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JPS54157618

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DESCRIPTION JPS54157618
Description 1, title of the invention
Electromagnetic sound transducer
3. Detailed Description of the Invention The present invention relates to an improved
electroacoustic transducer mainly for a speaker, wherein the diaphragm has no flat portion and
the air pressure generated by the vibration of the diaphragm. The diaphragm can be vibrated in
its original form without the deformation due to inertia and the restoration of the deformation at
the end of the vibration, the faithful reproduction can be achieved, the acoustic characteristics
can be improved, and the periphery of the diaphragm can be When held by an elastic body, it
operates sufficiently to follow even at large amplitudes, and in particular, it is possible to
faithfully reproduce the low i region and to increase the allowable input. Since the diaphragm of
the well-known bellows-shaped good electromagnetic acoustic transducer is constituted by a
large number of elongated rectangular flat parts EndPage: 1, the central part of the flat part is air
by the vibration of the diaphragm. Due to resistance and inertia, the diaphragm expands and
deforms in the direction opposite to the vibration direction, and at the end of the vibration, the
diaphragm is uniform over the entire surface in order to restore the expansion and deformation
portion by the reduction of air resistance and the elasticity of the diaphragm. Although there was
a drawback that a faithful reproduced sound can not be obtained because it vibrates while
partially deforming without vibration, the present inventors obtained the present invention
without such defects as a result of various experimental studies. It is In the present invention,
partial deformation due to air resistance and inertia of the diaphragm is prevented by applying a
rectangular flat diaphragm made of a thin film formed by arranging many jumbo-shaped
projections in parallel, and all pages By vibrating the plate evenly and further supporting one
opposing side edge or the entire periphery of the diaphragm with an elastic body so that the
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elastic force of the elastic body can increase the amplitude of the diaphragm and obtain a large
output that can be faithful The Hereinafter, embodiments of the present invention will be
described with reference to the drawings. FIG. 1 is an exploded view of a partially removed
diaphragm applied to the present invention, polyester, polyethylene. Diaphragm sheet material
having a thickness of about 10 to 1 ooμ, a thickness of about 1 to 1 ooμm, a thickness of about
10 μm, a thickness of about 10 μm, or a thickness of aso-is, oμ such as polypropylene or nylon
which is relatively insensitive to room temperature. Alternatively, after forming on the surface of
a rectangular thin film 10 such as nonmagnetic metal foil such as titanium or aluminum having a
thickness of about 10 to 100 μ, an insulating thin layer is laminated on the surface forming a
conductor described later Forming a meandering 5-to-one lead wire 5 continuous to the top
portion 3 of the portion 2 'and the portion a /-to be the valley portion 4 and 5 as well as the lead
wire 5 on the back side Conductor 6 is formed with one pitch phase change, and if the top of the
end of conductor 5 is the terminal 5b of conductor 5a of portion 3 'and valley 4 of the end of
conductor 6 on the back surface The terminal 6b is electrically connected to the terminal 6b by
means of an eyelet or other means, and the conductor # 5 and the conductor $ 6 are connected
in series, and then the jumbo-shaped ridges 2 are provided side by side by appropriate forming
means The obtained diaphragm, the conducting wires 5 and 6 of each valley portion 4 of 8 have
an audio current in the same direction. Flow, although the wire 5.6 of the top 3 of semicylindrical ridges 2 flows the opposite direction of the sound current, not affected by the
magnetic flux due to below the magnet.
9.10 U lead wire. The conducting wire 5.6 is formed by known means such as printed wiring and
vapor deposition. In addition, a conducting wire can also be formed only on one side and applied
as a diaphragm. FIG. 2 is a partially exploded development view of another diaphragm applied to
the present invention, which has a meandering shape continuous to the portion 4 'which
becomes the valley portion 4 after being formed on the surface of the thin film 1 made of the
above material. The lead wire 5 similar to the lead wire 5 is formed on the back surface of the
rear portion by forming a lead wire 5 of about 5 to 20 oz. The wire 5m is formed on the portion
3 'of the end of the lead 5 which is continuous with the portion 4' which becomes the valley 4 of
the end of the wire 5 and which becomes the top of the semicircular protrusion 2 of the end. The
terminal 5b of the conductor a5a and the end + 6b of the conductor 6a of the portion 4 'to be the
valley 4 at the end of the conductor 6 on the back surface are connected by means of eyelet or
other suitable means 7. The lead wires 5 and the lead wires 6 are connected in series, and then
the ridges 2 in the shape of an eyebrow are adjacently juxtaposed by appropriate forming means,
and each valley portion 4 of the well-recognized dynamic plate 8a is obtained. Voice current
flows alternately in the opposite direction to the conductors 5 and 6, and the current flowing in
the conductor 5aK is not affected by the magnetic flux due to the magnet described later.
