JP5045858B1 - Non-contact charging module manufacturing method and non-contact charging module - Google Patents

Abstract

Provided are a non-contact charging module and a method for manufacturing the same, which achieves the flexibility of the magnetic sheet and achieves strong adhesion between the magnetic sheet and a conductor by adopting a magnetic sheet divided into small pieces. Objective.
A plurality of slits are formed on one surface of a magnetic sheet, the magnetic sheet is baked, and a sheet holding the magnetic sheet is bonded to both sides of the magnetic sheet. A method for manufacturing a non-contact charging module, wherein a slit is formed by pressurizing and a planar coil portion around which a conducting wire is wound is bonded to one surface side of the magnetic sheet 3 via the sheet.
[Selection] Figure 4

Description

  The present invention relates to a method for manufacturing a contactless charging module having a planar coil portion and a magnetic sheet, and a contactless charging module.

  In recent years, many devices that can charge the main device in a non-contact manner with a charger have been used. In this method, a power transmission coil is arranged on the charger side, a power reception coil is arranged on the main device side, and electromagnetic induction is generated between the two coils to transmit power from the charger side to the main device side. It has also been proposed to apply a mobile terminal device or the like as the main device.

  The non-contact charging module used for the main device such as the portable terminal device and the charger is required to be thin and small. In order to meet this demand, it is conceivable that this type of non-contact charging module includes a planar coil portion as a power transmission coil or a power reception coil, and a magnetic sheet, as in (Patent Document 1). Moreover, regarding the magnetic sheet, there is a sheet having a flexibility by inserting a slit as in (Patent Document 2).

JP 2006-42519 A Japanese Patent No. 4400509

  The magnetic sheet employed in the non-contact charging module described in (Patent Document 1) is a flat magnetic sheet and has a problem that it does not have flexibility. For this reason, depending on how the non-contact charging module is handled, the magnetic sheet is damaged and the characteristics change, making it difficult to stabilize the characteristics.

  For this reason, mounting a magnetic sheet having flexibility by inserting a slit described in (Patent Document 2) on this type of non-contact charging module has been studied. However, since the adhesion between the conducting wire and the magnetic sheet is due to point contact, there is a problem of strong adhesion between the slit-containing magnetic sheet and the conducting wire.

  Therefore, in view of the above problems, the present invention employs a flexible magnetic sheet that is divided into small pieces to prevent the magnetic sheet from being damaged and adversely affecting its characteristics, and It is an object of the present invention to provide a method for manufacturing a non-contact charging module and a non-contact charging module that achieves strong adhesion between a magnetic sheet and a conductive wire.

  In order to solve the above-mentioned problems, the present invention forms a plurality of cuts in the first surface of the magnetic sheet, fires the magnetic sheet, and the first surface and the first surface of the magnetic sheet Is a slit that divides the magnetic sheet in the plurality of cuts by bonding a sheet holding the magnetic sheet to each of the opposite second surfaces and applying pressure from the second surface side of the magnetic sheet. And a planar coil portion around which a conducting wire is wound via the sheet is bonded to the first surface side of the magnetic sheet.

  According to the present invention, by adopting a flexible magnetic sheet that is divided into small pieces, the magnetic sheet is prevented from being damaged and adversely affecting the characteristics, and the magnetic sheet and the coil are brought into close contact with each other. Thus, it is possible to provide a non-contact charging module manufacturing method and a non-contact charging module that achieves improved characteristics and stability by being fixed.

Assembly drawing of the non-contact charging module in the embodiment of the present invention The front view of the non-contact charge module in an embodiment of the invention The figure which shows the process order which adhere | attaches the magnetic sheet and flat coil of the non-contact charge module in embodiment of this invention The conceptual diagram of the non-contact charge module in embodiment of this invention The block diagram which shows the non-contact electric power transmission apparatus in embodiment of this invention The figure which shows the structure of the non-contact charger in embodiment of this invention The figure which shows the structure of the portable terminal device in embodiment of this invention

