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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a central sectional view showing an
embodiment of the present invention, and FIGS. 2, 3 and 4 are top views of the acoustic
resistance block of the microphone of FIG. 1, respectively. 1, a central longitudinal sectional view
and a bottom view, FIG. 5 is a perspective view showing a molded body of the pre-amplifying
active element of the microphone of FIG. 1, and FIG. 6 shows elastic conductive contact pieces of
the microphone of FIG. FIG. 7 is a perspective view showing another example of the elastic
conductive contact piece, FIG. 8 is a perspective view showing still another example of the elastic
conductive contact piece, and FIG. 9 is the elastic conductive of FIG. FIG. 10 is a sectional view
showing a part of a microphone using a contact piece, FIG. 10 is a sectional view showing a part
of another example of a microphone using another elastic conductive contact piece, and FIG. FIG.
12 is a perspective view showing another example of the mold body for the width active element,
and FIG. 12 is still another example of the mold body for the pre-amplification active element Is a
perspective view showing a. Reference numeral 1 is a case (seed case), 3 is a guillagram, 6 is a
back plate, 1 is a backpre-1 mold, 8 is an acoustic cavity through hole, and 13 is a passage
through hole Through hole, active body of ICd two pre-amplification active elements, 15a, 15b
and i5 e are terminals derived from electrodes of pre-amplification active elements, 1 B is a
printed circuit board, and i9 U closing head 1 'pin, 20 is a rod, a disc, 24 is an elastic conductive
contact piece. 1-1-51-1.2529 2 (2) Figure 1 Figure 2-102-5 1-125 529 (3) Figure 3 Figure 5
Figure 4 Figure 6 Figure 7 Figure 8 Taya \. l Fig. 103 actual opening 51-425929 (4. 11) and 12).
DETAILED DESCRIPTION OF THE INVENTION The invention applies to microphones such as
electret microphones, condenser microphones and the like (shaped microphones suitable for
application to microphones Kp. A conventional microphone microphone or condenser
microphone has a microphone capsule attached to a part of a shield case that is metal-bonded on
one cylinder, and a field effect transistor as a pre-amplification active element, and the like in a
portion of the shield case The necessary circuit elements are attached and nine print (1)-1 groups
are thrown, while the terminal is led out from the lower surface of the microphone capsule, and
between the gate output terminal of the field effect transistor and the terminal of the microphone
capsule No. K for connecting lead with lead wire In this connection part, using a metal selvage
formed in the shape of a triangular cylinder II, this lead wire connected from the field effect
transistor is connected. It was carried out by inserting it into the terminal of the metal shell
microphone capsule. In such a microphone, the connection between the field effect transistor and
the microphone capsule is complicated, and the structure is inconvenient for cleaning, and the
electrical connection portion is separated by the external vibration. In addition, this one with
directivity (unidirectionality) is formed of the bottom part of the shield case with the microphone
capsule attached at one end thereof, and this hunting metal. The inside of the shield case has a
structure in which a directional hole for Vc opening is provided. Also, with such a microphone, it
was difficult to convert the microphone into an omnidirectional one by closing the open end of
the stoma to its pointing (811, therefore, single pointing It should not be possible to combine a
sexual microphone and an omnidirectional microphone. The purpose of the l @ l of the present
invention is to obtain a microphone having a simple structure, easy assembly, easy automation of
assembly, and high reliability of the electrical contacts. The second object of the present
invention is that, in the microphone as described above, the connection between the back plate
and the polarization of the preamplification active element can be reliably made in history, and a
highly reliable microphone can be obtained. It is to be. The third object of the present invention
is to provide a pointing hole with a simple structure in the microphone as described above. The
goal is to get a directional microphone. The fourth object of the present invention is to obtain a
microphone having easy directivity characteristics, easy design of directivity characteristics, no
deviation of directivity patterns, and easy switching between directional and non-directional
13) 3'-1 '] Hereinafter, one embodiment of the microphone according to the present invention
will be described in detail with reference to FIG. 1 and one drawing. FIG. 1 is a central
longitudinal cross section of a microphone according to the present invention. (11 is a case (a
metal shield case made of aluminum or the like), which has a cylindrical shape. (Ill) is its sound
collecting surface, (lb) # 'i its aspect, (le) is the bottom s opening edge. In the sound collection
surface (la) of this case il +, for example, three sound collection holes (2) arranged to be located
at the apexes of a triangle are bored. (3) The sound pickup surface of this case il + (1 m) is
opposed to IIIK. Diapram ring (metal ring) (4) is a diaphragm (electretized polymer film) disposed
via the ring. A metal conductive layer is formed on the entire surface of the sound collection
surface (ta) 111 of the diaphragm + 31 ti 11 in the case fi + by evaporation of aluminum. (6) is a
bank plate made of a cylindrical metal with a partial constriction. This pack plate (6) is inlaid by a
back plate mold body (1P, rim) made of plastic such as polysulfone, etc. (71-v: field). The surface
of the pack (4) and the surface of the pack plate mold body ()) are made flush with each other.
