JP5363720B2 - Non-contact transfer device and transfer core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To thin a thickness, to lighten a weight, and to prevent a transmission efficiency of charge electric power or information from a noncontact transception device from getting low. <P>SOLUTION: An electronic timepiece 100 for transceiving noncontactly the charge electric power or the information from a charger 500 is provided with a secondary side core 120 having a protrusion 121 in the vicinity of its central part, and arranged substantially coaxially opposed to a primary side core 520, when transceiving the electric power or the information from the charger 500, and a secondary side coil 110 wound around the protrusion 121, the secondary side core 120 has a through-hole 150, an opening area or an opening width of an opening part 150a in a face side opposed to the primary side core 520 is different from an opening area or an opening width of an opening part 150b in a face side not opposed to the primary side core 520, in the through-hole 150, and the secondary side coil 110 transceives the electric power or the information from the charger 500, by generating an induced electromotive force from a magnetic flux generated by a primary side coil 510 and the primary side core 520. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a contactless transmission / reception apparatus and a transmission / reception core that transmit and receive charging power or information in a contactless manner from a contactless transmission apparatus having a core wound with a coil.

  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, a rechargeable battery such as a secondary battery is mounted on an electronic device as a power source, and a method for charging a secondary battery or the like of the electronic device from a charging device (non-contact transmission device) is a non-contact method such as electromagnetic induction. The method by is becoming common.

  In addition, a charging device (power supply device) having a primary core (transmission-side core) that is thin and efficiently transmits charging power, and a secondary core (delivery-side core) that transfers charging power from the charging device. (For example, refer patent document 1). 14 is a cross-sectional view illustrating the primary core 530 of the power supply device 550 and the secondary core 620 of the electronic device 600 in Patent Document 1. As shown in FIG. 14, in the technique of Patent Document 1, the shape of the primary core 530 around which the primary coil 510 is wound is I-type, and the shape of the secondary core 620 around which the secondary coil 610 is wound is used. By configuring as a T type, a thin secondary coil 610 capable of receiving the magnetic flux (M3, M4) generated by the primary power supply device 550 (non-contact transmission device) on the entire surface can be realized, and the secondary coil can be realized. The non-contact energy (charging power) can be efficiently transmitted to 610.

  Further, a non-contact electromagnetic induction charging mechanism (charging device 500 and electronic device 700 in FIG. 15) that contributes to weight reduction of electronic devices such as mobile phones is disclosed (for example, see Patent Document 2). FIG. 15 is a cross-sectional view illustrating a primary coil 510 and a secondary coil 710 of a contactless electromagnetic induction charging mechanism in Patent Document 2. In the technique of Patent Document 2, even if the portion of the core 720 of the secondary coil 710 that has a low magnetic flux density that hardly contributes to the electromagnetic induction of the core 520 of the primary coil 510 is cut away, the primary and secondary coils are not in contact with each other. Utilizing the fact that the transmission efficiency of energy (charging power) hardly decreases. As shown in FIG. 15, a through-hole 750 (or a recess is also possible) in a portion where the magnetic flux density of the core 720 of the secondary coil 710 is low. To reduce the weight of the core 720 of the secondary coil 710, that is, to reduce the weight of the contactless electromagnetic induction charging mechanism.

  Here, when the secondary side (electronic device) is a non-contact type electronic timepiece, enabling the electronic timepiece to be thin improves the visual and design freedom of the electronic timepiece. In addition, enabling the weight reduction of the electronic timepiece improves convenience such as ease of carrying for the user. Therefore, in recent years, it has been desired to make it possible to design a thin and lightweight electronic timepiece, not only when a non-contact charging method is used.

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

  However, in a non-contact type electronic timepiece, a secondary battery used therein is generally a coin-type battery mainly from the viewpoint of thinness. In the second technique, the secondary battery can only be disposed below or above the secondary side core (electronic watch side core). As a result, since the thickness of the secondary battery is required in addition to the thickness of the secondary core, it is difficult to reduce the thickness of the electronic timepiece (electronic device). Further, not only the secondary battery but also other electronic components are arranged inside the electronic timepiece, and it is difficult to make the electronic timepiece thinner.

  Here, for example, in order to reduce the thickness of the electronic timepiece, the secondary core is removed, and a secondary battery or the like is attached to the air core portion of the secondary coil, which is a space formed by removing the secondary core. Although the method of arrange | positioning can be considered, since the secondary side core is removed, since the transmission efficiency of the energy (charging power) by the non-contact by a charging device will fall, it is not preferable.

  The present invention has been made in view of the above, and it is possible to reduce the thickness and weight by forming a through hole in which a secondary battery or the like can be arranged, and from the non-contact transmission device even if the through hole is provided. It is an object of the present invention to provide a contactless transmission / reception apparatus and a transmission / reception side core that do not lower the charging power or the transmission efficiency of information.

