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DESCRIPTION JPS5776994

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DESCRIPTION JPS5776994
Description 1, title of the invention
Electro-acoustic transducer
3. Detailed Description of the Invention The present invention is applied to the auricle insertion
method and the like used by being attached to a concavity of the auricle, such as the concha
cavity etc. Related to In this case, one person uses a novel auricle insertion method
electroacoustic conversion which eliminates the drawback of the conventional widely used
earphone in which the insertion portion which is made to project from the main body of the
earphone is inserted by pressing into the ear hole. Have proposed 7 bowls. This electro-acoustic
transducer is fitted and fitted in the concha cavity, which is the concavity of the pinna, in order to
be able to prevent discomfort and deterioration of the acoustic characteristics at the time of
fitting caused by press-fitting into the ear canal. It is configured to be possible. That is, as shown
in FIG. 1, the electroacoustic transducer includes an outer casing 1 incorporating an
electroacoustic transducer consisting of a diaphragm, a magnetic circuit portion, etc., and a cord
2 for external connection from the electroacoustic transducer. And a cord holding portion 3
extended from the outer casing 1 to be held. The outer casing 1 is formed in a size that can fit
into the concha cavity, which is the concave part of the pinna, and the outer peripheral surface
on the back side where the cord holder 3 is extended is the inclined surface 4 The shape layer j is
configured such that at least two points of the inclined surface portion 4 are supported by a taste
with a tragus, which is a part of the pinna, when fitted with the concha cavity . In addition, the
outer shell 1 is a concha that is a supporting point for supporting the outer shell 1 when the
outer shell 1 is fitted (f when fitted) with the tips of the tragus and the antiparallel VC is provided
so as to be in contact with a point on the outer surface of the earlobe, which is at least one point
on the outer surface. The electroacoustic transducer configured as described above has two
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points of the inclined surface portion 4 of the outer casing 1 supported by the tip A of the tragus
a and the tip EndPage: 1B of the anti-collision as shown in FIG. It is fitted and mounted in the
concha cavity f so as to follow a part of the auricle e at three points of one point of the cord
holding portion 3 which abuts at least one point C of the outer surface of the earlobe C. In such a
configuration (in the electroacoustic transducer, it is necessary to provide a through hole for the
reproduction sound to be emitted in the portion of the front wall 5 opposed to the diaphragm of
the shell 1 (. Also, in the case of a so-called open air type that radiates the back vibration radiated
from the back of the diaphragm to the outside of the external mark 1, 1-outer case 1 back wall 6;
However, in the case of the electroacoustic transducer as shown in FIG. 1 of the pinna insertion
system, it is desirable that the through hole provided in the outer casing is as small as possible,
and more than a predetermined amount. Can not be formed large.
(In other words, to protect the electroacoustic transducer such as the diaphragm, it prevents the
earwax attached when attaching the auricle, iron powder or dust attached when transporting the
device, etc., from entering the outer shell Because it is necessary. However, the provision of the
minute through holes in the outer casing must be avoided from the nature of the electroacoustic
transducer, which causes the deterioration of the processing noise # characteristics. Therefore, it
can be considered that the outer cover 1 is configured using a plate-like member 107 having a
structure as shown in FIG. In the case shown in FIG. 3V, a through hole 8 to which the sound
wave is radiated is formed by a thin plate material 7 such as metal by means of a screw or the
like. It is difficult to form through holes 8 (-i, earlobes and other dusts and the like so as to
prevent intrusion of dust and the like formed by this pressing process etc.) Stick sheet material 9
such as cloth. And, the outer casing 1 formed by the plate-like member 107 formed in this
manner is one that does not cause deterioration of the primary acoustic wave mainly by
preventing the infiltration of the earlobe and other dusts. t can be configured. However, in the
plate-like member 107 as shown in FIG. 3, the mesh-like sheet material 9 has to be attached after
the through hole 8 is formed, the manufacturing process becomes complicated, and the
processing is also difficult. Therefore, the present invention has a simple configuration and can
be easily manufactured and processed, and reliably prevents the infiltration of earwax, iron
powder, dust, etc. from the outside of the outer casing without causing deterioration of acoustic
characteristics, and a diaphragm etc. It is an object of the present invention to provide a device
capable of protecting the electro-acoustic transducer of the present invention, a processing
method C such as electroforming or etching, and a plate-like member having a large number of
minute holes formed thereon. It is intended to completely cover part. Hereinafter, when the
present invention is applied to the electroacoustic transducer shown in FIGS. 1 and 2, the
following description will be made with reference to a specific example. 1 and 2 inside the outer
shell 1 of the electro-acoustic transducer (... As shown in FIG. 4, a yoke 11 having a U-shaped
cross section and a magnet 12 disposed at a central portion of the yoke 11 And a top plate 13
disposed at the top of the magnet 12 and wound around a diaphragm 15 and a voice coil bosen
16 attached to the center of the diaphragm 15 in a suspended manner. An electroacoustic
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transducer 10 is accommodated, which is composed of a vibration system 19 composed of a
voice coil 18 inserted between the magnetic gaps 17 of the magnetic circuit section 14 and Vshaped. Above vibration system! f4 (ri, the peripheral edge of the diaphragm 15 is fixed by the
diaphragm ring 22 to the locking step 21 formed by raising one end of the flange portion 20
projecting the outer periphery of the upper edge side of the yoke 11 in a ring shape It is attached
to the magnetic circuit unit 14.
