JP2014217081A - Electronic apparatus and noncontact power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a user-friendly electronic apparatus in which one sensor serves as a foreign matter sensor and a touch sensor capable of solving a problem such as heat generation due to a foreign matter existing between a power supply device and the electronic apparatus without increasing a manufacturing cost.SOLUTION: An electronic apparatus 3, which is placed on a placement plane 11 of a power supply device 2 to be supplied with the power transmitted from the power supply device 2 in a noncontact manner, includes: a housing 31; a display panel 6 disposed at the front side of the housing; a power receiving coil 32 disposed in the housing; and a first electrode and a second electrode. The housing includes: an electrode sheet 33 disposed along the rear face which faces the placement plane; and a detection control section that controls to detect a foreign matter existing on the rear face on the basis of a response signal output from the second electrode in response to a drive signal applied to the first electrode and to detect an item pointed by a touch operation made by a user on the rear face.

Description

  The present invention includes an electronic device that is mounted on a mounting surface of a power feeding device and performs power transmission without contact from the power feeding device, and a mounting surface on which the electronic device is mounted. The present invention relates to a non-contact power feeding apparatus that performs non-contact power transmission to a placed electronic device.

  In an electronic device equipped with a secondary battery such as a mobile phone, in order to charge the secondary battery, the electronic device and the power supply device are electrically connected via respective terminals, and the charger is connected to the electronic device. In general, power is supplied, but the power feeding device and the electronic device are provided with coils for power transmission and power reception, respectively, and the power feeding device and the electronic device are contactless (wireless) by the electromagnetic induction method. A technique for performing power transmission is known (see Patent Documents 1 to 3). According to this, since the terminal for electrical connection is not exposed, it is easy to ensure waterproofness, it is not necessary to consider the problem of poor contact and deterioration, and the power supply device and the electronic device are attached and detached. It is possible to obtain advantages such as being easily performed.

  In such a power supply device that performs power transmission without contact with an electronic device, a mounting surface on which the electronic device is mounted is formed on the upper surface of the power supply device, and the user mounts the electronic device on the mounting surface. If power supply is enabled just by doing this, it will be convenient for the user, but foreign objects other than electronic devices may be placed on the mounting surface. For example, various foreign substances such as staples and eraser scraps can be considered.For example, if the foreign substance is a conductor such as metal, an eddy current is generated in the foreign substance by the magnetic field generated by the power transmission coil. There is a risk that the foreign material generates heat. Further, if the foreign matter is an insulator such as a resin, there is no fear of heat generation, but the presence of the foreign matter may increase the interval between the power transmission coil and the power reception coil, which may reduce power transmission efficiency.

  In view of this, a technology of a foreign matter sensor that detects foreign matter existing between a power feeding device and an electronic device is known (see Patent Document 4). In this technique, a voltage is applied between the positive electrode and the negative electrode, and a foreign object made of a conductor such as a metal based on the amount of change in parameters (impedance, current and voltage) between the positive electrode and the negative electrode. Is to be detected.

JP 2006-42519 A JP 2010-16235 A JP 2008-172873 A JP 2012-90374 A

  As described above, the foreign matter sensor for detecting the foreign matter requires a control circuit in addition to the electrodes, which increases the manufacturing cost. This foreign matter sensor and the touch sensor for detecting a touch operation performed by the user are included. Can be shared by a single sensor, it is possible to compensate the increase in manufacturing cost related to foreign object detection and provide the user with extra convenience.

  The present invention has been devised on the basis of such inventor's knowledge, and its main purpose is to combine the foreign matter sensor and the touch sensor with one sensor without increasing the manufacturing cost. An object of the present invention is to provide an electronic device and a non-contact power supply device that are configured to eliminate problems such as heat generation due to foreign matter interposed between the power supply device and the electronic device and to improve user convenience.

  An electronic device of the present invention is an electronic device that is placed on a placement surface of a power feeding device and performs power transmission in a non-contact manner from the power feeding device, and is disposed on a housing and a front side of the housing. A display panel, a power receiving coil disposed in the housing, a first electrode and a second electrode, a sensor unit disposed in the housing, and a drive signal applied to the first electrode. Based on the response signal output from the second electrode, a detection control unit that detects a foreign object existing on the back side facing the placement surface and detects an indicator that the user performs a touch operation on the back side It is set as the structure provided with these.

  The non-contact power feeding device of the present invention is a non-contact power feeding device that has a mounting surface on which an electronic device is placed, and performs power transmission in a non-contact manner to the electronic device. A power transmission coil disposed in the body, a first electrode and a second electrode, a sensor unit disposed in the housing along a surface facing the electronic device, and a drive applied to the first electrode Based on a response signal output from the second electrode in response to a signal, a foreign object detection process for detecting a foreign object existing on a surface facing the electronic device, and a user touching the surface facing the electronic device A detection control unit that performs a touch detection process for detecting an instruction to perform an operation, wherein the sensor unit is formed wider than a surface of the electronic device that faces the power supply device, and the detection control unit includes the sensor Of the area where the part is placed Chi, the electronic device performs the foreign object detection processing in the mounting region to be placed, and configured to perform the touch detection processing in the region except for the pre-described depositing area.

  According to the present invention, since the foreign matter sensor and the touch sensor are shared by one sensor unit, problems such as heat generation due to the foreign matter interposed between the power feeding device and the electronic device are eliminated without increasing the manufacturing cost. At the same time, the convenience of the user can be enhanced.

The perspective view of the electric power feeder 2 and the electronic device 3 which comprise the non-contact electric power transmission system 1 which concerns on 1st Embodiment. Cross-sectional view of power supply device 2 and electronic device 3 Cross section of electrode sheet 33 Schematic configuration diagram of main parts related to control of the power feeding device 2 and the electronic device 3 Schematic configuration diagram of the foreign object / touch detection control unit 92 Schematic configuration diagram of the received signal processing unit 104 Waveform diagram showing signals output from each part of received signal processing section 104 Explanatory drawing explaining the principle of the foreign material detection in the foreign material detection process performed by the foreign material / touch detection control unit 92 Explanatory drawing explaining the principle of the foreign material detection in the foreign material detection process performed by the foreign material / touch detection control unit 92 Explanatory drawing explaining the point of foreign object detection Explanatory drawing explaining the point of foreign object detection Explanatory drawing explaining the principle of the touch detection in the touch detection process performed in the foreign material / touch detection control unit 92 Flow chart showing the procedure of foreign object / touch detection processing performed by the foreign object / touch detection control unit 92 Explanatory drawing explaining the situation where a ghost point generate | occur | produces in multi-touch operation in the foreign material and touch detection part 91 The top view which shows the modification of the transmission electrode 41 and the reception electrode 42 Front view, rear view, and development view showing electrode sheet 131 provided in electronic device 3 according to the second embodiment The front view, back view, and expanded view which show the electrode sheet 141 which concerns on the modification of 2nd Embodiment. Sectional drawing of the electric power feeder 2 and the electronic device 3 which concern on 3rd Embodiment The top view which shows the state which mounted the electronic device 3 in the electric power feeder 2 which concerns on 3rd Embodiment. The schematic block diagram of the principal part which concerns on control of the electric power feeder 2 which concerns on 3rd Embodiment, and the electronic device 3

  A first invention made to solve the above-described problem is an electronic device that is placed on a placement surface of a power feeding device and performs power transmission in a non-contact manner from the power feeding device. A display panel disposed on the front surface side of the housing, a power receiving coil disposed in the housing, a first electrode and a second electrode, a sensor unit disposed in the housing, and the first electrode On the basis of a response signal output from the second electrode in response to a drive signal applied to the sensor, foreign matter existing on the back side facing the mounting surface is detected, and a user performs a touch operation on the back side. And a detection control unit that detects an indicator.

  According to this, the foreign matter adhering to the back surface of the electronic device can be detected with high sensitivity. In addition, since the back of the electronic device is a touch surface on which a touch operation is performed by an instruction such as a user's finger, the user can perform a screen operation on the display panel by performing the touch operation here, User convenience can be improved.

  Moreover, 2nd invention is set as the structure with which the said sensor part was provided along the said back surface in the said housing | casing.

  According to this, since the sensor unit is provided along the rear surface of the housing, the distance between the foreign object adhering to the rear surface or an indicator such as a user's finger and the sensor unit is constant, so the detection accuracy is improved. To do.

  According to a third aspect of the invention, the detection control unit discriminates a foreign object and an indicator based on a change in capacitance appearing in detection data based on the response signal, and the detection data has an initial capacitance. When it indicates that the value is larger than the value, it is determined that a foreign substance is present, and when the detection data indicates that the capacitance is smaller than the initial value, it is determined that an indicator is present. The configuration.

