JP2604281B2 - Cordless telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base unit connected to a general subscriber's telephone line unit, a slave unit capable of communicating with the master unit via a wireless line unit, and charging a rechargeable battery of the slave unit. And a cordless telephone provided with the above charger.

[0002]

2. Description of the Related Art In a cordless telephone, for example, a cordless telephone used in the United States and the like, it is confirmed that a master unit and a slave unit are paired with each other, and the master unit and the slave unit are connected to each other. In order to prevent erroneous connection and erroneous billing, security codes are registered in the master unit and the slave unit. In this security code, normally, as shown in the data format of FIG. 5, 8 bits, that is, 256 kinds of codes are selectively used. Conventionally, there have been the following methods for registering a security code, for example.

A. Registering by Operating the Switch A mechanical switch is provided for each of the master unit and the slave unit, and the security code is hard-registered by operating this switch.

B. Registration Using Charger Terminals Data is transmitted and received between the parent device and the child device via the terminal of the charger, and the security code is registered in the parent device and the child device. This security code registration is updated to a new security code each time the slave unit is placed on the charger and stored in the memories of the master unit and the slave unit.

[0005]

However, in the former method, the cost is increased due to the use of a mechanical switch, and there are many operations when the security code is changed, and it cannot be easily changed. There was a problem.

On the other hand, the latter method requires a dedicated circuit for transmitting and receiving data between the master unit and the slave unit, which increases the cost. Also, since the security code is updated every time the slave unit is placed on the charger, the security code matches the security code of the other slave units, and the probability of erroneous connection or erroneous billing is high. There was a problem of becoming.

[0007]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a detecting means for detecting that a slave unit is mounted on a charger,
A start switch for security code registration is provided, and when the start switch is operated within a certain period of time after the detection means detects that the slave unit is mounted on the charger, the parent switch is operated. The security code is registered in the handset and the handset.

[0008]

According to the present invention, when the start switch for security code registration is operated within a predetermined time after the slave unit is placed on the charger, a new security code is provided for the master unit and the slave unit. Is registered.

[0009]

1 and 2 show an embodiment of a master unit A and a slave unit B constituting a cordless telephone according to the present invention.

In FIG. 1 showing a master unit, 1 is an AC adapter for rectifying and smoothing a commercial AC power supply and converting it to a DC power supply. 2 is a charger provided integrally with the master unit A. 3 is a charger 2. The first charging terminal 4 is a charging detecting circuit as a detecting means for detecting that the slave unit B is mounted on the charger 2. Numeral 5 is an arithmetic control means, which is composed of, for example, a microcomputer of 4 bits per chip. The microcomputer 5 includes a program memory (ROM) 6, a data memory (RAM) 7, an IO port 8, a CPU 9, a counter 10, and the like. Reference numeral 11 denotes a security code registration start switch. Reference numeral 12 denotes a radio line unit, which includes a receiving antenna 13, a receiving circuit unit 14, and a transmitting antenna 1.
5 and a transmission circuit section 16. Reference numeral 17 denotes a circuit switching circuit, a ringer circuit, a keyboard, and the like for the master unit and the slave unit.
A main unit of the master unit including a handset (microphone and speaker) and the like, which is connected to a general subscriber telephone line unit 18. Reference numeral 19 denotes a backup battery at the time of a power failure;
Is a diode for preventing backflow, 22 is a transmitting / receiving circuit section 16,
14 is a power supply control circuit. Note that a rechargeable battery may be used as the backup battery.

2, reference numeral 23 denotes a rechargeable battery, for example, a Ni-Cd battery. Reference numeral 24 denotes a second charging terminal connected to the positive and negative electrodes of the battery 23. By being placed on the charger 2, the first charging terminal 3 of the charger 2 comes into contact with the second charging terminal 24 of the slave unit B, and the charger 2
The charging battery 23 is charged through the charging terminals 3 and 24. Reference numeral 25 denotes a charge detection circuit as detection means for detecting that the slave unit B is placed on the charger 2. Numeral 26 denotes arithmetic control means, which is composed of, for example, a 4-bit microcomputer per chip. Microcomputer 26
Has a program memory (ROM) 27, a data memory (RAM) 28, an I / O port 29, a CPU 30, a counter 31, and the like. Reference numeral 32 denotes a wireless line unit, which includes a receiving antenna 33, a receiving circuit unit 34, a transmitting antenna 35, and a transmitting circuit unit 36. 37 is a handset (microphone and speaker), 38 is a transmission / reception circuit unit 36,3
4 is a power supply control circuit.

