JP3169797U - Coil unit - Google Patents

Abstract

A coil unit that is thin and capable of increasing strength is provided. An inner drawing recess is recessed with respect to a coil arrangement surface and extends from an inner edge side of the coil arrangement surface to an outer edge of a magnetic plate across a surrounding portion. The inner lead wire 42 of the coil 40 is drawn from one end (inner end) of the annular main body 41 and passes between the magnetic plate 20 and the annular main body 41 from the inner side of the coil 40 to the outer side of the magnetic plate 20. It extends and is located in the inner drawer recess 25. [Selection] Figure 1

Description

  The present invention relates to a coil unit capable of converting a magnetic field and a current.

  Non-contact charging is known as a method for charging an electronic device that operates on a battery. Non-contact charging has a great merit that there is no troublesome connector connection, and mobile phones capable of non-contact charging have been commercialized. For non-contact charging, a coil unit capable of converting a magnetic field and a current is used.

  In a flat coil (single-winding coil) generally used in a coil unit, it is necessary to pass a lead wire at the end from the inside to the outside of the coil. As shown in an enlarged view in FIG. 7, this passing portion has two conductive wires overlapping in the thickness direction. For this reason, even if the coil is made thin so as to have the thickness of one wire diameter, the thickness of the portion (overlapping portion) that passes the lead wire from the inside to the outside of the coil is twice the wire diameter of the coil. Become.

  The following Patent Document 1 discloses a coil with a magnetic shielding sheet used as a power receiving coil of a mobile phone for performing charging by contactless power transmission. In this coil with a magnetic shielding sheet, for the purpose of reducing the thickness, the winding start terminal 5 protruding in the thickness direction is joined to the magnetic shielding sheet 3 in a state of being matched with the slit 4 of the magnetic shielding sheet 3 (see FIG. 1 of Patent Document 1). reference).

JP 2008-210861 A

  Even if the coil with the magnetic shielding sheet of Patent Document 1 can be thinned, there is a problem that the strength of the magnetic shielding sheet and thus the product is reduced due to the slit provided in the magnetic shielding sheet.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a coil unit that can be increased in strength as compared with the technique of Patent Document 1 while being thin.

One embodiment of the present invention is a coil unit. This coil unit
Comprising a magnetic plate and a coil provided on the magnetic plate;
The coil has an annular main body provided on one surface of the magnetic plate, and at least two lead wires drawn from the annular main body.
The two lead wires include, on the magnetic plate, an inner lead wire that extends from the inside of the coil to the outside of the magnetic plate, and an outer lead wire that extends from the outside of the coil to the outside of the magnetic plate,
On one surface of the magnetic plate is formed a recess for drawing that crosses the coil placement surface from the inside to the outside,
The inner lead wire extends outwardly between the magnetic plate and the annular main body, and a portion between the magnetic plate and the annular main body is located in the drawer recess.

Another aspect of the present invention is also a coil unit. This coil unit
Comprising a magnetic plate and a coil provided on the magnetic plate;
One surface of the magnetic plate includes an annular coil placement surface, a core portion that is inside the coil placement surface and rises from the coil placement surface, and is recessed with respect to the coil placement surface and is within the coil placement surface. A drawer recess extending from the edge side to the outer edge side,
The coil includes an annular main body provided on the coil placement surface so as to surround the core, and at least two lead wires drawn from the annular main body.
The two lead wires include, on the magnetic plate, an inner lead wire that extends from the inside of the coil to the outside of the magnetic plate, and an outer lead wire that extends from the outside of the coil to the outside of the magnetic plate,
The inner lead wire extends outwardly between the magnetic plate and the annular main body, and a portion between the magnetic plate and the annular main body is located in the drawer recess.

The one surface of the magnetic plate is a surrounding portion that rises from the coil arrangement surface so that the periphery of the coil arrangement surface surrounds the coil arrangement surface,
A recess that accommodates the inner lead wire and the outer lead wire may be provided across the enclosure so as to pass the coil placement surface and the outer edge of the magnetic plate.

  The upper surfaces of the core part and the surrounding part may be flat surfaces having the same height.

  The drawing recess may extend to the outer edge of the magnetic plate, and the inner drawing line may be located in the drawing recess also outside the annular main body.

  As for the said recessed part for drawer | drawing-out, only the presence position of the said inside leader line may be dented with respect to the said coil arrangement | positioning surface.

  The coil may be a planar coil, and the annular main body portion may have a thickness of one wire diameter and be present within a height range of the core portion from the coil placement surface.

