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JP2000261889

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DESCRIPTION JP2000261889
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
linear sound source, plane wave, full drive, partial or full band faithful reproduction
electromagnetic acoustic transducer.
[0002]
2. Description of the Related Art A cone-shaped diaphragm and a ring-shaped movable ring in the
center are driven by magnets in a cone-shaped diaphragm, which has been used for the longest
time (over 70 years).
[0003]
The above-mentioned conventional dynamic cone speaker is a point sound source and thus
becomes a spherical wave, and the cone is divided and vibrated. Therefore, one sound source due
to diffuse reflection etc. becomes several sound sources and stimulates the tympanic membrane
several times From this point, it becomes a so-called speaker sound that can not faithfully
reproduce the original sound, and furthermore, the diaphragm edge due to the use of a roll edge
is in reverse phase, and is canceled at a constant frequency and the sound disappears.
Therefore, the entire band of 20 Hz to 20 kHz can not be obtained with one speaker, and two to
three tones for bass, middle tone, high tone, etc. have to be used. In addition, the shape is mainly
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circular, in rare cases elliptical, and it has a wide area, and a structurally heavy magnet protrudes
later and has a center of gravity far from the mounting part, so it vibrates the box to be stored As
a result, a box with a wide and thick shape is required.
[0004]
In recent years, although liquid crystal, plasma, screen television, etc. have become thin and
speakers have become thin, the width is still wide and high sound quality can not be obtained,
and improvements are strongly demanded. The inventor has been engaged in the development of
a flat speaker for many years and has made a number of inventions, but since all of them were
flat sound sources, the above-mentioned drawbacks could not be overcome.
[0005]
This time, from the above-mentioned requirements, we have experimentally made it several times
experimentally and have succeeded from the surface sound source to the line sound source in
order. In the dynamic cone speaker, even if the voice coil moves as signaled, the cone paper for
reproducing voice operates with delay, and it is divided and vibrated, and it is controlled by the
damper, the transient characteristic is bad, and the original sound can not be reproduced. The
point sound source becomes an instant spherical wave, and the sound spreads spherically. The
sound wave of a spherical wave does not match the sound pressure and the vibrating particle
velocity, and therefore, the phase is different, and it becomes near to a plane wave only when it is
sufficiently far. The line sound source and the surface sound source are both plane waves, and
the sound pressure and the vibrating particle velocity are in the same phase from the beginning.
[0006]
SUMMARY OF THE INVENTION The present invention proposes a linear sound source which is
the opposite of a spherical wave, a plane wave, and a full drive system (without divisional
driving) as a mechanism in a radical reform, and the length relative to the transverse width The
vibration is elongated by a peripheral holding member such as a roll edge which is integrally
provided with one or two or more of the movable coil in the longitudinal direction integrally on
one side of an elongated diaphragm having five times or more An electroacoustic transducer is
provided which holds the plate in a vibrating manner and arranges one or more of the movable
coils in a magnetic field.
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[0007]
The movable coil may be elongated along the longitudinal direction of the elongated diaphragm.
[0008]
The elongated diaphragm may be bonded to a peripheral edge holding member of the bellowslike edge facing the peripheral edge thereof to vibratably hold the elongated diaphragm.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Two elongated movable rings
along the longitudinal direction of the elongated diaphragm are integrally provided in a
longitudinal direction on one surface of the elongated diaphragm having a length of 5 times or
more the width. An electro-magnetic acoustic device comprising a peripheral holding member of
a bellows-shaped edge facing the peripheral edge of an elongated diaphragm adhered to
vibratably hold the elongated diaphragm and arranging two of the elongated movable coils in a
magnetic path. converter.
[0010]
DESCRIPTION OF THE PREFERRED EMBODIMENT The linear acoustic source, plane wave, full
drive type, partial band or full band faithful reproduction electromagnetic acoustic transducer
according to the present invention will be described based on the drawings of the embodiment. It
becomes an absolute requirement.