  According to the first aspect of the present invention, a plurality of cuts are formed in the first surface of the magnetic sheet, the magnetic sheet is fired, and the first surface and the first surface of the magnetic sheet are opposite to each other. A sheet for holding the magnetic sheet is bonded to each of the second surfaces of the magnetic sheet, and a slit for dividing the magnetic sheet at the plurality of cuts is formed by applying pressure from the second surface side of the magnetic sheet. A method for manufacturing a non-contact charging module, comprising: bonding a planar coil portion around which a conductive wire is wound via the sheet to the first surface side of the magnetic sheet, wherein the magnetic sheet is manufactured. By avoiding the surfaces of the protrusions that are sometimes formed, the coil is bonded to a magnetic sheet that does not have protrusions, so that no inclination of the coil surface is generated. In addition, the coil floating that occurs when the protrusion is bonded to the surface does not occur. As a result, the magnetic sheet and the coil can be securely and flatly bonded, power transmission of the non-contact charging module can be reliably performed, and characteristic fluctuations can be reduced against damage such as vibration and dropping. be able to. In addition, by bringing the magnetic sheet and the coil into close contact with each other, the distance between the magnetic sheet and the coil can be reduced, the effect of improving the transmission efficiency of the coil by the magnetic sheet can be improved, and the characteristics can be improved and stabilized.

  According to a second aspect of the present invention, there is provided a planar coil, a magnetic sheet on which the planar coil is placed on a first surface, and a second surface opposite to the first surface and the first surface of the magnetic sheet. The magnetic sheet includes a plurality of cuts in the first surface, a slit that divides the magnetic sheet through the plurality of cuts, and the second surface. In the non-contact charging module, the coil is bonded to a magnetic sheet having no protrusion, so that the inclination of the coil surface is not generated. In addition, the coil floating that occurs when the protrusion is bonded to the surface does not occur. As a result, the magnetic sheet and the coil can be securely and flatly bonded, power transmission of the non-contact charging module can be reliably performed, and characteristic fluctuations can be reduced against damage such as vibration and dropping. be able to. In addition, by bringing the magnetic sheet and the coil into close contact with each other, the distance between the magnetic sheet and the coil can be reduced, the effect of improving the transmission efficiency of the coil by the magnetic sheet can be improved, and the characteristics can be improved and stabilized.

(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an assembly diagram of a contactless charging module according to an embodiment of the present invention. FIG. 2 is a front view of the non-contact charging module according to the embodiment of the present invention. In FIG. 2, the wire diameters of the slits provided in the magnetic sheet 3 and the conductors of the coil 21 are very close to each other. However, the wire diameters of the conductors are actually about 0.25 to 0.35 mm and the slits are about 2 mm. It is. Of course, it is not limited to this value.

  As shown in FIGS. 1 and 2, the non-contact charging module 1 of the present invention includes a planar coil portion 2 and a magnetic sheet 3 on which the planar coil portion 2 is placed. The magnetic sheet 3 includes a plurality of cuts 35 on a first surface (the upper surface in FIG. 1) on which the planar coil unit 2 is placed, a slit that passes through the plurality of cuts 35 and divides the magnetic sheet 3 into a plurality of pieces, And a convex portion formed in the slit portion of the surface opposite to the surface of 1 (the lower surface in FIG. 1).

  The planar coil unit 2 includes a coil 21 in which a conductor is wound in a radial direction so as to draw a vortex on the surface, and terminals 22 and 23 provided at both ends of the coil 21. The coil 21 is obtained by winding a conducting wire in parallel on a plane, and a surface formed by the coil 21 is called a coil surface. In addition, the thickness direction is a stacking direction of the planar coil portion 2 and the magnetic sheet 3. In the present embodiment, the coil 21 is wound outward from a hollow portion having a diameter of 20 mm, and the outer diameter is 30 mm. When the coil 21 is wound in a circular shape, the diameter of the hollow portion is 10 to 30 mm, and the outer diameter is about 30 to 50 mm. When wound in a substantially square or substantially rectangular shape, one side of the rectangular hollow portion is about 10 to 25 mm, and the width of the outer side is about 30 to 50 mm.

  The coil 21 is wound into a donut shape. The coil 21 may be wound into a circle or an ellipse, or may be wound into a polygon or a rectangle. In the case of winding in a rectangular shape, the hollow portion of the coil 21 may become nearly circular as the outer shape becomes rectangular, even if it is rectangular. Moreover, the conducting wire of the planar coil part 2 may be a single wire or a litz wire, and may be laminated in the thickness direction or may be a single layer.

  When comparing a coil wound in a circle and a coil wound in a rectangle, it is assumed that the diameter of the circular coil and one side of the rectangular coil have the same width. At this time, since the diagonal width of the rectangular coil is larger than the diameter of the circular coil, the rectangular coil can secure a wider opening, and the L value of the coil can be improved. As a result, the transmission efficiency of the non-contact charging module 1 can be improved. On the other hand, the circular coil does not need angle adjustment, and if the coil on the primary side non-contact charging module side and the coil on the secondary side non-contact charging module side are aligned, they are related to each other's angle. Stable power transmission becomes possible without

  In addition, since the conducting wires are wound so as to leave a space between each other, the stray capacitance between the upper conducting wire and the lower conducting wire is reduced, and the AC resistance of the coil 21 can be kept small. Moreover, the thickness of the coil 21 can be suppressed by winding so that space may be packed.

