JP2011139589A - Image display device and stand - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television device capable of wirelessly receiving the supply of power by converting a magnet field generated from an external transmission coil to power. <P>SOLUTION: A stand part 3 supporting a display part 2 includes: a shaft perpendicular to a stand base part 4; a stand cover 20 and a lid 21 rotated around the horizontal shaft; a rotation mechanism part which rotate the stand cover 20 and the lid 21; and a motor which drives the rotation mechanism part. A power receiving coil to generate power in resonance with the magnetic field generated from the transmission coil is provided at the lid 21, and the motor is controlled so that power feed efficiency from the power transmission coil to the power receiving coil becomes equal to or higher than a predetermined threshold based on relative position information obtained from a position detection part 6 to detect a relative position between the power transmission coil and the power receiving coil. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a television apparatus that receives power supply wirelessly.

  In recent years, a system for supplying electric power to electronic devices wirelessly has been devised (see Patent Documents 1 and 2). Non-Patent Document 1 reports a wireless power supply system based on magnetic field resonance. According to this, when the coil is made of copper, a transmission efficiency of 45% or more can be obtained even if a coil having a radius of 30 cm is theoretically separated by 3 m. In the experiment, it has been confirmed that two coils with a radius of 6 cm made of copper wire having a diameter of 6 mm are separated by 2 m or more, the power transmission coil is connected to a 10 MHz AC power source, and a 60 W bulb can be lit on the power receiving coil side.

JP 2007-301177 A JP 2008-283804 A

“NE Nikkei Electronics” published by Nikkei BP, December 3, 2007, p. 117-p. 127

  An object of the present invention is to provide a television apparatus that can receive power supply wirelessly by converting a magnetic field generated from an external power transmission coil as described above into electric power.

The present invention includes a display unit that displays an image;
A stand unit for supporting the display unit;
A power receiving unit that is provided in the stand unit and generates electric power by resonating with a magnetic field generated from an external power transmission device and wirelessly propagating through a space;
A supply unit for supplying power generated by the power receiving unit to the display unit;
An image display apparatus comprising:

  ADVANTAGE OF THE INVENTION According to this invention, the television apparatus which can receive electric power supply by radio | wireless by converting the magnetic field which generate | occur | produces from an external power transmission coil into electric power can be provided.

External view showing the configuration of the television apparatus of Examples 1 and 2 Example of arrangement location of television apparatus of first and second embodiments The block diagram which shows the function structure of the television apparatus of Example 1 and 2 The back view of the stand cover and lid of Example 1, and the top view of a base plate Sectional drawing seen from the front and right side of the stand base part of Example 1 Flowchart of power coil adjustment automatic adjustment process of television apparatus of embodiment 1 The back view of the stand cover and lid of Example 2, and the top view of a base plate Sectional drawing seen from the front and right side of the stand base part of Example 2. Flowchart of power receiving coil inclination manual adjustment process of television apparatus of embodiment 2

(Example 1)
Hereinafter, embodiments of the present invention will be exemplarily described based on the drawings. FIG. 1 is an external view of a television set fed by a magnetic resonance wireless power supply system according to a first embodiment of the present invention. In the wireless power supply system, the power supply efficiency changes depending on the positional relationship between the power transmission coil and the power reception coil. Since the installation location of the television device may be moved, there is a possibility that the positional relationship between the power transmission coil mounted on the power transmission device and the power reception coil mounted on the television device changes to reduce power supply efficiency. In view of this point, the present embodiment is configured such that, in a television apparatus to which power is supplied wirelessly, a reduction in power supply efficiency can be suppressed when the installation location of the television apparatus changes. This will be described in detail below.

  The wireless power supply system used in the television device 1 according to the present embodiment is configured to supply power from a power transmission device provided outside the television device 1 to a power receiving device provided in the television device 1 by a magnetic field that wirelessly propagates through space. . The television device 1 (image display device) includes a display unit 2 and a stand unit 3 that can support the display unit 2, and the stand unit 3 includes a stand base unit 4 and a stand column 5. As will be described later, in the present invention, the power receiving coil constituting the power receiving device is mounted on the stand base portion 4. Further, the display unit 2 is provided with a position detection unit 6 that detects a relative position between the power transmission coil and the power reception coil. The location where the position detection unit 6 is provided is not limited to the display unit 2 and may be provided in any part of the television apparatus 1 as long as the positional relationship between the power transmission coil and the power reception coil can be detected. Further, the position detection unit 6 may be configured separately from the television device 1 and the detection information may be transmitted to the television device 1 by wire or wirelessly.

