JP5870254B2 - Non-contact charging module, non-contact charger using the same and portable terminal - Google Patents

Description

  The present invention relates to a non-contact charging module having a planar coil portion and a magnetic sheet, and a non-contact charging device using the same.

  In recent years, many devices that can charge the main device in a non-contact manner with a charger have been used. This is a transmitter contactless charging module on the charger side, a receiver contactless charging module on the main unit side, and electromagnetic induction is generated between the two modules to transmit power from the charger side to the main unit side. To do. It has also been proposed to apply a mobile terminal device or the like as the main device.

  The main device such as the portable terminal device and the charger are required to be thin and small. In order to meet this demand, it is conceivable to provide a planar coil portion as a transmitting-side non-contact charging module or a receiving-side non-contact charging module and a magnetic sheet as in (Patent Document 1). Also, some conventional magnetic sheets are manufactured and configured as in (Patent Document 2).

JP 2006-42519 A Japanese Patent No. 4400509

  Since this type of contactless charging module uses the electromagnetic induction phenomenon to transmit power, the coil portion of the primary side contactless charging module (transmitting side contactless charging module) and the secondary side contactless charging module (receiving) Heat generation is likely to occur in the coil portion of the side non-contact charging module. That is, it is difficult to set the transmission efficiency to 100% for various reasons such as the alignment and distance between the primary side non-contact charging module and the secondary side non-contact charging module, and the influence of surrounding metal. Further, the coil part itself includes a resistance component. For this reason, heat generation in the coil portion is an unavoidable problem.

  On the other hand, the magnetic sheet has temperature characteristics. That is, the magnetic sheet is warmed by the heat generated by the coil portion, and the characteristics of the magnetic sheet change. When the characteristic of the magnetic sheet changes, the L value of the coil portion changes, and as a result, the resonance frequency of the non-contact charging module changes. If the resonance frequency of the primary side non-contact charging module and the resonance frequency of the secondary side non-contact charging module are shifted, the power transmission efficiency may be lowered accordingly. That is, it is necessary to suppress changes in the resonance frequency of both the primary side non-contact charging module and the secondary side non-contact charging module. Furthermore, since the secondary side non-contact charging module is generally housed in a miniaturized portable terminal, the magnetic sheet is more likely to be warmed compared to the primary side non-contact charging module.

  Furthermore, since the time required for non-contact charging is generally several hours and requires a long time, the time for the heat generated in the coil portion to be transferred to the magnetic sheet also becomes longer.

Therefore, in view of the above problems, the present invention is a non-contact method capable of suppressing heat generated in the coil portion from being transferred to the magnetic sheet while maintaining high power transmission efficiency by maintaining the L value of the coil portion. It is an object to provide a charging module and a non-contact charging device using the same. It is another object of the present invention to provide a non-contact charging module and a non-contact charging device using the same, which can stabilize power transmission efficiency even when charging is performed for a long time.

  In order to solve the above problems, the present invention includes a planar coil portion around which a conducting wire is wound, and a magnetic sheet having a surface facing the planar coil portion, and the magnetic sheet includes the planar coil portion and the planar coil portion. The opposing surfaces are provided with a plurality of recesses, the bottoms of the plurality of recesses are separated from the planar coil part, and the recesses have a depth of 10% with respect to the thickness of the planar coil part. It was set as the non-contact charge module characterized by being -25%.

  According to the present invention, by maintaining the L value of the coil part and maintaining high power transmission efficiency, the contact area between the conductive wire of the coil part and the magnetic sheet is reduced, so that the heat generation of the coil part is applied to the magnetic sheet. It can be set as the non-contact charge module which can suppress heat transfer, and the non-contact charge apparatus using the same. Thereby, even if it charges for a long time, it can be set as the non-contact charge module which stabilized the power transmission efficiency highly efficiently, and the non-contact charge apparatus using the same.

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 primary side non-contact charge module in embodiment of this invention Detailed drawing which shows the primary side non-contact charge module in the form of execution of this invention The figure which shows the structure of the portable terminal device in embodiment of this invention The figure which shows the secondary side non-contact charge module in embodiment of this invention Detailed view showing a secondary side non-contact charging module in an embodiment of the present invention The conceptual diagram which shows the magnetic sheet in embodiment of this invention The figure which shows comparison with sectional drawing of the non-contact charging module in embodiment of this invention, and sectional drawing of the non-contact charging module when the recessed part is not formed in a magnetic sheet The figure which shows the temperature characteristic of the magnetic sheet in embodiment of this invention

  The invention according to claim 1 includes a planar coil portion around which a conducting wire is wound, and a magnetic sheet having a surface facing the planar coil portion, and the magnetic sheet faces the planar coil portion. The surface includes a plurality of recesses, and the bottoms of the plurality of recesses are separated from the planar coil unit, and the recesses have a depth of 10% to 25% with respect to the thickness of the planar coil unit. It is a non-contact charge module characterized by being%. Thereby, it can be set as the non-contact charge module which can suppress that the heat_generation | fever of a coil part heat-transfers to a magnetic sheet, maintaining the high electric power transmission efficiency by maintaining the L value of a coil part. Thereby, even if it charges for a long time, it can be set as the non-contact charge module which stabilized the power transmission efficiency highly efficiently.

  The invention according to claim 2 is the non-contact according to claim 1, wherein the plurality of recesses are provided in a portion of the surface facing the planar coil portion where the planar coil portion is opposed. It is a charging module. Thereby, it is considered as a non-contact charging module capable of effectively suppressing the heat generated in the coil portion from being transferred to the magnetic sheet while maintaining the high power transmission efficiency by maintaining the L value of the coil portion. Can do. Thereby, even if it charges for a long time, it can be set as the non-contact charge module which stabilized the power transmission efficiency highly efficiently.

According to a third aspect of the present invention, the maximum width of the opening surfaces of the plurality of recesses is smaller than the wire diameter of the conducting wire. It is. As a result, the distance between the bottom of the concave portion and the conductive wire is ensured, and the L value of the coil portion is reliably maintained, so that the heat generated in the coil portion is transferred to the magnetic sheet while maintaining high power transmission efficiency. It can be set as the non-contact charge module which can suppress. Thereby, even if it charges for a long time, it can be set as the non-contact charge module which stabilized the power transmission efficiency highly efficiently.

