JP2010193701A - Noncontact charger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noncontact charger preventing a heavy load from being imposed on a user for positioning. <P>SOLUTION: A recess including slopes is formed on the top of a primary casing (10) of a primary apparatus. The external shape of a secondary apparatus (2) having a secondary coil and a secondary battery therein is the same cylindrical shape as that of a general-purpose dry cell. The secondary apparatus houses a cylindrical secondary cell (e.g. AAA secondary cell) and a secondary coil is wound around a central axis of the secondary apparatus and the secondary cell along an outer periphery of the secondary cell. When a user places the secondary apparatus at any position of the slope, the secondary apparatus rolls on the slope and stops on the bottom of the recess. A primary core parallel to the central axis of the secondary apparatus stopping at the bottom of the recess is disposed at a lower position of the slope. Power is transmitted from the primary coil wound around the primary core to the secondary coil by means of electromagnetic induction, to charge the secondary cell in the secondary apparatus. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a non-contact type charger that charges a power storage unit such as a secondary battery provided in a secondary device in a non-contact manner.

  The non-contact charger can charge the secondary battery installed on the secondary device in a non-contact manner, so there are no concerns about contact failure and it can be used even in places with high moisture. Have. Non-contact charging is realized by transmitting power from the primary coil provided in the charger as the primary device to the secondary coil provided in the secondary device using electromagnetic induction. The In non-contact charging, it is necessary to optimize the positional relationship between the primary side coil and the secondary side coil so that power transmission by electromagnetic induction is efficiently performed (in other words, the primary side device and the secondary side It is necessary to optimize the positional relationship of the secondary equipment). The operation for optimizing this positional relationship is generally called positioning.

  Various techniques relating to contactless chargers have been proposed. For example, Patent Document 1 below proposes a charging function unit (corresponding to a primary side device) having a recess that can accommodate one or more dry cell type charged portions that are dry cell type secondary devices. In this charging function unit, a primary side coil is wound in a side wall that forms a recess, and electric power is transmitted from the primary side coil to a secondary side coil in a dry cell type charged unit that stands vertically in the recess. Then, the secondary battery in the dry cell type charged part is charged.

  According to this configuration, it is possible to charge dry battery type secondary devices having different shapes with a common charger (charging function unit). For example, the AA secondary device and the AAA secondary device can be charged by a common charger. However, in this configuration, it is necessary to stand a dry cell type secondary device vertically in the recess. Even in the recess, when the dry cell type secondary device is tilted, the induced electromotive force intended for the secondary coil is not generated, and charging is not efficiently performed. Therefore, the user must carefully place the dry cell type secondary device in the recess so as not to tilt. That is, a large burden is placed on the user regarding positioning.

  Moreover, in the following Patent Document 2, a secondary device having a size substantially the same as that of a general-purpose dry battery and having a flat surface on the outer periphery is proposed. According to the secondary side apparatus of patent document 2, a secondary side apparatus can be stably mounted in the designated location of a charger. However, the user needs to accurately place the secondary device at the designated location of the charger, and if the secondary device or charger is impacted and the secondary device is displaced, The user needs to correct the deviation. That is, even in the configuration of Patent Document 2, a large burden is placed on the user regarding positioning.

  Further, the charger shown in Patent Document 3 below is provided with a storage recess that is inclined by a predetermined angle with respect to the vertical direction. The user performs positioning by inserting a secondary side device (portable electronic device) having an outer shape that matches the hollow shape in the storage recess into the storage recess. Even in this configuration, it is necessary to accurately position the secondary device, and the insertion cannot be realized without accurate positioning by the user. Moreover, the secondary side apparatus which has a different shape cannot be charged with a common charger.

JP 2005-124324 A JP 2004-31888 A JP 2000-78763 A

  Then, an object of this invention is to provide the non-contact-type charger with few positioning requirements with respect to a user.

  The non-contact charger according to the present invention includes a primary side housing having a hollow portion including an inclined surface on which a cylindrical secondary side device provided with a secondary side coil and a power storage body rolls, and the primary side Primary for charging the power storage unit by generating an induced electromotive force in the secondary side coil of the secondary side device that is arranged inside the side housing and rolls on the slope to be arranged on the hollow portion. And a side coil.

  According to the non-contact charger, the secondary device rolls and is automatically positioned by simply placing the secondary device at an arbitrary position on the slope. That is, there are few positioning requests with respect to the user. Moreover, it becomes possible to charge the secondary side apparatus which has a different shape with a common non-contact-type charger.

  Specifically, for example, the position of the secondary coil after the secondary device rolls on the slope is compared with the position of the secondary coil before the secondary device rolls on the slope. The primary side coil is arranged so as to be closer to the position of the primary side coil.

  Also, specifically, for example, the primary side coil is wound around a primary side core, and the primary side core rolls on the slope and is cylindrical on the secondary side device in a state of being stationary on the hollow portion. Are arranged in parallel to the central axis direction.

  Further, for example, the primary coil is wound around a primary core, the primary housing has a core storage portion for accommodating the primary core therein, and the hollow portion includes the slope and the slope. The core storage part has a surface along a vertical surface that stops rolling of the secondary device due to the inclined surface.

  The configuration having the core storage portion contributes to the miniaturization of the primary side housing.

  For example, the lower end of the slope is inclined with respect to the horizontal plane.

  As a result, the positioning of the secondary device in the central axis direction can be automatically performed.

  Further, for example, a plurality of depressions each having an inclined surface are formed as the depressions on the outer peripheral surface of the primary housing, and the non-contact charger includes a secondary coil and a power storage unit for each. When a plurality of secondary devices having a plurality of secondary devices are arranged on the plurality of depressions, the primary coil is used to generate an induced electromotive force in the secondary coil of each secondary device to charge each power storage unit To do.

  For example, the slope is formed by a curved surface in which the slope angle of the slope changes continuously, and the curvature of the bottom of the slope is smaller than the curvature of the outer periphery of the secondary device.

  Further, for example, the primary side housing is provided with a plurality of the recessed portions, and the primary coil is disposed below each of the plurality of recessed portions, and is adjacent to the plurality of recessed portions. A shielding magnetic body is disposed between the pair of primary coils disposed below each of the matching recesses.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the non-contact-type charger with few positioning requests with respect to a user.

  The significance or effect of the present invention will become more apparent from the following description of embodiments. However, the following embodiment is merely one embodiment of the present invention, and the meaning of the term of the present invention or each constituent element is not limited to that described in the following embodiment. .

It is an external appearance perspective view of the primary side apparatus which concerns on embodiment of this invention. It is an external appearance perspective view of the secondary side apparatus which concerns on embodiment of this invention. It is the schematic diagram (a) which showed the secondary side apparatus together on sectional drawing of a primary side housing | casing, and the top view (b) which looked at the primary side apparatus from upper direction. It is a figure which shows a mode that the secondary side apparatus is arrange | positioned on the hollow part of a primary side housing | casing. It is a figure which shows the relationship between a primary side housing | casing and an X-axis, a Y-axis, and a Z-axis. It is an external appearance front view of a secondary side apparatus. It is a schematic diagram of the cross section of the secondary side apparatus along the axial direction of the cylinder which is the external shape of a secondary side housing | casing. It is an exploded view of a secondary side apparatus. It is a schematic diagram of the cross section along the YZ coordinate plane of the primary side apparatus and the secondary side apparatus in the state in which the secondary side apparatus is arrange | positioned on the hollow part of the primary side apparatus. It is a schematic electric circuit diagram of a primary side apparatus and a secondary side apparatus. It is an external appearance perspective view of the primary side apparatus which concerns on 1st Example. A schematic diagram (a) of a cross section of a primary side housing having a cross section taken along an XZ coordinate plane, a schematic view (b) of a cross section of a primary side housing having a cross section taken along a YZ coordinate plane, and It is the top view (c) which looked at the side housing | casing from upper direction. FIG. 4 is a diagram illustrating a secondary side device together with an enlarged cross-sectional view of a periphery of a hollow portion of a primary side housing having an XZ coordinate plane as a cross section according to the first embodiment. In connection with the second embodiment, a schematic diagram (a) of a cross section of a primary housing having a cross section taken along the XZ coordinate plane, a schematic diagram (b) of a cross section of the primary housing having a cross section taken along the YZ coordinate plane, and a primary It is the top view (c) which looked at the side housing | casing from upper direction. FIG. 6 is a diagram illustrating a secondary side device together with an enlarged cross-sectional view of a periphery of a hollow portion of a primary side housing having a cross section taken along an XZ coordinate plane according to the second embodiment. It is a schematic diagram of the cross section of the primary side housing | casing which concerns on 3rd Example and makes an XZ coordinate plane a cross section. It is a schematic diagram of the cross section of the primary side housing | casing which concerns on 4th Example and makes an XZ coordinate plane a cross section. FIG. 10 is a schematic diagram (a) of a cross section of a primary side casing having a cross section taken along an XZ coordinate plane and a schematic diagram (b) of a cross section of the primary side casing having a cross section taken along a YZ coordinate plane according to the fifth embodiment. It is the figure which added the external shape of the secondary side apparatus which has stopped at the bottom part of the hollow part to Fig.18 (a). It is an external appearance perspective view of the primary side apparatus which concerns on 6th Example. It is an external appearance perspective view of two division | segmentation housing | casings which concern on 6th Example and forms a primary side housing | casing. It is a side view of one division | segmentation housing | casing shown by FIG. It is a figure which concerns on 6th Example and shows a mode that the secondary side apparatus is accommodated on the hollow part of a primary side housing | casing. It is a figure which shows the modification of the primary side housing | casing which concerns on 6th Example, Comprising: The top view (a) which looked at the deformed primary side housing | casing from the perpendicular | vertical upper direction, and the side view ( It is the top view (b) seen from (X-axis direction). It is a schematic diagram of the cross section of the primary side housing | casing which concerns on 7th Example and makes an XZ coordinate plane a cross section. It is a schematic diagram of the cross section of the other primary side housing | casing which concerns on 7th Example and makes an XZ coordinate plane a cross section. It is a schematic diagram of the cross section of the primary side housing | casing which concerns on 8th Example and makes an XZ coordinate plane a cross section. It is a schematic diagram of the cross section of the primary side housing | casing which concerns on 9th Example and makes an XZ coordinate plane a cross section. It is a schematic diagram of the cross section of the primary side housing | casing which concerns on 10th Example and makes an XZ coordinate plane a cross section. It is a schematic diagram of the cross section of the primary side housing | casing which concerns on 11th Example and makes an XZ coordinate plane a cross section. It is a schematic diagram of the cross section which concerns on the modification of 11th Example and makes the XZ coordinate plane of a primary side housing | casing a cross section. It is an external appearance perspective view of the primary side housing | casing which concerns on 12th Example. It is a schematic diagram of the cross section of the primary side housing | casing which concerns on 12th Example. It is a block diagram which shows the structure of the charging circuit of the primary side apparatus shown in 12th Example. It is a schematic diagram which shows the installation to the primary side housing | casing of a charge control part and a primary side coil.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In each of the drawings to be referred to, the same part is denoted by the same reference numeral, and redundant description regarding the same part is omitted in principle. The first to twelfth embodiments will be described later. First, matters that are common to each embodiment or items that are referred to in each embodiment will be described.

  The charging system according to the embodiment of the present invention includes a primary side device 1 and a secondary side device 2. The primary side device 1 is a non-contact charger that charges the secondary battery in the secondary side device 2 in a non-contact manner by electromagnetic induction using a coil.