  FIG. 2 is a diagram illustrating an arrangement example when the television apparatus according to the first embodiment is installed in a room of an office or a general household, where (A) is a top view of the room and (B) is a front view of the room. is there. The position a indicates a case where the television apparatus 1 is placed on the rack with the wall, and the position b indicates a case where the television apparatus 1 is placed on the floor with the corner of the room. As shown in FIG. 2, the power transmission device 7 of the wireless power supply system is installed in the center of the ceiling of the room. A power transmission coil 8 is mounted on the power transmission device 7. The power transmission coil has a radius of about 50 cm to 100 cm. The size is not limited to this. Further, the installation location of the power transmission device 7 is not limited to the center of the ceiling, and the power transmission device 7 may be installed on another place or wall of the ceiling, laid on the floor, or embedded in the wall or floor.

FIG. 3 is a block diagram illustrating a functional configuration of the television apparatus 1 according to the first embodiment. In FIG. 3, blocks indicated by broken lines indicate on which physical component each functional block is mounted as described in FIG. In addition, the instruction unit 47 indicated by a broken line in FIG. 3 is a component of the television apparatus according to the second embodiment to be described later, and is not related to the present embodiment. Further, the reference numeral 48 shown in parentheses in the second rotation mechanism unit 19 is also related to the second embodiment and is not related to the present embodiment. The power transmission coil 8 generates a magnetic field, and this magnetic field wirelessly propagates through the space. In response to this, the power reception coil 9 resonates to generate electric power. The distance between the power transmission coil 8 and the power reception coil 9 is set to be about 3 m at the maximum. The distance between the power transmission coil 8 and the power reception coil 9 should be set as appropriate according to the specifications of the magnetic field resonance type wireless power supply system, and is not limited to this example. The power receiving coil 9 is mounted on the stand base unit 4 and connected to the power conversion unit 10 through a cable passing through the stand column 5. As a result, the power receiving coil 9 can supply power to the display unit 2. The power receiving coil 9 has a radius of about 30 cm. This is designed in consideration of the size of the stand portion 3 and the like, and is not limited to this size. The magnetic field energy received by the power receiving coil 9 is converted into AC power by the power converter 10. The AC power is rectified and branched by the power supply unit 11 connected from the power conversion unit 10, and supplied to the television circuit 12, the image display panel 13, the position detection unit 6, the control unit 14, the drive circuit 15, the motor 16, and the motor 17. The position detection unit 6, the power conversion unit 10, the power supply unit 11, the television circuit 12, the image display panel 13, the control unit 14, and the drive circuit 15 are mounted on the display unit 2, while the motors 16 and 17, the rotation mechanism unit 18 and the like. 19 is mounted on the stand base portion 4. The stand cover 20 and the lid 21 that forms part of the stand cover 20 are components of the stand base portion 4.

  The position detection unit 6 detects the relative position between the power transmission coil 8 and the power reception coil 9 and transfers the position information to the control unit 14. Based on the position information obtained from the position detection unit 6, the control unit 14 adjusts the angle between the lid 21 on which the power receiving coil 9 is mounted and the stand cover 20 to which the lid 21 is attached. 15 to transfer. The drive circuit 15 converts the drive control information obtained from the control unit 14 into a drive control signal and supplies the drive control signal to the motors 16 and 17. Based on the drive control signal received from the drive circuit 15, the motors 16 and 17 drive the rotation mechanism units 18 and 19 to adjust the position of the power receiving coil 9 by rotating the stand cover 20 and the lid 21. In this embodiment, the position detection unit 6 constitutes an “acquisition unit” of the present invention. The motors 16 and 17 constitute a “drive unit”. The power reception coil 9, the lid 21, and the stand cover 20 constitute a “power reception unit”.

