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DESCRIPTION JPS5752298

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DESCRIPTION JPS5752298
Description 1, title of the invention
Speaker device
Detailed Description of the Invention The present invention relates to a speaker device, and more
particularly to improvement of sound quality and efficiency in the speaker device. The recent
audits or booms are spectacular, and as booms increase, enthusiasts are hearing and more
sophisticated equipment is required. -Although an audio device is included in the mouth, it
includes a tuner, an amplifier, a speaker device and the like, and whether or not a high quality
sound can be obtained depends on these overall characteristics. However, it is true that the
speaker apparatus, which finally converts a predetermined signal into sound, holds the key. The
applicant previously invented and filed a patent for a very rigid diaphragm made of fiber
reinforced plastic, metal and the like. Those disclosed in Japanese Patent Application Laid-Open
Nos. 58-57022 and 58-119028 are disclosed. -By using a highly rigid diaphragm for this, a very
clear sound can be obtained compared to a diaphragm made of a relatively soft material such as
paper, and in addition, a cone paper of about twice the diameter Comparable loudness is
obtained, and-with the diaphragms, EndPage over the entire range from highs to lows can
produce a loud sound. However, there is still room for improvement in this amazingly powerful
speaker. That is, in the speaker apparatus of the so-called external magnet type using the annular
permanent magnet, the inventor of the present invention has the first yoke and the second yoke
that are adjacent to each other for the permanent magnet and fixed by suction. A bony layer or a
copper layer was laid on the surface along the border with the border, and as a result, I noticed
that the sound quality was further improved. This is because the magnetic flux density formed in
the gap formed between the periphery of a cylindrical ball bent at the center of the first yoke and
the hole of the second yoke into which the pole is inserted It is believed that the leakage flux is
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restricted by the provision of the carbos layer or the copper layer on the surface near the
boundary between the yoke and the permanent magnet, and one of the causes is high height.
Although there is no choice but to wait for further study to determine whether this speculation is
appropriate, it is confirmed by almost all the listeners who actually attended the experiment that
the sound quality is actually improved. There is. The present invention is based on the above
findings and has been made for the purpose of providing a speaker with excellent sound quality
at low cost according to the prior art, and the gist of the present invention is at least the
permanent magnet and the first one. The surface of the yoke and the second yoke adjacent to the
adsorption portion ((a layer of a nonmagnetic conductive material such as a carbon layer is
formed.
Hereinafter, embodiments of the present invention will be described in more detail with
reference to the drawings. In FIG. 1, 1 is a wooden closed box which is a kind of baffle, and a
sound absorbing material 19 is attached to the inner surface thereof. A speaker 8 is fixed to the
open portion 2 formed on the front of the closed box 1 in a state of closing the opening 2, and a
shield 4 is fixedly provided in front of the speaker 3. The speaker 3 comprises a diaphragm 7
comprising a dome-shaped gap (dome portion) 6 and a funnel-shaped cone portion 5 and a
cylindrical bobbin 9 fixed thereto, as shown in FIG. A vibrating body 15 is provided. The cone
portion of the diaphragm 7 has a substantially frusto-conical shape, and is injection-molded by a
thermoplastic open (FRTP) reinforced with glass fibers etc., provided with a large number of
radial ribs 10 on its inner surface (or outer surface). It is a thing. It is desirable that the thickness
t of the cone portion 5 be gradually reduced from the central portion toward the outer peripheral
portion. In particular, in this embodiment, the radius r from the center of the cone portion 5 and
the thickness r · The thighs are designed to gradually decrease toward the outer periphery, and
are formed to have an average thickness of 0.5 mm and a minimum outer wall thickness of 08.
Further, the dome portion 6 of the diaphragm 7 is a dome-shaped disc body convexly formed
toward the front, and the thickness thereof is reduced toward the central portion, and the back
side thereof is most clearly shown in FIG. A number of radial ribs 1.1.12 are formed as shown in
FIG. The ribs 11 are generally high in height and are as high as the center and are mutually
connected at the center. On the other hand, the rib 12 is a low rib and is disposed two by two
between the ribs 11. The dome portion 6 is also injection molded of a fiber reinforced
thermoplastic resin as the cone portion 5 is. The bobbin 9 is a paper-made cylinder impregnated
with resin, and the voice coil 8 is wound around one end thereof. The bobbin 9 is reinforced by a
thin cylindrical body 13 made of aluminum at the end opposite to the voice coil 8 wound, and is
integrated with the diaphragm 7 by an epoxy resin. The diaphragm 7 is a ring of the frame 2 by
the edge 21 and the inner peripheral portion thereof is attached to the outer peripheral edge of
the diaphragm 1 plate 7, while the outer peripheral edge is glued to the front surface of the
flange portion of the frame 22 The diaphragm 7 is connected to the frame 22 in such a manner
that the diaphragm 7 can be moved freely in the axial direction. The shielding plate 4 is fixed in
front of the edge 21. The shielding plate 4 is an annular member formed of a synthetic resin and
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plated on both the front and back sides to increase the rigidity, and the frame 22 is surrounded
by a plurality of nupecers 23 disposed at equal pitches. EndPage: 2 when viewed from the front
side of the speaker apparatus 100, covering almost the entire surface of the edge 21 (however,
the entire surface in this case means the entire surface except for the part attached). The part is
extended from the outer side to the upper part.
