JPH0341651Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a rechargeable electric shaver.

[Conventional technology]

FIG. 3 shows an example of a conventional electric shaver that can cope with a situation where the shaver stops operating due to consumption of battery power from a storage battery built into the razor body. In the figure, 1 is a transformer, 2 is a diode, and 3 is a main storage battery. The diode 2 and the main storage battery 3 are connected in series and are connected between both ends of the secondary winding 1a of the transformer 1. Further, 4 is another diode, 5 is a resistor, and 6 is an auxiliary storage battery, which are connected in series and are connected between both ends of the secondary winding 1a of the transformer 1. The connection point between the diode 2 and the main storage battery 3 is connected to one terminal 7a of the changeover switch 7, and the resistor 5
The connection point between the and the auxiliary storage battery 6 is the changeover switch 7.
It is connected to the other terminal 7b of. Further, the connection point between each storage battery 3, 6 and the secondary winding 1a and the common terminal 7c of the changeover switch 7 are connected via a razor drive motor 8.

This electric shaver usually has a switch of 7.
By connecting the common terminal 7c of the main storage battery 3 to the one terminal 7a, battery power of the main storage battery 3 is supplied to the motor 8 for shaving. When the power of the main battery 3 is consumed due to such use and the razor becomes unusable, the common terminal 7c of the changeover switch 7 is switched and connected to the other terminal 7b, so that the auxiliary storage battery 6 can be turned off. Electric power is supplied to the motor 8 to continue its use.

[Problem that the invention attempts to solve]

As described above, in the conventional electric shaver in which the main storage battery 3 and the auxiliary storage battery 6 are provided and used by switching between them, the auxiliary storage battery 6, which is normally in a standby state, self-discharges during standby. When switching due to power consumption, there were cases where sufficient power could not be supplied for shaving. Furthermore, since two storage batteries, the main storage battery 3 and the auxiliary storage battery 6, are indispensable, not only are the costs high, but also a large amount of storage space is required for these storage batteries 3 and 6, which hinders the miniaturization of electric shavers. There was a problem with how easy it was.

[Means for solving problems]

The present invention is implemented in an electric shaver equipped with a main discharge circuit that includes a storage battery, a razor drive motor, and a switching element and supplies electric power from the storage battery to the razor drive motor, and the switching element of the main discharge circuit. A bypass discharge circuit is provided in parallel, an auxiliary switch selectively opens and closes the discharge circuit, and a point in time when the residual power of the storage battery is slightly before the razor becomes unusable and there is still enough battery power to drive the motor a few times. The above conventional problems are solved by connecting drive stop circuits that turn off the switching element and stop the supply of power to the main discharge circuit.

[Effect]

In an electric shaver equipped with the above solution,
As the storage battery consumes power during use, when the battery power drops to a set value, the drive stop circuit stops supplying the battery power to the motor at that point. However, in this state, the storage battery does not consume almost all of its power, but still has enough remaining power to drive the motor a few times. Therefore, after the motor has been stopped during use as described above, by closing the auxiliary switch and selecting the bypass discharge circuit,
The residual power of the storage battery can be supplied to the motor to drive the motor to continue shaving.

〔Example〕

Reference numeral 11 in FIG. 1 showing an embodiment of the present invention is a charging circuit formed from a transformer 12 and a diode 13. For example, the charging circuit 11 has a rated voltage of 1.2V.
A Ni-Cd storage battery 14 is connected. and,
The power of the storage battery 14 is transferred to the motor 17 from the storage battery 14, a main switch 35 consisting of a common terminal 15a and one terminal 15b of the changeover switch 15, a switching element 30 consisting of a transistor, etc., and a razor drive motor 17. A main discharge circuit 18 is formed.

A bypass discharge circuit 33 is provided in parallel with the switching element 30 of the main discharge circuit 18, and a lamp 16 provided as required is connected in parallel.

