JP5294793B2 - Non-contact transmission device - Google Patents

Description

  The present invention relates to a non-contact transmission device and a transmission-side core that exchange charging power or information in a non-contact manner from a non-contact transmission device having a core around which a coil is wound.

  2. Description of the Related Art In recent years, non-contact transmission devices that transmit charging power or information to an electronic device (non-contact transfer device) by a non-contact method such as electromagnetic induction have been disclosed. (For example, refer to Patent Documents 1 and 2) For example, some electronic devices are equipped with a rechargeable battery such as a secondary battery as a power source. As a method for charging the secondary battery, a non-contact method such as electromagnetic induction has become common.

5 to 7 are structural diagrams of such conventional contactless transmission apparatuses A5 to A7 and an electronic device (electronic timepiece) B. FIG. In the configuration of FIG. 5, the magnetic flux induced from the primary coil is transmitted to the secondary coil by looping the magnetic flux with the secondary core and the widened portion through the central convex portion of the primary core. To do. Usually, ε as an electromotive force of the secondary coil is expressed by the following equation.
ε = −dφB / dt
Here, the voltage and current applied to the primary coil are AC.

  By the way, as described above, the non-contact energy transmission from the charging device to the electronic device has been widely applied because it is easy to ensure the confidentiality of the electric power used as the energy compared to the liquid such as water. This is because it has the advantage. In other words, non-contact energy transmission does not require the connection to be exposed unlike contact-type energy transmission, so that it is possible to ensure more confidentiality, and it can be used for mobile phones and electronic watches that are electronic devices. Widely used.

  Normally, the charging device is stored in a housing molded using a resin that does not affect the magnetic flux density, and an electronic timepiece B is installed in a recess 69 of the housing 68 as shown in FIG. In this way, non-contact energy transmission is performed.

  Since the electronic timepiece can be used many times by charging the electronic timepiece and removing the electronic timepiece after the charging is completed in this way, in the case of an electronic timepiece using a primary battery that does not use a secondary battery. It is not necessary to replace the required primary battery, which is very convenient.

  By the way, when charging more rapidly, it is necessary to link more magnetic fluxes to the secondary side core. Therefore, as shown in FIG. -The gap of the widened portion 56 is configured to be as small as possible.

JP-A-9-130998 JP-A-11-195545

  However, in this prior art, the gap between the central convex portion, the secondary side core and the widened portion is configured to be as small as possible. Therefore, when the electronic timepiece is removed from the charging device after the non-contact charging is completed, the housing There was a problem that the gap between the inner periphery of the recess and the outer periphery of the electronic timepiece was small, and the electronic timepiece was difficult to remove from the charging device.

  In order to solve such a problem, as shown in FIG. 7, a gap d7 between the outer periphery of the electronic timepiece B and the inner wall of the housing recess 79 can be expanded. In this case, since the widened portion 76 is shorter than the conventional one, when the charging of the electronic timepiece B is completed, there is a space S7 in which a finger can be put between the electronic timepiece B and the inner wall of the housing recess 79. The electronic timepiece B can be easily removed.

  However, in such a configuration, since the gap between the secondary core b2 and the widened portion 76 is large, the coupling of the magnetic flux density is impaired during rapid charging, which may cause a magnetic loss. It was. In particular, when the electronic timepiece B is biased to one of the housing recesses 79 during charging, the gap between the secondary core b2 and the widened portion 76 on the other side is increased, so that the magnetic flux can be more coupled. As a result, there is a problem that the loss of energy transmission increases, resulting in a decrease in charging efficiency.

  In addition, in order to solve such a problem, a mechanism for fixing the electronic timepiece B to the charging device can be provided, but in this case, the charging device is enlarged and the convenience is deteriorated. There exists a problem that the manufacturing cost of a charging device increases.

  The present invention has been made in view of the above, facilitates the attachment / detachment of a non-contact transfer device such as an electronic timepiece, maintains the charging power or information transmission efficiency to the non-contact transfer device, and the device It is an object of the present invention to provide a non-contact transmission device that can be miniaturized to improve convenience.