  The magnetic sheet 3 is provided in order to improve the power transmission efficiency of non-contact charging using electromagnetic induction action and to reduce magnetic flux leakage to the back side of the magnetic sheet 3.

  The magnetic sheet 3 used in the present embodiment will be described with reference to FIG. FIG. 3 is a diagram showing a process sequence for bonding a magnetic sheet and a planar coil of the non-contact charging module according to the embodiment of the present invention. In particular, the reason why the protrusion 50 is formed on the back surface of the surface on which the cut 35 of the magnetic sheet 3 is formed will be described in detail.

  The manufacturing method of the non-contact charging module 1 in the present embodiment is a method of forming a plurality of cuts on one surface of a magnetic sheet, for example, a ferrite sheet (before firing), firing the ferrite sheet, A sheet holding a ferrite sheet is bonded to each of the surface and the other surface opposite to the one surface, and the ferrite sheet is divided into a plurality of cuts by pressing the other surface of the ferrite sheet. A slit is formed, and a planar coil portion around which a conductive wire is wound is bonded to one surface side of the ferrite sheet, and the planar coil portion is located at a position corresponding to the slit on the other surface in the pressing step. It adheres while avoiding the formed protrusions.

  First, in the first step (FIGS. 2A to 2B), the upper surface (first surface) of a ferrite green sheet (magnetic sheet before firing) having a thickness of 0.6 mm is 2.4 mm long, A notch 35 having a width of 2.4 mm and a depth of about 0.1 mm is provided by a cutter blade. The depth of the cut 35 may be about 0.05 mm to 0.2 mm. The width of the cut 35 is about 0.01 mm to 0.1 mm, and particularly preferably 0.03 mm to 0.08 mm. However, most of the adjacent small pieces after the break are in contact with each other at least partially.

  That is, although the magnetic sheet 3 and the coil 21 are separated from each other in the cut portion 35, the area occupied by the cut 35 is extremely small compared to the area of the magnetic sheet 3, so that there is almost no adverse effect on the coil 21 due to the separated portion.

  At this time, the cuts 35 are not limited to a lattice shape, and may not be a straight shape. Also, the two directions of the vertical direction and the horizontal direction are not necessarily required, and either one may be used. Further, as the cuts 35, a plurality of recesses (separated from each other) or a plurality of cuts (separated from each other) having a cross pattern like “+” may be formed. Further, as the notch 35, a plurality (a large number) of point-like recesses spaced apart from each other may be formed. The point-like recess may be any shape such as a circle or a polygon, and the width is preferably about 0.1 to 0.5 mm, and the distance between the point-like recesses is preferably about 1 mm. Depending on the thickness of the ferrite sheet, the ferrite sheet can be divided by using (as a trigger) the plurality of recesses and the plurality of cuts. However, by using a grid-like cut, slits that provide flexibility can be reliably and evenly formed. Further, the notch 35 may or may not penetrate through the ferrite sheet. Thereafter, the ferrite green sheet is fired in a state where the notches 35 and the recesses are formed.

  In the second step (FIG. 2 (b) to FIG. 2 (c)), an acrylic adhesive (0.06 mm thick) is formed on both surfaces (FIG. 2A surface, B surface) of the magnetic sheet 3 on which the cuts 35 are formed. A PET adhesive sheet 40 having a product name: 9313B (Sumitomo 3M [registered trademark]) is adhered and held. The adhesive sheet 40 protects the ferrite sheet and has a thickness of about 0.03 to 0.1 mm.

  In the third step (FIG. 2 (c) to FIG. 2 (d)), when divided by pressing with a roller or the like from the lower side (second surface side) (breaking), a V-shaped vertical and horizontal as shown in the figure. A slit 36 is formed (not shown in the figure, but the slit 36 is formed vertically and horizontally). That is, it is pressed from the back side where the notch 35 is not provided (the surface where the notch 35 is provided is the front surface). Accordingly, the back surface is pressed from below by a breaking means such as a roller, or the upper surface is turned upside down once and the back surface is pressed from above to break. The magnetic sheet 3 has flexibility due to the V-shaped vertical and horizontal slits 36 and is more difficult to break. The cuts 35 are formed in a square lattice shape, but may be other shapes such as a rectangle or a parallelogram. By making the cut 35 into a rectangular shape, the magnetic sheet 3 can have flexibility in two vertical and horizontal directions.

