JP5266665B2 - Electronic equipment, charger and charging system - Google Patents

Description

  The present invention relates to an electronic device, a charger, and a charging system related to contactless power transmission using a coil.

  Contactless power transmission is known that uses electromagnetic induction to enable power transmission even without a metal part contact. As an application example of this non-contact power transmission, charging of a mobile phone or charging of household equipment (for example, a handset of a telephone) has been proposed.

There has been proposed a technique for performing this contactless power transmission between a planar air-core coil of a charger and a planar air-core coil of an electronic device. In this technique, how to allow relative displacement between the planar air-core coil of the charger and the planar air-core coil of the electronic device is an important problem. That is, if the coils are not arranged at appropriate positions, the transmission efficiency is lowered, so how to allow the influence of the positional deviation between the coils is an important matter. There is a technique described in Patent Document 1 as a technique for eliminating the influence even when a positional deviation occurs between coils. Patent Document 1 discloses that, among primary and secondary air-core coils, one inner diameter is 1 mm or more larger than the other inner diameter, and further, the ratio of the inner diameter / outer diameter of each of the primary and secondary air-core coils. Is set to 0.3 to 0.7, and further, the ratio of primary air core coil outer diameter / secondary air core coil outer diameter is set to 0.7 to 1.3 and the positional deviation is set. A technique for allowing the above is disclosed.
WO99 / 27603

  An object of some aspects according to the present invention is to provide an electronic device, a charger, and a charging system that can further increase transmission efficiency.

An electronic device according to an aspect of the present invention is an electronic device that is charged according to power transmission based on electromagnetic induction by a charger including a primary air-core coil having an outer diameter of D1 and an air-core portion of d1. ,
A secondary air-core coil having an outer diameter of D2 (D2 <D1) and an air-core portion having a diameter of d2 (d2>d1);
The secondary air-core coil satisfies d2-d1 ≧ D1-D2 (1).

  According to the present invention, even if the center of the secondary air-core coil on the electronic device side deviates from the center of the primary air-core coil on the charger side, the inner diameter difference between the primary and secondary air-core coils is The air core part of the secondary air core coil on the electronic device side is the largest area (that is, the air core part of the primary air core coil) because the air core part of the secondary air core coil on the electronic device side is equal to or larger than the diameter difference. The secondary air-core coil having a small outer diameter can be maintained in a state of being completely overlapped with the primary air-core coil having a large outer diameter. Therefore, the power transmission efficiency from the charger to the electronic device can be increased.

  In one aspect of the present invention, when the positional deviation tolerance of the center of the secondary air-core coil with respect to the center of the primary air-core coil is G in the standard, G ≦ (D1-D2) / 2 Formula (2 ) Can be satisfied.

  As long as G ≦ (D1-D2) / 2 is satisfied, assuming d2-d1 ≧ D1-D2, G ≦ (D1-D2) / 2 ≦ (d2-d1) / 2 holds, and G ≦ ( It is clear that d2-d1) / 2 ... Formula (3) is also satisfied. Therefore, when the allowable displacement of the center of the secondary air-core coil relative to the center of the primary air-core coil is G in the standard, the air-core portion of the secondary air-core coil on the electronic device side is the secondary side on the charger side. The air core portion of the air core coil overlaps with the maximum area (that is, the area of the air core portion of the primary air core coil), and the secondary air core coil with a small outer diameter is a primary air core coil with a large outer diameter. It can maintain a completely overlapping state. For this reason, the power transmission efficiency from a charger to an electronic device can be improved.

Another aspect of the present invention is an electronic device that is charged according to power transmission based on electromagnetic induction by a charger including a primary air-core coil having an outer diameter D1 and an air-core portion diameter d1.
A secondary air-core coil having an outer diameter of D2 (D2 <D1) and an air-core portion having a diameter of d2 (d2>d1);
When the allowable displacement of the center of the secondary air-core coil with respect to the center of the primary air-core coil is G in the standard, D1 ≧ D2 + G × 2 (4) and d2 ≧ d1 + G × 2 (4) 5) is satisfied.