  Hereinafter, based on FIG.4 and FIG.5, the rotation mechanism parts 18 * 19 which concern on Example 1, and the drive means containing the motors 16 * 17 are demonstrated. FIG. 4A is a rear view showing the stand cover 20 according to the first embodiment and the lid 21 that forms a part of the stand cover 20. FIG. 4B is a top view showing the base plate 22 that forms the base of the stand base portion 4 according to the first embodiment. FIG. 5A is a cross-sectional view of the stand base unit 4 according to the first embodiment when viewed from the front (a viewpoint facing the display unit 2). FIG. 5B is a cross-sectional view of the stand base unit 4 according to the first embodiment when viewed from the right side (right side toward the display unit 2). 5C is a cross-sectional view of the stand base portion 4 according to the first embodiment as viewed from the right side, and is a cross-sectional view excluding the periphery of the stand column 5 from FIG. 5B.

  The stand base portion 4 includes a base plate 22, a stand cover 20, and a stand column 5, and the stand cover 20 is an independent member having a top portion as a lid 21. The power receiving coil 9 is mounted inside the lid 21 via an attachment member 23. A cable 25 is connected to the power receiving coil 9, the stand column 5 is hollow, and an insertion hole 24 is provided at the base. The cable 25 is mounted on the display unit 2 from the insertion hole 24 via the stand column 5. It is led to the power converter 10 (not shown). The base plate 22 constitutes a “base”. The stand column 5 constitutes a “support portion”. The cable 25 constitutes a “supply unit”.

  The base plate 22 is fixed to the installation surface (floor, rack, etc.). The mechanism described below is configured such that the angle of the power receiving coil 9 provided on the stand cover 20 and therefore the base plate 22 is adjustable. That is, the stand cover 20 is configured to rotate (yaw rotation) about an axis perpendicular to the base plate 22 (a central axis of the stand column 5). The lid 21 is configured to rotate (pitch rotation) about a horizontal axis (a horizontal axis parallel to the base plate 22) with respect to the stand cover 20. The power receiving coil 9 is attached to the lid 21. Since the lid 21 is rotated with respect to the stand cover 20 and the stand cover 20 is yaw-rotated with respect to the installation surface (base plate 22), the power receiving coil 9 is free to rotate about two axes with respect to the installation surface, ie, the power transmission coil 8. Will have a degree.

<First rotation mechanism>
Next, the first rotation mechanism unit 18 that allows the stand cover 20 to rotate around the vertical axis (the center axis of the stand column 5) will be described. A pair of guide protrusions 26 are integrally formed on the base plate 22 inside the stand base portion 4. Inside the stand cover 20, a pair of guide grooves 27 are integrally formed at positions symmetrical with respect to the vertical axis. The guide grooves 27 and the guide protrusions 26 are formed in positions and dimensions so as to be fitted so as to be relatively movable in the circumferential direction around the vertical axis, whereby the stand cover 20 is perpendicular to the circumferential direction of the base plate 22. It is configured to be rotatable around its axis. The length of the guide protrusion 26 along the circumferential direction of the base plate 22 is formed such that the angle range in which the stand cover 20 can rotate about the vertical axis is 90 degrees. Further, the length of the protrusion of the guide protrusion 26 is formed so as to be fitted in the guide groove 27. Further, a stopper 28 is attached to the rear end of the stand cover 20 (the back side toward the display unit 2 and the back side end of the display unit 2). The stopper 28 contacts the end surface 29 of the guide projection 26 at a position where the stand cover 20 is rotated 45 degrees counterclockwise or clockwise around the vertical axis from the position shown in FIG. Is over 90 degrees. In this embodiment, the rotation range of the stand cover 20 is 90 degrees, but the rotation range is not limited to 90 degrees. For example, depending on the installation position of the power transmission device 7, the rotation range of the stand cover 20 may be 180 degrees.

<Second rotation mechanism>
Next, the second rotation mechanism 19 that allows the lid 21 to rotate about the horizontal axis in the left-right direction will be described. A pair of rotating shafts 30 and 31 are attached to positions of the stand cover 20 and the lid 21 that are symmetrical with respect to the central axis of the stand column 5. A pair of through holes 32 and 33 through which the rotary shafts 30 and 31 are inserted are provided at positions symmetrical to the center axis of the stand column 5 of the lid 21. A pair of through holes 34 through which the rotary shafts 30 and 31 are inserted are provided at positions symmetrical to the center axis of the stand column 5 of the stand cover 20. The rotary shaft 30 and the through hole 32 are D-cut, and the rotary shaft 30 is prevented from rotating with respect to the lid 21 and is inserted. The D cut is to cut a part of the round shaft with a straight line, and by filling a part of the round hole of the fitting object with the straight line to make a D cut, the shaft and the hole can be prevented from rotating. Further, the rotary shaft 30 is inserted into the through holes 32 and 34, and a driven gear 42, which will be described later, is inserted, and then an E ring 46 as a retaining member is pressure-bonded to the tip. Similarly, after the rotary shaft 31 is inserted into the through holes 33 and 34, the E ring 46 is crimped to the tip. In the present embodiment, the E-ring is used as the retaining member, but the E-ring is not limited at all.

