WO2016024335A1 - Système de détection et dispositif électronique - Google Patents

Système de détection et dispositif électronique Download PDF

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Publication number
WO2016024335A1
WO2016024335A1 PCT/JP2014/071324 JP2014071324W WO2016024335A1 WO 2016024335 A1 WO2016024335 A1 WO 2016024335A1 JP 2014071324 W JP2014071324 W JP 2014071324W WO 2016024335 A1 WO2016024335 A1 WO 2016024335A1
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WO
WIPO (PCT)
Prior art keywords
antenna line
antenna
fixed
radio wave
pen
Prior art date
Application number
PCT/JP2014/071324
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English (en)
Japanese (ja)
Inventor
昭 池谷
Original Assignee
昭 池谷
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 昭 池谷 filed Critical 昭 池谷
Priority to PCT/JP2014/071324 priority Critical patent/WO2016024335A1/fr
Publication of WO2016024335A1 publication Critical patent/WO2016024335A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means

Definitions

  • the present invention relates to a detection system and an electronic device.
  • a transmission terminal that transmits radio waves is attached to the object to be detected, and the effects of multipath are reduced based on the received signal strength (RSSI: Received Signal Strength Strength Indication) received by multiple receiving terminals.
  • RSSI Received Signal Strength Strength Indication
  • There is a technique for calculating the position of a terminal see, for example, Patent Document 1).
  • the present invention has been made in view of the above problems, and an object thereof is to enable efficient detection of an object to be detected.
  • a detection system includes a fixed transmission antenna line that transmits radio waves, a fixed reception antenna line that receives radio waves transmitted by the fixed transmission antenna line, and propagation of radio waves transmitted from the fixed transmission antenna line.
  • a characteristic change detection unit that detects a change in the characteristic of the radio wave received by the fixed reception antenna line when a radio wave absorber approaches the path;
  • FIG. 1 is a diagram showing an overall configuration of a detection system 100 according to the first embodiment of the present invention.
  • the detection system 100 includes a transmitter 200 and a receiver 300.
  • the transmitter 200 includes a fixed transmission antenna line 210 for transmitting radio waves and a transmission control unit 220 that performs control for transmitting radio waves from the fixed transmission antenna line 210.
  • the transmission control unit 220 performs control so that a radio wave having a predetermined frequency f is transmitted from the fixed transmission antenna line 210.
  • the receiver 300 analyzes a fixed reception antenna line 310 for receiving a radio wave transmitted from the fixed transmission antenna line 210 and a radio wave received by the fixed reception antenna line 310, and transmits from the transmitter 200 to the receiver 300.
  • a reception control unit 320 that detects the radio wave absorber 500 adjacent to the radio wave propagation paths P1 and P2.
  • the fixed transmission antenna line 210 and the fixed reception antenna line 310 a loop antenna, a dipole antenna, a helical antenna, or the like that is suitable for the application can be used as appropriate.
  • the fixed transmission antenna line 210 and the fixed reception antenna line 310 are simply referred to as a transmission antenna 210 and a reception antenna 310, respectively.
  • a multipath when a radio wave is transmitted from the transmission antenna 210, a multipath usually occurs.
  • the radio wave transmitted from the transmission antenna 210 passes through a plurality of propagation paths P1 and P2, and is received by the reception antenna 310. To reach.
  • the radio wave passing through the propagation path P1 is a direct wave that reaches the receiving antenna 310 directly from the transmission antenna 210 or at the shortest distance, and the radio wave passing through the propagation path P2 is various in the atmosphere ionosphere, the earth, mountains, buildings, and the like.
  • the delayed wave is reflected by the radio wave reflector K and reaches the receiving antenna 310 later than the direct wave.
  • the receiving antenna 310 receives a combined wave in which a direct wave and a delayed wave are combined.