  FIG. 1 is an external perspective view of the primary side device 1, and FIG. 2 is an external perspective view of the secondary side device 2. The primary device 1 includes a rectangular parallelepiped housing (hereinafter referred to as a primary housing) 10 having a recess (corresponding to the recess 100 in FIG. 11) on the upper surface, and a magnetic material (ferromagnetic material). A primary side core and a primary side coil (not shown in FIG. 1) wound around the primary side core. The primary side core and the primary side coil are disposed in the primary side housing 10. The secondary device 2 includes a cylindrical housing (hereinafter referred to as a secondary housing) 20 and a secondary coil (not shown in FIG. 2). The secondary coil is disposed in the secondary housing 20.

  The hollow portion of the primary side device 1 is formed including a slope, and as shown in FIG. 3A, when the secondary side device 2 is placed on this slope, the secondary side device 2 rolls on the slope and is hollow. It stops at the bottom of the part. FIG. 3A shows the secondary device 2 together with a schematic diagram of a cross section of the primary housing 10 with a cross section perpendicular to the slope, and the slope is secondary. It is the figure which showed a mode that the side apparatus 2 rolled. Moreover, FIG.3 (b) is the top view which looked at the primary side apparatus 1 from upper direction. Reference numerals 12 and 13 denote a primary side core and a primary side coil provided in the primary side device 1, respectively. In the example shown in FIGS. 3A and 3B, the primary core 12 has a plate-like core (for example, ferrite) having a surface parallel to the upper surface of the primary housing 10 and disposed below the slope. Core). The primary coil 13 is wound around the primary core 12 along the cross-sectional direction of FIG.

  Then, as shown in FIG. 4, electric current is supplied from the primary side coil (power transmission side coil) 13 to the secondary side device 2 in a state where the secondary side device 2 is arranged on the hollow portion of the primary side device 1, so The secondary battery in the secondary device 2 is charged by non-contact transmission to the secondary coil (power receiving coil).

  In addition, in the example shown in FIG. 1, FIG. 3 (a) and (b), and FIG. 4, the number of hollow parts is one, However, The number of hollow parts may be plural. It is also possible to charge a plurality of secondary batteries in a plurality of secondary devices at the same time by providing a plurality of recesses on the upper surface of the primary housing 10 and arranging a secondary device in each of the recesses. It is.

  For clarification of the description to be described later, as shown in FIG. 5, a three-dimensional orthogonal coordinate system XYZ having the X axis, the Y axis, and the Z axis orthogonal to each other as coordinate axes is defined in relation to the primary device 1. When the presence of the hollow portion is ignored, the outer shape of the primary housing 10 is a rectangular parallelepiped shape, and the upper surface and the lower surface of the rectangular parallelepiped are parallel to the XY coordinate plane (the surfaces along the X axis and the Y axis), Of the four side surfaces other than the upper and lower surfaces of the rectangular parallelepiped, two side surfaces are parallel to the YZ coordinate plane (the plane along the Y axis and the Z axis) and the remaining two side surfaces are the XZ coordinate planes (the X axis and the Z axis). Parallel to the plane along the axis). Unless otherwise specified, it is assumed that the XY coordinate plane is parallel to the horizontal plane. When viewed from the origin O where the X axis, the Y axis, and the Z axis intersect with each other, the positive direction of the Z axis is defined as the upward direction, and the negative direction of the Z axis is defined as the downward direction. Therefore, if the XY coordinate plane is parallel to the horizontal plane, gravity acts in a direction from positive to negative on the Z axis (a direction from the upper surface to the lower surface of the primary housing 10). Further, the lower end of the slope forming the hollow portion of the primary device 1 is parallel to the Y axis.

  The structure of the secondary device 2 will be described with reference to FIGS. FIG. 6 is an external front view of the secondary device 2. FIG. 7 is a schematic view of a cross section of the secondary device 2 along the axial direction of the cylinder, which is the outer shape of the secondary housing 20. FIG. 8 is an exploded view of the secondary device 2. The outer shape of the secondary device 2 according to the present embodiment is the same as the outer shape of a general-purpose battery, and the secondary device 2 can be used in the same manner as a general-purpose battery.

  In the present embodiment, it is assumed that the outer shape of the secondary device 2 (the outer shape of the secondary housing 20) is the same as that of an AA or AAA battery. The secondary side device 2 can be charged with the secondary battery in the secondary side device 2 regardless of whether the external shape of the secondary device 2 is an AA type dry cell external shape or an AAA type dry cell external shape. The device 1 is designed.

  As shown in FIGS. 7 and 8, the secondary device 2 is provided with two exterior members 20 a, a secondary battery 21, a magnetic film 22, a secondary coil 23, and a flexible substrate 24.

  The secondary battery 21 is a secondary battery such as a nickel hydride secondary battery. A secondary battery having an arbitrary shape can be used as the secondary battery 21. However, a general-purpose secondary battery can be used as the secondary battery 21. For example, although different from the configuration shown in FIGS. 6 to 8, an AAA type secondary battery is used as the secondary battery 21 and the outer shape of the secondary housing 20 is the same as that of an AA type dry battery, Two electrodes connected to the positive and negative electrodes of the secondary battery 21 may be provided at both ends of the secondary casing 20. Thereby, the secondary side apparatus 2 can be used similarly to a general purpose AA type secondary battery.

  In the present embodiment, similarly to a general-purpose secondary battery, it is assumed that the external shape of the secondary battery 21 is a cylindrical shape, and the positive and negative electrodes of the secondary battery 21 are provided on both end faces of the cylinder. To do. Furthermore, it is assumed that the positive and negative electrodes of the secondary battery 21 are used as the positive and negative electrodes of the secondary device 2 as they are. A cylindrical axis (center axis) which is the outer shape of the secondary battery 21 is referred to as a center axis CX. The length of the secondary device 2 in the direction along the central axis CX is represented by L2 (see FIG. 6).

  The magnetic film 22 is a flexible, insulating film formed using a magnetic material (ferromagnetic material), and is wound around the outer peripheral surface of the secondary battery 21 around the central axis CX. . A secondary coil 23 is wound around the central axis CX on the magnetic film 22. The magnetic film 22 functions as a secondary core for increasing the magnetic flux density of the interlinkage magnetic flux of the secondary coil 23 that is induced by the primary coil 13. Instead of the magnetic film 22, a rigid secondary side core (for example, a ferrite core) may be provided at the same position as the magnetic film 22.

  The magnetic film 22 is wound around a part of the outer peripheral surface of the secondary battery 21. A flexible substrate 24 is wound around the remaining portion of the outer peripheral surface of the secondary battery 21. An electric circuit including a rectifier circuit is mounted on the flexible substrate 24. In addition, although the magnetic film is wound around a part of the outer peripheral surface of the secondary battery 21, it may be wound around the whole.

  The secondary casing 20 is formed by joining two exterior members 20a made of an insulating material. The secondary battery 21, the magnetic film 22, the secondary coil 23, and the flexible substrate 24 are accommodated in the internal space of the secondary casing 20 formed when the two exterior members 20a are joined. The secondary housing 20 is not formed by the two exterior members 20a, but the secondary housing 20 is formed by one cylindrical exterior member having a hollow inside. It may be.

  FIG. 9 is a cross section along the YZ coordinate plane (see FIG. 5) of the primary side device 1 and the secondary side device 2 in a state where the secondary side device 2 is arranged on the hollow portion of the primary side device 1. FIG. When the secondary device 2 is disposed on the recess of the primary device 1, the primary coil 13 and the secondary coil 23 are magnetically coupled together with the primary core 12 and the magnetic film 22 to form a magnetic circuit. Form. In FIG. 9, the magnetic film 22 and the like are not shown for simplification.

  In the primary side device 1, a DC voltage generated in the primary side device 1 is converted into an AC voltage using an oscillation circuit. When this AC voltage is applied to the primary coil 13 and an AC current flows through the primary coil 13, an induced electromotive force is generated in the secondary coil 23 by electromagnetic induction. The secondary battery 21 can be charged with this induced electromotive force. In FIG. 9, a broken line curve 301 represents a flow of magnetic flux generated by flowing an alternating current through the primary side coil 13. The schematic diagram of the cross section shown in FIG. 9 is an example. By changing the shape of the primary housing 10, the positional relationship between the primary coil 13 and the secondary coil 23 is the same as that shown in FIG. Can vary (details below).

  An arbitrary circuit capable of generating an induced electromotive force in the secondary coil 23 by charging an alternating current through the primary side coil 13 and charging the secondary battery 21 with the induced electromotive force is connected to the primary side device 1 and It can be mounted on the secondary device 2. As an example, FIG. 10 shows a schematic electrical circuit diagram of the primary device 1 and the secondary device 2 employed in the present embodiment. Each part referred to by reference numerals 31 to 36 is provided in the primary device 1. Each part referred to by reference numerals 41 to 43 is mounted on the flexible substrate 24.

  In the example shown in FIG. 10, a half-bridge resonant inverter circuit is employed. The DC voltage output from the DC voltage source 31 is converted into an AC voltage using an oscillation circuit. When this AC voltage is applied to the primary coil 13 and an AC current flows through the primary coil 13, an induced electromotive force is generated between both ends of the secondary coil 23. The induced electromotive force is converted into a direct current by a rectifier circuit including diodes 41 and 42, and the secondary battery 21 is charged.

  The secondary device 2 can be placed on the recess so that the positive electrode of the secondary device 2 faces the positive side of the Y axis, and the negative electrode of the secondary device 2 is the positive side of the Y axis. It is also possible to place the secondary device 2 on the indented portion so as to face. Although the polarity of the induced electromotive force generated in the secondary coil 23 is reversed between the former placement and the latter placement, a rectifier circuit including diodes 41 and 42 having a connection relationship as shown in FIG. 10 is provided. Thus, the secondary battery 21 can be charged regardless of the polarity direction.

  In the following, first to twelfth embodiments will be described as examples for explaining a structural example of the primary side housing 10 in detail. If no contradiction arises, the matters described in one embodiment can be applied to other embodiments. Further, in the description of each embodiment, the above-described contents are applied to matters that are not particularly described. For example, the primary side casing 10a is shown below as an example of the primary side casing 10, but matters not particularly described for the primary side casing 10a are described above with respect to the primary side casing 10. The same applies to the primary side casing 10a (the same applies to the primary side casing 10b and the like).

<< First Example >>
First, the first embodiment will be described. In the first embodiment, the primary side casing 10 a is used as the primary side casing 10. The appearance and cross section of the primary side housing 10a are the same as those shown in FIGS. 1, 3A and 3B, and FIG. This will be described in more detail.

  FIG. 11 is an external perspective view of the primary side housing 10a as viewed obliquely from above. FIG. 12A is a schematic diagram of a cross section of the primary side housing 10a whose cross section is the XZ coordinate plane, and FIG. 12B is a schematic diagram of a cross section of the primary side housing 10a whose cross section is the YZ coordinate plane. FIG. 12C is a plan view of the primary housing 10a as viewed from above. On the XZ coordinate plane, the primary casing 10a and the primary core 12 have a line-symmetric structure with respect to the Z axis. On the XY coordinate plane, the primary casing 10a and the primary core 12 have a line-symmetric structure with respect to the X axis and the Y axis, respectively. On the YZ coordinate plane, the primary casing 10a and the primary core 12 have a line-symmetric structure with respect to the Z axis. In FIGS. 12A to 12C, illustration of the primary coil 13 and the circuits accompanying it is omitted. The same applies to other drawings (FIG. 13 and the like) relating to the primary side casing that will be referred to later.

