Magnetic force adjustment mechanism and disconnected charging device

Abstract

To provide a magnetic force adjusting mechanism in which, in a held state, a strong magnetic force is generated, and, when unsticking is performed, an operation on a holder or a zipper side is made unnecessary, and then, the magnetic force can be weakened.SOLUTION: A magnetic force adjusting mechanism includes a mobile body panel 20 including a permanent magnet 22 and a rotary body 24, a mobile body base 30 that guides movement of the mobile body panel 20 in a thickness direction, and a mobile body case 40 which has a suction support surface 42a for an item to be held, and an inclination surface 46 extending along the thickness direction of a plate constituting the suction support surface 42a, and in which the suction support surface 42a can be rotated with respect to the mobile body base 30. The mobile body panel 20 is disposed between the mobile body base 30 and the mobile body case 40. When the mobile body case 40 rotates, the distance between the suction support surface 42a and the permanent magnet 22 changes.SELECTED DRAWING: Figure 3

Description

Technical Field

[0005]

[0001] The present invention relates to an adsorption device by magnetic force, and particularly to a magnetic force adjustment mechanism suitable for application to a holder of a portable terminal that frequently attaches and detaches an adsorbed object, and a non-connection type charging device having this magnetic force adjustment mechanism.

Background Art

[0002] In recent years, with the rapid spread of portable terminals such as high-performance mobile phones (so-called smartphones) and tablet terminals, various functions have been added to each terminal, and accessories for retrofitting have also become more abundant. These portable terminals have increasingly been supported by holders for various purposes such as self-photography, fixing, and temporary placement. Conventional holders mainly have an instruction form in which the outer edge of a portable terminal is sandwiched by a plurality of claws, but in recent years, as disclosed in Patent Document 1, there has been an increasing number of holders that hold or support a support state by the magnetic force of a permanent magnet.

[0003] However, adsorption and holding by a permanent magnet have problems such that when the magnetic force is weak, displacement and dropping are likely to occur, and when the magnetic force is strong, peeling from the holder does not occur smoothly.

[0004] As a technique for adsorbing, holding, and detaching a metal member by the magnetic force of a permanent magnet, a magnet chuck as disclosed in Patent Document 2 is known. The magnet chuck disclosed in Patent Document 2 includes a cylinder having an opening on an adsorption surface and a piston that slides in this cylinder, and by disposing a permanent magnet at the tip of the piston, the permanent magnet is brought close to or separated from the permanent magnet adsorption surface in accordance with the operation of the piston. According to a magnet chuck having such a configuration, when the permanent magnet is close to the adsorption surface, a strong magnetic force (adsorption force) can be obtained, and when separated, the magnetic force generated on the adsorption surface becomes weak, and the adsorbed object can be peeled off.

[0005] However, a magnetic chuck with this configuration requires a mechanism to operate the piston with the magnet attached (an air supply mechanism in Patent Document 1), resulting in a complex structure and requiring operation on the holder (magnetic chuck) side. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Special Publication No. 2017-537360 [Patent Document 2] Japanese Utility Model Publication No. 51-102174 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Therefore, the present invention aims to provide a magnetic force adjustment mechanism that generates a strong magnetic force when held, and that allows the magnetic force to be weakened when detached, without requiring any operation on the holder or chuck side, and a disconnected charging device having this magnetic force adjustment mechanism. [Means for solving the problem]

[0008] A magnetic force adjustment mechanism for achieving the above objective comprises a movable panel having a rotating body that can roll in a direction along the surface of the plate, with a permanent magnet arranged on one side of the plate body; a movable base that guides the movable panel to move in the thickness direction and restricts movement in directions other than the thickness direction; a movable case having an adsorption support surface for holding an object and an inclined surface along the thickness direction of the plate constituting the adsorption support surface, and enabling the adsorption support surface to move relative to the movable base in a direction along the surface of the plate of the adsorption support surface, wherein the movable panel is arranged between the movable base and the movable case, and as the movable case moves, the rotating body rolls along the inclined surface, and the distance between the adsorption support surface and the permanent magnet changes.

[0009] Furthermore, in a magnetic force adjustment mechanism having the above-described characteristics, the movement of the movable body case is rotational, and the inclined surface is preferably positioned on the circumference of a circle with the rotation center of the rotational motion as the base point. With these characteristics, the positional relationship between the movable body case and the movable body base will not be misaligned. Also, since the movement is not linear, the risk of malfunction due to vibrations, etc., is reduced.