  A fourth aspect of the present invention is a non-contact charger comprising the non-contact charging module according to any one of the first to third aspects. Accordingly, the non-contact charging module capable of suppressing the heat generated in the coil portion from being transferred to the magnetic sheet while maintaining the high power transmission efficiency by maintaining the L value of the coil portion, and the non-contact using the same It can be a charger. Thereby, even if it charges for a long time, it can be set as the non-contact charging module which stabilized the power transmission efficiency highly efficiently, and the non-contact charger using the same.

  The invention according to claim 5 is a portable terminal comprising the non-contact charging module according to any one of claims 1 to 3. Accordingly, the non-contact charging module capable of suppressing the heat generated in the coil portion from being transferred to the magnetic sheet while maintaining the L value of the coil portion while maintaining high power transmission efficiency, and the portable terminal using the same It can be. Thereby, even if it charges for a long time, it can be set as the non-contact charge module which stabilized the power transmission efficiency highly efficiently, and a portable terminal using the same.

(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Non-contact charging system]
FIG. 1 is a block diagram showing a non-contact power transmission device according to an 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). Utilizing this, power is transmitted from the primary side non-contact charging module 41 to the secondary side non-contact charging module 42. 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 magnetic sheet 51, 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 power supply of about 100 to 240 V, converts it into a predetermined current 1 (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 magnetic sheet 52, 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 the predetermined current 2 which is an alternating current and converts it into a predetermined current 3 which is a direct current (DC 5V, 1.5A). In addition, 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.
[About non-contact charger and primary non-contact charging module]
Next, the case where the primary side non-contact charging module 41 is mounted on a non-contact charger will be described.

  FIG. 2 is a diagram showing a configuration of the non-contact charger in the embodiment of the present invention. In addition, the non-contact charger shown in FIG. 2 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.

  Further, the primary side non-contact charging module 41 may include a magnet 30 a used for alignment with the secondary side non-contact charging module 42. In this case, it arrange | positions in the hollow part located in the center area | region of the primary side coil 21a.

  Next, the primary side non-contact charging module 41 will be described.

  FIG. 3 is a diagram showing the primary side non-contact charging module in the embodiment of the present invention, and shows a case where the primary side coil is a circular coil. In FIG. 3, a circular coil wound in a circle is described, but a rectangular coil wound in a substantially rectangular shape may be used. In addition, about the detail of the primary side non-contact charge module demonstrated from now on, it applies to a secondary side non-contact charge module fundamentally. The difference of the secondary side non-contact charging module with respect to the primary side non-contact charging module will be described in detail later.

  The primary side non-contact charging module 41 includes a primary side coil 21a in which a conducting wire is wound in a spiral shape, and a magnetic sheet 51 provided so as to face the surface of the primary side coil 21a.

  As shown in FIG. 3, the primary coil 21a includes a primary coil 21a in which a conductor is wound in a radial direction so as to draw a vortex on the surface, and currents provided at both ends of the primary coil 21a. Terminals 22a and 23a are provided as supply units. That is, the terminals 22a and 23a serving as current supply units supply the current from the commercial power supply 300, which is an external power supply, to the primary coil 21a. The primary coil 21a is obtained by winding a conducting wire in parallel on a plane, and a surface formed by the coil is called a coil surface. The thickness direction is the direction in which the primary coil 21a and the magnetic sheet 51 are stacked.

In addition, the magnetic sheet 51 includes a flat portion 31a on which the primary coil 21a is placed and a flat portion 31.
a central portion 32a corresponding to the hollow region of the primary coil 21a and a linear recess 33a into which a part of the lead wire of the primary coil 21a is inserted. The central portion 32a has a convex shape, a flat shape, a concave shape, or a shape that is a through hole with respect to the flat portion 32a, and may be any shape. If it is a convex part shape, the magnetic flux of the primary side coil 21a can be strengthened. If it is flat, it is easy to manufacture and it is easy to place the primary coil 21a, and it is possible to balance the influence of the magnet for alignment described later and the L value of the primary coil 21a. The concave shape and the through hole will be described in detail later.

  In the primary side non-contact charging module 41 in the present embodiment, the primary side coil 21a is wound outward from an inner diameter of 20 mm in diameter, and the outer diameter is 30 mm. That is, the primary coil 21a is wound in a donut shape. The primary coil 21a may be wound in a circular shape or may be wound in a polygonal shape. That is, it may be a substantially square, a substantially rectangular shape, or just a shape thereof. In the case of a polygon, it may have rounded corners (curved portions).

  Further, 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 primary coil 21a can be kept small. Moreover, the thickness of the primary side coil 21a can be suppressed by winding so that space may be packed.

  Further, the primary side non-contact charging module 41 may include a magnet 30 a used for alignment with the secondary side non-contact charging module 42. This is defined by the standard (WPC) to be circular, the diameter is 15.5 mm or less, and the like. The magnet 30a has a coin shape and must be arranged so that the center thereof coincides with the winding center axis of the primary coil 21a. This is to reduce the influence of the magnet 30a on the primary coil 21a.

  That is, examples of the alignment method include the following methods. For example, a method of performing physical (formal) forced alignment, such as forming a protrusion on the charging surface of the charger and forming a recess on the secondary electronic device. Also, a method of performing alignment by attracting each other's magnets or one magnet and the other magnetic sheet by mounting magnets on at least one of the primary side and the secondary side. A method in which the primary side automatically moves the primary side coil to the position of the secondary side coil by detecting the position of the secondary side coil. A method that allows a portable device to be charged anywhere on the charging surface of the charger by providing the charger with a large number of coils.