  A recess exists on the upper surface 105 of the primary housing 10 a, and the recess is referred to as a recess 100. The hollow portion 100 has a triangular prism shape, and the primary casing 10a is formed by removing the triangular prism portion from a rectangular parallelepiped member. The triangular prism as the shape of the hollow portion 100 is formed from the end surfaces 103 and 104 (see FIG. 12B) and three surfaces. The end faces 103 and 104 are parallel to the XZ coordinate plane. Of the three surfaces, two surfaces that are not parallel to the upper surface 105 are the inclined surfaces 101 and 102.

  In the XZ coordinate plane (see FIG. 12A), the slope 101 forms a line segment having a negative slope in the second quadrant, and the slope 102 forms a line segment having a positive slope in the first quadrant. . Their absolute values are equal. However, they may be different. In the XZ coordinate plane (see FIG. 12A), the lower ends of the slopes 101 and 102 are joined at the origin O, and the upper end of the slope 101 and the upper end of the slope 102 are in the second and first quadrants, respectively. The upper surface 105 is joined.

  The primary core 12 is disposed inside the primary housing 10a and below the origin O. The primary core 12 is a plate-shaped core whose thickness direction is the Z-axis direction, and the upper and lower surfaces of the primary core 12 are parallel to the XY coordinate plane. A primary side coil 13 is wound around the central axis of the primary side core 12 parallel to the Y axis along the outer peripheral surface of the primary side core 12.

  The length in the Y-axis direction (that is, the distance between the end faces 103 and 104) LA1 of the recess 100 is larger than the length L2 of the secondary device 2 so that the secondary device 2 can be accommodated in the recess 100. Is done. Further, the length LB1 of the primary side core 12 in the Y-axis direction is longer than the length LA1.

  When the secondary device 2 is placed at an arbitrary position on the recess 100 so that the direction of the central axis CX of the secondary device 2 is substantially coincident with the Y-axis direction, the secondary device 2 is inclined by the slope 101 or 102. , And rests at the bottom on the recess 100 with the central axis CX facing the Y-axis direction. In a state where the secondary device 2 is stationary at the bottom of the recess 100, the central axis CX is parallel to the upper surface of the primary core 12 (see FIG. 9).

  Further, as can be understood from the above description, the secondary device 2 is in contact with the upper part of the slope 101 (that is, the state before the secondary device 2 rolls on the slope 101). Thus, when the secondary device 2 rolls on the slope 101 and is stationary at the bottom of the recess 100, the distance between the central axis CX and the primary core 12 is shorter and the primary coil 13 and The distance between the secondary coils 23 is also short. The same applies to the slope 102. Since the distance between the primary side coil 13 and the secondary side coil 23 becomes short, the power transmission efficiency between both coils improves, and the time required for charging is shortened.

  In order to allow the secondary battery 21 to be charged regardless of whether the secondary side device 2 has an outer shape of an AA type dry cell or an outer size of an AAA type dry cell, the inclination angle of the slope is set as follows. It is good to set like this. Please refer to FIG. FIG. 13 is a view showing the secondary device 2 stationary at the bottom of the recess 100 in an enlarged view of the periphery of the origin O of the cross section of the primary housing 10a along the XZ coordinate plane.

  The radius of the cylinder that is the outer shape of the secondary device 2 is represented by r. The distance between the joint between the slope 101 and the slope 102 and the primary core 12, that is, the distance between the origin O and the upper surface of the primary core 12 is represented by dA. The distance between the lowermost part of the secondary device 2 and the upper surface of the primary core 12 when the secondary device 2 is stationary at the bottom of the recess 100 is expressed in dB. The inclination angle of the slopes 101 and 102 is represented by α. The inclination angle α is an acute angle formed by the XY coordinate plane and the inclined surface 101 or 102.

  It is known in advance through experiments and the like that the upper limit of dB that can charge the secondary battery 21 is 3 [mm] when r is 7.25 [mm] and dA is 1 [mm]. Assuming that 7.25 [mm] is the standard maximum radius of the AA size dry cell. In this case, after substituting 7.25, 1 and 3 for r, dA and dB, respectively, the inclination angle α satisfying the inequality “α ≦ cos−1 (r / (r + dB−dA))” is obtained. Good. Substituting 7.25, 1 and 3 for r, dA and dB on the right side of this inequality gives cos-1 (r / (r + dB-dA)) = 38.4. Therefore, if the inclination angle α is set to be larger than 0 ° and not more than 38.4 °, the secondary side device 2 has a secondary side regardless of whether the outer shape of the secondary side device 2 is an AA type or a AAA type. The device 2 is stationary at a chargeable position.

  In addition, since the radius of the AAA type is smaller than the radius of the AA type, the outer shape of the secondary side device 2 is compared with the case where the outer shape of the secondary side device 2 matches that of the AA type. The distance dB becomes smaller when is equal to that of the AAA type. When the outer shape of the secondary device 2 matches that of the AAA type, the cross-sectional area of the secondary coil 23 (the cross-sectional area perpendicular to the central axis CX) becomes relatively small, and the primary coil Since it is difficult for the secondary side coil 23 to pick up the 13 generated magnetic fluxes, it is convenient that the distance dB is reduced as described above.

  According to this embodiment, it is possible to charge secondary-side devices having various sizes with a common primary-side device. At this time, the user only needs to lightly place the secondary device on any part of the slope existing on the upper surface of the primary device without being aware of the difference in size of the secondary device and the direction of the positive and negative electrodes. The secondary device rolls on the slope and the secondary device is automatically positioned in the X-axis direction, and the secondary coil of the secondary device can reliably take in the magnetic flux from the primary coil. Further, as in Patent Document 1, if a configuration in which the secondary side device is arranged inside the cylindrical primary side core is adopted, the size of the primary side device including the primary side core is inevitably increased. By configuring the primary side device (by magnetically coupling the primary side coil 13 and the secondary side coil 23 in the magnetic path 301 as shown in FIG. 9), the primary side device is reduced in size. Further, when the magnetic path as in the configuration of Patent Document 3 is formed, the positioning of the secondary side device with respect to the primary side device must be strictly performed. The power transfer efficiency decays rapidly. On the other hand, if the magnetic path 301 as shown in FIG. 9 is formed, even if the positional relationship between the primary side device and the secondary side device slightly deviates from the optimum position, the power transmission efficiency is hardly deteriorated. That is, the configuration in the present embodiment has a high degree of freedom for positioning.

<< Second Example >>
In the first embodiment, the recess is formed by two inclined surfaces having the same inclination angle. However, the inclination angles of these inclined surfaces may be different from each other, as shown in FIG. May be changed to a vertical plane. A configuration example in which one slope is changed to a vertical plane will be described as a second embodiment. In the second embodiment, the primary side casing 10 b is used as the primary side casing 10.

  FIG. 14A is a schematic diagram of a cross section of the primary side housing 10b whose cross section is the XZ coordinate plane, and FIG. 14B is a schematic diagram of a cross section of the primary side housing 10b whose cross section is the YZ coordinate plane. is there. FIG. 14C is a plan view of the primary housing 10b as viewed from above. On the XY coordinate plane, the primary housing 10b and the primary core 12 have a line-symmetric structure with respect to the X axis. On the YZ coordinate plane, the primary housing 10b and the primary core 12 have a line-symmetric structure with respect to the Z axis.

  A depression exists on the upper surface 115 of the primary housing 10 b, and the depression is referred to as a depression 110. The hollow portion 110 has a triangular prism shape, and the primary casing 10b is formed by removing the triangular prism portion from the rectangular parallelepiped member. The triangular prism as the shape of the recess 110 is formed from the end surfaces 113 and 114 (see FIG. 14B) and three surfaces. The end faces 113 and 114 are parallel to the XZ coordinate plane. Of the three surfaces, two surfaces that are not parallel to the upper surface 115 are an inclined surface 111 and an end surface 112 parallel to the vertical surface.

  In the XZ coordinate plane (see FIG. 14A), the inclined surface 111 forms a line segment having a negative inclination in the second quadrant, and the end surface 112 extends from the origin O to the positive side of the Z axis. The line segment is formed. In the XZ coordinate plane (see FIG. 14A), one end of the inclined surface 111 and the end surface 112 are joined at the origin O, and the other end of the inclined surface 111 and the other end of the end surface 112 are second and second, respectively. It is joined to the upper surface 115 in one quadrant.

  The primary core 12 is disposed inside the primary housing 10b and below the origin O. The primary core 12 is a plate-shaped core whose thickness direction is the Z-axis direction, and the upper and lower surfaces of the primary core 12 are parallel to the XY coordinate plane. A primary side coil 13 is wound around the central axis of the primary side core 12 parallel to the Y axis along the outer peripheral surface of the primary side core 12.

  The Y-axis direction length (that is, the distance between the end surfaces 113 and 114) LA1 of the recess 110 is larger than the length L2 of the secondary device 2 so that the secondary device 2 can be accommodated in the recess 110. Is done. Further, the length LB1 of the primary side core 12 in the Y-axis direction is longer than the length LA1.

  When the secondary device 2 is placed at an arbitrary position on the inclined surface 111 such that the direction of the central axis CX of the secondary device 2 substantially coincides with the Y-axis direction, the secondary device 2 is in contact with the end surface 112. Rolls down the slope 111 and finally stops at the bottom on the depression 110 with the outer peripheral surface of the secondary device 2 in contact with the slope 111 and the end face 112 and the central axis CX facing the Y-axis direction. (See also FIG. 15). The end surface 112 functions as a surface that stops the rolling of the secondary device 2 by the inclined surface 111. In a state where the secondary device 2 is stationary at the bottom of the recess 110, the central axis CX is parallel to the upper surface of the primary core 12 (see FIG. 9).

  Further, as understood from the above description, compared to the state in which the secondary device 2 is in contact with the upper part on the slope 111 (that is, the state before the secondary device 2 rolls on the slope 111). Thus, when the secondary device 2 rolls on the slope 111 and is stationary at the bottom of the depression 110, the distance between the central axis CX and the primary core 12 is shorter and the primary coil 13 and The distance between the secondary coils 23 is also short.

  In order to allow the secondary battery 21 to be charged regardless of whether the secondary side device 2 has an outer shape of an AA type dry cell or an outer size of an AAA type dry cell, the inclination angle of the slope is set as follows. It is good to set like this. Refer to FIG. FIG. 15 is a diagram showing an enlarged view around the origin O in the cross section of the primary housing 10b along the XZ coordinate plane, and the secondary device 2 stationary at the bottom of the recess 110.

  The radius of the cylinder that is the outer shape of the secondary device 2 is represented by r. The distance between the joint portion of the slope 111 and the end face 112 and the primary core 12, that is, the distance between the origin O and the upper surface of the primary core 12 is represented by dA1. The distance between the lowest part of the secondary device 2 and the upper surface of the primary core 12 when the secondary device 2 is stationary at the bottom of the recess 110 is represented by dB1. The inclination angle of the slope 111 is represented by β1. The inclination angle β1 is an acute angle formed by the XY coordinate plane and the inclined surface 111.

  It is known in advance through experiments that r2 is 7.25 [mm] and dA1 is 1 [mm] and the upper limit of dB1 that can charge the secondary battery 21 is 3 [mm]. Assuming that In this case, after substituting 7.25, 1 and 3 for r, dA1 and dB1, respectively, the inclination angle β1 may be obtained so as to satisfy the inequality “β1 ≦ 90−2 × β2”. Here, β2 = tan −1 (r / (r + dB1−dA1)). Substituting 7.25, 1 and 3 respectively into r, dA1 and dB1 on the right side of the β2 equation yields tan-1 (r / (r + dB1−dA1)) ≈38.1. Therefore, from 90-2 × 38.1 = 13.8, if the inclination angle β1 is set to be greater than 0 ° and less than or equal to 13.8 °, the outer shape of the secondary side device 2 is that of AA and single. Even if it is any of the four types, the secondary device 2 stops at a position where it can be charged. As in the first embodiment, the distance dB1 is smaller when the outer shape of the secondary device 2 matches that of the AAA type than when it matches the AA type.