<First driving means>
Next, the first drive means for driving the first rotation mechanism will be described. The motor 16 is fixed to the base plate 22. The motor 16 is a general stepping motor or the like. The stand cover 20 is a hollow columnar member having a circular cross section by a plane perpendicular to the central axis of the stand column 5, and rack teeth 35 are integrally formed in a part of the inner wall surface in the circumferential direction. A shaft 36 is fixed to the base plate 22 and an idler gear 37 is inserted. The idler gear 37 is a two-stage gear, and the first idler gear 38 meshes with the motor gear 39 and the second idler gear 40 meshes with the rack teeth 35. In this embodiment, the stand cover 20 is rotated by driving the rack teeth 35 using three idler gears, but the number of idler gears is not limited to this. In order to increase the reduction ratio, the modules of the first idler gear 38 and the motor gear 39 are set to be small and the number of teeth of the first idler gear 38 is set to be large. Further, in order to prevent tooth skipping between the second idler gear 40 and the rack teeth 35, the modules of the second idler gear 40 and the rack teeth 35 are set large, and the rack teeth 35 are teeth that cover the rotation range 90 degrees of the stand cover 20. The number is set. Further, a cable 41 is connected to the motor 16, and the cable 41 is guided from the insertion hole 24 to the drive circuit 15 (not shown) mounted on the display unit 2 via the stand column 5.

<Second drive means>
Next, a second drive unit that drives the second rotation mechanism unit will be described. A motor 17 is fixed to the stand cover 20. The motor 17 is a general stepping motor or the like. A driven gear 42 is inserted through the rotary shaft 30, a D-cut is applied to a through hole 43 provided in the driven gear 42, and the rotary shaft 30 is prevented from rotating with respect to the driven gear 42. Since the rotating shaft 30 is prevented from rotating with respect to the lid 21 according to the above description, the driven gear 42 is prevented from rotating with respect to the lid 21 via the rotating shaft 30. In this embodiment, the driven gear 42 meshes directly with the motor gear 44, but an idler gear may be meshed between them, and the number of idler gears is not limited. The driven gear 42 has a number of teeth that covers the rotation range of the lid 21. The rotation range of the lid 21 was ± 15 degrees around the horizontal axis with reference to the horizontal state of the lid 21 as indicated by a broken line in FIG. In FIG. 5C, the counterclockwise rotation direction is positive. For example, when the lid 21 is rotated +15 degrees around the horizontal axis from the horizontal state, the rear end of the lid 21 rises to the highest position as shown in FIG. The rotation range of the lid 21 is not limited to this. In addition, a cable 45 is connected to the motor 17, and the cable 45 is guided from the insertion hole 24 to the drive circuit 15 (not shown) mounted on the display unit 2 via the stand column 5.

<Control>
The first rotation mechanism section 18, the second rotation mechanism section 19, the first drive means, and the second drive means configured as described above automatically adjust the inclination of the power receiving coil 9 about the vertical and horizontal axes. The processing operation will be described based on the flowchart shown in FIG. When the television apparatus 1 starts up, first, in step S1, the position detection unit 6 transmits a position detection signal. The position detection unit 6 is a general focus sensor, a three-dimensional sensor, or the like, and is not particularly limited. In step S <b> 2, the position detection unit 6 identifies the position of the power transmission device 7, that is, the power transmission coil 8 from the returned position detection signal, and transfers the position information to the control unit 14. In step S <b> 3, the control unit 14 collates the position information of the power transmission coil 8 obtained from the position detection unit 6 with the prestored inclination of the power reception coil 9 about the vertical axis and the horizontal axis, and the power reception coil 9 is connected to the power transmission coil 8. Judge whether to face each other. Here, “facing” means that the relative positional relationship between the power transmission coil 8 and the power reception coil 9 is such that the power supply efficiency from the power transmission device 7 to the power reception coil 9 is equal to or higher than a predetermined reference. Say. The power feeding efficiency is highest when the power transmitting coil 8 and the power receiving coil 9 are facing each other. However, the magnetic field resonance type wireless power supply system can supply power with a certain power supply efficiency even if the power transmission coil 8 and the power reception coil 9 are not facing each other. This power supply efficiency depends on the relative positional relationship (position, angle) between the power transmission coil 8 and the power reception coil 9. If it is determined that they face each other, there is no need to adjust the inclination of the power receiving coil 9 about the vertical and horizontal axes, so the process proceeds to NO in step S3 and the process is terminated.