As described above, there are various methods for aligning the coils of the primary side (charging side) non-contact charging module and the secondary side (charged side) non-contact charging module. It is divided into the method that does not use. And if it is a primary side (charge side) non-contact charge module, the secondary side (charged side) non-contact charge module which uses a magnet and the secondary side (charge side) non-contact charge module which does not use a magnet By being able to adapt to both, it can charge regardless of the type of a secondary side (charged side) non-contact charge module, and the convenience improves. Similarly, if it is a secondary (charged) non-contact charging module, a primary (charging) non-contact charging module using a magnet and a primary (charging) non-contact charging module using a magnet. By being able to adapt to both, it can charge irrespective of the type of a primary side (charge side) non-contact charge module, and the convenience improves. That is, in the non-contact charging module that transmits power by electromagnetic induction with the other non-contact charging module that is the counterpart of power transmission, the other non-contact charging module is provided for alignment with the other non-contact charging module. A first means for aligning using a magnet and a second means for aligning without using a magnet, both of which can be aligned with the other non-contact charging module and transmit power It is necessary to configure so as to be possible.

  When the primary-side non-contact charging module 41 includes the magnet 30a, the first method of arranging the magnet 30a is a method of arranging the magnet 30a on the upper surface of the central portion 32a of the magnetic sheet 51. Further, as a second method of arranging the magnet 30a, there is a method of arranging the magnet 30a instead of the central portion 32a of the magnetic sheet 51. In the second method, since the magnet 30a is disposed in the hollow region of the primary coil 21a, the primary non-contact charging module 41 can be reduced in size.

  Note that the magnet 30a shown in FIG. 3 is not necessary when a magnet is not used for positioning the primary side non-contact charging module 41 and the secondary side non-contact charging module 42.

  Here, the influence of the magnet on the power transmission efficiency of the contactless charging module will be described. Generally, a magnet is provided in a through-hole of a built-in coil in at least one of a primary side non-contact charging module and a secondary side non-contact charging module. Accordingly, the magnet and the magnet or the magnet and the magnetic sheet 51 can be brought as close as possible, and at the same time, the primary side and secondary side coils can be brought close to each other. The magnet is circular, and in this case, the diameter of the magnet is smaller than the inner width of the primary coil 21a. In the present embodiment, the magnet has a diameter of about 15.5 mm (about 10 mm to 20 mm) and a thickness of about 1.5 to 2 mm. Further, a neodymium magnet is used, and the strength may be about 75 mT to 150 mT. In the present embodiment, since the interval between the coil of the primary side non-contact charging module and the coil of the secondary side non-contact charging module is about 2 to 5 mm, it is possible to sufficiently align with such a magnet. .

  When a magnetic flux is generated between the primary side coil and the secondary side coil for power transmission, if a magnet exists between and around the primary side coil and the secondary side coil, the magnetic flux extends to avoid the magnet. Alternatively, the magnetic flux penetrating through the magnet becomes eddy current or heat generation in the magnet, resulting in loss. Furthermore, when the magnet is disposed in the vicinity of the magnetic sheet, the magnetic permeability of the magnetic sheet in the vicinity of the magnet is lowered. Therefore, the magnet 30a provided in the primary side non-contact charging module 41 reduces the L value of both the primary side coil 21a and the secondary side coil 21b. As a result, the transmission efficiency between the non-contact charging modules decreases.

  FIG. 4 is a detailed view showing the primary side non-contact charging module in the embodiment of the present invention. 4A is a top view of the primary-side non-contact charging module, and FIG. 4B is a cross-sectional view taken along line AA of the primary-side non-contact charging module in FIG. 4A. FIG.4 (c) is BB sectional drawing of the primary side non-contact charging module in Fig.4 (a) at the time of providing a linear recessed part. FIG.4 (d) is BB sectional drawing of the primary side non-contact charge module in Fig.4 (a) at the time of providing a slit. 4A and 4B show a case where the magnet 30a is not provided. In addition, when provided, the magnet 30a shown with the dotted line is provided.

  In order to achieve a reduction in the thickness of the non-contact charger 400 to which the primary side non-contact charging module 41 is mounted, the primary side coil 21a extends from the winding start portion located in the central region of the primary side coil 21a to the terminal 23a. Is two steps in the thickness direction, and the remaining region is one step. At this time, the upper conductor and the lower conductor are wound so as to leave a space between each other, thereby reducing the stray capacitance between the upper conductor and the lower conductor, and the alternating current of the primary coil 21a. Resistance can be kept small.

Moreover, when conducting wires are stacked and the primary side coil 21a is extended in the thickness direction of the primary side non-contact charging module 41, the number of turns of the primary side coil 21a can be increased to increase the current flowing through the primary side coil 21a. . When the conducting wires are stacked, the conducting wire located in the upper stage and the conducting wire located in the lower stage are wound so as to close each other, thereby flowing the primary side coil 21a while suppressing the thickness of the primary side coil 21a. The current can be increased.

  In the present embodiment, the primary coil 21a is formed using a conducting wire having a circular cross-sectional shape, but the conducting wire used may be a conducting wire having a square cross-sectional shape. When using a conducting wire having a circular cross-sectional shape, a gap is formed between adjacent conducting wires, so that the stray capacitance between the conducting wires is reduced, and the AC resistance of the primary coil 21a can be kept small.

  In addition, the primary side coil 21a is wound in one step rather than being wound in two steps in the thickness direction, so that the AC resistance of the primary side coil 21a is lowered, and the 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 primary coil 21a in two stages. Further, the primary side non-contact charging module 41 can be thinned by winding in one stage. In addition, when the planar coil part 2 is comprised with two conducting wires, since two conducting wires are electrically connected by solder etc. in the terminal 22a and 23a part, two conducting wires are one thick conducting wire. It may be as follows. The two conducting wires may be wound in parallel with the coil surface, or may be wound in parallel with the coil surface. That is, in the case of being parallel to the coil surface, the two conducting wires are planar and are wound around the same center, and one conducting wire is sandwiched between the other conducting wires in the radial direction. Thus, even if it is the same cross-sectional area, thickness can be restrained by electrically joining two conducting wires in terminal 22a and 23a part, and making it function like one conducting wire. That is, for example, the cross-sectional area of a conducting wire having a diameter of 0.25 mm can be obtained by preparing two conducting wires having a diameter of 0.18 mm. Therefore, if the diameter of one conducting wire is 0.25 mm, the thickness of one turn of the coil 21 is 0.25 mm, the radial width of the coil 21 is 0.25 mm, but the conducting wire 2 having a diameter of 0.18 mm. In the case of a book, the thickness of one turn of the coil 21 is 0.18 mm, and the width in the radial direction is 0.36 mm. The thickness direction is the direction in which the planar coil portion 2 and the magnetic sheet 51 are laminated. Further, the coil 21 may be overlapped in two steps in the thickness direction only in a part on the center side, and the remaining outer portion may be one step. Further, in the case of being perpendicular to the coil surface, the thickness of the non-contact charging module increases, but the current flowing through the planar coil portion 2 can be increased by effectively increasing the cross-sectional area of the conducting wire, and a sufficient number of turns Can be easily secured. In the present embodiment, the primary side coil 21a is constituted by a conducting wire of about 0.18 to 0.35 mm, and among these, the primary side coil 21a of the primary side non-contact charging module 41 has a value of 0. A conducting wire of 25-0.35 mm is preferred.

