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■ Power supply switch circuit for microphones requiring power supply 0 Japanese Patent
Application No. 44-105238 [Phase] Application No. 44 (1969) December 29 @ Inventor Masaaki
Sato Hachioji City 130 Teradamachi Applicant Olympus Optical Industrial Co., Ltd. Tokyo
Shibuya-ku Tsujigaya 2 of 43 2 [presence] embedded buried attorney Atsushi Sugimura 1 outside
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram in which the switch circuit of
the present invention is connected to a tape recorder, FIG. 2 is a perspective view showing one
embodiment of a microphone plug according to the present invention, and FIG. FIG. 6 is an
enlarged vertical sectional view showing a state where a microphone plug is inserted into a
corresponding jack of a tape recorder.
Detailed Description of the Invention The present invention is a microphone power switch circuit,
which requires a power supply! The present invention relates to a switch circuit including a JP1
tecapacitor type or ceramic type microphone and a field effect transistor to turn on / off a power
supply for driving the field effect transistor. The manual impedance of a microphone circuit of a
tape recorder or the like using transistors in the middle stage is at most several kilohms.
Therefore, in the past, dynamic or magnetic microphones having matching impedance values
were conventionally used, instead of such microphones, small and inexpensive capacitor or
ceramic microphones (hereinafter referred to as capacitor microphones). ) Has been developed.
However, in the case of such a capacitor type microphone, when the impedance is low, the signal
in the low frequency region is cant, so the human power impedance is increased to several
meghomes and the one [111111] sword impedance is a transistor. It is necessary to lower the
impedance to match the human impedance of the microphone circuit, and for this purpose, it is
preferable to use a transistor having a high input and low output impedance, that is, a field effect
transistor. There is no problem when the above-mentioned condenser type microphone is
incorporated in a tape recorder, but when this microphone is not incorporated in a tape recorder
and used as an external microphone, various problems occur. That is, in order to make it possible
to use such a microphone in an ordinary tape recorder having an input impedance of 1 to several
kilohms, the output impedance of this microphone is made equal to the input impedance of the
microphone circuit of the tape recorder. The field effect transistor and the condenser microphone
need to be placed in the same case because they need to be placed close to each other so as not
to cause oscillation. A small silver or mercury battery or AAA battery can be used as a power
supply of the capacitor type microphone, that is, a power supply for driving a field effect
transistor. Such a battery does not have a switch because the power consumption of the field
effect transistor is extremely low, and it can be returned as an always usable connection state,
but the battery is prevented from being consumed when not in use, and its lifetime is
semipermanently For this purpose, it is desirable to provide a switch for the battery in the
microphone device and to shut off the power supply when the microphone device is not in use so
that the battery can be used semipermanently.
However, in the case of providing the above switch ヲ microphone device, it is necessary to pay
attention to the on / off of the switch, so that recording errors due to forgetting to turn on such a
switch easily occur. Automatically turns on / off the power of the microphone [111111]
EndPage: 1 when removing it from the network, and requires a power supply of the abovementioned type appropriately configured and arranged so as to satisfy all the requirements
described above. To provide a microphone power switch circuit, 811 Le. The invention will be
described with reference to the drawings. The power switch circuit diagram of the microphone of
the present invention shown in FIG. 1 is as follows: 1 is a condenser type microphone, 2 and 3
are resistors, 4 is a field effect transistor, 5 is a microphone case 6 is a microphone outlet plug, 7
is a microphone A battery serving as a power source of the field effect transistor 4, an input junk
8 attached to a tape recorder, a plug 9 fitted with a tape recorder motor slot jack 10c, and an
amplifier unit 11 are shown. In order to make the drawing clear, the second F amplifier unit 11
shows only the first stage transistor input portion, and the other omitted the field effect
transistor 4 only performs impedance conversion, so the current consumption is It is several tens
of μA or less, and the voltage is sufficient at about IV. Therefore, as the battery 7, a relatively
easy small one such as a silver or mercury battery or AAA battery can be used. Reference
numeral 12 denotes a power source S of the tape recorder, a main switch 13, a motor 13 and a
connection cord 14 comprising three lead wires. FIG. 2 shows a microphone plug main body
constituting the switch circuit of the present invention, and 15 shows a plastic molded plug main
body having a microphone outlet plug 6 and a remote switch plug 9. 3 shows the microphone
plug body 1 of FIG. 2 inserted into the corresponding junk of the tape recorder, where 16 is the
conductive inner shaft of the output flag 6 of the microphone and 17 is the conductive outer
surface of the output plug 6 Shows a tube. The inner shaft 16 and the outer tube 11 are
electrically isolated from each other by the insulating tubes 18 and 19. The input junk body 20 is
attached to the tape recorder's cake wall 21 with a NAND 22. The end of the inner shaft 23 of
the remote switch plug 9 has an insulator 24 attached, and the other end of the inner shaft 23 is
surrounded by an insulating tube 25, and the conductive outer tube 26 is inside the insulating
tube 25. It arranges so that the whole axis 23 may be enclosed.
