TW201703544A - Driving device and portable device equipped with same - Google Patents

Abstract

This driving device which is provided to an apparatus body including a secondary battery and to which electric power charged in the secondary battery is supplied comprises: a driving mechanism which operates using the electric power charged in the secondary battery; and a circuit board having a charging circuit which controls charging the secondary battery.

Description

Drive device and portable machine therewith

The present invention relates to a driving device that is actuated by charging electric power to a secondary battery, and a portable machine having the same.

In the prior art, a headphone of Patent Document 1 can be exemplified as a device that operates by charging electric power to a secondary battery. The headphone is configured to house a socket for a secondary battery or a charging mini USB connector, a microphone, and a printed circuit board in a casing, and to provide an earphone microphone outside the casing.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-023848

Then, the headphone is desirably capable of easily changing the size or pattern of the casing due to the capacity or fashion tendency of the secondary battery or the like. Further, such a desire is not limited to the headphone, but is present in all the devices in which the headphone microphone is provided in the casing having the secondary battery, and the portable machine having a small casing volume is particularly remarkable.

Accordingly, it is an object of the present invention to provide a drive device and a portable machine having the same that can be expanded in design when the size or style is determined.

A first aspect of the invention is a driving device provided in a device body including a secondary battery. Further, electric power for charging the secondary battery is supplied, and a drive mechanism that operates by charging electric power to the secondary battery and a power receiving mechanism that receives electric power for charging the secondary battery are provided.

According to the above configuration, by providing the power receiving mechanism that receives the electric power charged to the secondary battery to the driving device, it is not necessary to secure the arrangement place for the power receiving mechanism in the device body. Thereby, the degree of freedom in design of the device body can be expanded in the case of determining the size or style.

According to a second aspect of the invention, the drive mechanism includes a magnet and a yoke that form a magnetic circuit, and the yoke is disposed between the power receiving mechanism and the magnet, and the power receiving mechanism generates power by wireless power supply. The power receiving coil.

According to the above configuration, the magnetic field generated when the power is generated by the power receiving coil flows through the yoke, and the magnetic field reaching the magnet is weakened. Therefore, it is possible to prevent the magnetic field from being weakened by the magnetic field of the power receiving coil and the performance is deteriorated.

According to a third aspect of the invention, there is provided a magnetic member disposed between the power receiving coil and the yoke.

According to the above configuration, the magnetic field generated when the power is generated by the power receiving coil flows through the magnetic member, and the magnetic field reaching the yoke is weakened, so that the yoke is prevented from being inductively heated by the magnetic field of the power receiving coil, thereby causing performance degradation. .

According to a second aspect of the invention, the driving mechanism is configured such that the magnet is disposed inside the yoke, and the power receiving coil surrounds the yoke, and the coil surface is opposite to an N pole of the magnet The direction of the magnetic pole connected to the S pole is orthogonal.

According to the above configuration, since the N-pole surface and the S-pole surface of the magnet can be opened, it is possible to easily arrange various components that are activated by the change of the magnetic field in the magnetic pole direction of the magnet.

According to a second aspect of the invention, the driving mechanism is configured such that the magnet is disposed inside the yoke, and the power receiving coil surrounds the yoke and the coil The surface is parallel to the magnetic pole direction connecting the N pole and the S pole of the magnet.

According to the above configuration, the diamagnetic field formed by the power receiving coils on the N-pole surface and the S-pole surface of the magnet is reduced, so that the magnetic weakening or demagnetization of the magnet due to the diamagnetic field can be reduced.

According to a sixth aspect of the invention, the power receiving coil of the power receiving unit generates electric power by wireless power supply by a magnetic field resonance method.

According to the above configuration, it is possible to perform charging by wireless over a long distance as compared with the case where the power receiving coil that generates electric power according to the electromagnetic induction method is provided.

According to a seventh aspect of the invention, the drive mechanism is a speaker.

According to the configuration described above, when the power receiving device that receives the power for charging the secondary battery is provided in the driving device, when the driving device is installed in the device body, it is not necessary to secure the place where the power receiving mechanism is used in the device body. . Thereby, the degree of freedom in design of the device body can be expanded in the case of determining the size or style.

The eighth invention includes the drive device according to any one of the first to seventh inventions.

According to the above configuration, it is possible to easily achieve miniaturization, weight reduction, and various styles required for the portable device.

According to a ninth aspect of the invention, a drive device provided in a main body including a secondary battery and supplied with electric power for charging the secondary battery, includes a drive mechanism that operates using the electric power, and has control to charge the secondary battery A circuit board of a charging circuit.

According to the above configuration, since the circuit board of the charging circuit is provided in the driving device, it is not necessary to secure the arrangement place of the circuit board of the charging circuit in the device body as compared with the case where the circuit board of the charging circuit is provided in the device body. Thereby, the degree of freedom in design of the device body can be expanded in the case of determining the size or style.

According to a tenth aspect of the invention, there is provided a power receiving mechanism for receiving electric power charged to the secondary battery.

According to the configuration described above, by providing the power receiving mechanism that receives the electric power charged to the secondary battery to the driving device, it is not necessary to secure the arrangement place for the power receiving mechanism in the device body. Thereby, the degree of freedom in design of the device body can be expanded in the case of determining the size or style.

According to a tenth aspect of the invention, the drive mechanism includes a magnet and a yoke that form a magnetic circuit, and the yoke is disposed between the power receiving mechanism and the magnet, and the power receiving mechanism generates power by wireless power supply. The power receiving coil.

According to the above configuration, the magnetic field generated when the power is generated by the power receiving coil flows through the yoke, and the magnetic field reaching the magnet is weakened. Therefore, it is possible to prevent the magnetic field from being weakened by the magnetic field of the power receiving coil and the performance is deteriorated.

According to a twelfth aspect of the invention, there is provided a magnetic member disposed between the power receiving coil and the yoke and the circuit board.

According to the above configuration, the magnetic field generated when the power is generated by the power receiving coil flows through the magnetic member, and the magnetic field reaching the yoke and the circuit board is weakened, so that the yoke can be prevented from being heated by the magnetic field of the power receiving coil. The performance is degraded, and at the same time, the circuits of the circuit substrate are not affected by the magnetic field.

