WO2016056272A1 - 検出装置、入力装置及び検出方法 - Google Patents
検出装置、入力装置及び検出方法 Download PDFInfo
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- WO2016056272A1 WO2016056272A1 PCT/JP2015/065381 JP2015065381W WO2016056272A1 WO 2016056272 A1 WO2016056272 A1 WO 2016056272A1 JP 2015065381 W JP2015065381 W JP 2015065381W WO 2016056272 A1 WO2016056272 A1 WO 2016056272A1
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- 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
-
- 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
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
-
- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
-
- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04162—Control or interface arrangements specially adapted for digitisers for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware
-
- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
- G06F3/041661—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
Definitions
- the present invention relates to an electromagnetic induction detection device, an input device including the detection device and an indicator, and a detection method used in the detection device.
- Electromagnetic induction type input devices are used as input devices for electronic devices such as high-function mobile phone terminals called tablet-type terminals and smartphones.
- the input device includes a position indicator formed in a pen shape, and a position detection device having an input surface for inputting a pointing operation and characters and drawings using the position indicator.
- the position indicator includes a resonance circuit including a coil and a capacitor.
- the position detection device is a stack of a loop coil group in which a plurality of loop coils are arranged in the horizontal direction (X-axis direction) and a loop coil group in which a plurality of loop coils are arranged in the vertical direction (Y-axis direction).
- a sensor unit is used as input devices for electronic devices such as high-function mobile phone terminals called tablet-type terminals and smartphones.
- the input device includes a position indicator formed in a pen shape, and a position detection device having an input surface for inputting a pointing operation and characters and drawings using the position indicator.
- the position indicator includes a resonance circuit including
- the indication position is detected simply by the following operation.
- one loop coil is selected in a predetermined order from a plurality of loop coils arranged in the sensor unit, and a transmission signal is transmitted from the selected loop coil to the position indicator.
- condenser of a position indicator is charged.
- the loop coil used for transmission is connected to the receiving circuit, a signal transmitted from the resonance circuit of the position indicator is received, and the indicated position is detected based on the received signal.
- Patent Document 1 described later discloses an invention related to an electromagnetic induction type input device.
- Various improvements have been made with respect to the electromagnetic induction type input device.
- Patent Documents 2 and 3 described later disclose a method of operating a coil (scanning method) constituting the sensor unit.
- a transmission signal is transmitted from the position detection device to the position indicator by using, for example, one loop coil of the loop coil group in the X-axis direction immediately below the position indicator. ing.
- the position indicator can receive a signal having a large signal level, and therefore the capacitor of the resonance circuit can be charged efficiently.
- the metal bezel may block a part of a transmission signal transmitted from a nearby loop coil. In this case, although a loop coil directly under the position indicator is used, a transmission signal with a sufficient signal level cannot be provided to the position indicator.
- an input device provided with a sub-sensor unit in a small area that realizes a function as a mode switching button can be considered as an electromagnetic induction type input device.
- the sub-sensor portion in the small area cannot be provided with a large loop coil because the area is small, and it is difficult to provide a plurality of loop coils. For this reason, when the sub-sensor portion of the small area is indicated by the position indicator, a transmission signal having a sufficient signal level cannot be transmitted to the position indicator only from the loop coil immediately below, It may take a long time to supply a sufficient transmission signal.
- the present invention provides an electromagnetic induction type input device that has an appropriate signal level even when there is a metal member that shields a transmission signal in the vicinity of the loop coil or when the loop coil is small.
- the object is to be able to provide a signal to a position indicator.
- the detection device of the invention is An indicator detection apparatus that transmits a signal to an indicator having a resonance circuit to resonate the resonance circuit and receives a signal transmitted from the resonance circuit of the position indicator to detect the indicator.
- a sensor unit comprising a plurality of electrodes for transmitting the signal to the indicator and receiving a signal from the indicator;
- a signal supply circuit that generates a magnetic field from the electrode by supplying a first signal to the sensor unit, transmits a signal to the indicator, and resonates the resonance circuit of the indicator;
- a detection circuit that detects signals from the resonance circuit of the indicator received by the plurality of electrodes constituting the sensor unit;
- the signal supply circuit supplies the first signal to the first electrode having the maximum signal level of the signal from the indicator among the electrodes that have received the signal from the indicator of the sensor unit.
- a signal is generated so that the direction of the magnetic field generated at the second electrode is in the direction of strengthening the magnetic field generated at the first electrode with respect to the second electrode at which the signal level of the received signal is minimize
- the sensor unit includes a plurality of electrodes, and the signal supply circuit supplies the first signal to the sensor unit, whereby the sensor unit supplies the first signal.
- a signal is transmitted to the indicator by generating a magnetic field.
- the resonance circuit of the indicator can be resonated, and a signal is transmitted from the resonance circuit of the indicator to the sensor unit of the detection device.
- the detection circuit detects a signal transmitted from the resonance circuit of the indicator and received by a plurality of electrodes constituting the sensor unit of the own device.
- the signal supply circuit functions based on the detection output from the detection circuit.
- the signal supply circuit supplies the first signal to the first electrode having the maximum signal level of the received signal among the plurality of electrodes of the sensor unit that has received the signal transmitted from the resonance circuit of the indicator
- a predetermined signal is also supplied to the second electrode.
- the second electrode is an electrode having a minimum signal level of the received signal among the electrodes of the sensor unit that has received the signal transmitted from the resonance circuit of the indicator.
- the signal supplied to the second electrode is such that the direction of the magnetic field generated at the second electrode is the direction in which the magnetic field generated at the first electrode is strengthened.
- the signal according to the 1st signal can be transmitted to the indicator from the 1st electrode of the sensor part which received the signal from the indicator most strongly, and further, the 2nd electrode to the indicator Thus, a signal corresponding to the second signal can be transmitted.
- a signal can be transmitted to the indicator from the first electrode and the second electrode, a signal having an appropriate signal level can be provided to the indicator.
- an electromagnetic induction type input device even when a metal member that shields a transmission signal is present in the vicinity of the loop coil or when the loop coil is small, a signal having an appropriate signal level is indicated. Can be provided.
- FIG. 2 is an exploded perspective view for explaining a configuration example of an electronic device 10.
- FIG. It is a block diagram for demonstrating the structural example of 10 N of position detection apparatuses. It is a figure for demonstrating selection of the loop coil which transmits a signal with respect to the position indicator, and the signal transmitted through the selected loop coil. It is a block diagram for demonstrating the structural example of the selection circuit 101 of the position detection apparatus 10N. It is a flowchart for demonstrating the detection process of the designated position performed with the position detection apparatus 10N. It is a figure for showing an example, such as appearance of electronic equipment 10A of a 2nd embodiment.
- FIG. 10 It is a block diagram for demonstrating the structural example of the position detection apparatus 10X. It is a figure for demonstrating the process in the case of transmitting a signal from loop coil 16A, 16B. It is a figure for demonstrating the process in the case of transmitting a signal from loop coil 16A, 16B. It is a flowchart for demonstrating the detection process of the designated position performed with the position detection apparatus 10X. It is a flowchart following FIG. It is a figure for demonstrating the specific example in the case of using a reverse winding coil.
- the position indicator 20 corresponds to the indicator in the claims
- the position detection devices 10N and 10X correspond to the detection devices in the claims.
- FIGS. 1 to 6 A configuration of the electronic apparatus 10 according to the first embodiment will be described with reference to FIGS. 1 and 2.
- An electronic device 10 in this example is a high-function mobile phone terminal called a so-called smartphone.
- an LCD Liquid
- a display screen 12 of a display device composed of a crystal display (liquid crystal display) is provided so as to be visible.
- a translucent sensor unit 13 is disposed on the display screen 12. The display image displayed on the display screen 12 can be viewed through the instruction input surface 13A of the sensor unit 13.
- the electronic device 10 includes a lower housing 11B, a motherboard MB, an LCD having a display screen 12, a sensor unit 13, and an upper housing 11A.
- a motherboard MB Inside the lower housing 11B, in order from the lower housing 11B side, a motherboard MB, an LCD having a display screen 12, and a sensor unit 13 are superposed, and the upper housing 11A is the lower housing 11B. Is sealed.