  Even if the primary casing is formed as in the second embodiment, the same effect as in the first embodiment can be obtained. Further, it is possible to reduce the size of the primary housing in the X-axis direction as compared with the first embodiment.

<< Third Example >>
Next, a third embodiment will be described. In the third embodiment, the primary side casing 10 c is used as the primary side casing 10. FIG. 16 is a schematic diagram of a cross section of the primary housing 10c with the XZ coordinate plane as a cross section. The shape of the outer peripheral surface of the primary housing 10c is the same as that of the primary housing 10b according to the second embodiment. However, the arrangement position of the primary side core in the primary side casing differs between the primary side casing 10b and the primary side casing 10c. Focusing only on this difference, the structure of the primary housing 10c will be described.

  The primary core 12 is disposed inside the primary housing 10c and on the positive side of the X axis. In the third embodiment, the primary side core 12 is a plate-like core whose thickness direction is the X-axis direction, and the left side surface and the right side surface of the primary side core 12 are parallel to the YZ coordinate plane. The left side surface of the primary core 12 is assumed to be closer to the end surface 112 (and the origin O) than the right side surface of the primary side core 12. In the third embodiment, the left indicates the negative direction side of the X axis, and the right indicates the positive direction side of the X axis.

  A part forming the primary housing 10c is referred to as a core storage unit 118. The core storage portion 118 is a substantially rectangular parallelepiped member having a cavity inside, and accommodates the primary core 12 in which the primary coil 13 is wound in the cavity. In the third embodiment, the thickness direction of the primary core 12 is the X-axis direction. The primary coil 13 is wound around the central axis of the primary core 12 parallel to the Y axis along the outer peripheral surface of the primary core 12. The core storage unit 118 is disposed on the right side of the origin O, and the left side surface of the rectangular parallelepiped that is a schematic outer shape of the core storage unit 118 is an end surface 112 joined to the lower end of the inclined surface 111. Here, the right side and the left side correspond to the positive side and the negative side in the X-axis direction. In the third embodiment, it can be considered that the recessed portion 110 is formed to include the inclined surface 111 and a part of the core storage portion 118 (end surface 112).

  When the secondary device 2 is placed at an arbitrary position on the inclined surface 111 such that the direction of the central axis CX of the secondary device 2 substantially coincides with the Y-axis direction, the secondary device 2 is in contact with the end surface 112. Rolls down the slope 111 and finally stops at the bottom on the depression 110 with the outer peripheral surface of the secondary device 2 in contact with the slope 111 and the end face 112 and the central axis CX facing the Y-axis direction. . The end surface 112 functions as a surface that stops the rolling of the secondary device 2 by the inclined surface 111. In a state where the secondary device 2 is stationary at the bottom of the recess 110, the central axis CX is parallel to the left side surface of the primary core 12.

  Further, as understood from the above description, compared to the state in which the secondary device 2 is in contact with the upper part on the slope 111 (that is, the state before the secondary device 2 rolls on the slope 111). Thus, when the secondary device 2 rolls on the slope 111 and is stationary at the bottom of the depression 110, the distance between the central axis CX and the primary core 12 is shorter and the primary coil 13 and The distance between the secondary coils 23 is also short (the same applies to other examples described later).

  According to the third embodiment, the same effect as the first embodiment can be obtained. Further, by arranging the primary core 12 so as to be perpendicular to the right side of the slope (see FIG. 16), the height of the primary casing can be reduced by the absence of the primary core 12 below the slope. It becomes.

<< 4th Example >>
The lowermost portion of the hollow portion 100 of the primary side housing 10a shown in the first embodiment is a line (that is, the joining line of the inclined surfaces 101 and 102 in FIG. 12A), but the lowermost portion is a surface. There may be. FIG. 17 is a schematic cross-sectional view of the primary side housing 10d according to the fourth embodiment, with the XZ coordinate plane as a cross section, with the lowermost portion of the hollow portion 100 as a surface. In the fourth embodiment, a primary housing 10 d is used as the primary housing 10.

  The hollow part provided in the upper surface 105 of the primary side housing 10d is referred to by reference numeral 120. The primary side housing 10a is made to be a primary side housing by filling the bottom part of the hollow portion 100 shown in FIG. 12A or the like with the forming material of the primary side housing 10a so that the bottom of the hollow portion becomes a surface. It is transformed into a body 10d. A surface formed at the lowermost portion of the recess 120 is referred to as a bottom surface 126. The primary side housing 10d is the same as the primary side housing 10a except that the lowermost part of the hollow portion is not a line but a surface.

  The bottom surface 126 can be a plane parallel to the XY coordinate plane. In the XZ coordinate plane, one end and the other end of the bottom surface 126 are joined to the lower end of the slope 101 and the lower end of the slope 102, respectively, and the origin O can be set at the center of the bottom surface 126. As in the first embodiment, the primary core 12 is disposed inside the primary housing 10d and below the origin O. However, as compared with the first embodiment, the primary core 12 can be positioned further upward by the amount corresponding to the lowermost portion of the recess 120. As a result, it is possible to reduce the height of the primary housing as compared with the first embodiment. The bottom surface 126 may be a surface other than a flat surface (for example, a curved surface). For example, when the bottom surface 126 is a curved surface that is continuously connected to the inclined surfaces 101 and 102, when dust or the like is collected near the bottom surface 126 and the bottom surface 126, it can be easily removed.

  When the secondary device 2 is placed at an arbitrary position on the recess 120 so that the direction of the central axis CX of the secondary device 2 substantially coincides with the Y-axis direction, the secondary device is the same as in the first embodiment. 2 rolls on the slope 101 or 102 and stops at the bottom on the recess 120 in a state where the central axis CX faces the Y-axis direction. In a state where the secondary device 2 is stationary at the bottom of the recess 120, the central axis CX is parallel to the upper surface of the primary core 12. The width in the X-axis direction of the bottom surface 126 is larger than the diameter of the AAA battery so that the central axis CX is surely oriented in the Y-axis direction when the secondary device 2 is stationary at the bottom of the recess 120. Shortened.

  Although the method of deforming the primary side casing 10a according to the first embodiment into the primary side casing 10d has been described, the same modification can be applied to the primary side casing 10b according to the second embodiment or the third embodiment. You may apply to the primary side housing | casing 10c. That is, the cross-sectional shape (the cross-sectional shape along the XZ coordinate plane) of the primary side housing 10b or 10c may be modified so that the lowermost portion of the hollow portion 110 is a flat surface.

<< 5th Example >>
Next, a fifth embodiment will be described. In the first to fourth embodiments, the inclination angle of the inclined surface forming the depression is constant over the entire inclined surface, but as shown in FIG. It is also possible to change to.

  In the fifth embodiment, the primary side casing 10 e is used as the primary side casing 10. FIG. 18A is a schematic diagram of a cross section of the primary side housing 10e whose cross section is the XZ coordinate plane, and FIG. 18B is a schematic diagram of a cross section of the primary side housing 10e whose cross section is the YZ coordinate plane. FIG. On the XZ coordinate plane, the primary housing 10e and the primary core 12 have a line-symmetric structure with respect to the Z axis. On the YZ coordinate plane, the primary housing 10e and the primary core 12 have a line-symmetric structure with respect to the Z axis. Although not obvious from FIGS. 18A and 18B, on the XY coordinate plane, the primary casing 10e and the primary core 12 have a line-symmetric structure with respect to the X axis and the Y axis, respectively. is doing.

  A recess exists on the upper surface 135 of the primary housing 10 e, and the recess is referred to as a recess 130. By removing the recessed portion 130 from the rectangular parallelepiped member, the primary side housing 10e is formed. The depression 130 is obtained by replacing the slope 101 of the depression 120 (see FIG. 17) with a two-stage slope composed of slopes 131a and 131b and replacing the slope 102 of the depression 120 with a two-stage slope composed of slopes 132a and 132b. equal. The surfaces 133 and 134 are both end surfaces in the Y-axis direction of the recessed portion 130 that are parallel to the XZ coordinate plane, and correspond to the end surfaces 103 and 104 in FIG. The lowest part of the depression 130 is a bottom surface 136 corresponding to the bottom surface 126 of FIG.

  The bottom surface 136 can be a plane parallel to the XY coordinate plane (however, it can be a plane other than the plane). It is assumed that the origin O is located at the center of the bottom surface 136. In the XZ coordinate plane, one end and the other end of the bottom surface 136 are joined to the lower end of the slope 131b and the lower end of the slope 132b, respectively, and the upper end of the slope 131b and the upper end of the slope 132b are respectively connected to the lower end of the slope 131a and the lower end of the slope 132a. The upper end of the slope 131a and the upper end of the slope 132a are joined to the upper surface 135 in the second and first quadrants, respectively.

  In the XZ coordinate plane, the slopes 131a and 131b form a line segment having a negative slope in the second quadrant, and the slopes 132a and 132b form a line segment having a positive slope in the first quadrant. The inclination angles of the slopes 131a and 132a are equal, and the inclination angles of the slopes 131b and 132b are equal. However, the inclination angle of the slope 131b is larger than the inclination angle of the slope 131a. The inclination angles of the inclined surfaces 131a, 132a, 131b, and 132b mean acute angles formed by the inclined surfaces 131a, 132a, 131b, and 132b and the XY coordinate plane. In addition, the inclination angles of the inclined surfaces 131a and 132a can be made different from each other, and the inclination angles of the inclined surfaces 131b and 132b can be made different from each other.

  The primary core 12 is disposed inside the primary housing 10e and below the origin O. The primary core 12 is a plate-shaped core whose thickness direction is the Z-axis direction, and the upper and lower surfaces of the primary core 12 are parallel to the XY coordinate plane. A primary side coil 13 is wound around the central axis of the primary side core 12 parallel to the Y axis along the outer peripheral surface of the primary side core 12.

  The Y-axis direction length (that is, the distance between the end surfaces 133 and 134) LA1 of the recess 130 is larger than the length L2 of the secondary device 2 so that the secondary device 2 can be accommodated in the recess 130. Is done. Further, the length LB1 of the primary side core 12 in the Y-axis direction is longer than the length LA1.

  When the secondary device 2 is placed at an arbitrary position on the inclined surface 131a so that the direction of the central axis CX of the secondary device 2 substantially coincides with the Y-axis direction, the secondary device 2 sets the inclined surfaces 131a and 131b. It rolls and rests at the bottom on the depression 130 with the central axis CX facing the Y-axis direction. The same applies when the secondary device 2 is placed on the slope 132a. In a state where the secondary device 2 is stationary at the bottom of the recess 130, the outer peripheral surface of the secondary device 2 may contact the slopes 131b and 132b and further contact the bottom surface 136 as shown in FIG. is there. In a state where the secondary device 2 is stationary at the bottom of the recess 130, the central axis CX is parallel to the upper surface of the primary core 12. Further, the width in the X-axis direction of the bottom surface 136 is the diameter of the AAA dry battery so that the central axis CX is surely oriented in the Y-axis direction when the secondary device 2 is stationary at the bottom of the recess 130. Shorter than.

