JPH0515059A - Portable electronic devices - Google Patents

Abstract

PURPOSE:To provide a portable electronic equipment which can drive a heavy load effectively. CONSTITUTION:A power supply 5 of a main circuit 1 of a portable electronic equipment is separated from a power supply 6 of a heavy load circuit portion 3 and power is supplied from the power supply 6 to a motor 1 according to a drive signal from the main circuit 1. Also, the heavy load circuit portion 3 is formed into a unit along with the power supply 6 so that it can be mounted to or removed from the main unit of the equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electronic device, and more particularly to a thin portable electronic device having a selectively driven heavy load.

[0002]

2. Description of the Related Art In recent years, various portable electronic devices have been made thinner. For example, a portable electronic device having a heavy load such as a speaker such as a paging receiver has been thinned, and a paging receiver having a thickness of about 5 mm has been commercialized. In such a thin portable electronic device, a coin-type battery such as a lithium battery or a zinc-air battery is used as a power source.

[0003]

However, the coin type battery such as the above-mentioned lithium battery and zinc-air battery does not have sufficient load characteristics. For this reason, it is difficult to stably drive all circuits including a heavy load such as a speaker with this type of battery for a long period of time. For example, in a card type paging receiver, the volume of the speaker, which is a notification means of a call to itself, is set. It is said that it is not possible to install the vibrator because it is not possible to obtain sufficient power to drive the vibrator even if it is attempted to install the vibrator, which is an optional function, in this type of paging receiver. There is a problem. The present invention has been made in view of the above circumstances, and an object thereof is to provide a portable electronic device configured to efficiently drive a heavy load.

[0004]

According to the invention of claim 1 of the present invention, in order to achieve the above-mentioned object, in constructing a portable electronic device having a heavy load selectively driven, The power supply for the main body circuit of the portable electronic device and the drive power supply for the heavy load are separate power supplies, and the drive power is supplied from the drive power supply for the heavy load to the heavy load circuit by the heavy load drive signal from the main body circuit. That is the point. In the invention described in claim 2, the main point is that the heavy load is unitized together with the drive circuit and the drive power source, and can be attached to and detached from the portable electronic device body. In the invention according to claim 3, the heavy-duty drive power supply is configured by a chargeable power supply, and when the heavy-load is not driven, power is supplied from the main circuit power supply of the portable electronic device to the heavy-load drive power supply. The main point is to provide charging control means for supplying power to charge the battery and charging the heavy load to stop the power supply from the power source of the main circuit of the portable electronic device to the drive power source of the heavy load.

[0005]

According to the first aspect of the present invention, the power source of the main body circuit of the portable electronic device and the drive power source of the heavy load are separate power sources. Therefore, the power source of the main body circuit is accompanied by the driving of the heavy load. A sudden voltage drop does not occur, power consumption is reduced, and the main body circuit can be stably driven for a long period of time. Further, since the heavy-load drive power source consumes power only when the heavy load is selected, the heavy load can be efficiently driven, and the life of the drive power source can be extended. According to the second aspect of the invention, the heavy load is unitized together with the drive circuit and the drive power source and is detachably attached to the main body of the portable electronic device. Therefore, it is extremely easy to replace the drive power source, and the heavy load always has power. It can be driven by a driving power source, and the usability of the portable electronic device is extremely improved. Further, according to the third aspect of the invention, since the heavy-load drive power source can be charged, it is not necessary to replace the drive power source. In addition, since the heavy-load drive power supply is charged from the main circuit power supply only when the heavy load is not driven, the heavy-load drive power supply can be operated without causing a sudden voltage drop in the main circuit power supply. Since it can be charged and the drive power source for the heavy load can always be maintained in a state of having power, the heavy load can always be efficiently driven.

[0006]

[First Embodiment] FIG. 1 illustrates a first embodiment of the present invention. In this embodiment, a motor type vibrator provided in a paging receiver or the like has a heavy load. The main body circuit 1 and the heavy load circuit section 3 having a vibrator motor 2 as a main constituent element are connected via a connector 4. The main body circuit 1 has its own driving power source (primary battery) 5, and the heavy load circuit section 3 also has its own driving power source (primary battery) 6. The negative side of the power source 6 on the heavy load circuit section 3 side is connected to the emitter side of the transistor 7 provided on the heavy load circuit section 3 side, and the positive side of the power source 6 is connected to the positive terminal of the motor 2. The negative terminal of is connected to the collector side of the transistor 7. The base of the transistor 7 is connected to the main circuit 1 side. The diode 8 connected to both ends of the motor 2 is a protection diode for the transistor 7.

Since the heavy load circuit section 3 is connected to the main body circuit 1 side through the connector 4, it is unitized together with its drive circuit and the power source 6 and can be attached to and detached from the equipment main body through the connector 4. You can also do it.

Next, the operation of the above-described embodiment constructed as described above will be explained. When the vibrator drive signal is not output from the main body circuit 1, the transistor 7 is in the off state, and the output voltage of the power supply 6 is not applied to the motor 2, so the motor 2 does not rotate and the vibration as the vibrator does not occur. Does not occur. On the other hand, when the vibrator drive signal is output from the main body circuit 1, the drive signal is input to the base of the transistor 7, the transistor 7 is turned on, the output voltage of the power supply 6 is applied to the motor 2, and the motor 2 is turned on. Rotates, and vibration as a vibrator occurs.

