JPH0125036Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention uses two conventional two-terminal microphone plugs,
Stereo recording can be made using either a stereo microphone that uses a stereo plug, or a stereo microphone that uses a stereo plug.
This invention relates to a jack circuit that allows monophonic recording even with a microphone using a microphone plug with a terminal.

A conventional stereo tape recorder has a two-terminal microphone jack (mono jack) as shown in Figure 1.
was used as the left and right microphone input terminals. However, when using a stereo microphone equipped with a three-terminal microphone plug (stereo plug) that has recently appeared, only the channel that contacts the contact switch B connected to the output terminal A, for example, the left channel microphone, will operate (the second figure).

Also, some tape recorders are equipped with only a 3-terminal microphone jack (stereo jack) as a microphone input terminal, but even if you connect a microphone equipped with a conventional 2-terminal microphone plug to this tape recorder, it will not be connected to the dedicated output terminal A. Since the contact switch B that is connected is short-circuited to the ground C without contacting the contact portion 18 of the two-terminal microphone plug 16, no sound is produced (see FIG. 3). As described above, there has not yet been a tape recorder that can use both a two-terminal microphone plug and a three-terminal microphone plug.

The present invention was developed in view of the above points, and its purpose is to enable stereo recording using either two microphones that use a conventional two-terminal microphone plug or a three-terminal microphone plug. is possible,
Moreover, it is an object of the present invention to provide a jack circuit that can perform monophonic recording even with a single microphone using a two-terminal microphone plug, thereby providing compatibility with equipment.

A first embodiment of the present invention will be described below with reference to FIGS. 4 to 12.

1 and 2 are the first microphone jack and the second microphone jack, respectively.
It's a microphone jack.

Of these, the first microphone jack 1 has a first contact switch 4 connected to the output end 3 of the first channel, for example, the L channel (left channel).
and a first switch 6 connected to the output end 5 side of a second channel, for example, an R channel (right channel). Reference numeral 7 designates a second contact switch, and this contact switch 7 is connected to a third switch 12, which will be described later, inside the second microphone jack 2. Reference numeral 8 designates a receiving metal fitting for the first microphone jack 2, and this receiving metal fitting 2 is grounded 8A. A second switch 9 is turned on and off when the microphone plug is pushed in, and this second switch 9 is connected to ground 10.

On the other hand, the microphone jack 2 has a built-in contact switch 11 that communicates with the output end 5 of a second channel, for example, the R channel (right channel), and a third switch 12 that connects to the contact switch 7. Connected to ground 14. Reference numeral 16 denotes a two-terminal microphone plug formed of a hot-side contact portion 17 and a ground-side contact portion 18; 19 denotes contact portions 20 and 21 dedicated to the first channel and the second channel; and a grounded contact portion 22. This is a three-terminal microphone plug formed from the following.

One embodiment of the present invention has the above-mentioned configuration. First, when the two-terminal microphone plug 16 is inserted into the second microphone jack 2 as shown in FIG. Part 1
Since contact switch 11 contacts 7, 2
Input from the terminal-equipped microphone plug 16 is obtained from the output end 5 of the second channel. At the same time, the first switch 6 of the first jack 1 is connected to the output side 5 of the second channel.
is in contact with the microphone plug 16 with two terminals.
The input is obtained from the output end 3 of the first channel, and monophonic recording can be performed.

On the other hand, when the two-terminal microphone plug 16 is inserted into the first microphone jack 1 as shown in FIG.
Since the contact switches 4 and 7 are in contact with the contacts 7 and 18, the input from the two-terminal microphone plug 16 is brought into contact with the contact portion 17 and the first contact switch 6, and an output is obtained from the output end 3 of the first channel. In this case, the first switch 6 is separated from the first contact switch 4 and turned off, so that the output of the second channel is not transmitted. Also, since the second contact switch 7 is in contact with the contact portion 18, the input from the two-terminal microphone plug 16 is transferred to the third switch 1.
2 to the second output end 5,
Since the receiving metal fitting 8 comes into contact with the contact portion 18 and is grounded, the input from the two-terminal microphone plug 16 cannot be obtained at the output end 5.

