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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of a conventional no-il system
speaker, FIG. 2 is a perspective view for explaining a vibrating membrane portion, and FIGS. 3
and 4 are vibration of the vibrating membrane. 5 is an explanatory cross-sectional view showing
the vibration state of the diaphragm of the speaker in FIG. 1, and FIG. 6 is a waveform diagram
schematically showing the operation of the diaphragm portion. . 7 and 8 show a first
embodiment of the present invention, wherein FIG. 7 is a perspective view of a vibrating
membrane portion, FIG. 8 is a cross sectional view thereof, and FIG. 9 is a sectional view of the
present invention. FIG. 10 is a cross sectional view of a vibrating membrane portion showing a
third embodiment of the present invention. 1 to 4 magnets 7 vibration films 8 to 11 pole pieces
23 conductors 42 and 43 tension rods 44. Fig. 2 Fig. 1 7 1 50 50-154730 (2) Fig. 3 Fig. 4 Fig. 5
Fig. 6 i Fig. 8-72-Japanese Utility Model Publication No. 50-154730 (3) Fig. 9 Fig. 10 k-73
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroacoustic
transducer. Conventionally, in order to convert an electrical signal into acoustic vibration, il
mainly uses a horn speaker and a cone-shaped crab for crabs, which do not satisfy all of the
conditions as a transducer. Therefore, recently, Oscar Baile has developed a so-called bail type
electroacoustic transducer in which the defect of the conventional transducer has been corrected.
FIG. 1 is a top view showing the above-described Bail speaker. The speaker of the present
invention applies a strong and strong magnetic field in the direction indicated by the arrow + 51
+ 61 generated from four ferrite magnets i1112) (31fa to the imaging film (7) disposed at the
center and to the diaphragm (7) A voice turtle is converted into acoustic vibration by supplying a
current to a ribbon-like conductor (not shown in FIG. 1) that is attached. In this FIG. 1, + 81 (91
α (IQυ is a pole piece for forming an exit path, housing 2 + (13 + is a magnet supporting
member, 141 (IS is a nonmagnetic spacer, a 9-is 12)) diaphragm (7 C21 + is a cover. FIG. 2 shows
the vibrating membrane (7) in more detail, and this vibrating membrane +71 has a plurality of
heat sinks @ so that the ribbon-like conductor extends in the vertical direction in each of the
folds. It is worn. The electrical connection of the conductor 2 is such that every other current
flows in the opposite direction, as is apparent from FIG. That is, the direction of current changes
alternately from top to bottom and from bottom to top. Therefore, now, when the voice signal
current in the first direction is supplied to the conductor (c), the diaphragm is placed in a strong
magnetic field, and according to the law of framing, as shown in FIG. ■ Move in the direction of
arrow C 241 respectively, c atmosphere! 51 Ur + (C) 6 開 き opens, air layer α2 (to) closes, so it
is drawn in the direction of arrow (to) and exhausted in the direction of arrow (to). On the other
hand, when the voice (3) signal -f & of the direction of @ 2 opposite to the first direction is
supplied to the conductor, the fold @ moves in the direction of the arrow diagram, and the air
layer 5 @@ 6 @ closes. Air layer □□□ @ gloss is opened, so that air is exhausted in the direction
of the arrow, and it is drawn in the direction of the arrow. This generates air vibrations or sound
waves. Because of the structure in which the wide conductor and the vibrating membrane are
integrally placed in the magnetic field, the bail type slider as described above vibrates uniformly
over a relatively wide 8-wave number band, and its frequency characteristics are It has the
features that it is flat and it is difficult to generate divided vibration, it has excellent
characteristics of transient characteristics because the vibration film of the @ child is driven on
the entire surface, good rise of sound, and good efficiency.
