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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a central longitudinal sectional view showing
one embodiment of the present invention, FIG. 2 is a perspective view showing its elastic
conductive contact piece, and FIG. 3 is another example of the elastic conductive contact piece 4
is a perspective view showing still another example of the elastic conductive contact piece, FIG. 5
is a sectional view showing a part of a microphone using the elastic conductive contact piece of
FIG. 3, FIG. The figure is a cross-sectional view showing a part of another example of the
microphone using another elastic conductive contact piece, FIG. 1 is a perspective view showing
a molded body of the pre-amplifying active element of the microphone of FIG. FIG. 8 is a
perspective view showing another example of the mold body of the pre-amplification active
element. 1 is a case (shield case), 3 is a diaphragm, 6 is a backgrate, 1 is a back plate mold, 8 is a
through hole which is an acoustic cavity, 12 is a directional hole, 13 is a through hole
constituting a directional hole, 14 is a through hole. Molded body of preamplification active
element, 15a, 15b and 15c are terminals derived from electrodes of the preamplification active
element, 18 is a printed circuit board, 19 is a slide bin, 20 is a closing head, 22 is a coil A spring,
23 is a push, and 24 is an elastic conductive contact piece. 1-FIG. 2 FIG. 3 FIG. 4 Kf: 2 (pz 4-66real open 51-84428 (3) FIG. 5 FIG. 6 FIG. 7 Fig. 8-67-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a micro 7 ono
suitable for use as an electrostatic type microphone such as an electret microphone or a
condenser microphone. In the conventional electret microphone or Conden's 1-inch 7-on, a
microphone capsule is attached to -11 of a shield couss consisting of a gold block on a cylinder,
and 1 ll! Tortoise effect non-transistor as 1 ml element The printed printed llV · J Ji substrate of
the circuit circuit element is provided on the other hand, the terminal is led out from the lower
surface of the micro 7 onocapillary, the field effect transistor A lead wire is used to connect
between the gate terminal of the above and the terminal of the microphone capsule by means of
a lead wire, and at its 7111 part, gold III # l is formed into a triangular cylinder shape t! It is
carried out by using a connecting piece and fitting this lid clasp connected to the lead wire
derived from the field effect transistor to the terminal of the microphone capsule. In such a
microphone, the II hardness of the field effect transistor and the microphone capsule is
complicated and is inconvenient for a single λ setting, and there is a possibility that the electriccontacting portion may be separated due to the movement of the external part. Also, in this case,
one having directional C single-finger identity) is formed by the bottom St-t-bunching of the
shield case to which the microphone cube is attached. It was of the structure provided with the
between-fingers hole opened in the shielding case of punching metal. In addition, in such
microphones, it was difficult to convert the microphones into non-directional ones by plugging
the one end of the directional hole with one end. Therefore, it was not possible to combine the
unidirectional microphone and the omnidirectional microphone t-. The first object of the present
invention is to obtain a microphone which is simple in structure, easy to assemble, easy to
automate its assembly, and reliable in electrical contact. The second object of the present
invention is that, in the microphone as described above, it is possible to reliably perform m @ m
between the back plate and the electrode of the pre-separating saponifier element to obtain a
highly reliable microphone. It is to be. The third object of the present invention is to provide a
directional microphone by providing a pointing hole with a simple structure in the abovementioned microphone. The microphone according to the present invention comprises a die 1
fram, a back plate disposed opposite to the diaphragm, and a molding 31 of a pre-amplifying
sewing element disposed on the surface of the heel opposite to the diaphragm of the backgrate. .
The body is transversely placed and housed in the case circle, and a part of the mold body is
formed with a hole serving as a part of a directional hole communicating with the outside of the
case. In the following, with reference to the wg1 figure, referring to the drawing tube, the present
invention microphone is a real Ml! t # JIK explained. FIG. 1 is a central longitudinal section ifI of
a microphone according to this dormitory. This is a cylindrical member shield case) made of Illll
Maesulminium etc.). (L 鳳) is its sound pickup direction, (lb) Fi its IT @ surface, +1 c) Fiji Iim
opening end. In this case il + sound collecting direction (1 m 3, for example, three sound
collecting holes + 21 arranged to be located at the apex of a triangle are bored. (31 is a case of a
grain case ...) A diaphragm (Electret F-modified molecular film) disposed via a diaphragm ring
(gold mass ring) (4) on the opposite side. The diaphragm t31Fi and the sound collecting direction
1113 of the case +11 are covered with a metal-coated tome m- by m-deposition of aluminum
deposition or the like. Reference numeral 16j denotes a cylindrical metal plate pack plate having
a necked -i1. Pack plate 16) C. Example 41: □ "□ If it is molded into a pack plate mold body
(insulator) (7) made of plastic such as polysulfone etc. And back L'-H61 ffi to hack plate mold
body +7+ non m is made the same plane. And a ring-like spacer (1! Like Mylar film). (II spacer)
+5) above-mentioned diaphragm (31, these back plates) + 6) and back plate mold body “7) so
that it interrogates each side of bank play) mold body ing. The back plate mold body (7) has a
cylindrical shape, and the mold body 171 has, for example, six through holes 18 for forming the
acoustic cavity Yr in a point called on the circumference centered on the central axis. It is
provided at equal angular intervals. The Ti theory is a non-woven / glossy tatami mat-like
resistance sheet, such as Babylon paper, which has its molded body (7: 7) so as to close each bite
of all the through holes I described above. It is pasted nine. For example, +91 is a cylindrical
acoustic resistance block made of plastic such as poly urethane. The four-sided acoustic
resistance block (9) is laminated downward in the above-mentioned mold body (FIG. 710).