  According to this, it is possible to accurately discriminate between a foreign object and an indicator.

  According to a fourth aspect of the present invention, the detection control unit does not detect a foreign object when a plurality of instructions that perform a touch operation are detected at the same time.

  According to this, it is possible to avoid erroneous detection of foreign matters due to ghost points.

  According to a fifth aspect of the invention, the detection control unit integrates a signal based on the response signal from the second electrode, and resets the integration value to zero when the integration value by the integration processing reaches a predetermined threshold value. It is set as the structure which has an integration part to perform.

  According to this, since the amount of change in the detection amount that changes according to the foreign object and the touch operation is increased, the detection sensitivity of the foreign object can be improved.

  According to a sixth aspect of the present invention, the detection control unit includes an integration unit that integrates a signal based on the response signal from the second electrode, and a front stage of the integration unit. A clamp unit that holds a signal based on the response signal at a predetermined value or more.

  According to this, since the amount of change in the detection amount that changes according to the foreign object and the touch operation is increased, the detection sensitivity of the foreign object can be improved.

  In a seventh aspect of the present invention, the first electrode has a widened portion at a position between two adjacent second electrodes, and the second electrode includes two adjacent first electrodes. It is set as the structure which has a wide part in the position between.

  According to this, since the amount of change in the detection amount that changes according to the foreign object and the touch operation is increased, the detection sensitivity of the foreign object can be improved.

  Moreover, 8th invention is set as the structure by which the said wide part is formed in mesh shape.

  According to this, it can suppress that the efficiency of electric power transmission falls because a 1st electrode and a 2nd electrode exist between a power transmission coil and a receiving coil.

  According to a ninth aspect of the present invention, the sensor unit includes a front sensor unit disposed on the front side of the casing, and a rear sensor unit disposed on the rear side of the casing, and the front sensor unit And the back sensor unit is composed of one electrode sheet in which the first electrode and the second electrode are formed on a foldable base sheet, and the front sensor unit is formed by bending the electrode sheet. The rear sensor unit is formed in a form positioned on the front side and the back side of the housing, respectively.

  According to this, the front sensor unit can be configured as a touch panel display by being overlapped with the display panel, and the back sensor unit can be configured as a sensor for both foreign object detection and touch detection. Convenience can be improved. And since a front sensor part and a back sensor part can be manufactured from one base-material sheet | seat, manufacturing cost can be reduced.

  In a tenth aspect of the present invention, the sensor unit further includes a side sensor unit disposed on a side surface side of the housing, and the side sensor unit can be bent together with the front sensor unit and the back sensor unit. It is composed of one electrode sheet in which the first electrode and the second electrode are formed on one base sheet, and the side sensor part is positioned on the side surface side of the casing by bending the electrode sheet. It is set as the structure formed in a form.

  According to this, since the side sensor part is provided in addition to the front sensor part and the back sensor part, the convenience for the user can be further enhanced.

  In an eleventh aspect of the invention, the electrode sheet includes a front surface portion disposed on the front surface side of the housing, a first back surface portion and a second back surface portion disposed on the back surface side of the housing, and the housing. A first side surface portion and a second side surface portion disposed on a side surface side of the body, wherein the first electrode and the second electrode are provided on both front and back surfaces of the base sheet, and the front surface portion is the A front sensor unit is configured, and the first back unit and the second back unit overlap each other to configure the back sensor unit.

  According to this, since the front sensor unit and the back sensor unit can be used as the transmitter and the receiver, the manufacturing cost can be reduced.

  A twelfth aspect of the present invention is a non-contact power feeding device that has a mounting surface on which an electronic device is mounted and performs power transmission to the electronic device in a non-contact manner, and the housing and the housing are arranged in the housing A power transmission coil, a first electrode and a second electrode, and a sensor unit disposed in the casing along a surface facing the electronic device, and responding to a drive signal applied to the first electrode Then, based on the response signal output from the second electrode, a foreign object detection process for detecting a foreign object existing on the surface facing the electronic device, and the user performs a touch operation on the surface facing the electronic device A detection control unit that performs a touch detection process for detecting an indicator, wherein the sensor unit is formed wider than a surface of the electronic device that faces the power supply device, and the sensor unit is disposed in the detection control unit. Out of the area It performs the foreign object detection processing in the mounting region of the child device is placed, and configured to perform the touch detection processing in the region except for the pre-described depositing area.

  According to this, since the electronic device is formed in a curved surface shape, a gap is generated between the mounting surface of the power feeding device and the electronic device, so that the foreign matter attached to the mounting surface of the power feeding device is electronic. Even when the sensitivity of foreign object detection on the device side decreases, foreign object detection can be performed with high sensitivity on the power feeding device side. Furthermore, since the electronic device can be operated by a touch operation on the power supply apparatus, user convenience can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view of a power feeding device 2 and an electronic device 3 constituting a non-contact power transmission system 1 according to the present embodiment. In this non-contact power transmission system, power transmission is performed from the power feeding device 2 to the electronic device 3 in a non-contact (wireless) manner by placing the electronic device 3 on the placement surface 11 provided in the power feeding device 2. .

  Here, the electronic device 3 is a mobile phone such as a smartphone, a tablet terminal, a personal computer, or the like, and FIG. 1 shows an example of a smartphone. The electronic device 3 includes a display panel 6 and an operation unit 7 on the front side of the housing 31. The display panel 6 is composed of a liquid crystal display panel or the like. In the operation unit 7, operation buttons and the like are arranged. The electronic device 3 is placed on the placement surface 11 of the power feeding device 2 with the back side facing down.

  Next, configurations of the power feeding device 2 and the electronic device 3 illustrated in FIG. 1 will be described. FIG. 2 is a cross-sectional view of the power feeding device 2 and the electronic device 3.

  The power feeding device 2 includes a housing 12 and a power transmission coil 13. The power transmission coil 13 performs power transmission by electromagnetic induction and is disposed in the housing 12. In addition to the power transmission coil 13, a substrate that constitutes drive control means (such as the power transmission control unit 52 and the power transmission circuit unit 53 shown in FIG. 4) is disposed in the housing 12.

  The power transmission coil 13 is formed by winding a collective electric wire in which a plurality of insulated electric wires obtained by coating a linear conductor with an insulating layer are wound in a substantially circular spiral shape. A magnetic sheet 14 is provided on the side of the power transmission coil 13 opposite to the placement surface 11 so as to cover the entire surface of the power transmission coil 13.

  The electronic device 3 includes a housing 31, a power receiving coil 32, an electrode sheet (sensor unit) 33, and a display panel 6 (see FIG. 1). The power receiving coil 32 performs power transmission by electromagnetic induction and is disposed in the housing 31. The electrode sheet 33 is disposed along a facing surface 34 that faces the mounting surface 11 of the power feeding device 2 in the housing 31.

  Similarly to the power transmission coil 13, the power reception coil 32 is formed by winding a collective electric wire in which a plurality of insulated electric wires each having a linear conductor covered with an insulating layer are wound in a substantially circular spiral shape. A magnetic sheet 35 is provided on the side of the power receiving coil 32 opposite to the facing surface 34 so as to cover the entire surface of the power receiving coil 32.

  In this non-contact power transmission system, when AC power is supplied to the power transmission coil 13 of the power supply device 2, the power transmission coil 13 is magnetically coupled to the power reception coil 32 of the electronic device 3, and an AC voltage is induced in the power reception coil 32. Thus, AC power is transmitted from the power transmission coil 13 to the power reception coil 32.

  The electrode sheet 33 is used for both foreign object detection and touch detection. The electrode sheet 33 is disposed along the facing surface 34 on the back surface side of the housing 31 to detect the foreign material existing on the facing surface 34 side. In 34, an indicator F (such as a finger) F on which the user performs a touch operation is detected.

  The electrode sheet 33 can detect foreign matter interposed between the power transmission coil 13 of the power supply device 2 and the power reception coil 32 of the electronic device 3. That is, the electrode sheet 33 can detect the foreign matter E1 attached to the facing surface 34 of the electronic device 3, and when the electronic device 3 is placed on the power supply device 2, the foreign matter attached to the placement surface 11 of the power supply device 2. E2 can also be detected by the electrode sheet 33.

  Further, the facing surface 34 functions as a touch surface on which a user performs a touch operation. Here, the user can operate the electronic device 3 by performing a touch operation with an indicator (such as a finger) F, for example, a display panel. 6 can be performed, that is, an operation for selecting an icon on the screen.