  In addition, since the alternating current resistance of the primary side coil 21a is low, the loss in the primary side coil 21a is prevented, and by improving the L value, the power transmission efficiency of the primary side non-contact charging module 41 depending on the L value is improved. Can be improved.

  Moreover, in this Embodiment, the primary side coil 21a is formed in cyclic | annular form (circle shape). The shape of the primary coil 21a is not limited to an annular shape (circular shape), and may be an elliptical shape, a rectangular shape, or a polygonal shape. Considering the alignment of the primary side non-contact charging module 41 and the secondary side non-contact charging module 42, the shape of the primary side coil 21a is preferably annular (circular). This is because when the shape of the primary side coil 21a is annular (circular), power can be transmitted and received in a wider range, and therefore the primary side coil 21a and the secondary side non-contact of the primary side non-contact charging module 41 are possible. Positioning of the secondary coil 21b of the contact charging module 42 is facilitated. That is, in order to enable transmission / reception of power in a wider range, the secondary side non-contact charging module 42 is less susceptible to the angle with respect to the primary side non-contact charging module 41.

The terminals 22a and 23a may be close to each other or may be arranged apart from each other, but the primary side non-contact charging module 41 is easier to mount if they are arranged apart.

  The magnetic sheet 51 is provided in order to improve the power transmission efficiency of non-contact charging using electromagnetic induction, and includes a flat portion 31a and a central portion 32a that is the center and corresponds to the inner diameter of the coil 21. And a linear recess 33a. When the magnet 30a for positioning the primary side non-contact charging module 41 and the secondary side non-contact charging module 42 is provided, the magnet 30a may be disposed above the center portion 32a, or the magnet 30a may be positioned at the center portion. You may arrange | position instead of 32a.

  As the magnetic sheet 51, a Ni—Zn ferrite sheet, a Mn—Zn ferrite sheet, a Mg—Zn ferrite sheet, or the like can be used. The magnetic sheet 51 may have a single layer configuration, a configuration in which a plurality of the same materials are stacked in the thickness direction, or a plurality of different magnetic sheets may be stacked in the thickness direction. It is preferable that at least the magnetic permeability is 250 or more and the saturation magnetic flux density is 350 mT or more.

  An amorphous metal can also be used as the magnetic sheet 51. When a ferrite sheet is used as the magnetic sheet 51, it is advantageous in that the AC resistance of the primary coil 21a is reduced. When an amorphous metal is used as the magnetic sheet, the primary coil 21a can be made thin.

  The magnetic sheet 51 used for the primary-side non-contact charging module 41 has a size that fits within about 50 × 50 mm and has a thickness of about 3 mm or less. In the present embodiment, the magnetic sheet 51 is approximately 33 mm × 33 mm having a substantially square shape. It is desirable that the magnetic sheet 51 be formed to be approximately the same or larger than the outer peripheral end of the primary coil 21a. Moreover, the shape of the magnetic sheet 51 may be a circle, a rectangle, a polygon, a rectangle having a large curve at each corner, or a polygon.

The linear recess 33a or the slit 34a accommodates the lead wire from the coil winding start portion (the innermost portion of the coil) to the terminal. Thereby, it can prevent that the conducting wire from the winding start part of a coil to a terminal overlaps in the thickness direction of the primary side coil 21a, and can suppress the thickness of the primary side non-contact charge module 41. Further, by setting the size of the linear recess 33a or the slit 34a to the minimum size for accommodating the conductive wire from the coil winding start portion to the terminal, the generation of leakage magnetic flux can be suppressed. Further, the cross-sectional shape of the linear recess 33a is not limited to a rectangular shape, and may be an arc shape or rounded.

The linear recess 33a or the slit 34a is formed so as to be substantially perpendicular to the end of the magnetic sheet 51 where one end of the slit 34a intersects, and to overlap the outer shape of the center 32a (on the tangential line for a circular coil or on the side for a rectangular coil). Is done. Thus, by forming the linear recess 33a or the slit 34a, the terminals 22a and 23a can be formed without bending the winding start of the conducting wire. The length of the linear recess 33a or the slit 34a depends on the inner diameter of the coil 21, and is about 15 mm to 20 mm in the present embodiment.

  Moreover, you may form the linear recessed part 33a or the slit 34a in the part which the outer periphery of the edge part of the magnetic sheet 51 and the center part 32a approaches most. Thereby, the formation area of the linear recessed part 33a or the slit 34a can be suppressed to the minimum, and the transmission efficiency of a non-contact electric power transmission apparatus can be improved. In this case, the length of the linear recess 33a or the slit 34a is about 5 mm to 10 mm. In either arrangement, the inner end of the linear recess 33a or the slit 34a is connected to the center 32a.

Further, the linear recess 33a or the slit 34a may be arranged in another manner. That is, 1
It is desirable that the secondary coil 21a has a single-stage structure as much as possible. In that case, all the turns in the radial direction of the primary-side coil 21a have a single-stage structure, or one part has a single-stage structure and the other part has two stages. A step structure may be considered. Accordingly, one of the terminals 22a and 23a can be pulled out from the outer periphery of the primary coil 21a, but the other must be pulled out from the inside. When the portion around which the primary coil 21a is wound and the portion from the winding end of the primary coil 21a to the terminal 22a or 23a always overlap in the thickness direction, a linear recess 33a or slit is formed in the overlapping portion. What is necessary is just to provide 34a.