According to a thirteenth aspect of the invention, the power receiving coil of the power receiving mechanism generates electric power by wireless power supply by a magnetic field resonance method.

According to the above configuration, in the case where the power receiving coil that generates electric power by the electromagnetic induction direction is provided, charging can be performed by wireless at a long distance.

According to a fourteenth aspect of the invention, the driving device is a speaker.

According to the configuration described above, by providing the power receiving mechanism that receives the electric power charged to the secondary battery to the driving device, it is not necessary to secure the configuration site for the power receiving mechanism in the device body as compared with the case where the driving device is installed in the device body. . Thereby, the degree of freedom in design of the device body can be expanded in the case of determining the size or style.

A fifteenth invention is the drive device according to any one of the ninth to fourteenth aspects.

According to the above configuration, it is possible to easily achieve miniaturization, weight reduction, and various styles required for the portable device.

According to the present invention, it is possible to expand the degree of freedom in design when determining the size or style.

1‧‧‧ drive

2‧‧‧ device body

3‧‧‧Charging device

7‧‧‧Charging device

8‧‧‧Charging system

9‧‧‧ earphones

10‧‧‧Portable Machine

11‧‧‧Drive mechanism

12‧‧‧ Magnetic components

13‧‧‧Power receiving agencies

14‧‧‧ circuit board

15‧‧‧Speaker stand

15a‧‧‧Upper surface

15b‧‧‧lower surface

16‧‧‧Vibration plate

21‧‧‧Switch Department

22‧‧‧Secondary battery

63‧‧‧Control substrate

71‧‧‧Power supply coil

71a‧‧‧Power supply resonator

71b‧‧‧Power supply coil

72‧‧‧Power Supply Department

73‧‧‧Control Department

91‧‧‧ headphone body

92‧‧‧ ear mold

93‧‧‧Connecting Department

101‧‧‧Speaker device

111‧‧‧ Magnet

111a‧‧‧Upper surface

111b‧‧‧ lower surface

112‧‧‧Y yoke

112a‧‧‧Storage Department

112b‧‧‧Flange

113‧‧‧ pole boots

131a‧‧‧Resistance Resonator

131b‧‧‧Power take-out coil

114‧‧‧ voice coil

131‧‧‧Acoustic coil

141‧‧‧Charging circuit

1411‧‧‧Rectification/Stabilization Department

1412‧‧‧Charging Department

1413‧‧‧Charging Control Department

1414‧‧‧ Identification Department

1415‧‧‧Transformation Department (Processing Department)

1416‧‧‧Switch Control Department

1417‧‧‧Detection Department

G‧‧‧g

Mm‧‧‧mm

V‧‧‧Ford

Figure 1 is a block diagram of a portable machine including a drive unit.

Figure 2 is a block diagram of the driving device.

Figure 3 is a block diagram of a portable machine including a drive unit.

Fig. 4 is a schematic configuration diagram of a speaker device.

Fig. 5 is a schematic configuration diagram of a speaker device.

Fig. 6 is a schematic configuration diagram of a speaker device.

Fig. 7A is a schematic configuration diagram of a speaker device.

Fig. 7B is an explanatory view showing the relationship between the magnetic field of the magnet and the magnetic field of the coil.

Figure 8 is a block diagram of a charging system.

Fig. 9 is a schematic configuration diagram of a speaker device.

Fig. 10 is a schematic configuration diagram of an earphone type earphone.

Fig. 11 is a schematic configuration diagram of an earphone type earphone.

Fig. 12 is an explanatory view showing the relationship between the magnetic field of the coil and the yoke.

Fig. 13 is an explanatory view showing the relationship between the magnetic field of the coil, the magnetic member, and the yoke.

Fig. 14 is an explanatory view showing the relationship between the magnetic field of the coil, the magnetic member, and the yoke.

Fig. 15 is an explanatory diagram for measuring the adsorption force of a magnet.

Fig. 16 is an explanatory view for measuring the adsorption force of the magnet and the temperature of the yoke.

Fig. 17 is an explanatory view for measuring the adsorption force of the magnet and the temperature of the yoke.

An embodiment of the present invention will be described based on the drawings.

(drive unit 1)

As shown in FIG. 1, the drive device 1 is configured to be installed in the apparatus main body 2 including the secondary battery 22, and is supplied with electric power charged to the secondary battery 22. As the drive device 1, an acoustic device including a speaker, a mobile device including a motor, a vibration device, and an optical device including a light source can be exemplified. In the following description, the case where the portable device 10 is applied to the drive device 1 will be described, but the present invention is not limited thereto, and can be applied to, for example, a car (including an EV: an electric car) or a conveyor such as a locomotive or an airplane. It can also be applied to stationary machines such as personal computers. The apparatus main body 2 can be exemplified by a main body or a secondary battery 22 housed in a casing such as a transport machine or a portable machine.

(Drive device 1: drive mechanism 11, power receiving mechanism 13)

The drive device 1 has a drive mechanism 11 that operates by charging electric power to the secondary battery 22, and a power receiving mechanism 13 that receives electric power charged to the secondary battery 22. As a result, the drive mechanism 11 including the power receiving mechanism 13 can eliminate the need for the arrangement of the power receiving mechanism 13 in the apparatus main body 2. Therefore, the degree of freedom in designing the apparatus main body 2 can be expanded when the size or style is determined.

As the drive mechanism 11, a mechanism incorporating a component such as a speaker or a motor that converts electric power into kinetic energy, and an illuminating mechanism or an illuminating mechanism incorporating components such as an LED light source or a laser light source that converts electric power into light energy can be exemplified. And microcomputers, but all kinds of machines that are operated by electricity can be applied. The power receiving mechanism 13 may be configured to correspond to a wired power supply that supplies electric power by machine contact, or may be configured to correspond to wireless power supply that is powered by a mechanical non-contact state. As the wireless power supply, an electromagnetic induction method, a magnetic field resonance method (magnetic resonance method), and a radio wave method can be exemplified.

(Drive device 1: circuit board 14)

The drive device 1 includes a circuit board 14. The circuit substrate 14 has a charging circuit 141 that controls charging of the secondary battery 22. In addition, the charging circuit 141 may also be a circuit having a function of controlling discharge at the same time. Since the drive device 1 is provided with the circuit board 14 including the charging circuit 141, Further, compared with the case where the circuit board 14 is provided in the apparatus main body 2, the arrangement place of the circuit board 14 in the apparatus main body 2 is not required, so that the apparatus main body 2 can be expanded in design freedom in the case of determining the size or style. degree.