In order to solve the above-mentioned problems and achieve the object, the invention according to claim 1 is a non-contact transmission / reception of non-contact charging power or information from a non-contact transmission device having a transmission side core wound with a transmission side coil. In the contact transfer device, a transfer side core having a convex portion near the center and disposed substantially coaxially with the transmission side core when the charging power or information is transferred from the non-contact transmission device , and a wound has been exchanged coil to said convex portion, wherein the transfer side core has a through hole, the through hole has a first opening in a surface facing the transmission side core, wherein The opening area or the opening width of the second opening on the surface side not facing the transmission-side core is different, and the width of the hollow portion of the receiving and receiving side coil is the width of the first opening and the width of the second opening. greater than the width, the transfer coil, the transmission coil and the front By generating the induced electromotive force by detecting the magnetic flux generated by the transmission-side core, characterized by exchanging the charge power or information from the non-contact transmission device.

  The invention according to claim 2 is the non-contact transfer device according to claim 1, wherein the through-hole has a convex cross-sectional shape, and the opening area of the first opening is the same as that of the second opening. It is smaller than the opening area.

  The invention according to claim 3 is the non-contact transfer device according to claim 1 or 2, wherein the through hole has an opening width of the second opening wider than an opening width of the first opening. It is characterized by.

  According to a fourth aspect of the present invention, in the non-contact transfer device according to any one of the first to third aspects, the through hole has an opening width of the first opening, and the transmission side coil is wound. It is characterized in that it is larger than either the outer width of the convex portion near the center of the transmission-side core or the width of the hollow portion of the transmission-side coil and smaller than the outer width of the transmission-side coil.

  According to a fifth aspect of the present invention, in the contactless transmission / reception apparatus according to the fourth aspect, the through hole has an opening width of the first opening generated in the transmission side coil. The area of the magnetic flux when passing through the housing is widened with a maximum width that is within a range that does not extremely reduce the magnetic flux passing through the delivery-side core.

  The invention according to claim 6 is the non-contact transfer device according to any one of claims 1 to 5, further comprising a power storage unit that stores the charging power or information, wherein the through hole includes the The opening width of the second opening is approximately the same length as the outer width of the power storage unit.

  The invention according to claim 7 is the non-contact transfer device according to claim 6, wherein the thickness of the through hole is substantially the same as the thickness of the power storage unit. .

Further, the invention according to claim 8 detects the magnetic flux generated by the transmission side coil and the transmission side core in the non-contact transmission device to generate an induced electromotive force, so that the charging power from the non-contact transmission device. Alternatively, in the sending / receiving core for sending / receiving information, the sending / receiving core has a convex portion and a through hole in the vicinity of the center, and is substantially the same as the transmission-side core when charging power or information is sent / received from the non-contact transmission device. The through-holes are arranged so as to face each other on the same axis, and the through hole has an opening area or an opening width between a first opening on the opposite surface side of the transmission-side core and a second opening on the surface side that does not face the transmission-side core. And the width of the hollow portion of the transmitting / receiving coil is larger than the width of the first opening and the width of the second opening .

  According to the present invention, a through-hole in which a secondary battery or the like can be placed is formed to reduce the thickness and weight, and even if the through-hole is provided, charging power or information transmission efficiency from the non-contact transmission device is improved. It has the effect of not being lowered.

  Exemplary embodiments of a non-contact transfer device according to the present invention will be explained below in detail with reference to the accompanying drawings. In the following, an example in which the non-contact transfer device of the present invention is applied to an electronic timepiece is shown, but is not limited thereto, for example, a portable device such as a mobile phone, an electronic device such as an electric shaver or an electric toothbrush, Any device that includes a secondary battery and can be charged by a charging device that is a non-contact transmission device is applicable as a non-contact transfer device.

(Embodiment 1)
The electronic timepiece according to the first embodiment exchanges charging power in a non-contact manner from a charging device having a primary side core (transmission side core) around which a primary side coil (transmission side coil) is wound. FIG. 1 is an explanatory diagram illustrating configurations of the electronic timepiece 100 and the charging device 500 according to the first embodiment. Note that FIG. 1 shows a configuration related to a power transmission portion in the charging device 500 and a power receiving portion in the electronic timepiece 100, and other configurations are omitted.

  First, the electronic timepiece 100 will be described. As shown in FIG. 1, the power receiving portion of the electronic timepiece 100 mainly includes a secondary side core 120 having a convex portion 121 near the center and a secondary side coil 110.

  The secondary side core 120 is a ferrite core or the like whose main component having magnetic properties is made of a manganese-based metal. When the charging power is charged from the charging device 500, the secondary side core 120 and the primary side core 520 of the charging device Oppositely arranged on the same axis.

  The convex portion 121 is a columnar convex portion provided near the center of the secondary core 120, and further has a through hole 150 inside the center.

  As shown in FIG. 1, the through-hole 150 has a convex cross-sectional shape in the vertical direction and a circular cross-section in the horizontal direction, and is on the opposite surface side facing the primary core 520 of the charging device 500. The opening area or the opening width of the opening 150a and the opening 150b on the surface side that does not face the primary core are different. That is, in the through hole 150, the opening area of the opening 150a is smaller than the opening area of the opening 150b, the opening diameter (opening width) of the opening 150a is h1, and the opening diameter (opening width) of the opening 150b is set. h2 is satisfied, and the relationship of h1 <h2 is satisfied. In addition, since the cross-sectional shape of the through hole 150 is a convex shape, the flange 121a is formed on the side of the secondary core 120 that faces the charging device 500. Moreover, the through-hole 150 is wider than the opening diameter of the opening part 150a until the opening diameter of the opening part 150b is the range in which the secondary side core 120 does not saturate the magnetic flux.