  If the linear recess 33a is used, the magnetic sheet 51 is not provided with a through hole or a slit, so that magnetic flux can be prevented from leaking and the power transmission efficiency of the primary side non-contact charging module 41 can be improved. On the other hand, in the case of the slit 34a, the magnetic sheet 51 can be easily formed. When it is the linear recessed part 33a, it is not limited to the linear recessed part 33a in which a cross-sectional shape becomes a square shape, You may be circular arc shape or round.

  Next, the influence which a magnet has on the primary side non-contact charging module 41 and a secondary side non-contact charging module 42 described later will be described. The secondary side coil 21b in the secondary side non-contact charging module 42 receives the magnetic field generated by the primary side non-contact charging module 41 and performs power transmission. Here, if magnets are arranged around the primary side coil 21a and the secondary side coil 21b, a magnetic field may be generated so as to avoid the magnets, or the magnetic field trying to pass through the magnets may be lost. In addition, the magnetic permeability of the magnetic sheet 51 near the magnet is reduced. That is, the magnetic field is weakened by the magnet. Therefore, in order to minimize the magnetic field weakened by the magnet, measures such as separating the primary side coil 21a and the secondary side coil 21b from the magnet and providing the magnetic sheet 51 which is not easily affected by the magnet are provided. It is necessary to take.

  Here, since the primary-side non-contact charging module 41 is used for a fixed terminal as a transmission side for power supply, there is room in the occupied space in the fixed terminal of the primary-side non-contact charging module 41. Moreover, since the electric current which flows into the primary side coil 21a of the primary side non-contact charge module 41 is large, the insulation of the magnetic sheet 51 becomes important. This is because if the magnetic sheet 51 is conductive, a large current flowing through the primary side coil 21 a may be transmitted to other components via the magnetic sheet 51.

  Considering the above points, the magnetic sheet 51 mounted on the primary-side non-contact charging module 41 has a thickness of 400 μm or more (preferably 600 μm to 1 mm), magnetic permeability of 250 or more, and magnetic flux saturation density of 350 mT. Ni-Zn ferrite sheets (insulating) having the above are preferable. However, by performing sufficient insulation treatment, a Mn—Zn ferrite sheet (conductive) can be used instead of the Ni—Zn ferrite sheet.

  Further, in the primary side non-contact charging module 41, the L value of the primary side coil 21a of the primary side non-contact charging module 41 varies greatly depending on whether or not the magnet 30a is used for alignment. That is, the magnetic flux between the primary side and the secondary side non-contact charging module is hindered by the presence of the same magnet in the magnet 30a or the secondary side non-contact charging module 42 in the primary side non-contact charging module 41, When there is a magnet, the L value of the primary side coil 21a of the primary side non-contact charging module 41 is significantly reduced. In order to suppress the influence of the magnet 30a, the magnetic sheet 51 is preferably a high saturation magnetic flux density material (saturation magnetic flux density is 350 mT or more). Since the high saturation magnetic flux density material does not easily saturate the magnetic flux even if the magnetic field becomes strong, it is difficult to be affected by the magnet 30a, and the L value of the coil 21 when the magnet 30a is used can be improved. Therefore, the magnetic sheet 51 can be thinned.

  However, if the magnetic permeability of the magnetic sheet 51 becomes too low, the L value of the primary side coil 21a is extremely lowered. As a result, the efficiency of the primary side non-contact charging module 41 may be reduced. Therefore, the magnetic permeability of the magnetic sheet 51 is at least 250 or more, preferably 1500 or more. In addition, the L value depends on the thickness of the magnetic sheet 51, but the thickness of the ferrite sheet 3 may be 400 μm or more. Note that the ferrite sheet can reduce the AC resistance of the coil 21 as compared to an amorphous metal magnetic sheet, but may be an amorphous metal. By using such a magnetic sheet 51, even if at least one of the primary-side non-contact charging module 41 and the secondary-side non-contact charging module 42 includes a magnet, the primary-side non-contact charging module 41 is a magnet. Can reduce the effect of.

Further, since the ferrite sheet is Mn—Zn-based, it is possible to further reduce the thickness. That is, according to the standard (WPC), the frequency of electromagnetic induction is determined to be about 100 kHz to 200 kHz (for example, 120 kHz). In such a low frequency band, the Mn—Zn ferrite sheet has high efficiency. Note that the Ni—Zn ferrite sheet is highly efficient at high frequencies.
[About mobile terminals and secondary non-contact charging modules]
Next, the case where the secondary side non-contact charging module 42 is mounted on a portable terminal device will be described.

  FIG. 5 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.

  The portable terminal 520 includes a liquid crystal panel 521, operation buttons 522, a substrate 523, a battery pack 524, and the like. A portable terminal 520 that receives electric power using electromagnetic induction is a portable terminal device that includes a casing 525 that forms the exterior thereof and a secondary non-contact charging module 42 inside the casing 526.

  Control for receiving the information input from the operation button 522 and displaying necessary information on the liquid crystal panel 521 to control the entire portable terminal 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 includes a secondary side coil 21b, a magnetic sheet 52, and the like. When the power supply direction is the case 526 side, the secondary coil 21b and the magnetic sheet 52 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.

Further, the secondary side non-contact charging module 42 may have a magnet 30 b used for alignment with the primary side non-contact charging module 41. In this case, it arrange | positions in the hollow part located in the center area | region of the secondary side coil 21b. This is defined by the standard (WPC) to be circular, the diameter is 15.5 mm or less, and the like. The magnet 30a has a coin shape and must be arranged so that the center thereof coincides with the winding center axis of the primary coil 21a. This is to reduce the influence of the magnet 30a on the primary coil 21a. The magnet 30b provided in the secondary side non-contact charging module 42 reduces the L value of both the primary side coil 21a and the secondary side coil 21b.

