JP3191171B2 - 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 cordless telephone, and more particularly to a cordless telephone capable of reducing the maximum current consumption.

[0002]

2. Description of the Related Art Conventionally, cordless telephones, particularly cordless button telephones used in offices and the like, in which a plurality of telephones are connected via a main unit, are supplied with power from the main unit by so-called phantom power supply. Was configured to receive In this connection, for example,
The description in the Ricoh Key Telephone System FD Series Catalog (issued in March 1991) issued by Ricoh Co., Ltd. is useful.

[0003]

The above prior art is configured to supply power from a single main unit to a plurality of cordless key telephones. In recent years, there has been a demand for a cordless button telephone system to be smaller and lighter. The problem here is that
In order to reduce the size of the power supply device in the main unit of the system or the power supply transformer in the key telephone interface, it is necessary to minimize the current capacity used in the cordless key telephone. To achieve this, it is conceivable to add a code for accepting commercial power to the base unit of the cordless button telephone, but this poses another problem that a restriction on use is added. The present invention has been made in view of the above circumstances, and an object thereof is to solve the above-described problems in the related art, and to add a restriction on use as a whole system including a cordless telephone, An object of the present invention is to provide a cordless telephone capable of reducing the maximum current consumption. Another object of the present invention is to provide a cordless telephone which can reduce the maximum current consumption without restricting the use even in a cordless telephone used individually for home use or the like. .

[0004]

SUMMARY OF THE INVENTION The above objects of the present invention are as follows.
In a cordless telephone having a unit for charging a slave unit on the master unit side, when current consumption increases, such as when an incoming call is received by the telephone, stop charging the slave unit by the charging unit, Alternatively, the present invention is attained by a cordless telephone characterized by providing a means for controlling so as to limit the current to the minimum necessary.

[0005]

In the cordless telephone according to the present invention, when the current consumption increases, such as when an incoming call is received, the charging by the above-mentioned charging means is stopped or the setting of the slave unit is stopped .
The current is controlled to the minimum current required to detect the power consumption, and a temporary increase in current consumption is suppressed, so that the base unit of the cordless telephone or the main unit in the system including the cordless telephone is small.・ Lightening is possible.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 is a block diagram showing a schematic configuration of a system including a plurality of cordless button telephones according to an embodiment of the present invention, and FIG. 3 is a diagram showing the connection between the main device 1 and the cordless key telephone base unit. It is a detailed view showing a situation. As shown in FIG. 2, a main device 1 in the system shown in the present embodiment has an external line interface 2 corresponding to a plurality of external lines.
A communication path switch 3 for controlling the connection between the above-mentioned outside line and a plurality of extension telephones 3, a button telephone interface 4, which will be described later, a single telephone interface connected to and used by a facsimile apparatus 5 and the like, a control device 6 for controlling the above components, and storage It is composed of a device 7. Reference numerals 8 and 9 denote cordless button telephones, and reference numeral 10 denotes a facsimile apparatus. Button telephone interface 4 of main unit 1
Inside, as shown in FIG.
And a data transmission / reception interface circuit 42. Both circuits are provided with power supply transformers 43 and 44, respectively. The main unit 1 and the cordless key telephone are connected by four lines of voice / data pairs, and these also serve to supply power from the main unit 1 to the cordless key telephone by phantom power supply by a transformer described later. I am carrying it.

As described above, the cordless button telephone receives transmission / reception of control data and voice and power supply from the main unit 1. This supply power is limited by the power capacity of the main unit and the current capacity of the transformer.
Note that the cordless button telephones 8 and 9 and the like (hereinafter, described using the “cordless button telephone 8” as an example) are each composed of a parent device 8a and a child device 8b. A main device interface 81 is provided in the base unit 8a of the cordless button telephone, and a voice interface circuit 81a, a data transmission / reception interface circuit 81b, and transformers 81c and 81d are provided in the main device interface 81. FIG. 1 is a diagram showing a detailed internal configuration of the parent device 8a and the child device 8b of the cordless button telephone. Inside the base unit 8a of the cordless button telephone, in addition to the main unit interface 81, an audio circuit 82, a control unit 83 for controlling the whole, a wireless circuit 84 between the handset 8b, a key matrix circuit 85, A storage device (memory) 86, a slave unit charging circuit 87 for charging the slave unit from the power supply circuit 89, a current monitoring circuit 88 for monitoring the current of the charging circuit, and the like are provided. Reference numeral 80 denotes a charging terminal.