  Equation (4) is obtained by modifying Equation (2) described above, and Equation (5) is obtained by modifying Equation (3) described above. Therefore, instead of the formulas (1) and (2) according to one embodiment of the present invention described above, the air core portion of the secondary air core coil on the electronic device side can be used even when the formulas (4) and (5) are established. The secondary air-core coil of the secondary air-core coil on the charger side overlaps with the maximum area (that is, the area of the air-core part of the primary air-core coil), and the secondary air-core coil with a small outer diameter A state where it completely overlaps with the large primary air-core coil can be maintained. Therefore, the power transmission efficiency from the charger to the electronic device can be increased.

  In one aspect and another aspect of the present invention, the secondary air-core coil has a magnetic member provided on a non-transmission surface opposite to a transmission surface on the side receiving power transmission from the primary air-core coil. be able to. In this case, the magnetic member may be concentric with the center of the secondary air-core coil and be equal to or larger than the area of a circle with an outer diameter H2 that satisfies H2 ≧ D1 + G × 2 (6).

  In this way, when the positional deviation allowable amount of the center of the secondary air-core coil with respect to the center of the primary air-core coil is G in the standard, the magnetic member of the electronic device covers the primary air-core coil of the charger, The leakage magnetic field on the electronic device side can be suppressed and the transmission efficiency can be improved.

  In one aspect and another aspect of the present invention, a metal that is provided on one surface of the magnetic member that is opposite to the surface on which the secondary air-core coil is provided, and that is to be protected from leakage magnetic flux. The magnetic member may further include a protected member that is an electronic component or a circuit board, and the magnetic member may have a larger shape than the protected member and cover a side portion of the protected member. Alternatively, the magnetic member may have a shape larger than that of the secondary air-core coil and may be formed so as to cover a side portion of the secondary air-core coil.

  The electronic device on which the secondary air-core coil is mounted is required to be miniaturized, and a metal, electronic component, or surface on one surface of the magnetic member opposite to the surface on which the secondary air-core coil is provided. In many cases, a circuit board or the like must be arranged. When the magnetic member is arranged as described above, it is possible to prevent the metal member from causing an eddy current to increase its temperature, or to suppress the influence of noise on the electronic component or circuit board that is also grounded on the back side. it can.

  In one aspect and another aspect of the present invention, a shield member that shields leakage magnetic flux from the magnetic member is further provided on a side opposite to the side where the magnetic member faces the secondary air-core coil. Also good. If it carries out like this, even if magnetic flux leaks from a magnetic member, the leakage magnetic flux can be shielded with a shielding member. Thereby, to-be-protected members, such as a metal member and a circuit board installed in the back surface of an electronic device, can be protected from leakage magnetic flux.

  In one aspect and another aspect of the present invention, the printed wiring is formed thinner than the secondary air-core coil and printed with a first pattern for pulling out an inner end of the secondary air-core coil. The substrate may further include a substrate, and an inner end of the secondary air-core coil may be connected to the first pattern of the printed circuit board in the air-core portion of the secondary air-core coil.

  Electronic devices on which secondary air-core coils are mounted are required to be downsized. In order to connect the inner end of the secondary air-core coil to the substrate, when the inner end is pulled out via one surface of the secondary air-core coil, the coil unit is thickened by the thickness of the coil wire. The thickness will increase. Therefore, instead of pulling out the inner end of the secondary air-core coil, the first pattern of the printed circuit board (for example, flexible printed circuit board) thinner than the secondary air-core coil is connected to the inner end of the secondary air-core coil. ing. If the connection position of the inner end is in the air core portion of the secondary air core coil, the thickness of the wire of the coil for pulling out the inner end is not reflected in the thickness of the coil unit.

  The printed circuit board may be provided with a second pattern connected to the outer end of the coil.

  The invention according to one embodiment and another embodiment of the present invention described above may be defined as a charger instead of the electronic device side.

For example, in still another aspect of the present invention, a charger for charging an electronic device including a secondary air-core coil by electromagnetic induction,
Including a primary air-core coil having an outer diameter D1 and an air-core portion diameter d1;
When the outer diameter of the secondary air-core coil is D2 and the diameter of the air-core portion is d2, the primary air-core coil satisfies D1> D2, d1 <d2, and d2-d1 ≧ D1-D2. It is characterized by satisfying.