  • the reception control unit 320 measures and records the radio wave characteristics such as the reception intensity (RSSI), phase, and frequency of the composite wave received by the reception antenna 310 at predetermined time intervals. When the reception control unit 320 detects that the characteristics of these radio waves have changed, the reception control unit 320 detects the radio wave absorber 500 adjacent to the radio wave propagation paths P1 and P2.
  • RSSI reception intensity
  • phase phase
  • frequency frequency of the composite wave received by the reception antenna 310
  • the radio wave absorber 500 when the radio wave absorber 500 is close to the propagation path P1, the direct wave transmitted from the transmission antenna 210 to the propagation path P1 is absorbed by the radio wave absorber 500, so that the reception antenna
  • the characteristic of the composite wave received by 310 changes.
  • the radio wave intensity (RSSI), frequency, or phase of the synthesized wave changes.
  • the radio wave absorber 500 when the radio wave absorber 500 is close to the propagation path P2, the radio wave (delayed wave) transmitted from the transmission antenna 210 to the propagation path P2 is absorbed by the radio wave absorber 500. Wave characteristics change.
  • the reception control unit 320 compares the characteristic change amount of the composite wave generated when the radio wave absorber 500 is close to the radio wave propagation paths P1 and P2 in this way with a predetermined threshold value, and the characteristic change amount exceeds the threshold value. When the radio wave absorber 500 is detected, it is detected that the radio wave absorber 500 has approached the radio wave propagation paths P1, P2.
  • the detection system 100 can efficiently detect the radio wave absorber 500 regardless of the presence or absence of multipath.
  • the radio wave absorber 500 when the radio wave absorber 500 is close to the propagation paths P1 and P2 in the vicinity of the transmission antenna 210, the intensity of the radio wave received by the reception antenna 310 decreases. On the other hand, when the radio wave absorber 500 is close to the propagation paths P1 and P2 in the vicinity of the receiving antenna 310, the intensity of the radio wave received by the receiving antenna 310 is improved.
  • the detection system 100 can also specify the position of the radio wave absorber 500 by using such properties of the radio wave absorber 500.
  • the radio wave absorber 500 detected by the detection system 100 is an object having a property of absorbing radio waves, such as ferrite, metal, and a coil.
  • the vehicle may be a vehicle equipped with the radio wave absorber 500, a vehicle such as an automobile or a ship, various industrial products such as electric products and foods, or a person or an animal.
  • the transmission control unit 220 includes an oscillation circuit 230, a driver circuit 240, and an antenna adjustment unit 250.
  • the oscillation circuit 230 is a circuit that generates an AC voltage having a predetermined frequency f.
  • the driver circuit 240 converts the AC voltage supplied from the oscillation circuit 230 into an AC current.
  • the antenna adjustment unit 250 performs adjustment for efficiently transmitting radio waves from the transmission antenna 210.
  • the antenna adjustment unit 250 includes an extension coil 251 and a capacitor 252.
  • the extension coil 251 is a coil that matches the frequency f of the radio wave transmitted from the transmission antenna 210 with the length of the transmission antenna 210 and efficiently transmits the radio wave.
  • the capacitor 252 acts to cut an electromagnetic wave component having a predetermined frequency. By inserting the capacitor 252, it is possible to remove frequency components of electromagnetic waves that are harmful to the human body, for example.
  • the reception control unit 320 includes a signal amplification circuit 330, a filter circuit 340, a detection circuit 350, an AD conversion circuit 360, and a signal analysis unit 370.
  • the radio wave received by the receiving antenna 310 is amplified, noise-removed, and demodulated by the signal amplification circuit 330, the filter circuit 340, and the detection circuit 350, respectively, and converted into a digital signal by the AD conversion circuit 360.
  • the signal analysis unit 370 includes a characteristic change detection unit 371 and an object detection unit (radio wave absorber detection unit) 372.
  • the characteristic change detection unit 371 detects a change in the characteristic of the radio wave received by the receiving antenna 310.