  The secondary side coil 110 is an electric wire wound around the convex portion 121 of the secondary side core 120, and generates a magnetic flux together with the secondary side core 120.

  Next, the charging apparatus 500 will be described. As shown in FIG. 1, the power transmission part of the charging device 500 mainly includes a primary core 520 having a convex portion 521 near the center and a primary coil 510.

  The primary core 520 is a ferrite core or the like whose main component having magnetic properties is formed of a manganese-based metal, and has the convex portion 521 near the center as described above.

  The convex portion 521 is a columnar convex portion provided near the center of the primary core 120.

  The primary side coil 510 is an electric wire wound around the convex portion 521 in the primary side core 520 and generates magnetic flux together with the primary side core 520.

  Here, a charging method from the charging device 500 to the electronic timepiece 100 will be described. On the charging device side, power supplied from an AC power source or the like is rectified from alternating current to direct current, and the rectified power is converted into alternating current, and then the primary coil 510 wound around the primary core 520 is used. The primary side core 520 and the primary side coil 510 generate magnetic flux. Then, electric power is transmitted to the electronic timepiece 100 in a non-contact manner by generating an AC electromagnetic field (induced electromotive force) in the secondary coil 110 of the electronic timepiece 100.

  On the other hand, on the electronic timepiece 100 side, the AC electromagnetic field generated in the primary coil 110 is detected, and an induced electromotive force corresponding to the AC electromagnetic field is generated to receive power from the charging device 500 in a non-contact manner. . Then, the received power is rectified into a direct current and stored in the secondary battery as charging power.

  Next, the configuration of an electronic timepiece using a conventional technique will be described. FIG. 2 is an explanatory diagram showing the configuration of the charging device 500 and the conventional electronic timepiece 700. In FIG. 2, as in FIG. 1, the configuration related to the power transmission portion in the charging device 500 and the power receiving portion in the electronic timepiece 700 (see Patent Document 2) is shown, and the other configurations are omitted. Here, the configuration and function of the power transmission part of the charging device 500 are the same as those in FIG.

  As shown in FIG. 2, the power receiving portion of the electronic timepiece 700 mainly includes a secondary side core 720 having a convex portion 721 near the center and a secondary side coil 710. Here, the configuration and function of the secondary side coil 710 are the same as those of the secondary side coil 110 in the electronic timepiece 100 of the present embodiment, and thus the description thereof is omitted.

  The secondary core 720 is a ferrite core whose main component having magnetic properties is formed of a manganese-based metal.

  The convex portion 721 is a columnar convex portion provided near the center of the secondary side core 720, and further has a through hole 750 inside the center.

  The through-hole 750 is provided in a portion where the magnetic flux density of the secondary core 720 is low, and has a cylindrical shape with an opening diameter (opening width) of h1. Note that the magnetic fluxes M1 and M2 in FIG. 2 indicate the flow of magnetic flux generated from the primary side core 520 and the primary side coil 510. Referring to FIG. It can be seen that the magnetic flux density is provided in a portion having a low magnetic flux density.

  Here, the current that flows through the secondary coil 710 in the electronic timepiece 700 of the prior art will be described. FIG. 3 is a graph showing the relationship between the current value of the current flowing through the secondary coil 710 and the opening diameter (opening width) of the through hole 750 of the secondary core 720. A point a in FIG. 3 is a plot of the current value of the current flowing through the secondary coil 710 in the conventional electronic timepiece 700 in FIG. 2 (the opening diameter (opening width) of the through hole 750 is h1).

  Next, the current when the opening diameter of the through hole 750 in the conventional electronic timepiece 700 (see FIG. 2) is gradually widened from h1 to h3 and h2 will be described. FIG. 4 is a diagram showing a configuration of a conventional electronic timepiece 700 when the opening diameter of the through hole 750 is widened to h3. FIG. 5 is a diagram showing a configuration of a conventional electronic timepiece 700 when the opening diameter of the through hole 750 is widened to h2. Here, the opening diameter of the through hole 750 satisfies the relationship of h1 <h3 <h2. As shown in FIG. 4, h <b> 3 has substantially the same diameter as the outer diameter (outer width) of the primary coil 510. Further, as shown in FIG. 5, h <b> 2 is a diameter larger than the outer diameter (outer width) of the primary coil 510.

  The broken line b in FIG. 3 shows the current value of the current flowing in the secondary coil 710 as the opening diameter of the through-hole 750 in the prior art electronic timepiece 700 gradually increases from h1 to h3 and h2. It is connected by dot plot. Referring to FIG. 3, the point b1 is a case where the opening diameter of the through-hole 750 is gradually increased from h1 to reach h3. Further, the point b2 is a case where the opening diameter of the through hole 750 is gradually increased from h3 and reaches h2.

