WO2016117002A1 - Detection device and electronic apparatus - Google Patents

Abstract

A detection device for detecting a resonator that resonates with a radio wave of a predetermined frequency is provided with: a transmission antenna coil which transmits a transmission radio wave of the predetermined frequency; a reception antenna coil which receives an emitted radio wave emitted from the resonator by the energy of the transmission radio wave stored in the resonator that resonates with the transmission radio wave; a detection unit which detects the resonator by detecting the emitted radio wave received by the reception antenna coil; and an energy dissipation circuit which, in order to reduce the influence that the reception antenna coil receives from the transmission antenna coil by the interaction between the transmission antenna coil and the reception antenna coil, dissipates electromagnetic energy stored in the reception antenna coil at a timing when the reception antenna coil starts the reception of the emitted radio wave.

Description

Detection device and electronic device

The present invention relates to a detection device and an electronic device.

In recent years, a technology for realizing a target function by transmitting radio waves and electromagnetic waves between spatially separated devices is becoming widespread in various fields.

For example, RFID (Radio Frequency IDentifier) and wireless charging have been put into practical use. Also, in the fields of tablet terminals, game terminals, CAD (Computer Aided Design) terminals, etc., data input using an electronic pen employing an electromagnetic induction method has been realized (see, for example, Patent Document 1 and Patent Document 2). ).

JP 2000-172447 A JP 2013-250702 A

When a function is to be realized by transmitting radio waves and electromagnetic waves between such spatially separated devices, the radio waves and electromagnetic waves are reliably transmitted from the transmitting device to the receiving device. There is a need.

Therefore, in these devices, in order to improve the reception sensitivity, various optimizations are made with respect to the type and size of the antenna, the frequency and intensity of the radio wave, etc., in each device on the transmission side and reception side.

However, a receiving antenna that receives radio waves and electromagnetic waves accumulates electromagnetic energy due to various influences such as radio waves and electromagnetic waves in the external environment even when radio waves and electromagnetic waves are not received from the transmitting antenna. And the detection ability of the electromagnetic wave transmitted from the transmission antenna and electromagnetic waves may fall by the influence of the electromagnetic energy accumulate | stored in this receiving antenna.

The present invention has been made in view of the above problems, and an object thereof is to make it possible to further improve the ability to detect radio waves and electromagnetic waves by a receiving antenna.

A detection device according to one aspect is a detection system that detects a resonator that resonates with a radio wave of a predetermined frequency, the transmitting antenna coil that transmits the transmission radio wave of the predetermined frequency, and the resonator that receives the transmission radio wave A receiving antenna coil that receives the emitted radio wave emitted from the resonator by the energy of the transmitting radio wave accumulated in the detector, and a detector that detects the resonator by detecting the emitted radio wave received by the receiving antenna coil And at the timing when the reception antenna coil starts receiving the emitted radio wave in order to reduce the influence of the reception antenna coil from the transmission antenna coil due to the interaction between the transmission antenna coil and the reception antenna coil. Energy that dissipates electromagnetic energy stored in the receiving antenna coil It includes an over dissipation circuit.

The other problems disclosed by the present application and the solutions thereof will be clarified by the description in the column of the embodiment for carrying out the invention and the description of the drawings.

It becomes possible to further improve the detection ability of radio waves and electromagnetic waves by the receiving antenna.

It is a figure which shows the structure of the electronic device which concerns on embodiment. It is a figure which shows the structure of the main body apparatus which concerns on embodiment. It is a figure which shows the pen which concerns on embodiment. It is a figure which shows the driver circuit which concerns on embodiment. It is a figure which shows the mode of transmission and reception of the electromagnetic wave which concerns on embodiment. It is a figure which shows the mode of transmission and reception of the electromagnetic wave which concerns on embodiment. It is a figure which shows the mode of transmission and reception of the electromagnetic wave which concerns on embodiment. It is a figure which shows the frequency table which concerns on embodiment. It is a figure which shows the position of the pen in the panel part which concerns on embodiment. It is a figure which shows the position specific table which concerns on embodiment. It is a figure which shows the driver circuit which concerns on embodiment. It is a figure which shows the driver circuit which concerns on embodiment. It is a figure which shows the position of the pen in the panel part which concerns on embodiment. It is a figure which shows the structure of the detection apparatus which concerns on embodiment. It is a figure which shows the structure of the detection apparatus which concerns on embodiment. It is a figure which shows the structure of the to-be-detected body which concerns on embodiment. It is a figure which shows the frequency table which concerns on embodiment.

At least the following matters will become clear from the description of this specification and the accompanying drawings.

In each embodiment described below, components having the same function are denoted by the same reference numerals, and redundant description is appropriately omitted.

However, this does not mean that a plurality of constituent elements with the same reference number must have the same function, and a plurality of constituent elements with different reference numbers have the same function. It doesn't mean that it doesn't become.
== First Embodiment ==
FIG. 1 is a diagram showing a configuration of an electronic device 600 that is one form of a detection system according to an embodiment of the present invention. Electronic device 600 accepts input of information by a user using pen (pen-type resonator) 1000.

The electronic device 600 according to the present embodiment is, for example, an information device such as a tablet terminal, a mobile phone, a smartphone, a personal computer, or an electronic blackboard system.

The pen 1000 is a device used for a user to input various information to the electronic device 600. As will be described later, the pen 1000 according to the present embodiment includes various types having different colors. For example, when the red pen 1000 is used, the electronic device 600 can draw a red line drawing.

The electronic device 600 includes a main body configuration unit 630, an LCD (Liquid Crystal Display) unit 620, and a panel unit 610.

The main body component 630 incorporates various electronic circuits and batteries for controlling the electronic device 600. The electronic device 600 is controlled by an electronic device control unit 900 (described later) built in the main body configuration unit 630, and various functions as the electronic device 600 are realized.

The LCD unit 620 is a planar display device (display device) attached to the main body configuration unit 630, and is controlled by the electronic device control unit 900, such as characters, graphics, images, videos, and further on the panel unit 610. Various information such as a line drawing along the trajectory of the pen 1000 is displayed.

The panel unit 610 is a planar and transparent member that is attached to the surface of the LCD unit 620 opposite to the surface facing the main body component 630, and accepts input of information by the user using the pen 1000. . The panel unit 610 is made of, for example, transparent glass or resin.

The LCD unit 620 and the panel unit 610 according to the present embodiment have a rectangular planar shape, and are mounted at predetermined mounting positions formed in the main body constituting unit 630. The shapes of the LCD unit 620 and the panel unit 610 are not limited to planar rectangles, but may be wide and generally polygonal. Further, it may be circular or elliptical, and may have a curved surface instead of a flat surface.

FIGS. 2 to 3 are diagrams showing a configuration provided for the electronic device 600 according to the present embodiment to accept an input operation with the pen 1000. FIG. In FIG. 2, the LCD unit 620 is omitted.

First, the configuration of the pen 1000 according to the present embodiment will be described with reference to FIG.

The pen 1000 is a device used to input various types of information to the electronic device 600, and includes a hollow cylindrical pen body 1200 having an open tip and a resonance resonance circuit 1100 housed in the pen body 1200. Configured.

The resonant resonance circuit 1100 is formed so as to be tuned to the radio wave having the frequency f, and efficiently absorbs the energy of the radio wave having the frequency f. In this way, the resonant resonance circuit 1100 accumulates energy by contactless power feeding (also referred to as wireless power feeding). The resonant resonance circuit 1100 includes a rod-shaped ferrite 1110 provided so that one end protrudes from the opening at the tip of the pen body 1200 as a pen tip, a coil 1121 wound around the ferrite 1110, and an electric current to the coil 1121. And a capacitor 1122 that constitutes an LC circuit together with the coil 1121.

It should be noted that the inductance of the coil 1121 and the capacitance of the capacitor 1122 included in the resonant resonance circuit 1100 are set so that the Q value of the LC circuit is increased (a predetermined value or more). For this reason, the resonant resonance circuit 1100 temporarily stores the received radio wave energy of the frequency f in an LC circuit including the coil 1121 and the capacitor 1122, and stores the stored radio wave energy (accumulated energy) at the frequency f. Is transmitted as a radio wave. That is, in the LC circuit of the resonant resonance circuit 1100, radio wave energy is accumulated and released with a delay, and the radio wave energy (accumulated energy) released with a delay is regarded as transmission of a radio wave of frequency f.