As shown in FIG. 2, the charging circuit 141 is provided with a switching function for switching the charging of the secondary battery 22 inside the circuit. Specifically, the circuit board 14 includes a rectifying/stabilizing unit 1411 that rectifies AC power supplied from the outside via the power receiving mechanism 13 that outputs AC power, and outputs DC power; the charging unit 1412 The DC power output from the rectification/stabilization unit 1411 is supplied to the secondary battery 22 at a charging voltage; the transformer unit (processing unit) 1415 performs signal processing, and the detecting unit 1417 detects power to the charging unit 1412. And the switching control unit 1416 switches the transformer unit (processing unit) 1415 from the active state to the stopped state only when the detecting unit 1417 detects the output of the power to the charging unit 1412. The transformer unit (processing unit) 1415 is connected to the drive mechanism 11 that is activated by the charging power of the secondary battery 22.

The rectifying/stabilizing unit 1411 can use a rectifying/stabilizing IC. The rectification/stabilization IC integrates functions such as full-bridge synchronous rectification, voltage regulation, wireless-power control, and protection against voltage/current/temperature anomalies into a single-chip IC. When the power output from the power receiving mechanism 13 is DC power, the rectification/stabilization unit 1411 is omitted.

The charging unit 1412 is a voltage/constant voltage linear-charging IC (charging circuit), and has a function of detecting that the charging current is reduced to a specific value of the set value or a charging end function by timing, and charging by heat-feedback. The current stabilization function and the wafer temperature limit function during high power operation or high ambient temperature conditions.

The transformer unit (processing unit) 1415 is a transformer circuit that functions as a changing unit that performs signal processing that converts the charging power of the secondary battery 22 into the driving power of the driving unit 11 and outputs the signal processing. The transformer unit (processing unit) 1415 is a linear regulator that can be used as a step-down application, and a switching regulator can be applied as a boosting and step-down application. Further, each of the regulators may be exemplified by a method in which a current is turned on/off at a high speed by a semiconductor element.

The detecting unit 1417 outputs a detecting circuit indicating that the self-rectifying/stabilizing unit 1411 outputs a detection signal of DC power to the charging unit 1412. The detecting unit 1417 may be formed by an analog circuit such as a transistor. Specifically, the detecting unit 1417 connects the base terminal of the NPN transistor to the output power line between the rectifying/stabilizing unit 1411 and the charging unit 1412, and grounds the emitter terminal. Further, the collector terminal is connected to the positive side of the secondary battery 22 via a resistor to be in a high impedance state, and is connected to the input terminal of the switching control unit 1416.

Therefore, when the self-rectifying/stabilizing unit 1411 does not output DC power, since the base terminal of the detecting unit 1417 is at a low level and the emitter terminal and the collector terminal are in a non-conducting state, a high level detection signal is obtained. It is output to the input terminal of the switching control unit 1416. On the other hand, when the self-rectifying/stabilizing unit 1411 supplies DC power to the charging unit 1412 via the output power line, the base terminal becomes a high level, and as a result, the collector terminal and the emitter terminal are turned on, and the collector terminal changes to The low level of the grounding point. As a result, when the DC power self-aligning/stabilizing unit 1411 is output to the charging unit 1412, a low-level detection signal is input to the input terminal of the switching control unit 1416. Further, the detecting unit 1417 may be formed by a digital circuit.

The switching control unit 1416 is a switching control circuit that turns the voltage converting unit (processing unit) 1415 into a stopped state when a low level detection signal is input from the detecting unit 1417, and inputs a high level detection signal. At the time (when the detection signal of the low level is not input), the transformer unit (processing unit) 1415 is brought into an active state. In the present embodiment, the detection signal of the low level is used as the stop condition of the transformer unit (processing unit) 1415 and the detection signal of the high level is used as the operating condition of the transformer unit (processing unit) 1415, but it is not The detection signal of the low level may be used as the start condition of the transformer unit (processing unit) 1415 and the detection signal of the high level as the stop condition of the transformer unit (processing unit) 1415.

Thereby, the circuit board 14 is formed so as to be able to automatically switch the driving mechanism 11 when the secondary battery 22 is charged according to the presence or absence of power supply from the outside to the secondary battery 22. The integrated circuit board which is permitted by the operation of the drive mechanism 11 at the time of the stop of charging can be formed in a simple circuit configuration and at a high density.

As shown in FIG. 3, the charging circuit 141 can be configured to output an on/off signal indicating the timing of charging, and output the conduction to the switch unit 21 including the on/off switch provided in the apparatus body 2. The charging of the secondary battery 22 is switched while the signal is turned off. Further, the switch unit 21 may be provided on the circuit board 14 of the drive device 1 together with the charging circuit 141.

As shown in FIG. 1, when the drive mechanism 11 in the drive device 1 has the magnet 111 and the yoke 112 forming the magnetic circuit, the yoke 112 is disposed between the power receiving mechanism 13 and the magnet 111, and the power receiving mechanism 13 is also disposed. A power receiving coil 131 that generates electric power by wireless power supply may be provided. In this case, the magnetic field generated when the power receiving coil 131 generates electric power flows through the yoke 112, and the magnetic field reaching the magnet 111 is weakened. Therefore, it is possible to prevent the magnet 111 from being weakened by the magnetic field of the power receiving coil 131, thereby deteriorating the performance.

Further, when the drive mechanism 11 includes the magnet 111 and the yoke 112, it is preferable to have the magnetic member 12 disposed between the power receiving coil 131 and the yoke 112. In this case, the magnetic field generated when the power is generated by the power receiving coil 131 flows through the magnetic member 12, and the magnetic field reaching the yoke 112 is weakened, so that the yoke 112 can be prevented from being induced by the magnetic field of the power receiving coil 131. The performance is degraded. Specifically, the magnetic deterioration due to induction heating can be prevented, and the temperature of the machine can be maintained at a specific temperature or lower specified by regulations or the like as long as it is a machine worn on the body.