The shielding plate 4 is also shaped so as to approach the edge 21 toward the inner peripheral
portion, and a slight gap remains even when the diaphragm 7 vibrates at the maximum
amplitude at the inner peripheral end. It is made to approach to the extent. The back surface of
the shielding plate 4 (the sound absorbing material 24 such as foam rubber is adhered. An
annular pure iron second yoke 27 having a hole 26 for forming a gap 25 at its center is fixed to
the rear end of the frame 22, and an annular ferrite is further attached to the rear end 1 of the
layer 27. The permanent magnet 28 and the disk-like pure iron first yoke 30 having a cylindrical
pole 29 at the center overlap so that the periphery of the tip of the pole 29 forms an appropriate
gap with the hole 26. It is fixed by suction in the closed state. In accordance with the present
invention, a copper or copper positive layer 31 is circumferentially provided in the vicinity of the
boundary between the permanent magnet 28 and the first yoke 27 and the second yoke 30 fixed
to both sides thereof. In the case of copper, the layer is formed to a film thickness of several tens
of microns by vapor deposition, and in the case of a carbon layer, a paint containing carbon
powder as a main component is applied to a film thickness of about 05-. The voice coil 8
described above is inserted in the magnetic field formed in the gap 25. In the speaker device 100
configured as described below, when a signal current flows through the voice coil 8, the vibrator
15 made up of the bobbin 9 and the diaphragm 7 follows this signal and vibrates to generate
sound. This sound is more beautiful and sound quality than the previous speaker device. This is
because the signal current generates an electromagnetic force in accordance with Fleming's lefthand rule to drive the diaphragm 7 together with the bobbin 9 so as to vibrate, and the driving
force is a gap due to the formation of the layer 31. It is presumed that the magnetic flux density
of 25 is increased to increase the efficiency and improve the sound quality. As described above,
the sound quality of the speaker device can be improved by a simple structure without changing
the material of the permanent magnet 28 from the normal) elite material to another expensive
material exhibiting larger ferromagnetism. Incidentally, although the layer 31 of carbon or
copper in the above embodiment is partially laid near the boundary between the permanent
magnet 28 and the yoke 27.30, the layer 81 is made of the permanent magnet 28 and the yoke
21. Even if it is laid over the entire surface of .80, there is an advantage that similar effects can
be obtained. As described above in detail, according to the speaker device of the present
invention, the efficiency and the sound quality of nupika can be improved by adding a simple
process of laying a layer of copper or carbon near the boundary between the permanent magnet
and the yoke. This produces an effect that can provide a speaker device that can be turned to a
higher level.
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4. Brief description of the drawings. FIG. 1 is a side sectional view showing an embodiment of the
present invention, FIG. 2 is an enlarged front sectional view of the main part, and FIG. 3 is an l-1
sectional view in FIG. It is. 7: diaphragm 8: voice coil 25: gap 26: hole 27: second yoke 28:
permanent magnet 29: pole 30: first yoke 31: copper or carbon layer 100: speaker device
applicant Kenzo Inoue attorney patent attorney Kobe Denshi-EndPage: 3 Third N Procedure
Amendment (Spontaneous) Secretary of the Patent Office of the Patent Office on October 21,
1981 1) Sakushuden ■, Display of the Case Patent Application No. 112084 2, Title of the
Invention 2. Name of the invention speaker device 3, relationship with the person making
correction Patent issue address Address 22 Tokai City Aichi Prefecture foster father town
Kitatanda 22 Name I-H Ken E 4 Agent name (7966) Patent attorney Kobe Nori 5 oil Full-face
correction specification I, name of invention I, name of invention speaker device
Speaker device
3. Detailed Description of the Invention The present invention relates to a loudspeaker device,
and more particularly to the improvement of sound quality and efficiency in the loudspeaker
device. EndPage: 4 Recent audio booms are astonishing, and as booms or booms enthusiasts
become overheard, more sophisticated equipment is being demanded. -Even though an audio
device is included in the mouth, it includes a tuner, an amplifier and a speaker device, etc.