  • the characteristic change detection unit 371 measures radio wave characteristics such as reception intensity (RSSI), phase, and frequency of radio waves received by the receiving antenna 310 at predetermined time intervals and records them in a memory (not shown). The characteristic change detection unit 371 compares the amount of change in the characteristics of these radio waves with a predetermined threshold, and detects that the characteristic of the radio wave received by the receiving antenna 310 has changed when the amount of change exceeds the threshold. To do.
  • RSSI reception intensity
  • phase phase
  • frequency of radio waves received by the receiving antenna 310 at predetermined time intervals and records them in a memory (not shown).
  • the characteristic change detection unit 371 compares the amount of change in the characteristics of these radio waves with a predetermined threshold, and detects that the characteristic of the radio wave received by the receiving antenna 310 has changed when the amount of change exceeds the threshold. To do.
  • the object detection unit 372 detects that the radio wave absorber 500 has approached the radio wave propagation paths P1 and P2 when the characteristic change detection unit 371 detects that the radio wave characteristic has changed.
  • the object detection unit 372 outputs information notifying the proximity of the radio wave absorber 500 to a display device (not shown) connected to the reception control unit 320, or sounds an output device (not shown) such as a voice or a buzzer. Or Alternatively, the object detection unit 372 transmits information notifying that the radio wave absorber 500 has approached to another computer that is communicably connected to the reception control unit 320 via the Internet, a LAN (Local Area Network), or the like. .
  • the detection system 100 can efficiently detect the radio wave absorber 500 regardless of the presence or absence of multipath.
  • the antenna adjustment unit 250 is provided in the transmission control unit 220. Therefore, when the radio wave absorber 500 is close to the propagation paths P1 and P2 in the vicinity of the transmission antenna 210, the intensity of the radio wave received by the reception antenna 310 is reduced. On the other hand, when the radio wave absorber 500 is close to the propagation paths P1 and P2 in the vicinity of the receiving antenna 310, the intensity of the radio wave received by the receiving antenna 310 is improved.
  • the detection system 100 may be configured such that the antenna adjustment unit 250 is provided in the reception control unit 320 as illustrated in FIG. 2B.
  • the radio wave absorber 500 when the radio wave absorber 500 is close to the propagation paths P1 and P2 in the vicinity of the transmission antenna 210, the intensity of the radio wave received by the reception antenna 310 is improved.
  • the radio wave absorber 500 when the radio wave absorber 500 is close to the propagation paths P1 and P2 in the vicinity of the receiving antenna 310, the intensity of the radio wave received by the receiving antenna 310 decreases.
  • the detection system 100 can also specify the position of the radio wave absorber 500 by using such properties of the radio wave absorber 500.
  • the frequency f of the radio wave used by the detection system 100 is preferably 1 megahertz or less, for example, about 500 kilohertz. According to such an aspect, it is possible to reduce the cost due to the availability of components used when manufacturing the transmitter 200 and the receiver 300, and to maintain the detection accuracy of the radio wave absorber 500.
  • FIG. 3 is a diagram illustrating an overall configuration of the electronic apparatus 600 according to the present embodiment.
  • the electronic device 600 according to the present embodiment is an information device such as a tablet terminal, a mobile phone, a smartphone, or a personal computer as an example.
  • the electronic apparatus 600 includes a main body device 640 and a pen 1000.
  • the pen 1000 is a device used for a user to perform various input operations to the main device 640.
  • the main device 640 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, batteries, and the like for controlling the main body device 640.
  • the main device 640 is controlled by an electronic device control unit 900 (described later) built in the main body configuration unit 630, and realizes various functions as the main device 640.
  • the LCD unit 620 is a planar display device mounted on the main body configuration unit 630, and displays various information such as characters, graphics, images, and moving images under the control of the electronic device control unit 900.