  Next, the electrode sheet 33 shown in FIG. 2 will be described. FIG. 3 is a cross-sectional view of the electrode sheet 33.

  The electrode sheet 33 is configured such that a transmission electrode (first electrode) 41 and a reception electrode (second electrode) 42 extending in two directions orthogonal to each other intersect in a lattice shape (see FIG. 5). . A plurality of transmission electrodes 41 and a plurality of reception electrodes 42 are provided, the transmission electrodes 41 are arranged in parallel with each other at a predetermined interval, and the reception electrodes 42 are also arranged in parallel with each other at a predetermined interval. The electrode sheet 33 is disposed along a back wall portion 31 a in which a facing surface 34 facing the power feeding device 2 is formed in the housing 31, the transmitting electrode 41 is disposed on the facing surface 34 side, and the receiving electrode 42. Is disposed on the side opposite to the facing surface 34 via the base sheet (insulating layer) 43.

  In particular, in this embodiment, the electrode sheet 33 is formed by bonding the transmission electrode sheet 44 on which the transmission electrode 41 is formed and the reception electrode sheet 45 on which the reception electrode 42 is formed on each of the front and back surfaces of the base sheet 43. It has an integrated configuration. In addition to this, as the configuration of the electrode sheet 17, for example, the transmission electrode 41 and the reception electrode 42 may be directly formed on both surfaces of the base material sheet 43, and the electrode formation surface may be covered with an insulating material.

  Next, control performed by the power feeding device 2 and the electronic device 3 illustrated in FIG. 1 will be described.

  FIG. 4 is a schematic configuration diagram of a main part related to the control of the power supply device 2 and the electronic device 3 constituting the non-contact power transmission system 1 according to the present embodiment. In this non-contact power transmission system, the electronic device 3 includes a secondary battery 69 that supplies power for operating a mounted component (not shown), and the secondary battery 69 is charged by the power sent from the power supply device 2. Done.

  The power feeding device 2 includes an AC / DC converter 51, a power transmission control unit 52, and a power transmission circuit unit 53. The AC / DC converter 51 converts AC power supplied from a power source (commercial power source) 8 into DC power. The power transmission control unit 52 controls the operation of the power transmission circuit unit 53. The power transmission circuit unit 53 converts the DC power sent from the AC / DC converter 51 via the power transmission control unit 52 into an AC voltage having a predetermined frequency and supplies the AC voltage to the power transmission coil 13.

  The power transmission control unit 52 includes a control circuit 54, a voltage monitoring unit 55, and a temperature monitoring unit 56. The control circuit 54 controls the operation of the power transmission circuit unit 53. The voltage monitoring unit 55 monitors the voltage of AC power supplied from the power transmission circuit unit 53 to the power transmission coil 13. The temperature monitoring unit 56 monitors the temperature of the power transmission coil 13. When the voltage monitoring unit 55 and the temperature monitoring unit 56 detect an abnormality in voltage and temperature, power supply to the power transmission coil 13 is stopped.

  The power transmission circuit unit 53 includes a driver 57 and a resonance circuit 58. The driver 57 converts DC power sent from the AC / DC converter 51 via the power transmission control unit 52 into AC voltage having a predetermined frequency. The resonance circuit 58 forms a resonance circuit with an internal capacitor and the power transmission coil 13, and oscillates the power transmission coil 13 at a predetermined resonance frequency in accordance with the AC voltage applied from the driver 57.

  The electronic device 3 includes a main control unit 37 and a display control unit 38. The main control part 37 controls each part collectively. The display control unit 38 controls the display operation of the display panel 6.

  Further, the electronic device 3 includes a power reception circuit unit 61, a power reception control unit 62, and a charge control circuit 63. The power receiving circuit unit 61 converts the alternating current induced in the power receiving coil 32 by electromagnetic induction with the power transmitting coil 13 of the power feeding device 2 into DC power having a predetermined voltage. The power reception control unit 62 controls the operation of the power reception circuit unit 61. The charging control circuit 63 supplies the secondary battery 69 with the power transmitted from the power receiving circuit unit 61 via the power receiving control unit 62 to charge the secondary battery 69.

  The power receiving circuit unit 61 includes a rectifier circuit 64 and a regulator 65. The rectifier circuit 64 converts AC power induced in the power receiving coil 32 into DC power. The regulator 65 converts the DC power sent from the rectifier circuit 64 into a predetermined voltage suitable for charging the secondary battery 69.

  The power reception control unit 62 includes a control circuit 66 and a voltage monitoring unit 67. The control circuit 66 controls the operation of the power receiving circuit unit 61. The control circuit 66 controls the operation of the power receiving circuit unit 61. The voltage monitoring unit 67 monitors the voltage of the AC power induced in the power receiving coil 32. In addition, the power reception control unit 62 monitors the state of the device mounted on the electronic device 3, for example, the temperature of the power receiving coil 32, the charging state of the secondary battery 69, etc. To stop.

  In the present embodiment, the power supply apparatus 2 is provided with an electronic device detection unit 71 that detects that the electronic device 3 is placed on the placement surface 11. Based on the detection result of the electronic device detection unit 71, the power transmission operation of the power supply apparatus 2 is controlled. That is, when the electronic device 3 is placed on the placement surface 11, supply of AC power to the power transmission coil 13 is started, and when the electronic device 3 is separated from the power feeding device 2, supply of AC power to the power transmission coil 13 is started. To stop.

  In the electronic device detection unit 71, fluctuations in the voltage value (or current value) generated in the power transmission coil 13 due to the load impedance changing as the power receiving coil 32 of the electronic device 3 approaches the power transmission coil 13 of the power feeding device 2. Based on this, it is detected that the electronic device 3 is placed on the placement surface 11. At this time, by comparing the fluctuation amount of the voltage value (or current value) of the power transmission coil 13 with a preset threshold value, it is determined whether or not the electronic device 3 is placed on the placement surface 11. Good.

  In the present embodiment, the electronic device 3 is also provided with a power feeding device detection unit 81 that detects that the electronic device 3 is placed on the placement surface 11 of the power feeding device 2. Based on the detection result of the power supply device detection unit 81, the power receiving operation of the electronic device 3 is controlled.

  In the power feeding device detection unit 81, the fluctuation of the voltage value (or current value) generated in the power receiving coil 32 due to the load impedance changing due to the power receiving coil 32 of the electronic device 3 approaching the power transmitting coil 13 of the power feeding device 2. Based on this, it is detected that the electronic device 3 is placed on the placement surface 11. At this time, by comparing the fluctuation amount of the voltage value (or current value) of the power receiving coil 32 with a preset threshold value, it is determined whether or not the electronic device 3 is placed on the placement surface 11. Good.

  Further, in the present embodiment, the power feeding device 2 and the electronic device 3 are each provided with the information transmitting / receiving units 72 and 82, and required power is transmitted between the power feeding device 2 and the electronic device 3 via the power transmission coil 13 and the power receiving coil 32. Information transmission for transmitting and receiving information can be performed. Note that this information transmission may be simple bit communication or coded communication.

  The information transmission / reception units 72 and 82 of the power supply device 2 and the electronic device 3 have modulation / demodulation circuits 73 and 83 that perform modulation / demodulation of signals including information, respectively. In the modulation / demodulation circuits 73 and 83, the modulation signals generated by the transmission / reception modulation circuits 73 and 83 are sent to the transmission destination via the power transmission coil 13 and the power reception coil 32, and at the transmission destination, the power transmission coil 13 or the power reception coil 32. The modulation signal extracted from the output of the signal is demodulated by the modem circuits 73 and 83 to obtain transmission information.

  Here, when information is transmitted from the power supply apparatus 2 to the electronic device 3, the modulation signal output from the information transmission / reception unit 72 is superimposed on the AC signal for power transmission by the power transmission circuit unit 53, thereby simultaneously transmitting information. You can send. Further, information transmission may be performed when power transmission is not performed. The power receiving circuit unit 61 of the electronic device 3 includes an information transmission driver and a resonance circuit (not shown), and drives these to transmit a modulation signal output from the information transmitting / receiving unit 82 toward the power feeding device 2. To do.

  Here, the information exchanged between the power supply device 2 and the electronic device 3 is state information regarding the states of the power supply device 2 and the electronic device 3. As the state information, for example, during charging of the secondary battery 69, information on the charging state of the secondary battery 69 is transmitted from the electronic device 3 to the power supply device 2, and power transmission is continued when the secondary battery 69 needs to be charged. When the charging of the secondary battery 69 is completed, the power transmission is stopped. In addition, information such as temperature and voltage is exchanged between the power supply device 2 and the electronic device 3 as state information, and control is performed to stop power transmission even when the state information indicates an abnormality.