(magnetic member 12)

Here, the magnetic member 12 is formed by a resin in which a magnetic powder is dispersed. The resin used in the magnetic member 12 may be a thermosetting resin or a thermoplastic resin, and is not particularly limited. For example, an epoxy resin, a phenol resin, a melamine resin, a vinyl ester resin, a cyanoester resin, a maleic imine resin, an anthraquinone resin, etc. are mentioned as a thermosetting resin. In addition, examples of the thermoplastic resin include an acrylic resin, a vinyl acetate resin, and a polyvinyl alcohol resin. In addition, in this embodiment, epoxy resin is mainly used. Resin.

Further, the magnetic powder dispersed in the resin is a soft magnetic powder. The soft magnetic powder is not particularly limited, and pure Fe, Fe-Si, Fe-Al-Si (aluminum strontium iron powder), Fe-Ni (nickel-iron alloy), soft ferrite magnet, Fe-based amorphous iridium, or the like can be used. Co-based amorphous germanium, and Fe-Co (iron-cobalt alloy). Further, the shape of the magnetic member 12 can be appropriately selected as well.

(secondary battery 22)

Here, the secondary battery 22 is applicable to all types of rechargeable batteries. For example, a lead storage battery, a control valve type lead storage battery, a lithium-air battery, a lithium ion battery, a lithium ion polymer battery, a lithium iron phosphate ion battery, a lithium-sulfur battery, a zirconium titanate-lithium battery, and a nickel-cadmium battery can be exemplified. , nickel-hydrogen battery, nickel-iron battery, nickel-lithium battery, nickel-zinc battery, rechargeable alkaline battery, nano-sulfur battery, redox-flow battery, zinc-bromine flow battery, tantalum battery, silver zinc battery ( Silver-Zinc: silver-zinc or the like is used as the secondary battery 22.

The nominal voltage of the nickel-hydrogen secondary battery 22 is the same as the nominal voltage of the air battery of the primary battery, and is 1.2V to 1.4V. Here, the term "nominal voltage" refers to a value defined as a standard for the voltage between terminals obtained when a battery is used in a normal state, and a battery that is nearly fully charged can be obtained with a higher rated voltage. High terminal voltage, but when discharging or supplying a large current to the load, a voltage lower than the nominal voltage is obtained.

As the secondary battery 22 whose nominal voltage exceeds the nominal voltage of the air battery, a lead storage battery, a control valve type lead storage battery, a lithium-air battery, a lithium ion battery, a lithium ion polymer battery, a manganese dioxide lithium secondary battery can be exemplified. 22. A lithium iron titanate secondary battery 22 or the like.

Moreover, the nominal voltage of lithium ion batteries and lithium ion polymer batteries is 3.6V~3.7V. The nominal voltage of the manganese dioxide lithium secondary battery 22 is 3.0V. The nominal voltage of the lithium titanate secondary battery 22 is 1.5V. Moreover, the voltage range of "discharge termination voltage" and "charge termination voltage" in a lithium ion battery is 2.7V to 4.2V. The term "discharge termination voltage" refers to the voltage of the lowest value of the discharge voltage that can be safely discharged, "charge termination voltage" The value is the voltage at which the highest value of the charging voltage can be safely charged.

The secondary battery 22 is preferably a lithium ion battery. In this case, since the nominal voltage of the lithium ion battery is in the range of 3.6V to 3.7V, the nominal voltage of the air battery or the nickel-hydrogen secondary battery 22 is 1.2V to 1.4V. Further, although the battery voltage of the lithium ion battery is lowered from about 4.2 V to about 2.7 V with discharge, the energy density is higher than that of the air battery or the nickel-hydrogen secondary battery 22, so that it can be used. In the case of an air battery or a nickel-hydrogen secondary battery 22, the machine is driven for a longer time.

(speaker device 101)

Next, a case where the drive device 1 is the speaker device 101 will be specifically described.

As shown in FIG. 4, the speaker device 101 has a hollow speaker stand 15 and a drive mechanism 11 which is a speaker provided in the speaker stand 15. The speaker frame 15 is formed in a cylindrical shape whose radius is enlarged from the lower surface 15b to the upper surface 15a, and the sound is emitted to the outside from the upper surface 15a.

The drive mechanism 11 has a magnet 111 and a yoke 112 and a pole piece 113, a voice coil 114, and a diaphragm 16. The magnet 111 is disposed at the center of the speaker frame 15. The magnet 111 includes a disk-shaped permanent magnet, and is configured such that an upper surface 111a and a lower surface 111b are respectively parallel to the upper surface 15a and the lower surface 15b of the speaker frame 15. The upper surface 111a and the lower surface 111b of the magnet 111 are used as an end face of the N pole or an end face of the S pole. Thereby, the magnet 111 is arranged such that the magnetic pole directions connecting the N pole and the S machine are parallel to the central axis of the speaker frame 15.

Above the magnet 111, a disk-shaped pole piece 113 and a ring-shaped voice coil 114 are disposed. The voice coil 114 is disposed such that the pole piece 113 is located on the inner peripheral side thereof. The magnet 111, the pole piece 113, and the voice coil 114 are surrounded by a yoke. The yoke 112 has a cylindrical accommodating portion 112a having an opening therethrough, and a flange portion 112b projecting outward from the upper peripheral edge portion of the accommodating portion 112a. The accommodating portion 112a houses the magnet 111, the pole piece 113, and the voice coil 114. Further, the flange portion 112b fixes the outer peripheral portion of the diaphragm 16 . The vibrating plate 16 converts the kinetic energy generated by the voice coil 114 and the magnet 111 into a sound of air vibration and outputs it.

Further, the speaker device 101 has a power receiving coil 131 that generates electric power by wireless power supply. The power receiving coil 131 is formed in a circular ring shape, and is arranged such that the magnet 111 is less likely to be magnetically weakened by the influence of the magnetic field of the power receiving coil 131, and is disposed on the inner peripheral side of the housing portion 112a of the yoke 112.

The power receiving coil 131 is set such that the coil surface parallel to the radial direction is parallel to the upper surface 111a and the lower surface 111b of the magnet 111. That is, the power receiving coil 131 is disposed so as to surround the yoke 112, and the coil surface is orthogonal to the magnetic pole directions of the N pole and the S pole of the connecting magnet 111. Thereby, since the N-pole surface and the S-pole surface of the magnet 111 can be made open, various components which are actuated by the change of the magnetic field in the magnetic pole direction of the magnet 111 can be easily arranged.

