JPH0595147U - Charging device for electric appliances - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to charge the battery without mechanically connecting the main body of the electric device and the operability during charging, the reliability of water adhesion is high, and the main body of the electric device is miniaturized. -Providing a charging device that can be made lightweight and does not generate heat or noise during charging. A light source 30 is built in a charger 28, and light from the light source 30 is radiated through a translucent portion 21 when the main body 20 of an electric appliance such as an electric toothbrush is opposed to the charger. The solar cell 22 that houses the solar cell 22
2 is generated and the rechargeable battery 25 is charged through the diode 23 and the resistor 24.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a charging device that charges a charging battery in a main body of an electric appliance such as an electric toothbrush, an electric shaver, or a flashlight with a separate charger.

[0002]

[Prior Art]

 Conventionally, as charging devices for electric appliances as described above, there have been a direct charging method in which an electric appliance and a charger are connected by a terminal member for direct charging, and an electromagnetic induction charging method using a magnetic field.

FIG. 3 shows a direct charging type charging device in the case of an electric toothbrush. In this case, at the lower end of the electric toothbrush main body 1, a pair of male terminals 3 whose periphery is sealed by a packing 2 is projected, and the male terminal 3 is provided with a hole 5 provided on the upper surface of the charger 4. Through, and is fitted and connected to a pair of female terminals 6 inside thereof, and the rechargeable battery 7 in the electric toothbrush main body 1 is directly charged with electric power from the charger 4.

FIG. 4 shows a circuit configuration in this case. In the charger 4, the commercial power supply voltage is stepped down by the transformer 8 and then rectified by the diode 9, and the current is limited by the resistor 10, and the pair of female terminals 6 is used. Outputs DC voltage. On the other hand, on the side of the electric toothbrush main body 1, the DC voltage input from the pair of male terminals 3 is added to the rechargeable battery 7 via the backflow prevention diode 11 to be charged, and the motor 12 is driven by the rechargeable battery 7.

FIG. 5 shows an electromagnetic induction charging type charging device in the case of an electric toothbrush. In this case, the charger 4 houses the primary coil 13 connected to the commercial power source, and the electric toothbrush body 1 houses the secondary coil 14, and the lower end of the electric toothbrush body 1 contacts the upper surface of the charger 4. By doing so, the primary coil 13 and the secondary coil 14 are magnetically coupled, and an alternating current is induced in the secondary coil 14 by electromagnetic induction. Then, the alternating current is rectified by the diode 15 as shown in FIG. 6, the current is limited by the resistor 16, and the rechargeable battery 7 is charged.

[0006]

[Problems to be solved by the device]

 However, the above two types of charging devices have the following problems, respectively.

(Direct Charging Method) In the case of an electric toothbrush, since the main body 1 is washed with water before and after use, water often adheres to the male terminal 3, and when the male terminal 3 rusts, the female terminal on the charger 4 side is rusted. The reliability of the connection with 6 will be reduced. Further, since the main body 1 needs to have a waterproof structure, the packing 2 is required for each of the pair of male terminals 3, the structure including the terminal structure becomes complicated, and the number of parts increases. Further, it is necessary to apply a sufficient contact pressure for fitting and electrically connecting the male terminal 3 and the female terminal 6, and since a considerable force is required for fitting and withdrawing, operability is poor.

(Electromagnetic Induction Method) Since electromagnetic induction is used, the main body 1 and the charger 4 may simply be brought into contact with each other, and operability during charging is good, but since the secondary coil 14 is built in the main body 1, The main body 1 becomes large and heavy, and the operability of tooth brushing deteriorates. In addition, there is a defect that the secondary coil 14 generates heat during charging, or the main body 1 vibrates due to electromagnetic induction to generate noise.

The object of the present invention is to charge the battery without mechanically connecting the electric device body and the charger, which has good operability during charging and can improve reliability against water adhesion. Another object of the present invention is to provide a charging device that is capable of reducing the size and weight of the electric appliance itself and that does not generate heat or noise during charging.

[0010]

[Means for Solving the Problems]

 In the charging device according to the present invention, a light source 30 is built in the charger 28, and the light from the light source 30 is radiated into the electric appliance body 20 such as an electric toothbrush when the electric appliance body 20 faces the charger. The solar battery 22 is stored, and the charging battery 25 is charged with the electric power of the solar battery 22.