- various circuits necessary for operating the electronic device 10 such as a sensor controller (to be described later) for controlling the sensor unit 13 and an LCD controller for controlling the LCD are mounted.
- the sensor unit 13 is an electromagnetic induction type sensor, and includes an instruction input surface 13A formed so as to cover the display area of the display screen 12 surrounded by a solid line 12 'in FIG. Prepare.
- the instruction input surface 13A is a detection area for detecting a position indicator, and a loop coil group 15X arranged in a first direction (longitudinal direction of the housing 11; X-axis direction) and a first direction And a loop coil group 15Y arranged in a second direction (Y-axis direction) orthogonal to each other.
- the loop coil group 15X includes n (n is an integer of 2 or more, for example, 40) loop coils X 0 , X 1 ,..., X n arranged in the X-axis direction.
- the loop coil group 15Y includes m (m is an integer of 2 or more, for example, 20) loop coils Y 0 , Y 1 ,..., Y m arranged in the Y-axis direction.
- the plurality of loop coils X 0 to X n and Y 0 to Y m are transparent conductors made of ITO (Indium Tin Oxide), for example, and are formed on a transparent substrate.
- ITO Indium Tin Oxide
- the loop coil group 15X and the loop coil group 15Y are formed separately on the front and back of the transparent substrate.
- loop coils X 0 to X n of the loop coil group 15X are arranged so as to be sequentially overlapped at equal intervals in the X-axis direction of the instruction input surface 13A.
- loop coils Y 0 to Y m of the loop coil group 15Y are arranged so as to be sequentially overlapped at equal intervals in the Y-axis direction of the instruction input surface 13A.
- the position detection device 10N includes a sensor unit 13 and a sensor controller 100, and the position detection device 10N and the position indicator 20 form an input device (input device) of the electronic device 10.
- the sensor unit 13 is connected to a sensor controller 100 provided on the motherboard MB via a connector unit (not shown).
- FIG. 3 also shows a circuit configuration of a pen-type position indicator 20 used for input to the electromagnetic induction type sensor unit 13.
- the position indicator 20 includes a resonance circuit including a coil 20L and a capacitor 20C connected in parallel to the coil 20L.
- the sensor controller 100 connected to the sensor unit 13 constitutes a control circuit of the position detection device 10N.
- the sensor controller 100 includes a selection circuit 101, a transmission / reception switching circuit 102, a transmission signal generation circuit 110, a reception signal processing circuit 120, and a processing control unit 130.
- the transmission signal generation circuit 110 includes an oscillator 111 and a current driver 112.
- the reception signal processing circuit 120 includes a reception amplifier 121, a detection circuit 122, an LPF (Low (Pass Filter) 123, a sampling and holding circuit (indicated as S / H in FIG. 3) 124, and an A / D. (Analog / Digital) conversion circuit 125.
- the processing control unit 130 is configured by a so-called microprocessor.
- the selection circuit 101 is connected to the loop coil group 15X and the loop coil group 15Y of the sensor unit 13.
- the selection circuit 101 sequentially selects loop coils that transmit and receive signals in accordance with a selection control signal from the processing control unit 130 out of the loop coil groups 15X and 15Y of the sensor unit 13.
- the loop coil selected by the selection circuit 101 is connected to the movable terminal M of the transmission / reception switching circuit 102.
- the transmission signal generation circuit 110 is a circuit for supplying a signal to the loop coil, and includes an oscillator 111 and a current driver 112.
- the oscillator 11 generates an AC signal having a frequency f0.
- the AC signal is supplied to the current driver 112 and converted into a current, and then supplied to the transmission / reception switching circuit 102.
- the transmission / reception switching circuit 102 switches the connection destination (transmission side terminal T or reception side terminal R) to which the loop coil selected by the selection circuit 101 is connected at predetermined time intervals under the control of the processing control unit 130.
- a current driver 112 is connected to the transmission side terminal T, and a reception amplifier 121 is connected to the reception side terminal R.
- the transmission / reception switching circuit 102 selects the transmission-side terminal T (during transmission)
- an AC signal from the current driver 112 is supplied to the loop coil selected by the selection circuit 101.
- the transmission / reception switching circuit 102 selects the reception-side terminal R (during reception)
- a signal corresponding to the induced voltage generated in the loop coil selected by the selection circuit 101 is sent to the reception signal processing circuit 120. Supplied.
- the received signal processing circuit 120 is supplied with a signal corresponding to the induced voltage generated in the loop coil selected by the selection circuit 101. This signal is supplied to the reception amplifier 121 via the selection circuit 101 and the reception-side terminal R of the transmission / reception switching circuit 102, amplified, and sent to the detection circuit 122.
- the signal detected by the detection circuit 122 is supplied to the A / D conversion circuit 125 via the LPF 123 and the sampling and holding circuit 124.
- the A / D conversion circuit 125 converts the analog signal detected by the detection circuit 122 into a digital signal and supplies the digital signal to the processing control unit 130.
- the process control unit 130 performs control for detecting the indicated position by the position indicator 20 and performs processing for specifying the indicated position on the instruction input surface 13A by the position indicator 20.
- the control for detecting the indicated position by the position indicator 20 is control of loop coil selection in the selection circuit 101, signal switching control in the transmission / reception switching circuit 102, processing timing of the sampling and holding circuit 124, and the like. .
- the processing control unit 130 controls the transmission / reception switching circuit 102 to switch the selection circuit 101 to be connected to the transmission-side terminal T, and the alternating current signal transmitted from the transmission signal generation circuit 110 is switched to the loop coil group 15X or This is supplied to the loop coil selected by the selection circuit 101 in the loop coil group 15Y.
- a signal is transmitted by electromagnetic induction from the loop coil to which the AC signal from the transmission signal generation circuit 110 is supplied.
- a signal transmitted from the position detection device 10N to the position indicator 20 is referred to as a transmission signal.
- the resonance circuit of the position indicator 20 receives the signal transmitted from the loop coil, charges the capacitor 20C, generates an induced voltage in the coil 20L, and transmits a reflected signal.
- the processing control unit 130 performs switching control so that the transmission / reception switching circuit 102 is connected to the receiving-side terminal R.
- an induced voltage is generated in each loop coil of the loop coil group 15X and the loop coil group 15Y by a reflected signal transmitted from the position indicator 20.
- the reflected signal transmitted from the position indicator 20 is detected through the received signal processing circuit 120.
- the process control unit 130 calculates the coordinate values of the indicated positions in the X-axis direction and the Y-axis direction on the instruction input surface 13A of the sensor unit 13 based on the level of the voltage value of the induced voltage generated in each loop coil.
- the processing control unit 130 instructs the X-axis direction and the Y-axis direction on the instruction input surface 13A of the sensor unit 13 based on the signal level of the received signal received by each loop coil that is grasped as a voltage value.
- the coordinate value of the position is calculated.
- the processing control unit 130 supplies the calculated coordinate value information to, for example, the LCD controller of the motherboard so that display control according to the designated position can be performed.
- a signal (reflected signal) transmitted from the position indicator 20 and received by the position detection device 10N is referred to as a received signal.
- the position detection device 10N including the sensor unit 13 and the sensor controller 100 repeats the transmission of the signal to the position indicator 20 and the reception of the reflected signal from the position indicator 20 to thereby repeat the position indicator.
- the designated position on the designated input surface 13A designated through 20 is specified.
- FIG. 4 (A) when the left end of the loop coil group 15X there are 13 th loop coil X 12 position indicator 20 on the received signal in each of the loop coils X 0 ⁇ X n of the loop coil groups 15X It is the graph which measured and showed the signal level (voltage value) of.
- FIG. 4B is a diagram for explaining a case where a predetermined signal is transmitted through the selected loop coil.
- the horizontal axis indicates the position of each loop coil of the loop coil group 15X
- the vertical axis indicates the signal level of the received signal received by each loop coil.
- high signal level of the received signal in the loop coil X 12 directly under the position indicator 20 is best, with increasing the loop coil away from the loop coil X 12, the signal level of the received signal decreases .
