JPH0622060A - Communication terminal equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To minimize power consumption in a standby state for an incoming call in a battery-powered communication terminal device. [Structure] An automatic reception control circuit 20 is provided in which the power supply voltage is always backed up and which detects a ring signal sent through a telephone line when an incoming call arrives. When the automatic reception control circuit 20 detects a ring signal, a power supply voltage is supplied to each circuit, and a power supply control circuit 2, 10, which detects the end of communication and stops the supply of the power supply voltage to each circuit. 26
With.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device such as a facsimile device.

[0002]

2. Description of the Related Art Conventionally, a printer unit is always incorporated in a facsimile machine, but the existence of this printer unit necessitates the apparatus to be heavy and large.

The applicant of the present application proposes a portable facsimile machine which is small in size and light in weight and convenient to carry because the printer section is separated from the facsimile machine. This facsimile machine is battery-powered and is used by appropriately connecting to a telephone line. For example, a memory (usually, A4 size) capable of storing facsimile data for 20 pages or more.
(Backed up by a battery), facsimile data stored in this memory can be displayed on an LCD and read. Further, it is possible to print out the stored facsimile data by connecting a dedicated printer.

[0004]

By the way, in this type of communication terminal device, it is often unclear when an incoming call arrives. Therefore, in order to always accept an incoming call, the standby state is always turned on. I had to keep it. In this standby state, power is supplied to all the functions of the terminal device or the function parts for the call and communication for the purpose of communication if it is a telephone or for communication if it is a facsimile. The power is turned on and the power is consumed unnecessarily. Therefore, in the case of the communication terminal device such as the above-mentioned portable facsimile device, the power source is the battery, which has a drawback that the life of the battery is shortened.

[0005]

In order to solve the above-mentioned problems, the communication terminal device according to the present invention uses the battery 1 as a power source and is connected to the telephone line Ln when the reference numerals of the embodiments described later correspond to each other. Which is used as a communication terminal device, in which the power supply voltage is backed up, and an automatic reception control circuit 20 for detecting a ring signal sent through a telephone line when an incoming call is received, and the automatic reception control circuit 20 detects a ring signal Then, the power supply control circuits 2, 10 and 26 are provided for supplying the power supply voltage to each circuit and detecting the end of communication to stop the supply of the power supply voltage to each circuit.

[0006]

According to the present invention having the above-mentioned structure, the power is supplied to the circuit portion necessary for a telephone call or communication only when the ring signal sent at the time of incoming call is detected. According to the present invention, in the standby state, the power is supplied only to the ring signal detection circuit and the circuit necessary for power-on, and the main circuit parts required for a call or communication are not energized, so that the power consumption is minimized. Can be suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a communication terminal device according to the present invention will be described below with reference to the drawings, taking as an example the case of being applied to the above-mentioned battery-driven portable facsimile device.

FIG. 1 shows the construction of an embodiment of the main part of the portable facsimile apparatus of this example, which incorporates a rechargeable battery 1, for example, a nickel-cadmium battery as a power source. The battery 1 is supplied to the power supply circuit 3 via the main power supply switch circuit 2, and when the power supply switch circuit 2 is turned on, the main power supply voltage MP is supplied from the power supply circuit 3 to the facsimile circuit 4 and other circuits. Is configured to be supplied.

Reference numeral 10 is a system controller (hereinafter abbreviated as "syscon") including a microcomputer. The system controller 10 detects the on / off state of the manual power switch 5. When the switch 5 is turned on, the output signal Pon of the syscon 10 becomes "L" level, and the Q output of the latch circuit 6 composed of the D flip-flop circuit becomes "H" level, which is passed through the OR gate 7. The power switch circuit 2 is turned on.

When the manual power switch 5 is turned off, the output signal Poff of the syscon 10 becomes "H" level, the output signal Poff is supplied to the base of the transistor 8, and the transistor 8 is turned on. Become. Therefore, the collector output of the transistor 8 becomes "L" level, the latch circuit 6 is reset,
The Q output of the latch circuit 6 becomes "L" level, and the power switch circuit 2 is turned off. A backup power supply voltage BP of, for example, 5V is applied to the microcomputer of the syscon 10 and the transistor 8 regardless of whether the main power supply switch circuit 2 is on or off.