  In order to solve the above-described problems and achieve the object, the invention according to claim 1 is configured to transmit charging power or information in a non-contact manner to a non-contact transfer device having a transfer-side core around which a transfer-side coil is wound. In the non-contact transmission device, a transmission-side core that has a convex portion near the center, and is disposed substantially coaxially opposite to the transmission / reception side core when transmitting the charging power or information to the non-contact transmission / reception device. A transmission-side coil wound around the convex portion, and the transmission-side core extends outward from the bottom of the convex portion and is provided upright at an end portion. A peripheral wall part that includes a surface, a widening part that extends inwardly from an upper end part of the peripheral wall part, and that receives the non-contact transfer device in a space formed by the inner wall surface and the upper surface of the convex part, It is provided at the lower part of the inner wall surface of the widened part, and is formed with a thickness smaller than the thickness of the widened part. The transmission-side coil is received in a space formed by the inner wall surface, the inner wall surface of the flange portion, and the upper surface of the convex portion by generating a magnetic flux together with the transmission-side core. An induced electromotive force is generated in a receiving / receiving coil of the non-contact transfer device, and the charging power or information is transmitted to the non-contact transfer device.

  According to the first aspect of the present invention, the electronic timepiece can be easily detached from the non-contact transmission device by forming the hook portion on which the electronic timepiece can be installed in the non-contact transmission device. By reducing the degree of freedom in the horizontal direction, it is possible to prevent a closed loop of magnetic flux due to the position shift of the electronic timepiece, and to improve the charging power or information transmission efficiency.

  Moreover, according to the invention concerning Claim 2, it is possible to reduce the core material used for the transmission side core, and at the same time, it is possible to reduce the weight or size of the non-contact transmission device.

  Moreover, according to the invention concerning Claim 3, it has the effect that the coupling | bonding property of magnetic flux can be maintained by having provided the magnetic body, and it becomes possible to charge rapidly.

  According to the invention of claim 4, the shape of the magnetic body is a perfect circle or square, so that the electronic timepiece installed on the non-contact transmission device is symmetrical vertically and horizontally with respect to the non-contact transmission device. Therefore, the degree of freedom in the rotation direction of the electronic timepiece is improved, and the magnetic flux coupling property is maintained, so that the energy transmission efficiency is not reduced.

Exemplary embodiments of a non-contact transmission apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings.
(Embodiment 1)
The non-contact transmission device (charging device) according to the first embodiment transmits charging power in a non-contact manner to a secondary side core (delivery side core) around which a secondary side coil (delivery side coil) is wound. It is. FIG. 1 is an explanatory diagram illustrating configurations of the charging device A1 and the electronic timepiece B according to the first embodiment. FIG. 2 omits the casing 18 in FIG. 1 for convenience of explanation. 1 and FIG. 2 show configurations relating to a power transmission portion in the charging devices A1 and A2 and a power receiving portion in the electronic timepiece B, and other configurations are omitted.

  First, the charging device A1 will be described. As shown in FIG. 1, the power transmission portion of the charging device A <b> 1 mainly includes a primary side core 12 and a primary side coil 11 wound around the primary side core 12.

  The primary side core 12 is a ferrite core or the like whose main component having magnetic characteristics is formed of a manganese-based metal, and the secondary side core of the electronic timepiece B is charged when charging power to the electronic timepiece B. It is arranged so as to be substantially coaxial with b2. Further, the primary side core 12 is provided with a convex portion 13 near the center, and extends outward from the bottom of the central convex portion 13, and is provided with an outer peripheral standing at the end portion, and includes the peripheral surface of the convex portion 13. A peripheral wall portion 15 is provided. The casing 18 is formed of a resin that does not affect the magnetic flux along the shape of the primary core 12.

  The distance and the positional relationship between the primary side core central convex part 13 and the secondary side core b2 are shown in FIGS. Equal to distance and positional relationship.

  The distance and the positional relationship between the primary side core 12 and the secondary side core b2 are the distance and the positional relationship between the primary side core 52 or the 62-2 secondary side core b2 in the prior art described later as shown in FIGS. be equivalent to.

  The peripheral wall portion 15 extends to the upper end portion thereof, and includes a widened portion 16 above the upper surface of the convex portion 13, and the widened portion 16 is provided with a flange portion 17 having a thickness h1 and a width d. The flange portion 17 is formed by cutting a part of the upper surface of the widened portion 16 over the width d by a depth h2.

