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JPS555644

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS555644
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view showing an example of
an electret microphone according to the present invention, FIG. 2 is a cross sectional view
showing a back electrode holding portion, and FIG. 3 is a cross sectional view showing a
transducer holding portion. Fig. 4 is a perspective view of a transducer holder. 11: Case, 12:
Capsule, 16: Vibrating membrane. 1T ииииииииииииииииииииииииииииииииииииииииииииииииииии Part, 38: Column, 39: Insertion
piece, 41: Wiring board, 43: Conversion circuit, 45: Guide groove, 46: Grounding lead.
DETAILED DESCRIPTION OF THE INVENTION The present invention is a microphone using an
electret as a vibrating membrane, in particular a unidirectional electret microphone Kll. In the
conventional microphone of this type, after assembling into a microphone, its directional
characteristic is built up, and if the characteristic is bad, the microphone is disassembled and
rebuilt. Alternatively, the clamping force of the damper cloth is screwed to obtain a storm-like
pointing characteristic. However, it is unclear whether such decomposition and re-competition
will result in good characteristics, while the dampers, =, 1> ?1 (1) screw tightening can be made
to adjust the force In addition to being expensive due to the screw structure, there is a drawback
that ms is troublesome. In this device, the front electrode is held by the back electrode holding
portion substantially opposite to the surface opposite to the vibrating membrane, and + # =-"'JIF'
adjustment of the directivity N'hl in the back electrode holding portion The book is to provide an
electret microphone in which a plurality of through holes are formed, and in the case where the
directivity characteristic is poor, a simple directivity characteristic is obtained by closing the
through hole appropriately IjkvC. (IK An embodiment of the electret microphone according to the
invention will be described with reference to the drawings. In FIG. 1, reference numeral 11
denotes a case, which is, for example, a metal cylinder, and the capsule 12 is accommodated at
one end 11 in the case 11. The capsule 12 is made of a cylindrical metal with a short coaxial axis
with respect to the case 11 and the outer surface thereof is in proximity to the inner periphery of
the case 11. An end plate 14 having a central hole 13 for capturing sound in the-surface of the
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capsule 12 is integrally KN drawn. One surface of the ring 15 is in contact with the circular
surface of the end plate 14 (2), and the ring 15 is accommodated in the cuff cell 12. An electret
vibrating membrane 16 is attached to the other surface of the ring 15. Opposite the peristaltic
membrane 16, 18 is disposed on the spine 1 via a ring spacer 17. A back electrode holding
portion 19 is provided on the opposite side of the back electrode 18 to the vibrating membrane
16, and the back electrode 17 is held by the back electrode holding portion 19. A back hole 18 is
formed in the back electrode 18. The ring-like protrusion 22 is integrally formed on the g edge K
of the surface 1i18 of the back pole holding portion 19 and the back 1g is disposed in the
protrusion 22 and positioned. The height of the ridges 22 is less than that of the back electrode
18 by 4 smaller. A shallow circular recess 23 is formed in the back pole holding portion 19 at a
distance i from the inside of the ring-shaped ridge 22 at i. Inside the circular recess 1123
(damper cross 24 is disposed.
The end of the capsule 12 is bent inward II, so that the back electrode 18 of the back electrode
holding N 19 on the opposite side to the back electrode 18 of the back electrode 2 SWC is
pressed against the single plate 14. By this pressing-in, the vC vibrating film 16 in the capsule
12, the spacer 17, the back electrode 18,-(3), and the holding s19 are fixed. In the embodiment
of the present invention, the lamp back pole holding rod 19 is formed over the entire surface y
with the back & 18 and the back pole holding portion 19 is opposed to the back pole 18 and the
through hole 26 for directivity adjustment in the recess 23 A plurality of are formed. Further, an
anti-sink hole 30 at the time of molding is formed on the side opposite to the lifting film 16. For
example, the five through holes 26 and the three anti-sink holes 30 are formed at y-angular
intervals with the capsule 120 as the center. At the center of back pole holding portion 19, a
back @ terminal lead out hole is formed. A cylindrical metal terminal 28 whose one end is
clogged is inserted into the lead-out hole 27, and the insertion rod is brought into contact with
the back electrode 18 through a hole formed in the damper cross 24, for example spot welding.