  As described above, in the conventional electronic timepiece 700, the current flowing through the secondary coil 710 decreases from the point where the opening diameter of the through hole 750 exceeds h3. This is because when the magnetic flux induced by the primary side coil 510 is converged on the primary side core 520 toward the secondary side core 720, the opening diameter of the through hole 750 is too wide as shown in FIG. This is because the magnetic flux hardly reaches the secondary side core 720 and the secondary side coil 710.

  Next, a current when the opening diameter of the opening 150b of the through hole 150 in the electronic timepiece 100 of the present embodiment is gradually widened from h1 to h3 and h2 will be described. The lengths h1, h3, and h2 are the same as those of the above-described conventional electronic timepiece 700.

  A broken line c in FIG. 3 indicates the current value of the current flowing in the secondary coil 110 when the opening diameter of the opening 150b of the through hole 150 in the electronic timepiece 100 is gradually widened from h1 to h3 and h2. It is connected by plotting several points. In addition, since the opening diameter of the opening 150a of the through-hole 150 is the state hold | maintained, it is still h1. Referring to FIG. 3, the point c1 is a case where the opening diameter of the opening 150b of the through hole 150 is gradually increased from h1 to reach h3. Furthermore, the point c2 is a case where the opening diameter of the opening 150b of the through-hole 150 is gradually increased from h3 and reaches h2.

  Thus, in the electronic timepiece 100 of the present embodiment, even if the opening diameter (opening width) of the opening 150b of the through hole 150 changes from h1 to h3 and h2, the current flowing through the secondary coil 110 is almost equal. In other words, a current substantially equal to that in the case where the opening diameters of the through holes 750 in the electronic timepiece 700 of the prior art are h1 to h3 flows.

  As described above, in the electronic timepiece 100 according to the first embodiment, even when the secondary core 120 is provided with the through hole 150 having a convex cross section, the current flowing in the secondary side coil 110 is supplied to the electronic timepiece 700 of the prior art. The current flowing in the secondary coil 710 can be maintained at substantially the same level as that of the secondary coil 710, and the transmission effect is not lowered. In addition, if the opening diameter of the opening 150b of the through hole 150 is set within the range of h1 to h2, the current flowing through the secondary coil 110 can be kept substantially constant, so the opening diameter is within the range of h1 to h2. Can be freely changed (in FIG. 1, h2). Therefore, since electronic parts such as a substrate and a secondary battery can be arranged in a space formed in the through hole 150 in which the opening diameter of the opening 150b is in the range of h1 to h2, the electronic watch 100 can be thinned and The weight can be reduced.

  When the opening 150b of the through-hole 150 is further widened and the opening diameter exceeds h2, the thickness h ′ around the opening 150b of the secondary core 120 becomes extremely narrow, so the secondary core In addition to making the manufacture of 120 difficult, magnetic flux saturation of the secondary core 120 may be caused. In such a case, it is possible to increase the inner diameter of the secondary coil 110 (the width of the hollow portion) or to use a material having excellent B-H characteristics of the secondary core 120 so that the secondary core 120 can be used. The problem of difficulty in manufacturing can be avoided.

(Embodiment 2)
The electronic timepiece 100 according to the first embodiment is configured such that the opening diameter of the opening 150b on the surface side that does not face the charging device in the through hole 150 can be changed in the range of h1 to h2. The timepiece will be described with respect to a case where the opening diameter of the opening portion of the facing surface facing the charging device in the through hole is changed.

  First, an experiment in the case where the opening diameter of the opening 150a of the through hole 150 in the electronic timepiece 100 of Embodiment 1 is gradually widened from h1 to h3 and h2 will be described. In addition, the opening diameter of the opening 150b of the through hole 150 is in a state of being held at h2. The lengths of h1, h3, and h2 are the same as in the first embodiment.

  FIG. 6 is a diagram illustrating a configuration of the electronic timepiece 100 according to the first embodiment when the opening diameter of the opening 150a of the through hole 150 is widened to h3. FIG. 7 is a diagram illustrating a configuration of the electronic timepiece 100 according to the first embodiment when the opening diameter of the opening 150a of the through hole 150 is widened to h2. FIG. 8 is a graph showing the relationship between the current value of the current flowing through the electronic timepiece 100 and the opening diameter of the opening 150 a of the through hole 150 of the secondary core 120.

  The broken line d in FIG. 8 shows several values of the current flowing through the secondary coil 110 when the opening diameter of the opening 150a of the through hole 150 in the electronic timepiece 100 of Embodiment 1 is widened to h1 to h2. Plotted and connected. The broken line e is directly below the secondary coil 110 and the secondary core 120 (not shown) when the opening diameter of the opening 150a of the through hole 150 in the electronic timepiece 100 of Embodiment 1 is widened to h1 to h2. The values of the eddy current loss occurring in the casing portion in FIG. In addition, the broken line f indicates the current value of the current flowing through the secondary coil 110 when the opening diameter of the opening 150a of the through hole 150 in the electronic timepiece 100 of Embodiment 1 is widened to h1 to h2, and the housing. The transmission efficiency value calculated from the value of the eddy current loss occurring in the entire model including the body part and the value of the copper loss of the primary coil 510 is connected by plotting several points.