  Further, as can be understood from the above description, the secondary side device 2 is positioned on the slope 131a (that is, the state before the secondary side device 2 rolls on the two-step slope). When the secondary device 2 rolls on the slopes 131a and 131b and is stationary at the bottom of the recess 130, the distance between the central axis CX and the primary core 12 is shorter and the primary coils 13 and The distance between the secondary coils 23 is also short. The same applies to the slopes 132a and 132b.

  According to the fifth embodiment, the range in which the user can place the secondary device 2 when attempting to charge is expanded, and convenience is improved. When the slope is a one-step slope, when trying to expand the range in which the secondary device 2 can be placed, the height of the primary housing tends to be high, depending on the tilt angle. For example, if the slope angle of the slope 132a in FIG. 18A is changed to be the same as the slope angle of the slope 132b, the boundary between the slopes 132a and 132b is eliminated and a one-step slope is formed. If the X coordinate value of the right end of the one-step slope is aimed to be the same as the X coordinate value of the right end of the slope 132a before the change of the tilt angle, the height of the primary housing will be considerably increased. From this, it can be said that the adoption of the two-step slope according to the fifth embodiment contributes to the reduction of the height of the primary housing.

  It is also possible to omit the bottom surface 136 from the primary housing 10e and directly join the lower ends of the slope 131b and the slope 132b as in the primary housing 10a of the first embodiment (see FIG. 12A). is there. Moreover, as the primary side housing | casing 10a which concerns on 1st Example was changed into the primary side housing | casing 10b which concerns on 2nd Example, one two-step slope (for example, slope 132a and 132b in the primary side housing | casing 10e). The secondary core 12 may be changed to a vertical plane, and the primary core 12 may be stored in the core storage portion including the vertical plane as in the third embodiment.

<< Sixth Example >>
You may incline the lower end (bottom part of a hollow part) of the slope in the primary side housing | casing described in the 1st, 2nd, 3rd, 4th or 5th Example with respect to a horizontal surface. The sixth embodiment exemplifies a structure in which the lower end of the slope (the bottom of the hollow portion) in the primary side casing of the first embodiment is tilted with respect to the horizontal plane. FIG. 20 is an external perspective view of the primary housing 10f according to the sixth embodiment. The hollow part provided in the upper surface 155 of the primary side housing | casing 10f is referred by the code | symbol 150. FIG.

  In order to describe the shape of the primary housing 10f, the shapes of the divided housings 10f1 and 10f2 will be described for convenience. FIG. 21 is an external perspective view of the divided housings 10f1 and 10f2. In FIG. 21, hidden lines are shown for the divided housing 10f2 to prevent complication of the illustration, but the hidden lines are not shown for the divided housing 10f1.

  The outer shape of the divided housing 10f1 is the same as that of the primary housing 10a according to the first embodiment (see FIG. 12A, etc.). The upper surface of the divided housing 10f1 that finally functions as the upper surface 155 of the primary side housing 10f is provided with a hollow portion 150 having the same shape as the hollow portion 100 of the primary side housing 10a. The two slopes of the depression 150 corresponding to the slopes 101 and 102 (see FIG. 12A) of the depression 100 are referred to as slopes 151 and 152.

  The divided housing 10f2 is a triangular prism-shaped member having a right triangle as a cross-sectional shape. FIG. 22 is a plan view of the right triangle. Of the three sides of the right triangle, two sides orthogonal to each other are referred to by reference numerals 161 and 162, and the remaining one side is referred to by reference numeral 163. The acute angle formed between the side 161 and the side 163 is represented by θ.

  The shape of the surface including the side 163 in the divided housing 10f2 and the shape of the lower surface of the divided housing 10f1 are the same. The divided housings 10f1 and 10f2 are joined by joining these surfaces (the surface including the side 163 and the lower surface of the divided housing 10f1). The entire casing (the combined casing of the divided casings 10f1 and 10f2) obtained by this combination is the primary casing 10f. For convenience of explanation, it has been described that the combination of the divided casings 10f1 and 10f2 is the primary casing 10. However, the primary casing 10f is actually disassembled by the divided casings 10f1 and 10f2. Rather, it is an integrated housing.

  The outer shape of the divided casing 10f1 and the arrangement positions of the primary core 12 and the primary coil 13 in the divided casing 10f1 can be made the same as those of the primary casing 10a in the first embodiment.

  The primary housing 10f is placed on a desk or the like so that the surface including the side 161 is parallel to the horizontal plane. For this reason, the upper surface 155 of the primary housing 10f is inclined by an angle θ with respect to the horizontal plane. Accordingly, in the sixth embodiment, it is considered that the XY coordinate plane is also inclined by an angle θ with respect to the horizontal plane. That is, in the sixth embodiment, the relationship between the divided housing 10f1 and the X, Y, and Z axes and the relationship between the primary housing 10a according to the first embodiment and the X, Y, and Z axes are as follows. The X axis, the Y axis, and the Z axis are defined for the divided casing 10f1 and the primary casing 10f so as to be the same (see FIG. 20). A direction from the origin O along the Y axis toward the lower surface of the primary housing 10f is defined as a positive direction of the Y axis.

  When the secondary device 2 is placed at an arbitrary position on the recess 150 so that the direction of the central axis CX of the secondary device 2 is substantially coincident with the Y-axis direction, the secondary device 2 will be Roll on slope 151 or 152 at 150. In addition, since the entire depression 150 is inclined by the angle θ with respect to the horizontal plane (because the lower ends of the inclined surfaces 151 and 152 along the Y-axis direction are inclined by the angle θ with respect to the horizontal plane), the secondary side The device 2 moves so as to slide down on the recess 150 along the Y-axis direction. As a result, as shown in FIG. 23, the secondary device 2 is stationary in a state where it is located on the positive direction side of the Y axis as much as possible in the bottom of the recess 150. In this stationary state, the central axis CX faces the Y-axis direction and is parallel to the upper surface of the primary core 12.

  In this way, by tilting the bottom of the hollow portion in the primary housing with respect to the horizontal plane, the secondary device 2 is positioned not only in the X-axis direction but also in the Y-axis direction (center axis CX direction). Is made easy. That is, the user simply places the secondary device 2 at an arbitrary position on the recess 150, and the secondary device 2 moves so as to slide downward along the Y-axis direction while rolling on the slope 151 or 152. And finally stop at the optimal position for charging.

  The following modifications may be made on the basis of the structure of the primary housing 10f described above.

  In view of the fact that the secondary device 2 is stationary in the state where the secondary device 2 is located on the positive direction side of the Y axis as much as possible, the arrangement position of the primary core 12 in the primary housing 10f is determined. It may be shifted to the positive side of the Y-axis (FIG. 20 corresponds to the figure after this shifting).

  Moreover, you may make it provide the primary side core 12a instead of the primary side core 12 in the primary side housing | casing 10f. The primary casing 10f that has been modified to provide the primary core 12a is referred to as a primary casing 10f '. FIG. 24A is a plan view of the primary side casing 10f ′ viewed from above in the vertical direction, and FIG. 24B is a plan view of the primary side casing 10f ′ viewed from the X-axis direction. The primary side core 12a is a cylindrical core (for example, a ferrite core) having an axis obtained by translating the Y axis in the positive direction of the Z axis as a central axis, and along the outer peripheral surface of the primary side core 12a, A primary coil 13 is wound around the central axis of the primary core 12a. Further, the primary side core 12a is aligned with the primary side casing 10f ′ so that the central axis of the primary side core 12a coincides with the central axis CX when the secondary side device 2 is stationary on the recess 150. Housed inside.

  By arranging the primary side core 12a in this way, the magnetic flux generated in the primary side coil 13 passes intensively around the central axis CX, so that the power transmission efficiency is improved.

<< Seventh Embodiment >>
In the above-described first to sixth embodiments, it is assumed that one primary device 1 is provided with one depression, and one primary device 1 charges one secondary device 2. However, a plurality of depressions may be provided in one primary device 1. By housing a plurality of secondary devices 2 in a plurality of depressions, it is possible to charge a plurality of secondary devices 2 simultaneously.

  For example, a primary side housing 10g having two recesses as shown in FIG. 25 can be formed. The primary side housing 10g can be used as the primary side housing 10. FIG. 25 is a schematic diagram of a cross section of the primary housing 10g having a cross section taken along the XZ coordinate plane. In FIG. 25, a state in which the secondary device 2 is accommodated in each of the recesses 200 and 201 is indicated by a dotted line (the outer shape of the secondary device 2 is indicated by a dotted line). FIG. 25 shows a case where the outer shape of the secondary device 2 on the recesses 200 and 201 is that of AA-size and AAA-size dry batteries, respectively.

  The primary side housing 10g is formed by providing the two hollow portions 200 and 201 adjacent to each other in the X-axis direction on the upper surface of the rectangular parallelepiped housing. Each of the recessed portions 200 and 201 is the same as the recessed portion 100 according to the first embodiment. In the XZ coordinate plane, the primary side housing 10g and the primary side core 12g as the primary side core 12 have a line-symmetrical structure with respect to the Z axis, and the depression 200 and the second and first quadrants respectively. 201 is provided.

  The primary side core 12g is disposed inside the primary side housing 10g and below the recesses 200 and 201. The primary side core 12g is a plate-like core whose thickness direction is the Z-axis direction, and the upper surface and the lower surface of the primary side core 12g are parallel to the XY coordinate plane. A primary coil 13 is wound around the central axis of the primary core 12g parallel to the Y axis along the outer peripheral surface of the primary core 12g. The length in the X-axis direction of the primary core 12g is made longer than the distance in the X-axis direction between the lowermost part of the hollow part 200 and the lowermost part of the hollow part 200. That is, the primary core 12g is arranged across the plurality of depressions. By supplying an alternating current to the primary side coil 13, an induced electromotive force is generated in the secondary side coil 23 in each secondary side device 2 on the depressions 200 and 201, and the secondary battery in each secondary side device 2. 21 is charged.

  In the example shown in FIG. 25, the shape of the recess 200 is the same as that of the recess 100, but the shape of the recess 200 may be the same as that of the recess 110, 120 or 130 (FIG. 14). FIG. 17 or FIG. 18). The same applies to the depression 201. Further, as described in the sixth embodiment, it is possible to incline the bottoms of the recesses 200 and 201 with respect to the horizontal plane.

  Of course, it is also possible to provide three or more depressions on the upper surface of the primary housing. For example, as shown in FIG. 26, a primary side housing 10g 'having three recesses may be formed. The primary side casing 10g ′ can be used as the primary side casing 10. FIG. 26 is a schematic diagram of a cross section of the primary housing 10g ′ having a cross section taken along the XZ coordinate plane. In FIG. 26, a state in which the secondary device 2 is accommodated in each of the hollow portions 210 to 212 is indicated by a dotted line (the outer shape of the secondary device 2 is indicated by a dotted line).

  The primary side casing 10g 'is formed by providing the three depressions 210 to 212 adjacent to each other in the X-axis direction on the upper surface of the rectangular parallelepiped casing. Each of the depressions 210 to 212 is the same as the depression 100 according to the first embodiment. In the XZ coordinate plane, the primary side casing 10g ′ and the primary side core 12g ′ as the primary side core 12 have a line-symmetric structure with respect to the Z axis, and are recessed portions in the second and first quadrants, respectively. 210 and 212 are provided, and the lowest part of the depression 211 is located on the Z-axis.