- the signal level of the received signal at the loop coil X 12 immediately below the position indicator 20 is maximized, and in a region composed of the loop coils X 10 , X 11 , X 12 , X 13 , X 14.
- a so-called main lobe is formed.
- so-called side lobes are formed in which the direction of the signal level is opposite (minus direction) with respect to the main lobe.
- the side lobes one formed a loop coil X 9 as a minus direction apex of, and one formed a loop coil X 15 as a minus direction vertex.
- the loop coil signal level of the reception signal across the loop coil X 12 is minimum If signals are transmitted also from X 9 and X 15 , an induced voltage can be efficiently generated in the coil 20L of the position indicator 20. Therefore, the loop coil X 12, it is conceivable to supply the same signal to the loop coil X 9, X 15.
- the signal level of the received signal is maximum, supplying a signal (first signal) from the transmission signal generating circuit 110
- first signal For the loop coils X 9 and X 15 where the signal level of the received signal is minimum, the phase of the first signal from the transmission signal generation circuit 110 is inverted, and the phase of the first signal is opposite to that of the first signal.
- a signal (second signal) is supplied. Then, as shown in the lower graph of FIG. 4 (A), the signal flowing in the loop coil X 12 directly under the position indicator 20, the loop coil X 9, X 15 to the signal level of the received signal is minimized The flowing direction of the signal is opposite to that of the flowing signal.
- the direction of the magnetic field generated in the adjacent loop coils are the same, the induced magnetic field generated in the loop coil X 12, and the induced magnetic field generated in the loop coil X 9, X 15 It is possible to prevent mutual cancellation. Therefore, compared with the case where the signal level of the received signal is supplied a signal from only the loop coil X 12 directly under the position indicator 20 having the maximum, it is possible to significantly increase the signal to be supplied to the position indicator 20.
- position indicator 20 even when deviated to the left or right direction of the loop coils X 12, position indicator 20 is not only from the loop coil X 12, loop coils X it can be supplied with signals from the 9 and the loop coil X 15. Therefore, the supply of the signal supplied to the position indicator 20 can be greatly increased compared to the conventional case.
- the first signal is supplied from the transmission signal generation circuit 110 to the loop coil corresponding to the vertex position of the main lobe in the received signal distribution, and corresponds to the vertex position of the side lobe.
- the selection circuit 101 includes a phase inverting circuit so that a second signal having a phase opposite to that of the first signal is supplied to the loop coil.
- each of the loop coils X 0 to X n of the loop coil group 15X includes a phase inversion circuit 1X (1), 1X (2),... And a switch circuit 2X (1), 2X ( 2), ... are provided.
- Each of the loop coils Y 0 to Y m of the loop coil group 15Y has a phase inversion circuit 1Y (1), 1Y (2),... And a switch circuit 2Y (1), 2Y (2),. Is provided.
- phase inversion circuits 1X (1), 1X (2),... are collectively referred to as the phase inversion circuit 1X
- the switch circuits 2X (1), 2X (2) are collectively referred to as a switch circuit 2X
- the phase inversion circuits 1Y (1), 1Y (2),... are collectively referred to as a phase inversion circuit 1Y
- the switch circuits 2X and 2Y of this example include terminals a and b, and the loop coil can be moved by the transmission / reception switching circuit 102 without being switched to the terminals a and b or any of the terminals under the control of the processing control unit 130. This is a switch circuit that can be connected to a terminal.
- the selection circuit 101 switches the switch circuit 2X connected to the loop coil immediately below the position indicator 20 to the terminal a side, and receives the signal of the received signal.
- the switch circuit 2X connected to the loop coil having the lowest level is switched to the terminal b side.
- each loop coil of the loop coil group 15X is connected to the movable terminal M of the transmission / reception switching circuit 102, and the position indicated by the position indicator 20 is detected.
- the operation of the selection circuit 101 has been described with respect to the case where signals are transmitted and received through the loop coil group 15X.
- the loop coil group 15Y is also configured when signals are transmitted and received through the loop coil group 15Y.
- the switch circuit 2Y connected to each loop coil operates in the same manner as the switch circuit 2X.
- FIG. 6 is a flowchart for explaining the detection processing of the designated position executed by the position detection device 10N.
- the processing control unit 130 controls the selection circuit 101 to sequentially select the loop coils X 0 to X n of the loop coil group 15X, and controls the transmission / reception switching circuit 102 to select the selection by the selection circuit 101.
- the process of detecting the loop coil having the maximum signal level of the received signal is executed by repeating the supply of the signal to the selected loop coil and the reception of the signal by the selected loop coil (step S1).
- the process of step S1 is referred to as an X-axis global scan.
- the processing control section 130 controls the selection circuit 101 switches the switch circuits 2X, which is connected to, for example, the first loop coil X 0 of the loop coil groups 15X (1) to the terminal a side, At the same time that the loop coil X 0 is connected to the movable terminal M of the transmission / reception switching circuit 102, the transmission / reception switching circuit 102 is controlled to cause the movable terminal M to select the transmission-side terminal T and to be supplied from the transmission signal generation circuit 110. transmitting the f0 signal to the loop coil X 0.
- the processing control section 130 controls the transmission and reception switching circuit 102, by selecting the reception side terminal R to the movable terminal M, the signal reception signal processing circuit of the position indicator 20 received through the loop coil X 0 The signal level of the received signal is detected.
- the processing control unit 130 performs such signal transmission / reception processing for each of the loop coils X 0 to X n constituting the loop coil group 15X, so that the position indicator 20 comes close to or touches the instruction input surface 13A. If it is close or in contact, the loop coil in the X axis direction immediately below is specified.
- step S2 determines whether or not there is a loop coil whose signal level (voltage value) of the received signal is equal to or greater than a certain value (step S2).
- the determination process of step S2 is a process of determining whether or not the position indicator 20 is within the effective reading height of the position detection device 10N.
- the position indicator 20 is not in proximity to or in contact with the instruction input surface 13A. Repeats the process from step S1.
- step S2 if it is determined that there is a loop coil with the signal level of the received signal equal to or greater than a certain value, the process control unit 130 determines the loop coil group based on the processing result in step S1.
- the peak coil with the highest signal level of the received signal and the bottom coil with the lowest signal level of the received signal are extracted (specified), and the coil numbers are stored (step S3).
- the highest loop coil X 12 is the signal level of the received signal is extracted as a peak coil
- the signal level of the received signal is two lowest loop coil X 9 and X 15 are extracted as bottom coils.
- the processing control unit 130 controls the selection circuit 101 to sequentially select the loop coils Y 0 to Y m of the loop coil group 15Y, and controls the transmission / reception switching circuit 102 so that the selection circuit 101 A process of detecting a loop coil having a high signal level of the received signal is executed by repeatedly supplying a signal to the selected loop coil and receiving a signal by the selected loop coil (step S4).
- the processing in step S4 is referred to as Y-axis global scan.
- step S4 the processing control section 130 first controls the selection circuit 101, for example, the first loop coil Y 0 to the connected switching circuits 2Y (1) the terminal a side of the loop coil group 15Y switch to, at the same time to connect the loop coil Y 0 in the movable terminal M of the reception switching circuit 102, and controls the transmission and reception switching circuit 102, by selecting a transmission side terminal T to the movable terminal M, from the transmission signal generating circuit 110 transmitting a signal of frequency f0 supplied to the loop coils Y 0.
- the processing control section 130 controls the transmission and reception switching circuit 102, the movable terminal by selecting the reception side terminal R to the M, signal reception signal processing circuit of the position indicator 20 received through the loop coil Y 0 The signal level of the received signal is detected.
- the processing control unit 130 performs such signal transmission / reception processing for each of the loop coils Y 0 to Y m constituting the loop coil group 15Y, so that the position indicator 20 comes close to or contacts the instruction input surface 13A. If it is close or in contact, the loop coil in the Y axis direction immediately below is specified.
- step S5 the processing control unit 130, among the loop coils of the loop coil group 15Y, the peak coil having the highest received signal level and the bottom coil having the lowest received signal level. Are extracted (specified) and the coil number is stored (step S5).