The antennas of the master unit and the slave unit may use one antenna for transmission and reception. Next, the operation when the security code is registered in the cordless telephone configured as described above will be described with reference to the flow charts of FIGS.
This will be described with reference to a chart.

When the slave unit B is placed on the charger 2, the master unit A detects that the battery 23 of the slave unit B is charged by the charge detection circuit 4 (step 1). Sends a detection signal to the microcomputer 5. The microcomputer 5 receiving this detection signal controls the transmission circuit section 16 and performs security within a certain time (for example, 10 seconds) counted by the microcomputer 5.
It waits until the code registration start switch 11 is turned on (step 2). Within this fixed time, switch 11
Is set to the ON state (step 3), the microcomputer 5 transmits a new security code determined by the timing of operating the switch 11 as a security code registration signal to the transmission circuit unit 16 and the antenna 1
5 to the slave unit (step 4). Thereafter, when a response signal from the slave unit B is received (step 5), the new security code is stored and registered in the data memory (RAM) 7 in the microcomputer 5 (step 6).

On the other hand, the slave unit B detects that the battery 23 of the slave unit B is charged by the charge detection circuit 25 when the slave unit B is placed on the charger 2 (step 11). A detection signal is sent from the charge detection circuit 25 to the microcomputer 26. Microcomputer receiving this detection signal
The controller 26 controls the receiving circuit section 36 to the receiving state, and the security code registration signal is transmitted for a predetermined time (10 seconds) to the base unit A.
(Step 12). At this time, when the security code registration signal from the master unit A is received (step 13), the microcomputer 26 reads the new security code and sends a response signal including the new security code to the transmission circuit. The data is transmitted to the master unit A via the antenna 36 and the antenna 35, and the new security code is stored and registered in the data memory (RAM) 28 (step 14).

As is clear from FIGS. 3 and 4, if the switch 11 is not operated within 10 seconds after the slave unit B is placed on the charger 2, the security code is updated. There is no.

When the slave unit B is placed on the charger 2 for the first time after the power outage state is released from the power outage state, a new security code is immediately obtained without setting the switch 11 to ON within a predetermined time. -The data is the data of master unit A and slave unit B.
May be stored and registered in the data memories 7 and 28.

As described above, the security code is updated by setting the switch 11 to ON by the user within a predetermined time after the slave unit B is placed on the charger 2, and 32.

[0018]

According to the present invention, when the start switch for security code registration is operated within a fixed time after the slave unit is placed on the charger, the wireless line unit is connected between the master unit and the slave unit. The new security code is registered in the parent device and the child device through the transmission and reception of the security code, so that the security code can be changed without complicated operations or dedicated circuits. It can be done easily. Also, the security code is not changed every time the slave unit is placed on the charger.
The user selects whether to change the security code by operating the start switch within a predetermined time when the slave unit is placed on the charger. Therefore, since the security code is registered only when necessary, the probability that the security code matches the security code of another slave unit is extremely small.

[Brief description of the drawings]

FIG. 1 is a block diagram of a base unit constituting a cordless telephone according to the present invention.

FIG. 2 is a block diagram of a slave unit constituting the cordless telephone of the present invention.

FIG. 3 is a flowchart for explaining the operation of the parent device of the cordless telephone according to the present invention.

FIG. 4 is a flowchart for explaining the operation of the slave unit of the cordless telephone according to the present invention.

FIG. 5 shows the format of data transmitted and received between a parent device and a child device of a cordless telephone.

[Explanation of symbols]

 A Master unit B Slave unit 2 Charger 4, 25 Detection circuit 5, 26 Microcomputer 7, 28 Data memory 11 Start switch 12, 32 Wireless line section

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuichi Suetsugu 2--18 Keihanhondori Moriguchi City Sanyo Electric Co., Ltd. (72) Inventor Makoto Ejima 2-18 Keihanhondori Moriguchi City Sanyo Electric Co., Ltd. ( 56) References JP-A-62-20431 (JP, A) JP-A-60-223340 (JP, A) JP-A-2-265341 (JP, A)

Claims (2)

(57) [Claims] A master unit connected to a general subscriber telephone line unit, a slave unit capable of communicating with the master unit via a wireless line unit, and a charger for charging a rechargeable battery of the slave unit. In the provided cordless telephone, detection means for detecting that the slave unit is mounted on the charger, and a start switch for starting registration of the security code are provided, and the slave unit is mounted on the charger. The security code is registered in the master unit and the slave unit when the start switch is operated within a predetermined time after the detection by the detection unit. 2. The cordless telephone according to claim 1, wherein the data including the security code is transmitted and received between the master unit and the slave unit via the wireless line unit.