  Further, in the fourth step (FIGS. 2D to 2E), minute fragments are generated when the magnetic sheet 3 is pressed with a roller or the like and divided into the vertical and horizontal slits 36. That is, in order to break from the front surface to the back surface of the ferrite sheet starting from the notch, it is divided with the back side point A as the axis. Accordingly, since a large pressure is applied to the point A, minute fragments generated by rubbing adjacent small pieces at the point A accumulate at the point A. Further, when the back surface is pressed from below by a breaking means such as a roller, all the fine fragments generated at the time of division further accumulate at the point A. Projections that are a number of convex portions at positions corresponding to the vertical and horizontal slits 36 on the back surface (the B surface in FIG. 2) opposite to the surface (the A surface in FIG. 2) on which the cutter blade has been inserted due to the minute fragments. 50 (small debris) is generated. The height of the protrusion 50 is larger than the thickness of the adhesive sheet 40. Accordingly, even when the protrusion 50 is viewed through the adhesive sheet 40, the protrusion 50 is sufficiently undulated as a protrusion.

  In the fifth step (FIGS. 2 (e) to 2 (f)), the A surface where the protrusion 50 is not generated and the coil 21 are bonded using an adhesive. In this way, the coil 21 is bonded to the A surface of the magnetic sheet 3 where no protrusion is generated while avoiding the B surface where the protrusion 50 is generated, so that the inclination of the surface of the coil 21 does not occur and there is a protrusion. The coil 21 is not lifted when it is bonded to the surface. As a result, the magnetic sheet 3 and the coil 21 can be securely and flatly bonded, and the power transmission of the non-contact charging module 1 can be reliably performed. Moreover, the whole space | interval of the coil 21 and the magnetic sheet 3 can be made substantially uniform, and the influence on the coil 21 by the magnetic sheet 3 can be improved stably.

  Also, a plurality of cuts were made on the A surface of the magnetic sheet 3, tape was applied to both surfaces (A surface and B surface) of the magnetic sheet 3, and the flat surface (B surface) was pressurized to create the vertical and horizontal slits 36. Therefore, it is possible to prevent a small piece generated when the cut 35 is made in the magnetic sheet 3 from being confined in the magnetic sheet 3 and attached to the surface (A surface side) of the magnetic sheet 3.

  Next, the effect when the vertical and horizontal slits 36 are provided in the magnetic sheet 3 will be described. In the case of the planar coil portion 2 using the magnetic sheet 3 without the vertical and horizontal slits 36, the L value after giving damage such as vibration to the magnetic sheet 3 as compared with the L value of the normal product (inductance value of the coil 21) is 5 In the case of the planar coil portion 2 using the magnetic sheet 3 having the vertical and horizontal slits 36, the L value after giving the same damage to the magnetic sheet 3 hardly changes. Thus, by providing the vertical and horizontal slits 36 in the magnetic sheet 3, it is possible to reduce the change in the L value of the planar coil portion 2 with respect to damage such as vibration and dropping.

  In addition, although the thickness of the magnetic sheet 3, the depth of blade insertion to the magnetic sheet 3, and the space | interval of the vertical / horizontal slit 36 described the typical numerical value by embodiment, it is not necessarily limited to this. The thickness of the magnetic sheet 3 is 0.1 to 1 mm, the depth of blade insertion into the magnetic sheet 3 is preferably less than half of the thickness of the magnetic sheet 3, and the interval between the vertical and horizontal slits 36 is preferably 5 mm or less. In addition, as shown in FIG. 2, the magnetic sheet 3 has V-shaped vertical and horizontal slits 36 formed vertically and horizontally at intervals of 2 mm in the thickness direction of the magnetic sheet in order to provide flexibility of the sheet. The shape may be any shape as long as it is formed in a groove shape, for example, a U shape.

  Next, the non-contact charging module of the present invention will be described with reference to FIG. 4A and 4B are conceptual diagrams of the contactless charging module according to the embodiment of the present invention, in which FIG. 4A is a top view, FIG. 4B is a cross-sectional view as viewed from the direction B-B in FIG. (c) And (d) is sectional drawing seen from CC direction of Fig.4 (a). As shown in FIG. 4, the non-contact charging module 1 of the present invention includes a planar coil portion 2 in which a conducting wire is wound in a spiral shape, and a magnet provided so as to face the surface of a coil 21 of the planar coil portion 2. A sheet 3 is provided. The coil 21 of the planar coil portion 2 is bonded to the surface of the magnetic sheet 3 where no protrusion 50 is generated using an adhesive or a double-sided sheet. The adhesive and the double-sided sheet need only be provided between the coil 21 of the planar coil portion 2 and the magnetic sheet 3, and need not be provided on the entire surface of the magnetic sheet. When it is provided over the entire surface, a cover or the like may be used to prevent other dust from adhering.

