Wireless charging device

Abstract

To provide a wireless charging device in which even if positional deviation of a placement position or tilting of a terminal device occurs during charging, the opposed attitude of a transmission side coil and a reception side coil can be easily maintained and the heat dissipation efficiency during charging can be improved to continue efficient charging.SOLUTION: A wireless charging device 10 includes: a bottom surface part 12 in which a transmission side coil C0 for wireless charging is included in a center region; and a standing wall part 14 that is provided around an outer edge region of the bottom surface part 12 and can support a device outer edge Ma of a terminal device equipped with a reception side coil C1. The standing wall part 14 has an inclined surface 18 that is downwardly inclined toward the center of the bottom surface part 12 from the outer edge side of the standing wall part 14. The inclined surface 18 supports the terminal device so as to form a space S between the terminal device and the bottom surface part 12 while the transmission side coil C0 and the reception side coil C1 face each other.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a wireless charging device.

Background Art

[0002] Some small terminal devices such as mobile phones, smartphones, and tablets are equipped with a wireless charging function. Wireless charging can generate an electric current in the power receiving coil on the terminal device side by electromagnetic induction by positioning the power receiving coil on the terminal device side in the magnetic flux generated by passing an electric current through the transmission side coil provided on the wireless charging device side. As a result, charging of the terminal device can be achieved simply by placing the terminal device on the wireless charging device. Such wireless charging devices are also being promoted for mounting on moving bodies in terms of their convenience and improved appearance due to being wireless. When a wireless charging device is mounted on a moving body (for example, a vehicle), the moving body sways or tilts depending on the driving state such as during acceleration and deceleration, when cornering, when turning right or left, or when driving on a rough road, and the position of the power receiving coil with respect to the transmission side coil may shift, resulting in a non-chargeable state. Therefore, a wireless charging device having a structure that can easily align the position of the power receiving coil with respect to the transmission side coil has been proposed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, for example, since a conventional wireless charging device is configured to place a terminal device (e.g., a smartphone) in close contact with the terminal placement surface of the wireless charging device, heat generated by the transmission-side coil and the power-receiving side coil during charging may heat the terminal device. As a result, there is a problem that an overheat prevention function of the terminal device, such as a charging stop function or a charging speed reduction function, may be activated, which may cause charging to be aborted or charging efficiency to be reduced.

[0005] An object of the present invention is to provide a wireless charging device that can easily maintain the facing posture between the transmission-side coil and the power-receiving side coil and improve the heat dissipation efficiency during charging, and can continue efficient charging even when the placement position of the terminal device is displaced or tilted during charging.

Means for Solving the Problems

[0006] To achieve the above object, a wireless charging device according to the present invention includes a bottom surface portion having a transmission-side coil for wireless charging built in a central region, and a standing wall portion provided around an outer edge region of the bottom surface portion and capable of supporting an outer edge portion of a terminal device provided with a power-receiving side coil. The standing wall portion has an inclined surface that slopes downward from the outer edge side of the standing wall portion toward the center of the bottom surface portion, and the inclined surface supports the terminal device so as to form a gap between the terminal device and the bottom surface portion with the transmission-side coil and the power-receiving side coil facing each other.

[0007] According to this configuration, the outer edge portion of the terminal device is supported on the inclined surface. Therefore, for example, even when the terminal device moves or tilts with respect to the bottom surface in a direction in which the power receiving coil is displaced with respect to the transmission side coil, the terminal device can slide down the downward inclined surface and move (return to the position) toward the center of the bottom surface by, for example, being given a small vibration or the like, and continue charging. Further, since the outer edge portion of the terminal device is supported on the downward inclined surface, a gap can be formed between the terminal device and the bottom surface in a state where the transmission side coil and the power receiving coil face each other. With this gap, heat conduction to the terminal device side can be reduced, and a structure that facilitates heat dissipation of heat that may be generated on the terminal device side can be easily realized. As a result, the terminal device can be maintained in a state suitable for charging, and good charging can be continued.

