This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2009-150406, filed on Jun. 25, 2009 and prior International Application No. PCT/JP2010/003967, the entire contents of which are incorporated herein by reference.
The present invention is related to a wireless charger installed with a two-dimensional moving mechanism which is simply configured, inexpensive and can be easily miniaturized, wherein a table attached with a coil is freely moved in the X-axis direction and the Y-axis direction and power is transferred from the coil to the charger.
Various devices are proposed as a two-dimensional moving mechanism which freely moves a table in an X-axis direction and a Y-axis direction.
For example, the following two-dimensional moving device such is proposed as in Japanese Laid Open Patent H5-92376. In the Laid Open Patent, a two-dimensional moving mechanism is disclosed arranged with each pair of X-axis guides (14a, 14b) and X axis-racks (12a, 12b), each pair of Y-axis guides (26a, 26b) and Y axis-racks (24a, 24b), an X axis slider guide (30) movable in the Y axis direction along the Y axis guides and having pinion gears (33a, 33b) arranged across the Y axis guides and which mesh with each rack (24a, 24b) on both ends and a ball screw (34) parallel with this, an Y axis slider guide (18) movable in the X axis direction along the X axis guides having pinion gears (22a, 22b) arranged across the X axis guides and which mesh with each rack (12a, 12b) on both ends and a ball screw (38) parallel with this, a slider (42) movable in a X-Y direction on the X axis slider guide and Y axis slider guide and threaded to the ball screws (34, 38), and motors (38, 40) which rotationally drive the ball screws (34, 38) and move the sliders in the X-Y direction.
However, in this type of structure, miniaturization is difficult because a rack or ball screw must be arranged having a length equivalent to the distance which is moved by a slider in the X axis direction and Y axis direction. There is no description with regards to the material of a rack or ball screw in this Laid Open Patent, however it is usual to form a rack using a synthetic resin. A rack manufactured from a synthetic resin becomes more difficult to mold the longer it is, and component costs also increase. In addition, a ball screw is usually manufactured by cutting a metal round rod, however, a long ball screw is extremely expensive which is a problem.
In addition, a two dimensional moving device without using a rack disclosed in Japanese Laid Open Patent 2008-109762 is formed so that an X axis drive base (15) is meshed to a feed screw axis (12), the feed screw axis (12) is rotationally driven by an X motor (14) and the X axis drive base (15) is moved in an X axis direction, and a Y axis drive base (18) is meshed to a feed screw axis (16) which is attached to the X axis drive base (15), the feed screw axis (16) is rotationally driven by a Y motor (19) and the Y axis drive base (18) is moved in the Y axis direction.
However, in this type of structure too, miniaturization is difficult because a feed screw axis must be arranged having a length equivalent to the moving distance of the X axis drive base in the X axis direction and Y axis drive base in the Y axis direction. In addition, there is no description with regards to the material of the feed screw in this Laid Open Patent, however it is usual to manufacture this type of feed screw axis by cutting a metal round rod and shaping it as stated above and a long feed screw axis is extremely expensive which is a problem.
Thus, the present invention aims to provide a wireless charger installed with a two dimensional moving mechanism which can be easily miniaturized and can be cheaply manufactured with a simple structure.
The present invention includes a wireless charger installed with a two-dimensional moving mechanism which includes a coil attached within a lower case, and an upper covering from above the lower case. When a charge battery attached with a coil is set on a top surface of the upper case, the coil is moved near to the charge battery by the two dimensional moving mechanism and the charge battery is charged by supplying power from the coil towards the charge battery. The two-dimensional moving mechanism includes a first drive mechanism including an X axis motor which moves an X axis slider in an X axis direction along an X axis guide, a second drive mechanism including a Y axis motor which moves a Y axis slider in a Y axis direction along a Y axis guide, and a table which moves in an X axis direction and a Y axis direction by the movement of the X axis slider and the Y axis slider. The X axis slider is integrally formed by a rack parallel to the X axis guide and an extension part parallel to the Y axis. The Y axis slider is integrally formed by a rack parallel to the Y axis guide and an extension part parallel to the X axis. The table includes a slider base attached to the X axis slider and the Y axis slider, and which moves in the X axis direction along the Y axis slider when the X axis slider moves in the X axis direction, and moves in the Y axis direction along the X axis slider when the Y axis slider moves in the Y axis direction, a table body fixed to the slider base, and the coil attached to the top surface of the table body. The first drive mechanism includes a pair of X axis pinions arranged at a location to simultaneously mesh with teeth near both ends of a rack of the X axis slider, and are driven by the X axis motor and rotated in synchronization when the X axis slider is located at the center of a moving range. The second drive mechanism includes a pair of Y axis pinions arranged at a location to simultaneously mesh with teeth near both ends of a rack of the Y axis slider, and are driven by the Y axis motor and rotated in synchronization when the Y axis slider is located at the center of a moving range.