  In addition, although the cross section of the coil 21 is a conducting wire having a circular shape, a conducting wire having a square shape or the like may be used. However, in the case of a conductor having a circular shape compared to a conductor having a rectangular cross section, a gap is formed between adjacent conductors, so that the stray capacitance between the conductors is reduced, and the AC resistance of the coil 21 can be kept small. it can. Moreover, if it is a litz wire, the skin effect can be suppressed and efficient electric power transmission is attained. This is because power transmission for non-contact power reception is performed at about 100 kHz to 200 kHz, so that a reduction in power transmission efficiency due to the skin effect becomes a problem.

  In addition, the coil 21 is wound in one stage rather than being wound in two stages in the thickness direction, so that the alternating current resistance of the coil 21 is lowered and transmission efficiency can be increased. This is because when a conducting wire is wound in two stages, stray capacitance is generated between the upper conducting wire and the lower conducting wire. Therefore, it is better to wind as many portions as possible in one stage, rather than winding the entire coil 21 in two stages. Moreover, it can reduce in thickness as the non-contact charge module 1 by winding in 1 step | paragraph. In addition, the loss in the coil 21 is prevented because the alternating current resistance of the coil 21 is low, and the power transmission efficiency of the contactless charging module 1 depending on the L value can be improved by improving the L value. However, by configuring in multiple stages, the number of turns of the coil 21 can be increased, and the L value of the coil 21 can be improved.

  In addition, although the terminals 22 and 23 may be close to each other or may be arranged apart from each other, the contactless module 1 is easier to mount when they are close to each other.

  In addition, the center part 32 of the magnetic sheet 3 may be the same surface as the flat part 31, and may be a convex shape, a concave shape, or a hollow cylinder. However, as the thickness of the magnetic sheet 3 is reduced, the L value of the planar coil portion 2 is reduced, and the power transmission efficiency is lowered and the effect of the magnetic shield is reduced. Therefore, the power transmission efficiency of the non-contact charging module 1 can be improved when the central portion 32 is formed with a protrusion corresponding to the height of the coil 21. Further, the convex portion may be made of a material different from that of the flat portion 31.

  Further, as shown in FIG. 4D, the concave portion 33 of the magnetic sheet 3 may be a slit 34, and the concave portion 33 or the slit 34 is not necessarily required. However, as shown in FIGS. 4C and 4D, by providing the recess 33 or the slit 34, the lead wire from the winding start point of the coil 21 to the terminal 23 (FIGS. 4C and 4D). ) Can be accommodated in the recess 33 or the slit 34, so that the non-contact charging module 1 can be thinned. That is, the concave portion 33 or the slit 34 is formed so as to be substantially perpendicular to the end portion of the magnetic sheet 3 and overlap with the tangent line on the outer periphery of the central portion 32. By forming the recess 33 or the slit 34 in this way, the terminals 22 and 23 can be formed without bending the conducting wire. In this case, the length of the recess 33 or the slit 34 is about 15 mm to 25 mm. However, the length of the recess 33 or the slit 34 depends on the inner diameter of the coil 21. Further, the concave portion 33 or the slit 34 may be formed in a portion where the end of the magnetic sheet 3 and the outer periphery of the central portion 32 are closest. Thereby, the formation area of the recessed part 33 or the slit 34 can be suppressed to the minimum, and the transmission efficiency of the non-contact charging module 1 can be improved. In this case, the length of the recess 33 or the slit 34 is about 5 mm to 15 mm. In either arrangement, the inner end of the recess 33 or the slit 34 is connected to the center 32. Moreover, you may make the recessed part 33 or the slit 34 into another arrangement | positioning.