The pen 1000 according to the present embodiment has a plurality of types. The type of the pen 1000 is, for example, the color or thickness of dots or lines displayed on the LCD unit 620 when the pen tip is brought into contact with the panel unit 610 or when the pen tip is moved along the panel unit 610. , Depending on at least one of the patterns.

The frequency f with which the resonant resonance circuit 1100 included in the pen 1000 is tuned is determined to be different depending on the type of the pen 1000. For example, when the case where the pen 1000 is classified into a plurality of types according to the color is exemplified, the black pen 1000 is tuned to a frequency of 140 kHz (kilohertz) as defined in the frequency table 891 shown in FIG. Thus, the inductance of the coil 1121 and the capacitance of the capacitor 1122 in the resonant resonance circuit 1100 are set.

Therefore, for example, when the black pen 1000 receives a radio wave with a frequency of 140 kHz, the stored energy is stored in the LC circuit more than when a radio wave other than 140 kHz is received, and the emitted radio wave is emitted with a larger energy. send.

Next, the configuration of the electronic device 600 will be described with reference to FIG.

The electronic device 600 includes a panel unit 610, an LCD unit 620 (not shown in FIG. 2), a transmission / reception control unit 820, an electronic device control unit 900, and a plurality of antenna coils 710. Yes.

Among these, the transmission / reception control unit 820, the electronic device control unit 900, and the plurality of antenna coils 710 are accommodated in the main body configuration unit 630. Among these, the transmission / reception control unit 820 and the electronic device control unit 900 also function as an antenna control unit that controls the antenna coil 710.

The antenna coil 710 includes an air-core coil. This air-core coil is configured by winding a coil in a hollow space. FIG. 2 shows five antenna coils 710A, 710B, 710C, 710D, and 710E as the antenna coil 710.

The antenna coil 710A is arranged as a loop antenna so as to surround the panel 610, and functions as a transmission antenna coil and a reception antenna coil described later. The antenna coils 710B, 710C, 710D, and 710E are arranged at corners around the panel unit 610 with the winding axis of the air-core coil crossing the panel unit 610, and function as a receiving antenna coil to be described later. To do.

The antenna coils 710B, 710C, 710D, and 710E may be configured by winding a coil around a core such as ferrite. By using such antenna coils 710B, 710C, 710D, and 710E, there is an advantage that directivity can be improved and the number of turns of the coil can be reduced.

The transmission antenna coil described above is an antenna that transmits radio waves (transmission radio waves) having a predetermined frequency f. This transmitted radio wave is received most efficiently by the pen 1000 that is tuned to the frequency f. As described above, the pen 1000 transmits the accumulated transmission radio wave energy (accumulated energy) as an emission radio wave of frequency f.

On the other hand, the receiving antenna coil is an antenna that receives the emitted radio wave emitted from the pen 1000.

As described above, since the electronic apparatus 600 according to the present embodiment is configured to arrange the transmission antenna coil and the reception antenna coil around the panel unit 610, it is necessary to arrange the antenna on the surface of the panel unit 610. There is no. Therefore, the electronic apparatus 600 according to the present embodiment can input information with the pen 1000 incorporating a resonance / resonance circuit for radio waves or electromagnetic waves without reducing the transparency of the panel unit 610.

In addition, the antenna coil 710 according to the present embodiment has a panel portion so that the winding axis of the air-core coil is directed in a direction intersecting the panel portion 610 (for example, a direction orthogonal thereto) and the winding axes are parallel to each other. 610 is arranged around the periphery. According to such an aspect, the directivity directions of the antenna coils 710 can be aligned, so that the radio waves emitted from the pen 1000 can be received with higher sensitivity.

Further, by causing the antenna coil 710A according to this embodiment to function as a loop antenna, it is possible to efficiently perform non-contact power feeding (also referred to as wireless power feeding) from the antenna coil 710A to the pen 1000. In addition, like the antenna coil 710 </ b> A according to the present embodiment, by using the loop antenna as the transmitting antenna coil and the receiving antenna coil, it is possible to detect the pressing force, that is, the writing pressure when the pen 1000 is brought into contact with the panel 610. It becomes. Furthermore, by detecting this writing pressure and combining it with a separate control logic, it is possible to control the cause (power up) of the electronic device 600.

In the electronic device 600 shown in FIG. 2, the case where the four antenna coils 710B, 710C, 710D, and 710E that function as reception antenna coils are arranged at the corners of the panel unit 610 is shown. Four or more antenna coils 710 may be used, and the antenna coil 710 may be disposed at a place other than the corner of the panel unit 610. With such an aspect, the position of the pen 1000 can be specified more accurately. Note that a method for the electronic device 600 according to the present embodiment to specify the position of the pen 1000 will be described later.

Further, the electronic device 600 may have a configuration in which the receiving antenna coil is not disposed in the corner portion as long as the receiving antenna coil is disposed around the panel portion 610. Further, the number of antenna coils 710 constituting the receiving antenna coil may be three.

The antenna coils 710A, 710B, 710C, 710D, and 710E are respectively connected to a driver circuit 500 included in a transmission / reception control unit 820 described later.

Then, when the electronic device control unit 900 controls the driver circuit 500, transmission of the transmission radio wave by the antenna coil 710A and reception of the emission radio wave by the antenna coils 710A, 710B, 710C, 710D, 710E are controlled.

The driver circuit 500 is individually provided in the antenna coils 710A, 710B, 710C, 710D, and 710E, and the electronic device control unit 900 controls the antenna circuits 710A and 710B by controlling the driver circuits 500 in parallel. , 710C, 710D, and 710E receive the emitted radio waves simultaneously in parallel.

By controlling in this way, the transmission / reception control unit 820 can simultaneously process the emitted radio waves received by the plurality of receiving antenna coils in parallel, and can speed up the position specifying process of the pen 1000. Become.

In addition, as shown in FIG. 5, the electronic device control unit 900 transmits transmission radio waves (periods indicated by T1 and T3) by a transmission antenna coil (antenna coil 710A in the present embodiment) and a reception antenna coil (in this embodiment). The transmission antennas described above are alternately and repeatedly received at predetermined intervals (periods indicated by T2 and T4) and received by the antenna coils 710A, 710B, 710C, 710D, and 710E. Control coil and receive antenna coil. The emitted radio wave emitted from the pen 1000 is indicated by the symbol S in FIG.

In this manner, the transmission antenna coil does not transmit the transmission radio wave from the transmission antenna coil during the period in which the reception antenna coil receives the radio emission from the pen 1000. Therefore, the reception antenna coil efficiently transmits the radio emission from the pen 1000. Thus, the position specifying accuracy of the pen 1000 can be improved. Details will be described later.

Returning to FIG. 2, the transmission / reception control unit 820 includes an oscillation circuit 730, a driver circuit 500, a filter circuit 840, a detection circuit 850, AD conversion circuits 860 and 861, a signal analysis unit (detection unit) 870, The position specifying table 890 and the frequency table 891 are included.

In FIG. 2, for simplification of description, the driver circuit 500, the filter circuit 840, the detection circuit 850, and the AD conversion circuit 860 are shown one by one, but the antenna coils 710A, 710B, It is provided for each of 710C, 710D, and 710E.

The oscillation circuit 730 is a circuit that generates an AC voltage so that a transmission radio wave having a frequency f is transmitted from the transmission antenna coil. The frequency of the AC voltage generated by the oscillation circuit 730 is controlled by the electronic device control unit 900.

Specifically, the electronic device control unit 900 is different each time a transmission radio wave is transmitted when transmission of a transmission radio wave by the transmission antenna coil and reception of an emission radio wave from the pen 1000 by the reception antenna coil are alternately performed. The frequency of the alternating voltage generated by the oscillation circuit 730 is changed so that the frequency is transmitted.