Further, in this example, the system controller 10 has a timer (not shown) for data input, key input, etc.
When it is detected that there is no state change for a predetermined time or more, for example, 2 minutes or more, the output signal Poff is set to "H".
Get up to a level. Therefore, the transistor 8 is turned on, the latch circuit 6 is reset, and the power switch circuit 2 is turned off. This avoids wasteful consumption of the battery 1.

When the power supply switch circuit 2 is turned on and the power supply circuit 3 starts up, the rising edge of the main power supply voltage MP is detected by the rising edge detection circuit 9, and the detection pulse is input to the syscon 10. In response to this, the system controller 10 activates a program as a facsimile device.

The above is the turning on / off of the power source by the manual power source switch 5 and the startup of the facsimile apparatus. In the present invention, the manual power source switch 5 is used.
Is turned off, and therefore, even when the main power supply switch circuit 2 is off and the main power supply is not turned on to each part such as the facsimile circuit 4, the main power supply switch circuit 2 is automatically turned on based on the ring signal when the call arrives. Is configured to receive incoming calls.

That is, 20 is an automatic reception control circuit, which is a ring detection circuit 21 having a rectifier circuit, a bell signal generation circuit 22 for receiving a detection output of the ring detection circuit 21 and generating a bell signal, and this bell signal. A bell signal detection circuit 23 for detecting a bell signal from the signal generation circuit 22, for example, a photo coupler, a time constant circuit 24 composed of a resistor and a capacitor, and a NAND gate 25 for performing a logical operation as described later. , A latch circuit 26 for controlling the power switch circuit 2 including a D flip-flop circuit
And a mode selection switch 27 for selecting ON / OFF of the automatic reception mode and an ON / OFF of the mode selection switch 27.
And a transistor 28 for obtaining a control signal according to the off state. As shown in the figure, a portion of the automatic reception control circuit 20 that requires power supply, for example, a bell signal detection circuit 23, a mode selection switch 27, and a transistor 28.
The backup power supply voltage BP is always applied to the circuit.

The mode selection switch 27 turns on the illustrated terminal.
When it is switched to the side, the base of the transistor 28 becomes "L" level, the transistor 28 is turned off, and its collector output becomes "H" level, so that the collector output of the transistor 28 is supplied to one input terminal. The NAND gate 25 in the open state is in the open state, and the automatic reception ON mode is obtained in which the output signal NA corresponding to the signal supplied to the other input terminal is obtained.

In this automatic reception ON mode, the modular jack of the facsimile apparatus of this example is inserted into the modular type telephone outlet to obtain the telephone line L.
If it is connected to n, when there is an incoming call to this facsimile apparatus, the ring signal transmitted at the time of the incoming call is detected by the ring signal detecting circuit 21. Then, the ring signal detection signal from the ring signal detection circuit 21 is supplied to the bell signal generation circuit 22, and from this, a bell signal is generated. Although not shown, this bell signal causes a bell of a telephone provided in the facsimile machine to ring.

The bell signal from the bell signal generating circuit 22 is detected by a bell signal detecting circuit 23 composed of a photocoupler, and the bell signal is smoothed by a time constant circuit 24. The detection signal DE is obtained. The "H" level incoming detection signal DE is supplied to the other input terminal of the NAND gate 25. Therefore, the output NA of the NAND gate 25 is the arrival detection signal DE.
Changes to "L" level when the voltage rises to "H" level, and the Q output of the latch circuit 26 changes from "L" level to "H" level.
Become a level. Then, due to the Q output of the latch circuit 26, the power switch circuit 2 which has been off is turned on,
The main power supply voltage is applied from the power supply circuit 3 to the facsimile circuit 4 and other components, and the incoming call is ready.