[0010] Furthermore, in a magnetic force adjustment mechanism having the above-described features, it is preferable to provide a biasing means between the movable panel and the movable base that biases the movable panel toward the movable case. With this feature, after the object to be held is detached, the movable case will automatically return to a position where the magnetic force of the suction support surface is stronger.

[0011] Furthermore, in a magnetic force adjustment mechanism having the above-described features, it is preferable to provide a damper between the movable panel and the movable case that generates a force in a direction that opposes the rotational movement of the movable case. With these features, the time required from when the object to be held is detached until the movable case returns to a position where the magnetic force of the suction support surface becomes stronger can be delayed. This prevents the detached object from being reattached to the suction support surface.

[0012] Furthermore, the disconnected charging device according to the present invention for achieving the above objective is characterized by having any of the above-described magnetic force adjustment mechanisms and comprising a coil for disconnected charging between the mobile panel and the mobile case. [Effects of the Invention]

[0013] The magnetic force adjustment mechanism and disconnected charging device, having the features described above, generate a strong magnetic force when held, and when detached, the magnetic force can be weakened without requiring any operation on the device side. [Brief explanation of the drawing]

[0014] [Figure 1] This is a side view showing the external configuration of a disconnected charging device according to an embodiment. [Figure 2] This is a plan view showing the external configuration of a disconnected charging device according to an embodiment. [Figure 3] This is an exploded perspective view of a disconnected charging device according to an embodiment. [Figure 4] This is a diagram showing the AA cross-section in Figure 2. [Figure 5] This is a conceptual diagram illustrating the relationship between a movable panel equipped with a rotating body and an inclined surface. [Figure 6] This is an exploded perspective view illustrating the operation of a disconnected charging device according to an embodiment. [Figure 7] This is a cross-sectional view illustrating the operation of a disconnected charging device according to an embodiment. [Modes for carrying out the invention]

[0015] Hereinafter, embodiments relating to the magnetic force adjustment mechanism and the disconnected charging device of the present invention will be described in detail with reference to the drawings. Note that the embodiments described below are some of the preferred embodiments for carrying out the present invention, and even if some of the configuration is changed, it can still be considered part of the present invention, as long as the effects are achieved.

[0016] [composition] First, the configuration of the disconnected charging device having a magnetic force adjustment mechanism according to this embodiment will be described with reference to Figures 1 to 5. In the drawings, Figure 1 is a side view showing the external configuration of the disconnected charging device according to the embodiment, and Figure 2 is a plan view thereof. Figure 3 is an exploded perspective view of the disconnected charging device according to the embodiment. Figure 4 is a diagram showing the AA cross-section in Figure 2. Furthermore, Figure 5 is a conceptual diagram for explaining the relationship between the movable panel with a rotating body and the inclined surface.

[0017] The non-contact charging device 10 according to this embodiment is a charging device that uses a high-functional mobile phone (so-called smartphone) equipped with a non-contact charging function and a function of holding or supporting a support state by magnetic force (magnetic adsorption function), a tablet terminal, or the like as a portable terminal 100 to be held. Note that the magnetic adsorption function may be a retrofitted function using after-parts such as so-called accessories.

[0018] The non-contact charging device 10 according to this embodiment has a magnetic force adjustment mechanism mainly composed of a moving body panel 20, a moving body base 30, and a moving body case 40, and is configured by attaching a coil 28 and a substrate 34 thereto. The moving body panel 20 is a plate body that moves in the arrangement direction (thickness direction) of both between the moving body base 30 and the moving body case 40, the details of which will be described later. As shown in the perspective view in FIG. 3, the moving body panel 20 according to this embodiment has a substantially circular planar shape of the plate surface, and has a through hole 20a at the center of the plate surface and a notch 20b at the outer edge of the plate surface, respectively. The through hole 20a is for inserting a rotating shaft 48 provided in the moving body case 40, the details of which will be described later, and the notch 20b is for arranging a damper 26.

[0019] The moving body panel 20 according to this embodiment includes a permanent magnet 22, a rotating body 24, a damper 26, a coil 28, and an iron plate 28a. The permanent magnet 22 is an element that acts on an adsorption support surface 42a provided in the moving body case 40. In this embodiment, the permanent magnet 22 is formed in an annular shape and is arranged along the outer edge on one surface of the moving body panel 20. Here, the annular shape of the permanent magnet 22 is due to the shape of the magnetic adsorption portion in the portable terminal 100. Therefore, when applying a magnetic force adjustment mechanism other than the non-contact charging device 10, it is not necessary to form the permanent magnet 22 in an annular shape.