This time, when the three-terminal microphone plug 19 is inserted into the first microphone jack 1 as shown in FIG. 7, the contact portion 2 of the three-terminal microphone plug 19
0, 21 are the first and second contact switches 4,
7 comes into contact with the contact portion 22, and the receiving metal fitting 8, which is grounded, comes into contact with the contact portion 22. For this reason 3
The input from the microphone plug 19 with terminal is connected to the contact part 2.
0, an output is obtained from the first output end 3 through the contact switch 4, and at the same time, an output is obtained from the second output end 3 through the contact section 21, the contact switch 7, and the third switch 12.
Output is obtained from the output end 5 of the , and stereo recording becomes possible. In this case, the microphone plug with 3 terminals 19
is inserted, the first switch 6 and second switch 9 are separated from the first and second contacts 4 and 7,
It turns off.

On the other hand, when the three-terminal microphone plug 19 is inserted into the second microphone jack 2 as shown in FIG.
Since the third contact switch 11 is brought into contact with the contact portion 20, input from the three-terminal microphone plug 19 can be obtained from the second output end 5, and at the same time, the first microphone jack 1 is connected to the second output end 5 side. Since the first switch 6 built in is connected and turned on, the input from the three-terminal microphone plug 19 is obtained as an output from the first output end 3.

Therefore, monophonic recording is possible (8th
(see figure).

In addition, two 2-terminal microphone plugs 16, 16
When the contact switch 4 is in contact with the contact portion 17 of the two-terminal microphone plug 16 inserted into the first microphone jack 1, the contact switch 4 is inserted into the first and second microphone jacks 1 and 2. The input from the two-terminal microphone plug 16 is obtained as an output from the output end 3 of the two-terminal microphone plug 1 inserted into the second microphone jack 2.
Since the contact switch 11 is in contact with the contact portion 17 of the second output terminal 5,
Input from the terminal-equipped microphone plug 16 is obtained as an output, allowing stereo recording. In this case, the first
The first switch 6 and the second switch 9 built into the microphone jack 1 are turned off when separated from the contacts 4 and 7. Therefore, the input from the two-terminal microphone plug 16 inserted into the first microphone jack 1 cannot be obtained as an output at the second output end 5. In addition, since the third switch 12 is separated from the contact switch 11 that is in contact with the contact part 17 of the inserted two-terminal microphone plug 16 inside the second microphone jack 2, the second microphone plug inserted into the second microphone jack 2 is The input from the terminal-equipped microphone plug 16 is not transmitted to the first output end 3 as an output (see FIG. 9).

Further, as shown in FIG. 10, when the three-terminal microphone plugs 19, 19 are inserted into the first microphone jack 1 and the second microphone jack 2, the three-terminal microphone plug 19 inserted into the first microphone jack 1 Since the contact switch 4 is in contact with the contact portion 20 of the microphone plug 19, the input from the three-terminal microphone plug 19 is obtained as an output from the first output end 3. At the same time, since the contact switch 11 is in contact with the contact part 20 of the three-terminal microphone plug 19 inserted into the second microphone jack 2, the input from the three-terminal microphone plug 19 is similarly input from the second output end 5. is obtained as output. Therefore, stereo recording is also possible in this case. In this case, the contact switch 7 contacts the contact portion 21 of the three-terminal microphone plug 19 inserted into the first microphone jack 1 and is turned on, but the three-terminal microphone plug inserted into the second microphone jack 2 is turned on.
3rd switch 1 by microphone plug 19 with terminal
2 is off, the 3-terminal microphone plug 19 inserted into the first microphone jack 1
The input from is not conducted to the second output terminal 5. Moreover, the first switch 6, the second switch 9, and the third switch 12 are turned off away from the contacts 4, 7, and 11, respectively.

Furthermore, as shown in FIG. 11, a three-terminal microphone plug 19 is inserted into the first microphone jack 1,
When the microphone plugs 16 with terminals are respectively inserted into the second microphone jack 2, the three-terminal microphone plugs 19 inserted into the first microphone jack 1 are inserted into the second microphone jack 2.
The contact section 20 of the microphone plug 16 has a contact switch 4 connected to the first output end 3, and the contact section 17 of the two-terminal microphone plug 16 inserted into the second microphone jack 2 is connected to the second output end 5. Since the contact switch 11 is in contact, the first and second
Microphone plug 1 with 3 terminals from output ends 3 and 5 of
9. Output is obtained from the two-terminal microphone plug 16, and stereo recording is possible.