[0008] Further, the inclined surface of the wireless charging device according to the present invention may be configured such that, for example, a first downward inclination degree on the outer edge side of the standing wall portion is larger than a second downward inclination degree on the central side of the bottom surface portion.

[0009] According to this configuration, for example, when the terminal device is displaced in the outer edge direction, the outer edge portion of the terminal device on the side that has moved away from the center (transmission side coil) of the bottom surface is located on the inclined surface with the first downward inclination degree, and the outer edge portion on the opposite side of the terminal device on the side that has approached the center of the bottom surface is located on the second downward inclined surface with an inclination degree smaller than the first downward inclination degree. As a result, the outer edge portion that has moved to the side with the larger downward inclination degree easily slides down the inclined surface with the first downward inclination degree and easily returns to the center of the bottom surface. On the other hand, the outer edge portion located on the inclined surface with the second downward inclination degree whose downward inclination degree is smaller than the first downward inclination degree easily climbs the inclined surface with the second downward inclination degree and easily returns to the outer edge side of the bottom surface. That is, the terminal device can easily return to the center of the bottom surface and to a gap state suitable for the facing posture and heat dissipation between the transmission side coil and the power receiving coil.

[0010] Further, the standing wall portion of the wireless charging device according to the present invention may have, for example, a notch portion that notches a part of the inclined surface and communicates the gap with the space around the terminal device.

[0011] According to this configuration, for example, it becomes easier to release the heated air staying in the gap between the bottom surface portion and the terminal device to the space around the terminal device, suppress the temperature rise of the terminal device, and contribute to preventing a decrease in charging efficiency.

Effect of the Invention

[0012] According to the present invention, even when there is a displacement or inclination in the placement position of the terminal device during charging, it is easy to maintain the facing posture between the transmission-side coil and the power-receiving side coil, improve the heat dissipation efficiency during charging, and maintain the terminal device in a state suitable for charging, so that a wireless charging device capable of continuing efficient charging can be provided.

Brief Description of the Drawings

[0013]

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DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0015] FIG. 1 is an exemplary and schematic perspective view showing the external shape of a wireless charging device 10 according to the present embodiment. FIG. 2 is an exemplary and schematic top view showing the external shape of the wireless charging device 10. Further, FIG. 3 is an exemplary and schematic perspective view showing a chargeable state in which a smartphone M, which is an example of a terminal device, is placed on the wireless charging device 10. FIG. 4 is an exemplary and schematic cross-sectional view showing the facing relationship between the transmission-side coil C0 and the power-receiving side coil C1 when the smartphone M is placed on the wireless charging device 10. The terminal device may be other than the smartphone M as long as it has a wireless charging function and has an outer dimension that can be placed on the wireless charging device 10 and can take a charging posture. The terminal device may be, for example, a mobile phone, a tablet terminal, a wireless earphone (in a state where the charging case is stored), a wearable terminal, etc., and the same effects as those shown below can be obtained. In the present embodiment, an example of charging the smartphone M as the terminal device will be described.

[0016] The wireless charging device 10 is, for example, a tray-shaped structure composed of a bottom surface portion 12 and a standing wall portion 14. The wireless charging device 10 is a structure that can be formed of a resin material, and can be composed of, for example, a material with low friction and easy to finish the surface smoothly, such as ABS resin or PP resin. Note that as long as the wireless charging function can be realized and the placement surface (standing wall portion 14) can be made slippery, the material constituting the wireless charging device 10 can be appropriately selected. Also, the bottom surface portion 12 and the standing wall portion 14 may be integrally formed or may be configured by combining separate parts. When configured by separate parts, the materials of each may be the same or different.