  In the present embodiment, the power supply device 2 and the electronic device 3 include authentication units 74 and 84, respectively, and mutual authentication is performed between the power supply device 2 and the electronic device 3. In the power supply device 2 and the electronic device 3, authentication information such as identification information of the power supply device 2 and the electronic device 3 used for mutual authentication is exchanged by the information transmitting / receiving units 72 and 82 provided in each, and based on this authentication information Authentication units 74 and 84 authenticate each other.

  This mutual authentication is performed when power transmission from the power supply apparatus 2 to the electronic device 3 is started. That is, when the power feeding device 2 and the electronic device 3 detect that the electronic device 3 is placed on the placement surface 11 of the power feeding device 2, identification information is exchanged between the power feeding device 2 and the electronic device 3. , Mutually authenticate the other party. When this mutual authentication is successful, power transmission from the power supply apparatus 2 to the electronic device 3 is started. When mutual authentication fails, power transmission is not performed.

  In the present embodiment, the electronic device 3 detects a foreign object existing on the facing surface 34 (see FIG. 2) side, and also detects an indicator F (such as a finger) F on which the user performs a touch operation on the facing surface 34. A foreign object / touch detection unit 91 is provided. Hereinafter, the foreign object / touch detection process performed by the foreign object / touch detection unit 91 will be described in detail.

  Examples of foreign substances include those composed mainly of metal (conductor) such as staples and clips of staplers, and those composed mainly of resin (insulator) such as eraser scraps of eraser. It is. When such foreign matter is interposed between the mounting surface 11 of the power feeding device 2 and the facing surface 34 of the electronic device 3, when the foreign matter is made of a conductor such as metal, an eddy current is generated and so-called induction heating ( IH) may cause heat generation, and if the foreign material is made of an insulator such as resin, there is no risk of heat generation, but power transmission by electromagnetic induction is highly dependent on distance, so foreign material should intervene. The transmission efficiency may decrease.

  Therefore, in the present embodiment, it is detected that a foreign matter made of a conductor such as a metal or a foreign matter made of an insulator such as a resin exists between the placement surface 11 of the power feeding device 2 and the facing surface 34 of the electronic device 3. For this reason, a foreign object / touch detection unit 91 is provided.

  The foreign object / touch detection unit 91 includes an electrode sheet 33 (see FIG. 2) and a foreign object / touch detection control unit 92, and outputs from the receiving electrode 42 (see FIG. 4) provided on the electrode sheet 33. When the foreign object / touch detection control unit 92 detects the presence of a foreign object based on the signal, the foreign object / touch detection control unit 92 outputs foreign object detection information to the main control unit 37. Then, the display control unit 38 is controlled to display on the display panel 6 a display screen indicating that there is a foreign object, informing the user of the presence of the foreign object and prompting the user to remove the foreign object.

  The display panel 6 is composed of a liquid crystal display panel or the like, and can display a character, an icon, or the like to notify the user, but other than this, for example, an LED or the like may be lit.

  The foreign object / touch detection control unit 92 performs the foreign object detection process when the power supply device detection unit 81 detects that the electronic device 3 is placed on the power supply device 2, and the presence of the foreign material is present here. Is not detected, the power reception control unit 62 starts a power reception operation. On the other hand, when the foreign object / touch detection control unit 92 detects the presence of the foreign object, the display panel 6 is used to notify the user of the presence of the foreign object, and the power reception operation by the power reception control unit 62 is suspended. The power transmission device 2 is notified and execution of power transmission in the power transmission control unit 52 is suspended.

  It should be noted that foreign matter detection may be performed even when the electronic device 3 is not placed on the power supply device 2. In this case, the foreign matter detection is performed periodically after a predetermined time in order to reduce power consumption. Good.

  Moreover, in this embodiment, the opposing surface 34 (back surface) side of the electronic device 3 functions as a touch panel. That is, the electrode sheet 33 is disposed along the facing surface 34, and the facing surface 34 becomes a touch surface on which a touch operation with an indicator (such as a finger) is performed. The foreign object / touch detection control unit 92 performs processing for detecting an instruction that the user performs a touch operation on the facing surface 34, and the main control unit 37 displays the detection result regarding the touch position in the foreign object / touch detection control unit 92. Based on this, processing relating to the screen operation of the display panel 6 is performed. Accordingly, when the user performs a touch operation on the facing surface 34, an operation on the screen displayed on the display panel 6, for example, an operation for selecting an icon on the screen can be performed.

  Next, the foreign object / touch detection control unit 92 shown in FIG. 4 will be described. FIG. 5 is a schematic configuration diagram of the foreign object / touch detection control unit 92.

  The foreign object / touch detection control unit 92 includes a transmission unit 93, a reception unit 94, a drive control unit 95, a foreign object / touch determination unit 96, a foreign object determination unit 97, and a touch position calculation unit 98. .

  The transmission unit 93 applies a drive signal to the transmission electrode 41. The receiving unit 94 receives the response signal of the receiving electrode 42 in response to the drive signal applied to the transmitting electrode 41, and outputs a detection value (level signal) for each electrode intersection where the transmitting electrode 41 and the receiving electrode 42 intersect. Output. The drive control unit 95 controls the operation of the transmission unit 93 and the reception unit 94 and generates detection data corresponding to the capacitance of each electrode intersection based on the detection value output from the reception unit 94. is there.

  The foreign object / touch determination unit 96 performs processing for determining a foreign object and a touch operation based on detection data output from the drive control unit 95. When the foreign object / touch determination unit 96 determines that the foreign object is detected as a foreign object, the foreign object determination unit 97 determines whether or not the foreign object exists by comparing the detection data of each electrode intersection with a threshold value. If the determination result that the image is present is obtained, the display panel 6 is used to notify the user of the presence of the foreign object. The touch position calculation unit 98 performs a touch position calculation process based on the detection data output from the drive control unit 95, and outputs touch position information.

  The transmission unit 93 includes a transmission electrode selection unit 101 and a transmission pulse generation unit 102. In the transmission electrode selection unit 101, a plurality of transmission electrodes 41 are selected one by one, and the selected transmission electrode is selected here. 41, the drive signal (pulse signal) generated by the transmission pulse generator 102 is sequentially applied. The reception unit 94 includes a reception electrode selection unit 103 and a reception signal processing unit 104. In the reception electrode selection unit 103, a plurality of reception electrodes 42 are selected one by one, and the reception electrodes selected here are selected. Response signals from 42 are sequentially input to the received signal processing unit 104.

  The touch position calculation unit 98 obtains the touch position (center coordinates of the touch area) from the detection data of each electrode intersection output from the drive control unit 95 by a predetermined calculation process. In the calculation of the touch position, a required value is obtained from detection data for each of a plurality of (for example, 4 × 4) electrode intersections adjacent in the X direction (the arrangement direction of the reception electrodes 42) and the Y direction (the arrangement direction of the transmission electrodes 41). The touch position is obtained using an interpolation method (for example, a center of gravity method). Thereby, the touch position can be detected with a resolution (for example, 1 mm or less) higher than the arrangement pitch (for example, 5 mm) of the transmission electrode 41 and the reception electrode 42.

  Next, reception signal processing performed by the reception signal processing unit 104 shown in FIG. 5 will be described. FIG. 6 is a schematic configuration diagram of the reception signal processing unit 104.

  The reception signal processing unit 104 includes an IV conversion unit 111, a band pass filter 112, an absolute value detection unit 113, a clamp unit 114, an integration unit 115, a sample hold unit 116, an AD conversion unit 117, and a monitoring unit. 118.

  In the IV conversion unit 111, the response signal (charge / discharge current signal) of the reception electrode 42 input via the reception electrode selection unit 103 is converted into a voltage signal. In the band pass filter 112, a process for removing a signal having a frequency component other than the frequency of the drive signal applied to the transmission electrode 41 is performed on the output signal of the IV conversion unit 111. The absolute value detection unit (rectification unit) 113 performs full-wave rectification on the output signal of the bandpass filter 112. The clamp unit 114 performs a process of holding the output voltage at a predetermined voltage or higher with respect to the output signal of the absolute value detection unit 113. The integration unit 115 performs processing for integrating the output signal of the clamp unit 114 in the time axis direction. In the sample hold unit 116, processing for sampling the output signal of the integration unit 115 at a predetermined timing is performed. The AD converter 117 AD-converts the output signal of the sample hold unit 116 and outputs a detection amount for each electrode intersection.