  If it is determined that they do not face each other, it is necessary to adjust the inclination of the power receiving coil 9 about the vertical axis and the horizontal axis, and the process proceeds to step S4. In step S <b> 4, the control unit 14 calculates the rotation angle around the vertical and horizontal axes of the power receiving coil 9 necessary for the power receiving coil 9 to face the power transmitting coil 8, and adjusts the positions of the lid 21 and the stand cover 20. Therefore, the drive control information is transferred to the drive circuit 15. In step S5, the drive circuit 15 converts the drive control information obtained from the control unit 14 into a drive control signal, that is, the number of steps required for each of the motors 16 and 17, and gives the motors 16 and 17 to drive them. . The motor 17 rotates the lid 21 around the horizontal axis via the motor gear 44, the driven gear 42 and the rotating shaft 30. The motor 16 rotates the stand cover 20 around the vertical axis via the motor gear 39, the first idler gear 38, the second idler gear 40, and the rack teeth 35. The motors 16 and 17 may rotate at the same time or one of them. In step S6, the motors 16 and 17 stop rotating when the necessary number of steps is completed, and the process is terminated.

  With the configuration described above, for example, in the case where the television apparatus 1 shown in the position a in FIG. 2 is placed on the rack while being placed on the wall, the rear end of the lid 21 is inclined to the highest position (the maximum angle in the positive direction around the horizontal axis) Rotate). As a result, the power receiving coil 9 faces the power transmitting device 7, that is, the power transmitting coil 8. In the case where the television apparatus 1 shown in the position b is placed on the floor near the corner of the room, the rear end of the lid 21 is tilted high (rotated in the positive direction around the horizontal axis) and the stand cover 20 is moved to the position shown in FIG. Rotate counterclockwise. As a result, the power receiving coil 9 faces the power transmitting device 7, that is, the power transmitting coil 8. Thus, according to the television apparatus 1 according to the first embodiment, the vertical axis of the power receiving coil 9 is set so that the power transmitting coil 8 and the power receiving coil 9 face each other according to the positional relationship between the television apparatus 1 and the power transmitting apparatus 7.・ The inclination around the horizontal axis is automatically adjusted. Therefore, even when the position of the television apparatus 1 changes, it is possible to suppress a decrease in power supply efficiency.

(Example 2)
A thin television apparatus fed by a magnetic resonance wireless power supply system according to a second embodiment of the present invention will be described. The functional configuration of the television apparatus according to the present embodiment is a configuration in which the drive unit including the drive circuit 15 and the motors 16 and 17 is deleted and an instruction unit 47 is added to the display unit 2 in the block diagram of FIG. In the present embodiment, the control unit 14 transfers the position information obtained from the position detection unit 6 to the instruction unit 47. The instruction unit 47 instructs the user to manually adjust the positions of the lid 21 on which the power receiving coil 9 is mounted and the stand cover 20 to which the lid 21 is attached based on the position information obtained from the control unit 14. Put out. The position of the power receiving coil 9 is adjusted by the user rotating the stand cover 20 and the lid 21 in accordance with an instruction from the instruction unit 47.

  Hereinafter, the rotation mechanism sections 18 and 48 according to the second embodiment will be described with reference to FIGS. A description of the same components as those in the first embodiment is omitted. FIG. 7A is a rear view showing the stand cover 20 according to the second embodiment and a lid 21 that forms a part of the stand cover 20. FIG. 7B is a top view showing the base plate 22 that forms the base of the stand base portion 4 according to the second embodiment. FIG. 8A is a cross-sectional view of the stand base portion 4 according to the second embodiment when viewed from the front (a viewpoint facing the display portion 2). FIG. 8B is a cross-sectional view of the stand base unit 4 according to the second embodiment when viewed from the right side (right side toward the display unit 2). FIG. 8C is a cross-sectional view of the stand base portion 4 according to the second embodiment viewed from the right side, and is a cross-sectional view excluding the periphery of the stand column 5 from FIG. 8B.