More specifically, the electronic device control unit 900 controls the oscillation circuit 730 so that the transmission radio wave is sequentially transmitted at each frequency set corresponding to the type of the pen 1000. When the electronic device control unit 900 completes transmission of the transmission radio wave at each frequency corresponding to the type of the pen 1000, the electronic device control unit 900 repeats transmission of the transmission radio wave at each frequency again.

The AC voltage generated by the oscillation circuit 730 is input to the driver circuit 500 as a transmission signal and amplified. A transmission radio wave is transmitted from the transmission antenna coil. Details of the driver circuit 500 will be described later.

Radio waves emitted from the pen 1000 are received by the antenna coils 710A, 710B, 710C, 710D, and 710E, respectively, and the driver circuits 500 and filter circuits connected in parallel to the antenna coils 710A, 710B, 710C, 710D, and 710E, respectively. The signal is amplified, noise-removed, and demodulated by the detection circuit 850 and the detection circuit 850, converted into a digital signal by the AD conversion circuit 860, and then input to the signal analysis unit 870.

The signal analysis unit 870 detects the pen 1000 by detecting the emitted radio wave received by the receiving antenna coil. The signal analysis unit 870 includes a reception intensity detection unit 871 and a position specifying unit 872.

The reception intensity detection unit 871 detects the reception intensity of each of the radio waves emitted from the pen 1000 received by a plurality of reception antenna coils (antenna coils 710A, 710B, 710C, 710D, 710E).

Specifically, the reception intensity detector 871 measures the reception intensity (RSSI) of radio waves emitted from the pen 1000 received by the antenna coils 710A, 710B, 710C, 710D, and 710E at predetermined time intervals, and stores them in a memory (not shown). ) Is recorded. The received intensity detector 871 detects the frequency f of the transmission radio wave transmitted from the antenna coil 710A based on the signal from the oscillation circuit 730 input via the AD conversion circuit 861.

Thus, the radio waves emitted from the pen 1000 received by the antenna coils 710A, 710B, 710C, 710D, and 710E are taken into the transmission / reception control unit 820.

In addition, as described above, the electronic device control unit 900 transmits transmission radio waves by the transmission antenna coil (antenna coil 710A) and emits radio waves by the plurality of reception antenna coils (antenna coils 710A, 710B, 710C, 710D, 710E). The driver circuit 500 of each antenna coil 710 is controlled so that reception is repeatedly performed alternately.

Specifically, as shown in FIG. 5 (the same applies to FIG. 6 and FIG. 7), a transmission radio wave is transmitted from the transmission antenna coil during the period indicated by T1, and is emitted from the pen 1000 by the reception antenna coil during the period indicated by T2. A radio wave is received, a transmission radio wave is transmitted from the transmission antenna coil during a period indicated by T3, and a radio wave emitted from the pen 1000 is received by the reception antenna coil during a period indicated by T4.

As shown in FIG. 5, when a transmission radio wave is transmitted from the transmission antenna coil at the timing of t1 (same as t3), the pen 1000 temporarily stores the energy of the transmission radio wave in the resonance resonance circuit 1100. Since the resonant resonance circuit 1100 includes the ferrite 1110, the time required for the energy accumulated in the resonant resonance circuit 1100 to be saturated is longer than that required when the resonance 1110 is not included. FIG. 5 shows that it takes time from t1 to t11 until the energy accumulated in the resonant resonance circuit 1100 is saturated.

Similarly, as shown in FIG. 5, when the transmission of the transmission radio wave from the transmission antenna coil is completed at the timing of t2 (same as t4), the pen 1000 uses the stored energy accumulated in the resonance resonance circuit 1100 as the emission radio wave. However, since the resonance resonance circuit 1100 is configured to include the ferrite 1110, the time required for releasing the energy from the resonance resonance circuit 1100 is longer than that required when the resonance resonance circuit 1100 is not included. . FIG. 5 shows that the release of the stored energy stored in the resonant resonance circuit 1100 requires time from t2 to t22. The emitted radio wave emitted from the pen 1000 is indicated by the symbol S in FIG.

The reception intensity detector 871 detects the radio waves emitted from the pen 1000 between t2 and t22, and detects the reception intensity of the radio waves received by each of the plurality of reception antenna coils.

The position specifying unit 872 specifies the position of the pen 1000 in the panel unit 610 based on the reception intensity of each of the emitted radio waves received by each receiving antenna coil (antenna coils 710A, 710B, 710C, 710D, 710E).

For example, assume that the tip of the pen 1000 touches the position P (coordinates (i, j)) of the panel unit 610 shown in FIG. Then, the radio waves emitted from the pen 1000 are received by the plurality of receiving antenna coils (antenna coils 710A, 710B, 710C, 710D, and 710E), respectively.

The received intensity of the emitted radio wave decreases as the position of P moves away from the receiving antenna coil, and in principle decreases in inverse proportion to the square of the distance between the position of P and each receiving antenna coil.

Therefore, the position specifying unit 872 uses the received intensity of the emitted radio waves received by the four antenna coils 710B, 710C, 710D, and 710E to calculate the value of the coordinates (i, j) of the position P on the panel unit 610. Ask. Specifically, the position specifying unit 872 calculates the relative ratios of the received intensities of the radio waves received by the four antenna coils 710B, 710C, 710D, and 710E, and displays “ The position coordinates (i, j) of P are specified by searching for the row having the value closest to the relative ratio of the received intensity with reference to the columns “B”, “C”, “D”, and “E”.

In the “B” column, “C” column, “D” column, and “E” column of the position specifying table 890B, the antenna coils 710B, 710C, 710D, and 710E measured by a prior experiment or the like receive. The relative ratio of the received radio wave intensity is recorded for each position coordinate (i, j) on the panel unit 610 of the pen 1000.

As described above, the position specifying unit 872 specifies the position of the pen 1000 in the panel unit 610 based on the reception intensity of the emitted radio wave detected by the reception intensity detection unit 871.

Then, the position specifying unit 872 specifies the position of the pen 1000 (P point in FIG. 9) and notifies the electronic device control unit 900 of it.

And the electronic device control part 900 performs the process for making a point draw in the position of P point of FIG. 9 with respect to the LCD part 620, for example.

As in this embodiment, by specifying the position of the pen 1000 using the position specifying table 890, complicated calculation such as a sine function is performed when calculating the position of the pen 1000 from the reception intensity of the emitted radio wave. Since it becomes unnecessary, the electronic apparatus 600 can specify the position of the pen 1000 in a shorter time.

The emitted radio wave emitted from the pen 1000 attenuates with time as indicated by the symbol S in FIGS. For this reason, it is preferable that the reception intensity detector 871 detects the reception intensity of the emitted radio wave at a timing closer to the timing at which transmission of the transmission radio wave from the transmission antenna coil stops (t2 shown in FIGS. 5 and 7). If the reception intensity detection unit 871 can detect the reception intensity of the emitted radio wave at such an earlier timing, the reception intensity detection unit 871 can detect the emission radio wave when the reception intensity is higher. Even if the distance from the coil is increased, the position of the pen 1000 can be specified. Therefore, even if the electronic device 600 has a larger screen, an information input operation using the pen 1000 can be performed.

By the way, as described above, the transmission / reception control unit 820 transmits the transmission radio wave from the transmission antenna coil while sequentially switching the respective frequencies set corresponding to the type of the pen 1000.

For example, as shown in FIGS. 6 and 7, the transmission / reception control unit 820 transmits a transmission radio wave at a frequency of 140 kHz tuned to the black pen 1000 in the period T1, and a frequency tuned to the red pen 1000 in the period T3. The transmission radio wave is transmitted at 149 kHz, and in the period T5, the transmission radio wave is transmitted at a frequency of 158 kHz that is tuned to the green pen 1000.

At this time, when the pen 1000 that is in contact with the panel unit 610 is green, the pen 1000 includes the resonance resonance circuit 1100 that is tuned to the transmission radio wave of 158 kHz. The reception intensity received by the reception antenna coil in the period T6 is relatively larger than the reception intensity received by the reception antenna coil in each period other than T6 such as the periods T2 and T4.