[0017] The outer shape of the bottom surface portion 12 corresponds to the shape of the smartphone M (terminal device) to be charged, and can be, for example, a rectangle larger than the outer size of the smartphone M (terminal device). Note that it is sufficient that the smartphone M can be placed in the substantially central region of the bottom surface portion 12, and the outer shape of the wireless charging device 10 can be appropriately selected. In other embodiments, the outer shape of the bottom surface portion 12 may be, for example, a square, a circle, or an ellipse, and can be selected according to the mounting mode, design, etc. on the moving body side to be mounted. The wireless charging device 10 is mounted on a vehicle (private car, commercial vehicle, work vehicle, etc.), which is an example of a moving body. Note that the wireless charging device 10 can be mounted on a moving body that may shake, tilt, or bounce the mounted smartphone M from the placement surface and shift it from the optimal charging position due to specific moving states such as acceleration and deceleration during movement, curve movement, left and right turning, and vertical movement. The moving body is preferably one that can generate vibration due to a driving source for movement or the like in a normal state other than the above-mentioned specific moving states. The moving body may be, for example, a ship or an aircraft in addition to a vehicle.

[0018] As shown in FIGS. 1, 2, and 4, the bottom surface portion 12 of the wireless charging device 10 incorporates a transmission-side coil C0 for wireless charging at approximately the center of the bottom surface portion 12. As shown in FIG. 4, the transmission-side coil C0 receives power supply from an in-vehicle battery or the like via the control board 16, and generates a magnetic flux Φ when an electric current flows. By positioning the power-receiving side coil C1 on the smartphone M side within this magnetic flux Φ, an electric current flows through the power-receiving side coil C1 by electromagnetic induction. As a result, the smartphone M can be charged. That is, charging can be realized simply by placing the smartphone M on the wireless charging device 10.

[0019] The vertical wall portion 14 is provided around the outer edge region of the bottom surface portion 12, and includes a vertical wall portion 14 that can support the outer edge portion Ma of the device of the smartphone M equipped with the power-receiving side coil C1.

[0020] The vertical wall portion 14 has an inclined surface 18 that slopes downward from the outer edge side of the vertical wall portion 14 toward the center of the bottom surface portion 12 (the region where the transmission-side coil C0 is disposed). As shown in FIG. 4, the inclined surface 18 supports the smartphone M so as to form a gap S between the back surface MB of the smartphone M and the bottom surface portion 12 in a state where the transmission-side coil C0 on the bottom surface portion 12 side and the power-receiving side coil C1 on the smartphone M side face each other.

[0021] Further, the vertical wall portion 14 has a notch portion K that cuts out a part of the inclined surface 18 to communicate the gap S with the space around the smartphone M. That is, the notch portion K enables the air existing in the gap S to move from the gap S to the space around the smartphone M. Conversely, it also enables air to move from the space around the smartphone M to the gap S. As a result, it enables heat dissipation of the heat generated by the transmission-side coil C0 and the power-receiving side coil C1 during charging, or cooling (air cooling) of the wireless charging device 10 and the smartphone M. In the example shown in FIGS. 1 to 3, the notch portion K is formed in a portion corresponding to one of the two diagonals of the rectangular bottom surface portion 12. As a result, the vertical wall portion 14 is formed by substantially L-shaped vertical wall portions 14a and 14b. As shown in FIGS. 1, 2, etc., the vertical wall portions 14a and 14b extend in the direction of arrow X1-X2 and are inclined in the direction of arrow Y1-Y2, and extend in the direction of arrow Y1-Y2 and are inclined in the direction of arrow X1-X2. The inclined surfaces 18 are combined to form a substantially L shape. In this case, it is possible to set the formation region of the notch portion K large in one diagonal direction of the bottom surface portion 12, and effective heat dissipation (cooling) can be performed.