  • the panel unit 610 is a planar and transparent member that is mounted on the surface of the LCD unit 620 opposite to the surface facing the main body constituting unit 630, and accepts an input operation by the user using the pen 1000.
  • FIGS. 4 to 5 are diagrams showing a configuration provided for the main device 640 according to the present embodiment to accept an input operation by the pen 1000.
  • the pen 1000 is a device used to input various types of information to the main body device 640.
  • the pen 1000 includes a hollow cylindrical pen main body 1200 having an open end and a radio wave absorber 1100 accommodated in the pen main body 1200. Configured.
  • the radio wave absorber 1100 is formed so as to be tuned to the radio wave of the frequency f and efficiently absorbs the radio wave of the frequency f.
  • the radio wave absorber 1100 is electrically connected to the rod-shaped ferrite 1110 provided so that one end protrudes from the opening of the tip of the pen body 1200 as a pen tip, the coil 1121 wound around the ferrite 1110, and the coil 1121. And a capacitor 1122 connected to.
  • the pen 1000 according to the present embodiment efficiently absorbs radio waves having the frequency f and changes the characteristics of the radio waves. Since the radio wave absorber 1100 converts the energy of the absorbed radio waves into heat, transmission of the absorbed radio waves is suppressed.
  • the main device 640 includes a panel unit 610, an LCD unit 620 (not shown in FIG. 4), a transmission control unit 720, a reception control unit 820, an electronic device control unit 900, a plurality of transmission antenna switches 910, A plurality of reception antenna switches 920, a fixed transmission antenna line 710, and a fixed reception antenna line 810 are configured.
  • the transmission control unit 720, the reception control unit 820, the electronic device control unit 900, the plurality of transmission antenna switches 910, and the plurality of reception antenna switches 920 are accommodated in the main body configuration unit 630. .
  • the fixed transmission antenna line 710 and the fixed reception antenna line 810 are antennas formed by, for example, extremely fine wires.
  • the wire layer composed of the fixed transmission antenna line 710 and the fixed reception antenna line 810 is sandwiched from both sides by the panel unit 610 having a transparent glass layer or resin layer.
  • the fixed transmission antenna line 710 and the fixed reception antenna line 810 in the present embodiment are formed of, for example, a transparent resin conductor and have a back surface (LCD portion) of a panel unit 610 configured with transparent resin or glass.
  • the antenna is affixed or printed on the side facing the 620 or the surface (the side on which the pen 1000 contacts).
  • the fixed transmission antenna line 710 and the fixed reception antenna line 810 are simply referred to as a transmission antenna 710 and a reception antenna 810, respectively.
  • the transmission antenna 710 includes a plurality of antennas extending linearly, and is juxtaposed (for example, pasted) in the first direction on the panel unit 610.
  • each antenna of the transmission antenna 710 is attached to the panel unit 610 so as to be arranged in a lattice pattern.
  • the receiving antenna 810 includes a plurality of antennas extending linearly, and is juxtaposed (for example, attached) to the panel unit 610 in the second direction.
  • each antenna of the reception antenna 810 is attached to the panel unit 610 so as to be arranged in a lattice pattern.
  • the antennas of the reception antenna 810 are arranged so as to be alternately adjacent to the antennas of the transmission antenna 710.
  • the first direction is the direction in which each antenna of the transmission antenna 710 faces
  • the second direction is the direction in which each antenna of the reception antenna 810 faces.
  • the first direction and the second direction both include two directions orthogonal to each other, but the first direction and the second direction are not necessarily limited to those including two directions.
  • the first direction and the second direction may include three or more directions, or one direction.
  • first direction and the second direction are preferably the same direction as in the present embodiment, but are not necessarily limited to the same direction.