As described above, the intensity of the emitted radio wave received by the receiving antenna coil changes every time the receiving antenna coil receives the emitted radio wave according to the type of the pen 1000.

For this reason, the position specifying unit 872 uses the fact that the reception intensity of the emitted radio wave changes every time the reception antenna coil receives the emitted radio wave, and based on the reception intensity of the emitted radio wave detected by the reception intensity detecting unit 871. Thus, the type of the pen 1000 can be specified.

In this way, the position specifying unit 872 specifies the position (point P in FIG. 9) and type (green) of the pen 1000 and notifies the electronic device control unit 900 of the position.

Then, the electronic device control unit 900 performs, for example, processing for the LCD unit 620 to draw a point of thickness (size) and color corresponding to the type of the pen 1000 at the position of the point P in FIG.

In addition, the electronic device control unit 900 may perform control of the transmission antenna coil and the reception antenna coil separately in a first mode and a second mode described below.

In the first mode, the electronic device control unit 900 alternately repeats transmission of a transmission radio wave from only the antenna coil 710A and reception of an emission radio wave only by the antenna coil 710A with a first predetermined time as a cycle. Each driver circuit 500 is controlled. At this time, the first predetermined time is, for example, about 0.1 second or 1 second. In the first mode, both the transmitting antenna coil and the receiving antenna coil are only the antenna coil 710A.

In the first mode, when the pen 1000 is close to the panel unit 610 and the radio wave emitted from the pen 1000 is received by the antenna coil 710A, the reception intensity of the radio wave detected by the reception intensity detector 871 is set to a predetermined value. The threshold is exceeded.

Then, the electronic device control unit 900 switches the control of the transmission antenna coil and the reception antenna coil to the second mode. In the second mode, the electronic device control unit 900 repeats the transmission of the transmission radio wave only from the antenna coil 710A and the reception of the radio emission emitted by the antenna coils 710A, 710B, 710C, 710D, and 710E, respectively. The driver circuit 500 is controlled. The transmission / reception switching cycle at this time is set to a second predetermined time shorter than the first predetermined time. The second predetermined time is, for example, about 10 milliseconds, 1 millisecond, or 100 microseconds or less.

Thereafter, when the pen 1000 is separated from the panel unit 610 in the second mode, the radio waves emitted from the pen 1000 are not received by the antenna coils 710A, 710B, 710C, 710D, and 710E. When the reception intensity of the emitted radio wave detected by the reception intensity detection unit 871 continues for a predetermined time and does not exceed the threshold value, the electronic device control unit 900 returns control to the first mode again.

According to such an aspect, power consumption when the pen 1000 is not close to the panel unit 610 can be suppressed, and when the pen 1000 is close to the panel unit 610, the position of the pen 1000 can be quickly identified. Thus, it is possible to switch to control that enables input of information by the pen 1000.

Next, the driver circuit 500 according to the present embodiment will be described with reference to FIGS. 4, 7, 11, and 12. Here, in order to simplify the description, a case will be described as an example where the pen 1000 has three colors of black, red, and green, and different frequencies are assigned to each color.

As illustrated in FIG. 4, the driver circuit 500 includes a transmission amplifier 510, a reception amplifier 520, a capacitor 521, a frequency switching circuit 530, an energy dissipation circuit 540, and a damping resistor 550. The

The driver circuit 500 receives the control signal output from the electronic device control unit 900, the changeover switch signals (A), (B), and (C), and the energy dissipation signals (A), (B), and (C). Yes.

The transmission amplifier 510 amplifies the transmission signal of the frequency f output from the oscillation circuit 730 and outputs it. The transmission signal amplified by the transmission amplifier 510 is output from the driver circuit 500 via the frequency switching circuit 530.

The reception amplifier 520 acquires the reception signal of the radio wave emitted from the pen 1000 received by the antenna coil 710 via the frequency switching circuit 530 and the capacitor 521, amplifies it, and outputs it. The reception signal amplified by the reception amplifier 520 is output from the driver circuit 500 and input to the filter circuit 840.

The control signal is input from the electronic device control unit 900 to the driver circuit 500, and causes the transmission amplifier 510 and the reception amplifier 520 to function complementarily as shown in FIGS.

In this embodiment, since the antenna coils 710B, 710C, 710D, and 710E do not function as transmission coil antennas, they are connected to the antenna coils 710B, 710C, 710D, and 710E during the periods T1, T3, and T5 in FIG. Each driver circuit 500 receives a control signal from the electronic device control unit 900 so that the reception amplifier 520 functions without causing the transmission amplifier 510 to function. Alternatively, during the periods T1, T3, and T5, for example, a halt signal (not shown) may be input from the electronic device control unit 900 to these driver circuits 500 to stop the function.

Referring back to FIG. 4, the capacitor 521 is an AC coupling capacitor that blocks the DC signal and passes the AC signal.

The damping resistor 550 is a resistance element used to reduce signal noise generated in the antenna coil 710.

The frequency switching circuit 530 includes a selector switch 532A controlled by the selector switch signal (A), a selector switch 532B controlled by the selector switch signal (B), and a selector switch 532C controlled by the selector switch signal (C). , A capacitor 531A connected to the changeover switch 532A, a capacitor 531B connected to the changeover switch 532B, and a capacitor 531C connected to the changeover switch 532C.

The capacity of the capacitor 531A is set corresponding to the frequency assigned to the black pen 1000, and the capacity of the capacitor 531B is set corresponding to the frequency assigned to the red pen 1000. The capacity of the capacitor 531C is set corresponding to the frequency assigned to the green pen 1000.

Then, as shown in FIG. 7, the changeover switch 532A transmits the transmission radio wave having the frequency assigned to the black pen 1000 from the transmission antenna coil, and the emission radio wave from the pen 1000 corresponding to the transmission radio wave is transmitted from the reception antenna coil. Turns on during the receiving period (period of T1, T2).

The changeover switch 532B transmits a transmission radio wave having a frequency assigned to the red pen 1000 from the transmission antenna coil, and receives a radio wave emitted from the pen 1000 corresponding to the transmission radio wave from the reception antenna coil (T3 and T4). Period).

The change-over switch 532C transmits a transmission radio wave having a frequency assigned to the green pen 1000 from the transmission antenna coil, and receives a radio wave emitted from the pen 1000 for the transmission radio wave from the reception antenna coil (periods T5 and T6). )

Returning to FIG. 4, the energy dissipation circuit 540 includes an energy dissipation switch 542A controlled by an energy dissipation signal (A), an energy dissipation switch 542B controlled by an energy dissipation signal (B), and an energy dissipation signal (C). , An energy dissipation switch (542) connected to the energy dissipation switch 542A, an energy dissipation resistor (impedance element) 541B connected to the energy dissipation switch 542B, and an energy dissipation switch 542C. And an energy dissipation resistor (impedance element) 541C connected thereto.

The resistance value of the energy dissipation resistor 541A is set corresponding to the frequency assigned to the black pen 1000, and the resistance value of the energy dissipation resistor 541B corresponds to the frequency assigned to the red pen 1000. The resistance value of the energy dissipation resistor 541C is set corresponding to the frequency assigned to the green pen 1000.

Then, as shown in FIG. 7, the energy dissipation switch 542A starts receiving the emitted radio wave by the receiving antenna coil after the transmitting radio wave having the frequency assigned to the black pen 1000 is transmitted from the transmitting antenna coil. It is turned on for a predetermined time at the timing (timing of starting T2).

The energy dissipation switch 542B is a timing (start timing of T4) at which reception of the emitted radio wave by the reception antenna coil is started after the transmission radio wave of the frequency assigned to the red pen 1000 is transmitted from the transmission antenna coil. Turns on for a predetermined time.

The energy dissipation switch 542C is a timing (start timing of T6) at which reception of the emission radio wave by the reception antenna coil is started after the transmission radio wave of the frequency assigned to the green pen 1000 is transmitted from the transmission antenna coil. Turns on for a predetermined time.

In this way, the driver circuit 500 converts the electromagnetic energy remaining in the reception antenna coil to the transmission radio wave transmitted from the transmission antenna coil most recently at the timing when the reception of the emission radio wave by the reception antenna coil is started. The energy dissipation resistor 541 corresponding to the frequency is consumed. By doing in this way, it becomes possible to reduce the influence which a receiving antenna coil receives from a transmitting antenna coil by interaction with a transmitting antenna coil and a receiving antenna coil.