As described above, since the electric power is supplied from the power source 6 on the heavy load circuit section 3 side to the motor 2 by the drive signal from the main body circuit 1 side, the power consumption consumed on the main body circuit 1 side. Is greatly reduced. Specifically, if h _FE is the current amplification factor of the transistor 7, the power consumption consumed on the main body side when driving the vibrator motor 2 is 1
/ H _FE . As a result, a vibrator that consumes a large amount of power can be provided, and the volume of the speaker can be made sufficiently high.

Further, if the entire heavy load circuit section 3 including the power source 6 is unitized so that it can be attached to and detached from the electronic equipment main body through the connector 4, the power source 6 can be replaced very easily, and the power is constantly supplied. Some power supply 6 can be used and the motor 2 can be operated effectively. In the above-described embodiment, the drive circuit for the motor 2 has a single-stage configuration including only the transistor 7, but may have a multi-stage configuration including two or more stages. If the drive circuit of the heavy load circuit section 3 has two or more stages of transistors, the power consumption on the main circuit 1 side when driving the motor 2 can be further reduced.

[0011]

[Second Embodiment] FIG. 2 illustrates a second embodiment of the present invention in which the power source on the side of the heavy load circuit section 3 is chargeable. The same reference numerals are given to the portions to be indicated, and the description thereof will be omitted. In this embodiment, a rechargeable power source 9 is used as a power source on the heavy load circuit section 3 side, and a transistor 10 is provided to control the charging of the power source 9. As the power source 9, a secondary battery such as a NiCd battery or a high capacity capacitor such as an electric double tank capacitor is used.

If the above-mentioned structure is adopted, when the vibrator drive signal is not output from the main body circuit 1 side, the transistor 7 is turned off, the transistor 10 is turned on, the motor 2 is not operated, and the transistor 10 is turned on. Via the power source 5 on the main circuit 1 side, the power source 9 on the heavy load circuit section 3 side is charged. On the other hand, when the vibrator drive signal is output from the main body circuit 1 side, the transistor 7 is turned on and at the same time the transistor 10 is turned off, and the power source 5 on the main body circuit 1 side charges the power source 9 on the heavy load circuit section 3 side. Is stopped, the motor 3 is driven only by the power source 9 on the heavy load circuit section 3 side. As a result, the power supply 5 on the main circuit 1 side is not loaded.

When the power source on the heavy load circuit section 3 side is a chargeable power source as in this embodiment, there is no need to replace the power source, so the heavy load circuit section 3 side is placed on the equipment main body. There is no need for a detachable unit on the side. In this case, it goes without saying that the connector 4 may be omitted.

[0014]

As described above, according to the present invention, the power source of the main body circuit of the portable electronic device and the drive power source of the heavy load circuit are separate power sources, and the drive power source of the heavy load is from the main body circuit. Since the electric power is supplied to the heavy load only when the heavy load drive signal is received, the heavy load does not have to be driven by the power source of the main circuit, and the power consumption of the main circuit can be significantly reduced. Further, the heavy load drive power source consumes power only when the heavy load is selected, so that the heavy load can be efficiently driven and the life of the drive power source can be extended. Also, if the heavy load is unitized with its drive circuit and drive power supply, and it is detachably attached to the body of the portable electronic device, replacement of the drive power supply becomes extremely easy and the heavy load is always driven by a drive power supply with power. In addition to that, there is an effect that the usability of the portable electronic device is extremely improved. When the heavy load drive power supply is chargeable, the heavy load drive power supply can be charged from the main circuit power supply when the heavy load is not driven, so that there is no need to replace the drive power supply. Further, the heavy load driving power source can be always kept in a power state by being charged from the power source of the main circuit, and the heavy load can always be efficiently driven.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a main part of a portable device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a main part of a portable device according to a second embodiment of the present invention.

[Explanation of symbols]

1 Main circuit 2 motor 3 heavy load circuit 4 connectors 5, 6, 9 power supply 7, 10 transistors

Claims (3)

[Claims] 1. A portable electronic device provided with a heavy load that is selectively driven, wherein a power source for the main body circuit of the portable electronic device and a drive power source for the heavy load are separate power sources, and a heavy load from the main body circuit is used. A portable electronic device characterized in that drive power is supplied from a drive power source for the heavy load to the heavy load in response to a load drive signal. 2. The portable electronic device according to claim 1, wherein the heavy load is unitized together with a drive circuit and a drive power source of the heavy load and is attachable to and detachable from the main body of the portable electronic device. 3. The heavy-duty drive power supply is composed of a chargeable power supply, and when the heavy-load is not driven, electric power is supplied from the main body circuit power supply to the heavy-load drive power supply for charging. 2. The portable electronic device according to claim 1, further comprising charge control means for stopping the power supply from the power source of the main body circuit to the drive power source of the heavy load when the heavy load is driven.