  Also in the charger according to still another aspect of the present invention, when a positional deviation allowable amount of the center of the secondary air-core coil with respect to the center of the primary air-core coil is G on the standard, G ≦ (d2-d1 ) / 2.

  The above charger satisfies D1 ≧ D2 + G × 2 and d2 ≧ d1 + G × 2, where G is a standard deviation tolerance of the center of the secondary air-core coil with respect to the center of the primary air-core coil. Can also be defined.

  In the primary coil unit, the influence of the secondary coil unit is small from the viewpoint of protecting the protected member. Therefore, the primary side magnetic member may be concentric with the primary air-core coil and not less than the area of a circle with a diameter H1 satisfying H1> D1 without considering the standard deviation allowable amount G.

  A charging system according to still another aspect of the present invention can be defined including the electronic device described above and a charger that charges the electronic device.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are indispensable as means for solving the present invention. Not necessarily.

1. Charging System FIG. 1 is a diagram schematically showing a charging system 100 including a charger 10 and an electronic device such as a mobile phone 20 in the charger 10. Charging from the charger 10 to the mobile phone 20 is performed between the primary air-core coil of the coil unit 12 of the charger 10 and the secondary air-core coil of the coil unit 22 of the mobile phone 20 placed horizontally on the charger 10. It is performed by non-contact power transmission using the electromagnetic induction effect generated between them.

  Here, in this embodiment, there is no means for positioning the mobile phone 20 on the charger 10.

2. Coil Unit FIGS. 2 and 3 are perspective views schematically showing the coil unit. As shown in FIG. 2, the coil unit (hereinafter referred to as “primary side coil unit”) 12 of the charger 10 and the coil unit (hereinafter referred to as “secondary side coil unit”) 22 of the electronic device 20 are basically the same. Although it can be set as a structure, as shown in FIG. 3, the primary side and secondary side coil units 12 and 22 differ in size, respectively.

  The primary coil unit 12 includes a planar air-core coil 14 and a magnetic member 16. The planar air-core coil 14 has an air-core portion 14a in the center, and an inner end coil wire 14b located inside the coil is drawn outwardly following the surface of the planar air-core coil 14, and is located outside. The outer end coil wire 14c to be drawn is also drawn outward.

  The secondary coil unit 22 includes a planar air-core coil 24 and a magnetic member 26. Similarly, the secondary planar air-core coil 24 has an air-core portion 24a in the center, and the inner end coil wire 24b located inside the coil follows the surface of the planar air-core coil 24 outward. The outer end coil wire 24c that is pulled out and located outside is also pulled out outward.

  Here, in FIG. 3, the facing surface side when the coil units 12 and 22 face each other and perform contactless power transmission is referred to as a transmission surface. The primary coil unit 12 in FIG. 1 has a transmission surface on the upper surface of the planar air-core coil 14 and a magnetic member 16 on the non-transmission surface side on the lower side. On the other hand, the secondary coil unit 22 has a transmission surface on the lower surface of the planar air-core coil 24 and a magnetic member 26 on the upper non-transmission surface. That is, both the primary side and secondary side coil units 12 and 22 have the planar air-core coils 14 and 24 arranged on opposite surfaces (transmission surfaces), and the magnetic members 16 and 26 on the non-transmission surface side.

  Hereinafter, the planar air-core coil 14 and the magnetic member 16 of the primary-side coil unit 12 are referred to as “primary air-core coil 14” and “primary-side magnetic member 16”, respectively. The planar air-core coil 24 and the magnetic member 26 of the secondary-side coil unit 22 are also referred to as “secondary air-core coil 24” and “secondary-side magnetic member 26”, respectively.

  The primary air-core coil 14 of the primary side coil unit 12 is not particularly limited as long as it is a planar coil having an air-core portion 14a. For example, a single-core or multi-core coated coil wire is spirally wound on a plane. A turned air-core coil can be applied. Alternatively, the primary air-core coil 14 may be one in which a thin film pattern is formed in a spiral shape on an insulating substrate, and the center is the air-core part, unlike FIG. The secondary air core coil 24 of the secondary side coil unit 22 can also have the same configuration as the primary air core coil 14 of the primary side coil unit 12.

