JPH04200140A - Cordless telephone slave set - Google Patents

Abstract

PURPOSE:To allow the user to continue telephone communication without any hindrance while avoiding intermission of talking on replacement of a battery by replacing a main battery with a spare battery based on a detection signal representing a voltage drop of the main battery. CONSTITUTION:A cordless telephone slave set 30 is removed from a slave set base 38 and used for a long time, and when the charge quantity of a 1st main battery 32 is depleted and its output voltage is decreased, a 1st voltage detector 54 detects the voltage drop and sends a detection signal to a control section 50. The control section 50 sends a control section immediately to a power changeover switch 36 so that no hindrance takes place in the function of the cordless telephone slave set 30 to select a switch from a contact of the 1st main battery 32 to a contact of a spare battery 34. Thus, the power to a load is supplied from the spare battery 34.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention transmits and receives radio waves between a base unit or a slave unit that is a telephone line connecting device, and transmits and receives radio waves to a place far from the base unit or slave unit. This invention relates to a cordless telephone handset that allows telephone communications to be carried out.

[Prior Art] In recent years, cordless telephones have been widely used that allow telephone communications to be made freely from a location away from a base unit or slave unit connected to a telephone line, making telephone communications within the home more convenient. It's improving. The handset of such a cordless phone transmits and receives radio waves to and from a handset base connected to a telephone line, and the handset itself contains a radio wave transmitting and receiving circuit and a battery for driving the circuit. has been done.

FIGS. 3(A) and 3(B) are schematic explanatory diagrams of a cordless telephone using such a conventional telephone handset, and FIG.
A number key 12, a receiver section 14, a transmitter section 16, and the like are provided on the outside of the cordless telephone handset 10 in A). A transmitting/receiving circuit 18, a driving battery 20, etc. are housed inside. Then, radio waves are transmitted and received via the antenna 22 between the handset stand 24 connected to the power supply or the base unit (not shown) also connected to the telephone line.

Further, the cordless telephone handset 10 is installed in the handset installation section 24a of the handset stand 24 shown in FIG. The driving battery 20 is being charged.

[Problems to be Solved by the Invention] However, the above-mentioned conventional cordless telephone handset 10 has the following problems:
The battery 20 is charged while it is installed on the handset stand 24, but if it is used for a long time away from the handset stand 24, the power of the battery 20 will be consumed and the battery 20 will be depleted. The output voltage decreases and eventually the battery 20 becomes exhausted. That is, in such a state, there is a problem in that the transmission and reception of radio waves between the cordless telephone handset 10 and the base unit cannot be performed satisfactorily, resulting in communication problems.

As described above, the conventional cordless telephone handset 10 is not provided with a means to notify the user of the state of charge of the drive battery 20 housed inside, and the cordless telephone handset 10 is not connected to the handset stand 24. If the phone is left uninstalled for a long time, there is a problem in that the phone suddenly goes into a poor communication state while the phone is in use.

Purpose of the Invention The present invention has been made with the aim of solving the above-mentioned problems.The purpose of the present invention is to solve the above-mentioned problems. To provide a cordless telephone handset which detects this and notifies the user and enables telephone communication in a good condition required for replacing the main battery.

[Means for Solving the Problems] In order to achieve the above object, the cordless telephone handset according to the present invention has a main battery as a driving power source replaceably housed, and transmits and receives radio waves to and from a telephone line connecting device. A cordless telephone handset that performs the following: a voltage detector for detecting the output voltage of the main battery; a spare battery provided separately from the main battery; and a battery switching means for switching a driving power source to the main battery or the spare battery. a control unit that sends a control signal to the battery switching means to switch the drive power source to the standby battery when the output voltage of the main battery becomes lower than a predetermined voltage based on the detection signal from the voltage detector; battery replacement time display means that receives a display control signal from the control unit when the voltage falls below a predetermined voltage and externally displays a voltage drop of the main battery;
It is characterized by including.

[Function] According to the cordless telephone handset having the above configuration, the voltage detector can detect the output voltage of the main battery as the driving power source. When this output voltage decreases due to power consumption, the control section switches the drive power source to the backup battery based on the detection signal from the second detector, and an external device is used to notify the user of the decrease in main battery voltage. Controls each part to perform display.