  • the transmitting antenna 710 and the receiving antenna 810 are pasted or printed on the panel unit 610
  • the front side of the panel unit 610 with which the pen 1000 contacts is more easily pasted or printed on the back surface of the panel unit 610. Since it can be made smooth, it is preferable. Also, from the viewpoint of preventing the transmission antenna 710 and the reception antenna 810 from being damaged, it is preferable that the transmission antenna 710 and the reception antenna 810 be attached or printed on the back surface of the panel portion 610.
  • the transmitting antenna 710 and the receiving antenna 810 may be pasted or printed on the surface side of the panel unit 610 (the side opposite to the side where the panel unit 610 faces the LCD unit 620).
  • a configuration in which a transparent glass plate or a resin plate is further laminated so as to cover the transmitting antenna 710 and the receiving antenna 810 can be employed.
  • each antenna of the transmission antenna 710 and each antenna of the reception antenna 810 are mounted on the panel unit 610 in a lattice pattern so as to be alternately adjacent to each other.
  • the distance between the receiving antenna 810 and the antenna is very narrow, for example, 0.5 mm to 30 mm.
  • the position of the pen 1000 can be specified with high accuracy.
  • Each antenna of the transmission antenna 710 is connected to the transmission control unit 720 via the transmission antenna switch 910.
  • the transmission antenna switch 910 is controlled to be opened and closed by a characteristic change detection unit 871 described later.
  • the characteristic change detection unit 871 can open and close each transmission antenna switch 910 individually, but normally all the transmission antenna switches 910 are closed.
  • each antenna of the reception antenna 810 is connected to the reception control unit 820 via the reception antenna switch 920.
  • the reception antenna switch 920 is also controlled to be opened and closed by the characteristic change detection unit 871.
  • the characteristic change detection unit 871 can open and close each reception antenna switch 920 individually, but normally all the reception antenna switches 920 are closed.
  • the transmission control unit 720 includes an oscillation circuit 730, a driver circuit 740, and an antenna adjustment unit 750.
  • the oscillation circuit 730 is a circuit that generates an AC voltage having a predetermined frequency f.
  • the driver circuit 740 converts the AC voltage supplied from the oscillation circuit 730 into an AC current.
  • the antenna adjustment unit 750 performs adjustment for efficiently transmitting radio waves from the transmission antenna 710.
  • the antenna adjustment unit 750 includes an extension coil 751 and a capacitor 752.
  • the extension coil 751 is a coil that matches the frequency f of the radio wave transmitted from the transmission antenna 710 with the length of the transmission antenna 710 and efficiently transmits the radio wave from the transmission antenna 710.
  • the capacitor 752 acts to cut an electromagnetic wave component having a predetermined frequency. By inserting the capacitor 752, an electromagnetic wave component harmful to the human body, for example, can be removed.
  • the characteristic change detection unit 871 closes all the transmission antenna switches 910, all the antennas included in the transmission antenna 710 (shown as a1 to a4 and b1 to b4 in FIG. 4).
  • a radio wave of frequency f is transmitted from (eight antennas).
  • the reception control unit 820 includes a signal amplification circuit 830, a filter circuit 840, a detection circuit 850, AD conversion circuits 860 and 861, and a signal analysis unit 870.
  • the characteristic change detection unit 871 closes all the reception antenna switches 920, all the antennas included in the reception antenna 810 (eight antennas described as x1 to x4 and y1 to y4 in FIG. 4).
  • the synthesized waves are amplified, noise-removed and demodulated by the signal amplifier circuit 830, the filter circuit 840, and the detector circuit 850, respectively, and converted into a digital signal by the AD converter circuit 860.
  • the signal analysis unit 870 includes a characteristic change detection unit 871 and an object detection unit (radio wave absorber detection unit) 872.
  • the characteristic change detection unit 871 detects a change in the characteristic of the radio wave received by the receiving antenna 810.
  • the characteristic change detection unit 871 measures the characteristics of radio waves such as reception intensity (RSSI), phase, and frequency of radio waves received by the receiving antenna 810 at predetermined time intervals and records them in a memory (not shown).