Each of the pinions may be formed by a two stage gear and power of each of the motors may be transferred to each of the pinions by meshing each pair of first stage gears to the rack and via a worm gear which includes a first worm and a second worm which mesh with each pair of second stage gears respectively.
In the wireless charge installed with a two dimensional moving mechanism of the present invention, the rack moves and is passed from one pinion to the other pinion by meshing each pair of the pinions to each rack formed integrally with an X axis slider and Y axis slider respectively and rotating each pair of the pinions in synchronization. Therefore, it is possible to reduce the length of each rack to half the length of the maximum moving distance of the X axis slider and Y axis slider. As a result, it becomes easier to mold the sliders even in the case where they are manufactured from a synthetic resin, it is possible reduce component costs and therefore cheaply manufacture the mechanism itself. Furthermore, it is possible to miniaturize the mechanism itself by shortening each rack.
In addition, by forming each of the pinions with a two stage gear and meshing a first worm and second worm of each worm gear with the second stage gear respectively, it is possible to perform a screw thread process just on the part which meshes with each pinion as a worm gear, shorten the screw compared to a conventional feed screw, and significantly reduce manufacturing costs.
The preferred embodiments for realizing the present invention are explained while referring to the diagrams.
This wireless type charger 1 charges the charge battery 2 by wirelessly transferring the power of the charger 1 is to the charge battery 2 by simply placing the charge battery 2 on the upper surface of the charger 1 as is shown in
As shown in
The arrows in the diagram show each axis direction, X shows the X axis direction, Y shows the Y axis direction and Z shows the Z axis direction. The two dimensional moving mechanism 4 is formed by an X axis guide 6 arranged parallel to the X axis direction, an X axis slider 7 which is guided by the X axis guide 6, a first drive mechanism 8 which moves the X axis slider 7, a Y axis guide 9 arranged parallel to the Y axis direction, a Y axis slider 10 which is guided by the Y axis guide 9, a second drive mechanism 11 which moves the Y axis slider 7, a slider base 12 which is attached to both the X axis slider 7 and the Y axis slider 10, and a table body 13 attached on the top of the slider base 12. A coil 14 is attached on the upper surface of the table body 13. A table 15 is formed by the table body 13, a coil 14 and the slider base 12.
The X axis guide 6 and the Y axis guide 9 are metal round rods. Both end parts of each are inserted from above to depression shaped axis attachment parts 20, 20 arranged on the lower case 3 and are prevented from being extracted from each axis attachment part 20, 20 by axis attachment guards 21, 21.
The first drive mechanism 8 is formed by an X axis motor 30, a worm gear 32 directly connected to an axis 31 of the motor 30, and a pair of X axis pinions 33, 34 which lie between the worm gear 32 and the rack 27. The pair of X axis pinions 33, 34 mesh simultaneously with teeth near both ends of the rack 27 in a state where the X axis slider 7 is located exactly at the center of a moving range in the X axis direction. Furthermore, the shape and dimensions of the pair of pinions 33, 34 are the same in the present embodiment, and while commonality of the components is aimed for, the shape and dimensions can be different according to design. The Y axis pinions 53, 54 described later are the same.
The worm gear 32 is arranged parallel to the X axis guide 6, and the end part on the opposite side to the X axis motor 30 is supported rotationally by an axis support part 35 arranged on the lower case 3. The worm gear 32 includes a first worm 36 and second worm 37 and the space between both worms 36, 37 form a linking part 38.
As is shown in
The second drive mechanism 11 is formed by a Y axis motor 50, a worm gear 52 directly connected to an axis 51 of the motor 50, and a pair of Y axis pinions 53, 54 which lie between the worm gear 52 and the rack 47. The pair of Y axis pinions 53, 54 mesh simultaneously with teeth near both ends of the rack 47 in a state where the Y axis slider 10 is located exactly at the center of a moving range in the Y axis direction.