Then, like the Mylar film, the ring-shaped space + (diaphragm 13 to be described above through
the insulation X + (5)) faces the surfaces of the pack play + 61 and the bank plate mold body +
71. , And the periphery of the surface of the bank plate mold body 17). The pack plate mold body
(7) has a cylindrical shape, and the mold body (7) has, for example, six holes (8 holes) for
forming an acoustic cavity point-symmetrically on a nine-circle question centering on the central
axis. ) Are provided by self-interval. + 111 is a ring-shaped acoustic resistance sheet made of nonwoven fabric such as Babylon paper, which is attached to the mold body (71) so as to close the
opening edge of all the through holes (8) described above It is done. (9) is a cylindrical acoustic
resistance block made of plastic such as polysulfone. The acoustic resistance block (9) is
laminated downward at the time of the mold body (7) described above. II * is a nine-ring concave
groove formed on the ring of the acoustic resistance block (9) at a position IC facing the acoustic
resistance sheet (5) wall αυ.
The lower half portion of the above-mentioned pack plate (6) is fitted to the through hole (9 m) K
at the center of the acoustic resistance block (9). Further, I / C, this acoustic resistance block (FIG.
2, FIG. 3 and FIG. 4 show the top view thereof and the vertical cross section wIfBAP bottom view
is top view respectively) + 91 K A through hole (directing hole) 61 is provided at the back of the
microphone for communicating with a part of the microphone. I is an active element for preamplification, for example, a mold (insulation layer-field body) of a field effect transistor in this
example, and is united so as to be tucked below the acoustic resistance block (9) to obtain a
series +1 E51! As shown in @l, the cylinder has a semi-cylindrical shape provided with a notch (z
+ m). Then, a bar @ (9 b) in which the through hole 0 of the acoustic resistance block (9) is
formed is fitted and united with the notch (14 a). Incidentally, in this molded body +141, (i5a),
(i5b) and (15c) are respectively derived from the gate, source and drain of the field effect
transistor which is the active element for pre-amplification, and 9 terminals (6) Double "'-(, (H,
these terminals (15m), (x 5b) and (15c)) Fi gold metal or 9. Mold body (One station outside [iK is
projected, and the terminal (15a) projects from the upper surface. tnsb) and (lse) protrude from
the lower surface. @ Is a light elastic conductive contact electrically connecting a terminal (15a)
of the terminal of the input element of the active element, particularly the terminal derived from
the molded body α4 of the active element for double amplification, to the input plate of the
active element. It is a piece. As shown in FIG. 6, this conductive contact piece +24 has an Hshaped groove (zab) as shown in the figure formed in a metal plate on a disk made of one steel
plate etc. at its center, and two contact tongues (24a) The above-mentioned terminal (lSa) is
projected into the hole (6a) provided at the center of the lower end in the back plate 16) as
shown in FIG. And the conductive contact piece Q4 is brought into contact with the shoulder
surface of the back plate · '6) and through the ring-shaped cushion sheet (rubber sheet) The
upper surface of the mold body α 尋 of the pre-amplification active element is then brought into
contact. Then, with the back plate (6) and the molded body α, the conductive contact piece (7), N
@ and the on-ring cushion sheet (() are pressed and pressed. L 1 は is a shield plate (metal disc)
and is laminated downward in the figure of the mold body 114.
This is provided because the lower end of the shield case 111 is open. It is a contact 1 child
formed by cutting and raising a part of this shield plate ri + 1. Then, the opening-(lc) of the case
'(l) is bent by 1 lII vc to clamp the shield plate 19 from the lower surface thereof. Furthermore.
An open end (lc) vIaICs shield plate (a disk-like printed board t1m is attached to face the opening
end (lc) 171 of the case X111, and a conductive layer having a predetermined pattern is formed
on the lower surface in the figure). And the above-mentioned forceps (15b), (15c) and (II) have
their printed circuit boards (through holes of 181 (u 8m)). (18g) and txsc) are each made to go
outside. At the lower end of the block H, the portion from which the electrons (15b) and (15c)
are led out is a raised portion, and the through hole (x 7 m) formed in the seal 1- ° plate surface
It is fitted to. Also, by closing the open end (13 elephants) of the through hole 03, the
microphone can be made a nondirectional microphone 18). The wedge is a closing head
(provided in this microphone, for example, provided in a dip recorder) for closing the open end
(13a) of the through hole 01, and in this example, is a slide pin having a rubber disc (7). It is a
slide pin which has this slide. The slide bin as is slidably attached to a bushing made of plastic C
insulator such as 1 polysulfone (not shown). In this slide bin q value, a joint portion (191) is
provided at one end thereof, and a rubber circle fE even is attached to the disc-like base portion
(x9 鳳) soil. In this microphone, it is determined by the mass of the acoustic frequency butterfly
diaphragm 13) and the acoustic capacity of the through hole 8) constituting the acoustic cavity.