Describing in more detail with reference to FIG. 7, the transmission radio wave is transmitted from the transmission antenna coil (antenna coil 710A) in the T1 period of FIG. The energy of the transmission radio wave is absorbed by the pen 1000 as described above, but is absorbed not only by the pen 1000 but also by the antenna coil 710A itself and the antenna coils 710B, 710C, 710D, and 710E.

When the period T2 starts in this state, the transmission radio wave from the transmission antenna coil stops and transmission of the radio wave emission from the pen 1000 starts. However, each reception antenna coil receives the transmission antenna coil and the reception during the period of T1. Since the energy of the transmission radio wave remains due to the interaction with the antenna coil, the level of the reception signal input to the reception amplifier 520 (the signal level indicated by R2 in FIG. 7) is the current level even if the period T2 begins. Over a period (period indicated by TB in FIG. 7), the state continues to be higher than the level of the received signal of the radio wave emitted from the pen 1000 (signal level indicated by S in FIG. 7). Therefore, the radio wave emitted from the pen 1000 cannot be detected until the period TB has elapsed even after the period T2 has started.

Therefore, the driver circuit 500 according to the present embodiment is provided with the energy dissipation circuit 540 so that the electromagnetic energy remaining in the reception antenna coil is transmitted to the transmission antenna at the timing when reception of the emitted radio wave by the reception antenna coil is started. The energy dissipation resistor 541 corresponding to the frequency of the transmission radio wave transmitted from the coil is consumed.

By doing so, it is possible to reduce the energy remaining in the receiving antenna coil and to quickly detect the radio wave emitted from the pen 1000.

Note that the residual energy consumption characteristics by the energy dissipation resistor 541 are also affected by the parasitic capacitance in the surrounding electric circuit where the energy dissipation resistor 541 is formed and the capacitance of the capacitor 531 selected in the frequency switching circuit 530. receive. For this reason, the resistance value of the energy dissipation resistor 541 is used to efficiently reduce the residual energy of the receiving antenna coil in consideration of not only the frequency of the transmission radio wave but also the parasitic capacitance and the like (more residual energy in a shorter time). It is set so that it can be dissipated.

By providing such an energy dissipation circuit 540, the electronic apparatus 600 according to the present embodiment, as shown in FIG. 7, at a timing when a period TA shorter than the above-described period TB has elapsed after the period T2 has started. The radio wave emitted from the pen 1000 can be detected.

For this reason, even if the moving speed of the pen 1000 on the panel 610 becomes higher, the position of the pen 1000 can be accurately specified.

Also, the radio wave emitted from the pen 1000 has a characteristic of decaying with time as described above. For this reason, by detecting the emitted radio wave from the pen 1000 at an early stage, it is possible to detect the emitted radio wave with a larger signal level, so that the detection capability of the emitted radio wave can be improved. Even when the electronic device 600 is further away, the position of the pen 1000 can be detected.

Thus, even with the electronic device 600 having a larger screen, it is possible to input information using the pen 1000 incorporating a resonance / resonance circuit for radio waves or electromagnetic waves.

11 and 12 show more specific circuit examples of the energy dissipation circuit 540 of the driver circuit 500. FIG.

FIG. 11 is a circuit example when the energy dissipation switch 542 is configured using a FET (Field Effect Transistor), and FIG. 12 is a circuit example when the energy dissipation switch 542 is configured using a bipolar transistor.

In the case of using an FET, as shown in FIG. 11, the energy dissipation switch 542 may be configured to connect the drains of an n-channel FET and a p-channel FET. In this case, when the energy dissipation signal is at the H (High) level, the energy dissipation switch 542 is turned on, and the energy stored in the antenna coil 710 is dissipated by the energy dissipation resistor 541. When the energy dissipation signal is at L (Low) level, the energy dissipation switch 542 is turned off.

On the other hand, when using a bipolar transistor, as shown in FIG. 12, it is preferable to configure the energy dissipation switch 542 so that the collectors of the npn transistor and the pnp transistor are connected to each other. Also in this case, when the energy dissipation signal is at the H (High) level, the energy dissipation switch 542 is turned on, the stored energy stored in the antenna coil 710 is dissipated by the energy dissipation resistor 541, and the energy dissipation signal is At the L (Low) level, the energy dissipation switch 542 is turned off.

When the energy dissipation switch 542 is configured using an FET, the switching can be performed at a higher speed and the power consumption can be reduced compared to the case where a bipolar transistor is used.

On the other hand, when the energy dissipation switch 542 is configured using a bipolar transistor, the stored energy of the antenna coil 710 can be dissipated in a shorter time because the power consumption per unit time is larger than when an FET is used. it can. For this reason, when the stored energy is to be dissipated in a shorter time, it is more preferable to configure the energy dissipating circuit 540 using a bipolar transistor.

As shown in FIG. 7, the energy dissipation signal is off (L level) during a period in which the transmission radio wave is transmitted from the transmission antenna coil (during the period of T1, T3, and T5), and is emitted by the reception antenna coil. Antenna coil 710 that is turned on (H level) for a predetermined time at the timing of starting reception of (T2, T4, T6) but does not function as a transmitting antenna coil (for example, antenna coils 710B, 710C, 710D, 710E) ) Stored energy is dissipated even during a period in which a transmission radio wave is transmitted from the transmission antenna coil (antenna coil 710A) (during the period T1, T3, T5). It is good to keep. According to such an aspect, since the energy stored in the receiving antenna coil can be dissipated before the receiving antenna coil starts receiving the emitted radio wave from the pen 1000, reception of the emitted radio wave by the receiving antenna coil is started. At this timing, it is possible to immediately detect the radio wave emitted from the pen 1000.
== Second Embodiment ==
In the above embodiment, as shown in FIG. 2 and FIG. 9, the case where the transmission antenna coil is configured by a loop antenna has been described, but a configuration without using a loop antenna as shown in FIG. 13 is also possible.

That is, the electronic device 600 shown in FIG. 13 directs the four antenna coils 710B, 710C, 710D, and 710E formed of air core coils in a direction intersecting the panel portion 610 with the winding axis of these air core coils. Thus, it is configured so as to be provided at corners around the panel portion 610.

Also, these antenna coils 710 function as both transmitting antenna coils and receiving antenna coils.

Then, as shown in FIG. 5, the electronic device control unit 900 transmits the transmission radio wave by the transmission antenna coil (period shown by T1 and T3) and receives the emission radio wave by the plurality of reception antenna coils (shown by T2 and T4). When the transmission radio wave is transmitted, a different antenna coil 710 is selected as the transmission antenna coil.

That is, for example, the electronic device control unit 900 selects the antenna coil 710B as the transmission antenna coil in the period T1 shown in FIG. 5 and functions as the four antenna coils 710B, 710C, 710D, and 710E in the period T2. In the next period T3, for example, the antenna coil 710C different from the antenna coil 710B is selected as a transmission antenna coil, and the four antenna coils 710B, 710C, 710D, and 710E are caused to function as reception antenna coils in the period T4.

The reception intensity detector 871 detects the reception intensity of the emitted radio wave emitted from the pen 1000 received by each of the plurality of reception antenna coils.

The position specifying unit 872 specifies the position of the pen 1000 in the panel unit 610 based on the reception intensity of each of the emitted radio waves received by each receiving antenna coil.

For example, assume that the tip of the pen 1000 touches the position P (coordinates (i, j)) of the panel 610 shown in FIG. Then, the emitted radio waves emitted from the pen 1000 are received by a plurality of receiving antenna coils (antenna coils 710B, 710C, 710D, and 710E) provided at the corners of the panel unit 610, respectively.

The received intensity of the emitted radio wave decreases as the position of P moves away from the receiving antenna coil, and in principle decreases in inverse proportion to the square of the distance between the position of P and each receiving antenna coil.