  • the characteristic change detection unit 871 compares the amount of change in the characteristics of these radio waves with a predetermined threshold, and detects that the characteristic of the radio wave received by the receiving antenna 810 has changed when the amount of change exceeds the threshold. To do.
  • the characteristic change detector 871 detects the phase of the radio wave received by the receiving antenna 810 with reference to the phase of the oscillation signal input via the AD conversion circuit 861.
  • the radio wave absorber 1100 attached to the tip of the pen 1000 absorbs the radio wave having the frequency f transmitted from the transmission antenna 710. Therefore, the reception antenna described as x1 in FIG.
  • the characteristics of the radio wave received by the receiving antenna 810 described as 810 and y3 change.
  • the characteristic change detection unit 871 detects the characteristics of the combined wave of the radio waves received by all the antennas included in the reception antenna 810.
  • the characteristic change detection unit 871 detects that the characteristic of the radio wave has changed in any of the antennas by detecting that the amount of change in the characteristic of the combined wave exceeds a predetermined threshold.
  • the characteristic change detection unit 871 individually controls the reception antenna switch 920 to identify the antenna of the reception antenna 810 whose radio wave characteristic has changed, and only one reception antenna switch 920 (for example, in FIG. 4, The reception antenna switch 920) connected to the antenna described as x1 is closed, and the other reception antenna switch 920 is opened.
  • the characteristic change detection unit 871 measures the characteristics of the radio wave at this time and records it in a memory (not shown).
  • the characteristic change detection unit 871 detects the change in the characteristics of the radio waves received by the plurality of antennas constituting the reception antenna 810 while sequentially switching the reception antenna switch 920 to be closed. When the proximity to the panel unit 610, the antenna to which the pen 1000 has approached is specified.
  • the characteristic change detection unit 871 specifies the antenna with which the pen 1000 is close by measuring and recording the characteristics of the radio waves received by the antennas x1 to x4 and y1 to y4.
  • the characteristic change detection unit 871 compares the characteristics of radio waves received by the antennas of the receiving antenna 810, and among the antennas (x1 to x4) extending in the x-axis direction (the horizontal direction in FIG. 4). From this, the antenna (x1) whose radio wave characteristics have changed is identified. Similarly, the antenna (y3) whose radio wave characteristic has changed is identified from the antennas (y1 to y4) extending in the y-axis direction (the vertical direction in FIG. 4).
  • the characteristic change detection unit 870 selects an antenna (x1) having a relatively different radio wave characteristic from the antennas (x1 to x4) extending in the x-axis direction as an antenna whose radio wave characteristic has changed. Identify. Similarly, the characteristic change detection unit 870 uses an antenna (y3) that has a relatively different radio wave characteristic from the antennas (y1 to y4) that extend in the y-axis direction, and an antenna in which the radio wave characteristic has changed. As specified.
  • the characteristic change detection unit 870 obtains, for example, an average value and dispersion of the characteristics of the radio waves received by each antenna of the receiving antennas 810, and compares them with the individual characteristic values of the radio waves received by each antenna. Antennas whose characteristics are relatively different from others are identified. Alternatively, the characteristic change detection unit 870 identifies an antenna having the largest amount of change in radio wave characteristics.
  • the characteristic change detection unit 871 identifies a pair of antennas, that is, the antenna described as x1 and the antenna described as y3 in FIG.
  • the object detection unit 872 detects that the pen 1000 has approached the point A (x1, y3) of the panel unit 610 where the change in the radio wave characteristic is detected by the characteristic change detection unit 871, and controls the electronic device. Section 900 is notified.
  • the electronic device control part 900 performs the predetermined
  • the characteristic change detection unit 871 measures and records the radio wave characteristics while sequentially switching (x1 to x4, y1 to y4) the reception antenna switch 920 to be closed.
  • the transmitting antenna switch 910 is in a closed state, and radio waves are transmitted from all the antennas of the transmitting antenna 710.