  The monitoring unit 118 monitors the integration value of the integration unit 115, compares the integration value with a predetermined threshold value, and outputs a reset signal when the integration value reaches the threshold value. The monitoring unit 118 is specifically composed of a comparator, and generates a reset pulse when the output voltage of the integrating unit 115 reaches a predetermined voltage.

  FIG. 7 is a waveform diagram showing signals output from each unit of the reception signal processing unit 104 shown in FIG. When a drive signal (pulse signal) is applied to the transmission electrode 41 a predetermined number of times, a charge / discharge current corresponding to the rise and fall of the pulse wave flows to the reception electrode 42, and a voltage signal output from the IV converter 111 in response thereto Changes.

  The output signal of the IV conversion unit 111 converges as the application of the drive signal to the transmission electrode 41 is completed, and the integration unit performs the integration by the sample hold unit 116 at a predetermined timing when the output signal of the IV conversion unit 111 converges. 115 output signals are sampled. In the integration unit 115, the integration value is reset to zero according to the reset signal output from the monitoring unit 118, and the integration process and the reset are repeated.

  Here, if there is a foreign substance on the facing surface 34 side, the amplitude of the voltage signal output from the IV conversion unit 111 increases as the capacitance at the electrode intersection increases, and in accordance with this, the absolute value The voltage of the output signal of the detection unit 113 increases. For this reason, when there is a foreign object on the facing surface 34 side, the time until the integrated value of the integrating unit 115 reaches the threshold is shortened and the reset timing is earlier than when there is no foreign object. .

  On the other hand, when the user performs a touch operation on the facing surface 34 with an indicator (such as a finger), the amplitude of the voltage signal output from the IV conversion unit 111 decreases as the capacitance at the electrode intersection decreases. Accordingly, the voltage of the output signal of the absolute value detection unit 113 is lowered accordingly. For this reason, when the touch operation is performed on the facing surface 34, the time until the integration value of the integration unit 115 reaches the threshold value is longer than when the touch operation is not performed, and the reset is performed. Will be delayed.

  In the AD conversion unit 117, the output signal of the integration unit 115 is sampled at a predetermined timing by the sample hold unit 116, and the output voltage signal is converted into an output value (AD conversion value) of a predetermined number of bits (for example, 8 bits). To do. The output value is output from the AD conversion unit 117 to the drive control unit 95. A reset signal is output from the monitoring unit 118 to the drive control unit 95, and the drive control unit 95 counts the number of resets based on the reset signal from the monitoring unit 118.

  The drive control unit 95 obtains detection data corresponding to the capacitance at the electrode intersection based on the output value of the reception signal processing unit 104 and the number of resets. As described above, the detection data of each electrode intersection acquired by the drive control unit 95 is the discrimination processing between the foreign matter and the touch in the foreign matter / touch discrimination unit 96, and whether or not there is a foreign matter in the foreign matter judgment unit 97. And the touch position calculation process in the touch position calculation unit 98.

  As described above, in this embodiment, the foreign object / touch detection control unit 92 integrates the signal based on the response signal from the reception electrode 42 as shown in FIG. Since the integration unit 115 that resets the integral value to zero when the threshold value is reached, the amount of change in the detection amount that changes according to the presence or absence of the foreign object and the touch operation increases, so the detection sensitivity of the foreign object and the touch operation is increased. Can be improved.

  Further, in the present embodiment, the foreign object / touch detection control unit 92 is provided in an integration unit 115 that integrates a signal based on the response signal from the reception electrode 42, and a front stage of the integration unit 115. And the clamp unit 114 that holds a signal based on the response signal from the response signal at a predetermined value or more, and the amount of change in the detection amount that changes depending on the presence or absence of the foreign object and the touch operation increases. The detection sensitivity of the operation can be improved.

  Next, the principle of foreign object detection in the foreign object detection process performed by the foreign object / touch detection control unit 92 shown in FIG. 5 will be described. 8 and 9 are explanatory diagrams for explaining the principle of foreign matter detection in the foreign matter detection process performed by the foreign matter / touch detection control unit 92. FIG. 8 shows a case of a foreign matter made of a conductor such as metal. FIG. 9 shows the case of a foreign substance made of an insulator such as resin.

  First, the case of a foreign substance made of a conductor such as metal will be described with reference to FIG. 8A is a cross-sectional view when the foreign object E is not present on the placement surface 11, and FIG. 8B is a cross-sectional view when the foreign matter E is present on the placement surface 11. FIG. 8C is a circuit diagram showing an equivalent circuit in the case where the foreign substance E exists on the placement surface 11.

  As shown in FIG. 8A, a base sheet (insulating layer) 43 is interposed between the transmission electrode 41 and the reception electrode 42, and the base sheet 43 causes a foreign substance E to be present on the mounting surface 11. If not, an electrostatic capacitance C0 is formed between the transmission electrode 41 and the reception electrode.

  As shown in FIG. 8B, when the foreign substance E made of a conductor such as metal is placed on the placement surface 11, a capacitance C1 is generated between the transmission electrode 41 and the foreign substance E. A capacitance C2 is generated between the foreign substance E and the receiving electrode 42. On the other hand, between the transmission electrode 41 and the reception electrode 42, an electric force line circulates toward the foreign substance E, so that the electrostatic capacity C3 is smaller than the electrostatic capacity C0 when the foreign substance E is not present on the placement surface 11. Is formed (C3 <C0).

  As a result, when a foreign substance E made of a conductor such as metal is present on the placement surface 11, the transmission electrode 41 and the reception electrode 42 are connected in series as shown in FIG. An equivalent circuit is formed in which the capacitance C3 is connected in parallel to the capacitance C1 and the capacitance C2. Here, the capacitance directly formed between the transmission electrode 41 and the reception electrode 42 is C0. However, the total capacitance between the transmission electrode 41 and the reception electrode 42 increases.

  Next, the case of a foreign substance made of an insulator such as a resin will be described with reference to FIG. 9A-1 and 9A-2 are cross-sectional views when the foreign matter E is not present on the mounting surface 11, FIG. 9A-1 shows electric lines of force, and FIG. A-2) shows the capacitance. 9B-1 and 9B-2 are cross-sectional views when the foreign matter E is not present on the mounting surface 11, FIG. 9B-1 shows electric lines of force, and FIG. B-2) shows the capacitance.

  When the foreign substance E does not exist on the placement surface 11, as shown in FIG. 9A-1, a driving signal is applied to the transmission electrode 41 to generate electric lines of force. As shown in 2), a capacitance C0 is formed between the transmission electrode 41 and the reception electrode.

  When the foreign matter E made of an insulator such as resin is placed on the placement surface 11, the foreign matter E has a dielectric constant larger than that of air as shown in FIG. Around the foreign substance E, and the electrostatic capacity as a whole increases. As shown in FIG. 9B-2, the electrostatic capacity when the foreign substance E does not exist on the placement surface 11 is increased. A capacitance C3 larger than the capacitance C0 is formed (C3> C0).

  As described above, when a foreign object is placed on the placement surface 11, the capacitance at the electrode intersection increases regardless of either a conductor such as metal or an insulator such as resin. Therefore, the foreign matter determination unit 97 (see FIG. 5) stores the capacitance C0 at the electrode intersection when no foreign matter is placed as an initial value, and detects the initial value and detection of foreign matter after the foreign matter is started. It is possible to determine whether or not there is a foreign substance based on whether or not the difference exceeds a predetermined threshold value by comparing with the capacitance at each electrode intersection.

  10 and 11 are explanatory diagrams for explaining the procedure for detecting foreign matter. FIG. 10 is for explaining the difference depending on the position of the foreign matter. FIG. The difference depending on whether or not there is will be described. In FIG. 11, the positions of electrode intersections corresponding to the capacitances C11 to C13, C21 to C23, and C31 to C33 are the same as in the example shown in FIG.

  Here, as shown in FIG. 10A, for the sake of convenience of explanation, a simple configuration including three transmission electrodes 41 (Se1, Se2, Se3) and three reception electrodes 42 (Re1, Re2, Re3). An example will be described. Capacitances C11 to C33 are formed at each electrode intersection.

  Here, when a foreign substance is present at the position P1 shown in FIG. 10A, the capacitance C22 at the electrode intersection corresponding to the position P1 is present as shown in FIG. 10B. The value is larger than the capacitance when not. Due to this change in capacitance, it is possible to detect the presence of foreign matter at the position P1.

  On the other hand, when a foreign substance exists at the position P2 (intermediate position of the four electrode intersections) shown in FIG. 10 (A), the four electrodes around the position P2 are shown in FIG. 10 (C). The electrostatic capacitances C11, C21, C21, and C22 at the intersections are larger than the electrostatic capacitance when no foreign matter is present. By this change in capacitance, it can be detected that a foreign substance is present at a position P2 between the four electrode intersections.