- the determination process corresponding to step S2 described above is not performed after the Y-axis global scan is that, in the process step of step S4, the position indicator 20 is activated by the position detection device 10N by the determination process of step S2. This is because it is determined that it is within the reading height, and it is not necessary to determine again.
- the processing control unit 130 appropriately thins out one loop coil or two loop coils without selecting all the loop coils of the loop coil groups 15X and 15Y. May be selected. Moreover, you may make it perform transmission / reception of the signal with respect to one loop coil in multiple times. Furthermore, the transmission time for each loop coil and the reception time for each loop coil must be equal, but the transmission time and the reception time are not necessarily the same.
- the process control unit 130 is a process of transmitting and receiving signals with respect to a predetermined number of loop coils adjacent to the peak coil, for example, five loop coils, with the peak coil in the loop coil group 15X as the center.
- An axis sector scan is performed (step S6).
- the processing control unit 130 selects to transmit the signal through the peak coil and the bottom coil.
- the circuit 101 is controlled.
- the processing control unit 130 performs control so that the switch circuit 2X connected to the peak coil is switched to the terminal a side, and the switch circuit 2X connected to the bottom coil is switched to the terminal b side.
- a signal corresponding to a signal (first signal) from the transmission signal generation circuit 110 is transmitted from the peak coil, and a signal (first signal) from the transmission signal generation circuit 110 is transmitted from the bottom coil.
- a signal corresponding to the signal (second signal) obtained by inverting the phase is transmitted. Therefore, the signal can be supplied to the position indicator 20 so that the signal transmitted from the peak coil and the signal transmitted from the bottom coil do not cancel each other.
- the processing control unit 130 sets the loop coil (five in this example) to the coil number. Switch to ascending (or descending) order. By this X-axis sector scan, the position indicated by the position indicator 20 can be accurately specified in the vicinity of the peak coil.
- the process control unit 130 is a process for transmitting and receiving signals with respect to a predetermined number of loop coils adjacent to the peak coil, for example, five loop coils, with the peak coil in the loop coil group 15Y as the center.
- An axis sector scan is performed (step S7).
- the processing control unit 130 selects to transmit the signal through the peak coil and the bottom coil.
- the circuit 101 is controlled.
- the processing control unit 130 performs control so that the switch circuit 2Y connected to the peak coil is switched to the terminal a side, and the switch circuit 2Y connected to the bottom coil is switched to the terminal b side.
- a signal corresponding to a signal (first signal) from the transmission signal generation circuit 110 is transmitted from the peak coil, and a signal (first signal) from the transmission signal generation circuit 110 is transmitted from the bottom coil.
- a signal corresponding to the signal (second signal) obtained by inverting the phase is transmitted. Therefore, the signal can be supplied to the position indicator 20 so that the signal transmitted from the peak coil and the signal transmitted from the bottom coil do not cancel each other.
- the processing control unit 130 arranges the loop coils (five in this example) in ascending order (or Switch to descending order.
- the position indicated by the position indicator 20 can be accurately specified in the vicinity of the peak coil.
- Step S8 determines whether or not the maximum value of the signal level of the received signal obtained in the processes in steps S6 and S7 is equal to or greater than a predetermined value (Ste S8).
- the determination process of step S8 is a process of determining whether or not the position indicator 20 is within the effective reading height of the position detection device 10N.
- the position indicator 20 determines that the position is not in proximity to or in contact with the instruction input surface 13A. Control unit 130 repeats the processing from step S1.
- the processing control unit 130 performs the X-axis sector scan in step S6 and the step S7. Based on the processing result of the Y-axis sector scan, the peak coil and the bottom coil in the loop coil group 15X and the loop coil group 15Y are extracted (specified).
- the bottom coil for the peak coil extracted in step S9 is extracted (specified) based on the positional relationship between the peak coil and the bottom coil extracted by the processing in steps S1 to S5.
- loop coil X 12 is as a peak coil
- the loop coil X 9, X 15 is extracted as the bottom coil
- the loop coil is located at a position shifted by three coils before and after the peak coil. For this reason, if a peak coil is extracted in step S9, for example, it is shifted by three coils before and after the peak coil based on the positional relationship between the peak coil and the bottom coil extracted in the processing of steps S1 to S5.
- the loop coil at the specified position is extracted (specified) as a bottom coil.
- the processing control unit 130 indicates the position indicated on the instruction input surface 13A by the position indicator 20 based on the position of the peak coil of the loop coil group 15X and the position of the peak coil of the loop coil group 15Y extracted in step S9. Is calculated (step S10).
- the calculated coordinate values are supplied to an LCD controller (not shown) provided on the motherboard MB and used for display control and the like.
- the process control part 130 repeats the process from step S6.
- the peak coil and the bottom coil are extracted by the X-axis global scan and the Y-axis global scan. That is, in the position detection device 10N, the peak coil and the bottom coil that transmit a signal are specified based on the received signal distribution in the sensor unit 13 of the reflected signal transmitted from the position indicator 20.
- the signal transmitted from the peak coil and the signal transmitted from the bottom coil do not cancel each other. Can be sent. Thereby, the signal supplied with respect to the position indicator 20 from the sensor part 13 can be increased. In addition, it is not necessary to enlarge the loop coil of the sensor unit 13 or drive the transmission signal generation circuit with a high voltage and a large current.
- FIGS. 7 to 12 [Configuration of Electronic Device 10A] The configuration of the electronic apparatus 10A according to the second embodiment will be described with reference to FIGS.
- the electronic device 10 of this example is also a high-function mobile phone terminal called a so-called smartphone, similarly to the electronic device 10 of the first embodiment.
- a so-called smartphone similarly to the electronic device 10 of the first embodiment.
- an electronic device provided with auxiliary input units 14A and 14B having a touch sensor function, for example, in the peripheral part of the display screen 12 10A will be described as an example.
- the auxiliary input portions 14A and 14B are provided with loop coils 16A and 16B, respectively.
- the electronic device 10A of the second embodiment is configured in substantially the same manner as the electronic device 10 of the first embodiment.
- FIGS. 7 to 12 used to describe the electronic apparatus 10A of the second embodiment the same configuration as that of the electronic apparatus 10 of the first embodiment described with reference to FIGS. Parts or corresponding parts are denoted by the same reference numerals, and detailed description thereof will be omitted because it is duplicated.
- the electronic apparatus 10A includes a display screen 12 on one side (left side in FIG. 7) in the longitudinal direction (X-axis direction) of the housing 11. Is a separate area, and close to the display screen 12, auxiliary input sections 14A and 14B are provided.
- the auxiliary input units 14A and 14B are configured by, for example, electrostatic sensors being arranged, and specific functions that are frequently used such as a menu display function and a cancel function of each application are assigned.
- the same electromagnetic induction type auxiliary sensor portion 16 as the sensor portion 13 is provided as shown in FIG.
- the auxiliary sensor unit 16 includes loop coils 16A and 16B corresponding to the auxiliary input units 14A and 14B, respectively.
- the auxiliary sensor unit 16 may form the loop coils 16A and 16B with a transparent conductor on a transparent substrate. However, since the auxiliary sensor unit 16 is not superimposed on the display screen 12, the auxiliary sensor unit 16 may be formed with an opaque conductor on an opaque substrate. The loop coils 16A and 16B may be formed.
- the position detection apparatus 10X is configured by connecting the sensor unit 13 and the auxiliary sensor unit 16 to a sensor controller 100A provided on the motherboard MB via a connector unit (not shown).
- This sensor controller 100A constitutes a control circuit of the position detection device 10X.
- the 8 also shows a circuit configuration of a position indicator 20 used for input to the sensor unit 13 and the auxiliary sensor unit 16 which are electromagnetic induction type sensors.
- the position indicator 20 is the same as the position indicator 20 in the first embodiment.
- the sensor controller 100A includes a plurality of loop coils X 0 to X n and Y 0 to Y m of the loop coil groups 15X and 15Y of the sensor unit 13.
- X-axis global scan the Y-axis global scan
- X-axis sector scan the X-axis sector scan
- Y-axis sector scan the Y-axis sector scan in the first embodiment
- the sensor controller 100A detects the indicated position by the position indicator 20 on the indication input surface 13A from the results of the X-axis global scan, Y-axis global scan, X-axis sector scan, and Y-axis sector scan in the sensor unit 13. I do. Further, the sensor controller 100A determines whether or not the position indicator 20 is detected by any one of the auxiliary input units 14A and 14B from the detection results of the two loop coils 16A and 16B provided in the auxiliary sensor unit 16. The detection process is performed.