[0022] Incidentally, the smartphone M often has a lens CA of a rear camera at the left corner on the back MB side (the side opposite to the surface MF side with the display portion). And the lens CA often protrudes from the back MB. The notch portion K is formed at the corresponding position of the protruding lens CA so that the lens CA and the inclined surface 18 do not come into contact. That is, when the outer edge portion Ma of the smartphone M is supported by the vertical wall portion 14, it prevents the lens CA and the inclined surface 18 from coming into contact and the smartphone M from being placed in an inclined posture with respect to the bottom surface portion 12. As a result, the notch portion K also contributes to stabilizing the placement posture of the smartphone M with respect to the bottom surface portion 12. Note that the notch portion K is formed at one diagonal position of the bottom surface portion 12. Therefore, even when the smartphone M is placed on the wireless charging device 10 with the surface MF facing upward and rotated 180°, the lens CA will be located at the other notch portion K, and contact between the lens CA and the inclined surface 18 can be avoided.

[0023] FIG. 5 is an exemplary and schematic perspective view showing details of the downward inclined surface 18 that constitutes the vertical wall portion 14 of the wireless charging device 10. The inclined surface 18 is formed such that a first downward inclination R1 on the outer edge side (upper side of the inclined surface) of the vertical wall portion 14 is greater than a second downward inclination R2 on the central side (lower side of the inclined surface) of the bottom surface portion 12. In the case of FIG. 5, the inclined surface 18 is an example having a three-stage structure in which a plane 18a arranged with a first downward inclination R1 having a large (steep) inclination, a plane 18b arranged with a second downward inclination R2 having an inclination smaller than the first downward inclination R1 (gentle), and a plane 18c arranged with a third inclination R3 which is an intermediate inclination therebetween are connected.

[0024] FIG. 6 is an exemplary and schematic cross-sectional view showing a state in which the placement position is shifted from the center of the bottom surface portion 12 to the outer edge side (upper side of the inclined surface) of the vertical wall portion 14 when the smartphone M is placed on the wireless charging device 10. Note that in FIG. 6 and FIGS. 7 and 8 shown below, the transmission-side coil C0 and the control board 16 are not shown.

[0025] In the case of FIG. 6, one device outer edge portion Ma1 of the smartphone M is shifted in the direction of arrow Y1 and climbs the plane 18a arranged with the first downward inclination R1 on the outer edge side (upper side of the inclined surface). Therefore, the other device outer edge portion Ma2 of the smartphone M is shifted in the direction of arrow Y1 and descends the plane 18b arranged with the second downward inclination R2 on the central side (lower side of the inclined surface) of the bottom surface portion 12. Such a displacement operation of the smartphone M in the wireless charging device 10 may be caused by the shaking, tilting, bouncing, etc. of the vehicle due to changes in the driving conditions of the vehicle equipped with the wireless charging device 10, for example, during acceleration and deceleration, during curve driving, during right and left turns, and during driving on a rough road. In this case, the smartphone M may shift from the central region of the bottom surface portion 12. That is, the opposing position of the power receiving coil C1 may shift from the generation center of the magnetic flux Φ of the transmission-side coil C0 shown in FIG. 4, and an induced current due to electromagnetic induction may not flow through the power receiving coil C1, resulting in inability to charge, or the amount of the induced current may be small and the charging efficiency may decrease.