Further, the speaker 101 has a magnetic member 12. The magnetic member 12 is disposed between the power receiving coil 131 and the yoke 112. Specifically, the magnetic member 12 is formed in a ring shape and disposed between the power receiving coil 131 and the accommodating portion 112a of the yoke 112. Thereby, the magnetic field generated when the power is generated by the power receiving coil 131 flows through the magnetic member 12, and the magnetic field reaching the yoke 112 can be weakened, so that the yoke 112 can be prevented from being induced by the magnetic field of the power receiving coil 131. Causes performance degradation.

Further, the magnetic member 12 may be formed by combining a plurality of magnetic sheets. The combination method of the magnetic sheets may be a magnetic sheet combining the same size and the same shape, or a magnetic sheet combining different sizes or shapes. Further, the magnetic sheets may be arranged such that a gap is provided between adjacent magnetic sheets, or the magnetic sheets may be brought into contact with each other. When a gap is provided between adjacent magnetic sheets, the degree of freedom of the size and shape of the magnetic member 12 can be improved. When the magnetic sheets are brought into contact with each other, the magnetic member 12 having the same performance as the integrally formed magnetic member 12 can be provided, and at the same time, the size of the magnetic member can be freely changed by the increase or decrease of the magnetic sheet.

(Configuration of power receiving coil 131)

As shown in FIG. 5, in the speaker device 101, the power receiving coil 131 is disposed so as to surround the accommodating portion 112a of the yoke 112, but the present invention is not limited thereto. herein. In other words, the speaker device 101 may be disposed such that the power receiving coil 131 surrounds the flange portion 112b of the yoke 112.

Further, in the speaker device 101, the arrangement in which the coil surface of the power receiving coil 131 is parallel to the upper surface 111a and the lower surface 111b of the magnet 111 is arranged such that the coil surface is orthogonal to the magnetic pole direction of the magnet 111. Description, but not limited to this. That is, as shown in FIG. 6, the speaker shape 101 may be set such that the coil surface intersects the magnetic pole direction of the magnet 111.

As shown in FIG. 7A, the speaker device 101 may be disposed such that the magnet 111 is disposed inside the yoke 112, and the power receiving coil 131 surrounds the yoke 112, and the coil surface is parallel to the N pole and the S pole of the connecting magnet 111. Magnetic pole direction. In this case, as shown in FIG. 7B, since the diamagnetic field formed by the power receiving coil 131 on the N-pole surface and the S-pole surface of the magnet 111 is reduced, the magnetic weakening or demagnetization of the magnet 111 due to the diamagnetic field can be reduced.

(Portable Machine 10)

Next, a configuration in which the vibration device 1 including the magnetic field resonance type power receiving mechanism 13 is applied to the portable device 10 will be described.

As shown in FIG. 8, the portable device 10 has a drive device 1 including a power receiving coil 131 that supplies electric power from the outside by a resonance phenomenon, and a device body 2 including a secondary battery 22 having a chargeable and dischargeable force. Here, the term "resonance phenomenon" means that two or more coils are coherent at a resonance frequency. The portable device 10 thus constructed is charged by the charging device 7.

The charging device 7 includes a power feeding coil 71 that supplies electric power to the power receiving coil 131 of the portable device 10 by a resonance phenomenon. Further, the portable device 10 and the charging device 7 are configured as a charging system 8 that supplies (wireless power) electric power to the power receiving coil 131 from the power receiving coil 71 by a resonance phenomenon.

The circuit board 14 is disposed in a magnetic field space formed by a resonance phenomenon so as to have a smaller magnetic field strength than other portions. Specifically, as shown in FIG. 9, the power receiving coil 131 of the drive device 1 (speaker device 101) has the following configuration, that is, When the resonance phenomenon is applied, a space portion where the magnetic field is small appears at the inner position or the near position of the power receiving coil 131, and the space portion is used as the arrangement place of the circuit board 14. As a result, the drive device 1 prevents erroneous operation or heat generation at a specific temperature or higher by suppressing an eddy current generated by a magnetic field placed in the circuit board 14 in the space portion, and as a result, can be downsized. In addition, the details of the "space portion where the magnetic field is small" will be described later.

As shown in FIG. 8, the power receiving coil 131 has a power receiving resonator 131a and a power take-out coil 131b. The type of the coil used for the power receiving resonator 131a and the power take-out coil 131b can be exemplified by a spiral shape, a solenoid type, a ring shape, or the like.

The "portable device 10" in the present embodiment also includes any machine such as "handheld device (handheld)" and "wearable device (which can be worn on the body: body wearing device)". Specifically, the portable device 10 can be exemplified by a portable computer (laptop, notebook, tablet PC, etc.), or a headphone, a camera, an audio device, an AV (Audio-Video: audio). Video) Machine (portable music player, IC (integrated circuit) recorder, portable DVD (Digital versatile disk) player, computer (handheld computer, calculator), Game machines, computer peripherals (portable printers, portable scanners, portable data machines, etc.), special information machines (electronic dictionaries, electronic manuals, e-books, portable data terminal equipment, etc.), portable Communication terminal, audio communication terminal (portable telephone, PHS (Personal Handy-phone System), satellite telephone, third party wireless, amateur wireless, specific small power wireless, personal wireless, citizen radio, etc. ), data communication terminal (portable telephone ‧ PHS (functional mobile phone ‧ smart phone), handheld telephone, etc.), transceiver (TV ‧ radio), Portable radios, portable TV, one-seg TV, other machines (watches, pocket watches), hearing aids, hand-held GPS (Global Positioning System: Global Positioning System), the security buzzer, ‧ flashlight pen torch batteries. Further, the "hearing aid" can be exemplified by an ear-hook type hearing aid, an ear hole type hearing aid, and a glasses type hearing aid.

(Charging device 7)

The charging device 7 for charging the portable device 10 configured as described above has a power supply coil 71 that supplies electric power to the power receiving coil 131 of the portable device 10 by a resonance phenomenon. The power feeding coil 71 includes a power supply resonator 71a and a power supply coil 71b. The type of the coil used for the power supply resonator 71a and the power supply coil 71b can be exemplified by a spiral shape, a solenoid type, a ring shape, or the like. Further, the charging device 7 includes a power supply unit 72 that supplies AC power to the power supply coil 71, and a control unit 73 that controls the power supply unit 72.