Also, when the open end (0 at) of the through hole (directed hole) q: 1 is closed by the closing
head 1j, the acoustic capacity is reduced, and the microphone becomes directional and the
sensitivity of the low region is increased. It is suppressed. When this microphone is used as a
single directional micro-bunon Q, if the open end (13g1)-. 191) of the through hole 0 is opened
and the false '' is opened, the through hole (directed hole) (13 Communicates with the outside of
the case + 11 at the back to become a unidirectional microphone. Further, when used as a
nondirectional microphone, the rubber disc I of the slide bin α9 is pressed against the opening
end tl: sa of the through hole ttS so as to close it.
Omnidirectional micro fontal. According to the microphone described above, Dike plum, a nine
pack plate disposed opposite to the diaphragm, a molded body of a pre-amplification active
element disposed on the surface opposite to the diaphragm of the back plate, and acoustics Since
the resistance block and the housing are housed in the case, the overall structure is simple,
compact and easy to assemble, easy to automate, easy to assemble, and obtain a highly reliable
microphone of the electrical contact portion Can. The resilient conductive contact piece is
interposed between the father, the back plate and the mold body, and the terminal connected to
the electrode of the pre-amplifying active element is electrically contacted to the resilient
conductive contact piece From the above, the pack +11-1 is connected to the electrode of the
wedge plate and the electrode for the pre-amplification active element so that the electrical
connection between the tip terminal is easy in its preparation and the electrical connection is
reliable. It becomes. Also, since the acoustic resistance block is formed with a passage (a through
hole as a directional hole) communicating with the outside at the back Wvc of the case, the
design of the directional characteristic is easy and there is no deviation of the directional pattern.
It is possible to obtain easy directional microphones that are both directional and
omnidirectional. Incidentally, although it is conceivable to form a part of the A path (a through
hole which is a directional hole) on a part of the mold of the preamplification active element, it is
difficult to design the directional characteristic. Also, although it is conceivable to provide the
open end of one passage in the aspect of the case, the pattern of the directional characteristics
deviates by 45 °. Since the open end of the passage is on the back of the microphone, providing
a head for closing the open end of the passage on a tape recorder or the like attached thereto
makes it easier to switch between pointing and non-direction. Father, the passage is formed in
the sound resistance block itself, so the passage is quite thin, and even though it requires 14
machining accuracy (111 鮎 “,“ -L It is possible to easily make 4 of desired directional
characteristics and acoustic characteristics. In the above example, a metal disk having a pair of
tongues (24 m) as shown in FIG. IE6 is used as the conductive contact piece @, but it has a
bending elasticity as shown in FIG. It may be a strip-shaped metal plate, or may be a plate-like
elastic metal plate as shown in FIG. For example, when using a conductive contact piece c24
having a shape as shown in FIG. 7, as shown in FIG. 9, the terminal (15 m) drawn from the
electrode of the active element may be short and the arms (XSa) The conductor 1 * contact piece
C4 may be disposed between the end face of the back plate (6) not having a hole and held and
The case of using one plate-like 4 t WI touch piece as shown in FIG. 8 is also similar to 4 L 9 in
FIG. This elastic conductive contact piece! As 24), a conductive rubber disc as shown in FIG. 10 is
used, and the terminal (x5a) drawn from the electrode of the preamplification active element is
slightly thickened, and its nil and pack plate (6) The conductive rubber disc (24 may be
interposed between it and the end face of the disc). Also, the notch (hole) (14 m) formed in the
mold body of the above-described active element for preamplification may be a recessed portion
as shown in the IIE II diagram, as shown in FIG. Of course, it is possible to form a through hole
which is in communication with the t surface and the lower surface of the molded body α and
not in communication with the surface. Then, according to the shape of the notch (1411) of the
molded body I, the shape of the rod-like portion (9b) of the acoustic resistance block (9) is
selected so as to be fitted thereto. Further, the external shape of the micro 1- is not limited to the
above-mentioned cylindrical shape, but may of course be a prismatic shape.
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