  That is, it is desirable that the coil 21 has a one-stage structure as much as possible. In that case, all the turns in the radial direction of the coil 21 are made into a one-stage structure, or one part is made into a one-stage structure and the other part is made into a two-stage structure It is possible to do. Therefore, one of the terminals 22 and 23 can be pulled out from the outer periphery of the coil 21, but the other must be pulled out from the inside. Therefore, the part around which the coil 21 is wound and the foot part always overlap in the thickness direction. Accordingly, the concave portion 33 or the slit 34 may be provided in the overlapping portion, and the foot portion may be accommodated therein. In addition, a leg part means the part from the winding end of the coil 21 to the terminal 22 or 23. If it is the recessed part 33, since the through-hole and the slit 34 are not provided in the magnetic sheet 3, it can prevent that a magnetic flux leaks and can improve the electric power transmission efficiency of the non-contact charge module 1. FIG. On the other hand, in the case of the slit 34, the magnetic sheet 3 can be easily formed. When it is the recessed part 33, as shown in FIG.4 (c), it is not limited to the recessed part 33 in which a cross-sectional shape becomes a square shape, You may form circular arc shape or roundness. Further, even if the coil 21 has a one-stage configuration, the foot portion is not necessarily drawn out from the inside.

  In the present embodiment, a Ni—Zn ferrite sheet, a Mn—Zn ferrite sheet, a Mg—Zn ferrite sheet, or the like can be used as the magnetic sheet 3. The ferrite sheet can reduce the AC resistance of the coil 21 as compared with the amorphous metal magnetic sheet. However, amorphous metal may be used, and a soft magnetic material formed on a sheet is preferable.

  When the coil 21 is wound in a circular shape, the magnetic sheet 3 is perpendicular to the circumferential tangent of the inner circumference of the coil 21 surface, and the magnetic sheet 3 starts from the winding start or winding end of the coil surface. You may form the recessed part 33 or the slit 34 extended in the shortest distance to the edge part. Thereby, the formation area of the recessed part 33 or the slit 34 can be suppressed to the minimum, and the transmission efficiency of the non-contact charging module 1 can be improved. That is, by providing the concave portion 33 or the slit 34, a part of the magnetic sheet 3 is missing or thinned. Therefore, the magnetic flux leaks from the recess 33 or the slit 34, and the power transmission efficiency of the non-contact charging module may be somewhat reduced. Therefore, by reducing the formation area of the recess 33 to the minimum, it is possible to reduce the thickness while minimizing the leakage of magnetic flux and maintaining the power transmission efficiency of the non-contact charging device. In this case, the length of the straight portion 33b is about 5 mm to 10 mm. Even when the coil 21 is wound into a shape other than a circle such as a rectangle, the above-described effect can be obtained by forming the recess 33 or the slit 34 at the shortest distance. In addition, on the tangent line of the outer periphery of the center portion 32, the shape is parallel to the end portion of the magnetic sheet 3 in order to provide the shortest distance to the end portion of the magnetic sheet 3. Note that the coil 21 may be wound in a polygonal shape, and in that case, the coil 21 may be perpendicular to the shape of the space formed by the inner end of the surface of the coil 21 or its tangent line. The concave portion 33 or the slit 34 may be provided in a straight line extending from the end point to the end of the magnetic sheet 3 at the shortest distance.

  In FIG. 4, the concave portion 33 or the slit 34 is parallel to one pair of opposite end sides of the rectangular magnetic sheet 3 and is perpendicular to the other pair of opposite end sides. This is because the magnetic sheet 3 of the present embodiment is square. However, the shape of the magnetic sheet 3 is not limited to a square, and various shapes such as a circle and a polygon can be considered. Therefore, for example, the shape of the magnetic sheet 3 is polygonal, and the concave portion 33 or the slit 34 is perpendicular to the side against which one end of the concave portion 33 or the slit 34 abuts. 33 or the length of the slit 34 in the longitudinal direction can be minimized. In particular, the shape of the magnetic sheet 3 is square, parallel to one pair of opposing end sides of the magnetic sheet 3 and perpendicular to the other pair of opposing end sides, In the rectangular magnetic sheet that is easy to use, the area of the recess 33 or the slit 34 can be minimized. However, the concave portion 33 or the slit 34 may reach at an angle that intersects the side where one end of the concave portion 33 or the slit 34 abuts.

  From the above, the concave portion 33 or the slit 34 is provided in a portion where the coil 21 and the foot overlap, and the surface of the coil 21 is provided on the flat portion 31. The concave portion 33 or the slit 34 may be provided somewhat long or short, but it is preferable that at least 80% or more of the portion where the coil 21 and the foot overlap each other can be covered.

  In FIG. 4, the magnetic sheet 3 has a size of about 33 mm × 33 mm and a thickness of 0.6 mm. The thickness may be about 0.1 mm to 1 mm.