  The primary side core 12g 'is disposed inside the primary side casing 10g' and below the depressions 210 to 212. The primary side core 12g 'is a plate-like core whose thickness direction is the Z-axis direction, and the upper surface and the lower surface of the primary side core 12g' are parallel to the XY coordinate plane. The primary side coil 13 is wound around the central axis of the primary side core 12g 'parallel to the Y axis along the outer peripheral surface of the primary side core 12g'. The length in the X-axis direction of the primary core 12g 'is set longer than the distance in the X-axis direction between the lowermost part of the recessed part 210 and the lowermost part of the recessed part 212. By supplying an alternating current to the primary side coil 13, an induced electromotive force is generated in the secondary side coil 23 in each secondary side device 2 on the depressions 210 to 212, and the secondary battery in each secondary side device 2. 21 is charged.

  In the example shown in FIG. 26, the shape of the hollow portion 210 is the same as that of the hollow portion 100, but the shape of the hollow portion 210 may be the same as that of the hollow portion 110, 120, or 130 (FIG. 14). FIG. 17 or FIG. 18). The same applies to the recesses 211 and 212. Further, as described in the sixth embodiment, it is possible to incline the bottoms of the depressions 210 to 212 with respect to the horizontal plane.

  If the primary side casing is formed as described above, the primary side core is disposed across the plurality of depressions, and therefore, the plurality of secondary devices 2 can be charged simultaneously. At this time, a plurality of secondary devices 2 to be charged at the same time may be mixed with AA type and AAA type devices (the same applies to the eighth to tenth embodiments described later). . Further, since only one set of primary core and primary coil need be provided in the primary housing, only one oscillation circuit for exciting the primary coil is required. That is, an increase in circuit scale accompanying an increase in the number of secondary devices to be charged is suppressed.

<< Eighth Example >>
The primary housing 10h may be formed by modifying the primary housing 10g of FIG. 25 as follows. FIG. 27A is a schematic diagram of a cross section of the primary housing 10h with the XZ coordinate plane as a cross section. The primary side housing 10 h can be used as the primary side housing 10. In FIG. 27A, a state in which the secondary device 2 is accommodated in each of the recesses 220 and 221 is indicated by a dotted line (the outer shape of the secondary device 2 is indicated by a dotted line). ).

  The primary housing 10h is formed by providing the two recesses 220 and 221 adjacent to each other in the X-axis direction on the upper surface of the rectangular housing. Each of the recessed portions 220 and 221 is the same as the recessed portion 100 according to the first embodiment. In the XZ coordinate plane, the primary side housing 10h and the primary side core 12h as the primary side core 12 have a line-symmetrical structure with respect to the Z axis, and the recess 220 and the second side and the first quadrant respectively. 221 is provided.

  In the XZ coordinate plane, the Z-axis side slope 222 forming the depression 220 has a positive slope, and the Z-axis slope 223 forming the depression 221 has a negative slope. The lower ends of the slopes 222 and 223 are located on the X axis, and the upper ends of the slopes 222 and 223 are joined on the Z axis.

  The primary core 12h is disposed inside the primary housing 10h and at an intermediate position between the lower end of the inclined surface 222 and the lower end of the inclined surface 223. The primary core 12h is a rod-shaped core (for example, a ferrite core) having a longitudinal direction in the Y-axis direction. For example, as shown in FIG. 27A, the primary core 12h has a cross-sectional shape on the XZ coordinate plane. It can be square or substantially square. At this time, if the length of one side of the square is set to be the same as the diameter of the AA dry battery and the inclination angles of the inclined surfaces 222 and 223 are both set to 45 °, the cross-sectional shape of the primary core 12h is obtained. The length of one side of the square is minimized.

  A surface 225 of the primary side core 12 h that faces the inclined surface 222 is parallel to the central axis CX of the secondary side device 2 that is stationary at the bottom of the recess 220. A surface 226 of the primary side core 12 h that faces the inclined surface 223 is parallel to the central axis CX of the secondary side device 2 that is stationary at the bottom of the recess 221. The primary side coil 13 is wound around the central axis of the primary side core 12h parallel to the Y axis along the outer peripheral surface of the primary side core 12h (in the example of FIG. 27A, the central axis and the Y axis are I do it). By supplying an alternating current to the primary side coil 13, an induced electromotive force is generated in the secondary side coil 23 in each secondary side device 2 on the depressions 220 and 221, and the secondary battery in each secondary side device 2. 21 is charged.

  When the cross-sectional shape of the primary core 12h is square on the XZ coordinate plane, and the length of one side of the square is the same as the diameter of the AA-type dry battery, as shown in FIG. A line 225A extending in the direction perpendicular to the surface 225 from the upper end and a line 225B extending in the direction orthogonal to the surface 225 from the lower end of the surface 225 are the tangent lines on the outer periphery of the AA secondary device 2 on the recess 220. And the line 226A extending in the direction orthogonal to the surface 226 from the upper end of the surface 226 and the line 225B extending in the direction orthogonal to the surface 226 from the lower end of the surface 226 are the AA secondary side devices on the recess 221. The primary-side core 12h may be arranged so as to be tangent to the outer periphery of 2. On the XZ coordinate plane, the size of the cross section of the primary side core 12h so that the lines 225A, 225B, 226A and 226B do not intersect with the outer shape of the AA secondary device 2 stationary on the recesses 220 and 221. It is also possible to further expand the length. The AA secondary device 2 refers to the secondary device 2 having the same external shape as that of an AA dry battery.

  That is, on the XZ coordinate plane, an AA secondary device that is stationary on the depression 220 in a region located between the lines 225A and 225B and on the depression 220. The primary-side core 12h may be arranged so that all the outer shapes of 2 are included (the same applies to the relationship between the lines 226A and 226B and the recessed portion 221). The former region is in the direction orthogonal to the surface 225 from both ends of the surface 225 of the primary core 12h facing the AA secondary device 2 stationary on the depression 220 on the XZ coordinate plane. It can also be expressed as an area located between two extending lines 225A and 225B. By providing such a primary side core 12h, the magnetic flux generated in the primary side core 12h and the primary side coil 13 can be efficiently picked up by the entire secondary side device 2, and the amount of charging power per unit time Maximization of (amount of power transmission by electromagnetic induction) is achieved, and charging can be completed in a short time.

  In addition, the primary core size determining method and the arrangement position determining method can be applied to other embodiments as long as there is no contradiction. In other words, in each of the embodiments other than the eighth embodiment, the following primary side core is preferably provided. On the XZ coordinate plane, located between two lines extending in a direction perpendicular to the surface from the both ends of the primary core facing the AA secondary device 2 stationary on the depression It is preferable that the primary core is arranged in the region on the hollow portion so that the outer shape of the AA type secondary device 2 stationary on the hollow portion is included.

  In the example shown in FIG. 27 (a), the shape of the recessed portion 220 is the same as that of the recessed portion 100, but the shape of the recessed portion 220 may be the same as that of the recessed portion 120 or 130 (FIG. 17 or FIG. 18) It may be the same as the recess 120 (see FIG. 17). The same applies to the recess 221. Further, as described in the sixth embodiment, the bottoms of the recesses 220 and 221 can be inclined with respect to the horizontal plane. When three or more secondary devices 2 are charged simultaneously, as described in the seventh embodiment, three or more recesses may be provided in the primary housing.

  As described above, when the cross-sectional shape of the primary core is made square (or close to a square), the primary coil can be easily wound. In addition, since the distance between the secondary device and the primary core can be designed to be shorter than the structure shown in the seventh embodiment (see FIG. 25 or FIG. 26), the secondary coil can be more efficiently used. The magnetic flux can be taken into the.

<< Ninth Embodiment >>
The primary side casing 10i of FIG. 25 may be modified as follows to form the primary side casing 10i. FIG. 28 is a schematic diagram of a cross section of the primary housing 10i with the XZ coordinate plane as a cross section. In FIG. 28, a state in which the secondary device 2 is accommodated in each of the recesses 230 and 231 is indicated by a dotted line (the outer shape of the secondary device 2 is indicated by a dotted line). The primary housing 10 i can be used as the primary housing 10.

  The outer shape of the primary side casing 10i is the same as that of the primary side casing 10g of FIG. However, the shape and arrangement position of the primary side coil are different between the primary side casings 10g and 10i.

  The primary side housing 10i is formed by providing the two recessed portions 230 and 231 adjacent to each other in the X-axis direction on the upper surface of the rectangular parallelepiped housing. Each of the recessed portions 230 and 231 is the same as the recessed portion 100 according to the first embodiment. In the XZ coordinate plane, the primary side housing 10i has a line-symmetric structure with respect to the Z axis, and recesses 230 and 231 are provided in the second and first quadrants, respectively.

  In the XZ coordinate plane, the slope 232 on the Z-axis side forming the depression 230 has a positive slope, and the slope 233 on the Z-axis side forming the depression 231 has a negative slope, and The other slope 234 forming the recess 230 has a negative slope, and the other slope 235 forming the recess 231 has a positive slope. The lower ends of the slopes 232 and 234 are joined on the X axis, the lower ends of the slopes 233 and 235 are joined on the X axis, and the upper ends of the slopes 232 and 233 are joined on the Z axis.

  A primary side core 12 i 1 is provided inside the primary side housing 10 i so as to face the slope 234, and a primary side core 12 i 2 is provided so as to face the slope 235. That is, one primary side core is provided for one depression. Each of the primary side cores 12i1 and 12i2 is a plate-like core (for example, a ferrite core) having a longitudinal direction in the Y-axis direction.

  The surface of the primary core 12 i 1 that faces the inclined surface 234 is parallel to the inclined surface 234 and parallel to the central axis CX of the secondary device 2 that is stationary at the bottom of the recess 230. The surface of the primary core 12i2 that faces the inclined surface 235 is parallel to the inclined surface 235 and parallel to the central axis CX of the secondary device 2 that is stationary at the bottom of the recessed portion 231. In addition, as in the ninth embodiment, the width of the primary core 12i1 in the direction of the slope 234 and the width of the primary core 12i2 in the direction of the slope 235 are equal to or larger than the diameter of the AA secondary device 2. Good. A primary coil 13i1 is wound around the central axis of the primary core 12i1 parallel to the Y axis along the outer peripheral surface of the primary core 12i1. A primary coil 13i2 is wound around the central axis of the primary core 12i2 parallel to the Y axis along the outer peripheral surface of the primary core 12i2.

  In the ninth embodiment, each of the primary side cores 12i1 and 12i2 functions as the primary side core 12, and each of the primary side coils 13i1 and 13i2 functions as the primary side coil 13, and each of the primary side coils 13i1 and 13i2 has an alternating current. By supplying a current, an induced electromotive force is generated in the secondary coil 23 in each secondary device 2 on the depressions 230 and 231 to charge the secondary battery 21 in each secondary device 2. .

  As described above, by providing one primary side core for each depression, the supply of alternating current to the primary side coils 13i1 and 13i2 and the frequency of the alternating current can be controlled independently for each primary side coil. It becomes possible, and charge control for every secondary side apparatus 2 is attained. Further, if a structure such as the primary side housing 10i is adopted, the height of the primary side housing can be increased as compared with the structure shown in the seventh or eighth embodiment (see FIGS. 25 to 27A, etc.). It can be lowered.

  In the example shown in FIG. 28, the shape of the recess 230 is the same as that of the recess 100, but the shape of the recess 230 may be the same as that of the recess 110, 120, or 130 (FIG. 14). FIG. 17 or FIG. 18). The same applies to the recessed portion 231. Further, as described in the sixth embodiment, the bottoms of the recesses 230 and 231 can be inclined with respect to the horizontal plane.