[0026] As described above, the standing wall portion 14 provided around the outer edge region of the bottom surface portion 12 is formed such that the first downward slope R1 on the outer edge side is larger (steeper) than the second downward slope R2 on the central side of the bottom surface portion 12. Therefore, in the smartphone M, the outer edge portion Ma1 side of the device located on the plane 18a with the first downward slope R1, which has a large slope and is a high region with respect to the bottom surface portion 12, is more likely to slide down the inclined surface 18 toward the arrow Y2 side than the outer edge portion Ma2 side of the device located on the plane 18b with the second downward slope R2, which has a small slope and is a low region with respect to the bottom surface portion 12. Conversely, in the smartphone M, the outer edge portion Ma2 side of the device located on the plane 18b with the second downward slope R2, which has a small slope and is a low region with respect to the bottom surface portion 12, is more likely to climb the inclined surface 18 in the direction of the arrow Y2 than the outer edge portion Ma1 side of the device located on the plane 18a with the first downward slope R1, which has a large slope and is a high region with respect to the bottom surface portion 12. As a result, for example, when vibrations or the like during vehicle travel are applied, the opposing outer edge portions Ma of the smartphone M easily slide on the inclined surface 18, and the central portion (power receiving side coil C1) of the smartphone M easily returns to the central portion (transmission side coil C0) of the bottom surface portion 12. That is, as shown in FIG. 7, the mounting posture of the smartphone M easily returns to a state where the power receiving side coil C1 and the transmission side coil C0 face each other, and the transmission side coil C0 is positioned within the magnetic flux Φ generated by the power receiving side coil C1, automatically returning to a good chargeable state. In addition, with the mounting position of the smartphone M with respect to the wireless charging device 10 being in an optimal position for charging, the gap S between the bottom surface portion 12 and the back surface MB of the smartphone M is also automatically formed to have a substantially uniform width. That is, it becomes a state where heat dissipation during charging can be performed well.

[0027] Note that, as described above, the wireless charging device 10 can automatically return to a placement position suitable for wireless charging triggered by vibrations or the like during the movement of a moving body (such as a vehicle). In other embodiments, when charging is interrupted or the charging efficiency falls below an acceptable range, it is determined that the placement position of the smartphone M has deviated from a position suitable for charging. For example, vibrations may be intentionally applied to the wireless charging device 10 by a vibration generating unit such as a built-in vibrator. In this case, regardless of the presence or absence of movement of the moving body, the smartphone M may be made to slide easily on the inclined surface 18 and be forcibly returned to the central region.

[0028] Note that the external dimensions (width, length, etc.) of the smartphone M may vary depending on the model. Since the vertical wall portion 14 of the wireless charging device 10 of the present embodiment is composed of the inclined surface 18, as shown in FIG. 8, the smartphone M1 with a small external dimension is positioned on the inclined surface closer to the bottom surface portion 12 (the lower inclined surface). Also, the smartphone M2 with a large external dimension is positioned on the inclined surface farther from the bottom surface portion 12 (the higher inclined surface). In any case of the external dimensions, as described above, when the smartphone M is displaced from the center of the bottom surface portion 12 due to the shaking or tilting of the vehicle, etc., it can easily return to the central region, that is, the position where the power receiving coil C1 and the transmission coil C0 face each other. Also, in any case of the external dimensions, a gap S suitable for heat dissipation is formed. Note that the smartphone M with a large external dimension may generate more heat during charging than the smartphone M with a small external dimension. However, as the external dimension increases, the width of the gap S (the distance from the bottom surface portion 12 to the back surface MB of the smartphone M) increases, so the heat dissipation effect also improves. Note that, as shown in FIG. 5, a vertical wall portion W is formed at the uppermost part of the vertical wall portion 14. The vertical wall portion W is provided to block the movement so that the smartphone M does not jump out of the wireless charging device 10 when the smartphone M is displaced due to the shaking or tilting of the vehicle, etc. Also, the vertical wall portion W has a function of pushing the smartphone M back to the center of the bottom surface portion 12 when the outer edge portion Ma of the device of the smartphone M comes into contact. A cushioning material such as sponge may be provided on the vertical wall portion W.

[0029] FIG. 9 and FIG. 10 are exemplary and schematic explanatory diagrams showing other external shapes of the wireless charging device. Specifically, the shape of the standing wall portion is different from that of the standing wall portion 14 of the wireless charging device 10 shown in FIG. 1 and the like. Note that the functions of the bottom surface portion 12 and the standing wall portion 14A (14B) in the wireless charging device 10A shown in FIG. 9 and the wireless charging device 10B shown in FIG. 10 are substantially the same as those of the bottom surface portion 12 and the standing wall portion 14 of the wireless charging device 10 shown in FIG. 1 and the like, and the description will be omitted as appropriate. In FIGS. 9 and 10, the wireless charging devices 10A and 10B are each illustrated with a top view and a perspective view arranged side by side.