The charging device 7 has a charging stand (not shown). When the portable device 10 is placed on the charging stand, the power supply coil 71 provided in the charging device 7 and the power receiving coil 131 included in the portable device 10 are disposed to face each other. Thereby, the secondary battery 22 can be charged by the wireless power supply by the magnetic resonance method only by placing the portable device 10 on the charging stand of the charging device 7. Further, the portable device 10 is removed from the charging stand of the charging device 7 to stop charging the secondary battery 22.

In addition, the charging device 7 is the same as the portable device 10, and may have a configuration in which a space portion in which a magnetic field is small is generated at an inner position or a near position of the power feeding coil 71 when power is supplied by a resonance phenomenon. The space portion serves as a place where the power source unit 72 or the control unit 73 is placed. In this case, the miniaturization of the charging device 7 can be realized in addition to the portable device 10.

(the part of the space where the magnetic field is small)

Next, the "space portion where the magnetic field is small" in the drive device 1 will be described in detail.

The drive device 1 is configured to form a "space portion having a small magnetic field" at a desired position. The formation of the desired portion of the space portion can be achieved by setting the positional relationship with the charging device 7, or the power supply conditions of the power supply state, internal configuration, and the like.

For example, the drive device 1 may be configured to supply power to the power supply resonator 71a when the power supply resonator 71a of the self-charging device 7 supplies power to the power receiving resonator 131a by a resonance phenomenon. The desired position between the electrical resonators 131a is formed by using a magnetic field space having a magnetic field strength smaller than the desired magnetic field strength as a "space portion".

When the method of forming the "space portion" is described in detail, the power supply resonator 71a of the self-charging device 7 can supply power to the power receiving resonator 131a of the portable device 10 (the driving device 1) by the resonance phenomenon. The method of setting the direction of the current flowing through the power supply resonator 71a and the direction of the current flowing through the power receiving resonator 131a is reversed, and the frequency of the power supplied to the power supply resonator 71a is set.

According to the above-described formation method, when the power transmission by the resonance phenomenon is performed, the power supply resonator 71a and the power receiving resonator 131a are arranged close to each other, and the coupling coefficient indicating the coupling strength between the power supply resonator 71a and the power receiving resonator 131a is made high. . When the transmission characteristic "S21" (the value of the power supply efficiency when the power is supplied from the power supply resonator 71a to the power receiving resonator 131a) is measured in a state where the coupling coefficient is high, the peak of the measured waveform is separated into a low frequency. Side and high frequency side. Further, by setting the frequency of the electric power supplied to the power supply resonator 71a to the frequency near the peak of the high frequency side, the direction of the current flowing through the power supply resonator 71a and the direction of the current flowing through the power receiving resonator 131a are reversed. By canceling the magnetic field generated on the inner peripheral side of the power supply resonator 71a and the magnetic field generated on the inner peripheral side of the power receiving resonator 131a, the magnetic field can be reduced to the inner peripheral side of the power supply resonator 71a and the power receiving resonator 131a. The magnetic field space having the magnetic field strength smaller than the inner peripheral side of the power supply resonator 71a and the power receiving resonator 131a is formed as a "space portion".

Further, as another method of forming the "space portion", a method is described in which, when the power is supplied from the power supply resonator 71a to the power receiving resonator 131a by the resonance phenomenon, the current flows in the power supply resonator 71a and flows to the power receiving state. The current direction of the resonator 131a is in the same direction, and the frequency of the electric power supplied to the power supply resonator 71a is set.

According to the above-described formation method, when the power transmission by the resonance phenomenon is performed, the power supply resonator 71a and the power receiving resonator 131a are arranged close to each other, thereby indicating that the power supply is common. The coupling coefficient of the coupling strength between the vibrator 71a and the power receiving resonator 131a becomes high. When the transmission characteristic is measured in a state where the coupling coefficient is high, the peak of the measurement waveform is separated into the low frequency side and the high frequency side. Further, by setting the frequency of the electric power supplied to the power supply resonator 71a to the frequency near the peak of the low frequency side, the current flowing in the power supply resonator 71a is in the same direction as the current flowing in the power receiving resonator 131a. By canceling the magnetic field generated on the outer peripheral side of the power supply resonator 71a and the magnetic field generated on the outer peripheral side of the power receiving resonator 131a, the influence of the magnetic field on the outer peripheral sides of the power supply resonator 71a and the power receiving resonator 131a can be reduced. Further, a magnetic field space having a magnetic field strength smaller than the magnetic field strength of the power supply resonator 71a and the power receiving resonator 131a is formed as a "space portion".

Further, the "space portion" can also change the adjustment parameters associated with the power supply resonator 71a and the power receiving resonator 131a, and can be set in accordance with the strength of the magnetic field coupling generated between the power supply resonator 71a and the power receiving resonator 131a. For example, the size of the magnetic field space can be enlarged by relatively weakening the magnetic field coupling generated between the power supply resonator 71a and the power receiving resonator 131a. On the other hand, by relatively enhancing the magnetic field coupling generated between the power supply resonator 71a and the power receiving resonator 131a, the magnitude of the magnetic field space can be reduced. Thereby, the "space portion" which is most suitable for the size of the portable machine 10 can be formed.

Alternatively, the arrangement relationship between the power supply resonator 71a and the arrangement relationship of the power receiving resonators 131a may be used as adjustment parameters, and the adjustment parameters may be changed to change the magnetic field coupling generated between the power supply resonator 71a and the power receiving resonator 131a. The strength, and the size of the magnetic field space.

Further, the "space portion" can be changed to the desired shape by changing the shape of the coils of the power supply resonator 71a and the power receiving resonator 131a to the power supply resonator 71a and the power receiving resonator. The strength of the magnetic field coupling between and around 131a is set to the desired shape. In this case, by setting the power supply resonator 71a and the power receiving resonator 131a to a desired shape, the magnetic field space having a relatively weak magnetic field strength can be formed in a desired shape along the shape of the coil.