  Although a simple example has been described here, a weighted interpolation calculation is performed on the assumption that a required interpolation method (for example, the center of gravity method) is used, that is, the electrode intersection having a large capacitance is closer to the foreign object. As a result, the position coordinates of the foreign matter in the orthogonal coordinate system of the X direction (the arrangement direction of the reception electrodes 42) and the Y direction (the arrangement direction of the transmission electrodes 41) can be obtained with high accuracy from the capacitance of each electrode intersection. Can do.

  As shown in FIG. 11A, when the electronic device 3 to which no foreign matter is attached is placed on the placement surface 11, the capacitance at each electrode intersection shows a large value as a whole. This is because the capacitance of the electrode intersection increases because the casing 31 of the electronic device 3 is made of a resin (insulator) having a dielectric constant ε higher than that of air. It is possible to detect that the electronic device 3 to which no foreign matter is attached is placed on the placement surface 11 by this change in capacitance.

  On the other hand, as shown in FIG. 11 (B), when the electronic device 3 to which foreign matter is attached is placed on the placement surface 11, the capacitance at each electrode intersection generally shows a large value. In this case, the capacitance C22 at the electrode intersection corresponding to the position of the foreign object shows a larger value than the other electrode intersection. It is possible to detect that the electronic device 3 to which foreign matter is attached is placed on the placement surface 11 by this change in capacitance.

  As described above, in the present embodiment, since the foreign matter is detected based on the change in electrostatic capacitance at each electrode intersection where the plurality of transmission electrodes 41 and reception electrodes 42 arranged in a lattice shape intersect, the mounting of the power feeding device 2 is performed. In addition to determining whether or not there is a foreign object between the mounting surface 11 and the facing surface 33 of the electronic device 3, determining the position where the foreign object is present, It can also be determined whether or not there is.

  Next, the principle of touch detection in the touch detection process performed by the foreign object / touch detection control unit 92 shown in FIG. 5 will be described. FIG. 12 is an explanatory diagram for explaining the principle of touch detection in the touch detection process performed by the foreign object / touch detection control unit 92.

  As shown in FIG. 12A, a base sheet (insulating layer) 43 is interposed between the transmission electrode 41 and the reception electrode 42, and the base sheet 43 is in a state where no touch operation is performed. A capacitance C0 is formed between the transmission electrode 41 and the reception electrode.

  Then, as shown in FIG. 12B, when the user performs a touch operation with an indicator (such as a finger) F, a capacitance C1 is generated between the transmission electrode 41 and the indicator F, and the indicator F A capacitance C2 is generated between the receiving electrodes 42. On the other hand, since the lines of electric force change between the transmitting electrode 41 and the receiving electrode 42 due to the presence of the indicator F, the capacitance is smaller than the capacitance C0 when the indicator F is not present on the facing surface 34. A capacitance C3 is formed (C3 <C0).

  Thereby, when the indicator F exists on the opposing surface 34, as shown in FIG. 12C, a capacitance C1 connected in series between the transmission electrode 41 and the reception electrode 42 and An electrostatic capacity C3 is connected in parallel to the electrostatic capacity C2, and an equivalent circuit in which a grounded human body impedance is connected is formed between the electrostatic capacity C1 and the electrostatic capacity C2. The current passing through the capacitance C1 flows to the human body impedance side, the current to the capacitance C2 side becomes substantially zero, and the capacitance C3 is connected in parallel to the capacitances C1 and C2. Nevertheless, as a result, the overall capacitance between the transmission electrode 41 and the reception electrode 42 decreases.

  Next, the procedure of the foreign object / touch detection process performed by the foreign object / touch detection control unit 92 shown in FIG. 5 will be described. FIG. 13 is a flowchart illustrating a foreign object / touch detection process performed by the foreign object / touch detection control unit 92.

  First, the drive control unit 95 obtains detection data D0 (x, y) for every electrode intersection (x, y) in an initial state without foreign matter and a touch operation in calibration at the time of startup or the like. Performed (ST101). Then, when scanning for foreign object / touch detection is started and a predetermined time T1 corresponding to the sampling rate has elapsed (Yes in ST102), detection data D (x, y) for all electrode intersections (x, y) is detected. ) Is acquired (ST103).

  Next, the foreign object / touch discriminating unit 96 compares D (x, y) and D0 (x, y) to discriminate the foreign object from the touch operation (ST104), and D (x, y). If is equal to DO (x, y), nothing is performed (no operation) (ST105). On the other hand, when D (x, y) is smaller than DO (x, y), detection data D (x, y) is sent to the touch position calculation unit 98 (ST106). In the touch position calculation unit 98, Processing for obtaining the touch position from the detection data D (x, y) at each electrode intersection is performed using a required interpolation method. If D (x, y) is greater than DO (x, y), the detection data D (x, y) is sent to the foreign matter determination unit 97 (ST107). It is determined whether or not there is a foreign object by comparing the intersection detection data D (x, y) with a threshold value.

  FIG. 14 is an explanatory diagram for explaining a situation where a ghost point occurs during multi-touch operation in the foreign object / touch detection unit 91 shown in FIG. 5, and FIG. 14A shows a drive signal (transmission) to the first electrode Y2. 14B is applied, and FIG. 14B shows the case where a drive signal is applied to the first electrode Y4.

  In the present embodiment, multi-touch is possible. For example, it is possible to perform pinch-in and pinch-out operations by touching with two fingers. When such a multi-touch operation is performed, a ghost point is generated. At this ghost point, a signal change appears as if a foreign object exists, and it is erroneously determined that a foreign object exists.

  In the example shown in FIG. 14, two fingers F1 and F2 touch the touch points Pt1 (X2, Y2) and Pt2 (X4, Y4), respectively. In this case, two ghost points Pg1 (X2, Y4) , Pg2 (X4, Y2) is generated. Since the ghost point detection data D (X2, Y4) and D (X4, Y2) are larger than the detection data in the initial state, it is erroneously determined that foreign matter exists at the two ghost points Pg1 and Pg2.

  Specifically, as shown in FIG. 14A, when a drive signal is applied to the first electrode Y2, the first electrode F2 is connected via the capacitor Cy1 formed between the first electrode Y2 and the first finger F1. A current flows from the first electrode Y4 to the first finger F1, and this current flows through the human body to the second finger F2. Further, this current is formed between the second finger F2 and the second electrode X4. Flows from the second finger F2 to the second electrode X4 via the capacitor Cx2. Therefore, the charge / discharge current flowing through the second electrode X4 is apparently increased in response to the application of the drive signal to the first electrode Y2, so that the detection data D (4, 2) at the ghost point Pg1 is obtained. Therefore, it becomes larger than the detection data D0 (4, 2) in the initial state, and it is erroneously determined that foreign matter exists.

  Further, as shown in FIG. 14B, when a drive signal is applied to the first electrode Y4, the first electrode Y4 is connected via a capacitor Cy2 formed between the first electrode Y4 and the second finger F2. A current flows from the first finger F2 to the second finger F2, and this current flows to the first finger F1 through the human body. Further, this current is a capacitor formed between the first finger F1 and the second electrode X2. It flows from the first finger F1 to the second electrode X2 via Cx1. Therefore, the charge / discharge current flowing through the second electrode X2 is apparently increased in response to the application of the drive signal to the first electrode Y4, whereby the detection data D (2, 4) at the ghost point Pg2 is obtained. Therefore, it becomes larger than the detection data D0 (2, 4) in the initial state, and it is erroneously determined that foreign matter exists.

  Therefore, when the touch position calculation unit 98 detects a touch operation with a plurality of instructions, the foreign object determination and determination unit 97 does not perform foreign object determination, that is, ignores signal changes that appear at ghost points. Then, even when it is determined from the detection data D (x, y) that foreign matter is present, processing is performed that regards that foreign matter is not present.

  FIG. 15 is a plan view showing a modification of the transmission electrode 41 and the reception electrode 42.

  In the example shown in FIG. 15A, wide portions 121 and 122 are formed on the transmission electrode 41 and the reception electrode 42, respectively, and the wide portion 121 of the transmission electrode 41 is located between two adjacent reception electrodes 42. The widened portion 122 of the reception electrode 42 is located between two adjacent transmission electrodes 41. The widened portions 121 and 122 have a rhombus shape (rectangular shape), are arranged so that the diagonal direction is the extending direction of the transmission electrode 41 and the reception electrode 42, and are connected to each other at two vertices in the diagonal direction. Yes. In addition, the widened portions 121 and 122 respectively provided on the transmission electrode 41 and the reception electrode 42 are in a staggered arrangement as a whole.