  The magnetic member 16 of the primary coil unit 12 functions to receive magnetic flux from the primary air-core coil 14 and has a function of increasing the inductance of the primary air-core coil 14. The material of the magnetic member 16 is preferably a soft magnetic material, and a ferrite soft magnetic material or a metal soft magnetic material can be applied. The magnetic member 14 may be formed by adhering a magnetic material to resin, or by mixing magnetic powder with resin. The magnetic member 26 of the secondary coil unit 22 can also have the same configuration as the magnetic member 16 of the primary coil unit 12.

In the present embodiment, the relationship between the primary air-core coil 14 and the secondary air-core coil 24 will be described with reference to FIGS. The primary air-core coil 14 and the secondary air-core coil 24 have the following relationship when the dimensional symbols shown in FIGS.
d2-d1 ≧ D1-D2 (1)
d1: Diameter of the air core part of the primary air core coil d2: Diameter of the air core part of the secondary air core coil (d2> d1)
D1: Outer diameter of primary air-core coil D2: Outer diameter of secondary air-core coil (D1> D2)
This equation (1) defines that the inner diameter difference d2-d1 is equal to or larger than the outer diameter difference D1-D2 on the premise of d2> d1, D1> D2. The diameter d1 of the air-core part 14a of the primary air-core coil 14 is smaller than the diameter d2 of the air-core part of the secondary air-core coil 24, thereby increasing the magnetic line density from the primary air-core coil 14 at the air-core part 14a. It can be secured. The outer diameter D1 of the primary air-core coil 14 is larger than the outer diameter D2 of the secondary air-core coil 24, and the diameter d2 of the air-core portion 24a of the secondary air-core coil 24 is set to the air-core portion of the primary air-core coil 14. It is larger than the diameter d1 of 14a. This is because even if the center of the secondary air coil 24 is displaced with respect to the center of the primary air core coil 14, the small air core portion 14 a of the primary air core coil 14 is larger than the secondary air core coil 24. This is because it is easy to ensure that the secondary air-core coil 14 that completely overlaps with the air-core portion 24a and has a small outer diameter D2 overlaps within the range of the outer diameter of the primary air-core coil 24 with a large outer diameter D1.

  The meaning of the above equation (1) will be described with reference to FIGS. In FIG. 4, the center P1 of the primary air-core coil 14 and the center P2 of the secondary air-core coil 24 coincide. From this state, it is assumed that the secondary air-core coil 24 of FIG. 4 is moved in the direction of the arrow A and the centers P1 and P2 are displaced.

  FIG. 5 shows that the center P2 of the secondary air-core coil 24 is shifted by a distance G from the center P1 of the primary air-core coil 14, and the outer edges of the primary and secondary air-core coils 14 and 24 and the air-core portions 14a and 24a are defined. The state where the inner edge touched is shown. When the distance G at this time is (d2−d1) / 2 which is a half value of the inner diameter difference and (D1−D2) / 2 which is a half value of the outer diameter difference shown in FIG. 4, G = (d2−d1) / 2 and G = (D1−D2) / 2 is clear from the comparison between FIG. 4 and FIG.

  That is, FIGS. 4 and 5 show the respective diameters d1, d2, D1, and D2 that are critical values when the equal sign of d2−d1 = D1−D2 (= 2 × G) is established in the inequality (1). The primary and secondary air-core coils 14 and 24 are shown.

  As long as the formula (1) is satisfied, the secondary air-core coil having a small outer diameter D2 is used as long as the small air-core portion 14a of the primary air-core coil 14 completely overlaps the large air-core portion 24a of the secondary air-core coil 24. 14 overlap within the range of the outer diameter of the primary air-core coil 24 having a large outer diameter D1.

  Accordingly, FIG. 5 shows a state in which the center P2 of the air core portion 24a of the secondary air core coil 24 is shifted by the standard deviation allowable amount G from the center P1 of the air core portion 14a of the primary air core coil 14. Is shown. According to the standard, it is prohibited to use the secondary air-core coil 24 by being shifted from the center P1 of the primary air-core coil 14 beyond the allowable deviation G.

In this sense, the standard deviation tolerance G is
G ≦ (D1-D2) / 2 Formula (2)
G ≦ (d2-d1) / 2 Formula (3)
Should be.

