JPH05276680A - Power source for portable electronic apparatus using plural key switches - Google Patents

Abstract

PURPOSE:To use a portable electronic apparatus having a plurality of key switches such as a personal computer, a word processor, etc., without externally charging for a long time. CONSTITUTION:A voltage generated in a coil 5 by moving a magnet 4 provided in a key switch S by operating a pushbutton l of the switch is output from a coil output 7 for use. A key switch contact 6 is used for originally key- inputting. A capacitor C is charged through diodes D1-Dn to charge a rechargeable battery Ba built in a portable electronic apparatus by a DC/DC converter CN. Accordingly, since the battery Ba is continuously charged during keying operation of the apparatus, it can be used without primarily charging from an AC power source for a long time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply for a portable electronic device having a plurality of key switches operated by a rechargeable battery, and more particularly to a power supply for a portable personal computer, a word processor or the like.

[0002]

2. Description of the Related Art As a power source for these portable electronic devices that are operated by conventional rechargeable batteries, a charger that operates by alternating current cannot be generally used while going out or moving. Therefore, reduction in power consumption of electronic circuits such as microcomputers used for controlling electronic devices is being studied so that they can be used for a long time. In addition, by changing the operation mode of the microcomputer to reduce power consumption when there is no key input for more than the set time, or by automatically turning off the power when there is no key input for a long time. , It can be used for a longer time.

[0003]

The power supply of this conventional portable electronic device is designed to prolong the life of the internal battery by various measures as described above, but it is about 10 hours at the longest. In order to use it in an environment where it cannot be charged for a long time, it is necessary to prepare a spare battery, and in the unlikely event that the built-in battery reaches the end of life without a spare battery, you can purchase a place with an AC power supply or purchase a battery. There is a drawback that you cannot use it until you go to a place.

[0004]

A power supply for a portable electronic device having a plurality of key switches according to the present invention includes a rechargeable battery as a component thereof, and converts mechanical energy when the key switches are operated into electrical energy. And the function of charging the rechargeable battery with the electric energy. In addition, as will be described later, the function of converting mechanical energy into electrical energy is built into each of the plurality of key switches,
There are a method of using the sum of each output and a method of mechanically transmitting the mechanical energy of a plurality of key switches and converting the transmitted mechanical energy into electric energy by one or more conversion functions. ..

[0005]

The present invention will be described below with reference to the drawings. FIG. 1A is a sectional view of a key switch according to an embodiment of the present invention. In addition, FIG. 1B is a power supply circuit diagram in which a plurality of key switches are connected. In FIG. 1A, a key switch S is composed of a push button 1 of the key switch, a spring 2, a magnet 4, a coil 5, a key switch contact 6 and a coil 5 output 7 housed in a key switch case. When the push button 1 of the key switch is pressed by operating the key switch S, the magnet 4 moves inside the coil 5 to change the magnetic flux, so that a voltage is induced in the coil 5 and appears at the output 7.

These key switches S1 to Sn are shown in FIG.
Connect as shown in (b) and apply induced voltage to diodes D1 to Dn.
To charge the capacitor C. By converting the charging energy of the capacitor C by the DC-DC converter CN into the optimum current for the rechargeable battery Ba built in the portable electronic device and charging the same, the portable electronic device is continuously charged during key operation. The battery Ba will be charged. Number of key operations and coil 5 and magnet 4 under general equipment usage conditions
By considering and optimizing the performance and power consumption of the device, once the built-in rechargeable battery Ba is charged at the start of use,
A portable electronic device that can be used for an extremely long time can be configured.

FIG. 2 is a sectional view (a) of a key switch of another embodiment of the present invention and a sectional view (b) showing the relationship between the power generating section G and the key switch.
Is.

In FIG. 2A, a connecting rod 8 is provided which is rotated by a gear 9 and a claw 10 when the push button 1 of the key switch is pushed down. The claw 10 is connected to the connecting rod 8, and the connecting rod 8 does not rotate when the push button of the key switch returns. By grouping the key switches arranged in the same row with the connecting rods 8, it is not necessary to incorporate a power generation unit into each key switch as in the embodiment of FIG. 1, which is advantageous in that weight and cost can be reduced. .. By combining the configurations shown in FIG. 2 and connecting each row with an appropriate mechanism, one power generation section G can be used, and by rotating this power generation section G regardless of key operation You can also get the power of.

Further, in FIG. 1, an example of electromagnetic coupling has been described for converting mechanical energy for moving the key switch into electric energy, but in the present invention, conversion by a piezoelectric element or the like or electrostatic induction is used as the energy conversion method. Any means can be used and is not limited to one embodiment.

[0010]

As described above, according to the present invention, the built-in rechargeable battery is charged by converting the mechanical energy at the time of each key operation of the portable electronic device having a plurality of key switches into electric energy to charge the built-in rechargeable battery. It has an effect that it can be used for a long time.

[Brief description of drawings]

FIG. 1 is a sectional view and a circuit diagram of a key switch according to an embodiment of the present invention.

FIG. 2 is a sectional view of a key switch according to another embodiment of the present invention and a configuration diagram of a power generation unit.

[Explanation of symbols]

 S, S1 to Sn Key switch 1 Key switch push button 2 Spring 3 Key switch body 4 Magnet 5 Coil 6 Key switch contact 7 Coil output D1 to Dn Diode C Capacitor CN DC-DC converter Ba Rechargeable battery 8 Connecting rod 9 Gear 10 claw G power generation section

Claims (3)

[Claims] 1. A plurality of key switches and a rechargeable battery as constituent elements, a function of converting mechanical energy at the time of key switch operation into electric energy, and charging the rechargeable battery with the electric energy. A power supply for a portable electronic device having a plurality of key switches, which has a built-in function. 2. The key switch has a function of converting mechanical energy into electric energy, and the sum of electric energy output from each key switch is charged in a rechargeable battery. 1. A power supply for a portable electronic device having a plurality of key switches according to 1. 3. A means for mechanically transmitting mechanical energy of a plurality of key switches, and one or more conversion functions of the transmitted mechanical energy to electric energy. Power supply for a portable electronic device having a plurality of key switches.