  The depth of the coil arrangement surface with respect to the core portion may be greater than or equal to the wire diameter of the coil.

  The depth of the recess for drawing out with respect to the coil placement surface may be greater than or equal to the wire diameter of the coil.

Another aspect of the present invention is also a coil unit. This coil unit
Comprising a magnetic plate and a coil provided on the magnetic plate;
One surface of the magnetic plate is an annular coil arrangement surface, a core portion that is inside the coil arrangement surface and rises from the coil arrangement surface, and an enclosure that rises from the coil arrangement surface so as to surround the coil arrangement surface And a recess for drawing that is recessed with respect to the coil placement surface and extends from the inner edge side of the coil placement surface to the outer edge of the magnetic plate,
The coil includes an annular main body provided on the coil placement surface so as to surround the core, and at least two lead wires drawn from the annular main body.
The two lead wires include, on the magnetic plate, an inner lead wire that extends from the inside of the coil to the outside of the magnetic plate, and an outer lead wire that extends from the outside of the coil to the outside of the magnetic plate,
The inner lead line extends outside through the magnetic plate and the annular main body portion, and a portion located between the magnetic plate and the annular main body portion and a portion outside the annular main body portion. Are located in the drawer recess,
A recess that accommodates the inner lead wire and the outer lead wire is provided across the enclosure so as to pass the coil placement surface and the outer edge of the magnetic plate,
The upper surfaces of the core portion and the surrounding portion are flat surfaces having the same height,
The coil is a planar coil, and the annular main body portion has a thickness of one wire diameter and exists within the height range of the core portion from the coil placement surface,
A depth of the coil placement surface with respect to the core portion is equal to or greater than a wire diameter of the coil, and a depth of the recess for extraction with respect to the coil placement surface is equal to or greater than a wire diameter of the coil;
A protective member is laminated on the surface of the magnetic plate on the side where the coil is disposed.

  The magnetic plate may be an integral ferrite fired product.

  The magnetic plate may be one in which iron powder and resin are kneaded and solidified.

  Any combination of the above components is also effective as an aspect of the present invention.

  According to the present invention, the inner lead wire extends outwardly between the magnetic plate and the annular main body portion of the coil, and a portion between the magnetic plate and the annular main body portion serves as a drawer recess. Therefore, it is possible to realize a coil unit that is thin and capable of increasing the strength as compared with the technique of Patent Document 1.

The disassembled perspective view of the coil unit which concerns on Embodiment 1 of this invention. FIG. 2A is a plan view of a coil of the coil unit. FIG. 2B is a plan view of the magnetic plate of the coil unit. FIG. 2C is a plan view of a state where a coil is arranged on a magnetic plate. FIG. 2D is a cross-sectional view taken along the line DD of FIG. FIG. 3A is a plan view of a magnetic plate of a coil unit according to Embodiment 2 of the present invention. FIG. 3B is a plan view showing a state where a coil is arranged on the magnetic plate shown in FIG. FIG. 3C is a cross-sectional view taken along the line CC of FIG. FIG. 4A is a plan view of a magnetic plate of a coil unit according to Embodiment 3 of the present invention. FIG. 4B is a plan view of a state where a coil is arranged on the magnetic plate shown in FIG. FIG. 4C is a cross-sectional view taken along the line CC of FIG. FIG. 5 (A) is a plan view of a magnetic plate of a coil unit according to Embodiment 4 of the present invention. FIG. 5B is a plan view showing a state where a coil is arranged on the magnetic plate shown in FIG. FIG. 5C is a cross-sectional view taken along the line CC of FIG. FIG. 6A is a plan view of a magnetic plate of a coil unit according to Embodiment 5 of the present invention. FIG. 6B is a plan view of a state where a coil is arranged on the magnetic plate shown in FIG. FIG. 6C is a cross-sectional view taken along the line CC in FIG. The enlarged view of the leader line part of a planar coil.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. Further, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 is an exploded perspective view of a coil unit 10 according to Embodiment 1 of the present invention. FIG. 2A is a plan view of the coil 40 of the coil unit 10. FIG. 2B is a plan view of the magnetic plate 20 of the coil unit 10. FIG. 2C is a plan view of a state where the coil 40 is disposed on the magnetic plate 20. FIG. 2D is a DD cross-sectional view of FIG. The coil unit 10 of the present embodiment is a thin cored coil unit that includes a magnetic shield, a core, and a coil. Details will be described below.