EndPage: 29.10 is a lead wire. The conducting wire 5.6 is formed by known means such as
printed wiring and vapor deposition. The conducting wire can be formed only on one side and
applied as a diaphragm. FIG. 3 is a plan view with partial omission of the electroacoustic
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transducer according to the present invention, and FIG. 4 is an enlarged sectional view along
partial line AA of FIG. 11 is a frame, and supporting portions 12 ° 13 projecting in the lateral
direction from the top 3 in parallel to the jagged 9 ridges 2 of the diaphragm 8 are respectively
provided on the inner surfaces of the opposing side walls of the frame ii The bottom plate 15
having a large number of through holes or grooves 14 opened on the back surface of the
diaphragm 8 is attached to the frame 11 by bonding and fixing with an appropriate adhesive
such as the mounting piece 11m or the frame piece 11bK. Between the valleys 4 where the
conducting wires 5 and 6 of the diaphragm 8 are formed so as not to close the through holes or
grooves 14 properly, the length of each valley 4 is equal to or substantially equal to One or more
rod-like permanent magnets (preferably ferrite permanent magnets) 16 of a length are fixed. The
conducting wire 5 ° 6 of each valley portion 4 is located at the center or substantially the center
of the magnet 16 and the magnetic flux between the magnets 16 is arranged with the magnets
16 generated in the same direction. That is, the magnets 16 magnetized on the same side of each
magnet 16 to the same pole and on the other side to the other pole are as small as possible in the
valley portion 4 within the range where the diaphragm 8 and the magnet 16 do not contact at
the maximum vibration of the diaphragm 8 It is preferable to place them in close proximity.
When an audio current is applied to the lead wires 9 and 10, the diaphragm 8 vibrates over the
entire surface according to the left-hand rule of 7 Lemming by the audio current flowing through
the conductors 5 and 6 of each valley 4 to reproduce the audio. The diaphragm 8 is provided
adjacent to and juxtaposed, and since there are a large number of ridges 2 in the shape of a pot
buried, air pressure caused by vibration and partial deformation by a believer do not occur.
Therefore, high-fidelity reproduced voice can be obtained. As in this embodiment, the support
portions 12 at the both ends of the diaphragm 80 directly fixed to the frame 11 are suitable for
the case of a relatively small size and a small output with small vibration of the diaphragm 8. FIG.
5 is a partially cut away sectional view of another electroacoustic transducer according to the
present invention, and FIG. 6 is a partially cut away sectional view along the line B-B in FIG. For
example, a bellows made of a paper material impregnated with a dumping agent adhered to the
inside of the opposing frame piece n on the upper surface of the frame 21 with a suitable hand,
for example, an adhesive agent, or a synthetic resin. The support portions 12.13 on both sides of
the diaphragm 8 are fixed to the lower surface of the elastic body n, 24 made of a synthetic
rubber sponge body by an appropriate means such as an adhesive, respectively. For example, an
elastic body as described above is formed between the upper surface of the support frame 6.26
fixed by an adhesive or a screw and the support portion 12.13 of the diaphragm 8. The scissors
are inserted and fixed in each case by suitable means, for example an adhesive. The end faces of
the diaphragm 8 at right angles to the tq-shaped ridges 2 are thin so long as they are not
deformed by the vibration of the diaphragm 8 made of a light metal such as aluminum or
titanium. Stick. Support plate! , 28 protruding plate four. (9) is on the same plane as the
supporting portion 12.13 of the diaphragm 8, and the projecting plate 29.30 is placed between
the supporting portion 12.13 and the 11 KlI class piece と and the supporting frames 6, 26. In
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the same manner as in the above, it is held by the same elastic body n, 24. A large number of
through holes or holes 9 opened on the back surface of the diaphragm 8 are attached to the
frame 21. A bottom plate 15 having a through groove 14 is mounted, and the bottom plate 15 is
closed with the through hole or through groove 14 EndPage: 3 The magnets 16 are fixed
between the valleys 4 in which the conducting wires 5 and 6 of the diaphragm 8 are formed as
described with reference to FIG. When an audio current is applied to the lead wire 9.10, the
diaphragm 8 vibrates over the entire surface according to Fleming's left-hand rule by the audio
current flowing through the conductors 5 and 6 of each valley 4 to reproduce the audio current.
The diaphragms 8 consist of a number of semi-cylindrical ridges 2 adjacently arranged side by
side, causing partial deformation due to air pressure and inertia caused by vibration.
Therefore, high-fidelity reproduced sound can be obtained. Furthermore, since the periphery of
the diaphragm 8 is held by the elastic body 24, the large exciter of the diaphragm 8 sufficiently
follows the i movement, and the bass region can be faithfully reproduced, and the allowable input
is also It can be increased. る。 Since the diaphragm applied to the present invention does not
have a flat part and causes air pressure generated by the vibration of the finger moving plate,
deformation due to inertia and restoration of the deformed part at the end of the vibration, a
faithful reproduced voice is obtained. It is possible to significantly improve the soundness and to
improve the acoustical tendency, and in the case where the peripheral edge of the diaphragm is
held by an elastic body, it operates sufficiently well even at a large amplitude, and in particular
reproduces the bass region faithfully. And to increase the allowable input.
4. Brief description of the drawings. FIG. 1 is a partially removed development view of two types
of diaphragms, FIG. 3 is a plan view partially removed, and FIG. 4 is an AA of FIG. 5. FIG. 5 is a
partially cut away sectional view of another embodiment, FIG. 6 is a partially cut away sectional
view taken along the line E--B in FIG. 5, FIG. 7 and 8 are partial cross sectional views of two other
embodiments. 1 ··· Thin integral, 2 ··· ··················································································································· A
long, narrow, and convex ridge. 4 ..... valleys, 5.6 .. self .. wire, 8.8A own diaphragm, 11 ...... frame,
12.13 ..... support. 16 · · · Magnet, 23. 24 · · · · · · Elastic body, 27, 28 river · · · Support plate.
Applicants Sada Fujisawa Agent Nobuaki Nozawa EndPage: 4 Fig. 1 竿 2 Fig. 3 箪 4 笛 6 Fig. 1 "竿
δ Figure EndPage: 5
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