In addition, 19 is a charging lighting circuit consisting of a diode 20 and a resistor 21, one end of which is connected to the transformer 1.
The other end is connected to the connection point between the terminal 15b of the changeover switch 15 and the lamp 16. Further, in FIG. 1, 15c is a common terminal of the changeover switch 15, and 15d is an OFF terminal of the changeover switch 15.

The main discharge circuit 18 includes a drive stop circuit 22.
is connected. This circuit 22 is connected to the storage battery 14
Shortly before the remaining power of the razor becomes unusable,
In addition, when there is enough remaining battery power to drive the motor 17 a small number of times (for example, about one to three times), the supply of battery power to the motor 17 is stopped.

That is, in the storage battery 14, a circuit formed by connecting a fixed resistor 23, a variable resistor 24, a fixed resistor 25, and a thermistor 26 for temperature correction in series in the stated order is connected to the common terminal 15 of the changeover switch 15.
a and one terminal 15b in parallel. Along with this, the storage battery 14 includes a fixed resistor 27, a fixed resistor 28, and a transistor 2.
A circuit formed by connecting 9 and 9 in series in the order of description is,
They are connected in parallel via the common terminal 15a and one terminal 15b of the changeover switch 15,
The base of the transistor 29 is the variable resistor 2
4 and the fixed resistor 25.
Further, a series circuit of a transistor 31 and a fixed resistor 32 is connected between the base of the switching element 30 and the other end of the motor 17 connected to the positive electrode of the storage battery 14, and the base of the transistor 31 is connected to the fixed resistor. 27 and the fixed resistor 28. As described above, the drive stop circuit 22 is formed. In this drive stop circuit 22, the magnitude of battery power (voltage in this case) for stopping the drive of the motor 17 is adjusted by a variable resistor 24, and the transistor 29 is turned off at a voltage value corresponding to the adjustment. .

Further, the main discharge circuit 18 includes a common terminal 15a of the changeover switch 15 and the other terminal 1.
An auxiliary switch 34 consisting of 5c is connected. This switch 34 is connected to the bypass discharge circuit 3.
3 selectively opens and closes the storage battery 14 by the drive stop circuit 22.
The remaining power is supplied to the motor 17.

In normal use, selector switch 15
Connect the common terminal 15a from the OFF terminal 15d to one terminal 15a and turn on the main switch 35. Then, the main discharge circuit 18 is closed, so the battery voltage of the storage battery 14 is divided according to the resistance values of the fixed resistor 23 and the variable resistor 24, and the resistance values of the fixed resistor 25 and thermistor 26. When the battery voltage between the transistor 25 and the battery voltage is equal to or higher than a set value (for example, 1.15V), the transistor 29 is turned on. This makes the fixed resistance 2
Current flows through the series circuit of transistors 7, 28, and transistor 29, turning on transistor 31, and as a result, current is applied to the base of switching element 30, which also turns on. Therefore, the battery power of the storage battery 14 is supplied to the motor 17, and the motor 17 is driven to perform shaving. In this case, the voltage between the collector and emitter of the switching element 30 is approximately
Since it is OV, the lamp 16 is off.

As a result of the use as described above, the battery power of the storage battery 14 is discharged (consumed), and as shown in FIG. 2, the variable resistor 24 and the fixed resistor 2 are
5 drops to the set value (1.15V), the transistor 29 turns off, which turns off the transistor 31, and then turns off the switching element 30, so that the battery power of the storage battery 14 to the motor 17 is The supply is stopped and the driving of the motor 17 is stopped. In this driving stopped state, the voltage value of the remaining power of the storage battery 14 becomes such that the razor becomes unusable, that is, the motor 1
The remaining power is higher than the voltage value (for example, 1.08 V) that cannot drive the motor 17 for a few times.

In addition, when the drive of the motor 17 is stopped by the drive stop circuit 22 as described above, the battery power of the storage battery 14 flows to the lamp 16 through the motor 17, but the resistance value of the lamp 16 is sufficient compared to the resistance value of the motor 17. , so the motor 17 is not driven and the lamp 16 is lit. As a result, the user can know that the storage battery 17 is about to run out, and can easily know when to switch from the main switch 35 of the changeover switch 15 to the auxiliary switch 34.

