JPS6340864Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an input connection device that can connect an external device that operates by receiving power supply from a main device to a main device that does not have a power supply device.

Conventional configurations and their problems Currently, most tape recorder microphones are equipped with so-called built-in microphones, which have the microphone built into the housing, except for tape decks. If the sound source is far away or the sound source is low, it may not be possible to obtain a sufficient signal-to-sound isolation ratio against the noise and vibration of the motor and mechanical parts inside the tape recorder. A microphone connection terminal is provided, to which a corded external microphone can be connected for recording.

Among external microphones, dynamic microphones do not require a power source, but are difficult to make small and lightweight. On the other hand, electret condenser microphones have the advantage that their sensitivity and characteristics do not deteriorate significantly even when they are made small and lightweight, but they use elements that require a power source, such as field-effect transistors, for impedance conversion and amplification. Because of this, there is a limit to miniaturization, and handling is troublesome, such as being careful not to replenish batteries or forget to turn off the power switch. To solve this problem, power can be supplied from the tape recorder itself, but when connecting a microphone that does not require a conventional power supply or has a built-in power supply, the presence of this power supply terminal can cause problems and compatibility. As a result, a new connection terminal must be provided, which is inconvenient as it requires a location for installation and increases material costs.

Purpose of the invention This invention supplies power to microphones that require power from the main unit, and connects such types of microphones to main equipment that does not have a power supply device via an adapter. The purpose of the present invention is to provide a compatible input connection device.

Composition of the Invention The present invention provides an external connection device that operates by being connected to a first main device that is provided with a power supply circuit and an output load circuit for the external connection device, and a power supply and an output load circuit for the external connection device. This device is configured to be connected to a second main device that does not have a power supply circuit for externally connected devices by interposing an adapter with a circuit, so that externally connected devices can be connected to either the first or second main device. is also applicable.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, in FIG. 1, among the input connection terminals of the main device circuit 4 such as a tape recorder, 1 is the first input contact, 2 is the second input contact, and 3 is the third input contact.
This is the input contact of 5, 9 are capacitors, 6,
7 and 8 are resistors, 10 is a connection point from the first input contact 1 to the amplifier input circuit via the capacitor 5, 1
1 is a connection point from the third input contact 3 to the power supply circuit via resistors 6 and 7, and 12 is a connection point to the ground connected to the second input contact 2. A resistor 8 and a capacitor 9 are connected between the junction of the resistors 6 and 7 and the second input contact 2. Note that the resistor 6 may be another inductance. 13 is an electric condenser microphone, 14 is an electric condenser microphone unit, and 15 is a field effect transistor (FET). The output connection terminal 24 of this microphone is the first contact 2
When this output connection terminal 24 is inserted and connected to the input connection terminal, the first contact 21 is connected to the first and third input contacts 1 and 3, and the second contact 22 is adapted to be connected to the second input contact 2. The first and second contacts 21 and 22 are insulated with an insulator 23.

In the above configuration, the voltage from the power supply connection point 11 is divided by the resistors 7 and 8, and a voltage of, for example, about 1 to 3 V is applied between the connection between the resistors 6 and 7 and the ground, and this voltage is applied to the load. It is applied to the FET 15 via the resistor 6, the third input contact 3, and the first contact 21. The output of the electret condenser microphone unit 14 is applied to the FET 15, where it is amplified to provide an output across the resistor 6, which is connected to the third input contact 3, the first contact 21, the first
Input contact 1, input connection point 1 via capacitor 5
The signal is supplied into the main circuit 4 through a path leading to 0 and a path leading to a connection point 12 to ground via a capacitor 9, and is subjected to signal processing.

FIG. 2 shows the output connection terminal 24 when an external device other than the microphone that requires a power supply, such as a reception section of a wireless microphone, is connected to the input connection terminal, and 25 is a reception circuit, and 26
is a signal output/power supply terminal, 27 is a ground terminal,
These terminals 26 and 27 are connected to first and second contacts 21 and 22, respectively. By connecting this output connection terminal 24 to the input connection terminal of the main body, a power supply voltage is obtained from the main body to the signal output/power terminal 26 as in the case of FIG. Convey the output signal.

Next, FIG. 3 shows the case of a conventional microphone that does not require a power source. 28 is a dynamic microphone unit. In this case, the output connection terminal 24' is provided with a first contact 21' connected to the first input contact 1 and a second contact 22' connected to the second and third input contacts 2 and 3. , an insulator 23 is interposed between the first and second contacts 21' and 22'.

When this output connection terminal 24' is inserted and connected to the input connection terminal, the power is supplied from the connection point 11 through the resistors 7 and 6 to the third input contact 3, the second contact 22',
It is connected to the ground connection point 12 through the second input contact 2, so no power is supplied to the microphone unit 28, and only the electromotive force of the microphone is transmitted through the first and second input contacts 1 and 2. and is supplied to the circuit 4.

In this case, the power supply current may be instantaneously applied to the microphone unit while the output connection terminal 24' is being inserted, but the current limited by the resistors 6 and 7 may cause the microphone unit to overheat.
Care should be taken to set the value to a value that does not cause effects such as magnetization and destruction.

Next, if a microphone or other external device that supplies power from the main device is connected to the main device that does not have the conventional power supply capability, it will not work, so a solution to this problem will be described next. In this case, Figure 4,
An adapter 36 as shown in FIG. 5 is used. In FIG. 4, the output connection terminal 24' has a first contact 21' and a second contact 22' in contact with the second and third input connections, similar to that shown in FIG.
In addition, input contact 1 of the input connection terminal shown in Figure 1,
It has input contacts 31 and 32 of the same type as 2, and the input contact 31 is connected to the contact 21' via a capacitor 29.
The input contacts 32 are connected to the contacts 22', respectively.
A series circuit of a resistor 33 and a capacitor 30 is connected between the input contacts 31 and 32, and the resistor 3
A battery 34 is connected between the input contact 32 and the connection between the capacitor 3 and the capacitor 30 . Structurally, this adapter 36 has an input contact, a battery, etc. housed inside a housing 35 as shown in FIG. 5, and has contacts 21' and 2 at one end.
Although it is easier to handle by providing 2', the housing and contact 2
1' and 22' may be connected with a cord.

When using the adapter 36 shown in FIGS. 4 and 5, as shown in FIG.
The contacts 21 and 22 of the output connection terminal 24 of No. 3 are connected, and the contacts 21' and 22' of the adapter 36 are connected to the input contacts 1' and 2' of the main device circuit 4' which does not have the supply capability. It should be noted that it can be easily understood from FIG. 3 and its explanation that there will be no problem if it is connected as is to a main device circuit that has power supply capability.

The above explanation has been given for the case of a tape recorder as the main device, but this can also be applied to high/low frequency amplifiers, radios, etc. as long as the signal input is obtained from the outside. In addition to the exemplified microphone and wireless receiving section, the present invention can also be applied to a preamplifier and the like. In the case of a microphone, switching between the built-in microphone and the external microphone can be done by a conventionally known method (not shown), for example, by using another contact or a switch in response to the connection of the output contact to the first input contact. Just go.

Effects of the invention According to the invention, power can be supplied from the main unit to external equipment that requires power, and as a result, the external equipment is small and lightweight, and there is no need to replace batteries.
In addition, it has a simple configuration and excellent compatibility, such as the ability to connect to main unit circuits that do not have a power supply using an adapter, and its practical effects are great.

[Brief explanation of the drawing]

Figure 1 is a connection diagram of the first main unit and externally connected equipment, Figure 2 is a connection diagram of other externally connected equipment of the present invention, and Figure 3 is a connection diagram of the first main unit with externally connected equipment that does not require a power supply. Fig. 4 is a connection diagram showing an adapter in an embodiment of the present invention; Fig. 5 is a connection diagram showing the adapter in a connected state;
This figure is an external view of the adapter shown in FIG. 4, and FIG. 6 is a connection diagram of an embodiment using the adapter shown in FIG. 4. 1 to 3...Input contact, 4...Main device circuit, 1
0... Connection point to input circuit, 11... Connection point to power supply circuit, 12... Connection point to ground, 21, 22
...Contact, 24, 24'...Output connection terminal, 34
...Battery, 36...Adapter.

Claims (1)

[Scope of utility model registration request] An externally connected device that operates by being connected to a first main device that is provided with a power supply circuit and an output load circuit for the externally connected device is interposed through an adapter that has a power supply and an output load circuit for the externally connected device. An input connection device characterized in that the input connection device is connected to a second main device that does not have a power supply circuit for external connection devices.