JPH0419734B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] In order to connect a handset consisting of a carbon type handset and an electromagnetic type handset to a telephone equipped with a handset of ceramic type, capacitor type, etc. A connection position having a current supply section and a level conversion section is provided.

[Industrial application field]

The present invention relates to a telephone with a replaceable handset, in which a handset consisting of a carbon type handset and an electromagnetic type handset is connected to a telephone main body to which a handset such as a ceramic type or a capacitor type is connected. This is related to the installation of a handset connection.

[Conventional technology]

Generally, the telephone body and the handset are connected by a cord, but a configuration in which the handset can be replaced by a plug or the like is widely used in the United States and other countries. For example, FIG. 3 shows an example of a telephone with a replaceable handset.
11 is a telephone main body, 12 is a handset, 13 is a transmitter, 14 is a receiver, 15 is a plug, 16 is a push button dial, 17 is a headset, 18 is a transmitter, 19 is a receiver, and 20 is a plug. Handset 12 and headset 17 are connected to plug 1.
5, 20 can be easily replaced.
Also, the handset 12 can be easily replaced with a favorite color.

Further, the transmitters 13 and 18 are carbon type, and the receiver 14,
19 is generally an electromagnetic type, but recently,
As is known from ceramic or capacitor microphones using ceramic piezoelectric elements, telephones equipped with capacitor-based handsets have come into use. These handsets can be made lightweight.

[Problem that the invention seeks to solve]

For telephones equipped with ceramic or capacitor-type handsets other than carbon-type handsets or electromagnetic handsets, the current supply is limited because the ceramic or capacitor-type handsets are voltage-driven. It has no functionality. Therefore, even if a handset consisting of a carbon type transmitter and an electromagnetic type handset is connected to the main body of the telephone, current is not supplied and the impedance matching is not sufficient, so it cannot be used. .

Also, a carbon type transmitter 18 and an electromagnetic type receiver 19
Some headsets 17 equipped with an amplifier are also known, and even in that case, when connected to a telephone equipped with a ceramic or capacitor type handset, no current is supplied to the amplifier. , cannot be used.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to connect a handset made of a carbon type handset and an electromagnetic type handset to a telephone equipped with a handset of a ceramic type, a capacitor type, or the like.

[Means for solving problems]

The handset connection device of the present invention connects a handset consisting of a carbon type handset and an electromagnetic type handset in a telephone equipped with a voltage-driven handset having a configuration other than a carbon type handset and an electromagnetic type handset. It is provided with a current supply function and a level conversion function so that it can be connected, and will be explained with reference to FIG. In place of a telephone handset that is equipped with a voltage-driven handset that operates without receiving current supply from the telephone main body 1,
A device 5 for connecting a handset 4 consisting of a carbon-type handset 2 and an electromagnetic handset 3 to a telephone main body 1, which supplies current to the carbon-type handset 2 of the handset 4. Supply section 6 and this carbon type transmitter 2
a first level converter 7 that performs level exchange between the telephone body 1 and the telephone main body 1; and an electromagnetic receiver 3 of the handset 4.
and a second level converting section 8 that performs level exchange between the telephone main body 1 and the telephone main body 1.

[Effect]

From the current supply section 6 of the connection device 5 to the carbon type transmitter 2
Since current is supplied to the telephone body 1, the carbon-type transmitter 2 can be used to transmit calls even if the telephone main body 1 does not have a current supply function. Furthermore, the level exchange parts 7 and 8 allow impedance matching between the handset 4 consisting of the carbon type transmitter 2 and the electromagnetic type handset 3 and the telephone main body 1.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a main circuit diagram of an embodiment of the present invention,
R1 to R11 are resistors, C1 to C3 are capacitors,
Q1 and Q2 are transistors, and OPA is an operational amplifier. Corresponding to the configuration shown in Figure 1, the resistance R
3 and R4 constitute a current supply section 6 for the carbon-type transmitter 2, and a current for operating the carbon-type transmitter 2 is supplied by the voltage +V. Also, resistors R1 and R2
and capacitor C1 constitute a level converter 7, and by selecting resistors R1, R2 and capacitor C1, the output level of carbon type transmitter 2 is converted to match the telephone main body 1.

Also, operational amplifier OPA and transistors Q1, Q2
The level conversion unit 8 in FIG. 1 is configured by the configuration including the above. The + terminal of this operational amplifier OPA is grounded, and the - terminal is connected to the capacitor C2.
A signal voltage from the telephone body 1 is applied via the resistor R5 and the resistor R5. The output signal of operational amplifier OPA is applied to the base of transistor Q1 via resistor R7 and to the base of transistor Q2 via resistor R8. These transistors Q1 and Q2 are of the pnp type and pnp type, and perform complementary operations to drive the electromagnetic receiver 3 via the capacitor C3.

A power supply with a small capacity that can supply the operating current of the carbon-type transmitter 2 and the operating currents of the operational amplifier OPA, transistors Q1, Q2, etc. is sufficient;
The power supply voltage +V can be supplied from a battery or from a commercial power supply via an adapter including a rectifier circuit or the like.

〔Effect of the invention〕

As explained above, the present invention provides a telephone main body 1 to which a ceramic type or capacitor type handset having a configuration other than the carbon type handset 2 and the electromagnetic type handset 3 is connected. In order to connect a handset 4 consisting of a carbon type handset 3, a carbon type handset 2 is connected.
a current supply section 6 that supplies current to the telephone main body 1;
A first level conversion section 7 consisting of resistors R1, R2, a capacitor C1, etc. that performs level conversion between
and an operational amplifier OPA and transistor Q that perform level conversion between the electromagnetic handset 3 and the telephone body 1.
1, Q2, etc., and a user who already has a headset etc. consisting of a carbon type transmitter 2 and an electromagnetic type handset 3 can use a ceramic type or capacitor type head set. When a telephone equipped with a handset, such as a type, is purchased, the headset can be used by using the connecting device 5, which has a relatively simple configuration.

[Brief explanation of drawings]

FIG. 1 is a basic block diagram of the present invention, FIG. 2 is a circuit diagram of a main part of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of a telephone set. 1 is a telephone body, 2 is a carbon type transmitter, 3 is an electromagnetic type receiver, 4 is a handset, 5 is a connecting device, 6 is a current supply section, 7 and 8 are level converters, R1 to R11
is a resistor, C1 to C3 are capacitors, OPA is an operational amplifier, and Q1 and Q2 are transistors.

Claims (1)

[Scope of Claims] 1. In place of the handset of a telephone equipped with a voltage-driven handset that operates without receiving current supply from the telephone main body 1, a transmitter consisting of a carbon type handset 2 and an electromagnetic type handset 3 is provided. A device 5 for connecting a handset 4 to the telephone body 1, comprising: a current supply section 6 for supplying current to the carbon-type transmitter 2 of the handset 4; and the carbon-type transmitter 2.
and a second level converter 7 that performs level conversion between the electromagnetic handset 3 of the handset 4 and the telephone main body 1. A handset/receiver connection device comprising a section 8.