Here, a method for calculating the transmission efficiency will be described. The transmission efficiency is calculated from the current value of the current flowing through the secondary coil 110, the value of the eddy current loss occurring in the entire model including the casing portion, and the value of the copper loss of the primary coil 510. When doing so, it can be calculated by the following formula.

  The denominator of the above formula originally includes hysteresis loss, but since the value of hysteresis loss is relatively small compared to eddy current loss and copper loss, the calculation method of transmission efficiency in the present embodiment Then, the hysteresis loss and the like are omitted, and the above formula is adopted.

  Referring to FIG. 8, the current flowing through the secondary coil 110 is substantially constant (see the broken line d) when the opening diameter of the opening 150a of the through hole 150 is in the range of h1 to h3, whereas the housing Since the eddy current flowing through the line decreases (see the broken line e), the transmission efficiency is improved (see the broken line f).

  Further, when the opening diameter of the opening 150a of the through hole 150 is in the range of h3 to h2, both the current flowing through the secondary coil 110 and the eddy current flowing through the housing are reduced (see the broken lines d and e). . In this case, the eddy current flowing through the housing is reduced, but the current flowing through the secondary coil 110 is drastically reduced as compared with the eddy current flowing through the housing, resulting in a decrease in transmission efficiency. doing. However, when comparing the eddy current of the housing and the eddy current of the portion other than the housing, the eddy current of the housing changes significantly, but the change of the eddy current of the portion other than the housing is minute, The change in the eddy current of the housing directly affects the transmission efficiency, and the transmission efficiency is as described above.

  As a result of repeating such experiments, the following effects were obtained. First, as the opening diameter of the opening 150a of the through-hole 150 is increased, the eddy current flowing through the housing decreases. Second, if the opening diameter of the opening 150a of the through hole 150 is determined within a range smaller than the outer diameter (outer width) of the primary coil 510, the current flowing through the secondary coil 110 is kept substantially constant. To be drunk. Based on this, FIG. 9 shows a case where the opening diameter of the opening 250a of the through hole 250 of the electronic timepiece 200 of the present embodiment is set.

  FIG. 9 is an explanatory diagram illustrating configurations of the electronic timepiece 200 and the charging device 500 according to the second embodiment. Here, the configuration and function of charging apparatus 500 are the same as those of charging apparatus in Embodiment 1, and therefore description thereof is omitted. As shown in FIG. 9, the power receiving portion of the electronic timepiece 200 mainly includes a secondary side core 220 having a convex portion 221 near the center and a secondary side coil 210. Here, since the configuration and function of the secondary coil 210 are the same as those of the secondary coil of the first embodiment, the description thereof is omitted.

  The secondary side core 220 is a ferrite core or the like whose main component having magnetic characteristics is formed of a manganese-based metal. When the charging power is charged from the charging device 500, the secondary side core 220 and the primary side core 520 of the charging device Oppositely arranged on the same axis.

  The convex portion 221 is a columnar convex portion provided near the center of the secondary side core 220, and further has a through hole 250 inside the center.

  As shown in FIG. 9, the through-hole 250 has a convex cross-sectional shape in the vertical direction and a circular cross-section in the horizontal direction, and is on the opposite surface side facing the primary core 520 of the charging device 500. The opening area of the opening 250a is different from that of the opening 250b on the surface side that does not face the primary core. That is, in the through hole 250, the opening area of the opening 250a is smaller than the opening area of the opening 250b, the opening diameter of the opening 250a is h3, and the opening diameter of the opening 250b is h2.

  Further, in order to configure the through-hole 250 as an electronic timepiece 200 that can obtain better transmission efficiency, as shown in FIG. 9, the opening 250 a of the through-hole 250 of the secondary-side core 220 is formed on the primary-side coil 510. Is larger than the diameter (outer width) L1 of the convex part 521 near the center of the primary side core 520 or the inner diameter (width of the hollow part) of the primary side coil 510 and the outer diameter of the primary side coil 510. (Outer width) It is desirable to make the range smaller than L2.

  In addition, the shape of the primary side core 520 and the primary side coil 510, the shape of the secondary side core 220 and the secondary side coil 210 are not limited to this Embodiment. However, when these shapes are different from those shown in this embodiment, or when the vertical distance between the charging device 500 (primary side) and the electronic timepiece 200 (secondary side) is different from this embodiment. It is necessary to perform the above-described experiment based on different shapes and distances to obtain an optimum opening diameter 250a.

  As described above, in the electronic timepiece 200 of the second embodiment, in addition to the effects of the first embodiment, the opening 250a of the through hole 250 of the secondary core 220 is formed as a convex portion near the center of the primary core 520. By setting the range to be larger than the diameter L1 of the 521 or the inner diameter of the primary coil 510 and smaller than the outer diameter L2 of the primary coil 510, transmission of charging power from the charging device 500 to the electronic timepiece 200 is efficiently performed. It can be carried out. Further, it is possible to suppress eddy currents that are generated in a casing part directly below the secondary coil 210 and the secondary core 220 (not shown), and to prevent heat generation of the casing due to the eddy currents.