  In this way, the coil 21 is bonded to the surface of the magnetic sheet 3 where no protrusion is generated while avoiding the surface where the protrusion 50 is generated (the lower side of FIGS. 4C and 4D). The tilt of the surface of the coil 21 does not occur, and the floating of the coil 21 that occurs when the protrusion is bonded to the surface is not generated.

  The thickness of the sheet that protects the magnetic sheet 3 from both the upper surface (first surface) and the lower surface (second surface) of the magnetic sheet 3 is about 0.03 mm, generally 0.01 mm to It is about 0.1 mm. The height of the protrusion is about 0.05 mm, and is about 0.03 mm to 0.13 mm. As a result, since the thickness of the sheet is generally smaller than the height of the protrusion, the convex portion due to the protrusion is hardly absorbed by the sheet.

  Further, in the case of the planar coil portion 2 using the magnetic sheet 3 that is not divided into small pieces without the vertical and horizontal slits 36, the L value after giving damage such as vibration to the magnetic sheet 3 as compared with the L value of the normal product is In the case of the planar coil portion 2 using the magnetic sheet 3 having the vertical and horizontal slits 36, the L value after giving similar damage to the magnetic sheet 3 hardly changes, although it decreases by about 5%. Thus, by providing the vertical and horizontal slits 36 in the magnetic sheet 3, it is possible to reduce changes in the L value of the planar coil portion 2 against damage such as vibration and dropping, and to reduce changes in power transmission of the contactless charging module 1. can do.

  Next, a non-contact charger (power transmission side) and a portable terminal (power reception side) which are non-contact charging devices provided with the non-contact charging module 1 of the present invention will be described.

  FIG. 5 is a block diagram showing a non-contact power transmission device according to the embodiment of the present invention.

  The non-contact power transmission device includes a primary-side non-contact charging module 41 (transmitting-side non-contact charging module) and a secondary-side non-contact charging module 42 (receiving-side non-contact charging module) which are the non-contact charging module 1. Then, electric power is transmitted from the primary side non-contact charging module 41 to the secondary side non-contact charging module 42 using the electromagnetic induction action. This non-contact power transmission device is used for power transmission of about 5 W or less. The frequency of power transmission is about 110 to 205 kHz. The primary side non-contact charging module 41 is mounted on, for example, a charger, and the secondary side non-contact charging module 42 is mounted on, for example, a mobile phone, a digital camera, a PC, or the like.

  The primary side non-contact charging module 41 includes a primary side coil 21a, a primary side magnetic sheet 3a, a resonance capacitor (not shown), and a power input unit 71. The power input unit 71 is connected to a commercial power supply 300 as an external power supply, receives a power supply of about 100 to 240 V, converts it into a predetermined current (DC 12 V, 1 A), and supplies it to the primary coil 21 a. The primary coil 21a generates a magnetic field according to its shape, number of turns, and supplied current. The resonance capacitor is connected to the primary side coil 21a and determines the resonance frequency of the magnetic field generated from the primary side coil 21a according to the relationship with the primary side coil 21a. The electromagnetic induction action from the primary side non-contact charging module 41 to the secondary side non-contact charging module 42 is performed by this resonance frequency.

  On the other hand, the secondary side non-contact charging module 42 includes a secondary side coil 21b, a secondary side magnetic sheet 3b, a resonance capacitor (not shown), a rectifier circuit 72, and a power output unit 82. The secondary side coil 21b receives the magnetic field generated from the primary side coil 21a, converts the magnetic field into a predetermined current 2 by electromagnetic induction, and passes the secondary side through the rectifier circuit 72 and the power output unit 82. Output to the outside of the non-contact charging module 42. The rectifier circuit 72 rectifies a predetermined current that is an alternating current and converts it into a predetermined current that is a direct current (DC 5 V, 1.5 A). The power output unit 82 is an external output unit of the secondary side non-contact charging module 42, and power is supplied to the electronic device 200 connected to the secondary side non-contact charging module 42 via the power output unit 82. Do.

  Next, the case where the primary side non-contact charging module 41 is mounted on a non-contact charger will be described.

  FIG. 6 is a diagram showing the configuration of the non-contact charger in the embodiment of the present invention. In addition, the non-contact charger shown in FIG. 6 is shown so that the inside can be understood.

  A non-contact charger 400 that transmits electric power using electromagnetic induction has a primary-side non-contact charging module 41 inside a case that constitutes its exterior.

  The non-contact charger 400 has a plug 401 that is plugged into an outlet 301 of a commercial power supply 300 installed indoors or outdoors. By inserting the plug 401 into the outlet 301, the non-contact charger 400 can be supplied with power from the commercial power source 300.