  • the transmitting antenna switch 910 corresponding to the receiving antenna switch 920 in the closed state is also sequentially closed. You may make it do.
  • reception antenna switch 920 described as x1 in FIG. 4 when the reception antenna switch 920 described as x1 in FIG. 4 is closed, only the transmission antenna switch 910 described as a1 corresponding to x1 is closed and described as x2. When the reception antenna switch 920 is closed, only the transmission antenna switch 910 described as a2 corresponding to x2 is closed, and so on. Each time the antenna switch 920 is switched, the corresponding transmission antenna switch 910 can be switched to the closed state.
  • the characteristic change detection unit 871 closes all the reception antenna switches 920 and receives the radio waves received by all the antennas of the reception antenna 810. After detecting that the pen 1000 has touched the panel unit 610, the reception antenna switches 920 are individually closed at predetermined time intervals sequentially. While switching, the characteristics of the radio waves received by the individual antennas are measured, but before and after detecting that the pen 1000 has touched the panel unit 610, the time interval for detecting changes in the characteristics of the radio waves is changed. You can also.
  • the pen 1000 may Power consumption when not in contact with the panel unit 610 can be suppressed.
  • the position of the pen 1000 can be quickly identified by setting a short time interval t2 (second predetermined time) for switching the reception antenna switch 920. Is possible.
  • the characteristic change detection unit 871 detects a change in the characteristic of the combined wave of radio waves every 100 milliseconds, and detects that the pen 1000 has contacted the panel unit 610. After the detection, the radio wave characteristics of the individual antennas of the reception antenna 810 are measured while switching the reception antenna switch 920 every millisecond.
  • the tip of the pen 1000 may be located on the transmitting antenna 710 (a2, b2).
  • the characteristic change detection unit 871 measures the radio wave characteristics of the respective antennas constituting the reception antenna 810 while sequentially switching the reception antenna switch 920, whereby the antenna of the reception antenna 810 extending in the x-axis direction ( Among x1 to x4), it is specified that the radio wave characteristics of the two antennas (x1 and x2) at the positions x1 and x2 have changed. Similarly, it is specified that the radio wave characteristics of the two antennas y1 and y2 (y1 and y2) among the antennas (y1 to y4) of the receiving antenna 810 extending in the y-axis direction intersecting the x-axis direction have changed. To do.
  • the characteristic change detection unit 871 apportions (for example, proportional interpolation) the change amount of the radio wave received by the x1 antenna and the change amount of the radio wave received by the x2 antenna, and changes the radio wave received by the y1 antenna.
  • the position of the pen 1000 may be specified by proportionally (for example, proportionally interpolating) the amount and the amount of change in the radio wave received by the antenna y2.
  • the amount of change of the radio wave received by the antenna x1 is equal to the amount of change of the radio wave received by the antenna x2, and the amount of change of the radio wave received by the antenna y1 is equal to the amount of radio wave received by the antenna y2.
  • the position of the pen 1000 is specified as B ((x1 + x2) / 2, (y1 + y2) / 2) as shown in FIG.
  • the position of the pen 1000 can be specified with higher accuracy.
  • the electronic apparatus 600 absorbs the radio wave transmitted from the transmission antenna 710 by the radio wave absorber 1100 included in the pen 1000, and detects a change in the characteristics of the radio wave received by the reception antenna 810 caused thereby. This method is adopted.
  • the position of the pen 1000 can be detected efficiently.
  • the panel unit 610 is located outside the LCD unit 620 (on the side opposite to the surface on the side where the LCD unit 620 faces the main body component 630). Mounted on the surface.
  • 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 position of the pen 1000 can be detected efficiently.
  • the receiving antenna 810 is not equipped with a tuning circuit that tunes to the radio wave transmitted from the transmitting antenna 710, the circuit configuration can be simplified.