(Modification of Embodiment 2)
Next, an electromagnetic field simulation analysis for the electronic timepiece 200 according to the second embodiment will be described. 10 and 11 are diagrams showing the results of electromagnetic field simulation analysis for the electronic timepiece 200. FIG. In FIG. 10, the opening diameter (opening width) of the opening 250a of the through-hole 250 provided in the secondary core 220 is larger than the diameter (outer width) L1 of the convex portion 521 near the center of the primary core 520, In addition, this is a model (1/2 model) configured to be smaller than the outer diameter (outer width) L2 of the primary coil 510 (when the opening diameter is h3). FIG. 11 shows a model (1/2 model) in which the opening diameter of the opening 250a of the through-hole 250 provided in the secondary core 220 is smaller than the diameter L1 of the convex portion 521 of the primary core 520. (When opening diameter = h1).

  As shown in FIG. 10, the magnetic flux passing through the casing of the electronic timepiece 200 is mainly concentrated immediately above the convex portion 521 of the primary side coil 510, and the passing area is in the vicinity of the location. Limited. On the other hand, as shown in FIG. 11, the magnetic flux passing through the casing of the electronic timepiece 200 is concentrated immediately above the primary side core 520 and the primary side coil 510. The area of the magnetic flux passing through the housing is increased.

  In such electromagnetic field simulation analysis, the amount of magnetic flux interlinking the secondary coil 210 (current flowing through the secondary coil 210) is substantially constant in both the electronic timepieces 200 of FIGS. The eddy current generated in the casing of the electronic timepiece 200 is smaller in FIG. Therefore, a comparison between the two results in that the charging device 500 of FIG. 10 is more efficient in transmitting charging power to the electronic timepiece 200 than the charging device 500 of FIG. That is, the electronic timepiece 200 shown in FIG. 10 is recommended based on the result of the simulation analysis.

  In such a configuration, the amount of magnetic flux generated from the primary core 520 and the primary coil 510 of the charging device 500 is substantially the same in FIGS. 10 and 11 because the configuration of the charging device 500 is the same. It has become. Further, since the magnetic flux linked to the secondary coil 210 is also substantially constant, the only difference between them is the eddy current flowing in the casing of the electronic timepiece 200. Accordingly, in the through hole 250, the opening diameter of the opening 250 a is such that the area of the magnetic flux generated in the primary side coil 510 and passing through the casing of the electronic timepiece 200 is extremely large than the magnetic flux passing through the secondary side core 220. It is desirable to increase the width up to the maximum width that will not be reduced.

  For example, referring to FIG. 8, the opening diameter of the opening 250a in FIG. 10 is h3 (horizontal axis) in FIG. 8, and the opening diameter of the opening 250a in FIG. 11 is h1 (horizontal) in FIG. Axis). In the range of the opening diameter from h1 to h3, the current obtained in the secondary coil 210 is substantially constant, whereas the eddy current flowing through the secondary core 220 has an opening diameter from h1 to h3. As it becomes, it decreases. That is, the transmission efficiency to the secondary side is improved as the opening diameter is changed from h1 to h3. Although not shown, when the opening diameter of the opening 250a is smaller than h1 or when the opening 250a is not provided, the eddy current (current loss) flowing through the housing increases linearly. Since the current flowing through the secondary coil 210 is substantially constant, the transmission efficiency is worse than when the opening diameter of the opening 250a is h1. That is, when the opening diameter is h3, which is the maximum width of the opening diameter in a range where the current flowing through the secondary coil 210 does not become extremely small, it is desirable that the opening diameter of the opening 250a is h3.

  Further, regarding the difference in eddy currents in the housing of the electronic timepiece 200 of FIGS. 10 and 11, the magnetic flux corresponding to the difference in the electronic timepiece 200 of FIG. 10 is released into the air. That is, in the electronic timepiece 200 of FIG. 10, the magnetic flux corresponding to the difference between the eddy currents is released into the air, so that the eddy current generated in the housing of the electronic timepiece 200 can be suppressed accordingly. The heat generation of the housing due to the eddy current can be prevented.

(Embodiment 3)
In the electronic timepiece of the present embodiment, the opening diameter (opening width) of the opening on the side that does not face the charging device in the through hole provided in the secondary side core is outside the secondary battery provided inside the electronic timepiece. The length is substantially the same as the diameter (outer width).

  FIG. 12 is an explanatory diagram illustrating configurations of the electronic timepiece 300 and the charging device 500 according to the third embodiment. Here, the configuration and function of charging apparatus 500 are the same as those of charging apparatus in Embodiment 1, and therefore description thereof is omitted. As shown in FIG. 12, the power receiving portion of the electronic timepiece 300 mainly includes a secondary side core 320 having a convex portion 321 near the center, a secondary side coil 310, and the secondary battery 10. Here, the configuration and function of the secondary side coil 310 are the same as those of the secondary side coil of the first embodiment, and thus the description thereof is omitted.

  The secondary battery 10 accumulates the charging power received from the charging device 500.

  The secondary side core 320 is a ferrite core or the like whose main component having magnetic properties is formed of a manganese-based metal. When the charging power is charged from the charging device 500, the secondary side core 320 and the primary side core 520 of the charging device Oppositely arranged on the same axis.

  The convex portion 321 is a columnar convex portion provided near the center of the secondary side core 320, and further has a through hole 350 inside the center.

