrasonic signals and a fixed layer for fixing the transmission layer. The ultrasonic position detection input device according to any one of claims 1 to 12, wherein
The transmission means is underwater or in the air, and the water or air in the air or air is used as the transmission layer, and the ground or a fixed object or an object having a mass is used as the fixed layer, and the transmitter and / or receiver is both underwater or in the air. 14. The ultrasonic position detection input device according to claim 1, wherein the ultrasonic position detection input device is provided on a fixed layer of the ultrasonic wave.
A function for writing by the transmitter of the transmitting means or the receiver of the receiving means or both of them and a function for transmitting an ultrasonic signal to the transmitting means or receiving an ultrasonic signal from the transmitting means 15. The ultrasonic position detection input device according to claim 1, further comprising:
The code sequence of the spread code for spectrum-spreading the ultrasonic signal transmitted from the transmitting means changes for each transmitter of the transmitting means or every burst transmitted from the transmitting means, or is set in the transmitting means. The ultrasonic position detection according to any one of claims 1 to 15, wherein the ultrasonic position detection is transmitted corresponding to a set value that is changed or superimposed on the spread spectrum code as the set value. Input device
The pressure applied to the transmission layer by the transmitter or receiver is estimated from the magnitude of the amplitude of the ultrasonic signal transmitted from the transmitter and received by the receiver. Item 16. Ultrasonic Position Detection Input Device According to Item 16

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