Therefore, the position specifying unit 872 uses the received intensity of the emitted radio waves received by the four antenna coils 710B, 710C, 710D, and 710E to calculate the value of the coordinates (i, j) of the position P on the panel unit 610. Ask. Specifically, the position specifying unit 872 calculates the relative ratios of the received intensities of the radio waves received by the four antenna coils 710B, 710C, 710D, and 710E, and displays “ The position coordinates (i, j) of P are specified by searching for the row having the value closest to the relative ratio of the received intensity with reference to the columns “B”, “C”, “D”, and “E”.

In the “B” column, “C” column, “D” column, and “E” column of the position specifying table 890B, the antenna coils 710B, 710C, 710D, and 710E measured by a prior experiment or the like receive. The relative ratio of the received radio wave intensity is recorded for each position coordinate (i, j) on the panel unit 610 of the pen 1000.

As described above, the position specifying unit 872 specifies the position of the pen 1000 in the panel unit 610 based on the reception intensity of the emitted radio wave detected by the reception intensity detection unit 871.

The position specifying unit 872 specifies the position of the pen 1000 (P point in FIG. 13) and notifies the electronic device control unit 900 of the position.

And the electronic device control part 900 performs the process for making a point draw in the position of the P point of FIG. 13 with respect to the LCD part 620, for example.

When different frequencies are defined for each type of pen 1000 such as color and thickness, the electronic device 600 specifies not only the position of the pen 1000 but also the type of the pen 1000 as described above. To.

Note that although the case where the four antenna coils 710 are arranged at the corners of the panel unit 610 is illustrated in the electronic device 600 illustrated in FIG. 13, the electronic device 600 includes four antenna devices 600 similar to the electronic device 600 illustrated in FIG. 9. The structure provided with the two or more antenna coils 710 may be sufficient. With such an aspect, the position of the pen 1000 can be specified more accurately.
== Third Embodiment ==
Next, the detection apparatus 2000 which is one form of the detection system which concerns on embodiment of this invention is demonstrated.

The detection device 2000 according to the present embodiment is a device that detects a detection object 2100 embedded in the ground as shown in FIG. Then, the detection device 2000 determines the current position based on the GPS signal transmitted from the GPS (Global Positioning System) satellite 3000, thereby specifying the detected position of the detected object 2100.

In this case, the detection apparatus 2000 according to the present embodiment can measure the fluctuation of the ground by, for example, repeatedly measuring the position of the detected object 2100 every predetermined period.

The configuration of the detection device 2000 is shown in FIG. Further, FIG. 16 shows the configuration of the detection object 2100.

As illustrated in FIG. 15, the detection device 2000 includes a transmission / reception control unit 2820, a detection device control unit 2900, and a plurality of antenna coils 710. Among these, the transmission / reception control unit 2820 and the detection device control unit 2900 also function as an antenna control unit that controls the antenna coil 710.

Further, as shown in FIG. 16, the detected object 2100 is configured by mounting a resonator 2200 configured to tune to a radio wave having a frequency f. The detection device 2000 detects the detected object 2100 by detecting the resonator 2200 attached to the detected object 2100.

First, the resonator 2200 according to the present embodiment will be described with reference to FIG.

The resonator 2200 is formed so as to be tuned to the radio wave having the frequency f, and efficiently absorbs the energy of the radio wave having the frequency f. In this manner, the resonator 2200 accumulates energy by contactless power feeding (also referred to as wireless power feeding). The resonator 2200 includes a rod-shaped ferrite 2210, a coil 2211 wound around the ferrite 2210, and a capacitor 2212 that is electrically connected to the coil 2211 and forms an LC circuit together with the coil 2211. Is done.

It should be noted that the inductance of the coil 2211 and the capacitance of the capacitor 2212 included in the resonator 2200 are set so that the Q value of the LC circuit increases (becomes a predetermined value or more). For this reason, the resonator 2200 temporarily stores the received radio wave energy at the frequency f in an LC circuit including the coil 2211 and the capacitor 2212, and the stored radio wave energy (accumulated energy) at the frequency f. Transmit as emitted radio waves. That is, in the LC circuit of the resonator 2200, radio wave energy is accumulated and released with a delay, and the radio wave energy (accumulated energy) released with a delay is regarded as transmission of a radio wave of frequency f.

Further, the resonator 2200 according to the present embodiment has a plurality of types. The type of the resonator 2200 is determined according to the type of the detected object 2100.

The frequency f with which the resonator 2200 is tuned is determined so as to differ depending on the type of the detection object 2100. For example, as defined in the frequency table 2891 shown in FIG. 17, in the case of the type A object 2100, for example, the inductance of the coil 2211 and the capacitor 2212 in the resonator 2200 are tuned to a frequency of 140 kHz (kilohertz). Capacity is set.

Therefore, for example, when the type A detected object 2100 receives a radio wave having a frequency of 140 kHz, a larger stored energy is stored in the LC circuit than when a radio wave other than 140 kHz is received. Transmits emitted radio waves.

The detection device 2000 can identify the type of the detected object 2100 by capturing the change in the reception intensity of the emitted radio wave.

Next, returning to FIG. 15, the configuration of the detection device 2000 will be described. As described above, the detection device 2000 includes the transmission / reception control unit 2820, the detection device control unit 2900, and the plurality of antenna coils 710.

The detection device control unit 2900 controls the detection device 2000 together with various electronic circuits and batteries provided in the detection device 2000, and realizes various functions as the detection device 2000.

The antenna coil 710 includes an air-core coil, and includes an antenna coil 710F that functions as a transmission antenna coil, and an antenna coil 710G that is configured by winding a coil around ferrite and functions as a reception antenna coil. Including.

The antenna coil 710F is an antenna that transmits radio waves (transmitted radio waves) having a predetermined frequency f. This transmitted radio wave is received most efficiently by the resonator 2200 tuned to the frequency f. The resonator 2200 transmits the stored transmission radio wave energy (accumulated energy) as an emission radio wave of frequency f.

On the other hand, the antenna coil 710G is an antenna that receives the emitted radio wave emitted from the resonator 2200.

The antenna coils 710F and 710G are connected to a driver circuit 500 included in the transmission / reception control unit 2820, respectively.

Then, when the detection device control unit 2900 controls the driver circuit 500, transmission of the transmission radio wave by the antenna coil 710F and reception of the emission radio wave by the antenna coil 710G are controlled.

Note that the driver circuit 500 is individually provided in the antenna coils 710F and 710G.

Further, as shown in FIG. 5, the detection device control unit 2900 transmits transmission radio waves (periods indicated by T1 and T3) by a transmission antenna coil (antenna coil 710F in this embodiment) and a reception antenna coil (this embodiment). Then, the transmission antenna coil and the reception antenna coil are set so that reception of the radio wave emitted from the resonator 2200 by the antenna coil 710G (periods indicated by T2 and T4) is alternately repeated every predetermined time. Control. The emitted radio wave emitted from the resonator 2200 is indicated by the symbol S in FIG.

In this manner, the transmission antenna coil does not transmit the transmission radio wave during the period in which the reception antenna coil receives the emission radio wave from the resonator 2200. Therefore, the reception antenna coil transmits the radio wave emission from the resonator 2200. It becomes possible to receive efficiently and to improve the detection capability of the to-be-detected body 2100.

Returning to FIG. 15, the transmission / reception control unit 2820 includes an oscillation circuit 730, a driver circuit 500, a filter circuit 840, a detection circuit 850, AD conversion circuits 860 and 861, a signal analysis unit (detection unit) 870, A frequency table 2891 and a GPS control unit 2880 are included.

In FIG. 15, for simplification of description, the driver circuit 500, the filter circuit 840, the detection circuit 850, and the AD conversion circuit 860 are shown one by one. However, for each antenna coil 710F and 710G, respectively. Is provided.

The oscillation circuit 730 is a circuit that generates an AC voltage so that a transmission radio wave having a frequency f is transmitted from the transmission antenna coil. The frequency of the AC voltage generated by the oscillation circuit 730 is controlled by the detection device control unit 2900.

Specifically, the detection device control unit 2900 performs transmission of transmission radio waves by the transmission antenna coil and reception of emission radio waves from the resonator 2200 by reception antenna coils alternately each time transmission radio waves are transmitted. The frequency of the AC voltage generated by the oscillation circuit 730 is changed so that the signals are transmitted at different frequencies.