  However, if d2-d1 ≧ D1-D2 that is the expression (1) is satisfied, G ≦ (D1-D2) / 2 as long as G ≦ (D1-D2) / 2 that is the expression (2) is satisfied. ≦ (d2−d1) / 2 is established, and G ≦ (d2−d1) / 2, which is the expression (3), is always satisfied.

  Therefore, the deviation allowance G on the standard only needs to satisfy the equation (2) under the equation (1).

  When the expressions (1) and (2) are expressed from different viewpoints, the center deviation is allowed in a range where the air core portions 14a and 24a of the primary and secondary air core coils 14 and 24 are completely overlapped with each other. In the range, it means that the entire secondary air-core coil 24 always overlaps the primary air-core coil 14 in plan view.

  As a technical significance of the expression (1), the overlapping area between the air core portions 14a and 24a of the primary and secondary air core coils 14 and 24 is always maximized (that is, the area of the air core portion 14a of the primary air core coil 14). Being maintained prevents the efficiency of power transmission from being significantly reduced. This is because, as described above, the magnetic force lines have the largest magnetic density in the air core portion 14a.

  However, even if the overlapping area of the air core portions 14a, 24a of the primary and secondary air core coils 14, 24 is always the maximum, the entire secondary air core coil 24 is always flat with the primary air core coil 14. If they do not overlap visually, the transmission efficiency will deteriorate. This is because the eddy current induced by the magnetic field lines of the primary air-core coil 14 is generated on the surface of the secondary air-core coil 24. This is because, if a part of the secondary air-core coil 24 does not overlap the primary air-core coil 14 in plan view, the induction efficiency of eddy current is greatly reduced in the non-opposing region.

  When d2-d1 <D1-D2 which is outside the range of the expression (1) is satisfied, even if the entire secondary air-core coil 24 is necessarily overlapped with the primary air-core coil 14 in plan view, the primary and secondary In some cases, the overlapping area between the air-core portions 14a and 24a of the air-core coils 14 and 24 is not always the maximum, and the power transmission efficiency is deteriorated as compared with the present invention.

If the allowable deviation amount G is used, it can be expressed as equations (4) and (5) obtained by modifying equations (2) and (3) instead of equations (1) and (2).
D1 ≧ D2 + 2 × G (4)
d2 ≧ d1 + 2 × G (5)
Expressions (4) and (5) define Expression (1) using an allowable deviation amount G in the standard, and its technical significance is the same as Expressions (1), (2), and (3). .

  Next, the primary and secondary magnetic members 16 and 26 will be described. As shown in FIG. 3, when the primary and secondary magnetic members 16, 26 are rectangular, the length H1 of one side of the primary side magnetic member 16 is larger than the outer diameter D1 of the primary air-core coil 14, The length H2 of one side of the secondary magnetic member 26 needs to be larger than the outer diameter D2 of the secondary air-core coil 24.

In addition, in consideration of the above-described standard deviation allowable amount G, one side H2 of the secondary side magnetic member 26 is expressed by the following equation (6) between the outer diameter D1 of the primary air-core coil 14 and the allowable deviation G. ) Can be met.
H2 ≧ D1 + G × 2 Formula (6)
Thereby, even when a positional deviation occurs between the primary and secondary air-core coils 14 and 24, the secondary side magnetic member 26 covers the primary air-core coil 14, and the leakage magnetic field from the primary air-core coil 14. And the transmission efficiency can be improved. Note that the outer shape of the secondary magnetic member 26 is not limited as long as it is concentric with the center of the secondary air-core coil 24 and is equal to or larger than the area of a circle with an outer diameter H2 that satisfies H2 ≧ D1 + G × 2.

  Since the electronic device 20 in which the secondary coil unit 22 is arranged is required to be downsized, a metal, an electronic component, a circuit board, or the like is arranged on the back surface of the secondary coil unit 22. These can be protected from the magnetic flux by the member 26.