Further, the "space portion" may have at least one of a first distance between the power supply resonator 71a and the power supply coil 71b and a second distance between the power take-out coil 131b and the power receiving resonator 131a as an adjustment parameter, and The size is set based on the adjustment parameter. For example, by shortening the first distance between the power supply resonator 71a and the power supply coil 71b and the second distance between the power take-out coil 131b and the power receiving resonator 131a, the magnetic field coupling can be weakened and the magnetic field space can be enlarged. size. On the other hand, by making the first distance between the power supply resonator 71a and the power supply coil 71b and the second distance between the power take-out coil 131b and the power receiving resonator 131a relatively long, it is possible to reduce the magnetic field coupling. The size of the magnetic field space.

Further, the "space portion" may be formed by using the magnetic member 12 or a magnetic member for adding a magnetic field space. Specifically, the magnetic member is disposed so as to cover at least a part of the surface of the power receiving resonator 131a and the power supply resonator 71a, and the magnetic field is changed between the electrical resonator 71a and the power receiving resonator 131a to perform electric power. The magnetic field space, which is transmitted at a desired position and having a magnetic field strength smaller than the desired magnetic field strength, is formed as a "space portion". For example, the magnetic member may be disposed to cover the inner peripheral surface of the power receiving resonator 131a. In this case, the magnetic field generated on the inner peripheral side of the power receiving resonator 131a can be blocked, and the magnetic field space having a relatively small magnetic field strength on the inner peripheral side of the power receiving resonator 131a can be formed as a "space portion".

Further, the magnetic member may be disposed so as to cover the surface opposite to the opposite surface of the power supply resonator 71a and the power receiving resonator 131a. In this case, the magnetic field generated near the surface opposite to the opposite surface of the power receiving resonator 131a can be blocked, and the magnetic field having a small magnetic field strength near the opposite side of the opposite surface of the power receiving resonator 131a can be blocked. The space is formed as a "space part."

In this manner, the driving device 1 of the portable device 10 can be intentionally formed as a magnetic field space having a small magnetic field strength at a desired position inside or near the power receiving coil 131 based on a combination of one or more of the above-described methods for forming the space portion. Space part", and can set "space The size or shape of the part. That is, the driving device 1 of the portable device 10 can form a desired space portion by the arrangement of the power receiving coils 131.

(human body wear machine)

Next, a description will be given of a case where the portable device 10 constructed as described above is a human body wearing machine. Further, in the present embodiment, the case where the human body wearing device is a headphone has been described, but the present invention is not limited thereto. That is, as the human body wearing machine, for example, the above-mentioned headphones or a music player, a device such as a hearing aid worn on the ear, or a machine equipped with a portable computer such as a goggle (glasses, etc.) can be worn on the face. Machines, such as watches, worn on the wrist, and even medical devices embedded in the human body.

As shown in FIG. 10, the ear-hook type earphone 9 includes: a headphone body 91 that is worn on the auricle; an ear mold 92 that abuts against or is in the vicinity of the ear hole opening; and a coupling portion 93 that connects the headphone The earphone body 91 and the ear die 92; and the control board 63 and the secondary battery 22 provided in the headphone body 91. The ear mold 92 has the speaker device 101 including the power receiving coil 131, and can charge the secondary battery 22 using electric power wirelessly supplied to the power receiving coil 131 by the magnetic field resonance method. Thereby, since the earphone 9 does not need to be disposed with the power receiving coil 131 in the headphone body 91, the degree of freedom in designing the size or shape of the headphone body 91 can be improved.

(magnetic field strength distribution)

As shown in FIG. 12, when the coil surface of the power receiving coil 131 is orthogonal to the magnetization direction of the magnet 111, the magnetic field intensity distribution of the power receiving coil 131 and the yoke 112 is investigated. First, in the case where the power receiving coil 131 is disposed and the power receiving coil 131 is disposed around the yoke 112, the magnetic field intensity distribution is analyzed by the electromagnetic field and analyzed.

According to the analysis result of the magnetic field intensity by the color tone, it is understood that a large-strength magnetic field exists in the entire periphery of the power receiving coil 131 when the power receiving coil 131 is alone, and the power receiving coil 131 is disposed in the yoke 112. In the surrounding case, the magnetic field in the yoke 112 becomes a significantly reduced strength. The reason is that the yoke 112 has iron as a main component. And has a high magnetic permeability. From this, it is clear that when the power receiving coil 131 is disposed around the yoke 112, the magnetic field from the power receiving coil 131 is blocked by the yoke 112, and the influence of the magnetic field on the magnet 111 in the yoke 112 can be reduced.

As shown in FIG. 13, next, in the case where the power receiving coil 131 is alone and the magnetic member 12 is disposed between the power receiving coil 131 and the yoke 112, the magnetic field intensity distribution is analyzed by electromagnetic field analysis. According to the analysis result of the magnetic field intensity by the color tone, it is understood that when the power receiving coil 131 is alone, a magnetic field having a large intensity exists in the entire periphery of the power receiving coil 131, and the magnetic member 12 is placed on the power receiving coil 131. In the case of the yoke 112, the strength of the magnetic field within the yoke 112 is significantly reduced.

Further, in the case where the magnetic member 12 is disposed between the power receiving coil 131 and the yoke 112, the center axis of the power receiving coil 131 is compared with the case where only the power receiving coil 131 is disposed around the yoke 112 in FIG. The strength of the magnetic field around it is further reduced, and the influence of the magnetic field on the magnet 111 in the yoke 112 can be further reduced.

As shown in FIG. 14, when the coil surface of the power receiving coil 131 is orthogonal to the magnetization direction of the magnet 111, the magnetic field intensity distribution of the power receiving coil 131 and the yoke 112 disposed in the magnetic member 12 can be investigated. It is found that the magnetic field around the central axis of the power receiving coil 131 is lowered. Thereby, it can be presumed that the heat generation of the yoke 112 can be reduced.

(Magnetic field strength distribution: adsorption force of magnet, yoke temperature)

Next, in the case of the magnet 111 alone (the initial state of the magnet: the first state), the magnetic member 12 is disposed between the power receiving coil 131 and the yoke 112 (the magnetic member and the yoke and the magnet are included in the coil: the second In the case where the magnetic member 12 is not disposed between the power receiving coil 131 and the yoke 112 (the yoke and the magnet are included in the coil: the third state), and the magnet 111 is disposed only in the power receiving coil 131 (the first) In the four states of the four states, the adsorption force of the magnet 111 that makes the coil surface of the power receiving coil 131 orthogonal to the magnetization direction of the magnet 111 is measured, and the temperature of the yoke measured in the second and third states is measured. .