Therefore, in order to continue shaving from time t2, the common terminal 15a of the changeover switch 15 is connected to the other terminal 15c, and the auxiliary switch 34 is closed. Then, the remaining battery voltage of the storage battery 14 is supplied to the motor 17 by a part of the main discharge circuit 18 and the bypass discharge circuit 33.
The current flow at this time is as follows: storage battery 14 → motor 17 → bypass discharge circuit 33 → auxiliary switch 34 consisting of terminals 15c and 15a of changeover switch 15 → storage battery 14. As a result, the motor 17 is driven to continue shaving, and this drive continues until the remaining battery power of the storage battery 14 drops to 1.08V. Note that during this driving, no current flows through the lamp 16, so the lamp 16 is turned off.

Also, when charging the storage battery 14, the transformer 12
The storage battery 14 is charged by the current that flows from one end of the secondary winding 12a to the storage battery 14, the diode 13, and the other end of the secondary winding 12a. At the same time, the secondary winding 12a→motor 17
→ Lamp 16 → diode 20 and resistor 21 of charging lighting circuit 19 → secondary winding 12a, and the lamp 16 lights up to indicate that charging is in progress.

Although the above embodiment is constructed as described above, in the present invention, instead of the changeover switch, a main switch 35 for selecting the main discharge circuit 18 and an auxiliary switch 34 for selecting the bypass discharge circuit 33 are separately provided. Alternatively, the storage battery 14 may be implemented by connecting a plurality of batteries in series (therefore, there is only one storage battery 14). In addition, if a display means is provided, the lamp 1
6 may be replaced with a light emitting diode.

In addition, when implementing the present invention, unless it is contrary to the gist of the invention, the specific structure, position, etc. of the storage battery, motor, switching element, main discharge circuit, drive stop circuit, bypass discharge circuit, auxiliary switch, etc.
It goes without saying that the polarity, connection relationship, etc. are not limited to the one embodiment described above, and can be configured and implemented in various ways.

[Effect of idea]

According to the present invention, which has the configuration described in the above-mentioned utility model registration claims, the motor can be driven a small number of times during use without using up the battery power of one storage battery to the point where the razor becomes unusable. As soon as there is residual power left, the drive of the motor is temporarily stopped to alert the user, and then the circuit is switched to continue driving the motor with the remaining power of the storage battery. To provide an electric shaver having the same function as a conventional electric shaver that can continue shaving by switching between a main storage battery and an auxiliary storage battery, but only one storage battery can be used. By using only one storage battery in this way, even if battery power is consumed due to self-discharge, shaving can be continued reliably by switching the above-mentioned circuit, and the storage space for the storage battery can be reduced.
In addition, it has practical effects such as being able to reduce costs.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being a circuit diagram and Figure 2 showing the characteristics of the storage battery's battery power and time, as well as the changeover switch.
It is a figure which shows the relationship with the timing of ON-OFF. FIG. 3 is a circuit diagram of a conventional example. 14... Storage battery, 17... Motor, 18... Main discharge circuit, 22... Drive stop circuit, 30... Switching element, 33... Bypass discharge circuit, 34
...Auxiliary switch.

Claims (1)

[Scope of Claim for Utility Model Registration] An electric shaver comprising a storage battery, a razor drive motor, and a main discharge circuit that includes a switching element and supplies electric power from the storage battery to the razor drive motor, including: switching of the main discharge circuit; A bypass discharge circuit is provided in parallel with the element, and an auxiliary switch for selectively opening and closing the discharge circuit is provided, and the remaining battery power remains sufficient to drive the motor a few times just before the remaining power of the storage battery becomes unusable. The electric shaver is characterized in that a drive stop circuit is connected to each of the main discharge circuits to turn off the switching element and stop supplying the power when the switching element is switched off.