[0020] The rotating body 24 is an element for moving the movable body panel 20 along the inclined surface 46 that constitutes the movable body case 40. At least three rotation shafts 20c are extended radially from the outer edge of the movable body panel 20, with a through hole 20a, which serves as the rotation center, as the pivot point. The rotating body 24 is positioned to be rotatable with respect to these rotation shafts 20c as the pivot point. The specific configuration of the rotating body 24 is not specified, but any configuration that can roll against the inclined surface 46, such as a bearing or a resin sleeve, would suffice. It is preferable that the multiple rotation shafts 20c be spaced evenly in the circumferential direction of the movable body panel 20. This makes it easier to maintain balance when supporting the movable body panel 20 and allows the movable body panel 20 to move in parallel.

[0021] The damper 26 is an element that generates a force in a direction that hinders the movement of the movable panel 20 (in this embodiment, movement in the rotational direction). In this embodiment, the movable panel 20 is restricted from moving in directions other than the thickness direction by the movable base 30, which will be described in detail later. Therefore, when the rotating body 24 comes into contact with the inclined surface 46 by rotating the movable case 40, which will be described in detail later later, the movable panel 20 moves either away from or closer to the plate surface of the movable case 40 that constitutes the suction support surface 42a.

[0022] In this embodiment, the mobile panel 20 is subjected to a force that presses it toward the mobile case 40 with the mobile base 30 as the pivot point, due to the action of the biasing means 38, which will be described in detail later. Therefore, even if the rotation of the mobile case 40 causes the mobile panel 20 to separate from the bottom plate 42 of the mobile case 40 and the magnetic force to weaken, the moment the portable terminal 100, which is the object being held, is pulled away from the mobile case 40, the mobile panel 20 may be pushed back by the action of the biasing means 38, and a strong magnetic force may be restored. In this way, if a strong magnetic force is restored the moment the portable terminal 100 is pulled away, the portable terminal 100, which was supposed to have been pulled away, may be attracted to the mobile case 40 again and become attached.

[0023] The damper 26 according to this embodiment is a rotary damper that performs its function by engaging with a rack gear 50 provided on the mobile case 40, and can slow down the speed at which the mobile case 40 returns to its original state, that is, the speed at which the mobile panel 20 approaches the mobile case 40. This allows for an appropriate amount of time to be allowed between the removal of the portable terminal 100 and the recovery of the magnetic force, making the removal operation of the portable terminal 100 easier.

[0024] The coil 28 is an element that enables the disconnected charging function in the portable terminal 100. Therefore, it is preferable that the coil 28 be configured to generate electromagnetic induction in the target device in the portable terminal 100. In the configurations shown in Figures 3 to 5, the wires constituting the coil 28 are formed to be arranged in a planar spiral shape. The coil 28 is connected to the circuit board 34, which will be described in detail later, and is supplied with the power necessary for charging the portable terminal 100.

[0025] The iron plate 28a is an element for shielding the magnetic field lines generated by the permanent magnet 22 and the coil 28, and in this embodiment, it is placed between the coil 28 and the mobile body panel 20. With this configuration, there is no risk of magnetic field lines acting on the substrate 34 placed on the mobile body base 30 or on external elements (not shown) placed on the mobile body base 30 side and causing adverse effects.

[0026] The mobile base 30, in the disconnected charging device 10 according to this embodiment, serves as a base for supporting the portable terminal 100 and is also an element for supporting the mobile panel 20 described above. The mobile base 30 has side walls 32a on one and the other surface of a plate-shaped (disc-shaped) mobile base body 32, forming concave housing portions. One surface of the mobile base body 32 is the surface facing the mobile panel 20, and a substrate 34 is placed in the housing portion formed on the other surface, and a cover 36 is provided to close the housing portion.

[0027] As described above, a biasing means 38 is provided between one side of the mobile base 30 and the mobile panel 20, which is responsible for pressing the mobile panel 20 toward the mobile case 40. By providing the biasing means 38, the mobile panel 20 can be automatically moved to its initial position (a position close to the suction support surface 42a). Therefore, when the portable terminal 100 is pulled away from the suction support surface 42a, the mobile panel 20 automatically returns to its initial position, and in the absence of operation, a strong magnetic force acts on the suction support surface 42a.