  In this sense, the secondary side magnetic member 26 may be formed larger than the protected member 28 (see FIGS. 6 and 7) such as a metal, an electronic component, or a circuit board. When the metal member or circuit board installed on the back surface of the secondary air-core coil 24 is larger than the secondary air-core coil 24, the secondary-side magnetic member 26 is made larger than those installed on the back surface. By doing so, the influence of the leakage magnetic field can be suppressed. In particular, as shown in FIG. 6, it has a shape larger than that of the protected member 28 and is formed so as to cover the side portion of the protected member 28, or as shown in FIG. 7, the secondary air-core coil 24. The influence of the leakage magnetic field can be suppressed because it is formed so as to cover the side portion of the. 6 and 7, the secondary side magnetic seal member 27 is disposed between the protected member 28 and the secondary side magnetic member 16.

  The secondary air-core coil 24 has an inner end and an outer end as shown in FIG. 2 by winding a coil wire. As shown in FIG. 8 (B), the inner end of the secondary air-core coil 24 does not pull out the inner-end coil wire 24b itself, but rather than the secondary air-core coil 24 as shown in FIG. 8 (A). Alternatively, the wiring pattern (first pattern) 30A formed on the thin flexible printed wiring board 30 may be drawn.

  In order to electrically connect the inner end of the secondary air-core coil 24 to the first pattern of the flexible printed circuit board 30, the inner end is soldered in the air-core portion 24a as shown in FIG. 32 or the like. In addition, since the coil wire is covered with an insulating layer, the insulating layer on the surface of the coil wire is eliminated during soldering. The thickness of the soldering portion 32 can be absorbed by the air core portion 24a.

  In FIG. 8B, the thickness of the secondary air-core coil 24 itself is the total thickness 2T of the two coil wires when the diameter of the coil wire is T. On the other hand, in FIG. 8A, since the thickness t of the printed circuit board 30 including the first pattern 30A can be made thinner than the diameter T of the coil wire (t <T), only (T−t). The thickness of the secondary air-core coil 24 itself can be reduced. Thereby, the thickness of the coil unit 22 can be reduced in the electronic device 20 that is required to be downsized.

  In addition, when drawing with a coil wire, it is difficult to draw the coil wire for a long time so as not to damage the insulating layer on the surface of the coil. It becomes. That is, the flexible printed wiring board 30 is thinner than the coil wire material, and the coil handling is easy.

  As shown in FIG. 8A, when the printed circuit board 30 is arranged on one side of the secondary air-core coil 24, the printed circuit board 30 is arranged on the transmission surface side, and the non-transmission on the opposite side to that is performed. What is necessary is just to arrange | position the secondary side magnetic member 26 mentioned above to the surface side.

  Although not shown, not only the inner end of the secondary air-core coil 24 but also the outer end may be connected to the wiring pattern (second pattern) of the flexible printed wiring board 30. Similarly, the inner end and the outer end of the primary air-core coil 14 may be connected to the wiring pattern printed on the flexible wiring printed board.

6 to 8 can also be applied to the primary coil unit of the charger 10. For this reason, the code | symbol of a primary side coil unit is attached | subjected to FIGS. That is, as the primary coil unit, the primary air-core coil 14, the primary magnetic member 16, and the primary magnetic shield member 17 can be arranged as shown in FIG. 6 or 7 with respect to the protected member 18. Moreover, the structure of FIG. 8 which has arrange | positioned the primary side air-core coil 14 on the flexible wiring board 30 is employable. In some cases, there is a demand for downsizing on the charger side, and in that case, it is useful to adopt the structure of FIGS. 6 to 8 in the primary coil unit. However, the primary coil unit is less affected by the secondary coil unit from the viewpoint of protecting the protected member 18. Therefore, without considering the standard deviation allowable amount G, one side H1 of the primary-side magnetic member 16 is not limited to a rectangle as long as the following equation (7) is satisfied between the outer diameters D1 of the primary air-core coil 14. It may be circular.
H1> D1 Formula (7)
3. Application example of electronic device This embodiment can be applied to all electronic devices that perform power transmission and signal transmission. For example, a wristwatch, an electric toothbrush, an electric shaving, a cordless phone, a personal handy phone, a mobile personal computer, a PDA (Personal Digital Assistants), and can be applied to a to-be-charged device and a charging device having a secondary battery such as an electric bicycle. According to the electronic device according to the present embodiment, since the coil unit itself is easily reduced in size, there is an advantage that the electronic device itself is easily reduced in size. Further, since the planar coil is provided in the coil unit, the planar coil can be easily assembled to an electronic device.