<Second rotation mechanism>
Since the first rotation mechanism unit 18 is the same as that of the first embodiment, the description thereof is omitted. The second rotation mechanism 48 that allows the lid 21 to rotate about the horizontal axis in the left-right direction will be described. The difference between the second embodiment and the first embodiment is that none of the pair of rotating shafts 49 and 50 is detented, and at least one of the rotating shafts 49 and 50 is a friction member between the lid 21 and the stand cover 20. That is, the spring washer 51 is inserted. This is because in this embodiment, the user manually adjusts the lid 21, so that the driven gear 42 for driving is not necessary and no rotation stop is necessary. Further, a spring washer 51, which is a friction member, is incorporated between the lid 21 and the stand cover 20 in order to maintain the inclination of the lid 21 after manual adjustment by the user. The friction member is not limited to a spring washer, and may be a coil spring or the like. Further, a holding member using viscous oil may be used. The motors 16 and 17 that have driven the first rotation mechanism 18 and the second rotation mechanism 19 in the first embodiment, and gears that transmit the driving force to the first rotation mechanism 18 and the second rotation mechanism 19. Does not have the television set of this embodiment.

<Control>
Next, a processing operation in which the user manually adjusts the inclination of the power receiving coil 9 about the vertical axis and the horizontal axis by the first rotation mechanism unit 18 and the second rotation mechanism unit 48 according to the second embodiment configured as described above, This will be described based on the flowchart shown in FIG. The processing from step S7 to step S9 executed when the television apparatus 1 is started up is the same as the processing content of step S1 to step S3 in the flowchart of FIG. In step S10, the control unit 14 calculates the rotation angle around the vertical and horizontal axes of the power receiving coil 9 necessary for the power receiving coil 9 to face the power transmitting coil 8, and determines the positions of the lid 21 and the stand cover 20 to the user. The position information is transferred to the instruction unit 47 for manual adjustment. In step S <b> 11, the instruction unit 47 issues an instruction to the user based on the position information obtained from the control unit 14. When the user rotates the stand cover 20 and the lid 21 in accordance with an instruction from the instruction unit 47, the position of the power receiving coil 9 is adjusted. The instruction unit 47 instructs the user to make adjustments by displaying characters and icons on a part of the image displayed on the screen of the display unit 2. Or the instruction | indication part 47 may instruct | indicate an adjustment to a user by blinking and lighting the LED group 52 (refer FIG. 1) provided in the front surface of the display part 2. FIG. Or the instruction | indication part 47 may instruct | indicate a user's adjustment by playing an audio | voice from the speaker 53 (refer FIG. 1). The method by which the instruction unit 47 instructs the user to rotate the stand cover 20 and the lid 21 is not limited to the above examples.

  In step S <b> 12, the position detection unit 6 specifies the position of the power receiving coil 9 (inclination angle around the vertical axis / horizontal axis) and transfers the position information to the control unit 14. In step S <b> 13, the control unit 14 collates the inclination of the power reception coil 9 obtained from the position detection unit 6 about the vertical and horizontal axes with the previously stored position information of the power transmission coil 8, and the power reception coil 9 faces the power transmission coil 8. Judge whether to do. If they face each other, it is not necessary to readjust the inclination of the power receiving coil 9 about the vertical and horizontal axes, and the process proceeds to NO in step 13. In step S14, the control unit 14 transfers information indicating that the adjustment is completed to the instruction unit 47, informs the user that the adjustment is completed, and ends the process. If the power receiving coil 9 does not face the power transmitting coil 8 in step S13, it is necessary to readjust the front / rear / left / right inclination of the power receiving coil 9, and the process proceeds to YES in step S13 to repeat this. You may make it progress to step S14 at the time of repeating predetermined times.