- the sensor controller 100A detects the sensor unit 13 A global scan is performed for all of the loop coils X 0 to X n and Y 0 to Y m , and the loop coils 16A and 16B are alternately detected at predetermined time intervals for the auxiliary sensor unit 16.
- the sensor controller 100A performs X-axis sector scan with respect to the sensor unit 13 using a plurality of loop coils in the vicinity of the detection position of the position indicator 20.
- the auxiliary sensor unit 16 is controlled to stop the detection of the position indicator 20 in this example.
- the sensor controller 100A detects the position indicator 20 with either of the auxiliary input units 14A and 14B
- the sensor controller 100A alternately scans the loop coils 16A and 16B at predetermined time intervals. In this case, the sensor controller 100A performs control so that the detection of the position indicator 20 in the sensor unit 13 is suspended. Note that only a part of the loop coil in the peripheral area of the sensor unit 13 adjacent to the auxiliary sensor unit 16 may be detected at a predetermined speed.
- the position detection device 10X of this example includes the sensor unit 13 and the auxiliary sensor unit 16, and performs the detection operation of the position indicator 20 in each of them. For this reason, as shown in FIG. 8, the position detection device 10X is different from the position detection device 10N of the first embodiment shown in FIG. 3 in the loop coils 16A and 16B of the auxiliary sensor unit 16 and the sensor switching. Circuits 103 and 104, a transmission / reception switching circuit 105, and a selection circuit 106 are provided.
- the loop coils 16A and 16B of the auxiliary sensor unit 16 are smaller than the loop coils constituting the loop coil group 15X and the loop coil group 15Y. For this reason, a signal with sufficient energy may not be supplied to the position indicator 20 only from the loop coils 16 ⁇ / b> A and 16 ⁇ / b> B of the auxiliary sensor unit 16.
- the position detection apparatus 10X of the second embodiment when the position indicator 20 is detected through the loop coils 16A and 16B of the auxiliary sensor unit 16, not only the loop coils 16A and 16B but also the adjacent sensor units. Signals are transmitted simultaneously from the 13 loop coils.
- the loop coil used in this case when the loop coil 16A or the loop coil 16B receives a signal from the position indicator 20, the loop coil of the loop coil group 15X in which the signal level of the received signal is the lowest is used.
- a signal is transmitted from the loop coil that acts greatly on the position indicator 20, and the position indicator 20 is efficiently transmitted.
- a signal can be supplied.
- the position detection device 10X includes a sensor unit 13, an auxiliary sensor unit 16, and a sensor controller 100A.
- the position detection device 10X and the position indicator 20 form an input device (input device) of the electronic device 10. ing.
- the sensor controller 100A connected to the sensor unit 13 constitutes a control circuit of the position detection device 10X.
- the sensor controller 100A includes a selection circuit 101, a transmission / reception switching circuit 102, a transmission signal generation circuit 110, a reception signal processing circuit 120, sensor switching circuits 103 and 104, a selection circuit 106, and a processing control unit 130A. Prepare.
- the sensor switching circuit 103 is a circuit for selectively supplying a signal supplied from the transmission signal generation circuit 110 to the sensor unit 13 and the auxiliary sensor unit 16 based on the control of the processing control unit 130A.
- the movable terminal M is connected to the output terminal of the transmission signal generation circuit 110
- the terminal D is connected to the transmission side terminal T of the transmission / reception switching circuit 102
- the terminal K is the transmission / reception switching circuits 102, 105. Are connected to the transmitting terminal T.
- the sensor switching circuit 104 is a circuit for selectively connecting the sensor unit 13 or the auxiliary sensor unit 16 to the reception signal processing circuit 120 at the subsequent stage under the control of the processing control unit 130A.
- the sensor switching circuit 104 includes one movable terminal M and terminals K and D.
- the movable terminal M is connected to the input terminal of the reception signal processing circuit 120, and the terminal D is a reception side terminal R of the transmission / reception switching circuit 102.
- the terminal K is connected to the receiving side terminal R of the transmission / reception switching circuit 105, respectively.
- the transmission / reception switching circuit 105 is a circuit for switching transmission / reception of signals in the auxiliary sensor unit 16 under the control of the processing control unit 130A.
- the transmission / reception switching circuit 105 includes terminals R and T and a movable terminal M.
- the terminal R is the terminal K of the sensor switching circuit 104
- the terminal T is the terminal K of the sensor switching circuit 103
- the movable terminal M is a selection circuit described later.
- 106 are respectively connected to the output terminals.
- the transmission / reception switching circuit 105 is connected to the loop coil selected by the selection circuit 106 under the control of the processing control unit 130A (transmission side terminal T or reception side terminal R). Are switched at predetermined time intervals, and transmission and reception are switched in a time-sharing manner.
- the selection circuit 106 selectively connects the transmission signal generation circuit 110 or the reception signal processing circuit 120 to one of the loop coils 16A and 16B of the auxiliary sensor unit 16 via the transmission / reception switching circuit 105 under the control of the sensor controller 100A. It is a circuit for doing.
- This selection circuit 106 has two input terminals and one output terminal, one input terminal is connected to the loop coil 16A, the other input terminal is connected to the loop coil 16B, and the output terminal is a transmission / reception switching circuit. 105 are connected to movable terminals M, respectively.
- the selection circuit 106 selects one of the loop coils 16A and 16B under the control of the processing control unit 130A.
- the sensor switching circuit 103 and the sensor switching circuit 104 are switched to the terminal D when the sensor unit 13 detects the position indicator 20 and the auxiliary sensor unit 16 detects the position indicator 20 under the control of the processing control unit 130A. It is switched to the terminal K side. As described above, the terminal K of the sensor switching circuit 103 is connected to the transmission / reception switching circuit 102 and the transmission terminal T side of the transmission / reception switching circuit 105 under the control of the processing control unit 130A. This is because signals are transmitted from the loop coils of the adjacent loop coil group 15X in addition to the coil 16A or the loop coil 16B.
- the process control unit 130A is a circuit for controlling each unit of the sensor controller 100A. Specifically, the processing control unit 130A performs loop coil selection control in the selection circuit 101 and the selection circuit 106, and switching control of the sensor switching circuit 103, the sensor switching circuit 104, the transmission / reception switching circuit 102, and the transmission / reception switching circuit 105. I do. Further, the processing control unit 130 ⁇ / b> A performs detection processing of the pointing position of the position indicator 20 in the sensor unit 13 and detection processing of the position pointing device 20 in the auxiliary sensor unit 16.
- the process control unit 130A switches the sensor switching circuit 103 and the sensor switching circuit 104 to the terminal D side when the position indicator 20 is detected in the sensor unit 13.
- the output terminal of the transmission signal generation circuit 110 is connected to the transmission side terminal T of the transmission / reception switching circuit 102 through the sensor switching circuit 103, and the reception side terminal R of the transmission / reception switching circuit 102 is connected to the sensor switching circuit 104. It is connected to the input terminal of the reception signal processing circuit 120.
- the transmission / reception switching circuit 102 selects the transmission side terminal T (during transmission)
- an AC signal from the current driver 112 is supplied to the loop coil selected by the selection circuit 101.
- the signal from the transmission signal generation circuit 110 is supplied to the loop coil selected by the selection circuit 101 in the loop coil group 15X or the loop coil group 15Y, and the signal is transmitted from the loop coil.
- the resonance circuit of the position indicator 20 is supplied with a signal sent from the loop coil and stores energy.
- the transmission / reception switching circuit 102 selects the reception side terminal R (during reception)
- a signal corresponding to the induced voltage generated in the loop coil selected by the selection circuit 101 is supplied to the reception signal processing circuit 120. Is done.
- the position indicator 20 indicates the position on the sensor unit 13
- the induced voltage is applied to each loop coil of the loop coil group 15X and the loop coil group 15Y by the reflected signal transmitted from the position indicator 20. Will occur.