Moreover, since it is provided to the primary side core 12i ₁ and 12i ₂ faces the slopes 234 and 235 of those who are separated from each other among the slopes of the adjacent recess portions 230 and 231 to each other, the primary coil of the one recess Can be prevented from interlinking with the secondary device 2 and the primary coil arranged in the other adjacent recess.

<< Tenth Embodiment >>
In the case where two or more secondary devices 2 are charged simultaneously, a core storage unit may be provided between adjacent recesses, and the primary core may be disposed in the core storage unit. As an example of the primary side casing having such a structure, the primary side casing 10j is illustrated in the tenth embodiment. The primary housing 10j can be used as the primary housing 10.

  The primary side casing 10j is formed by applying the following modifications to the primary side casing 10e shown in FIG. First, the primary side core 12 is temporarily omitted from the primary side housing 10e. Next, the primary housing 10e is divided into two housings with the YZ coordinate plane as a boundary, and the core housing in which the primary core 12 is stored between the first and second housings obtained by this division. After sandwiching the additional casing including the portion 252, the first casing, the additional casing, and the second casing are coupled. One housing obtained by this connection is the primary housing 10j.

  Accordingly, the primary housing 10j is provided with the slopes 131a, 131b, 132a, and 132b described with reference to FIG. 18A and the like, and the upper ends of the slopes 131a and 132a are on the upper surface 135 of the secondary housing 10j. Be joined. Further, when the primary housing 10e is divided as described above, the bottom surface 136 (see FIG. 18A) of the primary housing 10e is also divided into two surfaces, one of the two surfaces being The primary side housing 10j functions as the bottom surface 255, and the other functions as the bottom surface 256 of the primary side housing 10j.

  The core storage portion 252 is a substantially rectangular parallelepiped member having a cavity inside, and accommodates the primary core 12 in which the primary coil 13 is wound in the cavity. The thickness direction of the primary core 12 provided in the primary casing 10j is the X-axis direction. The primary coil 13 is wound around the central axis of the primary core 12 parallel to the Y axis along the outer peripheral surface of the primary core 12. In the XZ coordinate plane, the Z axis passes through the centers of the core storage unit 252 and the primary side core 12, and the primary side housing 10j and the primary side core 12 including the core storage unit 252 have a line-symmetric structure with respect to the Z axis. is doing.

  In the XZ coordinate plane, the slopes 131a and 131b are located in the second quadrant, and the slopes 132a and 132b are located in the first quadrant. In the XZ coordinate plane, one end of the bottom surface 255 is joined to the lower end of the inclined surface 131b, the other end of the bottom surface 255 is joined to the lower end of the left side surface of the core storage unit 252, and one end of the bottom surface 256 is joined to the lower end of the inclined surface 132b. The other end of the bottom surface 256 is joined to the lower end of the right side surface of the core storage unit 252. The left side surface and the right side surface of the core storage unit 252 are vertical surfaces parallel to the YZ coordinate plane. The right side and the left side here correspond to the positive side and the negative side in the X-axis direction.

  The two depressions provided in the primary housing 10j are referred to by reference numerals 250 and 251. The hollow portion 250 is a portion that is depressed with respect to the upper surface 135 of the primary side housing 10j, and the hollow is formed along the slope 131a, the slope 131b, the bottom surface 255, and the left side surface of the core storage portion 252. The hollow portion 251 is a portion that is depressed with respect to the upper surface 135 of the primary housing 10 j, and the hollow is formed along the slope 132 a, the slope 132 b, the bottom surface 256, and the right side surface of the core storage portion 252.

  When the secondary device 2 is placed at an arbitrary position on the inclined surface 131a such that the direction of the central axis CX of the secondary device 2 substantially coincides with the Y-axis direction, the secondary device 2 The slopes 131a and 131b are rolled until they contact the left side surface. Finally, the outer peripheral surface of the secondary device 2 is in contact with the slope 131b and the left side surface of the core storage portion 252 with the central axis CX facing the Y-axis direction. It stops at the bottom on the depression 250. The left side surface of the core storage portion 252 functions as a surface that stops the rolling of the secondary side device 2 by the two-step slope formed by the slopes 131a and 131b. In a state where the secondary device 2 is stationary at the bottom of the recess 250, the central axis CX is parallel to the left side surface of the primary core 12. Further, the width in the X-axis direction of the bottom surface 255 is the diameter of the AAA dry battery so that the central axis CX is surely oriented in the Y-axis direction when the secondary device 2 is stationary at the bottom of the recess 250. Shorter than. Although the slope 131a, the slope 131b, the bottom surface 255, the left side surface of the core storage portion 252 and the recess portion 250 formed therefrom are described, the slope surface 132a, the slope 132b, the bottom surface 256, the right side surface of the core storage portion 252 and the right side surface thereof are formed. The same applies to the recessed portion 251 to be formed.

  By supplying an alternating current to the primary side coil 13, an induced electromotive force is generated in the secondary side coil 23 in each secondary side device 2 on the depressions 250 and 251, and the secondary battery in each secondary side device 2. 21 is charged.

  As described above, the primary side core is vertically arranged between the adjacent recesses, and as in the third embodiment (see FIG. 16), the primary side core does not exist below the inclined surface. Can be lowered. In addition, it is possible to reduce the size of the primary side core as compared with the structure in which the primary side core is provided below the plurality of depressions (see FIG. 25).

  However, it is also possible to provide the primary side core below the bottom surfaces 255 and 256 instead of inside the core storage portion 252. It is also possible to make the inclination angles of the inclined surfaces 131a and 131b coincide with each other to eliminate the boundary between both inclined surfaces (the same applies to the inclined surfaces 132a and 132b). Further, the bottom surface 255 may be deleted so that the lower end of the inclined surface 131b is directly joined to the lower end of the left side surface of the core storage portion 252 (the same applies to the bottom surface 256).

<< Eleventh embodiment >>
In the first to tenth embodiments, the inclination angle of the slope of the depression is constant over the entire slope, or is changed in a plurality of stages, but in the eleventh embodiment, the inclination angle of the slope is as shown in FIG. It is formed by a continuously changing curved surface.

  In the eleventh embodiment, the primary housing 10k is used as the primary housing 10. FIG. 30 is a schematic diagram of a cross section of the primary housing 10k having a cross section taken along the XZ coordinate plane. On the XZ coordinate plane, the primary casing 10k and the primary core 12 have a line-symmetric structure with respect to the Z axis. Although not apparent from FIG. 30, the XY coordinate plane has a line-symmetric structure with respect to the Y axis, and the YZ coordinate plane has a line-symmetric structure with respect to the Z axis. Yes.

  A recess is present on the upper surface 405 of the primary housing 10k, and the recess is referred to as a recess 410. The primary side housing 10k is formed by removing the recessed portion 410 from the rectangular parallelepiped member. The hollow portion 410 is obtained by replacing the slopes 101 and 102 of the hollow portion 100 (see FIG. 12) with slopes 401 in which the slope angle of the slope continuously changes, that is, an arc-like slope when viewed from the XZ coordinate plane. be equivalent to.

  The arcuate slope is formed symmetrically about the Z axis as viewed from the XZ coordinate plane. Here, a portion that is most deeply recessed from the upper surface 405 on the Z-axis is referred to as a bottom portion 402. At this time, the origin O on the XZ coordinate is assumed to be on the bottom 402 on the Z axis. In the XZ coordinate plane, the inclined surface 401 is at the same position as the upper surface 405 in the Z-axis direction, and forms an elliptical curved surface with the same position as the origin in the X-axis direction. The elliptical slope 401 is formed such that the curvature of the bottom 402 is equal to or less than the curvature of the outer periphery of the secondary device 2. For example, when the secondary device is an AA secondary battery, the outer diameter is 14.5 [mm] and the radius is 7.25 [mm]. Since the curvature is the reciprocal of the radius, in this case, the curvature of the bottom 402 is preferably formed to be 0.138 or less (rounded to the fourth decimal place). In the eleventh embodiment, the slope 401 is formed so that the curvature of the bottom 402 becomes 0.027. Although the inclined surface 410 is elliptical in the XZ coordinate plane, a perfect circle or a curve such as a cycloid curve may be used.

  The primary core 12 is disposed inside the primary housing 10k and below the origin O (that is, below the bottom 402). The primary side core 12 is a plate-like core having a thickness in the Z-axis direction, and the upper surface and the lower surface of the primary side core 12 are arranged in parallel to the horizontal plane. The primary side core 12 is disposed in parallel with the Y axis, and a primary side coil 13 is wound around the central axis of the primary side core 12 along the outer peripheral surface of the primary side core 12.

  When the secondary device 2 is placed at an arbitrary position on the inclined surface 401, the secondary device 2 rolls on the inclined surface 401 and comes into contact with the bottom 402 of the recess 410 and stops. At this time, the central axis CX of the secondary device 2 is parallel to the upper surface of the primary core 12. As described above, the secondary device 2 comes into contact with the bottom portion 402 of the hollow portion 410 and stops, so that a space between the bottom portion 420 and the secondary device 2 is eliminated, and the primary core 12 is connected to the secondary device 2. Near the secondary coil. For this reason, since a secondary battery can be arrange | positioned in the place where the density of the magnetic flux which the primary side coil 13 generate | occur | produces is high, it can charge efficiently with little loss of energy.

  In the eleventh embodiment, the entire slope is formed using only the arc-shaped slope 401, but a plurality of stages of slopes including the arc-shaped slope 403 may be provided. FIG. 31 is a schematic cross-sectional view with the XZ coordinate plane of the primary side housing 10k ′ as a modification of the eleventh embodiment.

  The primary side housing 10k ′ has a linear inclined surface 402, an arc-shaped inclined surface 403, and a coupling surface 404 that connects the linear inclined surface 402 and the arc-shaped inclined surface 403 in the XZ coordinate plane. ing. The coupling surface 404 is a curved surface that couples between the linear slope 402 and the arcuate slope 403 and is opposite to the coupled slope 402. The coupling surface 404 is provided to form the entire slope so that the slope of the entire slope formed by the linear slope 402 and the arc-like slope 403 does not change suddenly.

  In addition, in the case where the entire slope is formed using only the arc-shaped slope, if the range in which the secondary device 2 can be placed (the length of the hollow portion in the X-axis direction) is increased, the curvature of the slope is reduced. It needs to be small. When the curvature of the slope becomes smaller, the bottom portion becomes closer to a flat surface, so that the central axis CX of the secondary side device 2 is shifted from the Y-axis direction, causing the secondary side device 2 to stop. In this case, the secondary side device 2 The area where the magnetic flux generated by the primary side coil 13 is linked to the secondary side coil is reduced by the amount of deviation, and the charging efficiency is reduced. In the modification of the eleventh embodiment, the entire slope is formed by a plurality of slopes, so that the user places the secondary device 2 when attempting to charge while increasing the curvature of the arcuate slope 403. Therefore, the convenience can be improved while suppressing a decrease in charging efficiency.

<< Twelfth embodiment >>
In the ninth embodiment, the two secondary devices 2 are charged using the _two primary cores 12i ₁ and 12i ₂ respectively. In the twelfth embodiment, three or more secondary devices are used. 2 will be described with reference to the drawings, with reference to the drawings.

  In the twelfth embodiment, a primary side casing 10 m is used as the primary side casing 10. FIG. 32 is an external perspective view of the primary housing 10m according to the twelfth embodiment. FIG. 33A is a schematic diagram of a cross section of the primary housing 10m having a cross section taken along the XZ coordinate plane. FIG. 33B is a top view of the primary housing 10k.