Whether or not a high-quality sound can be obtained depends on these overall characteristics.
However, it is true that the speaker apparatus, which finally converts a predetermined signal into
sound, holds the key. The applicant previously invented and filed a patent for a very rigid
diaphragm made of fiber reinforced plastic, metal and the like. Those disclosed in Japanese
Patent Application Laid-Open Nos. 53-57022 and 58-119023 are disclosed. By using such a
high-rigidity diaphragm, a very clear sound can be obtained compared to a diaphragm made of a
relatively soft material such as paper, and it is comparable to a cone paper of about twice the
diameter. The volume is obtained, and-with the diaphragms, it is possible to produce a sound that
is spread over the entire range from high to low tones. However, there is still room for
improvement in this amazingly powerful speaker. In the speaker apparatus of the so-called
external magnet type using an annular permanent magnet, the inventor of the present invention
has a first yoke and a second yoke fixed by suction adjacent to both sides of the permanent
magnet. The conductive layer such as carbon, copper, stainless steel and boron steel plate was
laid on the surface along the boundary with the magnet, and as a result, it was noticed that the
sound quality was further improved. This is because the magnetic flux density formed in the gap
formed between the periphery of the cylindrical pole provided in the center of the first yoke and
the hole of the second yoke into which the ball is inserted is It is believed that the leakage flux is
limited by the provision of a conductive layer on the surface near the boundary between the yoke
and the permanent magnet, and the high magnetic flux is one of the causes. Although there is no
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choice but to wait for further research to determine whether this speculation is appropriate, it is
confirmed by almost all the listeners who actually attended the experiment that the sound quality
is actually improved. ing. The present invention is based on the above findings and has been
made for the purpose of cheaply providing a speaker with superior sound quality at a lower level
than in the prior art, and at least the permanent magnet and the first yoke And the conductive
layer is formed on the surface near the suction portion with the second yoke along the suction
portion.
Hereinafter, the present invention will be described in more detail based on the drawings
showing an embodiment of the present invention. In FIG. 1, 1 is a wooden closed box which is a
kind of baffle, and a sound absorbing material 19 is attached to the inner surface thereof. A
speaker 3 is fixed to an opening 2 formed in the front of the closed box 1 in a state of closing the
opening 2, and a shielding plate 4 is fixedly provided in front of the speaker 3. The speaker 3
comprises a diaphragm 7 comprising a dome-shaped gap (dome portion) 6 and a funnel-shaped
cone portion 5 and a cylindrical bobbin 9 fixed thereto, as shown in FIG. A vibrating body 15 is
provided. The cone portion of the diaphragm 7 has a substantially frusto-conical shape, and is
injection-molded with a thermoplastic resin (F, RTP) reinforced with glass fibers etc., provided
with an inner surface (or an outer surface or a large number of radial ribs 10). It is It is desirable
to gradually reduce the thickness [of the cone portion 5 from the central portion toward the
outer portion, and in the present embodiment, in particular, the radius r from the center of the
cone portion 5 and the thickness t at that position Product r-t gradually decreases toward the
outer peripheral portion, and is formed to have an average thickness of about 0.5 mm1 and a
minimum outer peripheral thickness of 9.8 mm. Further, the dome portion 6 of the diaphragm 7
is a dome-shaped disc body convexly formed toward the front, and the thickness thereof is
reduced toward the central portion, and the back side thereof is most clearly shown in FIG. A
number of radial ribs 11, 12 are formed as shown in FIG. The ribs 11 are generally high in height
and are as tall as the center and are mutually connected at the center. On the other hand, the rib
12 is a low rib and is disposed two by two between the ribs 11. The dome portion 6 is also
injection molded of a fiber reinforced thermoplastic resin as the cone portion 5 is. The bobbin 9
is a paper-made cylinder impregnated with resin and EndPage: 5, and the voice coil 8 is wound
around one end thereof. The bobbin 9 is integrated with the diaphragm 7 by an epoxy resin,
when the end on the opposite side to the voice coil 8 is captured by the thin cylindrical body 13
made of aluminum. . The diaphragm 7 is attached to the frame 22 by an edge 21. That is, the
edge 21 is a fabric ring with a circumferential undulation to increase its deformability, and its
inner periphery is attached to one outer periphery of the diaphragm 7, while its outer periphery
is Is affixed to the front surface of the 7 rung portion of the frame 22, and the diaphragm 7 is
connected to the frame 22 so as to be able to move in a fine direction @ freely.