The substrate 27 of the remote switch plug 9 rc corresponding insulator is fixed to one of the
tape recorders. Attached to the insulating substrate 27 is a conductive thin tube 28 in which the
inner shaft 23 of the planar [11111119 is fitted. Furthermore, a switch piece 29 formed of an
elastic conductor is also fixed to the insulator substrate 21 and the conjugate sections 30 and 31
of the switch piece 29 are brought into contact with the outer tube 26 of the plug 9. Contact with
28. The lead wire 32 of the electrical cord 14 connected as the drain of the field effect transistor
4 via the resistor 3 is soldered to the outer tube 17 of the outlet cab 6, and the lead wire 33
directly connected to the drain of the field effect transistor 4 is released. Solder to the inner shaft
16 of the cover 6 and solder the negative terminal of the battery 7 to the inner shaft 23 of the
plug 9 and further connect the outer tube 17 of the plug 6 and the outer tube 26 of the plug 9
By connecting with the lead wire 44, when inserting the plug body 15 into the tape recorder jack,
a closed circuit is formed through the inner shaft 23, the thin tube 28, the switch piece 29, the
conjugate portion 30, 31 and the outer tube 26; The current of the battery 7 should conduct.
That is, power can be supplied from the battery γ to the field effect transistor 4 only when the
microphone plug body 15 is inserted by using the conduction of the switch of the remote jack. In
the case of using a low impedance microphone other than a condenser microphone, a
conventional remote control can be used since a power supply for an electric field effect type 5
transistor is not required, and in this case, the remote plug 9 is shown in FIG. The length of the
inner shaft 23 or the insulator 24 ′ ′ (so that when the switch 10 is inserted into the jack 10,
the switch piece 29 is pushed to separate the switch 0 piece 29 from the conductive thin tube
28). A plug body having a plug may be used. It is apparent that the switch mechanism of such a
remote jack 10 is not limited to the above-described example, and may be modified. In addition, it
is preferable that, for example, plastic molding be carried out together with the main body 15 so
that the parts of the out-coming plugs 6 and 5 remote plugs 901 and the parts of the relays 132
to 34 connecting these are embedded in the plug main body 15 is there. The power switch circuit
of the microphone of the present invention is configured to automatically turn on / off the power
of the microphone when removing the microphone plug from the tape recorder by using the
switch of the remote jack of the microphone. It is possible to use the battery semipermanently by
inserting the battery IV and to achieve the purpose by almost using the [111111] EndPage: 2
existing remote connector so that it can be made extremely inexpensive and compact.
Further, since the condenser type microphone and the field effect transistor are accommodated
in the vicinity of each other in the microphone case, undesired oscillation does not occur. More
recently, there has been a demand for a miniature tape recorder that can be incorporated into a
pokesotic, and in order to miniaturize it, some speakers and output amplifiers have been omitted,
and some have been heard on earphones. Use a power amplifier and an extension speaker with a
battery. Since this power supply is irrelevant to the main switch of the tape recorder, the switch
to the extension speaker is less likely to forget to turn off when not in use. If this invention is also
used, it is normal for the extension speaker to be separated from the tape recorder when not in
use, so it is a safety device for wasteful consumption of the W1111111 pond.
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