More specifically, the detection device control unit 2900 controls the oscillation circuit 730 so that the transmission radio wave is sequentially transmitted at each frequency set corresponding to the type of the resonator 2200. Then, after completing the transmission of the transmission radio wave at each frequency corresponding to the type of the resonator 2200, the detection device control unit 2900 repeats again to transmit the transmission radio wave at each frequency.

The AC voltage generated by the oscillation circuit 730 is input to the driver circuit 500 as a transmission signal and amplified. A transmission radio wave is transmitted from the transmission antenna coil.

The radio wave emitted from the resonator 2200 is received by the antenna coil 710G, amplified, denoised, and demodulated by the driver circuit 500, filter circuit 840, and detection circuit 850 connected to the antenna coil 710G, respectively, and then converted by the AD conversion circuit 860. After being converted to a digital signal, it is input to the signal analysis unit 2870.

The signal analyzing unit 2870 detects the resonator 2200 by detecting the emitted radio wave received by the receiving antenna coil. The signal analysis unit 2870 includes a reception intensity detection unit 871 and a determination unit 2872.

The reception intensity detector 871 detects the reception intensity of the radio wave emitted from the resonator 2200 received by the reception antenna coil (antenna coil 710G). The reception intensity detection unit 871 detects the frequency f of the transmission radio wave transmitted from the antenna coil 710F based on the signal from the oscillation circuit 730 input via the AD conversion circuit 861.

In this way, the radio wave emitted from the resonator 2200 received by the antenna coil 710G is taken into the transmission / reception control unit 2820.

The discriminating unit 2872 detects the resonator 2200 and identifies the type of the resonator 2200 based on the reception intensity of the emitted radio wave received by the receiving antenna coil (antenna coil 710G). When the determination unit 2872 detects the resonator 2200, it notifies the GPS control unit 2880.

The GPS control unit 2880 acquires a GPS signal from the GPS satellite 3000 and specifies the current position (for example, latitude and longitude) of the detection device 2000.

The detection device control unit 2900 acquires information indicating the type of the resonator 2200 from the determination unit 2872, and acquires information indicating the current position from the GPS control unit 2880, so that the type and current position of the detected object 2100 are obtained. And the information is output to a display device (not shown) such as a liquid crystal monitor.

Note that the detection device 2000 may not include the GPS control unit 2880. In this case, the detection device control unit 2900 outputs information indicating the type of the resonator 2200 (or the detected object 2100) detected by the determination unit 2872 to a display device (not shown). And the positional information on the to-be-detected body 2100 should just be acquired using a separate GPS receiver.

Thus, according to the detection apparatus 2000 according to the present embodiment, the position of the detected object 2100 can be specified. In addition, it is possible to measure the ground fluctuation by burying the detection object 2100 in the basement and repeatedly measuring the position of the detection object 2100 every predetermined period.

In this case, there is no need to place a mark on the ground where the object to be detected 2100 is embedded, so there is no need to worry about the disappearance of the mark. For example, a mark such as a riverbed, a seabed, a lakebed, etc. It is also possible to facilitate the investigation of underground ground changes in places where it is not easy to install.

Alternatively, according to the detection apparatus 2000 according to the present embodiment, for example, it is possible to attach the resonator 2200 to an oil feed pipe of an oil pipeline and embed the oil feed pipe underground. In this case, by using the detection device 2000 according to the present embodiment, the position of the oil feeding pipe can be easily specified from the ground, and the position of the oil feeding pipe can be easily determined when digging up the vicinity of the oil feeding pipe. It is also possible to specify as follows. According to such an aspect, it becomes possible to embed the oil pipeline of the oil pipeline underground, and it is possible to improve the safety of the oil pipeline. In addition, it becomes easy to perform excavation work while avoiding the oil feed pipe, and the safety of surrounding work can be improved.

Or according to the detection apparatus 2000 which concerns on this embodiment, the resonator 2200 which resonates to a different frequency according to the kind of motor vehicle is each mounted | worn with the car mass-produced every day, for example, ferry etc. from a factory. It is also possible to quickly specify the type of automobile on the ship or at the wharf when transporting by means of transportation.

In addition, although the detection apparatus 2000 mentioned above was the structure provided with one receiving antenna coil, it is also possible to set it as the structure provided with a some receiving antenna coil. According to such an aspect, it becomes possible to more reliably detect the radio wave emitted from the resonator 2200, and it is possible to further improve the ability to detect radio waves and electromagnetic waves by the receiving antenna coil.

Further, by making the determination unit 2872 function also as the position specifying unit 872, as described in the first embodiment and the second embodiment, based on the reception intensity of the emitted radio waves respectively received by the plurality of reception antenna coils, The position of the resonator 2200 can be specified without using a GPS signal.

The detection system according to the present embodiment has been described by taking the detection device 2000 and the electronic device 600 as examples. However, according to the detection system, the reception antenna coil is received at the timing when reception of the emitted radio wave by the reception antenna coil is started. Therefore, the influence of the reception antenna coil from the transmission antenna coil due to the interaction between the transmission antenna coil and the reception antenna coil is reduced, and the emission from the resonator 2200 and the pen 1000 is reduced. It becomes possible to detect the radio wave at a timing with a larger amplitude. For this reason, it is possible to further improve the ability to detect radio waves and electromagnetic waves by the receiving antenna coil. For example, even in a large screen electronic device 600, information input by a pen 1000 incorporating a radio wave or electromagnetic wave resonance / resonance circuit is possible. It becomes possible to do.

In addition, the detection system according to the present embodiment includes a plurality of reception antenna coils, and based on the reception intensity detection unit 871 that detects the reception intensity of each of the radio waves received by the plurality of reception antenna coils, and the reception intensity. By including a position specifying unit 872 (or determination unit 2872) for specifying the position of the resonator 2200 and the pen 1000, the position of the detected object 2100 to which the resonator 2200 is attached and the position of the pen 1000 can be determined. It is also possible to specify.

In addition, the detection system according to the present embodiment transmits the transmission antenna coil so that transmission of the transmission radio wave by the transmission antenna coil and reception of the emission radio wave from the resonator 2200 and the pen 1000 by the reception antenna coil are alternately repeated. And control the receiving antenna coil. In this manner, the receiving antenna coil can be prevented from transmitting the transmission radio wave from the transmission antenna coil while receiving the radio wave emitted from the resonator 2200 or the pen 1000. It is possible to efficiently receive radio waves emitted from 1000, and it is possible to improve the detection capability of the resonator 2200 and the pen 1000.

In addition, the electronic apparatus 600 according to the present embodiment includes a transmission antenna coil and a plurality of reception antenna coils around the panel unit 610, and an emission radio wave emitted from the pen 1000 that has received the transmission radio wave transmitted from the transmission antenna coil. Are received by the plurality of receiving antenna coils, and the position of the pen 1000 is specified based on the reception intensity of each of the radio waves received by the plurality of receiving antenna coils. According to such an aspect, it is possible to input information with the pen 1000 incorporating a radio wave or electromagnetic wave resonance / resonance circuit without lowering the transparency of the panel unit 610 of the electronic device 600.

In addition, the electronic device 600 according to the present embodiment alternately transmits transmission radio waves by the transmission antenna coil and receives emission radio waves from the pen 1000 by the reception antenna coil every time the transmission radio waves are transmitted. The transmission radio wave is transmitted at any one of the frequencies determined according to the type of the pen 1000 so that the frequency is different every time, and the position specifying unit 872 receives the radio wave emitted by the reception antenna coil. The type of the pen 1000 is specified based on the reception intensity of the radio wave emitted from the pen 1000 that changes each time. By such an aspect, the electronic apparatus 600 according to the present embodiment provides a user interface capable of inputting and displaying information using various types of pens 1000 having different colors, thicknesses, patterns, and the like. Is possible.

Accordingly, for example, by configuring the electronic blackboard system with the electronic device 600 and the pen 1000 according to the present embodiment, an electronic blackboard system that is similar to a whiteboard that uses a commonly used ink-type color pen can be obtained. It can also be realized.