In the central portion of the magnetic circuit portion 14, there is provided a through hole 23 in
which a damping member 22a is fitted to radiate the back vibration of the diaphragm 15 to the
outside, and the yoke 11't't = projective A through hole 25 stuck on one end opening side of the
damping material 24 is also provided near the base end of the provided ridge portion 20 so as to
radiate to the entire rear surface vibration of the diaphragm 15. As a matter of course, on the
back surface / 1 Ill Vc of the magnetic circuit unit 14, a terminal plate 28 for connecting the lead
wire 26 connected to the voice coil 18 and the external connection cord 27 is fixed by a molded
unit 29 of synthetic resin. The cord holding portion 3 is integrally formed from the mold portion
29 (G is extended downward in the figure so as to be connected by 1?). The electroacoustic
transducer 10 having the configuration as described above (covers the front side of the
diaphragm 15 and covers the back side of the front protection member 31 and the magnetic
circuit portion 14 formed as shown in FIG. It is housed and held in an outer casing 1 comprising
a back surface protection member 32 formed as shown in FIG. That is, in the outer case 1, the
front protection member 31 formed in a circular cap shape is fitted to the rising wall 20 a
provided on the flange portion 20 of the yoke 11, and similarly formed in a substantially circular
cap shape. By fitting the back surface protection member 32 provided with the insertion hole 33
to be inserted into the flange portion 20 of the yoke 11, the electroacoustic transducer 10 is
housed and held therein. In addition, the front and back surface protection members 31 and
3211-1: the projecting pieces 20b1c provided on the outer periphery of the collar portion 20 are
abutted and the fitting position with respect to the yoke 11 is regulated. By the way, the front
surface protection member 31 and the rear surface protection member 32 which constitute the
outer casing 1 are formed of thin plate-like members in which a large number of minute holes 35
are formed. Then, the front surface protection member 31 and the back surface protection
member 32 are formed by electroforming to duplicate the same mold for the prototype and
circulation using electrodeposition by electrolysis CC. That is, a negative mold corresponding to
the front and back protection members 31 and 32 having the large number of micro holes 35 is
formed in advance, and copper, nickel, iron or the like is used as the negative type. The metal is
electrodeposited, and the electrodeposited metal layer is removed from the negative mold.
Alternatively, a prototype of the same type as the front and back surface protection members 31
and 32 is formed, and this prototype is cast and cast to form a negative mold, and further a
negative mold Each desired protective member 31.32 may be formed.
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The micropores 35 provided in the front and back surface protection members 31 and 32 cover
the electroacoustic transducer 10 so as not to inhibit the emission of sound waves, and the front
surface protection member 31 is opposed to the diaphragm 15b. It is desirable to provide the
back surface protection member 32 at the portion facing the through hole 23. 25 provided in the
magnetic circuit portion 14 in the portion 1. The front and back surface protection members 31
and 32 formed by the above-described electroforming process are formed as extremely thin plate
members, so that the acoustic impedance O extremely reduces the load on the reproduced sound
radiated from the diaphragm 15. It can be low. Further, the minute holes 35 formed in each of
the members 31 and 32 can be formed, for example, as a hexagonal through hole of 0.2 ?
degree on one side as shown in FIG. The front and back face protection members 31 and 32
constituting the invention have a low acoustic impedance, and the minute holes 35 formed
therein are thick enough to prevent the infiltration of earlobes, dust, etc. Any method may be
used as long as it is formed by a processing method for forming as long as, for example, it may
be formed by etching processing or the like. That is, a plate-like member of thin metal
constituting the front and back surface protection members 31 and 32 is prepared, and this
plate-like member (also formed by a method of forming the minute holes 35 by etching) Good. As
described above, the electroacoustic transducer according to the present invention is a sound in
which a large number of micro holes are formed by processing the front and back surface
protection members 31 and 32 constituting the outer casing 1 by a processing method such as
electroforming or etching. Since the plate member chamber having a low dynamic impedance is
formed, at least a part of the outer peripheral surface is a micropore surface that can prevent the
infiltration of earwax, iron powder, and other dust without inhibiting the radiation of the sound
wave from the diaphragm. Will be covered with Therefore, the present invention can be
configured to prevent deterioration of the sound 4 characteristics and to effectively protect the
electroacoustic transducer such as the diaphragm from earwax, iron powder, dust and the like
entering from the outside. In addition, by covering the outer peripheral surface with a plate-like
member in which a large number of micro holes are formed, it is possible to form a mesh-like
appearance and a 1-fold progressive design of the metal.
(иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииии It can be configured to be freely designed because it can be configured to
exhibit a desired flexible appearance. In the above-described embodiment, since the open air type
is mentioned and described, the front and back surface protection members constituting the
outer casing are constituted by plate members having a large number of minute holes, but other
types of In this case, the front end side portion of the diaphragm may be covered with the abovementioned plate-like member instead of a little EndPage: 3.
The present invention is particularly effective when applied to the pinnacle-inserting type
electroacoustic transducer, but the same effect can be obtained by applying the pinnacleinserting type microphone and its small-sized electroacoustic transducer V. can get.
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4. Brief Description of the Drawings FIG. 1 is a back view of an electroacoustic transducer for
explaining the present invention, and FIG. 3 is a cross sectional view showing a plate-like member
constituting an outer shell of the electroacoustic transducer. is there. FIG. 4 is a cross-sectional
view showing an embodiment of the present invention, FIG. 5 is a perspective view showing a
front surface protection member constituting an outer casing, and FIG. 6 is a perspective view I
of a rear surface protection member. 7 is an enlarged view of micro holes formed in the front and
back protective members. 1 и и и Outer casing 10 и и и и electro-acoustic conversion element 31 и и и и
front protection member 32 и и и и back protection member Patent applicant Sony Corporation
Attorney Attorney Koike Minoru; 7 \ 1 EndPage: ?
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