If specifically described, a disc shape having a diameter of 7 mm and a thickness of 1 mm is prepared. The magnet 111 has a yoke 112 having a diameter of 9 mm and a flange portion having a diameter of 14 mm and a thickness of 4 mm. Further, the power receiving coil 131 and the power feeding coil 71 having the form of Table 1 are prepared.

As shown in Fig. 15, the magnet 111 is connected to the spring balance and suspended, and the suction force (g) of the iron plate placed opposite to the magnet 111 is measured by a spring balance (first state). .

Next, the magnet 111 is placed in the power receiving coil 131, and is measured by a spring balance on the adsorption force (g) of the magnet 111 attracted to the iron plate when the wireless power supply is performed by the resonance frequency of 1 MHz at a specific time. state).

In addition, the magnet 111 is placed in the yoke 112, and is placed in the power receiving coil 131, and is measured by a spring balance. The magnet 111 is attracted to the wireless power supply by the magnetic field resonance method at a specific frequency of 1 MHz. The adsorption force (g) of the iron plate and the temperature of the yoke (third state) were simultaneously measured.

As shown in FIG. 16 , the magnetic member 12 is placed in the power receiving coil 131 , and the magnet 111 is placed in the yoke 112 while the magnet 111 and the yoke 112 are placed in the magnetic member 12 . Then, the adsorption force (g) of the magnet 111 attracted to the iron plate at the time of wireless power supply in which the magnetic field resonance method was performed at a specific time by the resonance frequency of 1 MHz was measured with a spring balance, and the temperature of the yoke (second state) was simultaneously measured.

Table 2 shows the above measurement results. Thereby, the first to third forms have an adsorption force of 1150 g, whereas the fourth mode has an adsorption force of 1080 g, whereby the magnetization direction of the coil surface of the power receiving coil 131 with respect to the magnet 111 can be clarified. In the case of orthogonality, the magnetic field generated by the power receiving coil 131 acts as a counter magnetic field against the magnetic field of the magnet 111, thereby causing a decrease in magnetic force and demagnetization.

Further, the yoke temperature of the second mode is 32 degrees, whereas the yoke temperature of the third mode is 47 degrees, whereby the magnetic field of the power receiving coil 131 is passed through the magnetic member 12 to prevent the heating of the yoke 112. .

As shown in Fig. 17, next, the adsorption force of the magnet 111 in which the coil surface of the power receiving coil 131 is parallel to the magnetization direction of the magnet 111 is measured, and the yoke temperature is measured. Specifically, in the case of the magnet 111 alone (the initial state of the magnet: the fifth state), the magnetic member 12 is disposed between the power receiving coil 131 and the yoke 112 (the magnetic member and the yoke and the magnet are included in the coil) : (6th aspect), when the magnetic member 12 is not disposed between the power receiving coil 131 and the yoke 112 (the yoke and the magnet are included in the coil: the seventh state), and only the power receiving coil 131 is disposed. In the case of the magnet 111 (the eighth state), the adsorption force of the magnet 111 in which the coil surface of the power receiving coil 131 is parallel to the magnetization direction of the magnet 111 is measured, and is measured in the sixth state and the seventh state. The temperature of the yoke. The measurement results are shown in Table 3.

Thereby, the fifth to eighth states are the adsorption force of 1150 g, whereby the magnetic field portion generated by the power receiving coil 131 when the coil surface of the power receiving coil 131 is parallel to the magnetization direction of the magnet 111 can be clarified. It does not act as a demagnetizing field of the magnet 111, so that demagnetization can be prevented.

Further, the yoke temperature of the sixth aspect is 30 degrees, whereas the yoke temperature of the seventh state is 44 degrees, whereby the magnetic field of the power receiving coil 131 passes through the magnetic member 12, and the yoke 112 is prevented. heating. Further, as a result of comparison between the second mode and the third mode, it is clear that the coil surface of the power receiving coil 131 is orthogonal to the magnetization direction of the magnet 111, thereby being able to be reduced as compared with the case where the coil surface is parallel. Heating of the yoke temperature.

It is to be understood that the present invention is not limited to the embodiments described above, but may be applied to other embodiments, in order to facilitate the understanding of the present invention. Its scope of application should be as wide as possible Line explanation. The terms and grammars used in the specification are used to clearly illustrate the invention, and are not intended to limit the invention. Further, the inventors believe that other configurations, systems, methods, and the like included in the concept of the present invention can be easily inferred from the concept of the invention disclosed in the specification. Therefore, it is to be understood that the scope of the claims is to be construed as being equivalent to the equivalents of the invention. Further, in order to fully understand the object of the present invention and the effects of the present invention, it is desirable to fully understand the disclosed documents and the like.

1‧‧‧ drive

2‧‧‧ device body

3‧‧‧Charging device

10‧‧‧Portable Machine

11‧‧‧Drive mechanism

12‧‧‧ Magnetic components

13‧‧‧Power receiving agencies

14‧‧‧ circuit board

22‧‧‧Secondary battery

111‧‧‧ Magnet

112‧‧‧Y yoke

131‧‧‧Acoustic coil

141‧‧‧Charging circuit

Claims (7)

A driving device provided in a device body including a secondary battery and supplied with electric power for charging the secondary battery, and includes: a driving device that operates using the electric power; and a circuit substrate having a control pair Charging circuit for charging the secondary battery. A driving device according to claim 1, which has a power receiving mechanism that receives power for charging the secondary battery. The driving device of claim 2, wherein the driving mechanism includes a magnet and a yoke that form a magnetic circuit, and the yoke is disposed between the power receiving mechanism and the magnet, and the power receiving mechanism receives power by wireless power supply. Power receiving coil. A driving device according to claim 3, comprising a magnetic member disposed between the power receiving coil and the yoke and the circuit board. The driving device according to any one of claims 2 to 4, wherein the power receiving coil of the power receiving mechanism generates power by wireless power supply by a magnetic field resonance method. The driving device of any one of claims 1 to 4, wherein the driving mechanism is a speaker. A portable machine having the driving device of any one of claims 1 to 4.