  The non-contact charger 400 is installed on the desk 501, and the primary-side non-contact charging module 41 is disposed in the vicinity of the surface 402 opposite to the desk surface side of the non-contact charger 400. And the main plane of the primary side coil 21a in the primary side non-contact charge module 41 is arrange | positioned in parallel with the surface 402 on the opposite side to the desk surface side of the non-contact charger 400. FIG. By doing in this way, the electric power reception work area of the electronic device carrying the secondary side non-contact charge module 42 is securable. The non-contact charger 400 may be installed on a wall surface. In this case, the non-contact charger 400 is disposed in the vicinity of the surface opposite to the wall surface side. The primary side coil 21a is arranged on the main plane side (the side opposite to the desk surface side or the wall surface side) from the primary side magnetic sheet 51.

  FIG. 7 is a diagram showing the configuration of the mobile terminal device in the embodiment of the present invention, and is a perspective view when the mobile terminal device is disassembled. At this time, the secondary coil 21b is visible on the upper side in the drawing than the secondary magnetic sheet 3b, but is simply illustrated. Originally, the secondary magnetic sheet 3b is disposed on the substrate 523 side, and the secondary coil 21b is disposed on the housing 526 side.

  The portable terminal device 520 includes a liquid crystal panel 521 that is a display unit, operation buttons 522, a substrate 523, a battery pack 524, and the like. A mobile terminal device 520 that receives power using electromagnetic induction is a mobile terminal device that includes a casing 525 that forms the exterior thereof and a secondary non-contact charging module 42 inside the casing 526. When the display unit is a touch panel system, it can also serve as an operation button.

  Control for receiving the information input from the operation button 522 and displaying necessary information on the liquid crystal panel 521 to control the mobile terminal device 520 on the back surface of the housing 525 provided with the liquid crystal panel 521 and the operation button 522. A substrate 523 having a portion is provided. A battery pack 524 is provided on the back surface of the substrate 523. The battery pack 524 is connected to the substrate 523 and supplies power to the substrate 523.

  Further, a secondary-side non-contact charging module 42 is provided on the back surface of the battery pack 524, that is, on the housing 526 side. The secondary side non-contact charging module 42 is supplied with electric power from the primary side non-contact charging module 41 by electromagnetic induction action, and charges the battery pack 524 using the electric power. The secondary-side non-contact charging module 42 is not limited to the back surface of the battery pack 524, and may be disposed on the back surface (the housing 526 side) of the substrate 523. Further, a part of the substrate 523 is not necessarily stacked with the battery pack 524, and the substrate 523 and the battery pack may be arranged side by side.

  The secondary side non-contact charging module 42 includes a secondary side coil 21b, a magnetic sheet 3b, and the like. When the direction of receiving power supply is the case 526 side, the secondary coil 21b and the magnetic sheet 3b are arranged in this order from the case 526 side, so that the influence of the substrate 523 and the battery pack 524 is reduced and the power supply is received. Can do.

  According to the non-contact charging module of the present invention, since the non-contact charging module can be thinned in a state in which the cross-sectional area of the planar coil portion is sufficiently secured, a portable terminal such as a mobile phone or a portable computer, It is useful as a non-contact charging module for various electronic devices such as portable devices such as video cameras.

DESCRIPTION OF SYMBOLS 1 Non-contact charge module 2 Planar coil part 21 Coil 22,23 Terminal 3 Magnetic sheet 31 Flat part 32 Center part 33 Recessed part 34 Slit 35 Notch 36 Slit 40 Adhesive sheet 50 Protrusion

Claims (2)

Forming a plurality of cuts on the first surface of the magnetic sheet;
Firing the magnetic sheet;
Adhering a sheet for holding the magnetic sheet to each of the first surface of the magnetic sheet and a second surface opposite to the first surface;
Forming a slit for dividing the magnetic sheet at the plurality of cuts by applying pressure from the second surface side of the magnetic sheet;
A method for manufacturing a non-contact charging module, wherein a planar coil portion around which a conducting wire is wound via the sheet is bonded to the first surface side of the magnetic sheet. A planar coil;
A magnetic sheet for placing the planar coil on the first surface;
A sheet for holding the first surface of the magnetic sheet and a second surface opposite to the first surface;
The magnetic sheet has a plurality of cuts in the first surface, slits that divide the magnetic sheet into a plurality through the plurality of cuts, and a convex portion formed in the slit portion of the second surface, A non-contact charging module comprising: