JP2012005189A - Charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charger 10 which easily charges a secondary battery incorporated in electronic glasses 20.SOLUTION: A charger 10 supplies electric power to electric glasses 20 having a built-in secondary battery. The charger 10 includes a power transmitting coil 17 supplying electric power to power receiving coils 27 provided at the electric glasses 20 in a non-contact manner, and positioning means 11 and 12 for placing the electronic glasses 20 at a predetermined position. The power transmitting coil 17 is wound around a first elongated core 18 and the power receiving coils 27 are respectively wound around second elongated cores 28.

Description

  The present invention relates to a charging device that supplies electric power to electronic glasses with a built-in secondary battery.

  As electronic glasses that require power, electronic glasses that electrically change the focal length, electronic glasses for video with a built-in display, electronic glasses with a built-in music player, electronic glasses with variable light transmittance, left and right shutters There are liquid crystal shutter glasses that realize stereoscopic viewing by alternately viewing the left eye image and the right eye image by opening and closing.

  Since such electronic glasses are required to be used without a power cable and without a power cable, a primary battery or a secondary battery is generally used as a power source. When a primary battery is used as a power source, there is a problem that battery replacement due to battery consumption is necessary, which is inconvenient for the user. Therefore, it is preferable to use a rechargeable secondary battery for the electronic glasses.

  When a secondary battery is used as the power source of the electronic glasses, a metal terminal for connecting to an external power source is required. When charging a secondary battery, it is necessary to connect a charging device and a metal terminal. If moisture or dust such as sweat adheres to this metal terminal, there is a risk of short circuit. Moreover, there is a possibility that charging cannot be performed due to deterioration of the terminal or insufficient contact.

  On the other hand, in an electronic device such as an electronic camera, as a charging method for charging a secondary battery, a method of supplying power to the secondary battery using electromagnetic induction has been proposed. Thereby, it becomes possible to charge a secondary battery, without using a metal terminal. In order to supply power to the secondary battery using the electromagnetic induction effect, a power receiving coil for generating an electromotive force by a fluctuating magnetic field is required. The charging device is provided with a power transmission coil for generating a varying magnetic field. As the power receiving coil, a flat planar coil is used in order to realize a reduction in thickness and size. In addition, the power transmission coil having the same diameter as the power reception coil is used.

JP 2007-052116 A JP 2003-125252 A

  When charging the secondary battery built in the electronic glasses, it is necessary for the charging device and the metal terminal to be connected, which is troublesome for the user. Moreover, if it is going to apply the system which supplies an electric power to a secondary battery using an electromagnetic induction effect to electronic glasses with little space, it is necessary to make the diameter of a planar coil small. However, in this case, the power receiving capability of the power receiving coil is reduced.

  The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a charging device that can easily charge a secondary battery built in electronic glasses. It is another object of the present invention to provide a charging device that can efficiently perform non-contact power transmission without reducing transmission power with respect to electronic glasses including a power receiving coil.

  In order to achieve such an object, the present invention provides a charging device that supplies electric power to electronic glasses with a built-in secondary battery, and supplies electric power to a power receiving coil provided in the electronic glasses in a contactless manner. A power transmission coil and positioning means for placing the electronic glasses at a predetermined position, wherein the power transmission coil is wound around the first core, and the power reception coil is wound around the second core. Features.

  According to the present invention, the secondary battery built in the electronic glasses can be easily charged. In addition, power transmission can be efficiently performed in a non-contact manner without reducing transmission power with respect to the electronic glasses including the power receiving coil.

The perspective view of the state which mounted electronic glasses on the charging device which concerns on the 1st Embodiment of this invention. The figure which shows the positional relationship of the power transmission coil and power receiving coil which concern on the 1st Embodiment of this invention. The block diagram of the charging device and electronic glasses which concern on the 1st Embodiment of this invention 1 is a circuit diagram of a charging device and electronic glasses according to a first embodiment of the present invention. The perspective view of the state which mounted the electronic glasses on the charging device which concerns on the 2nd Embodiment of this invention. The figure which shows the positional relationship of the power transmission coil and power receiving coil which concern on the 2nd Embodiment of this invention. The perspective view of the charging device which concerns on the 3rd Embodiment of this invention. The block diagram of the charging device which concerns on the 3rd Embodiment of this invention. Sectional drawing of the charging device which concerns on the 3rd Embodiment of this invention.

(First embodiment)
A charging device and electronic glasses according to a first embodiment of the present invention will be described. FIG. 1 is a perspective view of a state where electronic glasses are placed on the charging device according to the first embodiment of the present invention. In this embodiment, 3D glasses are used as an example of electronic glasses. The 3D glasses 20 are placed on the charging device 10 in a folded state.

  The charging device 10 includes a temple support portion 11, a front support portion 12, and a power transmission coil 17 for generating a fluctuating magnetic field. When the 3D glasses 20 are placed on the charging device 10, the 3D glasses 20 are stably held at a predetermined position by the temple support portion 11 and the front support portion 12.

  The 3D glasses 20 are composed of left and right temples 21 and a front 22. The front 22 includes left and right rims 23, a bridge 24, left and right nose pads 25, and left and right shutters 26. A power receiving coil 27 is provided in each of the left and right rims 23. Each of the power receiving coils 27 is disposed at a symmetrical position with respect to the center (bridge 24) of the 3D glasses 20. When the 3D glasses 20 are placed on the charging device 10, the power receiving coil 27 and the power transmitting coil 17 are arranged so as to be in an electromagnetically connectable state.

  As shown in FIG. 1, the temple support 11 is formed in a groove shape. The left and right temples 21 are supported by the groove-like temple support portion 11 in an overlapped state. By supporting the left and right temples 21 along the side surface and the bottom surface of the groove, positioning can be performed in the respective surface directions. Further, the front support portion 12 is formed in a shape protruding in the vertical direction along the shape of the left and right nose pads 25 and protruding in one horizontal direction. In other words, the front support portion 12 is formed so as to gradually spread in the horizontal direction from the top to the bottom. The left and right nose pads 25 are supported by the front support unit 12 where the width of the front support unit 12 is equal to the distance between the left and right nose pads 25. Positioning can be performed in the vertical direction and the direction between the left and right nose pads 25 by the front support portion 12 having such a shape. Thus, the charging device 10 can place the 3D glasses 20 in a stable state at a predetermined position by the temple support portion 11 and the front support portion 12.

  It is desirable to make the charging device 10 as small as possible. As illustrated in FIG. 1, the temple support 11 is configured such that the 3D glasses 20 are folded and the left and right temples 21 are supported in an overlapped state. The front support 12 is configured to support the left and right nose pads 25 or the bridge 24 and the left and right rims 23 near the bridge 24. Thereby, the temple support part 11 and the front support part 12 can be comprised in the near place, and the charging device 10 can be reduced in size. At this time, the power receiving coil 27 is preferably disposed on the rim 23 close to the nose pad 25. In addition, since the 3D glasses 20 are symmetrical with respect to the temple support portion 11 and the front support portion 12, the 3D glasses 20 can be supported in a balanced manner.

  Next, the configuration of the power transmission coil 17 and the power reception coil 27 according to the first embodiment of the present invention will be described. FIG. 2 is a diagram illustrating a positional relationship between the power transmission coil 17 and the power reception coil 27 when the 3D glasses 20 are placed on the charging device 10 according to the first embodiment of the present invention.

  First, the configuration of the power transmission coil 17 and the power reception coil 27 will be described. The power transmission coil 17 is wound around the outer periphery of a substantially flat core 18 made of a magnetic material. Similarly, the power receiving coil 27 is wound around the outer periphery of a substantially rod-shaped core 28 made of a magnetic material.

  Next, the positional relationship between the power transmission coil 17 and the power reception coil 27 will be described. When the 3D glasses 20 are placed on the charging device 10, the power transmission coil 17 and the power reception coil 27 are arranged so that the longitudinal directions of the cores 18 and 28 face each other substantially in parallel. An induced electromotive force is generated in the power receiving coil 27 by electromagnetic induction by the magnetic flux 30 induced from the power transmitting coil 17.

  The cross-sectional shape in the longitudinal direction of the cores 18 and 28 is formed so as to be a long and narrow rectangle. The cross-sectional shape in the direction perpendicular to the longitudinal direction may be a substantially rectangular shape or a substantially oval shape. Further, a magnetic sheet may be used as the cores 18 and 28. For example, a power transmission coil 17 or a power reception coil 27 may be formed by winding a polyurethane wire around a magnetic sheet. Depending on where the power transmission coil 17 and the power reception coil 27 are disposed, a rod-shaped core, a flat core, or the like can be selected as appropriate.

  When a core having a rectangular or oval cross-sectional shape perpendicular to the longitudinal direction of the core is used as one core, the other core is arranged in a direction facing the long side instead of the short side of the cross section. Thereby, the efficiency fall with respect to the position shift of a long side direction can be suppressed.

  The space for placing the power receiving coil 27 is limited due to the shape of the 3D glasses 20. For this reason, if a planar coil is used as the power receiving coil 27, the diameter must be reduced, and the power receiving capability is reduced. By configuring the power transmission coil 17 and the power reception coil 27 as described above, it is possible to suppress a decrease in power reception capability. Further, as in this embodiment, the power transmission coil 17 and the power reception coil 27 are wound around the elongated core 18 and the core 28 having substantially the same length, thereby suppressing a decrease in efficiency between power transmission and reception. be able to.

  Further, the left and right rims 23 of the electronic glasses 20 do not have a space in which a printed circuit board can be built. For this reason, the power supply circuit, the control circuit for synchronizing the left and right shutters 26 with the images for the left eye and the right eye, the infrared light receiving element, and the like cannot be arranged in this portion, and the space can be used effectively. could not. By winding the power receiving coil 27 around the elongated core 28, it is possible to arrange the power receiving coil 27 on the left and right rims 23, and the 3D glasses 20 can be downsized.

  Next, configurations of the charging device 10 and the 3D glasses 20 according to the first embodiment of the present invention will be described. FIG. 3 is a block diagram of the charging device 10 and the 3D glasses 20 according to the first embodiment of the present invention. The charging device 10 includes a drive circuit 40 and a power transmission coil 17 that are supplied with power from a power source. The 3D glasses 20 include a power receiving coil 27 that receives power from the power transmitting coil 17 by electromagnetic induction, and a rectifying and smoothing circuit 41 that rectifies AC power induced in the power receiving coil 27. The output of the rectifying / smoothing circuit 41 is supplied to the secondary battery via the charge control circuit.

  A separate drive circuit 40 is connected to each power transmission coil 17. Each drive circuit 40 converts the DC power Vin supplied from the power source into AC power and supplies the AC power to each power transmission coil 17. As a result, an induction magnetic field is generated in the power transmission coil 17, and the magnetic flux 30 linked to the power reception coil 27 is changed by the induction magnetic field, and an electromotive force is generated in the power reception coil 27 due to electromagnetic induction. Each rectifying / smoothing circuit 41 converts the electromotive force generated in each power receiving coil 27 into DC power. The output terminals of each rectifying / smoothing circuit 41 are connected to each other, and the combined output Vout of each rectifying / smoothing circuit 41 is supplied to the secondary battery via the charge control circuit.

  Next, specific circuit configurations of the charging device 10 and the 3D glasses 20 according to the first embodiment of the present invention will be described. FIG. 4 is a circuit diagram of an embodiment of the block diagram shown in FIG. As the drive circuit 40, a self-excited oscillation circuit is applied. The charging apparatus 10 includes a feedback coil 42 for self-excited oscillation in addition to the power transmission coil 17. The power transmission coil 17 and the feedback coil 42 are magnetically coupled to each other. The charging coil 10 can be reduced in size by winding the feedback coil 42 around the same core 18 as the power transmission coil 17. For example, the feedback coil 42 is wound inside the power transmission coil 17.

  In FIG. 4, a collector-tuned self-excited oscillation circuit is used as the drive circuit 40. However, a self-excited oscillation circuit such as an RCC resonance type circuit or a collector resonance type may be used. Further, as the drive circuit 40, a separately excited half bridge circuit, a full bridge circuit, or the like may be used.

  As described above, according to the present embodiment, the secondary battery built in the electronic glasses can be easily charged simply by placing the electronic glasses such as the 3D glasses 20 on the charging device 10. Further, power transmission can be performed in a non-contact manner with respect to the electronic glasses including the power receiving coil 27 without lowering the transmission power.

  In the present embodiment, a plurality of power transmission coils 17 and power reception coils 27 are used, but the present invention is not limited thereto. For example, one power transmission coil 17 may transmit power to one power receiving coil 27. In addition, power may be transmitted to the plurality of power receiving coils 27 by the single power transmission coil 17, or power may be transmitted to the single power receiving coil 27 by the plurality of power transmission coils 17. In the case where a plurality of power receiving coils 27 are used, it is possible to prevent the balance between the left and right weights from being deteriorated by arranging the power receiving coils 27 at positions symmetrical to the center of the 3D glasses 20 (bridge 24).

  Further, in the present embodiment, the left and right nose pads 25 are supported by the front support portion 12, but the alignment may be performed by supporting the left and right rims 23 and the bridge 24. Further, as the positioning means, the temple support portion 11 formed in a groove shape and the front support portion 12 raised in the horizontal direction and the vertical direction are exemplified, but the positioning means is not limited thereto. For example, at least a part of the front 22 may be supported by the front support portion 12 formed in a groove shape. In addition to forming the temple support portion 11 in a groove shape, the temple support portion 11 may be configured as a U-shaped or V-shaped notch. Further, a plurality of temple support portions 11 that respectively hold the left and right temples 21 may be provided so that the 3D glasses 20 are placed on the charging device 10 in a state where the 3D glasses 20 are not folded.

  Further, although the power receiving coil 27 is provided inside the left and right rims 23 of the 3D glasses 20, the present invention is not limited thereto. For example, the power receiving coil 27 may be provided inside the bridge 24 or the temple 21 of the 3D glasses 20. Further, the power receiving coil 27 may be incorporated in any location of the 3D glasses 20. When the 3D glasses 20 are placed at a predetermined position of the charging device 10, the power transmission coil 17 is disposed to face the power reception coil 27 so that the longitudinal directions of the coils are substantially parallel.

(Second Embodiment)
A charging device and electronic glasses according to a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the site | part which has the same function as 1st Embodiment, and description is abbreviate | omitted. This embodiment is different from the first embodiment in the configuration and arrangement of the power transmission coil and the power reception coil.

  FIG. 5 is a perspective view of the charging apparatus 10 according to the second embodiment of the present invention. The charging device 10 includes a power transmission coil 17 ', and the power transmission coil 17' is wound around a substantially cylindrical core 18 'made of a magnetic material.

  The 3D glasses 20 include a power receiving coil 27 ′, and the power receiving coil 27 ′ is provided inside the bridge 24. The power receiving coil 27 ′ is wound around a substantially cylindrical core 28 ′ made of a magnetic material. The power receiving coil 27 ′ is disposed at the approximate center of the bridge 24.

  Next, the positional relationship between the power transmission coil 17 'and the power reception coil 27' will be described. FIG. 6 is a diagram illustrating a positional relationship between the power transmission coil 17 ′ and the power reception coil 27 ′ when the 3D glasses 20 are placed on the charging device 10 according to the second embodiment of the present invention.

  When the 3D glasses 20 are placed on the charging device 10, the power transmission coil 17 ′ and the power reception coil 27 ′ are arranged so that their winding axes substantially coincide with each other. An induced electromotive force is generated in the power receiving coil 27 ′ by electromagnetic induction by the magnetic flux 30 induced from the power transmitting coil 17 ′. When the power receiving coil 27 ′ is provided in the bridge 24 as in this embodiment, the core 18 ′ of the power transmitting coil 17 ′ and the core 28 ′ of the power receiving coil 27 ′ can be arranged to face each other. When a plurality of power receiving coils 27 ′ are not used, the 3D glasses 20 can be supported on the charging device 10 in a balanced manner by providing the power receiving coils 27 ′ in the bridge 24.