rlG is a ring-shaped recessed groove formed at a position facing the above-mentioned ring-onacoustic-resistance sheet av of the acoustic resistance block 19). The lower half of the back plate
(6) described above is then fitted to the central through hole tc + a) K9 in the acoustic resistance
block 19). i! The acoustic resistance block (9;) is provided with a through hole 11j which is in
communication with a part of the above-mentioned link-shaped concave @ iα and which
constitutes -S of the directional hole α. For example, in the present embodiment, a mold
(insulated mold) of a field effect transistor, which also has a cylindrical shape, is stacked below
the acoustic resistance block (9). Oh, there is a hole (notch) (14a) as shown in FIG. This notch!
14al additionally squeezes in Tll and the aspect. The notch tx4a) L constitutes -m of the
directional hole sieve described above. Incidentally, in this molded body (14, (ISm), + 15b) and
(15c) are respectively used for the related amplification II! It is a terminal derived respectively
from the gate, source and drain of the field effect transistor which is a full-blown field effect
transistor. These terminals (15al, (15b) and 115c) are classified as ◆ genus, the molded body is
also projected ISK out of 4 and the terminals (15a) Fi and it protrudes from the upper ridge,
115b) and (15c) are It protrudes from the downward direction. Molded body α of the active
stack for Cl 4 Fi preamplification, and damage to the terminal K 51 for electrical KJI, particularly
the terminal (15a) from the input electrode of the performance-element of the power source It is
a conductive contact piece. Is this conductive contact piece? As shown in Fig. J # 'i @ 2, an Hshaped groove (24b) as shown is formed at the center of the metal right on a disc made of
copper plate etc. to form two contact tongues (24 m) The above-described terminal (15m) is
projected into the hole (6a) provided at the center of the lower end in the back plate 16 as shown
in FIG. While inserting a pair of tongue pieces 124a) and bringing this conductive contact piece
into contact with the backrest of the back plate 16), the ring-shaped brush B sheet (rubber sheet
12et-for pre-amplification [11 1) Flick JJ 1) on the field of the field of the stack. そして、これら
、パツクプ(7J! The conductive 118 piece (2) and the on-link cushion sheet a1ilYt are
pressed by the chi λ λ-rate 16) and the mold body a4.
a シ ー ル ド is a shield plate (metal disk) and is laminated on the lower side in the figure of the
molded body α 尋. This is provided because the lower end of the shield case Il + is open. And
that shield board α n 1 F) 8! In the lower part of the figure, the print base [111 is laminated in
the lower part of the history, and 10 m1 lc of the case Il + is folded over white ll I and tightened.