  As shown in FIG. 12, the through-hole 350 has a convex cross-sectional shape in the vertical direction and a circular cross-section in the horizontal direction, and is on the opposite surface side facing the primary core 520 of the charging device 500. The opening areas of the opening 350a and the opening 350b on the surface side that does not face the primary core are different. That is, in the through hole 350, the opening area of the opening 350a is smaller than the opening area of the opening 350b, the opening diameter of the opening 350b is h3, and the opening diameter of the opening 350b is W1. In addition, the through hole 350 is formed such that the opening diameter W1 of the opening 350b is substantially the same as or slightly larger than the outer diameter W2 of the secondary battery 10, and the through hole 350 is formed in the through hole of the secondary core 320. Thus, the secondary battery 10 can be placed in the space formed.

  As described above, in the electronic timepiece 300 according to the third embodiment, the opening diameter W1 of the opening 350b of the through hole 350 is formed to be substantially the same length as the outer diameter W2 of the secondary battery 10 or slightly larger. Thus, the secondary battery 10 can be arranged in the space formed in the through hole of the secondary core 320. Therefore, it is not necessary to provide a space for arranging the secondary core 320 and the secondary battery 10 inside the electronic timepiece 300, and the electronic timepiece 300 can be thinned. Furthermore, since the secondary battery 10 can be accommodated in the secondary core 320, the secondary core 320 can protect components such as the secondary battery 10, and so on. It can serve as a protective part for important parts.

  The electronic timepiece 300 according to the present embodiment is configured such that the opening diameter of the opening 150b of the through hole 350 of the secondary core 320 is substantially the same as or slightly larger than the outer diameter of the secondary battery 10. When the component housed in the secondary core 320 is not a secondary battery but includes another electronic component or a substrate, the opening diameter of the opening 150b of the through hole 350 is set to the outer diameter of the electronic component or the like. By matching with the diameter, it can similarly serve as a thin part and a protective part.

(Embodiment 4)
In the electronic timepiece of the present embodiment, the thickness of the through hole provided in the secondary side core that does not face the charging device is substantially the same as the thickness of the secondary battery provided in the electronic timepiece. It is a thing.

  FIG. 13 is an explanatory diagram illustrating configurations of the electronic timepiece 400 and the charging device 500 according to the fourth embodiment. Here, the configuration and function of charging apparatus 500 are the same as those of charging apparatus in Embodiment 1, and therefore description thereof is omitted. As shown in FIG. 13, the power receiving portion of the electronic timepiece 400 mainly includes a secondary side core 420 having a convex portion 421 near the center, a secondary side coil 410, and the secondary battery 10. Here, the configuration and function of the secondary side coil 410 are the same as those of the secondary side coil of the first embodiment, and thus the description thereof is omitted.

  The secondary battery 10 accumulates the charging power received from the charging device 500.

  The secondary side core 420 is a ferrite core or the like whose main component having magnetic properties is formed of a manganese-based metal, and the primary side core 520 of the charging device 500 is charged when charging power is charged from the charging device 500. Are arranged on the same axis and facing each other.

  The convex portion 421 is a columnar convex portion provided near the center of the secondary side core 420, and further has a through hole 450 inside the center.

  As shown in FIG. 13, the through-hole 450 has a convex cross-sectional shape in the vertical direction and a circular cross-section in the horizontal direction, and is on the opposite surface side facing the primary core 520 of the charging device 500. The opening area of the opening 450a is different from that of the opening 450b on the surface side not facing the primary core. That is, in the through hole 450, the opening area of the opening 450a is smaller than the opening area of the opening 450b, and the opening diameter (opening width) of the opening 450a is h3. In addition, the through hole 450 has a thickness T 1 on the opening 450 b side that is substantially the same as the thickness T 2 of the secondary battery 10, and is provided inside the through hole 450 of the secondary core 420. The secondary battery 10 can be placed in the space.

  As described above, in the electronic timepiece 400 according to the fourth embodiment, the thickness T1 on the opening 450b side of the through hole 450 is formed to be substantially the same as the thickness T2 of the secondary battery 10, thereby A secondary battery or the like can be arranged in the space formed on the side of the opening 450b of the 450 with almost no gap. Accordingly, it is easy to arrange a secondary battery or the like (an electronic component such as a substrate, an electronic circuit, or a module) disposed above the secondary core 420, and to keep the parallelism of the components inside the electronic timepiece 400. .

  Although the convex part of the secondary side core in this Embodiment is provided in the column shape near the center of the secondary side core, it is not limited to this. That is, it may be provided in any shape as long as the coil can be wound, for example, it may be formed in a prismatic shape, a horizontal cross section in the shape of a quadrangle, a semicircle, etc. It may not be formed symmetrically. In addition, the secondary core in the present embodiment is formed of a manganese-based ferrite core or the like, but the secondary core is formed by arbitrarily combining members formed of other materials. A coil may be wound around.

  Further, the through hole in the present embodiment has a circular cross section in the horizontal direction, but is not limited thereto. That is, as long as it is a through-hole, other shapes may be used. For example, the horizontal cross section may be formed in a shape such as a quadrangle or a semicircle, and may not be formed symmetrically.