That is, the control section sends a control signal for switching the drive power source from the main battery to the spare battery to the battery switching means based on a detection signal indicating a voltage drop of the main battery. Thereby, the battery switching means switches the driving power source to the spare battery. As a result, the main battery is switched to the spare battery before it runs out, so the call is not interrupted when the battery is replaced, and the user can continue telephone communication without any hindrance.

Also, at this time, the control section simultaneously issues a display control signal to the battery replacement time display means. As a result, the battery replacement time display means externally displays the fact that the voltage of the main battery has decreased, allowing the user to continue telephone communication without any hindrance and also being able to recognize the necessity of replacing the main battery. .

As described above, according to the cordless telephone handset according to the present invention, even if the output voltage of the driving battery decreases due to long-term use of the cordless telephone handset, telephone communications will not be interrupted suddenly without warning. There is no fear that it will occur. In other words, when the output voltage of the drive battery decreases, the drive power source is switched to the spare battery, and
Since an external display is displayed to inform the user of the necessity of replacing the battery, the user can take action while recognizing that the amount of charge of the main battery has decreased.

[Example〕 Embodiments of the present invention will be described below based on the drawings.

1A and 1B are schematic explanatory diagrams of a cordless telephone using a cordless telephone handset 30 according to the present invention, and the same elements as the conventional cordless telephone shown in FIG. 4 are the same. A symbol is attached.

In FIG. 3A, a first main battery 32 is connected to the transmitting/receiving circuit 18 as a driving power source in a normal state.

The characteristic component of the present invention is this first main note/noteri 3.
In this embodiment, a spare battery 34, which is lighter than the first main battery 32 and smaller in size than the first main battery 32, is provided. This spare battery 34 is connected to a power source changeover switch 36 which is a battery changeover means.
It is connected to the transmitting/receiving circuit 18 via. The power supply selector switch 36 switches the power supply to the transmitter/receiver circuit 18 from the first
<・It is used to switch between the battery 32 and the spare battery 34. Note that the first main battery 32 is housed in the main body of the cordless telephone handset 10 in a replaceable manner.

Next, on the slave unit stand 38 shown in FIG.
In addition to 8a, a battery charging section 40 is also provided. The handset installation section 38a is a part where the cordless telephone handset 30 is installed when it is not in use, and in this handset connected state, the handset 30 is charged from the charging terminal 42.

The battery charging section 40 charges a second main battery 44 that is replaceable with the first main battery 32 currently housed in the cordless telephone handset 30. By loading the main battery 44, the second main battery 44 is charged from the charging terminal 48.

FIG. 2 is a schematic explanatory diagram showing the main components of the circuit configuration of the above embodiment. In the figure, a control section 50 controls the entire drive of the cordless telephone handset 30. As shown in FIG.

The first main battery 32 and the spare battery 34 are connected to a charging selector switch 52, and the cordless telephone handset 3
0 is installed in the handset installation part 38a of the handset stand 38, the first main battery 32 or the spare battery 34 is charged from the charging terminal 42 on the handset side via the charging changeover switch 52. has been done.

On the connection line between the first main battery 32 and the control unit 50, there is a first voltage detector 54 that detects the output voltage of the main battery.
is provided. Furthermore, in this embodiment, a spare battery is installed in the connection line between the spare battery 34 and the control unit 50.
A second voltage detector 56 is provided to detect the output voltage of the interior 34.

The control unit 50 is also connected to a power changeover switch 36, which switches the driving power source to the first main battery 32 or a spare battery 34 to supply power to loads such as the transmitting/receiving circuit. ing. .

Further, a display lamp 58 and an audio output means 60 are connected to the control unit 50 as external display means for notifying the voltage drop of the main battery.

Next, the operation of this embodiment will be explained.

First, it is assumed that the cordless telephone handset 30 is removed from the handset stand 38, and as a result of long-term use, the amount of charge in the first main battery 32 decreases and its output voltage decreases. At this time, the first
The voltage detector 54 detects the voltage drop and sends a detection signal to the control section 50.

Upon receiving this voltage drop detection signal, the control unit 50 immediately sends a control signal to the power selector switch 36 to prevent the cordless telephone handset 30 from interfering with its functions, and connects the spare battery 34 from the contact on the first main battery 32 side. Switch the switch to the side contact. As a result, power is supplied to the load side by the reserve battery 34.