  When the transmission electrode 41 and the reception electrode 42 are configured in this manner, the amount of change in electrostatic capacitance that changes in accordance with a foreign object and a touch operation increases, so that the detection sensitivity of the foreign object and the touch operation can be improved.

  In the example shown in FIG. 15B, as in the example shown in FIG. 15A, the widened portions 123 and 124 are formed on the transmitting electrode 41 and the receiving electrode 42, respectively. In the example, the widened portions 121 and 122 are densely formed, whereas in the example shown in FIG. 15B, the widened portions 123 and 124 are formed in a mesh shape. The widened portions 123 and 124 are formed so that a plurality of conductor lines intersect each other.

  When the transmission electrode 41 and the reception electrode 42 are configured in this way, it is possible to suppress the reduction in power transmission efficiency due to the presence of the transmission electrode 41 and the reception electrode 42 between the power transmission coil 13 and the power reception coil 32. it can.

(Second Embodiment)
FIG. 16 is a front view, a rear view, and a development view showing an electrode sheet (sensor unit) 131 provided in the electronic apparatus 3 according to the second embodiment. FIG. 16 (A) is a front view showing the front sensor unit 132. FIG. 16B is a rear view showing the rear sensor unit 133, and FIG. 16C is a development view of the electrode sheet. The points not particularly mentioned here are the same as in the first embodiment.

  The electrode sheet 131 includes a front sensor unit 132 disposed on the front surface side of the housing 31 of the electronic device 3 and a back sensor unit 133 disposed on the back surface (opposing surface 34) side of the housing 31. The sensor unit 132 and the back sensor unit 133 are configured by forming the transmission electrode 41 and the reception electrode 42 on a single foldable base sheet 134, and the front sensor section 132 and the back surface are formed by bending the base sheet 134. The sensor part 133 is formed in the form located in the front side and back side of a housing | casing, respectively. As shown in FIG. 16B, the transmission electrode 41 and the reception electrode 42 are connected to a transmission unit 93 and a reception unit 94 (see FIG. 5), respectively.

  As shown in FIG. 16C, the electrode sheet 131 has a front surface portion 131a, a first back surface portion 131b and a second back surface portion 131c, a first side surface portion 131d and a second side surface portion 131e. And is bent at a fold line that becomes a boundary between the respective parts.

  The transmission electrode 41 is formed on the surface of the base material sheet 134, and the reception electrode 42 is formed on the back surface of the base material sheet 134. In the front surface portion 131a, the transmission electrode 41 and the reception electrode 42 intersect each other with the base sheet 134 interposed therebetween, and the front surface sensor portion 132 is configured by the front surface portion 131a. In the first back surface portion 131b, the transmission electrode 41 is formed on the surface of the base material sheet 134. In the second back surface portion 131c, the reception electrode 42 is formed on the back surface of the base material sheet 134. In a state where 131b and the second back surface portion 131c overlap each other, the transmission electrode 41 and the reception electrode 42 intersect each other with the base sheet sheet 134 constituting the first back surface portion 131b and the second back surface portion 131c interposed therebetween. Thus, the rear sensor unit 133 is configured.

  The front sensor unit 132 is disposed on the front side of the display panel 6, and the front sensor unit 132 and the display panel 6 constitute a touch panel display. The front sensor unit 132 is dedicated to touch operation detection, and the rear sensor unit 133 is The foreign object detection and the touch operation detection are combined. Note that the back sensor unit 133 may be dedicated to foreign object detection.

  As in the example shown in FIG. 3, the electrode sheet 131 includes a transmission electrode sheet in which the transmission electrode 41 is formed and a reception electrode sheet in which the reception electrode 42 is formed on each surface of the base sheet. It may have a configuration in which they are bonded and integrated.

  17 is a front view, a rear view, and a developed view showing an electrode sheet (sensor unit) 141 according to a modification of the second embodiment shown in FIG. 16, and FIG. 17 (A) shows the front sensor unit 142. FIG. 17B is a rear view showing the back sensor unit 143, and FIG. 17C is a development view of the electrode sheet. The points not particularly mentioned here are the same as in the second embodiment.

  In this modified example, the electrode sheet 141 includes the front sensor unit 142 disposed on the front side of the casing 31 of the electronic device 3 and the rear surface (opposing surface 34) of the casing 31 as in the example illustrated in FIG. In this modification, the first side sensor unit 144 and the second side sensor unit 145 are further provided on the side surface side of the housing 31. .

  The first side sensor unit 144 and the second side sensor unit 145 are configured by forming the transmission electrode 41 and the reception electrode 42 on a single foldable base sheet 146 together with the front sensor unit 142 and the rear sensor unit 143. By bending the base sheet 146, the front sensor unit 142 and the rear sensor unit 143 are positioned on the front side and the rear side of the casing, respectively, and the first side sensor unit 144 and the second side sensor unit 145 are the casing. It forms in the form located in the side surface side of 31. FIG.

  Moreover, in this modification, as shown in FIG. 17B, a transmission unit 93 and a reception unit 94 (see FIG. 5) to which the transmission electrode 41 and the reception electrode 42 are connected are mounted on the electrode sheet 141, respectively. In order to secure the arrangement space, the effective detection area of the back sensor unit 143 is small. In addition, although the width of the transmission electrode 41 and the reception electrode 42 is narrow in the back sensor unit 143, the width of the transmission electrode 41 and the reception electrode 42 may be the same as that of the front sensor unit 142 and the side sensor units 144 and 145. Good.

(Third embodiment)
FIG. 18 is a cross-sectional view of the power supply device 2 and the electronic device 3 according to the third embodiment. FIG. 19 is a plan view showing a state in which the electronic device 3 is placed on the power feeding device 2 shown in FIG. The points not particularly mentioned here are the same as in the first embodiment.

  In the third embodiment, as shown in FIG. 18, unlike the first embodiment, the electronic device 3 is formed in a curved surface in which the facing surface 34 facing the power feeding device 2 in the housing 31 is curved. Moreover, in this 3rd Embodiment, although the electronic device 3 is provided with the electrode sheet (sensor part) 33 which combines a foreign material detection and a touch detection similarly to 1st Embodiment, it differs from 1st Embodiment. The power feeding device 2 also includes an electrode sheet (sensor unit) 151 that is used for both foreign object detection and touch detection.

  In the third embodiment, since the facing surface 34 of the electronic device 3 is formed in a curved surface, when the electronic device 3 is placed on the power feeding device 2, only a part of the facing surface 34 of the electronic device 3 is placed. A gap is generated between the mounting surface 11 of the power feeding device 2 and the facing surface 34 of the electronic device 3 in contact with the mounting surface 11. For this reason, although the foreign material E1 adhering to the opposing surface 34 of the electronic device 3 can be detected with high sensitivity by the electrode sheet 33 of the electronic device 3, the foreign material E2 adhering to the mounting surface 11 of the power feeding device 2 is The electrode sheet 33 of the electronic device 3 cannot be detected with high sensitivity. However, in the third embodiment, since the power supply apparatus 2 also includes the electrode sheet 151, the foreign matter E2 attached to the placement surface 11 of the power supply apparatus 2 can be detected with high sensitivity.

  In the third embodiment, the upper surface 152 of the power feeding device 2 is sufficiently larger than the electronic device 3, and the electrode sheet 151 of the power feeding device 2 is provided so as to cover substantially the entire upper surface 152. As shown in FIG. 19, in the arrangement area of the electrode sheet 151, a placement area 153 on which the electronic device 3 is placed and a touch operation area in which the user performs a touch operation with an indicator (such as a finger) F 154 and 155 are set.

  The placement area 153 is used for detecting a foreign object existing between the power supply apparatus 2 and the electronic device 3, and the touch operation areas 154 and 155 are used for detecting a touch operation. That is, when detection data indicating that the capacitance is larger than the initial value is obtained at a position corresponding to the placement area 153, it is determined that a foreign object is present, and static is detected at positions corresponding to the touch operation areas 154 and 155. When detection data indicating that the electric capacity is smaller than the initial value is obtained, it is determined that a touch operation has been performed. In addition, the mounting area 153 becomes the mounting surface 11 in the upper surface 152, and in this mounting area 153, non-contact power transmission between the power transmission coil 13 and the power receiving coil 32 (see FIG. 2) is performed. Done.