[0028] Furthermore, the substrate 34 placed on the mobile base 30 only needs to have a function primarily of supplying power to the coil 28, as described above. In addition, the outer edge of the mobile base body 32 according to this embodiment is provided with a notch 32b to avoid interference with the damper 26 provided on the mobile panel 20 and the rack gear 50 provided on the mobile case 40. With this configuration, the thickness required to avoid interference between each element is eliminated, making it possible to reduce the overall thickness of the magnetic force adjustment mechanism. Furthermore, it is preferable to provide a guide (not shown) on the mobile base 30 to restrict the movement of the mobile panel 20 in directions other than the thickness direction. This is to efficiently control the movement of the mobile panel 20 caused by the movement of the mobile case 40.

[0029] The mobile body case 40 is an element having an adhesive support surface 42a that contacts the portable terminal 100. The mobile body case 40 is configured to be cup-shaped by a bottom plate 42 that constitutes the adhesive support surface 42a and a side wall 44 formed along the outer edge of the bottom plate 42. One side of the bottom plate 42, which is positioned externally, serves as the adhesive support surface 42a, and the mobile body panel 20 is positioned on the other side, which is positioned internally. In this embodiment, the mobile body case 40 has a circular bottom plate 42. In addition, multiple inclined surfaces 46 are provided on the inside of the side wall 44, to which the rotating body 24 of the mobile body panel 20 makes rolling contact. Furthermore, a rotation axis 48 is provided at the center of the other side of the bottom plate 42.

[0030] In this embodiment, the movement of the movable panel 20 is a rotation around the rotation axis 48, and therefore the inclined surface 46 is also formed in an arc shape along the circumference of a circle with the center (rotation axis 48) of the movable case 40 as the pivot point. Furthermore, as described above, a rack gear 50 that meshes with the pinion gear, which is a damper 26, provided on the side wall 44 of the movable case 40 or on a part of the inclined surface 46 is provided. The rack gear 50 provided on the movable case 40 is configured to have a width (thickness) corresponding to the movement distance of the movable panel 20 so that the meshing with the pinion gear (damper 26) does not disengage even when the movable panel 20 moves in the thickness direction.

[0031] Furthermore, in the disconnected charging device 10 according to this embodiment, the plan view of the mobile base 30, mobile panel 20, and mobile case 40 is circular, and the movement of the mobile case 40 is rotational with respect to the rotation axis 48. Therefore, even if the mobile case 40 is moved, the positional relationship between the mobile case 40 and the mobile base 30 does not shift. In addition, by making the movement rotational, unlike linear movement, there is less risk of malfunction due to vibration, etc.

[0032] [Effect] The disconnected charging device 10 described above performs the following functions. First, the fixing (adsorption holding) and charging of the portable terminal 100 will be explained. In order to fix and charge the portable terminal 100, the back surface (the surface with magnetic attraction function) of the portable terminal 100 is brought close to the disconnected charging device 10 to which the mobile base 30 is fixed while power is supplied. When the portable terminal 100 is brought close to the attraction support surface 42a, the portable terminal 100 is attracted and fixed to the attraction support surface 42a by the action of the permanent magnet 22 provided on the mobile panel 20. Once the portable terminal 100 is attracted and fixed to the mobile case 40 by the magnetic attraction function, disconnected charging (non-contact charging) is started by the action of the coil 28, which is supplied with power via the circuit board 34.

[0033] Next, the operation of detaching the portable terminal 100 from the disconnected charging device 10 will be described. When detaching the portable terminal 100 from the disconnected charging device 10, the portable terminal 100 is rotated so that the rotation axis 48 of the mobile case 40 becomes the pivot point. A frictional force is generated between the suction support surface 42a of the mobile case 40 and the back surface of the portable terminal 100. Therefore, when the portable terminal 100 is rotated, the mobile case 40 also rotates with it. Here, since the mobile base 30 is fixed, a relative twist occurs between the mobile base 30 and the mobile case 40. As a result of this operation, when the mobile case 40 twists by an angle θ relative to the mobile base 30, the rotating body 24 provided on the mobile panel 20 rolls up the inclined surface 46 provided on the mobile case 40.

[0034] As the rotating body 24 ascends the inclined surface 46, the mobile panel 20 moves away from the bottom plate 42 that constitutes the suction support surface 42a (in Figures 6 and 7, the distance the mobile panel 20 moves is denoted as d). The permanent magnets 22 that generate magnetic force on the suction support surface 42a are provided on the mobile panel 20. Therefore, as the mobile panel 20 moves away from the suction support surface 42a (bottom plate 42), the magnetic field lines acting on the suction support surface 42a are reduced, and the magnetic force of the suction support surface 42a decreases. This makes it easier to detach the portable terminal 100 from the suction support surface 42a.