  When the secondary-side non-contact charging module 42 has the magnet 30b, the first method for arranging the magnet 30b is to arrange the magnet 30b on the upper surface of the central portion 32b of the magnetic sheet 52. Further, as a second method of arranging the magnet 30b, there is a method of arranging the magnet 30b instead of the central portion 32b of the magnetic sheet 52. In the second method, since the magnet 30b is disposed in the hollow region of the secondary coil 21b, the secondary non-contact charging module 42 can be reduced in size.

  In addition, when not using a magnet for position alignment of the primary side non-contact charge module 41 and the secondary side non-contact charge module 42, the magnet 30b is unnecessary.

  Next, the secondary side non-contact charging module 42 will be described.

  FIG. 6 is a diagram showing the secondary side non-contact charging module in the embodiment of the present invention, and shows a case where the secondary side coil is a circular coil.

  FIG. 7 is a detailed view showing the secondary side non-contact charging module in the embodiment of the present invention. Fig.7 (a) is a top view of a secondary side non-contact charge module, FIG.7 (b) is CC sectional drawing of the secondary side non-contact charge module in Fig.7 (a). FIG.7 (c) is DD sectional drawing of the secondary side non-contact charge module in Fig.7 (a) at the time of providing a linear recessed part. FIG.7 (d) is DD sectional drawing of the secondary side non-contact charge module in Fig.7 (a) at the time of providing a slit. 7A and 7B show a case where the magnet 30b is not provided. In addition, when provided, the magnet 30b shown with the dotted line is provided.

  6 to 7 illustrating the secondary side non-contact charging module 42 correspond to FIGS. 3 to 4 illustrating the primary side non-contact charging module 41, respectively. The configuration of the secondary side non-contact charging module 42 is substantially the same as that of the primary side non-contact charging module 41.

  The difference between the secondary side non-contact charging module 42 and the primary side non-contact charging module 41 is the size and material of the magnetic sheet 52. The magnetic sheet 52 used for the secondary-side non-contact charging module 42 has a size that fits within about 40 × 40 mm and has a thickness of about 2 mm or less.

  The sizes of the magnetic sheet 51 used for the primary side non-contact charging module 41 and the magnetic sheet 52 used for the secondary side non-contact charging module 42 are different. This is because the secondary side non-contact charging module 42 is generally mounted on a portable electronic device, and downsizing is required. In the present embodiment, the magnetic sheet 52 has a substantially square shape of about 33 mm × 33 mm. It is desirable that the magnetic sheet 52 be formed to be approximately the same or larger than the outer peripheral end of the secondary coil 21b. Moreover, the shape of the magnetic sheet 51 may be a circle, a rectangle, a polygon, a rectangle having a large curve at each corner, or a polygon.

  Moreover, since the secondary side non-contact charging module 42 is used for a portable terminal as a receiving side of power supply, there is no room in the occupied space in the portable terminal of the secondary side non-contact charging module 42. Further, since the current flowing through the secondary side coil 21b of the secondary side non-contact charging module 42 is small, the insulating property of the magnetic sheet 52 is not so required. In the present embodiment, the secondary side coil 21b is constituted by a conductive wire of about 0.18 to 0.35 mm, and among these, the secondary side coil 21b of the secondary side non-contact charging module 42 has a value of 0. A conducting wire of about 18 to 0.30 mm is suitable.

  When the electronic device to be mounted is a mobile phone, the electronic device is often disposed between a case constituting the exterior of the mobile phone and a battery pack positioned inside the case. Generally, since a battery pack is an aluminum casing, it adversely affects power transmission. This is because an eddy current is generated in aluminum in a direction in which the magnetic flux generated by the coil is weakened, so that the magnetic flux of the coil is weakened. Therefore, it is necessary to provide the magnetic sheet 52 between the aluminum that is the exterior of the battery pack and the secondary coil 21b disposed on the exterior to reduce the influence on the aluminum.

  In consideration of the above points, the magnetic sheet 52 used for the secondary side non-contact charging module 42 has a high magnetic permeability and saturation magnetic flux density, and can increase the L value of the secondary side coil 21b as much as possible. is important. Basically, any magnetic sheet having a magnetic permeability of 250 or more and a saturation magnetic flux density of 350 mT or more may be used similarly to the magnetic sheet 51. In the present embodiment, it is a sintered body of Mn—Zn-based ferrite, preferably having a magnetic permeability of 1500 or more, a saturation magnetic flux density of 400 or more, and a thickness of about 400 μm or more. However, Ni-Zn ferrite may be used, and power transmission with the primary side non-contact charging module 41 is possible if the magnetic permeability is 250 or more and the saturation magnetic flux density is 350 or more. Similarly to the primary coil 21a, the secondary coil 21b is wound in a substantially circular or rectangular shape. There are a case where positioning is performed by providing the magnet 30a in the primary side non-contact charging module 41 and a case where positioning is performed without the magnet 30a.

  Next, the relationship between the size of the magnet 30a and the size of the inner diameter of the primary coil 21a will be described. Here, although the case where the magnet 30a is arrange | positioned at the primary side non-contact charge module 41 is demonstrated, the same relationship is realized also when the magnet 30b is arrange | positioned at the secondary side non-contact charge module 42. FIG. In that case, the magnet 30b corresponds to the magnet 30a.

  Next, the magnetic sheet 51 of the primary side non-contact charging module 41 and the magnetic sheet 52 of the secondary side non-contact charging module 42 shown in FIGS.

  FIG. 8 is a conceptual diagram showing a magnetic sheet in the embodiment of the present invention. 8A is a top view of the magnetic sheet, and FIG. 8B is an EE cross-sectional view of FIG. 8A. In addition, for the sake of easy understanding, the concave portion is illustrated in an enlarged manner. Moreover, although the magnetic sheet 51 of the primary side non-contact charge module 41 is demonstrated as an example, the following description regarding the magnetic sheet 51 is applied also to the magnetic sheet 52 of the secondary side non-contact charge module 42. The size of the magnetic sheet 51 is 30 mm × 30 mm × 0.4 mm after sintering.