The shielding plate 4 is fixed in front of the edge 21. Shielding plate 4 is an annular member
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formed of a synthetic resin and plated on both the front and back sides to enhance rigidity, and a
plurality of spacers 23 disposed in equal pitches are interposed between It is fixed to the frame
22 and covers almost the entire surface of the edge 21 (when viewed from the front side of the
speaker device 100) (the entire surface in this case means the entire surface except for the
surface). The portion is protruded outward from the frame 22. The shielding plate 4 is also
shaped so as to approach the flange 21 toward the inner peripheral portion, and at the inner
peripheral end, a gap is slightly left even when the diaphragm 7 vibrates at the maximum
amplitude. It is being approached. A sound absorbing material 24 such as foam rubber is adhered
to the back surface of the shielding plate 4. An annular pure iron second yoke 27 having a hole
26 for forming a gap 25 at its center is fixed to the rear end of the frame 22, and an annular tulle
light permanent is attached to the rear end face of the yoke 27. A magnet 28 and a disc-shaped
pure iron first yoke 30 having a cylindrical ball 29 at the center are overlapped so that the
periphery of the tip of the pole 29 forms an appropriate gap with the hole 26. It is fixed by
suction in the cold state. In accordance with the present invention, the conductor layer 31 of
copper or carbon is circumferentially provided in the vicinity of the boundary between the
permanent magnet 28 and the first yoke 27 and the second yoke 30 fixed to both sides thereof.
In the case of copper, the layer is formed to a film thickness of several tens of microns by vapor
deposition, and in the case of a carbon layer, a paint containing carbon powder as a main
component is applied to a film thickness of about 0.5. The voice coil 8 described above is
inserted in the magnetic field formed in the gap 25. In the speaker device 100 configured as
described above, when a signal current flows through the voice coil 8, the vibrating body 15
formed of the diaphragm 7 in parallel with the bobbin 9 follows this signal and vibrates to
generate a sound. This sound is more beautiful and sound quality than the previous speaker
device. This is to generate an electromagnetic force according to the above-mentioned signal
current or the Fleming's left-hand rule, and drive the diaphragm 7 together with the bobbin 9 to
vibrate, and the driving force is a gap due to the formation of the conductor layer 31. It is
estimated that the magnetic flux density of 25 is increased, the efficiency is improved, and the
sound quality is improved. Thus, the sound quality of the speaker device 100 can be improved by
a simple structure without changing the material of the permanent magnet 28 from an ordinary
ferrite material to another expensive material exhibiting larger ferromagnetism. Another
embodiment of the present invention will now be described.
The same reference numerals are given to the parts having the same pain as the abovementioned embodiment, and the description will be omitted. In FIG. 4, reference numeral 40
denotes a band-shaped silicon steel plate, which is attached to the outer periphery of the
permanent magnet 28 near the boundary between the permanent magnet 28 and the first yoke
30 and the second yoke 27. A conductive layer covering the surface is formed. According to this
embodiment, in addition to the improvement of the sound quality of the sound reproduced from
the speaker device 100, there is an advantage that the timbre is changed as in the abovementioned embodiment. Further, even when the conductor layer 40 is formed of 18-8 stainless
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steel, in addition to the improvement of the sound quality, a different tone can be obtained. As
described above, according to the above embodiment, the sound quality is improved, and by
changing the material of the conductor layer, it is possible to change the device EndPage: 6
configured from the speaker device 100 to a desired tone. . Incidentally, the conductor layer
81.40 of carbon or copper in the above embodiment is partially laid near the boundary between
the permanent magnet 28 and the yokes 2''7, 80, or the conductor layer 31 is It has been
confirmed that the same effect can be obtained even if the entire surface of the permanent
magnet 28 and the yoke 27.30 is sprayed or dipped by the like. In this case, there is an
advantage that one is simplified as compared to forming a partial layer. Of course, the conductive
layers 31 and 40 may be made of other conductive materials in addition to those described in the
previous embodiments. As described above in detail, according to the speaker device according
to the present invention, addition of a simple and inexpensive process of laying the conductor
layer along the adsorption portion near the stepped portion between the permanent magnet and
the yoke As a result, the present invention produces an effect capable of providing a speaker
device that further improves the efficiency and sound quality of the speaker.
4. Brief description of the drawings. FIG. 1 is a side sectional view showing an embodiment of the
present invention, FIG. 2 is an enlarged front sectional view of the main part, and FIG. 3 is a
sectional view of FIG. It is. 4 is a view corresponding to FIG. 2 showing another embodiment of
the present invention 67: diaphragm 8: voice coil 25: gap 26: hole 27: second yoke 28:
permanent magnet 29, pole 30: First yoke 100: speaker device EndPage: 7
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