  In this embodiment, instead of using the core 18 ′ and the core 28 ′, a magnetic sheet may be attached to one or each of the surfaces opposite to the surfaces where the power transmitting coil 17 ′ and the power receiving coil 27 ′ are opposed to each other. . A magnetic sheet having a size equal to or larger than the diameter of the power transmission coil 17 'and the power reception coil 27' is used. Thereby, an induction coefficient can be raised and the magnetic coupling between power transmission coil 17 'and power reception coil 27' can be improved. With such a configuration, even if the diameter of the power receiving coil 27 ′ is reduced, it is possible to compensate for a decrease in the power receiving capability of the power receiving coil 27 ′.

(Third embodiment)
Next, a charging device according to a third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the site | part which has the same function as 1st Embodiment, and description is abbreviate | omitted. Moreover, since the configuration and operation of the electronic glasses placed on the charging device are the same as those in the first embodiment, description thereof is omitted.

  FIG. 7 is a perspective view of the charging apparatus 10 according to the third embodiment of the present invention. The charging device 10 includes a lower housing 50 and an upper housing 51, and the power transmission coil 17, the temple support portion 11, and the front support portion 12 are provided in the upper housing 51. The upper casing 51 is rotatably connected to the lower casing 50.

  FIG. 7B is a diagram illustrating a state where the upper casing 51 of FIG. 7A is rotated by 90 ° with respect to the lower casing 50. The upper casing 51 is rotatable with respect to the lower casing 50 in the horizontal direction with the vertical direction as the central axis. Therefore, the direction of the front support part 12 and the temple support part 11 can be adjusted to an arbitrary direction with the lower housing 50 fixed.

  When placing the 3D glasses 20 on the charging device 10, the 3D glasses 20 had to be set in accordance with the orientation of the charging device 10. When the charging device 10 is connected to a power cable or fixed at a predetermined place, it is difficult to change the direction of the charging device 10. Therefore, there is a problem that it is difficult to place the 3D glasses 20 on the charging device 10 depending on the orientation of the charging device 10. As described above, positioning means for the 3D glasses 20 is provided in the upper casing 51 of the charging apparatus 10 so that the upper casing 51 can rotate with respect to the lower casing 50. Accordingly, the user can easily place or remove the 3D glasses 20 from any direction with respect to the charging device 10, and convenience can be improved.

  Next, the structure of the charging device 10 which concerns on the 3rd Embodiment of this invention is demonstrated. FIG. 8 is a block diagram of the charging apparatus 10 according to the third embodiment of the present invention. The lower housing 50 includes a drive circuit 40 and a power transmission coil 52 that are supplied with power from a power source. The upper casing 51 is supplied with a power receiving coil 53 that receives power from the power transmitting coil 52 by electromagnetic induction, a rectifying / smoothing circuit 41 that rectifies AC power induced in the power receiving coil 53, and an output of the rectifying / smoothing circuit 41. Drive circuit 40 and power transmission coil 17.

  The drive circuit 40 in the lower casing 50 converts the DC power Vin supplied from the power source into AC power and supplies the AC power to the power transmission coil 52. As a result, an induction magnetic field is generated in the power transmission coil 52, the magnetic flux 30 interlinked with the power reception coil 53 is changed by the induction magnetic field, and an electromotive force is generated in the power reception coil 53 by electromagnetic induction. The rectifying / smoothing circuit 41 converts the electromotive force generated in the power receiving coil 53 into DC power, and supplies the DC power to each drive circuit 40 in the upper casing 51. The output of each drive circuit 40 is supplied to each power transmission coil 17.