[0030] The wireless charging device 10A shown in FIG. 9 is different from the wireless charging device 10 shown in FIG. 1 in that the standing wall portions 14A are arranged at the four corners of the bottom surface portion 12. The inclined surfaces 18 of the standing wall portions 14A (standing wall portions 14Aa to 14Ad) are, similar to the standing wall portion 14 of the wireless charging device 10 shown in FIGS. 1, 2 and the like, inclined surfaces 18 extending in the direction of arrow X1 - X2 and inclined in the direction of arrow Y1 - Y2, and inclined surfaces 18 extending in the direction of arrow Y1 - Y2 and inclined in the direction of arrow X1 - X2 are combined to form a substantially L-shaped configuration. That is, each of the inclined surfaces 18 is configured to slope downward toward the central region of the bottom surface portion 12.

[0031] In the case of the wireless charging device 10, L-shaped standing wall portions 14a and 14b are formed, which are cut out by a notch portion K having a function of avoiding contact between the lens CA protruding from the back surface MB of the smartphone M and the standing wall portion 14. By the way, the smartphone M may be used with a cover attached to cover the back surface MB. In this case, the cover may reduce the amount of protrusion of the lens CA from the surface of the cover or eliminate the influence of the protrusion. That is, the back surface side of the smartphone M with the cover attached may be flattened. In this case, there is no need to provide the notch portion K in the corresponding portion of the lens CA. Therefore, in the case of the wireless charging device 10A, the notch portions K are provided at four locations, i.e., the central portions of the long side and the short side of the bottom surface 12, to form L-shaped standing wall portions 14Aa, 14Ab, 14Ac, and 14Ad. In this case, each of the standing wall portions 14Aa to 14Ad can support the outer edge portion Ma of the device of the smartphone M. As a result, for example, even when the smartphone M rotates along the back surface MB when it is displaced, each outer edge portion Ma of the device has an improved possibility of being continuously supported by one of the standing wall portions 14Aa to 14Ad. That is, the outer edge portion Ma of the device is suppressed from falling off the inclined surface 18, and the posture return operation to the center of the bottom surface 12 is likely to be performed smoothly. Therefore, it becomes easier to maintain the placement position of the smartphone M in the central region of the bottom surface 12. In the case of the wireless charging device 10A, since the opposing notch portions K are formed in a straight line, air can pass through smoothly, and the heat dissipation effect (cooling effect) can be improved. Also, as described above, since the standing wall portions 14Aa to 14Ad are formed at the four corners of the bottom surface 12, the smartphone M can be stably supported. Therefore, the length settings of each of the standing wall portions 14Aa to 14Ad in the directions of the arrows X1-X2 and Y1-Y2 can be appropriately changed within a range where the smartphone M can be stably supported, contributing to an improvement in the degree of design freedom.

[0032] Thus, also in the wireless charging device 10A, similar to the wireless charging device 10, even when there is a displacement or inclination in the placement position of the smartphone M during charging, it is easy to maintain the facing posture between the transmission-side coil C0 and the power-receiving side coil C1, and the heat dissipation efficiency during charging is improved, so that the smartphone M can be maintained in a state suitable for charging, and efficient charging can be continued.

[0033] The wireless charging device 10B shown in FIG. 10 is similar to the wireless charging device 10A shown in FIG. 9 in that the vertical wall portions 14B are arranged at the four corners of the bottom surface portion 12. Different from the wireless charging device 10 shown in FIG. 1 and the wireless charging device 10A shown in FIG. 9, in which the inclined surfaces 18 of the vertical wall portions 14B (vertical wall portions 14Ba to 14Bd) are composed of a combination of two types of inclined surfaces facing in the directions of arrows X1 - X2 and Y1 - Y2, the inclined surface 18 of the vertical wall portion 14B is composed of a single downward inclined surface facing the central region of the bottom surface portion 12. Further, as shown in FIG. 10, the notch portion K is formed only in the direction of arrow Y1 - Y2 of the vertical wall portion 14 and is not formed in the direction of arrow X1 - X2. Similar to the wireless charging device 10A, the wireless charging device 10B also allows charging by placing the smartphone M with the cover attached, and the formation position of the notch portion K does not correspond to the position of the lens CA of the smartphone M.