Further, the control unit 50 controls the display lamp 58 and the audio output means 60 based on the voltage drop signal from the first voltage detector 54.
supplies an activation signal to the As a result, the indicator lamp 58 is lit, and the audio output means 60 uses a predetermined audio to notify the user of the decrease in the output voltage of the first main battery 32. Since a decrease in the output voltage of the first main battery 32 means that the main battery needs to be replaced, the content of the audio output is, for example, a voice such as "Please replace the battery."

Thereby, the user can visually recognize the necessity of replacing the main battery through the display lamp 58 and audibly through the audio output means 60.

In this case, in this embodiment, the user removes the second main battery 44 from the battery installation part 46 of the battery charging part 40 provided on the handset stand 38, and connects it to the first main battery 32 of the cordless phone handset 30. Can be exchanged. Since the second main battery 44 is in a sufficiently charged state, by replacing the main battery, the first voltage detector 54
A signal indicating that the voltage of the main battery is normal is supplied to the control unit 50. As a result, the control unit 50 sends a control signal to the power source changeover switch 36 again, and the power source changeover switch 36 is switched to the contact on the @2 main battery 44 side. Furthermore, by replacing the battery, the operation of the display lamp 58 and the audio output means 60 is also stopped.

Further, in this embodiment, the output voltage of the spare battery 34 is also detected by the second voltage detector 56. Therefore, when the control unit 50 receives a signal from the second voltage detector 56 indicating that the output voltage of the spare battery 34 has become lower than the predetermined voltage, the control unit 50 outputs the output voltage of the spare battery 34 to the display lamp 58 and the audio output means 60. provides a control signal for displaying a voltage drop. This control signal causes the indicator lamp 58 to indicate that the main battery should be replaced immediately;
For example, it performs a blinking display.

Furthermore, the audio output means 60 outputs audio to the effect that telephone communication will be disabled unless the main battery is replaced immediately.

As described above, according to this embodiment, when the output voltage of the first main battery 32 decreases due to long-term use, the power source is immediately switched to the spare battery 34, and an external display to that effect is displayed to notify the user. I can let you know. This allows the user to avoid a situation where telephone communication suddenly becomes impossible due to a voltage drop in the main battery. Furthermore, after switching to the spare battery 34, a drop in the output voltage of the spare battery 34 can be detected while telephone communication continues and this can be displayed externally, so the user can have a second A drop in the voltage of the drive power source can be notified in stages, thereby more reliably preventing sudden interruptions during a telephone call.

Note that the charging selector switch 52 is operated by a control signal from the control unit 50, but this operation is performed with priority given to charging the spare battery 34, and the main charge switch 52 is operated after the spare battery 34 is fully charged. It is controlled so that it can be switched to charge the battery side.

[Effects of the Invention] As explained above, according to the cordless telephone handset according to the present invention, when the handset is in use, it is possible to effectively prevent a sudden call failure state due to a drop in the output voltage of the drive battery. In addition, the display means can make the user aware of the necessity of battery replacement.

Thereby, the reliability of the telephone communication function of the cordless telephone can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a cordless telephone using the cordless telephone handset according to the embodiment, Fig. 2 is a main circuit diagram of the cordless telephone handset of the embodiment, and Fig. 3 is a diagram of the conventional cordless telephone handset. FIG. 2 is an explanatory diagram showing a schematic configuration. 30 ... Cordless telephone handset 32.44 ... Main battery 34 ... Spare battery 36 ... Power selection switch 38 ... Handset stand 40 ... Battery charging section 42, 48 ... Charging terminal 50 ... Control unit 52 ... Charging selector switch 54 ... First voltage detector 56 ... Second voltage detector 58 ... Display lamp 60 ... Audio output means

Claims (1)

[Scope of Claims] A cordless telephone handset that replaceably houses a main battery as a driving power source and transmits and receives radio waves to and from a telephone line connection device, comprising: a voltage detector that detects the output voltage of the main battery; a spare battery provided separately from the main battery; a battery switching means for switching the driving power source to the main battery or the spare battery; and an output voltage of the main battery that is lower than or equal to a predetermined voltage based on a detection signal from the voltage detector. a control unit that sends a control signal to the battery switching means to switch the drive power source to the standby battery side when the output voltage becomes lower than a predetermined voltage; A cordless telephone handset, comprising: battery replacement time display means for externally displaying a drop in main battery voltage.