  Although the present embodiment has been described in detail as described above, those skilled in the art can easily understand that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings.

It is a figure which shows typically the charger and the electronic device charged in this charger, for example, the mobile telephone 20. It is a perspective view which shows typically the common structure of the coil unit of a primary side and a secondary side. It is a disassembled perspective view which shows typically the primary side and secondary side coil unit from which size differs. It is the top view which has arrange | positioned the primary air core coil and the secondary air core coil by making the centers correspond. It is a top view for demonstrating the tolerance | permissible deviation | shift amount on the specification of a primary air core coil and a secondary air core coil. It is a figure for demonstrating the structural example of a primary side and a secondary side magnetic member. It is a figure for demonstrating the other structural example of a primary side and a secondary side magnetic member. 8A and 8B are diagrams for explaining an example of drawing out the inner end of the secondary air-core coil.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Charger, 12 Primary side coil unit, 14 Primary air core coil, 14a Air core part, 14b Inner end coil wire, 14c Outer end coil wire, 16 Primary side magnetic member, 17 Primary side magnetic shield member, 18 Protected member , 20 Electronic equipment (cellular phone), 22 Secondary coil unit, 24 Secondary air core coil, 24a Air core part, 24b Inner end coil wire, 24c Outer end coil wire, 26 Secondary side magnetic member, 17 Secondary Side magnetic shield member, 28 member to be protected, 30 flexible printed circuit board, 30A first pattern, 32 soldering, 100 charging system

Claims (20)