[0034] The function of supporting the smartphone M by each inclined surface 18 of the vertical wall portion 14B in the wireless charging device 10B, the function of returning the power-receiving side coil C1 and the transmission-side coil C0 to the facing state, and the heat dissipation (cooling) function are the same as those of the other wireless charging devices 10 and 10A, and the same effects can be obtained.

[0035] Also, as shown in FIG. 10, the notch K of the wireless charging device 10B is provided at the center of the long side of the bottom surface portion 12 (the side in the direction of arrows Y1 - Y2), and vertical wall portions 14Ba, 14Bb, 14Bc, and 14Bd are formed at the four corners. In this case, similar to the wireless charging device 10A, it becomes possible to support the outer edge portion Ma of the smartphone M by each of the vertical wall portions 14Ba to 14Bd. As a result, for example, even when the placement position of the smartphone M is displaced and rotates along the back surface MB, the possibility that each outer edge portion Ma continues to be supported by any of the vertical wall portions 14Ba to 14Bd is improved. That is, the outer edge portion Ma is suppressed from falling off the inclined surface 18, and the posture return operation to the center of the bottom surface portion 12 is likely to be performed smoothly. Therefore, it becomes easier to maintain the placement position of the smartphone M in the central region of the bottom surface portion 12. In the case of the wireless charging device 10B, the vertical wall portions 14Ba, 14Bb and 14Bc, 14Bd connected in the direction of arrows X1 - X2 are formed to support the smartphone M. Therefore, the notch K can be set wider than the wireless charging devices 10 and 10A in the longitudinal direction (the direction of arrows Y1 - Y2) of the bottom surface portion 12. As a result, effective heat dissipation (cooling) can be performed. Further, the shape of the vertical wall portion 14 of the wireless charging device 10B is simpler than the shape of the vertical wall portion 14 of the wireless charging devices 10 and 10A, and the ease of design and formation can be improved compared to the wireless charging devices 10 and 10A.

[0036] (Operation and Effect of this Embodiment) As described above, the wireless charging device 10(10A, 10B) according to the present embodiment includes a bottom surface portion 12 that houses the transmission-side coil C0 of wireless charging in the central region, and a standing wall portion 14 that is provided around the outer edge region of the bottom surface portion 12 and can support the outer edge portion Ma of the smartphone M (terminal device) provided with the power receiving-side coil C1. And the standing wall portion 14 has an inclined surface 18 that slopes downward from the outer edge side of the standing wall portion 14 toward the center of the bottom surface portion 12, and the inclined surface 18 supports the smartphone M so as to form a gap S between the smartphone M and the bottom surface portion 12 with the transmission-side coil C0 and the power receiving-side coil C1 facing each other. In this way, the outer edge portion Ma of the smartphone M (terminal device) is supported by the inclined surface 18. Therefore, for example, even when the smartphone M moves or tilts with respect to the bottom surface portion 12 in a direction in which the power receiving-side coil C1 is displaced with respect to the transmission-side coil C0, the smartphone M can slide down the downward inclined surface 18 and move (return to the original position) toward the center of the bottom surface portion 12 to continue charging. Further, since the outer edge portion Ma of the smartphone M is supported by the downward inclined surface 18, a gap S can be formed between the smartphone M and the bottom surface portion 12 with the transmission-side coil C0 and the power receiving-side coil C1 facing each other. The gap S can reduce heat conduction to the smartphone M side and facilitate heat dissipation of heat that may be generated on the smartphone M side. As a result, the smartphone M can be maintained in a state suitable for charging, and good charging can be continued. In the case of the wireless charging device 10(10A, 10B) of the present embodiment, since it is easy to oppose the center position of the power receiving-side coil C1 to the center position of the transmission-side coil C0, it is not necessary to widen the arrangement region of the transmission-side coil C0 (for example, arrange a plurality of transmission-side coils). For example, it is sufficient to arrange one transmission-side coil C0 corresponding to the power receiving-side coil C1. As a result, it is possible to contribute to cost reduction of the wireless charging device 10(10A, 10B).