- the signal from the loop coil selected by the selection circuit 101 of the loop coil group 15X and the loop coil group 15Y is supplied to the reception signal processing circuit 120, the signal level of the reception signal is detected, and the indication position is calculated. Used for.
- the sensor unit 13 is also configured to perform X-axis global scan, X-axis sector scan, and Y for the loop coil group 15X and the loop coil group 15Y, respectively.
- An axis global scan and a Y-axis sector scan are performed.
- signals are transmitted from the peak coil that is the loop coil having the highest signal level of the received signal detected during the global scan and the bottom coil that is the loop coil having the lowest signal level of the received signal.
- the bottom coil is supplied with the second signal obtained by inverting the phase of the first signal to be supplied to the peak coil so as to have the opposite phase.
- the process control unit 130A switches the sensor switching circuit 103 and the sensor switching circuit 104 to the terminal K side during the detection process of the position indicator 20 in the auxiliary sensor unit 16.
- the output terminal of the transmission signal generation circuit 110 is connected to the transmission side terminal T of the transmission / reception switching circuits 102 and 105 through the sensor switching circuit 103.
- the reception side terminals R of the transmission / reception switching circuits 102 and 105 are connected to the input terminal of the reception signal processing circuit 120 through the sensor switching circuit 104.
- the selection circuit 106 alternately selects the two loop coils 16A and 16B under the control of the processing control unit 130A.
- the transmission / reception switching circuit 105 is controlled to be switched by the processing control unit 130 ⁇ / b> A, and performs signal transmission and signal reception from the position indicator 20.
- the selection circuit 106 selects the loop coil 16B
- the transmission / reception switching circuit 105 is controlled to be switched by the control of the processing control unit 130A, so that signal transmission and signal reception from the position indicator 20 are performed. Is called. In this way, signals are transmitted and received through the loop coils 16A and 16B, and it is detected through which loop coil the signal from the position indicator 20 is received.
- the position detection device 10X of this example when the position indicator 20 is detected by the auxiliary sensor unit 16 and when signals are transmitted from the loop coils 16A and 16B, the loop coils of the adjacent loop coil group 15X are used. Also send a signal. 9 and 10 are diagrams for explaining processing when signals are transmitted from the loop coils 16A and 16B.
- the processing control unit 130 ⁇ / b> A receives reception signal signals of the loop coils of the auxiliary sensor unit 16 and the sensor unit 13. Measure the level.
- the received signal distribution in the sensor coil is as shown in the received signal distribution graph shown on the lower side of FIG. That is, the signal level of the received signal, the loop coil 16A of the auxiliary sensor section 16, the most high in 16B, the signal level of the loop coil 16A, the received signal of the loop coils X 0 of the loop coil groups 15X adjacent to 16B is one The lowest.
- the signal level of the received signal gradually increases as the signal level of the received signal is farther from the lowest loop coil 16A, 16B, and the level value converges around “0”.
- the signal level of the received signal at the loop coil X 0 of the loop coil groups 15X is assumed to have been lowest, the loop coils 16A, 16B when the position indicator 20 above is located, and the loop coil 16A or the loop coil 16B immediately below the position indicator 20, by transmitting a signal from the loop coil X 0 of the loop coil group 15X, position indicator
- a signal can be efficiently supplied to 20.
- the position detecting device 10X of this embodiment when detecting the position indicator 20 in the auxiliary sensor section 16 transmits the loop coil 16A, and 16B, the signal from the loop coil X 0 Metropolitan loop coil group 15X.
- the loop coils 16A with respect to the induced magnetic field generated in 16B, cancel each other and the direction of the induced magnetic field is opposite that occurs in the loop coil X 0 of the loop coil groups 15X End up.
- the loop coil 16A, 16B is supplied with the signal from the transmission signal generation circuit 110 as it is, and a signal corresponding to this is transmitted to the position indicator 20.
- the signal in the loop coil X 0 of the loop coil groups 15X to signal the phase inversion from the transmission signal generating circuit 110, the signal from the transmission signal generating circuit 110 supplies a signal of opposite phase, in accordance with this Is transmitted to the position indicator 20.
- the signal that can be supplied to the position indicator 20 can be increased.
- a signal that can be supplied to the position indicator 20 by transmitting a signal using both the loop coils 16A and 16B of the auxiliary sensor unit 16 and the loop coil of the loop coil group 15X adjacent to the loop coils 16A and 16B. And sufficient power can be supplied to the capacitor 20C of the resonance circuit of the position indicator 20.
- each process of step S1 to step S10 shown in FIG. 11 is the same as the process performed at each corresponding step shown in FIG. That is, each process of step S1 to step S10 shown in FIG. 11 is a detection process for the sensor unit 13. Therefore, the description of steps S1 to S10 in FIG. 11 is omitted because it overlaps with the description of FIG.
- the processing control unit 130A of the position detection device 10X performs a loop coil in which the signal level of the received signal is equal to or greater than a predetermined value in the determination processing in step S2 after the X-axis global scan processing in step S1.
- the process control unit 130A proceeds to the process of step S21 in FIG.
- the process control unit 130A controls each unit to perform the detection process in the auxiliary sensor unit 16 (step S21).
- a signal can be efficiently supplied to the position indicator 20.
- step S21 when the detection of the position indicator 20 in the auxiliary sensor unit 16 is completed, the process control unit 130A determines whether the signal level (voltage value) of the reception signal of the loop coil 16A or the loop coil 16B is equal to or higher than a certain value. It is determined whether or not (step S22).
- the determination process of step S22 is a process of determining whether or not the position indicator 20 is within the effective reading height of the auxiliary sensor unit 16. If it is determined in step S22 that there is no loop coil having a signal level of the received signal equal to or greater than a certain value, the position indicator 20 is not in proximity to or in contact with the auxiliary sensor unit 16, and thus the processing control unit 130A. Returns to step S1 and repeats the subsequent processing.
- step S22 If it is determined in step S22 that there is a loop coil having a received signal level equal to or higher than a certain value, the loop coil immediately below the position indicator 20 is identified as the loop coil 16A or the loop coil 16B (step S22).
- step S23 the process of step S23 is a process of specifying which auxiliary input unit is selected from the auxiliary input unit 14A and the auxiliary input unit 14B.
- step S23 the process assigned to the selected area of the auxiliary input unit 14A and the auxiliary input unit 14B is executed. And after the process of step S23, the process from step S21 of FIG. 12 is repeated, and the detection process of the auxiliary sensor part 16 is continued.
- the position detection device 10X mounted on the electronic apparatus 10A according to the second embodiment can supply sufficient energy to the position indicator 20 even during the detection process of the auxiliary sensor unit 16. Therefore, there is no need to increase the loop coils 16A and 16B of the auxiliary sensor unit 16, and it is not necessary to increase the size of the transmission signal generation circuit.
- the signal from the transmission signal generation circuit 110 is supplied as it is to the peak coil, and the signal obtained by inverting the phase of the signal from the transmission signal generation circuit 110 is supplied to the bottom coil.
- the present invention is not limited to this as long as the signal transmitted from the peak coil and the signal transmitted from the bottom coil can be transmitted without canceling each other.
- the bottom coil is reversely wound with respect to the peak coil, sufficient energy can be supplied to the position indicator 20 without inverting the phase of the signal supplied to the bottom coil.
- FIG. 13A As shown in FIG. 13A, here, as in the case of the position detection device 10X of the second embodiment described above, in addition to the sensor unit 13, an auxiliary sensor unit 16 is provided, and the position indicator 20 loop coil 16A of the auxiliary sensor 16 immediately below the, 16B are positioned, the loop coils 16A, 16B becomes the peak coil, the loop coil X 0 of the sensor unit 13 is explained as an example a case where the bottom coil.
- the winding direction of the bottom coil X 0 as shown in FIG. 13 (A), the loop coil 16A as a peak coil, keep the opposite direction to the 16B.
- the direction of the magnetic field loop coil X 0 is generating, the loop coil
- the directions of the magnetic fields generated by 16A and 16B can be made the same so that they do not cancel each other.
- the sensor unit 13 includes a loop coil group 15X and a loop coil group 15Y including a plurality of loop coils.