[0008] On the other hand, a cordless button telephone handset 8b
The wireless circuit 71 and the audio circuit 7 between the base unit 8a
2, a speaker 73, a microphone 74, a control device 75 for performing overall control, a key matrix circuit 76, a storage device (memory)
77, a charging terminal 80 of the parent device 8a, a charging terminal 70 of the child device side
A battery charging circuit 78 for charging the battery 79 with a current input through the power supply is provided. In addition,
Although not shown, the cordless button telephone handset 8b
Is set on the base unit 8a of the cordless button telephone when not in use. In this state, the charging terminal 80 of the base unit 8a of the cordless button telephone and the charging terminal 70 of the sub unit 8b of the cordless button telephone come into contact, and the charging current supplied from the sub unit charging circuit 87 on the main unit side causes The child device 8b is charged. The charging of the slave unit 8b of the cordless button telephone is performed by charging the battery 79 from the charging terminal 70 through the battery charging circuit 78. Normally, charging is performed with a current of about 200 mA.

On the parent device 8a side of the cordless button telephone, if a current is flowing by the above-described current monitoring circuit 88, if the child device 8b is mounted on the set (parent device), the current flows again. If not, it is determined that the slave 8b is not on the set. The operation of the present embodiment configured as described above will be described below. Now, the slave unit 8b is replaced by the master unit 8a.
If it is set above, it is assumed that there is an incoming call. This incoming call is detected by an incoming call detection circuit in the external line interface 2 of the main device 1, connected to a predetermined extension telephone (cordless button telephone), and becomes a ringing signal of the telephone. The base unit 8a of the connected cordless button telephone is
The wireless connection with the slave 8b is performed, but prior to that, the slave 8
b is charged to the current monitoring circuit 88 described above.
However, the current is reduced to a current (usually several mA) necessary for determining whether or not the slave 8b is on the set. When it is detected that the current has stopped flowing, base unit 8a of the cordless button telephone determines that the slave unit is off-hook. According to the present embodiment, power can be saved with a simple configuration, so that the main device 1 and the base unit 8a of the cordless button telephone can be easily reduced in size and weight.

In the above-described embodiment, an example has been described in which an operation for saving power is started when an incoming call is received.
Is monitored, and this information is sent to the control device 83. When this value becomes larger than a predetermined value, the control device 83 reduces the charging current as described above.
It is also possible to reduce the current to a level sufficient to detect off-hook. Further, in the above embodiment, the slave unit 8b
Has been shown on the set (master), whether or not it is determined by the current monitoring circuit 88 described above,
Instead of using the current, a voltage detection circuit may be used to make a determination based on a change in voltage. Note that the above embodiment is an example of the present invention, and it is needless to say that the present invention is not limited to this. For example, in the above-described embodiment, an example has been described in which the present invention is applied to a system including a plurality of cordless button telephones. However, the present invention can also be implemented for a general household or other cordless telephone. And so on.

[0011]

As described above in detail, according to the present invention, a cordless telephone or a system including the same can reduce the maximum current consumption without restricting the use. This has a remarkable effect that a telephone can be realized.

[0012]

[Brief description of the drawings]

FIG. 1 is a diagram showing a detailed internal configuration of a base unit 8a and a child unit 8b of a cordless button telephone in a system including a plurality of cordless button telephones, showing one embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a system including a plurality of cordless button telephones according to the embodiment.

FIG. 3 is a detailed diagram showing a connection state between main device 1 and a cordless keypad telephone base unit in FIG. 2;

[Explanation of symbols]

1: main unit, 2: external line interface, 3: line switch, 4: key telephone interface, 5: single telephone interface, 6: control device, 7: storage device, 8 and 9: cordless button telephone, 10: facsimile device , 8a: parent device of cordless button telephone, 8b: same device, 81: main device interface, 83: control device,
84: wireless circuit, 85: key matrix circuit, 87: slave unit charging circuit, 88: current monitoring circuit, 89: power supply circuit, 8
0: charging terminal, 71: wireless circuit, 75: control device, 7
6: key matrix circuit, 78: battery charging circuit, 7
9: Battery, 70: Charging terminal on the slave unit side.

Claims (2)

(57) [Claims] To 1. A base-side, it has a means for charging the handset,
The slave unit detects the current of the charging unit and sets the slave unit on the master unit.
In a cordless telephone configured to detect whether or not the
A cordless telephone , comprising: means for controlling a current supplied by said charging means to change to said detection current . 2. The base unit has means for charging the slave unit,
In a cordless telephone configured to detect whether or not a slave unit is set on the master unit by detecting a current of the charging unit , the cordless telephone other than charging the slave unit on the master side.
A cordless telephone, further comprising means for controlling the current supplied by the charging means to be changed to the detection current when the required current exceeds a predetermined value .