  The primary housing 10m is formed in a rectangular parallelepiped shape, and a plurality of depressions 411, 411,... Are arranged on the upper surface 420 of the primary housing 101 so as to be arranged in the X-axis direction. Each of the recessed portions 411, 411,... Is formed in the same shape as the recessed portion 401 of the eleventh embodiment. In addition, the recesses 411, 411,... Are arranged with the upper surface 420 of the primary housing 10m interposed therebetween.

  The arcuate slopes 412 that form the depressions 411 are formed symmetrically when viewed from the XZ coordinate plane. Here, the deepest recessed portion on the Z axis is referred to as a bottom portion 422. The bottom portion 422 of each primary housing 10m is in contact with the XY plane having a zero Z coordinate. At this time, each inclined surface 412 is the same position as the upper surface 405 in the Z-axis direction on the XZ coordinate plane, and has an elliptical curved surface centering on the position in contact with the bottom 422 of each inclined surface 412 in the X-axis direction. . Although the inclined surface 412 is elliptical in the XZ coordinate plane, a perfect circle shape or a curve such as a cycloid curve may be used.

  The primary core 12 is disposed inside the primary housing 10m and below the bottom portions 422, 422,. The primary side core 12 is a plate-like core having a thickness in the Z-axis direction, and the upper surface and the lower surface of the primary side core 12 are arranged in parallel to the horizontal plane. The primary side core 12 is disposed in parallel with the Y axis, and a primary side coil 13 is wound around the central axis of the primary side core 12 along the outer peripheral surface of the primary side core 12.

  Shield magnetic bodies 430, 430,... Are arranged inside the primary side casing 10m and below the upper surfaces 420, 420,. By doing in this way, the primary side core 12 will be arrange | positioned between each magnetic body 430,430 *. The shield magnetic body 430 is formed of a plate-like magnetic body having a thickness in the X-axis direction. The shield magnetic bodies 430, 430,... Are arranged in parallel to the Y-axis direction and are arranged with the primary core 12 sandwiched in the X-axis direction. The upper end portion (hereinafter referred to as the upper end portion) in the Z-axis direction when viewed from the XZ plane of the shielding magnetic body 430 is disposed above the slope forming the recess 411. The primary core 12 is disposed so as to be positioned at the center of the shielding magnetic body 430 in the Z-axis direction (the height direction of the primary housing 10m) when viewed from the XZ coordinate plane. The length in the Y-axis direction of the primary side core 12 and the shield magnetic body 430 is longer in the shield magnetic body 430 than in the primary side core 12 when viewed from the XY coordinate plane. The primary cores 12, 12,... And the shield magnetic bodies 430, 430,... Are the lengths of the primary cores 12, 12, .. and the shield magnetic bodies 430, 430,. The center of the height is located on the same straight line in the X-axis direction. For this reason, in the Y-axis direction, the primary core 12 is accommodated inside the shielding magnetic body 430.

  In the twelfth embodiment, the secondary side devices 2 arranged in the respective depressions 411, 411,... Are respectively used as primary side cores 12, 12,. To charge.

  FIG. 34 is a block diagram showing the configuration of the charging circuit of the primary device shown in the twelfth embodiment. The charging circuit 600 of the primary side device 1 includes a charging control unit 610 and primary side coils 13 and 13, and the charging control unit 610 includes a rectifier circuit 631, driving circuits 630, 630,. Prepare. The rectifier circuit 631 converts a commercial AC voltage supplied to the primary device 1 through an AC plug (not shown) provided in the primary device 1 into a DC voltage VDC. The primary side coils 13, 13,... Are connected to the drive circuits 630, 630,. The drive circuit 630 converts the DC voltage from the rectifier circuit 631 into an AC voltage, and supplies the AC exciting current to the primary coil 13 by applying the AC voltage to the primary coil 13. Specifically, the half-bridge resonant inverter circuit described with reference to FIG. 10 can be used. The control circuit 636 individually controls the oscillation state in the drive circuit 630 (specifically, individually controls the switches of the half-bridge resonant inverter circuit), thereby exciting the primary side coils 13, 13. Control current supply individually.

Next, specific installation of the charging control unit 610 and the primary side coils 13, 13... On the primary side casing 10 m will be described. FIG. 35 is a schematic diagram showing installation of the charging control unit and the primary side coil on the primary side casing with the XZ coordinate plane taken as a cross section. For simplicity, FIG. 35 omits the wiring that connects the primary coil 13 and the charging control unit 610. Primary housing 10m is divided into upper housing 10m ₁ and a lower housing 10m _2, and is formed to close to the lid of the lower housing 10m ₂ in the upper housing 10m _1. A convex portion 470 is formed on the inner wall of the lower housing 10 m _{2, and} an inner lid 460 is disposed on the convex portion 470. The inside of the primary housing 10m is divided into two upper and lower spaces by the inner lid 460. A magnetic body holding recess 461 and a core holding recess 462 are formed on the upper surface of the inner lid 460. The magnetic body holding recess 461 holds the shield magnetic body 430, and the core holding recess 462 holds the primary side core 12. The control board 450 is fixed to the bottom surface of the lower housing 10m ₂ using screws 451. In other embodiments, the charge control unit and the primary coil can be similarly arranged.

  As described above, one primary side core 12 is provided for each of the depressions 411, 411,... And a drive circuit 630 that supplies an alternating excitation current to the primary side coil 13 wound around each primary side core 12 is provided. It is possible to control the supply of alternating current to the primary side coil 13 and the frequency of the alternating current independently for each primary side coil, and charge control for each secondary side device 2 is possible. Become. Moreover, since the primary side core 12 is arrange | positioned between each magnetic body 430 for shielding, before the magnetic flux which the primary side coil 13 generate | occur | produces reaches the adjacent secondary side apparatus 2 or the primary side coil 13, it is a magnetic body. Therefore, it is possible to prevent the magnetic flux generated from the primary side coil 13 from interlinking with the secondary side device 2 and the primary side coil 13 arranged in the adjacent recess 411.

  Further, since the upper end portion (hereinafter referred to as the upper end portion) of the shielding magnetic body 430 is disposed above the slope forming the depression 411 in the Z-axis direction, the magnetic flux generated by the primary coil 13 is increased. Further, it is possible to further suppress the interlinkage with the secondary device 2 arranged in the adjacent recess 411.

  In addition, in the height direction of the primary side casing 10m, the primary side core 12 is disposed so as to be positioned at the center of the shielding magnetic body 430. Therefore, the primary side coil 13 is generated and viewed from the XZ coordinate plane. The magnetic flux that circulates from the vertical direction of the shielding magnetic body 430 to the secondary device 2 and the primary core 13 disposed in the adjacent recess 411 is induced to the magnetic body and is generated from the primary coil 13. It is possible to further suppress the magnetic flux from interlinking with the adjacent secondary device 2 and the primary core 13.

  Further, since the primary core 12 is disposed inside the shield magnetic body 430 in the Y-axis direction, the secondary side device 2 adjacent to the shield magnetic body 430 from the vertical direction when viewed from the XY coordinate plane. The magnetic flux that circulates to the primary side core 13 is induced to the magnetic body, and the magnetic flux generated from the primary side coil 13 is linked to the secondary side device 2 and the primary side core 13 that are disposed in the adjacent recesses 411. This can be further suppressed.

  The specific numerical values shown in the above description are merely examples, and as a matter of course, they can be changed to various numerical values. The following are modifications or annotations of the embodiment described above. The contents described below can be arbitrarily combined as long as there is no contradiction.

  In the above-described embodiment, it is assumed that the outer shape of the secondary device 2 is the same as that of an AA or AAA battery, but the outer shape of the secondary device 2 is AA and AA. It may be the same as that of a general-purpose dry battery other than the four types (for example, a single-type or single-type dry battery). Moreover, it is also possible to make the external shape of the secondary side apparatus 2 different from that of a general-purpose dry battery. Further, the secondary device 2 may be a cylindrical electric device (for example, a flashlight) using the secondary battery 21 as a drive source.

  In the above-described embodiment, for the sake of convenience and simplification, it is assumed that the outer shape of the primary side housing when the hollow portion is ignored is a rectangular parallelepiped shape, but the outer shape of the primary side housing is a rectangular parallelepiped. The shape is not limited (for example, a round egg shape may be used).

  Further, in order to clarify and clarify the structure example of the primary side casing, the primary side casing and the primary side core have a line-symmetric structure with respect to a certain coordinate axis (for example, the Z axis). Although expressions are provided as appropriate, the existence of such symmetry is not essential.

  In the above-described embodiment, the outer shape of the primary core is a plate shape, but the outer shape of the primary core may not be a plate shape. For example, it is possible to make the outer shape of the primary side core into a cylindrical shape. However, considering the charging efficiency, it is desirable that the outer shape of the primary side core is a plate.

  In the above-described embodiment, the secondary battery is provided in the secondary side device as a chargeable power storage unit. However, a power storage unit (for example, a capacitor) other than the secondary battery is used as the secondary side device instead of the secondary battery. It may be provided inside.

DESCRIPTION OF SYMBOLS 1 Primary side apparatus 2 Secondary side apparatus 10, 10a-10j Primary side housing | casing 12 Primary side core 13 Primary side coil 20 Secondary side housing | casing 21 Secondary battery 22 Magnetic film 23 Secondary side coil 24 Flexible substrate 100,110 120, 130, 150, 200, 201, 210-212, 220, 221, 230, 231, 250, 251, 410, 411 Recessed portions 101, 102, 111, 131a, 131b, 132a, 132b, 151, 152, 232-235, 401 Slope 118, 252 Core storage

Claims (8)

A primary side housing formed with a hollow portion on the outer peripheral surface including a slope on which a cylindrical secondary side device provided with a secondary side coil and a power storage unit rolls;
In order to charge the power storage unit by generating an induced electromotive force in the secondary side coil of the secondary side device that is arranged inside the primary side casing, rolls on the slope, and is arranged on the recess. And a primary side coil. Compared to the position of the secondary coil before the secondary device rolls on the slope, the position of the secondary coil after the secondary device rolls on the slope is the primary side. The contactless charger according to claim 1, wherein the primary coil is disposed so as to be close to a position of the coil. The primary coil is wound around a primary core;
The said primary side core is arrange | positioned in parallel with respect to the central-axis direction in the cylindrical shape of the said secondary side apparatus of the state which rolls on the said slope and is still on the said hollow part. The contactless charger according to claim 1 or 2. The primary coil is wound around a primary core;
The primary side housing has a core storage part for accommodating the primary side core therein,
The hollow portion is formed from the slope and a part of the core storage portion,
3. The contactless charger according to claim 1, wherein the core storage unit has a surface along a vertical surface that stops rolling of the secondary side device due to the inclined surface. 4. The non-contact charger according to claim 1, wherein a lower end of the slope is inclined with respect to a horizontal plane. On the outer peripheral surface of the primary housing, a plurality of dent portions each having an inclined surface are formed as the dent portions,
When a plurality of secondary devices each having a secondary coil and a power storage unit are disposed on the plurality of depressions, the primary coil is used to induce a secondary coil in each secondary device. 6. The non-contact charger according to claim 1, wherein electric power is generated to charge each power storage unit.   The said slope is formed by a curved surface in which the slope angle of the slope changes continuously, and the curvature of the bottom of the slope is smaller than the curvature of the outer periphery of the secondary device. A contactless charger according to any one of the above. The primary housing is provided with a plurality of the recessed portions arranged side by side,
The primary side coil is disposed below each of the plurality of depressions,
The shielding magnetic body is disposed between a pair of the primary coils disposed below each of the adjacent recesses among the plurality of recesses. Item 8. The non-contact charger according to any one of Items 7.

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