  Next, the electronic timepiece B will be described. As shown in FIG. 1, the transfer part of the electronic timepiece B mainly includes a secondary core b2 and a secondary coil b1. The secondary core b2 is a ferrite core or the like whose main component having magnetic properties is formed of a manganese-based metal, and generates magnetic flux together with the secondary coil b1 wound around the secondary core b2. is there.

  Here, a method of charging the electronic timepiece B from the charging device A1 or A2 will be described. On the charging device side, the power supplied from an AC power source or the like is rectified from an alternating current to a direct current, and the rectified power is converted into an alternating current, and then the primary wound around the primary core central convex portion 13. Supplyed to the side coil 11, magnetic flux is generated by the primary side core 12 and the primary side coil 11. Then, an electric power is transmitted to the electronic timepiece B in a non-contact manner by generating an AC electromagnetic field (induced electromotive force) in the secondary coil b1 of the electronic timepiece B.

  On the other hand, on the electronic timepiece B side, an AC electromagnetic field generated in the primary coil 11 is detected, and an induced electromotive force corresponding to the AC electromagnetic field is generated, thereby receiving power from the charging device A1 in a non-contact manner. . Then, the received power is rectified to DC power and stored in the secondary battery b0 as charging power.

  Here, the operation when the electronic timepiece B is attached to and detached from the conventional charging device A5 or A6 will be described. As shown in FIG. 5 or FIG. 6, when the electronic timepiece B is mounted on the conventional charging device A5 or A6, the electronic timepiece B is stored in the central recess 50 of the charging device A5 or the housing recess 69 of the charging device A6. To do. At this time, if the difference between the outer diameter Lb of the electronic timepiece B and the inner diameter L5 or the inner diameter L6 of the central recess 50 in the charging device is 2d5 or 2d6, 2d5 = L5-Lb or 2d6 = L6-Lb. And the gap between the inner peripheries of the central recess, that is, the gap into which the finger can be inserted during removal is d5 or d6 on the left and right. In the conventional charging device A5 or A6, the gap d5 or d6 is designed to be as small as possible in order to improve the magnetic flux coupling during charging.

  As described above, in the charging device of the conventional form, the electronic timepiece B having an arbitrary thickness and weight is obtained by inserting a finger into the narrow gap between the central recessed portion 50 or the housing recessed portion 69 of the charging device A5 or A6 and the electronic timepiece B. Is picked up vertically and the electronic timepiece B is taken out from the charging device A5 or A6.

  On the other hand, FIG. 7 shows a conventional charging device A7 when the inner diameter L7 is larger than the inner diameter L6 in FIG. 6 to expand the gap d7 between the casing inner diameter and the outer periphery of the electronic timepiece B. In this case, a sufficient space S7 for inserting a finger between the electronic watch B and the inner periphery of the housing 78 can be secured, and the electronic watch B can be easily attached and detached as compared with the case of FIGS. It becomes possible to do.

  However, when the electronic timepiece B is installed in the charging device A7, since the gap d7 is large, the position of the electronic timepiece B is shifted in the housing recess, and the symmetry of the electronic timepiece B with respect to the primary core 72 is lost. Therefore, there exists a problem that energy transmission efficiency may fall.

  For this reason, charging apparatus A1 concerning this Embodiment has solved the problem of such a conventional apparatus by the structure mentioned above. Hereinafter, an operation when the electronic timepiece B is attached to and detached from the charging device A1 of the present embodiment will be described. As shown in FIG. 1, the difference between the inner diameter L1 of the housing recess 19 of the charging device A1 and the outer diameter of the electronic timepiece B is represented by 2d1 = L1−Lb.