An outer diameter of D1 is removably positioned diameter of the air-core portion is in the charger including a primary air-core coil is d1, an electronic device to be charged according to the power transmission based on the I Ri conductive magnetic induction in the charger There,
A secondary air-core coil having an outer diameter of D2 (D2 <D1) and an air-core portion having a diameter of d2 (d2>d1);
The secondary air-core coil satisfies d2-d1 ≧ D1-D2. In claim 1,
An electronic apparatus characterized by satisfying G ≦ (D1-D2) / 2, where G is a standard deviation tolerance of the center of the secondary air-core coil with respect to the center of the primary air-core coil. In claim 2,
An electronic device characterized by satisfying G ≦ (d2−d1) / 2. In claim 3,
The secondary air-core coil has a magnetic member provided on a non-transmission surface opposite to a transmission surface on the side receiving power transmission from the primary air-core coil,
The electronic apparatus is characterized in that the magnetic member is concentric with the center of the secondary air-core coil and has an area equal to or larger than an area of a circle with an outer diameter H2 that satisfies H2 ≧ D1 + G × 2. In claim 4,
A member to be protected which is provided on one surface of the magnetic member and opposite to the surface on which the secondary air-core coil is provided, and is a metal, electronic component or circuit board to be protected from leakage magnetic flux. In addition,
The said magnetic member has a shape larger than the said to-be-protected member, and is formed so that the side part of the to-be-protected member may be covered. In claim 4,
A protected member that is provided on one surface of the magnetic member opposite to the surface on which the secondary air-core coil is provided, and is a metal, electronic component, or circuit board that is to be protected from magnetic lines of force. Including
The said magnetic member has a shape larger than the said secondary air core coil, and is formed so that the side part of the said secondary air core coil may be covered. In any one of Claims 4 thru | or 6.
An electronic apparatus comprising a shield member for shielding leakage magnetic flux from the magnetic member on a surface opposite to a side where the magnetic member faces the secondary air-core coil. In any one of Claims 1 thru | or 7,
The secondary air-core coil further includes a printed wiring board formed thinner than the secondary air-core coil and printed with a first pattern for pulling out an inner end of the secondary air-core coil. In the air core part, an inner end of the secondary air core coil is connected to the first pattern of the printed wiring board. In claim 8,
An electronic apparatus, wherein a second pattern connected to an outer end of the secondary air-core coil is provided on the printed wiring board. An electronic device including a secondary air-core coil is detachably disposed, and is a charger that charges the electronic device by electromagnetic induction,
Including a primary air-core coil having an outer diameter D1 and an air-core portion diameter d1;
When the outer diameter of the secondary air-core coil is D2 and the diameter of the air-core portion is d2, the primary air-core coil satisfies D1> D2, d1 <d2, and d2-d1 ≧ D1-D2. A charger characterized by satisfying. In claim 10,
A charger satisfying G ≦ (D1−D2) / 2, where G is a standard deviation tolerance of the center of the secondary air core coil with respect to the center of the primary air core coil. An electronic device including a secondary air-core coil is detachably disposed, and is a charger that charges the electronic device by electromagnetic induction,
Including a primary air-core coil having an outer diameter D1 and an air-core portion diameter d1;
When the outer diameter of the secondary air-core coil is D2 and the diameter of the air-core portion is d2, the primary air-core coil satisfies D1> D2 and d1 <d2,
When the allowable displacement of the center of the secondary air-core coil with respect to the center of the primary air-core coil is G in the standard, D1 ≧ D2 + G × 2 and d2 ≧ d1 + G × 2 are satisfied,
The primary air-core coil has a magnetic member provided on a non-transmission surface opposite to a transmission surface on the side that transmits power to the secondary air-core coil,
The charger is characterized in that the magnetic member is concentric with the center of the primary air-core coil and has an area equal to or larger than the area of a circle having an outer diameter H1 that satisfies H1> D1. In claim 10 or 11,
The primary air-core coil has a magnetic member provided on a non-transmission surface opposite to a transmission surface on the side that transmits power to the secondary air-core coil,
The charger is characterized in that the magnetic member is concentric with the center of the primary air-core coil and has an area equal to or larger than the area of a circle having an outer diameter H1 that satisfies H1> D1. In claim 13,
A protected member, which is a metal, an electronic component, or a circuit board, which is provided on one surface of the magnetic member and opposite to the surface on which the primary air-core coil is provided, is further protected from leakage magnetic flux. Including
The magnetic member has a shape larger than that of the member to be protected, and is formed so as to cover a side portion of the member to be protected. In claim 13,
The magnetic member further includes a protected member that is provided on one surface of the magnetic member opposite to the surface on which the primary air-core coil is provided and is a metal, an electronic component, or a circuit board that is to be protected from the lines of magnetic force. ,
The said magnetic member has a shape larger than the said primary air-core coil, and is formed so that the side part of the said primary air-core coil may be covered. In any of claims 13 to 15,
The charger further comprising a shield member for shielding leakage magnetic flux from the magnetic member on a surface opposite to the side where the magnetic member faces the primary air-core coil. In any of claims 10 to 16,
The printed circuit board further includes a printed wiring board that is formed thinner than the primary air-core coil and on which a first pattern for drawing out an inner end of the primary air-core coil is printed. A charger characterized in that an inner end of the primary air-core coil is connected to the first pattern of the printed wiring board in the core. In claim 17,
A battery charger, wherein a second pattern connected to an outer end of the primary air-core coil is provided on the printed wiring board. A charger including a primary air-core coil having an outer diameter of D1 and an air-core portion of d1, and an electronic device including a secondary air-core coil having an outer diameter of D2 and an air-core portion of d2. and, in the charging system in which the thus charged by Ri conductive magnetic induction in an electronic device the charger is removably disposed in the charger,
The charging system, wherein the primary air-core coil and the secondary air-core coil satisfy D1> D2, d1 <d2, and satisfy d2-d1 ≧ D1-D2. A charger including a primary air-core coil having an outer diameter of D1 and an air-core portion of d1, and an electronic device including a secondary air-core coil having an outer diameter of D2 and an air-core portion of d2. and, in the charging system in which the thus charged by Ri conductive magnetic induction in an electronic device the charger is removably disposed in the charger,
The primary air-core coil and the secondary air-core coil satisfy D1> D2, d1 <d2,
When the allowable displacement of the center of the secondary air-core coil with respect to the center of the primary air-core coil is G in the standard, D1 ≧ D2 + G × 2 and d2 ≧ d1 + G × 2 are satisfied,
The primary air-core coil has a magnetic member provided on a non-transmission surface opposite to a transmission surface on the side that transmits power to the secondary air-core coil,
The charging system according to claim 1, wherein the magnetic member is concentric with the center of the primary air-core coil and has an area equal to or greater than an area of a circle having an outer diameter H1 that satisfies H1> D1.

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