- One end of each of the loop coils X 0 to X n of the loop coil group 15X and each of the loop coil groups Y 0 to Y m of the loop coil group 15Y are connected to the selection circuit 101, and the other end is grounded.
- the end connected to the selection circuit 101 and the end connected to the ground are connected to the loop coil serving as the peak coil. May be provided with a selection circuit for switching so as to connect in reverse.
- the loop coil constituting the loop coil group 15X and the loop coil constituting the loop coil group 15Y are, for example, electrodes such as 1 turn (winding), 2 turns, and 3 turns. Is formed by winding.
- the loop coils 16A and 16B of the auxiliary sensor unit 16 are also formed by winding an electrode. The number of turns of these loop coils can be set appropriately.
- the electrodes used to configure the sensor units 13 and 16 are not limited to loop coils. As shown in the second embodiment, if a signal is supplied with phase inversion, even when the sensor unit 13 and the auxiliary sensor unit 16 are configured using a plurality of single electrodes (one conductor), The present invention can be applied.
- the loop coil that minimizes the signal level of the received signal as the bottom coil.
- the loop coil (electrode) constituting the sensor unit 13 and the auxiliary sensor unit 16 selects a loop coil determined based on the signal level that minimizes the signal level of the reflected signal received from the position indicator 20 as the bottom coil. You may make it do.
- the sensor unit 13 is arranged to be superimposed on the display screen 12 of the LCD, but the position where the sensor unit 13 is arranged is not limited to this.
- the sensor unit 13 may be provided on the lower side of the LCD (the side opposite to the display screen 12).
- the loop coil groups becomes bottom coil 15X in addition to the loop coil X 3, for example, for the loop coil 16A or loop coil 16B of the auxiliary sensor section 16, the signal supplied to the loop coil X 0 may be supplied a signal of opposite phase.
- the selection circuit 106 is provided with a phase inversion circuit to select either a signal supplied from the transmission signal generation circuit 110 or a signal obtained by inverting the phase of the signal supplied from the transmission signal generation circuit 110. Then, it may be configured so that it can be supplied to the loop coils 16A and 16B. As described with reference to FIG. 13, if the winding directions of the loop coils 16A and 16B of the auxiliary sensor unit 16 and the loop coil of the sensor unit 13 are opposite to each other, the selection circuit 106 performs phase inversion. There is no need to provide a circuit.
- the input device including the position indicator 20 and the position detection devices 10N and 10X specifies the peak coil and the bottom coil during the global scan, and based on this, both the peak coil and the bottom coil are specified.
- the signal was transmitted from.
- a global scan that specifies a peak coil and a bottom coil is performed as a test scan at the start of use (for example, when the input device is turned on), and the bottom coil is determined according to the relationship between the peak coil and the bottom coil specified by the test scan. May be specified mechanically. For example, if it is determined by the test scan that the peak coil and the bottom coil are separated from each other by three coils, the bottom coil may be always supplied to a coil separated from the peak coil by three coils.
- the function of the sensor unit in the detection device is realized by the sensor unit 13 of the position detection device 10N.
- the function of the signal supply circuit of the detection device is realized by a portion including the oscillator 111, the current driver 112, the transmission / reception switching circuit 102, and the selection circuit 101 in the detection device 10N, and the oscillator 111 in the detection device 10X.
- a portion including a current driver 112, a sensor switching circuit 103, a transmission / reception switching circuit 102, and a selection circuit 101 is realized.
- the function of the detection circuit of the detection device is realized mainly by the reception signal processing circuit 120 and the processing control unit 130 of the position detection device 10N, and the reception signal processing circuit 120 and the processing control unit 130A of the position detection device 10X.
- the function of the control circuit of the detection device is realized by the processing control unit 130 of the position detection device 10N and the processing control unit 130 of the position detection device 10X.
- phase inversion circuit of the detection device is realized by the phase inversion circuits 1X and 1Y provided in the selection circuit 101 of the position detection devices 10N and 10X.
- the function of the switch circuit of the position detection device is realized by the switch circuits 2X and 2Y provided in the selection circuit 101 of the position detection devices 10N and 10X.
- the functions of the first and second signal generation circuits of the detection device are realized by the phase inversion circuits 1X and 1Y and the switch circuits 2X and 2Y provided in the selection circuit 101 of the position detection devices 10N and 10X.
- the function of the first sensor unit of the detection device is realized by the sensor unit 13 of the position detection device 10X
- the function of the second sensor unit of the detection device is realized by the auxiliary sensor unit 16 of the position detection device 10X. .
- a device including the position indicator 20 and the position detection device 10N is an input device applied to the electronic device 10.
- a device including the position indicator 20 and the position detection device 10X is an input device applied to the electronic apparatus 10A.