However, this kind of #eilt is also satisfactory, particularly <with the following disadvantages. (A)
A waveform distortion occurs with an even-order bird frequency (4). (B) It is difficult to maintain
the shape of the vibrating film, and an abnormal sound such as sticking is generated. (C) There is
a problem with the low-pass nobles. Next, these defects will be described in more detail. First, the
defects described in the item (A) above are clearly shown in FIG. 3 as a result of investigation
based on 71 experiments. As is apparent from FIG. 5, the vibrating membrane 171 of the
waveform is displaced from the state shown by the solid line to the state shown by the dotted
line, and the JJN (37a) shown in practice is further protruded to 131 parts (37b) shown by
inspection. It was found that the filling (38a) shown by a solid line is based on being recessed to
become 1m & (38b) shown by a dotted line. The displacement as described above works contrary
to the action to increase pressure in differential @ ci, etc., and to the action to reduce pressure in
air layer @ shif j 伽, desk etc. On the other hand, it acts to increase the pressure, and as is
apparent from the schematic waveform diagram of (C) 鮪 6, the second harmonic shown by
c9t40 卿 is generated. Actually, the gap ratio is 5-6111111 in order to enhance the efficiency of
the magnetic field, so the area ratio of the bending deformation portion to the fixed-effect
radiation storage near the conductor is 20-304, and when the large amplitude is around 3-4 KHz
The 2nd ^-wave of ' I! Is a value exceeding 10% of the fundamental wave, and it is not
desirable for sound quality. Next, the drawback of the above-mentioned (1) in (B) is caused by the
fact that it is difficult to hold the folded diaphragm (7) in a normal state. Abnormalities were
more likely to occur in the following bands with increasing lKH. Father The disadvantage of the
above (CI) term is the shape of the vibrating membrane. It is based on the fact that (displacement
amount) can not be made large. Therefore, the present invention seeks to provide an electric
noble metal converter in which the above drawbacks are eliminated. (6) Next, the present
invention will be described in detail. The electric number conversion device 11 based on the
present invention has a plurality of support members disposed in a staggered manner at intervals
of the foot on the first line and the second line, respectively, Between the supporting member and
the supporting member on the second line, a vibrating membrane made of polyethylene,
polyester or the like, or a vibrating membrane of a conductor electrically connected to an
adjacent vibrating membrane is provided. Then, an elastic portion is formed by a fold in the
peristaltic membrane between the support member on the first line and the support member on
the second line, or an elastic member is attached to the boundary portion between the support
member and the diaphragm. The telescopic portion is formed or otherwise formed.
In addition, it is disposed on the vibrating membrane so as to be positioned between the support
member on the first one and the support member on the second line and extend in the same
direction as the support member (7). And every other one of the plurality of ribbon-like
conductors connected in such a manner that current flows in the opposite direction, for example,
a pull-umi ribbon or a conductor made to flow a current to the vibrating membrane itself. A
father, a magnetic field application attachment disposed so as to apply a magnetic field to the
conductor, for example, a ferrite permanent magnet disposed so that the magnetic flux is
orthogonal to the first and second lines. The electro-acoustic transducer configured in this
manner has less harmonic distortion, a slight generation of abnormal noise, and 51 J of
broadband conversion. Hereinafter, an example of the present invention will be described based
on the drawings. First, the first embodiment will be described based on FIG. 7 and FIG. The basic
configuration of the speaker according to this embodiment is the same as that of the book shown
in FIGS. 1 to 4 (8), so the illustration thereof is omitted and only the perspective view of the
diaphragm portion and its cross sectional view It is shown in FIGS. 7 and 8. First, lJ! The tension
stems (421 t 43) are placed in a staggered manner in a frame (not shown) so as to be positioned
on the first line indicated by the aa line in FIG. 8 and the second line indicated by the b @ b @.