The worm gear 52 is arranged parallel to the Y axis guide 9, and the end part on the opposite side to the Y axis motor 50 is supported rotationally by an axis support part 55 arranged on the lower case 3. The worm gear 52 includes a first worm 56 and second worm 57 and the space between both worms 56, 57 form a linking part 58.
As is shown in
The rectangular tube part 65 includes guard parts 69, 69 which project from the rectangular tube part 65 as shown the upper parts of a front surface and rear surface in the diagram respectively, a round hole 7 having a bottom arranged on the ceiling surface and a compression spring 71 is housed within the round hole 7. The upper end of the compressing spring projects from the upper surface of rectangular tube part 65.
As is shown in
As is shown
As is shown in
The coil 14 moves in the X axis direction and Y axis direction while being press contacted with the bottom surface of the upper case 5. Although omitted from the diagram, it is possible to prevent the coil from abrasion by interposing a thin wafer etc between the coil 14 and the upper case 5.
Next, the operation of the two dimensional moving mechanism is explained.
The power of the X axis motor 30 is transferred to the X axis slider 7 from the first worm gear 36 via the X axis pinion 33 and the slider 7 moves in the arrow X1 direction along the X axis guide 6. At the same time, the power of the Y axis motor 50 is transferred to the Y axis slider 10 from the second worm gear 57 via the Y axis pinion 54 and the slider 10 moves in the arrow Y1 direction along the Y axis guide 9.
Then, because the table 15 is located at an intersection part of the extension parts 28 of X axis slider 7 and the extension parts 48 of the Y axis slider 10, the coil 14 attached to the table 15 also moves along with the movement of the intersection part. In addition, when the coil 14 moves up to a certain position, the X axis motor 30 and Y axis motor 50 are stopped by the control means, power is transferred from the coil 14 to the charge battery 2 and the charge battery 2 begins to charge.
With the structure described above, it is possible to reduce the length of the racks 27, 47, to simplify the molding of the components, and to reduce the cost of manufacturing the components by arranging one pair each of the X axis pinions 33, 34 and the Y axis pinions 53, 54. And when the rack can be shortened, the mechanism itself can be miniaturized. These points are explained base on
In the structure of
However, in the structure of the present invention shown in
The structure of the present invention was explained above based on one embodiment. However, the present invention is not limited to this embodiment. For example, it is possible to insert an odd number of pinions or gears between a pair of pinions 33, 34 as is shown in
The present invention is also not limited to the structures of the first drive mechanism 8 and second drive mechanism 11. For example, as is shown in
Furthermore, the pinions 103, 104 are arranged at a position to mesh with the teeth near both ends of the rack 27 of the slider 27 when the slider 7 (not shown in the diagram) is located at the center of the moving range the same as in the embodiment described above. Furthermore, for example, because each pair of pinions is meshed with respect to each rack and the pair of pinions are rotated in synchronization, it is possible to shorten the worm gear 102 even if the worm gear 102 is formed by cutting a metal round rod. Therefore, it is possible to manufacture the worm gear cheaply even if it is made from metal. In addition, it is possible to fix one part of the bracket 105 of the drive mechanism 106 to one part of the lower case 3 with a screw etc (not shown in the diagram).
By forming the drive mechanism 106 as one integral unit in this way, it is not necessary to directly attach each individual part such as a motor, a worm gear, pinions etc to the lower case 3, and it is effective to relax the parts dimensions accuracy of the lower case. Furthermore, because a motor is not directly attached to the lower case 3, it is possible to further obtain the effect whereby it becomes more difficult for the vibration of the motor to be transferred to the lower case 3. It is also possible to obtain the effect of being able to reduce drive noise when it becomes more difficult for vibration of the motor to be transferred to the lower case. Even if vibration of the motor is transferred to the lower case, because it is possible to insert a cushion material between the lower case and motor it is easier to control drive noise compared to attaching the motor directly to the lower case.
Number | Date | Country | Kind |
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2009-150406 | Jun 2009 | JP | national |
Number | Date | Country | |
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Parent | PCT/JP2010/003967 | Jun 2010 | US |
Child | 13333428 | US |