Conversely, insert the two-terminal microphone plug 16 into the first microphone jack 1, and insert the three-terminal microphone plug 19 into the first microphone jack 1.
When the two microphones inserted into the first microphone jack 1 are inserted into the second microphone jack 2,
The contact part 17 of the microphone plug 16 with a terminal has a contact switch 4 leading to the first output end 3, and the contact part 20 of the three-terminal microphone plug 19 inserted into the second microphone jack 2 has a second contact switch 4 connected to the first output end 3. Since the contact switch 11 leading to the output end 5 is in contact with the
Outputs are obtained from the terminal-equipped microphone plug 16 and the three-terminal microphone plug 19, and stereo recording is possible. In this case, the third switch 12 is separated from the contact 11 and turned off, and the first switch 6 and the second switch 9 are connected to the contact switches 4 and 7.
It's off and on.

If neither microphone plug is inserted into the first or second microphone jack 1 or 2, the first microphone jack 1 has the first switch 6 connected to the contact switch 4 and the second switch 9 connected to the contact 7. Since the contacts 11 and 3 of the second microphone jack 2 contact each other and are turned on and grounded, and the third switch 12 contacts the contact 11 and is turned on and grounded, no noise is generated.

Shown in FIG. 13 is another embodiment of the present invention, in which a third,
The configuration is similar to that of the above embodiment except that the fourth output terminals 24 and 25 are provided, and the same effect is achieved.

As mentioned above, the present invention allows stereo recording using any of the conventional two-terminal microphone plugs, and it is also possible to use one microphone using a two-terminal microphone plug.
Compatibility of equipment can be achieved by making it possible to perform monophonic recording even with books.

[Brief explanation of the drawing]

Figure 1 is a side view showing an example of a conventional microphone plug with two terminals, Figure 2 is a jack circuit diagram showing a conventional example when a microphone plug with three terminals is connected to a microphone jack with two terminals, and Figure 3 is a side view showing an example of a conventional microphone plug with two terminals. is also 2
A jack circuit showing a conventional example when a microphone plug with a terminal is connected to a microphone jack with three terminals. Figures 4 to 12 show an embodiment of the jack circuit of the present invention. Of these, Figure 4 shows a microphone When no plug is connected, Figure 5 shows when a two-terminal microphone plug is connected inside the second microphone jack.
Figure 6 shows a case where a 2-terminal microphone plug is connected to the first microphone jack, Figure 7 shows a case where a 3-terminal microphone plug is connected to the first microphone jack, and Figure 8 shows a case where a 3-terminal microphone plug is connected to the second microphone jack. When a microphone plug is connected, Figure 9 shows a case where a two-terminal microphone plug is connected to the first and second microphone jacks, and Figure 10 shows a case where a three-terminal microphone plug is connected to the first and second microphone jacks. Figure 11 shows a 3-terminal microphone plug connected to the first microphone jack and a 2-terminal microphone plug connected to the second microphone jack. Figure 12 shows a 2-terminal microphone plug connected to the first microphone jack and a 3-terminal microphone plug connected to the second microphone jack. Indicates the case where the first
Figure 3 shows another embodiment of the invention. 1...First microphone jack, 2...Second microphone jack, 3...First output end, 5...Second output end, 4, 7, 11...Contact switch, 6
...First switch, 9...Second switch, 12...
...Third switch, 8A, 10, 14...Earth.

Claims (1)

[Claims for Utility Model Registration] A first microphone jack for the first channel, and a second microphone jack for the first channel.
a second channel microphone jack, and the first microphone jack contacts the first channel contact portion of the three-terminal microphone plug inserted into the microphone jack or the hot side contact portion of the two-terminal microphone plug, and The second microphone jack has a first contact switch that communicates with the output end of the first channel, and the second microphone jack has a first channel contact portion of a three-terminal microphone plug inserted into the microphone jack or a hot side contact of a two-terminal microphone plug. a third contact switch that contacts the output end of the second channel and that is turned off only when a microphone plug is inserted into the first microphone jack; The output side and the output side of the first channel are connected, and the first microphone jack is in contact with a second channel contact portion of a three-terminal microphone plug inserted into the microphone jack, and the microphone plug is inserted into the second microphone jack. a second contact switch that communicates with the output end of the second channel via a third switch that turns off only when the microphone plug is inserted into the first microphone jack; A jack circuit characterized in that the jack circuit is grounded via a second switch that is turned off only when the switch is turned off.