- 10 electronic device, 11 ... housing, 11A ... upper housing, 11B ... lower housing, 12 ... display screen, 13 ... sensor unit, 13A ... the pointing input surface, 15X ... loop coil group, X 0 ⁇ X n ... loop coil, 15Y ... loop coil group, Y 0 ⁇ Y m ... loop coils, MB ... motherboard, 10 N ... position detecting device, 101 ... selection circuit, 1X (1), 1X ( 2), ... a phase inversion circuit, 2X (1), 2X (2), ... switch circuit, 1Y (1), 1Y (2), ... phase inversion circuit, 2Y (1), 2Y (2), ... switch circuit, 102 ... transmission / reception switching circuit, 110 ...
- Transmission signal generation circuit 111... Oscillator, 112... Current driver, 120... Reception signal processing circuit, 121... Reception amplifier, 122 .. detection circuit, 123 .. LPF, 124 ... sampling and hold circuit, 125. , 130 ... processing control unit, 14A, 14B ... auxiliary input unit, 16 ... auxiliary sensor unit, 16A, 16B ... loop coil, 103, 104 ... sensor switching circuit, 105 ... transmission / reception switching circuit, 106 ... selection circuit, 130A ... processing Control unit
Abstract
Description
共振回路を有する指示体に対して信号を送信して前記共振回路を共振させると共に、前記位置指示器の前記共振回路から送信される信号を受信して前記指示体を検出する指示体検出装置であって、
前記指示体への前記信号の送信と前記指示体からの信号の受信をするための複数の電極からなるセンサ部と、
前記センサ部に対して第1の信号を供給することで前記電極から磁界を発生させて前記指示体に対して信号を送信し前記指示体の前記共振回路を共振させる信号供給回路と、
前記センサ部を構成する前記複数の電極により受信された、前記指示体の前記共振回路からの信号を検出する検出回路と、を備え、
前記信号供給回路は、前記センサ部の前記指示体からの信号を受信した電極のうち、前記指示体からの信号の信号レベルが最大となる第1の電極へ前記第1の信号を供給するときには、前記受信された信号の信号レベルが最小となる第2の電極に対して、該第2の電極において発生する磁界の向きが前記第1の電極に発生する磁界を強める向きとなるように信号を供給する、
ことを特徴とする。
[電子機器10の構成]
第1の実施の形態の電子機器10の構成について、図1、図2を参照しながら説明する。
次に、電子機器10に搭載された位置検出装置10Nの構成例について、図3を参照しながら説明する。位置検出装置10Nは、センサ部13とセンサコントローラ100とにより構成され、当該位置検出装置10Nと位置指示器20とで電子機器10の入力装置(入力デバイス)が構成されている。センサ部13は、図示を省略したコネクタ部を介して、マザーボードMBに設けられたセンサコントローラ100に接続されている。
次に、位置検出装置10Nで行われる位置指示器20に対して信号を送信するループコイルの選択と、選択されたループコイルを通じて送信する信号とについて、図4を参照しながら説明する。なお、位置検出装置10Nにおいては、ループコイル群15X、15Yのそれぞれで同様の方法を用いて信号を送信するループコイルを選択し、この選択したループコイルを通じて所定の信号を送信するので、ここでは説明を簡単にするため、ループコイル群15Xにおいて、信号を送信するループコイルを選択して、所定の信号を送信する場合を例にして具体的に説明する。
この例の位置検出装置10Nの選択回路101の構成例を、図5を参照しながら説明する。図5に示すように、ループコイル群15Xの各ループコイルX0~Xnのそれぞれには、位相反転回路1X(1)、1X(2)、…と、スイッチ回路2X(1)、2X(2)、…が設けられている。また、ループコイル群15Yの各ループコイルY0~Ymのそれぞれには、位相反転回路1Y(1)、1Y(2)、…と、スイッチ回路2Y(1)、2Y(2)、…が設けられている。
次に、第1の実施の形態の位置検出装置10Nにおいて、処理制御部130の制御に応じて実行される位置指示器20による指示位置の検出処理について、図6のフローチャートを参照しながら説明する。図6は、位置検出装置10Nで実行される指示位置の検出処理を説明するためのフローチャートである。
[電子機器10Aの構成]
第2の実施の形態の電子機器10Aの構成について、図7、図8を参照しながら説明する。
次に、電子機器10Aに搭載された位置検出装置10Xの構成例について、図8を参照しながら説明する。位置検出装置10Xは、センサ部13と補助センサ部16とが、図示を省略したコネクタ部を介して、マザーボードMBに設けられているセンサコントローラ100Aに接続されて構成される。このセンサコントローラ100Aは、位置検出装置10Xの制御回路を構成している。
次に、第2の実施の形態の位置検出装置10Xにおいて、処理制御部130Aの制御に応じて実行される位置指示器20による指示位置の検出処理について、図11、図12のフローチャートを参照しながら説明する。
上述した第1、第2の実施の形態では、ピークコイルには送信信号発生回路110からの信号をそのまま供給し、ボトムコイルには送信信号発生回路110からの信号を位相反転させた信号を供給するようにしたが、ピークコイルから送信される信号とボトムコイルから送信される信号とが打ち消し合うことがないようにして送信することができれば、本発明はこれに限るものではない。例えば、ピークコイルに対してボトムコイルを逆巻きにしておくことで、ボトムコイルに供給する信号を位相反転させることなく位置指示器20に対して十分なエネルギーを供給することができる。
なお、上述した実施の形態において、ループコイル群15Xを構成するループコイルと、ループコイル群15Yを構成するループコイルは、例えば、1ターン(巻回)、2ターン、3ターンのように、電極が巻回されることにより形成されたものである。同様に、補助センサ部16のループコイル16A、16Bもまた、電極が巻回されることにより形成されたものである。これらのループコイルの巻回数は適宜のものとすることができる。また、各センサ部13、16を構成するために用いられる電極は、ループコイルに限るものではない。第2の実施の形態に示すように、位相反転して信号を供給すれば、単一の電極(1本の導線)を複数用いてセンサ部13及び補助センサ部16を構成する場合にも、この発明を適用できる。
なお、検出装置におけるセンサ部の機能は、位置検出装置10Nのセンサ部13が実現している。また、検出装置の信号供給回路の機能は、検出装置10Nにおいては、の発振器111、電流ドライバ112、送受信切替回路102、選択回路101からなる部分が実現し、検出装置10Xにおいては、の発振器111、電流ドライバ112、センサ切替回路103、送受信切替回路102、選択回路101からなる部分が実現している。
Claims (12)
- 共振回路を有する指示体に対して信号を送信して前記共振回路を共振させると共に、前記指示体の前記共振回路から送信される信号を受信して前記指示体を検出する指示体検出装置であって、
前記指示体への前記信号の送信と前記指示体からの信号の受信をするための複数の電極からなるセンサ部と、
前記センサ部に対して第1の信号を供給することで前記電極から磁界を発生させて前記指示体に対して信号を送信し前記指示体の前記共振回路を共振させる信号供給回路と、
前記センサ部を構成する前記複数の電極により受信された、前記指示体の前記共振回路からの信号を検出する検出回路と、を備え、
前記信号供給回路は、前記センサ部の前記指示体からの信号を受信した電極のうち、前記指示体からの信号の信号レベルが最大となる第1の電極へ前記第1の信号を供給するときには、前記受信された信号の信号レベルが最小となる第2の電極に対して、該第2の電極において発生する磁界の向きが前記第1の電極に発生する磁界を強める向きとなるように信号を供給する、
ことを特徴とする検出装置。 - 前記センサ部の前記複数の電極を選択するためのスイッチ回路と、該スイッチ回路を制御して前記センサ部の前記複数の電極と前記信号供給回路と前記検出回路とを制御するための制御回路を更に備える、
ことを特徴とする請求項1に記載の検出装置。 - 前記センサ部を構成する前記複数の電極は、線状導体を巻回して形成したループコイルからなる、
ことを特徴とする請求項2に記載の検出装置。 - 前記制御回路は、前記スイッチ回路を制御して、前記第2の電極に前記第1の信号とは逆位相の第2の信号が供給されるようにした、
ことを特徴とする請求項3に記載の検出装置。 - 前記第1の信号の位相を反転させて前記第2の信号を生成するための位相反転回路を更に備え、
前記制御回路は、前記スイッチ回路を制御して、前記第1の電極には前記第1の信号を供給されるとともに、前記第2の電極には前記第2の信号を供給されるようにした
ことを特徴とする請求項4に記載の検出装置。 - 前記信号供給回路は、前記第1の電極に供給される前記第1の信号を生成するための第1の信号生成回路と、前記第2の電極に供給される前記第2の信号を生成するための第2の信号生成回路からなり、
前記制御回路は、前記検出回路による前記指示体の検出に応じて、前記第2の信号生成回路から前記第2の信号が供給されるように制御する、
ことを特徴とする請求項5に記載の検出装置。 - 前記第2の電極は、前記第1の電極の巻回方向と逆方向となるように巻回されている、
ことを特徴とする請求項4に記載の検出装置。 - 前記複数の電極からなる前記センサ部は、隣接する第1及び第2のセンサからなり、
前記第1の電極は前記第1または第2のセンサのうちのいずれか一方のセンサに含まれるとともに、前記第2の電極は、前記第1または第2のセンサのうちのいずれか他方のセンサに含まれている、
ことを特徴とする請求項5に記載の検出装置。 - 前記制御回路は、前記検出回路により検出された前記指示体からの信号の信号レベルに基づいて、前記第1の電極と前記第2の電極とを特定するようにした、
ことを特徴とする請求項2に記載の検出装置。 - 表示領域を有する表示部を更に備え、
前記第1のセンサが前記表示部の前記表示領域に重畳して配置されている、
ことを特徴とする請求項9に記載の検出装置。 - 指示体と検出装置とからなる入力装置であって、
前記指示体は、前記検出装置からの信号を受信するとともに、前記検出装置からの前記信号に応じた信号を送信するためのコイルとコンデンサとからなる共振回路を備え、
前記検出装置は、
前記指示体への前記信号の送信と、前記指示体からの信号を受信するための複数の電極からなるセンサ部と、
前記センサ部に対して第1の信号を供給することで前記電極から磁界を発生させて前記指示体に信号を供給するための信号供給回路と、
前記センサ部を構成する前記複数の電極により受信された、前記指示体からの信号を検出する検出回路と、を備え、
前記信号供給回路は、前記センサ部の前記指示体からの信号を受信した電極のうち、前記信号の信号レベルが最大となる第1の電極へ前記第1の信号を供給するときには、前記受信された信号の信号レベルが最小となる第2の電極に対しては、該第2の電極において発生する磁界の向きが前記第1の電極に発生する磁界を強める向きとなるように信号を供給する、
ことを特徴とする入力装置。 - 共振回路を有する指示体に対して信号を送信して前記共振回路を共振させると共に、前記指示体の前記共振回路から送信される信号を受信する複数の電極からなるセンサ部により前記指示体を検出する検出装置における検出方法であって、
前記センサ部を構成する前記複数の電極に対して第1の信号を供給する工程と、
前記指示体からの信号を受信した前記センサ部を構成する前記複数の電極のうち、前記受信された信号の信号レベルが最大となる第1の電極には前記第1の信号を供給して磁界を発生させるとともに、前記受信した信号の信号レベルが最小となる第2の電極には前記第1の電極に発生した磁界を強める向きに磁界が発生するように信号を供給する工程と、
を有することを特徴とする検出方法。
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