Then, the power supply rise detection circuit 9 detects the rise of the main power supply, and the program of the syscon 10 is activated accordingly. Also, the output NA of the NAND gate 25 is input to the syscon 10,
It is detected that a ring signal has arrived, and
0 enters the automatic reception mode, receives facsimile data, and stores it in the built-in memory.

When the automatic reception is completed, as described above, the syscon 10 outputs the output signal when the timer detects that there is no state change such as data input or key input for 2 minutes or more. Raise Poff to "H" level. Then, the latch circuit 26 is reset, the power switch circuit 2 is turned off, and the automatic reception ends.

Further, the mode selection switch 27 has a terminal O
When switched to the FF side, the base potential of the transistor 28 becomes high, so that the transistor 28 is turned on and its collector output becomes substantially the ground potential. Therefore, the output of the NAND gate 25 is always at "H" level regardless of the state of the incoming detection signal DE supplied to the other input terminal. Therefore, the Q of the latch circuit 26
The output does not rise to the "H" level, and the power switch circuit 2 remains off. That is, the automatic reception operation is not performed.

FIG. 2 is a flowchart showing the sequence of the automatic reception ON mode described above. To explain this flowchart, when the ring signal is detected in the main power-off state (step 101) (step 102), the main power switch circuit 2 is turned on (step 103) as described above, and the system controller is turned on. 1
The 0 facsimile program is started (step 104), the line is closed (step 105), the automatic reception mode is entered, and facsimile data is received (step 106). Then, when the communication is completed (step 107) and it is detected that 2 minutes have passed thereafter (step 108), the output signal Poff of the syscon 10 rises to "H" level, and the main power-off processing is performed. Then, after that, the process returns to step 101 to continue waiting for the automatic reception mode.

In the above example, in the automatic reception mode, the timer determines the power-off timing after the end of communication, but when the signal for disconnecting the line sent from the station side is received, Based on this, the main power supply may be turned off.

In the above description, the case where the communication terminal device is a facsimile device has been described as an example, but it goes without saying that the present invention can be applied to a battery-operated telephone terminal and other communication terminal devices.

[0024]

As described above, according to the communication terminal device of the present invention, when the ring signal sent at the time of incoming call is detected, the main power supply is turned on so that the incoming call can be received. In the standby state, it is sufficient to backup the power supply to a few circuit parts while the main power supply is off, and the power consumption of the battery can be minimized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a main part of a communication terminal device according to the present invention.

FIG. 2 is a flowchart for explaining an operation sequence of a main part of one embodiment of the present invention.

[Explanation of symbols]

 1 Battery 2 Main Power Supply Switch Circuit 3 Power Supply Circuit 10 System Controller 20 Automatic Reception Control Circuit 21 Ring Signal Detection Circuit 22 Bell Signal Generation Circuit 23 Bell Signal Detection Circuit 24 Time Constant Circuit 25 NAND Gate 26 Latch Circuit 27 Automatic Reception Mode Selection Switch BP Backup Power Supply Voltage

Claims (3)

[Claims] 1. A communication terminal device which uses a battery as a power source and is connected to a telephone line to be used, wherein the power source voltage is backed up and the ring signal sent through the telephone line when an incoming call is detected is automatically detected. When a ring signal is detected by the reception control circuit and this automatic reception control circuit,
A power supply control circuit that supplies a power supply voltage to each circuit and detects the end of communication to stop the supply of the power supply voltage to each circuit. 2. The communication terminal device is a facsimile device, and when the ring signal is detected by the automatic reception control circuit, a power supply voltage is supplied to each circuit and automatic reception is started and reception is completed. The communication terminal device according to claim 1, wherein the supply of the power supply voltage to each of the circuits is stopped by detecting the above. 3. The power supply according to claim 2, further comprising a mode selection switch for selecting ON / OFF of automatic reception, and the power supply is determined by a logical operation result of the state of the mode selection switch and the detection output of the automatic reception control circuit. A communication terminal device configured to determine whether to operate a control circuit.