  A plurality of recesses 53 are formed on a plurality of straight lines on at least one surface of the magnetic sheet 51. The shape of the recess may be anything, and may be a circle, an ellipse, a polygon, or other shapes. The recess 53 in the present embodiment has a circular shape with an opening surface of 0.5 mm × 0.5 mm and a depth of 0.1 mm. Basically, the area of the opening surface may be an area corresponding to a circular area of 0.5 mm × 0.5 mm to a circular area of 1 mm × 1 mm. When it becomes larger than this, the conducting wire of the primary side coil 21 a enters the recess 53, and the distance between the primary side coil 21 a and the bottom of the recess 53 cannot be secured. In addition, although the wire diameter of a conducting wire is generally about 0.25 mm to 0.4 mm and smaller than the opening surface of the recessed portion 53, the conducting wire is wound in a planar coil shape, so that it can be easily inserted into the recessed portion 53. Do not fit. Further, if the maximum width of the opening surface of the recess 53 is configured to be smaller than the wire diameter of the primary coil 21a, the distance between the bottom of the recess 53 and the conducting wire of the primary coil 21a is surely ensured. Can do. Note that the maximum width of the opening surface of the recess 53 is, for example, 1 mm when the opening surface has an elliptical shape of 1 mm × 0.5 mm, and the recess 53 may have any shape. It means the maximum value of.

  Moreover, the depth of the recessed part 53 should just be about 0.06 mm-0.15 mm. Alternatively, it may be about 10% to 25% of the thickness of the magnetic sheet 51. The thickness of the magnetic sheet 51 is the thickness of the flat portion 31a of the magnetic sheet 51. As a result, the effect of the present invention can be maximized while maintaining the power transmission efficiency of the non-contact charging module. That is, if the recessed part 53 is too deep, the volume of the magnetic sheet 51 will decrease and the effect of improving the L value of the primary side coil 21a will decrease. However, if it is too shallow, it will be difficult to sufficiently obtain the effects of the present invention. Furthermore, the recessed part 53 is provided with two or more, and the distance between recessed parts is about 1 mm, and should just be a distance of about 0.5 mm-3 mm. That is, the area occupied by the recesses 53 with respect to the area of the surface of the magnetic sheet 51 is about 25% in the present embodiment, and may be about 10% to 35%. If it is smaller than 10%, the effect of forming the recess 53 cannot be sufficiently obtained, and if it exceeds 35%, the strength of the magnetic sheet 51 is lowered. That is, it becomes easy to break, and when the magnetic sheet 51 is broken, the characteristics of the magnetic sheet 51 change. Therefore, by being about 10% to 35%, it is possible to secure strength and obtain the maximum effect of the present invention. Further, if the magnetic sheet 51 and the primary side coil 21a are separated from each other as described above, the influence of the magnetic sheet 51 on improving the L value of the primary side coil 21a becomes weak. The lateral distance between the recesses 53 is preferably larger than the lateral width of the opening surface of the recesses in the lateral direction of the recesses 53. This is true either in the vertical direction or in any arbitrary direction. Thereby, the strength of the magnetic sheet 51 in that direction can be maintained.

  Moreover, although the arrangement | positioning of the recessed part 53 is good to arrange in a linear form like Fig.8 (a), it may arrange in random how. However, it is preferable that the distance between the respective recesses 53 is constant, and the recesses 53 are not concentrated in a part and are arranged uniformly. Further, the strength of the magnetic sheet 51 can be ensured by shifting each horizontal row little by little in the horizontal direction as shown in FIG. Furthermore, since it can be made into the almost same distance with any other recessed part 53 which adjoins, intensity | strength can be made substantially constant in any direction.

  The recess 53 is preferably provided at least in a portion where the primary coil 21a is disposed, that is, a portion where the primary coil 21a and the magnetic sheet 51 face each other. Thereby, it can prevent that the heat_generation | fever of the primary side coil 21a transfers to the magnetic sheet 51. FIG.

  FIG. 9 is a diagram showing a comparison between a cross-sectional view of the non-contact charging module according to the embodiment of the present invention and a cross-sectional view of the non-contact charging module when no recess is formed in the magnetic sheet. FIG. 9A is a cross-sectional view of the non-contact charging module when no recess is formed in the magnetic sheet for the sake of explanation. FIG.9 (b) is sectional drawing of the non-contact charge module in this Embodiment. FIG. 10 is a diagram illustrating the temperature characteristics of the magnetic sheet according to the embodiment of the present invention. FIG. 10A is a relationship between the temperature and the L value of the coil of the non-contact charging module, and FIG. And the L value reduction rate of the coil of the non-contact charging module is shown. Here, the characteristic change of the non-contact charging module due to the temperature change is basically due to the temperature characteristic of the magnetic sheet.

  As shown in FIG. 9B, the primary coil 21a is disposed on the surface side of the magnetic sheet 51 where the concave portion 53 is formed. However, the recesses 53 may be formed on both surfaces of the magnetic sheet 51. That is, in general, an electronic component may be disposed on the surface (back surface) opposite to the surface on which the primary coil 21a of the magnetic sheet 51 is disposed. Moreover, if this is the secondary side non-contact charge module 42, not only an electronic component but the battery pack 524 may be arrange | positioned at the back side. Even if it is a battery part or the battery pack 524, heat is easily generated, and the heat is transmitted to the magnetic sheets 51 and 52. Therefore, in order to suppress this heat transfer, a recess 53 may be formed on the back surface.

As described above, by disposing the primary coil 21a on the surface side of the magnetic sheet 51 where the recess 53 is formed, the heat generated by the primary coil 21a is effectively transferred to the magnetic sheet 51. Can be prevented. As a result, due to the temperature characteristics of the magnetic sheet 51 shown in FIG. 10, it is possible to suppress changes in the characteristics of the magnetic sheet 51 and maintain the power transmission efficiency between the non-contact charging modules. As shown in FIG. 10, when the magnetic sheet 51 is warmed by the heat generated by the primary coil 21a, as a result, the characteristics of the non-contact charging module appear as the L value and the L value decrease rate. The L value reduction rate is the L value of the coil of the non-contact charging module when the other non-contact charging module is provided with a magnet, and the non-contact charging module when the other non-contact charging module is not provided with a magnet. The value is smaller as the influence of the magnet is smaller. In addition, FIG. 10 is measured by leaving it to stand for at least 20 minutes after reaching the set temperature in a thermostatic bath.