[0037] Further, the inclined surface 18 of the wireless charging device 10(10A, 10B) according to the present embodiment may be configured such that, for example, a first downward inclination R1 on the outer edge side of the vertical wall portion 14 is greater than a second downward inclination R2 on the central side of the bottom surface portion 12. According to this configuration, for example, when the smartphone M is displaced in the outer edge direction, the outer edge portion Ma of the smartphone M on the side that has moved away from the center (transmission-side coil C0) of the bottom surface portion 12 is located on the inclined surface with the first downward inclination R1, and the outer edge portion Ma on the opposite side of the smartphone M on the side closer to the center of the bottom surface portion 12 is located at the second downward inclination R2 with a smaller inclination than the first downward inclination R1. As a result, the outer edge portion Ma that has moved to the side with the larger downward inclination easily slides down the inclined surface with the first downward inclination R1 and easily returns to the center of the bottom surface portion 12. On the other hand, the outer edge portion Ma located on the inclined surface with the second downward inclination R2 that is smaller than the first downward inclination R1 easily climbs the inclined surface with the second downward inclination R2 and easily returns to the outer edge side of the bottom surface portion 12. That is, the smartphone M can be easily returned to the center of the bottom surface portion 12 and the state of the gap S suitable for the facing posture and heat dissipation between the transmission-side coil C0 and the power reception-side coil C1.

[0038] Further, the vertical wall portion 14 of the wireless charging device 10(10A, 10B) according to the present invention may have, for example, a notch portion K that cuts out a part of the inclined surface 18 and communicates the gap S with the space around the smartphone M. According to this configuration, for example, it becomes easier to release the heated air staying in the gap S between the bottom surface portion 12 and the smartphone M to the space around the smartphone M, which can contribute to suppressing the temperature rise of the smartphone M and preventing a decrease in charging efficiency.

[0039] As described above, the embodiments of the present invention have been described. However, the above-described embodiments are presented as examples and are not intended to limit the scope of the present invention. This novel embodiment can be implemented in various other forms. Also, various omissions, replacements, and changes can be made without departing from the gist of the invention. Further, this embodiment is included in the scope and gist of the invention and is included in the invention described in the claims and its equivalent scope.

Explanation of Symbols

[0040] 10 Wireless charging device 12 Bottom part 14 Upright wall part 16 Control board 18 Inclined surface C0 Transmission-side coil C1 Power-receiving side coil K Notch M Smartphone (terminal device) Ma Outer edge of the device R1 First downward slope R2 Second downward slope S Gap

Claims

1. A bottom surface portion having a wireless charging transmission-side coil built in the central region, A vertical wall portion provided around the outer edge region of the bottom surface portion and capable of supporting the outer edge portion of a terminal device provided with a power receiving-side coil, Comprising, The vertical wall portion has an inclined surface that slopes downward from the outer edge side of the vertical wall portion toward the center of the bottom surface portion, and the inclined surface supports the terminal device so as to form a gap between the terminal device and the bottom surface portion with the transmission-side coil and the power receiving-side coil facing each other. A wireless charging device.

2. The wireless charging device according to claim 1, wherein the inclined surface has a first downward slope on the outer edge side of the vertical wall portion that is greater than a second downward slope on the central side of the bottom surface portion.

3. The wireless charging device according to claim 1, wherein the vertical wall portion has a notch portion that cuts out a part of the inclined surface and communicates the gap with the space around the terminal device.

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