  As shown in FIG. 1, the coil unit 10 includes a magnetic plate 20, a coil 40, and sheet-like protection members 60 and 70. The magnetic plate 20 may be a unitary ferrite fired product, or may be a compacted iron core obtained by kneading iron powder and a resin, and is preliminarily molded into the shape shown in FIG. In the case of the latter (a compacted iron core obtained by kneading iron powder and resin together), firing is unnecessary and higher dimensional accuracy can be expected.

  One surface of the magnetic plate 20 includes a coil placement surface 21, a core portion 22, a surrounding portion 23, an inner drawer recess 25, and an outer drawer recess 27. The coil placement surface 21 is an annular (square annular in the example of the figure) plane. The core portion 22 that functions as a core is inside the coil placement surface 21 and rises from the coil placement surface 21. The surrounding portion 23 is around the coil placement surface 21 and rises from the coil placement surface 21 so as to surround the coil placement surface 21. The upper surfaces of the core portion 22 and the surrounding portion 23 are the main surfaces of the magnetic plate 20 and are flat surfaces having the same height. The inner drawing recess 25 is recessed with respect to the coil placement surface 21 and extends from the inner edge side of the coil placement surface 21 to the outer edge of the magnetic plate 20 across the surrounding portion 23 (in the example of the figure, the inner edge of the coil placement surface 21). And the outer edge of the magnetic plate 20). The outer lead-out recessed portion 27 is recessed with respect to the surrounding portion 23 and passes the outer edge of the coil placement surface 21 and the outer edge of the magnetic plate 20. The other surface of the magnetic plate 20 is a flat surface and functions as a magnetic shield.

  The coil 40 that is a planar coil (single-winding coil) has, for example, a rectangular annular main body 41, an inner lead wire 42, and an outer lead wire 43. The annular main body portion 41 is provided on the coil placement surface 21 so as to surround the core portion 22 a plurality of times (multiple times). The annular main body 41 is formed thin and planar so as to have a thickness corresponding to one wire diameter. The inner lead wire 42 is drawn from one end (inner end portion) of the annular main body 41, passes between the magnetic plate 20 and the annular main body 41, extends from the inside of the coil 40 to the outer side of the magnetic plate 20, and Located in the drawer recess 25. The outer lead wire 43 is drawn from the other end (outer end portion) of the annular main body 41 and extends from the outside of the coil 40 to the outside of the magnetic plate 20 through the outer drawing recess 27.

  As shown in FIG. 2D, the depth of the coil placement surface 21 with respect to the core portion 22 is equal to or greater than the wire diameter of the coil 40. Further, the depth of the inner drawing recess 25 with respect to the coil placement surface 21 is also equal to or larger than the wire diameter of the coil 40. The annular main body portion 41 of the coil 40 exists within the height range of the core portion 22 from the coil placement surface 21. The bottom surface of the outer lead-out recessed portion 27 and the coil placement surface 21 form a continuous plane.

  The protection members 60 and 70 have a sheet shape that is substantially the same shape as the magnetic plate 20 when viewed in the vertical direction, and are laminated on the upper and lower surfaces of the magnetic plate 20 by bonding or the like. The protective members 60 and 70 may be made of, for example, PET (polyethylene terephthalate) bonded with an adhesive, or a UV solidifying coating agent.

  According to the present embodiment, the following effects can be achieved.

(1) The inner lead wire 42 has a structure in which an inner lead recess 25 is provided in the magnetic plate 20 to draw the inner lead wire 42 from the inner side to the outer side. The strength of the plate 20 and thus the entire coil unit can be increased.

(2) Although it is difficult to form a shape having a slit as in Patent Document 1 as a magnetic plate, this embodiment is preferable because it is easy to mold because a slit is unnecessary.

(3) Since the overlapping portion of the annular main body portion 41 and the inner lead wire 42 on the magnetic plate 20 serves as the inner lead recess 25, it is possible to prevent the overlapping portion from protruding upward. For this reason, compared with the case where the recessed part 25 for inside drawer | drawing-out is not provided, if it is the same product thickness, the thickness of the magnetic board 20 can be ensured large and a characteristic can be improved. Further, if the thickness of the magnetic plate 20 is the same, the product thickness can be reduced by about 30%.

(4) Since the upper surfaces of the core portion 22 and the surrounding portion 23 are flat surfaces having the same height, the upper protective member 60 can be easily attached and workability is good.