In addition, the electronic apparatus 600 according to the present embodiment is configured to include a plurality of energy dissipation resistors 541 having impedances corresponding to a plurality of frequencies determined for each type of the pen 1000, and to receive an emitted radio wave by the receiving antenna coil. At the timing when the transmission is started, the electromagnetic energy remaining in the reception antenna coil is dissipated using the energy dissipation resistor 541 corresponding to the frequency of the transmission radio wave transmitted from the transmission antenna coil most recently.

In this manner, the energy remaining in the receiving antenna coil can be reduced, and the radio wave emitted from the pen 1000 can be detected quickly. For this reason, the position of the pen 1000 can be specified more accurately.

Further, since the radio wave emitted from the pen 1000 has a characteristic of decaying with time, even if the pen 1000 is further away from the receiving antenna coil by detecting the radio wave emitted from the pen 1000 earlier, The device 600 can detect the position of the pen 1000. Accordingly, even with the electronic device 600 having a larger screen, it is possible to input information using the pen 1000 incorporating a resonance / resonance circuit for radio waves or electromagnetic waves.

In addition, the electronic apparatus 600 according to the present embodiment can be configured such that the transmission antenna coil and the reception antenna coil are configured by a plurality of antenna coils 710 each having a coil. By such an aspect, it is possible to reduce the types of components used for the transmission antenna coil and the reception antenna coil, and to reduce the cost of the electronic device 600.

In this case, the electronic device 600 includes an antenna coil 710 that functions as a transmission antenna coil when alternately transmitting transmission radio waves by the transmission antenna coil and receiving radio waves emitted from the pen 1000 by the reception antenna coil. It is good to control to change every time. According to such an aspect, it becomes possible to reduce the influence of the difference in position of each transmission antenna coil provided around the panel unit 610 on the difference in reception intensity, and the position of the pen 1000 can be specified with higher accuracy. It becomes possible to do.

In addition, in the electronic device 600 according to the present embodiment, the receiving antenna coil can be provided at least at the corners of the panel unit 610 formed in a polygonal shape. By such an aspect, it becomes possible to make the position specifying accuracy of the pen 1000 more accurate.

Further, as described above, in the electronic apparatus 600 according to the present embodiment, since the transparency of the panel unit 610 can be prevented from being lowered, the panel unit 610 is placed outside the LCD unit 620 (LCD unit) as shown in FIG. 620 can be attached to the surface on the side opposite to the surface facing the main body component 630.

Therefore, a general LCD panel that does not assume a pen input function can be used as the LCD unit 620 without remodeling, and costs can be reduced. More specifically, it is possible to use the LCD unit 620 as it is without removing the metal plate (aluminum plate) provided on the lower surface side of the LCD panel in order to prevent unnecessary radiation of radio waves.

The above-described embodiment is for facilitating understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

500 Driver Circuit 510 Transmission Amplifier 520 Reception Amplifier 521 Capacitor 530 Frequency Switching Circuit 531 Capacitor 532 Changeover Switch 540 Energy Dissipation Circuit 541 Energy Dissipation Resistor 542 Energy Dissipation Switch 550 Damping Resistor 600 Electronic Device 610 Panel Unit 620 LCD Unit 630 Main Body Configuration Unit 710 Antenna Coil 730 Oscillation circuit 820 Transmission / reception control unit 840 Filter circuit 850 Detection circuit 860 AD conversion circuit 861 AD conversion circuit 870 Signal analysis unit 871 Reception intensity detection unit 872 Location specification unit 890 Location specification table 891 Frequency table 900 Electronic device control unit 1000 Pen 1100 Resonance resonance circuit 1110 Ferrite 1121 Coil 1122 Capacitor 1200 Pen body 2000 Detector 2 00 detection object 2200 resonator 2210 Ferrite 2211 coil 2212 capacitor 2820 reception control unit 2870 signal analyzer 2872 determination unit 2880 GPS controller 2891 frequency table 2900 detector control unit 3000 GPS satellites

Claims (10)

1. A detection device that detects a resonator that resonates with a radio wave of a predetermined frequency,
   A transmission antenna coil for transmitting a transmission radio wave of the predetermined frequency;
   A receiving antenna coil that receives an emitted radio wave emitted from the resonator by energy of the transmission radio wave accumulated in the resonator that resonates with the transmission radio wave;
   A detector that detects the resonator by detecting the emitted radio wave received by the receiving antenna coil;
   In order to reduce the influence of the reception antenna coil from the transmission antenna coil due to the interaction between the transmission antenna coil and the reception antenna coil, at the timing when the reception antenna coil starts to receive the emitted radio wave, the reception antenna An energy dissipation circuit that dissipates the electromagnetic energy stored in the coil;
   A detection device comprising:
2. The detection device according to claim 1,
   A plurality of the receiving antenna coils;
   The detection unit includes a reception intensity detection unit that detects a reception intensity of each of the emitted radio waves received by the plurality of reception antenna coils, and a position specification unit that specifies a position of the resonator based on the reception intensity. And a detection device characterized by comprising:
3. The detection device according to claim 2,
   An antenna that controls the transmission antenna coil and the plurality of reception antenna coils so that transmission of the transmission radio wave by the transmission antenna coil and reception of the emission radio wave by the plurality of reception antenna coils are alternately repeated. A control unit;
   A detection device comprising:
4. An electronic device capable of inputting information by the resonator,
   A detection device according to claim 3;
   A panel unit for receiving input of information by the resonator;
   With
   The transmitting antenna coil and the plurality of receiving antenna coils are arranged around the panel unit,
   The reception intensity detection unit detects the reception intensity of each of the emitted radio waves received by the plurality of reception antenna coils when the resonator approaches the panel unit,
   The electronic device according to claim 1, wherein the position specifying unit specifies the position of the resonator in the panel unit based on the reception intensity of each of the emitted radio waves detected by the reception intensity detection unit.
5. The electronic device according to claim 4,
   The resonator includes a hollow cylindrical pen body, a rod-shaped ferrite housed in the pen body, a coil wound around the ferrite, and a capacitor electrically connected to the coil. The inductance of the coil and the capacitance of the capacitor included in the resonator resonate at a frequency corresponding to the type of the resonator among a plurality of frequencies determined for each type of the resonator. Is set to
   The antenna control unit, when alternately transmitting the transmission radio wave by the transmission antenna coil and receiving the emission radio wave by the plurality of reception antenna coils, changes the frequency each time the transmission radio wave is transmitted. To transmit the transmission radio wave,
   The position specifying unit specifies the type of the resonator based on reception intensity of the emitted radio wave from the resonator that changes every time the receiving antenna coil receives the emitted radio wave. machine.
6. The electronic device according to claim 5,
   The energy dissipation circuit includes a plurality of impedance elements each having an impedance corresponding to a plurality of frequencies determined for each type of the resonator, and reception of the emitted radio wave by the reception antenna coil is started. An electronic device characterized in that, at the timing, the electromagnetic energy accumulated in the receiving antenna coil is dissipated using the impedance element corresponding to the frequency of the transmitting radio wave that has been transmitted from the transmitting antenna coil most recently. .
7. The electronic device according to claim 5 or 6,
   The type of the resonator is determined by a color of a line when the electronic device displays a locus on the panel unit of the resonator on a display.
8. The electronic device according to claim 5 or 6,
   The type of the resonator is determined by a thickness of a line when the electronic device displays a locus on the panel unit of the resonator on a display.
9. The electronic device according to any one of claims 4 to 8,
   The transmitting antenna coil and the plurality of receiving antenna coils are each configured by an antenna coil configured to have a coil,
   The antenna control unit is different each time the transmission radio wave is transmitted when the transmission radio wave transmission by the transmission antenna coil and the emission radio wave reception by the plurality of reception antenna coils are alternately performed. An electronic device characterized in that a coil functions as the transmitting antenna coil.
10. The electronic device according to any one of claims 4 to 9,
    The surface of the panel part is polygonal,
    The electronic device, wherein the receiving antenna coil is provided at least at a corner portion of the surface of the panel portion.

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