After that, it is made of synthetic resin made of synthetic resin of about 0,021,111, for example,
polyethylene, ethylene / vinyl acetate unity, a vibrating membrane (7) selected from polyester,
and ribbon-like conductor such as aluminum As shown in FIGS. 7 and 8, the books closely
attached and provided with a fold are alternately stretched. At this time, the ribbon-shaped
conductor is positioned approximately halfway between the a-a line and the b-b line and is
extended in the same direction as the stretching rod f43Ll. The left and right ends of the
shooting film (7) are also fixed to the left and right columns of the frame so that the voice
current is applied to the conductor c2. Connect the supply pad II (not shown) for supply. Father,
in order to prevent the occurrence of abnormal sound and displacement due to incomplete
contact of the moving film (7) with the tension rod t43I, a brake paint having appropriate
viscoelasticity is applied to the contact portion. After the vibration am portion is formed in this
manner, it is detachably fixed to the center of the magnet (11 to (4) as shown in FIG. At this time,
the lamination direction of the thin plate of the hole piece (8) to αυ and the stretching rod i42.
The tension rod 142U is vertical so that it matches the direction in which +43 extends, and a-a!
And b-b guns so that the magnetic flux crosses at right angles.
One example of the geometrical size of the vibrating membrane portion is shown in the vertical
direction of the vibrating membrane (7: ie the stretching rod 142114; the length of the extended
city of l is approximately 13011. The horizontal direction is about 3 (1), and the number of folds
@ is 0α17. According to the configuration of the above-described embodiment, since the bent
portion of the diaphragm bent in the accordion shape is supported by the tension rod i 42143 of
the support member, the vibration of the diaphragm (7) When the air of air is sucked and
discharged, the movement of the bending portion of the vibrating membrane, which operates in a
direction to halve the effect with respect to the suction and discharging of the air, can be
suppressed, and the vibration of the vibrating membrane is effectively used It is possible to
perform high-fidelity acoustic conversion such as the second high i 14 waves φ. Further, by
supporting the bent portion of the vibrating membrane by the support member, it is possible to
prevent the bending in the # 巌 (outside) direction of the bent portion, and in particular, it is
possible that the above-mentioned bending occurs in the low region. Generation of abnormal
noise can be prevented. q υ Also, the vibrating membrane 17) is stretched vail 4. . I) being
alternately supported by 143, it is mechanically stable and can be made very small amount, and
it is possible to obtain an electroacoustic transducer with high fidelity and high efficiency. Partial
or shooting 11! Since the extension (1171) is provided at 1171 and the hinge (2) is provided and
finished, the amplitude (displacement amount) of the vibrating membrane can be increased, and
conversion of a wide band is possible. Next, a second embodiment of the present invention will
be described with reference to FIG. However, the same reference numerals are given to parts
common to the first embodiment, and the description thereof is omitted. In this embodiment, the
vibrating film (7) between the tension rods II and q3 is formed so as to be ground in the same
direction as the folds 1441 or the tension rods 143 + 43. Even if formed in this manner,
substantially the same effect as that of the first embodiment can be obtained. Next, a third
embodiment of the present invention will be added to FIG. However, the same reference
numerals are given to parts common to the first embodiment, and the description thereof is
omitted. In this embodiment, elastic members (1 to 4 are respectively disposed on the both sides
of the stretching rod 43143 instead of providing the folds in the vibration conversion (7), and an
elastic membrane ( 7) is stretched. Accordingly, the portion of the elasticity 1i acts as a
stretchable portion. Even with this configuration, substantially the same effect as that of the first
embodiment can be obtained. Although the present invention has been described above based on
the embodiments, the present invention is not limited to the above-described embodiments and
can be further modified. For example, it is possible to pre-deform the recording of the tension rod
142114 :) and its shaped tube type.
Also, although aluminum is preferable in terms of mass, the conductor may support other
substances such as copper. In addition, the conductive material is a method of adhesion of a
ribbon, selective deposition of a conductive material III (131 evaporation, formation of a
conductive material on the entire surface, etching after leaving a conductive material in a
selective Kpk constant pattern, etc. It can be formed by a method selected from among the above.
Also Taki T! R11 l 171 itself may be used as a conductor, and it may be insulated at the
stretching rod (421 143). The line of the pill 1 and the second ridge are not straight lines like the
a-a line and the b-b ridge, and may be a curve. It is also applicable to electro-acoustic transducers
similar to this other than speakers.
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