  FIG. 3A is a plan view of the magnetic plate 20 of the coil unit according to Embodiment 2 of the present invention. This magnetic plate 20 is different from the one shown in FIG. 2B in that the outer drawer recess 27 has the same shape as the inner drawer recess 25, and the other points are the same. That is, the outer lead-out recessed portion 27 is recessed with respect to the coil placement surface 21 and extends from the inner edge side of the coil placement surface 21 to the outer edge of the magnetic plate 20 across the surrounding portion 23.

  FIG. 3B is a plan view showing a state where the coil 40 is arranged on the magnetic plate 20 shown in FIG. FIG. 3C is a cross-sectional view taken along the line C-C in FIG. In the present embodiment, the elements other than the magnetic plate 20 are the same as those in the first embodiment. This embodiment also has the same effects as those of the first embodiment. In addition, since both the inner drawing recess 25 and the outer drawing recess 27 are recessed with respect to the coil placement surface 21, the inner lead wire 42 that overlaps the annular main body 41 can be arranged in any recess. There is also.

  FIG. 4A is a plan view of the magnetic plate 20 of the coil unit according to Embodiment 3 of the present invention. This magnetic plate 20 has the same structure as that shown in FIG. 3A in that the inner drawer recess 25 and the outer drawer recess 27 shown in FIG. ) And the other points are the same.

  FIG. 4B is a plan view showing a state where the coil 40 is disposed on the magnetic plate 20 shown in FIG. FIG. 4C is a cross-sectional view taken along the line C-C in FIG. In the present embodiment, the elements other than the magnetic plate 20 are the same as those in the second embodiment. This embodiment also has the same effects as those of the first embodiment. There is also an advantage that the positions of the inner lead line 42 and the outer lead line 43 can be exchanged. Furthermore, the molding shape of the magnetic plate 20 may be the simplest.

  FIG. 5A is a plan view of the magnetic plate 20 of the coil unit according to Embodiment 4 of the present invention. This magnetic plate 20 is different from that shown in FIG. 4A in that the surrounding portion 23 is eliminated from that shown in FIG. 4A, and the other points are the same. The main surface of the magnetic plate 20 is only the upper surface of the core portion 22.

  FIG. 5B is a plan view showing a state where the coil 40 is disposed on the magnetic plate 20 shown in FIG. FIG. 5C is a cross-sectional view taken along the line CC of FIG. In the present embodiment, the elements other than the magnetic plate 20 are the same as those in the third embodiment. Although the first to third embodiments are more suitable for attaching the protective member 60 (see FIG. 1) to the upper surface, the same effects can be achieved in other respects. Further, the amount of material used for the magnetic plate 20 can be reduced, and there is an advantage of weight reduction. In this embodiment, the problem of sticking difficulty can be avoided by using a UV solidifying coating agent as the protective member 60.

  FIG. 6A is a plan view of the magnetic plate 20 of the coil unit according to Embodiment 5 of the present invention. This magnetic plate 20 is different from that shown in FIG. 5A in that the core portion 22 is eliminated from that shown in FIG. 5A, and the portion other than the drawing recess 28 is entirely planar. . The width of the drawer recess 28 is narrowed to the same extent as the inner drawer recess 25 of FIG. The other points are the same as those shown in FIG.

  FIG. 6B is a plan view showing a state where the coil 40 is disposed on the magnetic plate 20 shown in FIG. FIG. 6C is a cross-sectional view taken along the line C-C in FIG. In the present embodiment, the elements other than the magnetic plate 20 are the same as those in the fourth embodiment. Although the fourth embodiment is superior in terms of magnetic characteristics, the same effects can be achieved in other respects. Further, the amount of material used for the magnetic plate 20 can be minimized, and there is an advantage of weight reduction.

  The present invention has been described above by taking the embodiment as an example, but it will be understood by those skilled in the art that various components and processing processes of the embodiment can be variously modified and combined within the scope of the claims. It is where it is done.

  If the portion located below the annular main body 41 of the coil 40 is recessed with respect to the coil placement surface 21 of the magnetic plate 20, the other portion (the portion that crosses the surrounding portion 23) For example, it may be the same depth as the outer drawer recess 27.