  • the frequency f of the radio wave used by the electronic apparatus 600 according to the present embodiment is preferably 1 megahertz or less, for example, about 500 kilohertz. Accordingly, it is possible to easily obtain parts used when manufacturing the main body device 640 and the pen 1000 while maintaining the position detection accuracy of the pen 1000, and thus it is possible to reduce the cost.
  • Detection system 100 Detection system 200 Transmitter 210 Fixed transmission antenna line 220 Transmission control part 230 Oscillation circuit 240 Driver circuit 250 Antenna adjustment part 251 Extension coil 252 Capacitor 300 Receiver 310 Fixed reception antenna line 320 Reception control part 330 Signal amplification circuit 340 Filter circuit 350 Detection circuit 360 AD conversion circuit 370 Signal analysis unit 371 Characteristic change detection unit 372 Object detection unit 500 Radio wave absorber 600 Electronic device 610 Panel unit 620 LCD unit 630 Main unit configuration unit 640 Main unit 700 Transmission unit 710 Fixed transmission antenna line 720 Transmission control Unit 730 oscillation circuit 740 driver circuit 750 antenna adjustment unit 751 extension coil 752 capacitor 800 reception unit 810 fixed reception antenna line 820 reception control unit 30 signal amplification circuit 840 filter circuit 850 detection circuit 860 AD conversion circuit 861 AD conversion circuit 870 signal analysis unit 871 characteristic change detection unit 872 object detection unit 880 output unit 900 electronic device control unit 910 transmission antenna switch 920 reception antenna switch 1000 electronic pen 1100

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Abstract

L'invention concerne un système de détection caractérisé par la fourniture des éléments suivants : une ligne d'antenne d'émission fixe qui émet des ondes radio ; une ligne d'antenne de réception fixe qui reçoit les ondes radio émises par ladite ligne d'antenne d'émission fixe ; et une unité de détection de changement de caractéristiques qui, si un corps absorbant les ondes radio se rapproche du chemin de propagation des ondes radio émises par la ligne d'antenne d'émission fixe, détecte des changements des caractéristiques des ondes radio reçues par la ligne d'antenne de réception fixe. De préférence, l'unité de détection de changement de caractéristiques détecte des changements de caractéristiques comprenant l'intensité, la fréquence ou la phase des ondes radio reçues par la ligne d'antenne de réception fixe.
PCT/JP2014/071324 2014-08-12 2014-08-12 Système de détection et dispositif électronique WO2016024335A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62138919A (ja) * 1985-12-13 1987-06-22 Hitachi Ltd タブレツト入力装置用入力ペン
JP2001083246A (ja) * 1999-09-16 2001-03-30 Mitsubishi Electric Corp 目標情報検出システム
JP2003345502A (ja) * 2002-05-24 2003-12-05 Aiptek Internatl Inc タブレットカーソルシステム装置とその信号伝送方法
JP2006135928A (ja) * 2004-10-05 2006-05-25 Matsushita Electric Ind Co Ltd 無線タグと読取装置
JP2007531938A (ja) * 2004-04-01 2007-11-08 ファインポイント・イノヴェーションズ・インコーポレーテッド パネルとコードレス・トランスデューサのシステム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62138919A (ja) * 1985-12-13 1987-06-22 Hitachi Ltd タブレツト入力装置用入力ペン
JP2001083246A (ja) * 1999-09-16 2001-03-30 Mitsubishi Electric Corp 目標情報検出システム
JP2003345502A (ja) * 2002-05-24 2003-12-05 Aiptek Internatl Inc タブレットカーソルシステム装置とその信号伝送方法
JP2007531938A (ja) * 2004-04-01 2007-11-08 ファインポイント・イノヴェーションズ・インコーポレーテッド パネルとコードレス・トランスデューサのシステム
JP2006135928A (ja) * 2004-10-05 2006-05-25 Matsushita Electric Ind Co Ltd 無線タグと読取装置

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