[0035] When the portable terminal 100 is pulled away from the suction support surface 42a, the force holding the mobile body case 40, which was fixed (maintained) in a rotating state, is lost. The mobile body panel 20 is pressed against the mobile body case 40 by the action of the biasing means 38. When the mobile body panel 20 receives a force that pushes it towards the mobile body case 40, the rotating body 24 provided on the mobile body panel 20 rolls along the slope of the inclined surface 46, in the direction of going down the inclined surface 46. As a result, the mobile body case 40 rotates to correct the twist that had occurred between it and the mobile body base 30. Due to the rotation of the mobile body case 40, the mobile body panel 20 comes closer to the bottom plate 42 of the mobile body case 40, and the magnetic force generated on the suction support surface 42a becomes stronger. Here, a damper 26 and a rack gear 50 are present between the mobile body panel 20 and the mobile body case 40. Therefore, the rotational speed of the mobile case 40 when it returns to its original position is suppressed, and the time required from the detachment of the portable terminal 100 to the recovery of the magnetic force generated on the suction support surface 42a is increased.

[0036] [effect] With the disconnected charging device 10 equipped with the magnetic force adjustment mechanism as described above, a strong magnetic force can be generated on the suction support surface 42a when the portable terminal 100 is being held. On the other hand, when removing the portable terminal 100, the magnetic force generated on the suction support surface 42a can be weakened without requiring any operation on the disconnected charging device 10 side. This makes it possible to stabilize the holding state of the portable terminal 100 and to remove it smoothly.

[0037] [Application Examples] In the above embodiment, frictional force is generated between the suction support surface 42a and the portable terminal 100, so that when the portable terminal 100 is rotated, the mobile case 40 also rotates with it. However, a magnetic friction material such as silicone rubber may be placed on the suction support surface 42a to increase the frictional force generated between it and the portable terminal 100. With such a configuration, it is possible to improve the tracking ability of the mobile case 40 when the portable terminal 100 is rotated. [Industrial applicability]

[0038] In the above embodiment, in order to apply the magnetic force adjustment mechanism to the disconnected charging device 10, the movement of the mobile body case 40 is made rotational to increase resistance to misalignment and vibration between it and the mobile body base 30, etc. However, in the magnetic force adjustment mechanism according to the present invention, the movement of the mobile body case 40 relative to the mobile body base 30 may be linear. Even with such a configuration, the magnetic force adjustment mechanism can be effective as long as the mobile body panel 20 moves away from the suction support surface 42a as the mobile body case 40 moves. [Explanation of symbols]

[0039] 10... Non-connected charging device, 20... Mobile body panel, 20a... Through hole, 20b... Notch, 20c... Rotating shaft, 22... Permanent magnet, 24... Rotating body, 26... Damper, 28... Coil, 28a... Steel plate, 30... Mobile body base, 32... Mobile body base body, 32a... Side wall, 32b... Notch, 34... Substrate, 36... Cover, 38... Biasing means, 40... Mobile body case, 42... Bottom plate, 42a... Adsorption support surface, 44... Side wall, 46... Inclined surface, 48... Rotating shaft, 50... Rack gear, 100... Portable terminal.

Claims

1. A movable panel comprising a plate with a permanent magnet arranged on one side, and a rotating body that can rotate in a direction along the plate surface of the plate, A movable base that guides the movable panel to move in the thickness direction and restricts its movement in directions other than the thickness direction, The movable body case comprises an adsorption support surface for the object to be held, and an inclined surface along the thickness direction of the plate constituting the adsorption support surface, and allows the adsorption support surface to be moved relative to the movable body base in a direction along the plate surface of the adsorption support surface. The magnetic force adjustment mechanism is characterized in that the movable panel is positioned between the movable base and the movable case, and as the movable case moves, the rotating body rolls along the inclined surface, causing the distance between the suction support surface and the permanent magnet to change.

2. The movement of the aforementioned mobile case is rotational motion. The magnetic force adjustment mechanism according to claim 1, characterized in that the inclined surface is provided on the circumference of a circle with the rotation center of the rotational motion as the base point.

3. The magnetic force adjustment mechanism according to claim 2, characterized in that a biasing means is provided between the movable panel and the movable base for biasing the movable panel toward the movable case.

4. The magnetic force adjustment mechanism according to claim 3, characterized in that a damper is provided between the movable panel and the movable case to generate a force in a direction that opposes the rotational movement of the movable case.

5. A disconnected charging device having a magnetic force adjustment mechanism according to any one of claims 1 to 4, and characterized in that a coil for disconnected charging is provided between the mobile panel and the mobile case.

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