  With the configuration described above, for example, in the case where the television apparatus 1 shown in the position a in FIG. 2 is placed on the rack while being placed on the wall, the rear end of the lid 21 is inclined to the highest position (the maximum angle in the positive direction around the horizontal axis) The instruction unit 47 issues an instruction to rotate the image. The user can make the power receiving coil 9 face the power transmitting device 7, that is, the power transmitting coil 8 by manually moving the lid 21 in accordance with the instruction. Further, in the case where the television apparatus 1 shown at the position b is placed on the floor close to the corner of the room, the rear end of the lid 21 is tilted high (rotated in the positive direction around the horizontal axis) and the stand cover 20 is shown in FIG. The instruction unit 47 issues an instruction to rotate the counterclockwise direction of A). The user can manually move the lid 21 and the stand cover 20 in accordance with the instruction to make the power receiving coil 9 face the power transmitting device 7, that is, the power transmitting coil 8. Thus, according to the television device 1 according to the second embodiment, the user manually operates the power transmission coil 8 and the power reception coil 9 so as to face each other according to the positional relationship between the television device 1 and the power transmission device 7. Thus, the inclination of the power receiving coil 9 around the vertical and horizontal axes can be adjusted. Therefore, even when the position of the television apparatus 1 changes, it is possible to suppress a decrease in power supply efficiency.

(Modification)
In addition, although each said Example is an example which applied this invention to the television stand of the form which mounts on a rack or a floor and supports a display part from the bottom, this invention is fixed to a wall and a display part is back. It can also be applied to TV stands that are supported by In this case, the stand portion provided with the power receiving coil is substantially parallel to the wall surface. The power receiving coil can be configured to be rotatable by a predetermined angle around an axis parallel to the wall surface and an axis perpendicular to the wall surface. The power transmission device may be installed on a wall surface, a floor, a ceiling, or the like on the side facing the wall surface to which the television stand is fixed. The present invention can also be applied to a television stand that is fixed to the ceiling and supports the display unit by suspending it from above. In this case, the stand portion provided with the power receiving coil is substantially parallel to the ceiling surface. The power receiving coil can also be configured to be rotatable by a predetermined angle around an axis parallel to the ceiling surface and an axis perpendicular to the wall surface. The power transmission device should be installed on the floor or wall. In the above embodiment, the power transmission device is fixed and the television device is moved in the room. However, when the television stand is a wall-mounted type or a ceiling-suspended type, the installation location of the power transmission device is assumed to be movable. The angle of the power receiving coil may be changed according to the position of the power transmission device. The above embodiment is an example of a television apparatus provided with a power receiving coil capable of adjusting the angle in the stand portion. However, the angle adjustment is to realize that the television apparatus is supplied with power by a magnetic resonance type wireless power supply system. Is not an essential requirement. In addition, the present invention may be a general-purpose stand unit that is provided with a power receiving coil and can hold an arbitrary image display device. The cable for connecting the power receiving coil of the stand and the power supply terminal of the image display device does not necessarily have to pass through the inside of the stand column as in the above embodiment.

1: TV device, 2: display unit, 3: stand unit, 9: power receiving coil, 25: cable

Claims (6)

A display for displaying an image;
A stand unit for supporting the display unit;
A power receiving unit that is provided in the stand unit and generates electric power by resonating with a magnetic field generated from an external power transmission device and wirelessly propagating through a space;
A supply unit for supplying power generated by the power receiving unit to the display unit;
An image display device comprising:   The image display apparatus according to claim 1, wherein the power reception unit is provided so as to be adjustable in angle with respect to the stand unit.   The image display device according to claim 2, further comprising: a rotation mechanism that rotates the power reception unit about an axis perpendicular to and parallel to a base of the stand unit. A drive unit for driving the rotation mechanism unit;
An acquisition unit for acquiring a relative position between the power transmission device and the power reception unit;
Based on the relative position acquired by the acquisition unit, a control unit that controls the drive unit to adjust the angle of the power reception unit so that power supply efficiency from the power transmission device to the power reception unit is equal to or higher than a predetermined reference;
The image display apparatus according to claim 3, further comprising: The rotation mechanism unit can be manually rotated by a user,
An acquisition unit for acquiring a relative position between the power transmission device and the power reception unit;
Based on the relative position acquired by the acquisition unit, an instruction unit for instructing the user to adjust the angle of the power reception unit necessary to make the power supply efficiency from the power transmission device to the power reception unit equal to or higher than a predetermined reference;
The image display apparatus according to claim 3, further comprising: A stand for holding an image display device,
A base mounted or fixed on the surface on which the image display device is installed;
A support portion fixed to the base portion and capable of supporting the image display device;
A power receiving unit that is provided in the base and generates power by resonating with a magnetic field that is generated from an external power transmission device and wirelessly propagates through a space;
A supply unit capable of supplying the power generated by the power reception unit to the image display device;
A stand characterized by comprising.

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