2 is an explanatory diagram showing configurations of an electronic timepiece 100 and a charging device 500 according to a first embodiment. FIG. It is explanatory drawing which shows the structure of the charging device 500 and the electronic timepiece 700 of a prior art. 6 is a graph showing the relationship between the current value of the current flowing through the secondary coil 710 and the opening diameter (opening width) of the through hole 750 of the secondary core 720. It is a figure which shows the structure of the electronic timepiece 700 of the prior art at the time of expanding the opening diameter of the through-hole 750 to h3. It is a figure which shows the structure of the electronic timepiece 700 of the prior art at the time of expanding the opening diameter of the through-hole 750 to h2. FIG. 3 is a diagram showing a configuration of the electronic timepiece 100 according to the first embodiment when the opening diameter of the opening 150a of the through hole 150 is widened to h3. FIG. 3 is a diagram showing a configuration of the electronic timepiece 100 according to the first embodiment when the opening diameter of the opening 150a of the through hole 150 is widened to h2. 5 is a graph showing the relationship between the current value of the current flowing through the electronic timepiece 100 and the opening diameter of the opening 150a of the through hole 150 of the secondary core 120. FIG. 6 is an explanatory diagram illustrating configurations of an electronic timepiece 200 and a charging device 500 according to a second embodiment. It is a figure which shows the result of the electromagnetic field simulation analysis with respect to the electronic timepiece. It is a figure which shows the result of the electromagnetic field simulation analysis with respect to the electronic timepiece. FIG. 6 is an explanatory diagram showing configurations of an electronic timepiece 300 and a charging device 500 according to a third embodiment. FIG. 6 is an explanatory diagram illustrating configurations of an electronic timepiece 400 and a charging device 500 according to a fourth embodiment. 10 is a cross-sectional view illustrating a primary coil 530 of a power supply device 550 and a secondary coil 620 of an electronic device 600 in Patent Document 1. FIG. 6 is a cross-sectional view illustrating a primary coil 510 and a secondary coil 710 of a contactless electromagnetic induction charging mechanism in Patent Document 2. FIG.

Explanation of symbols

10 Secondary battery 100, 200, 300, 400 Electronic timepiece 110, 210, 310, 410 Secondary side coil 120, 220, 320, 420 Secondary side core 121, 221, 321, 421 Convex part 121a collar part 150, 250 , 350, 450 Through hole 150a, 250a, 350a, 450a, 150b, 250b, 350b, 450b Opening 500 Charging device 510 Primary coil 520 Primary core

Claims (8)

In a non-contact transfer device that transfers charging power or information in a non-contact manner from a non-contact transmission device having a transmission-side core wound with a transmission-side coil.
A transfer side core that has a convex portion near the center and is disposed substantially coaxially with the transmission side core when the charging power or information is transferred from the non-contact transmission device;
A receiving and receiving side coil wound around the convex part ;
With
The delivery side core has a through hole,
The through hole is different in opening area or opening width between the first opening on the facing surface side of the transmission side core and the second opening on the surface side not facing the transmission side core,
The width of the hollow portion of the delivery side coil is larger than the width of the first opening and the width of the second opening,
The transfer side coil receives and transfers the charging power or information from the non-contact transmission device by detecting the magnetic flux generated by the transmission side coil and the transmission side core and generating an induced electromotive force. A non-contact transfer device.   2. The non-contact transfer device according to claim 1, wherein the through hole has a convex cross-sectional shape, and an opening area of the first opening is smaller than an opening area of the second opening.   3. The non-contact transfer device according to claim 1, wherein an opening width of the second opening is wider than an opening width of the first opening.   In the through hole, the opening width of the first opening portion is either the outer width of the convex portion near the center of the transmission side core around which the transmission side coil is wound or the width of the hollow portion of the transmission side coil. The contactless transmission / reception apparatus according to claim 1, wherein the contactless transmission / reception apparatus is larger than one and smaller than an outer width of the transmission-side coil.   In the through hole, the opening width of the first opening is generated in the transmission side coil, and the area of the magnetic flux when passing through the housing of the non-contact transfer device is extremely high in the magnetic flux passing through the transfer side core. The non-contact transfer device according to claim 4, wherein the non-contact transfer device is widened with a maximum width which is a range not to be reduced. A power storage unit for storing the charging power or information;
6. The contactless transmission / reception according to claim 1, wherein an opening width of the second opening portion is substantially the same as an outer width of the power storage portion. apparatus.   The contactless transmission / reception apparatus according to claim 6, wherein a thickness of the through hole is substantially the same as a thickness of the power storage unit. In the sending / receiving core that sends and receives the charging power or information from the contactless transmission device by detecting the magnetic flux generated by the transmission side coil and the transmission side core in the contactless transmission device and generating an induced electromotive force,
The transfer side core has a convex portion and a through hole in the vicinity of the center, and when the charging power or information is transferred from the non-contact transmission device, is disposed substantially coaxially with the transmission side core,
The through hole is different in opening area or opening width between the first opening on the opposite side of the transmission side core and the second opening on the side not facing the transmission side core ,
The delivery-side core characterized in that the width of the hollow portion of the delivery-side coil is larger than the width of the first opening and the width of the second opening .

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