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JPS49929

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DESCRIPTION JPS49929
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram of a converter
according to an embodiment of the present invention and a connection box to which it is to be
connected, and FIGS. 2A and 2B are electric circuits showing other connection boxes. FIG. 1 ииииии
Headphones 2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и connection ... Matching transformer, 10... Input terminal,
11 .. input terminal, 12 a. Fig. 1 Row 1 1 1 1 1 1 1 1 1 2 1 2 3 17 17 t 3 Fig. 2 O q no Fig. 2
[Detailed Description of the Invention] This invention is! The present invention relates to a
transducer such as an microphone or a speaker, and more particularly to an electret transducer
provided with a pre-polarized electret on a diaphragm @, a fixed electrode side, or both.
?????????????????????????????? And three connection
terminals each composed of a pair of connection terminals respectively connected to the fixed
electrodes and a connection terminal connected to the diaphragm interposed between the fixed
electrodes. When this electret converter is connected to an amplifier K (1) ? 49-929-02 is
designed so that the amplifier may connect to another type of converter such as an electric m-rii.
If. ????????? It is necessary to connect through a connecting device (called a junction
box or the like) provided with a matching mechanism such as a matching transformer in order to
take a pinch. For example, a combination of an amplifier with an output terminal for connecting
an electromagnetic type headphone and a headphone of a nyretred type. The output terminal of
the amplifier is connected across the primary winding of the matching transformer, for example
the matching transformer. The connection terminal connected to the fixed pole of the t-headed
headphone is connected to both ends of the secondary winding of the matching transformer, and
the connection terminal connected to the diaphragm is connected to the middle-tuck of the
secondary winding. As a result, a voltage corresponding to the output signal of the amplifier is
generated between the fixed electrodes, and electro-acoustic conversion is performed by the
vibration of the diaphragm according to this voltage. On the other hand, a pair of connection
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terminals connected to the fixed pole is connected to one end of the secondary winding of the
matching transformer, and the other end of the secondary winding is connected to the
connection terminal connected to the diaphragm (2) 49 There are also connection devices which
are constructed according to the scheme K followed by-929-03--. There is also a connection
device in which a DC bias is applied to the diaphragm for general electrostatic capacitance
conversion without using a t-electret, and a power supply is inserted between the center tap of
the matching transformer and the diaphragm. In the case where a headphone configured to
connect to the connection device of the 2 method is erroneously connected to the connection
device of the 3rd method. It becomes K if a high DC voltage is applied to the diaphragm. There is
a risk of damage that can not be used again. The same thing can be said about the other
transducers such as not only headphones but also microphones etc. The purpose of the present
invention is to operate with the expected characteristics when connected to a connection device
configured according to a certain method Of course, when connected to a connection device
constructed based on other methods, it is of course to provide an electrified reflector 11 that is at
least not damaged.
The case where an embodiment of the present invention is applied to an electret type headphone
will be described with reference to the drawing. The headphone 49 shown in FIG. 1 is a pair of
fixed poles and 3 having an electret. The fixed electrode 3 and the diaphragm 3 are interposed
between the fixed electrode 3 and the diaphragm 3, and the fixed electrode 3 is a second
connection terminal tbK and the diaphragm 3 is a 3. Connecting terminal! aK Each of the working
fixed poles and 3 electrets connected to each other has charging surfaces of the same polarity
opposite to each other. That is, assuming that the surface of the electret of the fixed electrode
facing the diaphragm 41 is positively charged, the surface of the electret of the fixed electrode 3
facing the diaphragm of the electret is also positively charged. A capacitor C having an
impedance sufficiently smaller than the signal current supplied to the diaphragm is inserted
between the diaphragm holder and the connection terminal je. Also, a connection box is shown to
which the headphones of the code atf and jin are connected. This connection box 6 comprises a
matching transformer t with a primary winding f and a secondary Sag, and is connected to the
primary ? ? 7 Fi, the input terminal 10 to be connected to the output terminal of the amplifier
and /// e 41.1 = 49-929-05 Further, one end of the secondary winding t is connected to the
headphone / (D first connection terminal jaK, the output terminal lco aK, the other end of the
secondary winding I is Output terminal / J) K connected to the second connection terminal jt +!
The intermediate taps of the missing at are connected to the output terminals lK and cK
connected to the connection terminals jaK, respectively. When the headphone 1 configured like a
hem and the connection base are connected, the diaphragm rod vibrates according to the signal
between the fixed electrode core 3 and 3. FIG. 2m shows a connecting device / J configured
according to another scheme. In this connection box / 3, the intermediate tap of the secondary
winding 1st of the matching transformer is omitted, and both the output terminals lcoa and lcob
# i are connected to one end of the secondary line @ 1, and the output terminal lcoC Is connected
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to the other end of the secondary winding l. Then, if the headphone l shown in FIG. The signal
voltage is supplied from one end of the secondary winding ag to the diaphragm through the
capacitor C, and is supplied from the other end to the fixed electrode co, JK. And, since the
capacitor C has an impedance (5) 49-929-08 that is sufficiently small with respect to the signal
current flowing therethrough, substantially no inconvenience due to the interposition of the
capacitor C occurs. The headphones to be connected to the connection device shown in FIG. 1 are
identical in construction to the headphone I of FIG. 1, but the fixed poles and J electrets face each
other. It is charged to the opposite sign.
The connecting device 13 shown in FIG. 2Bltc is configured to connect an electrostatic type
headphone of a system for applying a DC bias to a diaphragm without using an electret, and
includes an intermediate tap of the matching transformer t and an output terminal l. Between the
point C and the point C, a DC polarization gIP and a holding resistance R are inserted. This
connection device / JK When connecting any of the headphones as described above, since the
capacitor 0 is inserted between the connection terminal to and the diaphragm d, the Il moving
plate 4 IKIl! There is no flow of L current and m moving plate is not damaged. [KFi for singleelectret headphones. The diaphragm rod moves in response to the signal between the fixed pole
core 3 and 3 in response to the signal between the fixed pole core 3 and 3 to fully function as a
converter. As described above, according to the present invention For example, even when
connecting to a connecting device configured based on 41 in a different manner, being damaged
has an excellent effect that the force <, the predetermined operation can be performed. Accidents
caused by WIA connection can be prevented in advance.
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