  As described above, in the present embodiment, since the space S1 is provided by the provision of the flange portion 17, even when the gap d1 is set to be large, displacement of the electronic timepiece B in the housing recess is prevented. In addition, the electronic timepiece B can be easily picked up by inserting a finger into the space S1 during attachment / detachment. Further, since the flange portion 17 is produced by cutting the upper portion of the primary core widened portion 16, the core material can be reduced, and the primary core 12 can be reduced in weight or size. Furthermore, in this embodiment, the positional relationship between the primary side core 12 and the secondary side core b2 is such that the primary side cores 52, 62, 72 and the secondary side core b2 in the conventional form shown in FIGS. Therefore, the energy transmission efficiency at the time of charging in the present embodiment does not decrease as compared with the conventional technology.

(Embodiment 2)
The charging device A1 of the first embodiment is configured by cutting the widened portion 16 and integrally forming the flange portion 17. However, in the charging device of the present embodiment, a magnetic body is installed in the widened portion. The case where a collar part is comprised is demonstrated.

  FIG. 3 is an explanatory diagram illustrating configurations of the charging device A3 and the electronic timepiece B according to the second embodiment. Here, since the configuration and function of the electronic timepiece B are the same as those of the electronic timepiece in the first embodiment, the description thereof is omitted. As shown in FIG. 3, the charging device A <b> 3 mainly includes a primary side core 32, a primary side coil 11, and a housing 38. Here, since the configuration, arrangement, and function of the primary coil 11 and the housing 38 are the same as those in the first embodiment, the description thereof is omitted.

  Similar to the first embodiment, the primary core 32 of the second embodiment includes the convex portion 13, the peripheral wall portion 15, and the widened portion 36. Here, the convex portion 13 and the peripheral wall portion 15 are the same as those in the first embodiment. Further, the material, arrangement, and function of the primary core 32 are the same as those in the first embodiment, and thus the description thereof is omitted.

  The widened portion 36 of the second embodiment includes a magnetic body M1 on the inner periphery of the widened portion, and the magnetic body M1 forms a flange portion. The magnetic material M1 is preferably made of the same material as the primary side core 32 in order to improve the magnetic flux coupling property, or is preferably made of a material having a higher magnetic permeability than the primary side core 32. Further, the magnetic body M1 has an annular shape that follows the shape of the electronic timepiece B, that is, a perfect circle or a square.

  In this embodiment, since the flange portion is formed by the magnetic body M1, the magnetic flux generated from the primary side coil 11 passes through the central convex portion 13 of the primary side core 32 and passes through the secondary side core b2 to be magnetic. A magnetic flux loop to the body M1 occurs. Since the magnetic body M1 is closer to the secondary core b2 than when the conventional charging device A7 shown in FIG. 7 is used, the charging efficiency increases.

  In the present embodiment, by providing the magnetic body M1, the magnetic flux coupling property can be improved during charging, and the charging efficiency during quick charging can be improved. At the same time, since the magnetic body M1 functions as a collar, the degree of freedom in the horizontal direction of the electronic timepiece B is reduced, and the closed loop of the magnetic flux due to the displacement of the electronic timepiece B can be prevented in advance. Transmission efficiency can be improved. Further, since the shape of the magnetic body M1 is an annular shape that follows the shape of the electronic timepiece B, the electronic timepiece B is vertically and horizontally symmetrical with respect to the charging device A3. In addition, since the magnetic flux coupling property is maintained, the energy transmission efficiency can be maintained.

(Embodiment 3)
The charging device A3 of the second embodiment is configured by installing the magnetic body M1 on the inner periphery of the widened portion 36 and using the magnetic body M1 as a flange, but in the charging device of the present embodiment, the magnetic device M3 is magnetic. The body is provided separately from the widened portion, and the heel portion is configured by installing the body on the upper surface of the housing recess.

  FIG. 4 is an explanatory diagram illustrating configurations of the charging device A4 and the electronic timepiece B according to the third embodiment. Here, since the configuration and function of the electronic timepiece B are the same as those of the electronic timepiece in the first embodiment, the description thereof is omitted. The charging device A4 mainly includes a primary core 42, a primary coil 11, and a casing 48. Here, the configuration, arrangement, and functions of the primary coil 11 and the casing 48 are the same as those in the first embodiment, and thus the description thereof is omitted.

  Similar to the first embodiment, the primary core 42 according to the third embodiment includes the central convex portion 13, the peripheral wall portion 15, and the widened portion 46. Here, the central convex portion 13 and the peripheral wall portion 15 are the same as those in the first embodiment. Further, the material, arrangement, and function of the primary core 42 are the same as those in the first embodiment, and thus the description thereof is omitted.

