JPH0711040U - Cordless phone - Google Patents

Abstract

(57) [Abstract] [Purpose] A cordless telephone in which a master unit and a slave unit are wirelessly connected to each other, and it is possible to reliably know that a call has been made even if it is far from the master unit. Provide a telephone. [Structure] An independent speaker unit 4 wirelessly connected to the master unit or the slave unit is provided separately from the slave unit, and the speaker unit is activated by receiving a call command signal transmitted from the master unit or the slave unit to the speaker unit 4. The receiving circuit 6 is built in.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cordless telephone having a master unit directly connected to a public line and a slave unit wirelessly connected to the master unit.

[0002]

[Prior art]

 As is well known, a cordless telephone has a master unit directly connected to a public line and a slave unit wirelessly connected to the master unit, as disclosed in Japanese Patent Laid-Open No. 1-235442. Therefore, even if the child device is located away from the parent device, the child device is connected to the public line via the parent device to enable a call.

[0003]

[Problems to be solved by the device]

 Therefore, in the above cordless phone, if multiple cordless handsets are placed in multiple locations away from the base unit, even if people are working or doing housework far away from the base unit, these The call signal is sent wirelessly to the handset and the ringing tone is emitted, so there is no problem in the call.

However, since the above-mentioned slaves are expensive because they have a built-in circuit including a microcomputer for transmitting / receiving signals to / from the master, a plurality of such slaves are included in an unspecified number. It is economically impossible to leave it in place.

Therefore, an object of the present invention is to provide a cordless telephone capable of surely making a call at a place far away from a base unit without using an expensive handset.

[0006]

[Means for Solving the Problems]

 That is, the present invention is a cordless telephone having a master unit directly connected to a public line and a slave unit wirelessly connected to this master unit. It has an independent speaker unit that is wirelessly connected, and this speaker unit is provided with a receiving circuit that receives a call command signal transmitted from a master unit or a slave unit and operates the speaker. .

[0007]

[Action]

 According to the above configuration, the speaker unit, which does not have the call function and is provided only with the function to emit the ringing tone, is wirelessly connected to the master unit or the slave unit. It only needs to include a simple receiving circuit for call command signals including.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cordless telephone 1, which includes a master unit 2 directly connected to a public line and a slave unit 3 wirelessly connected to the master unit 2 and connected to the public line via the master unit 2. In addition to the above, a plurality of speaker units 4 to 4 are provided separately from the slave unit 3.

In that case, as shown in FIG. 2, each speaker unit 4 to 4 has a built-in antenna 5 and a receiving circuit 6 for wirelessly receiving a call command signal from the base unit 2, and the receiving circuit 6 has a speaker 7 that emits a ringing sound, a power supply circuit 8 for operating the speaker 7 in response to the received call command signal, and a speaker drive circuit 9. The power supply circuit 8 may be a battery built in the speaker unit 4 or an AC converter using a commercial power supply.

In such a cordless telephone 1, if the speaker units 4 to 4 are installed in a remote place where the ringing sound directly emitted from the parent device 2 cannot be heard, when the telephone call is made, the parent device is called. Since the speaker drive circuit 9 is driven by the call command signal sent from the speaker 2 and the ringing sound is emitted from the speaker 7, it is possible to know the call reliably even if it is far from the base unit 2. Since the speaker unit 4 provides only the sounding function of the ringing tone, the circuit configuration of the speaker unit 4 is simple, and the use of an expensive microcomputer or the like can be eliminated. It is possible to provide an inexpensive cordless telephone 1 while having a calling function to a place.

It should be noted that the present invention can be used not only for calling an outside line but also for calling an extension line. Further, as shown in FIG. 3, the slave unit 3 is provided with a transmission circuit 10 capable of transmitting an electric wave received by the reception circuit 6 of the speaker unit 4, and the transmission circuit 10 receives the calling command signal A from the master unit 2. If the call command signal B is issued to the speaker unit 4 when received at 11, each speaker unit 4 can be arranged as far as possible within the reach of the radio waves A and B.

[0013]

[Effect of device]

 As is clear from the above description, the present invention wirelessly connects the speaker unit, which does not have the call function but only the function of producing the calling sound, to the master unit or the slave unit. The unit only needs to have a simple reception circuit for the call command signal, including the speaker drive circuit. Therefore, by installing the speaker unit at a distant place, it is possible to inexpensively provide a cordless telephone capable of reliably transmitting a call to the distant place.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a cordless telephone according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a speaker unit in the cordless telephone.

FIG. 3 is a schematic view of a cordless telephone according to another example.

[Explanation of symbols]

 1 cordless telephone 2 base unit 3 slave unit 4 speaker unit 6 receiving circuit 7 speaker

Claims (1)

[Scope of utility model registration request] 1. A cordless telephone having a master unit directly connected to a public line and a slave unit wirelessly connected to the master unit, which is wirelessly connected to the master unit or the slave unit separately from the slave unit. A cordless telephone having an independent speaker unit, and a receiving circuit for activating a speaker by receiving a call command signal transmitted from a master unit or a slave unit in the speaker unit.