The other layer of the terminal rod is bent outward to form an ear portion 29, and the ear
portion 29 is positioned in the enlarged portion 31 of the lead-out hole 27 formed in the back
electrode holding @ 19. A piercing member 32 such as a resin material may be dug in the
enlarged portion 31 to hermetically seal the back electrode holding portion 19 and the terminal
28. An ear 29 and a guard 34 of the terminal 28 are formed in a-(4) ?? -body, and are
projected at a right angle with respect to the back electrode holding portion 19. The ring-shaped
groove 35 is formed at the end face of the back electrode holding portion 19 at the bending
wedge 250, and is made as a molded product of back electrode holding portion 19t?1 synthetic
resin material such as 0 or more. In X11, the transducer holder 36 is housed with the connection
piece 34 of the force 1 cell 12 projecting out. The i converter holder 36 is also shown in FIGS. 3
and 4 A plurality of pillars 38 are integrally formed on a partial surface of the ring-shaped main
body 37 at an equidistant interval with respect to the center of the ring. An insertion piece 39 is
integrally formed on the idle surface of the column 38 and inserted into the ring-shaped ridge 35
of the insertion piece 39Fi back electrode holding portion 19. The wiring board 41 is disposed on
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the surface of the main body 37 opposite to the column 38. The inner diameter of the ring of the
main body 37 opposite to the column 38 is partially enlarged, and the leakage receiver is a
portion 42. In the 0 distribution board 41 & C on which the circular wiring base 41 is positioned
and determined in the portion 42, the impedance conversion circuit 43 is mounted and formed in
the capsule 121m. The input lead X (5) 1144 Fiii hard piece 34KIii 'P of the impedance
conversion circuit 43 is used.
Guides i $ 145 are formed one by one on the surface of each column 38 facing the inner
circumferential surface of the case 11 along the projecting direction of the column 38. The guide
groove 45 is bent and extended until it reaches the inner peripheral surface of the main body 37
through the surface of the substrate 41111. The first exchange holder 36 can be made as a
molded product of a synthetic resin material. The ground lead 46 of the replacement circuit 43 is
inserted between the guide grooves 45 and inserted between the outer peripheral surface of the
h1 capsule 12 and the inner peripheral surface of the case 11, and is connected pneumatically
with the kneader or the like. On the surface of the layout plate 41 opposite to the conversion
circuit 43, a solder layer 47 is formed. The thickness of the substrate 41 is larger than the depth
of the evil 42. An end plate 49 having a central opening 48 is integrally formed with the end face
of the substrate 41'1i 111 of the case 11. Case 1] The other provinces are folded at @VC and the
cuff cell 12 is restrained to one plate 49 @. Therefore, the capsule 12, the converter holder 36
and the wiring board 41 are fixedly built in the case 11. The central hole 13 of the capsule 12 is
covered with the front cross 51. Small sound holes 52 are distributed along the circumferential
direction at the position of the column 38 of the RII unit holder in the circumference 1 and (6)
wall of the case 11-The vibration film of the force cell 12 is opposite in the case 11 An air
chamber 53 is formed by the presence of the column 36 for @. The air chamber 53
communicates with the back surface of the lift 1ii 16 through the through hole 26 and the vent
hole 21, and the through hole 26 forms an appropriate impedance to the velocity component of
the air flow. A large number of through holes 26 are formed, and in this state, desired, i.e.,
correct, uni-directional characteristics are obtained. However, in the case where the directivity
characteristics are not satisfied, it is possible to obtain satisfactory% directivity, by biaxially
sealing a part of the through hole 26 with a resin such as an adhesive. Thus, it is possible to
improve the yield without requiring an expensive screw ** and without causing a defect.
Furthermore, by passing the ground lead 46 through the guide # 145, the lead 46 can be
crimped between the capsule 12 and the case 11 without sagging, and there is a possibility that
the lead 46 will come into contact with the input lead 44 etc. g (7) It can be eliminated. Even if
the case 11 is loosely tightened, the #I 46 and the II-motion 46 can be combined to prevent the
circuit board 41 from running once in the case 11. When the insert piece 39 is formed in the
column 38 and inserted into the ring-shaped groove 35, the column 38 can be relatively thin to
be a book which is relatively rigid as a whole.
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When one end is blocked and the mourning terminal 28 is used, it is possible to increase the low
range with two reconnaissance. That is, the back electrode 8 itself (if an integral terminal is to be
formed, it is necessary to carry out the cutting process and it becomes expensive). Also lead to
back pole 18-? In the case of spot welding, the length direction of the lead is brought into contact
with the W pole 18 and the lumped portion is fI! Bond bonds, it is necessary to bend the lead
sand to stand against the back, and to establish a compartment in the ridge of the lead 11, which
reduces the level of low frequency region. However, the terminal 34 shown in FIG. 1 is obtained
as a molded product in two dimensions, and it is not necessary to form a small chamber which
can be lowered to a lower level. As the center hole of the damper cross 24 is larger, the removal
force ?? ? (8) is not attached, and moreover, the gold W! Also from the point of view of this
point, it is possible to enlarge the center hole of the damper cross 24 by using the terminal 34
shown in FIG. Furthermore, when connecting with the input lead 44 of the conversion circuit (the
thickness of the connection piece 34 is thin, spot welding, work such as soldering or hJIIA0
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