DESCRIPTION OF SYMBOLS 10 Coil unit 20 Magnetic board 21 Coil arrangement | positioning surface 22 Core part 23 Enclosure part 25 Inner drawing recessed part 27 Outer drawing recessed part 40 Coil 41 Annular body part 42 Inner drawing line 43 Outer drawing line 60,70 Protective member

Claims (12)

Comprising a magnetic plate and a coil provided on the magnetic plate;
The coil has an annular main body provided on one surface of the magnetic plate, and at least two lead wires drawn from the annular main body.
The two lead wires include, on the magnetic plate, an inner lead wire that extends from the inside of the coil to the outside of the magnetic plate, and an outer lead wire that extends from the outside of the coil to the outside of the magnetic plate,
On one surface of the magnetic plate is formed a recess for drawing that crosses the coil placement surface from the inside to the outside,
The inner lead wire extends outwardly between the magnetic plate and the annular main body portion, and a portion located between the magnetic plate and the annular main body portion is located in the drawer recess. unit. Comprising a magnetic plate and a coil provided on the magnetic plate;
One surface of the magnetic plate includes an annular coil placement surface, a core portion that is inside the coil placement surface and rises from the coil placement surface, and is recessed with respect to the coil placement surface and is within the coil placement surface. A drawer recess extending from the edge side to the outer edge side,
The coil includes an annular main body provided on the coil placement surface so as to surround the core, and at least two lead wires drawn from the annular main body.
The two lead wires include, on the magnetic plate, an inner lead wire that extends from the inside of the coil to the outside of the magnetic plate, and an outer lead wire that extends from the outside of the coil to the outside of the magnetic plate,
The inner lead wire extends outwardly between the magnetic plate and the annular main body portion, and a portion located between the magnetic plate and the annular main body portion is located in the drawer recess. unit. The one surface of the magnetic plate is a surrounding portion that rises from the coil arrangement surface so that the periphery of the coil arrangement surface surrounds the coil arrangement surface,
3. The coil unit according to claim 2, wherein a recess that accommodates the inner lead wire and the outer lead wire is provided across the surrounding portion so as to pass the coil placement surface and an outer edge of the magnetic plate. .   The coil unit according to claim 3, wherein the upper surfaces of the core portion and the surrounding portion are flat surfaces having the same height.   The said drawer | drawing-out recessed part is extended to the outer edge of the said magnetic board, and the said inner side drawer | drawing-out line | wire is located in the said recessed part for drawer | drawing-out also in the outer side of the said cyclic | annular main-body part. Coil unit.   6. The coil unit according to claim 1, wherein only the position where the inner lead wire exists is recessed with respect to the coil arrangement surface.   7. The coil according to claim 2, wherein the coil is a planar coil, and the annular main body portion has a thickness of one wire diameter and exists within the height range of the core portion from the coil arrangement surface. The coil unit according to item.   The coil unit according to any one of claims 2 to 7, wherein a depth of the coil arrangement surface with respect to the core portion is equal to or greater than a wire diameter of the coil.   The coil unit according to any one of claims 1 to 8, wherein a depth of the drawing recess with respect to the coil placement surface is equal to or greater than a wire diameter of the coil. Comprising a magnetic plate and a coil provided on the magnetic plate;
One surface of the magnetic plate is an annular coil arrangement surface, a core portion that is inside the coil arrangement surface and rises from the coil arrangement surface, and an enclosure that rises from the coil arrangement surface so as to surround the coil arrangement surface And a recess for drawing that is recessed with respect to the coil placement surface and extends from the inner edge side of the coil placement surface to the outer edge of the magnetic plate,
The coil includes an annular main body provided on the coil placement surface so as to surround the core, and at least two lead wires drawn from the annular main body.
The two lead wires include, on the magnetic plate, an inner lead wire that extends from the inside of the coil to the outside of the magnetic plate, and an outer lead wire that extends from the outside of the coil to the outside of the magnetic plate,
The inner lead line extends outside through the magnetic plate and the annular main body portion, and a portion located between the magnetic plate and the annular main body portion and a portion outside the annular main body portion. Are located in the drawer recess,
A recess that accommodates the inner lead wire and the outer lead wire is provided across the enclosure so as to pass the coil placement surface and the outer edge of the magnetic plate,
The upper surfaces of the core portion and the surrounding portion are flat surfaces having the same height,
The coil is a planar coil, and the annular main body portion has a thickness of one wire diameter and exists within the height range of the core portion from the coil placement surface,
A depth of the coil placement surface with respect to the core portion is equal to or greater than a wire diameter of the coil, and a depth of the recess for extraction with respect to the coil placement surface is equal to or greater than a wire diameter of the coil
A coil unit in which a protective member is laminated on the surface of the magnetic plate on the side where the coil is disposed.   The coil unit according to any one of claims 1 to 10, wherein the magnetic plate is an integrally sintered ferrite product.   The coil unit according to any one of claims 1 to 11, wherein the magnetic plate is obtained by kneading iron powder and a resin to be integrally hardened.

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