In addition, a transparent or semitransparent translucent portion 21 that allows light from the light source 30 to pass toward the solar cell 22 is provided in the electric device body 20. Further, between the solar cell 22 and the rechargeable battery 25, a diode 23 for preventing the reverse flow of current from the rechargeable battery 25 to the solar cell 22 and a resistor 24 for limiting the charging current are provided.

[0012]

[Action]

 For example, when the transparent portion 21 of the electric toothbrush main body 20 is opposed to the light source 30 of the charger 28 and the light from the light source 30 is transmitted through the transparent portion 21 and applied to the solar cell 22, the solar cell 22 is irradiated. Power is generated by the emitted light, and a charging current is supplied to the charging battery 25 through the diode 23 and the resistor 24, for example, to charge the charging battery 25.

[0013]

【Example】

 Next, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, a transparent or semitransparent translucent part 21 is provided at the lower end of the electric toothbrush body 20. A solar cell 22 is housed in the electric toothbrush main body 20 near the transparent portion 21. One electrode of the solar cell 22 is connected to one electrode of the charging battery 25 via the diode 23 and the resistor 24 in the electric toothbrush main body 20, and the other electrode is connected to the charging battery via the connection terminal 26. 25 is connected to the other electrode.

The diode 23 prevents reverse current flow from the rechargeable battery 25 to the solar cell 22, as shown in FIG. 2, and the resistor 24 limits the charging current. The motor 27 is driven by the electric power stored in the rechargeable battery 25. When the motor 27 is driven, the toothbrush is operated via a publicly known motion conversion unit (not shown).

On the other hand, a light projecting window 29 is provided on the upper surface of the charger 28, and a light source 30 is housed in the charger 28 near the light projecting window 29. Further, as shown in FIG. 2, a transformer 31 for stepping down the commercial power source and applying it to the light source 30 to emit light is housed in the charger 28.

To perform charging, the power source of the charger 28 is turned on to cause the light source 30 to emit light, and the transparent portion 21 of the electric toothbrush body 20 is opposed to the light projecting window 29 of the charger 28. Such light is transmitted through the translucent portion 21 and applied to the solar cell 22. The solar cell 22 generates power by the irradiated light, supplies a charging current to the charging battery 25 via the diode 23 and the resistor 24, and charges the charging current.

[0017]

[Effect of the device]

 The charging device according to the present invention has the following effects as compared with the conventional direct charging type and electromagnetic induction charging type charging devices, respectively.

(Compared to the conventional direct charging method) Since the electric terminal for charging does not protrude from the main body, there is no influence of corrosion by water, and reliability is improved. The number of parts can be reduced because electric terminals are not required. Since no electric terminals are required, the waterproof structure can be simplified and its reliability is improved. Charging is possible simply by bringing the main unit into contact with or close to the charger, so there is no need to insert or pull out the electrical terminals on the main unit side from the electrical terminals of the charger, improving operability.

Since a solar cell is used in place of the secondary coil (as compared with the conventional electromagnetic induction charging method), the main body can be made smaller and lighter. Since it is so-called light coupling, the force does not act between the main body and the charger as in magnetic coupling, so the main body does not vibrate during charging and therefore does not emit any sound. Since it is connected by light, the main body does not generate heat during charging.

[Brief description of drawings]

FIG. 1 is a sectional view showing a charging device according to an example of the present invention.

FIG. 2 is an electric circuit configuration diagram of the above.

FIG. 3 is a cross-sectional view of a conventional direct charging type charging device.

FIG. 4 is an electric circuit configuration diagram of the above.

FIG. 5 is a cross-sectional view of a conventional electromagnetic induction charging type charging device.

FIG. 6 is an electric circuit configuration diagram of the above.

[Explanation of symbols]

 20 Electric Toothbrush Main Body 21 Translucent Part 22 Solar Cell 23 Diode 24 Resistance 25 Rechargeable Battery 28 Charger 30 Light Source

Claims (3)

[Scope of utility model registration request] 1. A light source is built into a charger, and the light from the light source is provided in an electric appliance body such as an electric toothbrush that drives a motor with a rechargeable battery when the electric appliance body faces the charger. A charging device for an electric appliance, characterized in that a solar cell to be irradiated is housed and the rechargeable battery is charged with electric power of the solar cell. 2. The electric appliance according to claim 1, wherein the electric appliance main body is provided with a transparent or semitransparent translucent portion that transmits light from the light source toward the solar cell. Charging device. 3. A diode for preventing backflow of current from the rechargeable battery to the solar cell and a resistor for limiting charging current are provided between the solar cell and the rechargeable battery. Item 1. A charging device for an electric appliance according to Item 1.