In this case, the printing base Ji- is also disk-shaped, and in that case, a conductive layer having a
pattern of 賜 Pk legs not shown is formed on the bottom surface soil. The above-mentioned glass
pieces 15b) and + 15c) are projected outside through the through holes t18a) till of the grid / t
substrate t1s. In addition, in the figure of the block body port ♦, 1 mK is a part where the layers
+ 15 b) and (15 c) are led out, and it is a through hole 117a) Km combined with shield @ a K K m
ing. Also, the ring is a ground electron that is mm in the print base jfll, and this farmland girl a @
is electrically softened to the key 1111 through the conductive layer on the print base fEa field
11). . Further, a portion KFi corresponding to the notch (x4a) K of the above-mentioned molded
body aJ of the shield case 111 and a number of holes (ld) are provided so as to be attached to the
shield. A directional hole is formed by the through hole (13, notch (14m)), and this directional
hole (13 makes this microphone to be a directional (unidirectional) microphone. Then, by closing
the through hole 10 II (13a), the microphone can be made a nondirectional microphone. ! ! A
sliding head a field having a closing head for closing a part of the finger hole action, in this
example, the opening weir 13a of the through hole 0, is provided with a sliding disk a in this
example. This slide bin α9 is a hole in the shield @ coffin (l? b) a slide pin slidably attached to a
bush {circle over (4)} made of a plastic (insulated body) such as a plastic wharf which is
demarcated and fixed to b). This slide bin 'lIt ;! The base 111 (19a) is provided on the base 11,
and the rubber disk-which is 91i rad is stuck on the above-mentioned blockage on the base @
(19a) of the disk shape. Further, the other filllK of the slide pin a9 is provided with a stopper ffl,
and a coil spring port is wound between the stopper 3 and the above-mentioned printed circuit
Then, the closing head 3 of the slide pink 9 is separated from the open end (13a) of the through
hole 0 by the wound blade of the coil spring 2. In this microphone, the sound frequency
goodness is determined by the mass of the diaphragm 131 and the sound volume of the through
hole 181 constituting the sound cavity. Also, the directivity hole Q3 has different sensitivities in
the low region of the sound depending on the magnitude of the acoustic capacity, and the volume
of the directivity hole I becomes large, the sound capacity becomes large, and the feeling of the
acoustic low region 1 goes up. Also, when the open end (13 m) of the through hole t13
constituting the pointing hole i13 is closed by the closing head 3, the pointing hole t1 is only the
through hole 0, whereby the volume is small Also, when the acoustic capacity goes down in
Europe and the microphone becomes directional, both K11 k values and attitudes can be
avoided! The rise in feeling of '-6 area is suppressed. When this microphone is used as a
unidirectional microphone, the slide bin α 1 is not suppressed, and if left as it is, the directional
hole 03 is delayed to the outside of the case 11; Become. In addition, when used as a
nondirectional microphone KFi, the slide bottle (19 t1-spring against the squeeze of a spring
squeeze against the squeeze of the closure head 3) into the through hole (the opening 111 (13a)
of 13 If this is pressed so as to close the book, it becomes a non-N directional microphone.
According to the microfoil mentioned above, Ichflaam and its back plate disposed
opposite to the earflam, and a front I amplification peristaltic pile disposed on the opposite side
of the diaphragm of the back plate. Since the child mold body is piled up and housed in the case,
the structure is simple and compact as a whole, easy to assemble, easy to automate assembly,
and easy to use with electrical contacts. A better microphone 1 can be obtained. Also, an elastic
conductive contact piece is interposed between the back plate and the mold body, and a terminal
FIj is connected to the electrode of the pre-amplifying active element electrically to the elastic
conductive contact piece The electrical connection between the backgrate and the electrode ICconnected terminal of the pre-amplification active element is easy in the assembly VC, and the
electrical connection is made. Be sure. In addition, as described above, since a hole serving as a
part of a finger hole to be delayed with the outside of the case is formed in a part of the mold
body of the front-end single-passing work piece. As a whole, it is easy to assemble, simple in
structure, and can easily be provided with a pointing hole in a 74-inch 7-con).
Furthermore, since a slide bin having an occlusion head that occludes a part of the pointing hole
is provided, it is possible to obtain a nondirectional and unidirectional microphone. In the case of
7316 in the case of the slide bottle, it is possible to close the pointing hole, but its unidirectionality and non-directional switching are both bulky and reliable. , You can suppress the
rise of low frequency in non-oriented. In the above example, a metal plate tube having a pair of
tongues (24a) as shown in FIG. 2 is used as a conductive contact (d), but as shown in FIG. The
metal plate may be a belt-like metal plate having a bending elasticity, or a dish-like elastic metal
plate as shown in FIG. For example, when using the conductive contact piece @ shaped like 8
shown in FIG. 3, the terminal shown in FIG. 5 is shorter than the terminal (15a) 1 which is 4 n
from the electrode of the active element. This conductive contact piece (241 'ft) may be disposed
between (lsa) and the direction of the back plate 16 without holes so that it can be held and
pressed. The case of using a dish-shaped conductive contact piece as shown in FIG. 4 is also
similar to FIG. As this elastic conductive conductive strip (d), the conductive rubber circle @YtR
as shown in FIG. 6 is used, and it is derived from the electrode of the pre-intensification 1 ili I
moving element and the tip terminal (15a) t-somewhat thick The conductive rubber circle @ Q4
may be valve-formed between the direction and the end face of the pack plate 161. .alpha.l port
1-.zeta., and also the hole (14a) Fi formed in the aSS forceps mold body for preamplification
mentioned above, and as shown in FIG. As a matter of course, it can also be constituted by a
through hole (14 m) not in communication with 1a @. Of course, the external longitudinal shape
of the microphone may be a prismatic shape instead of the cylindrical shape K11i described
above. Although the above-mentioned means for locking the slide bin 9 in a squeezed manner is
not provided in the microphone itself, for example, in the case of incorporating it as a built-in
microphone of this microphone tube tape recorder, the tape thereof The 7j of the recorder may
be provided with means for suppressing and locking the 1F bin, or releasing it.
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description, jps5184428
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