  FIG. 20 is a schematic configuration diagram of a main part related to control of the power feeding device 2 and the electronic device 3 illustrated in FIG. 18. The power supply apparatus 2 includes a foreign matter / touch detection control unit 162 similar to the foreign matter / touch detection control unit 92 of the electronic device 3. The foreign matter / touch detection control unit 162 and the electrode sheet 151 are used to form a foreign matter / touch detection unit. 161 is configured. The touch position calculation unit 163 provided in the foreign object / touch detection control unit 162 performs processing for obtaining the touch position in the touch operation areas 154 and 155.

  In addition, the power supply device 2 and the electronic device 3 each include communication units 164 and 165 that exchange information via an appropriate communication medium, and the touch position information acquired by the touch position calculation unit 163 is transmitted from the power supply device 2. It is transmitted to the electronic device 3. In the main control unit 37 of the electronic device 3, processing related to the screen operation of the display panel 6 and the like is executed based on the touch position information acquired from the power supply device 2. Note that the communication units 164 and 165 of the power supply device 2 and the electronic device 3 can be used in the information transmission / reception units 72 and 82 (see FIG. 4).

  Accordingly, the electronic device 3 can be operated by performing a touch operation in the touch operation areas 154 and 155 of the power supply device 2. For example, an operation on the screen displayed on the display panel 6, that is, an icon on the screen is selected. You can perform screen operations such as performing operations.

  In the present embodiment, the touch operation for operating the electronic device 3 with the power supply device 2 is performed using the electrode sheet 151 of the power supply device 2, but the power supply device 2 is simply used for foreign object detection. An electrode sheet may be provided. In this case, it is not necessary to make the upper surface of the power feeding device 2 sufficiently larger than the electronic device 3.

  In the present embodiment, the facing surface 34 is formed so that the cross section has a substantially arc shape. However, the facing surface is not limited to this, and may be a non-planar surface. In some cases, it may be formed of a curved surface, or it may be uneven.

  As described above, in the present embodiment, both the power supply device 2 and the electronic device 3 are provided with the sensor units (electrode sheets 33 and 151) that are used for both foreign object detection and touch detection. Foreign matter adhering to the mounting surface 11 and the facing surface 34 of the electronic device 3 can be detected with high sensitivity. The electronic device 3 can be operated by performing a touch operation with the power feeding device 2 while the electronic device 3 is being charged. In the configuration provided with the touch panel display on the front side of the electronic device 2, the screen operation can be performed even during charging. In this case, the electronic device 2 becomes difficult to perform the touch operation due to displacement, but in the present embodiment, There is no such problem, and the touch operation can be performed smoothly.

  In the present embodiment, the screen operation is performed by a touch operation on the back of the electronic device, and the sensor unit (electrode sheet 33) is used as a position input device (pointing device) for inputting a position on the screen. However, the sensor unit is not limited to such a position input application, and operations other than the screen operation may be performed by a touch operation on the back surface of the electronic device.

  In each of the embodiments described above, the power transmission coil 13 and the power reception coil 32 are spiral coils wound in a planar direction, but the shape of the coil is not particularly limited. The power transmission coil 13 and the power reception coil 32 may be wound in a direction perpendicular to the opening surface of the coil, such as a helical coil. In addition, when the opening surface of the power receiving coil 32 is large, sensor units such as electrode sheets 33, 131, and 141 may be disposed in the power receiving coil 32.

  The electronic device and the non-contact power supply device according to the present invention use the foreign matter sensor and the touch sensor as a single sensor, and the heat generated by the foreign matter interposed between the power supply device and the electronic device without increasing the manufacturing cost. An electronic device that has the effect of improving the convenience of the user and that is mounted on the mounting surface of the power supply device, and in which power is transmitted in a non-contact manner from the power supply device, and the electronic device This is useful as a non-contact power feeding device that has a mounting surface on which is mounted, and transmits electric power in a non-contact manner to an electronic device mounted on the mounting surface.

DESCRIPTION OF SYMBOLS 1 Non-contact electric power transmission system 2 Electric power feeder 3 Electronic device 6 Display panel 11 Mounting surface 12 Case 13 Power transmission coil 31 Case 32 Power reception coil 33 Electrode sheet (sensor part)
34 Opposite surface (back)
41 Transmission electrode 42 Reception electrode 91 Foreign object / touch detection unit 92 Foreign object / touch detection control unit 96 Foreign object / touch determination unit 97 Foreign object determination unit 98 Touch position calculation unit 114 Clamp unit 115 Integration units 121, 122, 123, 124 Widening unit 131 141 electrode sheet (sensor part)
131a Front part 131b, 131c Rear part 131d, 131e Side part 132, 142 Front sensor part 133, 143 Rear sensor part 134, 146 Base sheet 144, 145 Side sensor part 151 Electrode sheet (sensor part)
152 Upper surface 153 Placement area 154, 155 Touch operation area

Claims (12)

An electronic device that is mounted on a mounting surface of the power feeding device and performs power transmission in a non-contact manner from the power feeding device,
A housing,
A display panel arranged on the front side of the housing;
A power receiving coil disposed in the housing;
A sensor unit having a first electrode and a second electrode and disposed in the housing;
Based on the response signal output from the second electrode in response to the drive signal applied to the first electrode, the foreign object existing on the back side facing the mounting surface is detected, and the user on the back side An electronic apparatus comprising: a detection control unit that detects an instruction to perform a touch operation.   The electronic device according to claim 1, wherein the sensor unit is provided along the back surface of the housing.   The detection control unit discriminates a foreign object and an indicator based on a change in capacitance appearing in detection data based on the response signal, and the detection data indicates that the capacitance is larger than an initial value. 2. In the case, it is determined that a foreign substance is present, and if the detected data indicates that the capacitance is smaller than an initial value, it is determined that an indicator is present. Or the electronic device of Claim 2.   The electronic device according to claim 3, wherein the detection control unit does not perform foreign object detection when a plurality of instructions to be touched are detected at the same time.   The detection control unit includes an integration unit that integrates a signal based on a response signal from the second electrode and resets the integration value to zero when the integration value by the integration processing reaches a predetermined threshold value. The electronic device according to any one of claims 1 to 4.   The detection control unit is provided in the preceding stage of the integration unit that integrates a signal based on the response signal from the second electrode, and a signal based on the response signal from the second electrode is predetermined. The electronic device according to claim 1, further comprising a clamp portion that holds the value more than the value.   The first electrode has a widened portion at a position between two adjacent second electrodes, and the second electrode has a widened portion at a position between two adjacent first electrodes. The electronic apparatus according to claim 1, wherein the electronic apparatus is an electronic apparatus.   The electronic device according to claim 7, wherein the widened portion is formed in a mesh shape. The sensor unit includes a front sensor unit disposed on the front side of the housing, and a back sensor unit disposed on the back side of the housing,
The front sensor part and the back sensor part are composed of a single electrode sheet in which the first electrode and the second electrode are formed on one foldable base sheet, and by bending the electrode sheet, The electronic device according to any one of claims 1 to 8, wherein the front sensor unit and the rear sensor unit are formed on a front side and a back side of the casing, respectively. The sensor unit further includes a side sensor unit disposed on a side surface of the housing,
The side sensor part is composed of a single electrode sheet in which the first electrode and the second electrode are formed on a foldable base sheet together with the front sensor part and the back sensor part. The electronic device according to claim 9, wherein the side sensor unit is formed in a form positioned on a side surface side of the housing by bending a sheet. The electrode sheet is disposed on a front surface portion disposed on a front surface side of the housing, a first back surface portion and a second back surface portion disposed on a back surface side of the housing, and on a side surface side of the housing. A first side surface portion and a second side surface portion,
The first electrode and the second electrode are provided on both front and back surfaces of the base sheet,
The said front part comprises the said front sensor part, and the said 1st back part and the said 2nd back part comprise the said back sensor part by overlapping each other, The Claim 9 or Claim 10 characterized by the above-mentioned. Electronics. A non-contact power feeding device that has a mounting surface on which an electronic device is mounted and performs power transmission in a non-contact manner to the electronic device,
A housing,
A power transmission coil disposed in the housing;
A sensor unit that has a first electrode and a second electrode, and is disposed in the housing along a surface facing the electronic device;
Foreign matter detection processing for detecting foreign matter present on a surface facing the electronic device based on a response signal output from the second electrode in response to a drive signal applied to the first electrode, and the electronic device A detection control unit that performs a touch detection process for detecting an instruction that the user performs a touch operation on the surface facing
The sensor unit is formed wider than a surface facing the power supply device in the electronic device,
The detection control unit performs the foreign object detection processing in a placement region where the electronic device is placed in a region where the sensor unit is disposed, and performs the touch detection processing in a region excluding the placement region. The non-contact electric power feeder characterized by the above-mentioned.

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