  The widened portion 46 of the present embodiment is different from the widened portion 36 of the third embodiment in that the magnetic body M1 is not provided. In the present embodiment, a substantially ring-shaped magnetic body M <b> 2 is provided at a position on the casing 48 that is separated from the inner wall surface side of the widened portion 46. That is, as shown in FIG. 4, the casing 48 has a recess 49 formed on the upper surface thereof. And the magnetic body M2 is installed on the concave portion 49 at a position separated from the widened portion 46. That is, the magnetic body M <b> 2 forms a flange in the recess 49. Since the material and shape of the magnetic body M2 are the same as those of the magnetic body M1 in the second embodiment, description thereof is omitted.

  In the present embodiment, an effect equivalent to that obtained in the second embodiment is obtained, and at the same time, the magnetic body M2 is installed on the upper surface of the housing recess to form a collar portion. The structure of the body 48 is simplified, thus simplifying the manufacturing process and reducing the manufacturing cost.

FIG. 3 is an explanatory diagram illustrating configurations of an electronic timepiece B and a charging device A1 according to the first embodiment. It is a figure which shows the state which abbreviate | omitted the housing | casing in charging device A2 of Embodiment 1. FIG. It is a figure which shows the structure of the electronic timepiece B and charging device A3 concerning Embodiment 2. FIG. It is a figure which shows the structure of the electronic timepiece B and charging device A4 concerning Embodiment 3. FIG. It is a figure which shows the structure of the conventional charging device A5 and the electronic timepiece. It is a figure which shows the structure of the conventional charging device A6 and the electronic timepiece. It is a figure which shows charging device A7 and electronic timepiece B which expanded the internal diameter L6 of the housing | casing recessed part of charging device A6 to L7.

Explanation of symbols

A1, A2, A3, A4, A5, A6, A7 Charging device 50 Central recess 11 Primary coil 12, 32, 42, 52, 62, 72 Primary core 13 Central protrusion 15 Peripheral wall 16, 36, 46 , 56, 76 Widening portion 17 Gutter portion 18, 38, 48, 68, 78 Housing 19, 49, 69, 79 Recessed portion M1, M2 Magnetic body B Electronic timepiece b0 Secondary battery b1 Secondary coil b2 Secondary core L1, L5, L6, L7 Inner diameter Lb Outer diameter d1, d5, d6, d7 Gap d Width h1 Thickness h2 Depth S1, S7 Space

Claims (5)

In a non-contact transmission device that transmits charging power or information in a non-contact manner to a non-contact transmission / reception device having a transmission / reception side core wound with a transmission / reception side coil.
A transmission side core that has a convex portion near the center and is disposed substantially coaxially with the sending / receiving side core when transmitting the charging power or information to the non-contact giving / receiving device,
A transmission side coil wound around the convex part,
The transmission side core is:
A peripheral wall portion extending outward from the bottom of the convex portion, provided standing at the end, and enclosing the peripheral surface of the convex portion;
A widening portion that extends inward from the upper end portion of the peripheral wall portion and receives the non-contact transfer device in a space formed by an inner wall surface and the upper surface of the convex portion,
Provided at the lower portion of the inner wall surface of the widened portion, and comprising a collar portion formed with a thickness thinner than the thickness of the widened portion,
The transmission-side coil generates and transmits a magnetic flux together with the transmission-side core, thereby transmitting and receiving the non-contact transmission / reception device received in a space formed by the inner wall surface and the inner wall surface of the flange and the upper surface of the convex portion. A non-contact transmission device that generates an induced electromotive force in a side coil and transmits the charging power or information to the non-contact transfer device.   The contactless transmission device according to claim 1, wherein the flange portion is integrally formed with the widened portion.   The non-contact transmission device according to claim 1, wherein the flange portion is formed of a magnetic material.   The contactless transmission device according to claim 3, wherein the magnetic body is provided in the widened portion.   The non-contact transmission device according to claim 3, wherein the magnetic body is provided apart from the widened portion and is formed in an annular shape along the shape of the non-contact transfer device.

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