  Next, a power transmission coil 52 and a power reception coil 53 according to the third embodiment of the present invention will be described. FIG. 7 is a cross-sectional view of the charging apparatus 10 according to the third embodiment of the present invention. Each of the power transmission coil 52 and the power reception coil 53 is a circular planar coil. The central axis of the power transmission coil 52 and the power reception coil 53 and the rotation axis of the upper housing 51 are arranged so as to substantially coincide. Thereby, when the upper housing | casing 51 is rotated, the center axis | shaft of the power transmission coil 52 and the receiving coil 53 does not shift | deviate, and the fall of the efficiency by the position shift between the power transmission coil 52 and the receiving coil 53 can be prevented. Thus, the structure which performs non-contact electric power transmission between plane coils is suitable between the lower housing | casing 50 and the upper housing | casing 51 currently supported with respect to the lower housing | casing 50 so that rotation is possible.

  As an electrical connection method between the lower housing 50 and the upper housing 51, contacts such as electrodes or cables may be used. Thus, by transmitting power in a non-contact manner, the lower housing 50 and the upper housing 51 are connected. Restrictions due to poor contact or rotation between the bodies 51 can be eliminated.

  As described above, the upper housing 51 of the charging device 10 is configured to be rotatably supported with respect to the lower housing 50. And a non-contact power transmission circuit is comprised in two places between the lower housing | casing 50 and the upper housing | casing 51 and between the upper housing | casing 51 and 3D glasses 20, respectively. Between the lower housing | casing 50 and the upper housing | casing 51, non-contact electric power transmission is performed by plane coils. Further, between the upper housing 51 and the 3D glasses 20, non-contact power transmission is performed between coils wound around an elongated core. In this way, a two-stage non-contact power transmission circuit is configured, and power transmission is performed using the power transmission coils 17 and 52 and the power reception coils 27 and 53 each having a suitable shape in each stage.

  Accordingly, not only can the 3D glasses 20 be simply charged by simply placing the 3D glasses 20 on the charging device 10, but also the 3D glasses 20 can be easily placed on the charging device 10 and convenience can be improved. .

DESCRIPTION OF SYMBOLS 10 Charging device 11 Temple support part 12 Front support part 17, 27 'Power transmission coil 18, 18' Core 20 3D glasses 21 Temple 22 Front 23 Rim 24 Bridge 25 Nose pad 26 Shutter 27, 27 'Power reception coil 28, 28' Core 30 Magnetic flux 40 Drive circuit 41 Rectification smoothing circuit 42 Feedback coil 50 Lower casing 51 Upper casing 52 Power transmission coil 53 Power reception coil

Claims (9)

In a charging device that supplies power to electronic glasses with a built-in secondary battery,
A power transmission coil that supplies power in a non-contact manner to a power reception coil provided in the electronic glasses;
A positioning means for placing the electronic glasses at a predetermined position;
The charging device, wherein the power transmission coil is wound around a first core, and the power receiving coil is wound around a second core.   The charging device according to claim 1, wherein the positioning unit includes a temple support portion that supports a temple of the electronic glasses and a front support portion that supports the front of the electronic glasses.   3. The charging device according to claim 1, wherein the first core and the second core have an elongated shape. 4.   4. The charging device according to claim 3, wherein the power receiving coil is built in a rim of the electronic glasses.   4. The charging device according to claim 3, wherein the power receiving coil is built in a temple of the electronic glasses.   The charging device according to claim 3, wherein the power receiving coil is built in a bridge of the electronic glasses.   3. The charging device according to claim 1, wherein the first core and the second core have a substantially cylindrical shape, and the power receiving coil is built in a bridge portion of the electronic glasses. apparatus.   The charging device according to any one of claims 1 to 7, wherein the charging device includes an upper housing and a lower housing, and the upper housing includes the power transmission coil and the positioning means. A charging device characterized in that a body is rotatably connected to the lower housing.   9. The charging device according to claim 8, wherein the lower housing includes a first planar coil, the upper housing further includes a second planar coil that transmits power from the first planar coil in a contactless manner, and A charging device comprising: a rectifier circuit that rectifies AC power generated in a second planar coil; and a drive circuit that converts an output voltage of the rectifier circuit into AC power and supplies the AC power to the power transmission coil.

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