  In addition, the protective sheet which protects the magnetic sheet 51 is affixed on both surfaces of the magnetic sheet 51, and thickness is 10-50 micrometers. Therefore, it is thinner than the depth of the recess 53. That is, when the depth of the recess 53 is deeper than the thickness of the holding sheet, a distance can be reliably ensured between the primary coil 21 a and the bottom of the recess 53. The protective sheet is made of a flexible material and is made of a plastic such as PET (polyethylene terephthalate). The PET-based sheet material is easy to handle and contains no environmentally hazardous substances and is an effective material for preventing environmental pollution. Further, the sheets 13a and 13b can be made of a transparent or light-shielding plastic, or a combination thereof. By doing so, it is possible to protect the magnetic member 11 and a conductive member (described later) formed on the magnetic member 11 from ultraviolet rays and the like, and improve long-term reliability.

  Next, the manufacturing method of the magnetic sheets 51 and 52 of this Embodiment is demonstrated. As described above, the magnetic sheets 51 and 52 are basically manufactured by a manufacturing method such as (Patent Document 2), but the magnetic sheets 51 and 52 of the present embodiment form the recesses 53.

  The magnetic member is made of ferrite or the like. Examples of the ferrite include Ni-Zn (nickel-zinc) ferrite and Mn-Zn (manganese-zinc) ferrite. For example, 48.5 mol% Fe2O3, 20.55 mol% ZnO, 20.55 mol% NiO, and 10.40 mol% CuO are blended at a composition ratio and fired at 750 ° C to 900 ° C for 4 hours. As the dielectric, for example, Ti (titanium) oxide is used.

  First, 3000 g of the ceramic magnetic calcined powder having the composition ratio described above, 135 g of Metrols as a water-soluble binder, 270 g of ceramisole as an oily plastic material, and 340 g of distilled water are mixed for 20 minutes by a mixer. Next, three rolls are passed three times to generate a soil. After this aging is preserved at 5 ° C. for 96 hours, a green sheet is produced using a vacuum extrusion molding apparatus.

  The surface of the green sheet is passed through a drum dryer at 95 ° C. to be dried and cut into a predetermined size to produce a green sheet. The produced green sheet was fired at 900 ° C. for 3 hours to produce a fired body.

  In order to form the concave portion 53, a green sheet is prepared so that the concave portion is formed when the green sheet is molded, or the green sheet is molded into a sheet shape, and then the convex mold is pressed against the green sheet. 53 may be formed. By sintering, the size of the magnetic sheet 51 and the size of the recess 53 are reduced to about 80%. Therefore, in order to form the recess 53 having the above-described size, it is necessary to form a recess having a width and a depth of about 1.25 times in the green sheet.

As described above, as a method of forming the concave portion 53, a convex mold for forming the concave portion 53 may be pressed against a flat sheet before firing. As a result, the density of the magnetic material is improved and the crystallinity is improved only by pressing around the recess 53. That is, since the characteristics of the magnetic sheet 51 are improved by the increase in the density of the magnetic material, the power transmission efficiency between the non-contact charging modules is improved. Or you may form the magnetic material before baking in the sheet form provided with the recessed part. In this case, unlike the above method, since the magnetic material is not biased, stable characteristics can be obtained regardless of the location of the magnetic sheet 51.

  Moreover, you may provide multiple slits which give the softness | flexibility to the magnetic sheet 51 like (patent document 2). The distance between the slits having flexibility is preferably about 1 to 3 times the distance between the recesses 53. Thereby, the recessed part 53 can be arrange | positioned with sufficient balance, ensuring the softness | flexibility of the magnetic sheet 51. FIG. Furthermore, even if the slits and the recesses 53 are provided, it is possible to obtain the characteristics of the magnetic sheet 51 that can obtain sufficient power transmission efficiency between the non-contact charging modules.

  According to the non-contact charging module and the non-contact charging device using the same according to the present invention, the non-contact charging module that stably stabilizes the power transmission efficiency even after long-time charging, and the non-contact charging device using the same Therefore, it is useful when charging portable devices such as mobile phones, portable audio devices, portable computers such as digital cameras, and video cameras.

DESCRIPTION OF SYMBOLS 1 Non-contact charge module 2 Planar coil part 21 Coil 21a Primary side coil 21b Secondary side coil 211, 212 Inner part 22a, 23a Terminal (primary side)
22b, 23b terminal (secondary side)
30a Magnet (primary side)
30b Magnet (secondary side)
31a Flat part (primary side)
31b Flat part (secondary side)
32a Center (primary side)
32b Center part (secondary side)
33a Straight recess (primary side)
33b Straight recess (secondary side)
34a Slit (primary side)
34b Slit (secondary side)
41 Primary side non-contact charging module (transmission side non-contact charging module)
42 Secondary side non-contact charging module (receiving side non-contact charging module)
51 Magnetic sheet (primary side)
52 Magnetic sheet (secondary side)
DESCRIPTION OF SYMBOLS 71 Power input part 72 Rectifier circuit 82 Power output part 200 Electronic device 300 Commercial power supply 301 Outlet 400 Non-contact charger 401 Plug 402 Surface 501 Desktop 520 Portable terminal 521 Liquid crystal panel 522 Operation button 523 Board | substrate 524 Battery pack (electric power holding part)
525, 526 housing

Claims (5)

A planar coil portion wound with a conducting wire;
A magnetic sheet provided with a surface facing the planar coil portion,
The magnetic sheet includes a plurality of concave portions on a surface facing the planar coil portion, the bottom portions of the concave portions and the planar coil portion are separated from each other, and the plurality of concave portions correspond to the thickness of the magnetic sheet. The non-contact charging module is characterized in that the depth of the recess is 10% to 25%. 2. The contactless charging module according to claim 1, wherein the plurality of recesses are provided in a portion facing the planar coil portion on a surface facing the planar coil portion. The non-contact charging module according to claim 1, wherein a maximum width of the opening surfaces of the plurality of recesses is smaller than a wire diameter of the conducting wire. A non-contact charger comprising the non-contact charging module according to claim 1. A portable terminal comprising the non-contact charging module according to claim 1.

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