FIGS. 1 to 3 show an example of the structure of an electromagnetic acoustic transducer 1 for
partial band faithful reproduction.
As the elongated diaphragm 2 satisfying the entire drive, one having a length of 5 times or more
the width is used, and the movable wire 3 integrally attached to the elongated diaphragm 2 is
along the elongated diaphragm 2. An embodiment is shown in which an elongated mold is
illustrated and two are arranged in the longitudinal direction, and it is a requirement that the
elongated diaphragm 2 and the movable coil 3 are integrally driven so as not to divide and
vibrate.
Although not shown, the movable wire ring 3 may be round and the number thereof may be one.
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In particular, when the movable wire 3 is round, in order to improve the characteristics of
faithful reproduction, two or more, and some of the movable wire 3 are attached. The peripheral
edge of the elongated diaphragm 2 connects the inner edge of the roll edge 4 and holds it
vibratably. As the permanent magnet 5 constituting the magnetic circuit, a very strong magnet
such as neodymium magnet can be available at relatively low prices in recent years, and thin,
small, rectangular magnets can be used. The magnetic field 8 is made stronger, and the coil
portion 3a of the movable coil 3 is disposed in the magnetic field 8. Then, in the first
embodiment, the outer case of the roll edge 4 is held by the base case 9, and the permanent
magnet 5 and the iron pole pieces 6, 7 are supported, and the coil portion 3a of the movable wire
3 is disposed. The magnetic field 8 is configured as required. A drive current is supplied from the
terminals 10a and 10b. 11a is an escutch, 11b is a speaker box left side plate, and 11c is a
speaker box right side plate.
[0011]
The second embodiment shown in FIGS. 4 to 6 is a full-band faithful reproduction electroacoustic
transducer 12 for achieving particularly faithful reproduction, and the elongated diaphragm 13
similar to the first embodiment is used in the second embodiment. Two movable coils 14 similar
to the elongated movable coil 3 were installed in series, and Japanese paper according to the
inventor's invention was folded on the front and back of the periphery of the elongated
diaphragm 13 and impregnated with silicone resin. The bellows-shaped edges 15a and 15b are
bonded in a face-to-face manner and suspended, and the coil portion 14a of the movable coil 14
is disposed in a strong magnetic field 19 constituted by permanent magnets 16 and iron pole
pieces 17 and 18. . Thus, the elongated diaphragm 13 moves up and down reliably, and the
bellows type edges 15a and 15b both have stretch resistance at the upper limit and the lower
limit, so there is no need for a damper, no opposite phase occurs, and the elongated diaphragm
13 As the original signal rises and falls instantaneously as the original signal, the transient
characteristics become excellent, and faithful reproduction of the original sound is made
possible, resulting in the structure of the full-range faithful reproduction electromagnetic
acoustic transducer 12.
[0012]
In FIGS. 3 to 6 of the second embodiment, 20 is a base case, 21a and 21b are terminals, 22a is an
escutch, 22b is a speaker box left side plate, and 22c is a speaker box right side plate.
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4
[0013]
Although the elongated diaphragm 2 in the first embodiment and the elongated diaphragm 13 in
the second embodiment are both used by cutting a strong and flexible synthetic resin sheet in a
necessary manner, such as balsa wood It is possible to vibrate even using a thick member.
[0014]
The winding frame 3b of the movable wire ring 3 in the first embodiment and the winding frame
14b of the movable wire ring 14 in the second embodiment are both made of paper or
aluminum, and the winding frame 3b and the winding frame 14b The electric wire is wound
around the circumferential surface thereof, and fixed to the elongated diaphragm 2 and the
elongated diaphragm 13 respectively.
[0015]
According to the second embodiment of the present invention, when considering a prototype
electromagnetic acoustic transducer, the reproduction frequency characteristic is 40 Hz to 40
kHz, the sound pressure level is 88 db / 1 w / 1 m, the distance between linear sound sources.
The attenuation is -3 db / dd according to theory, and the spherical wave is -6 db / dd.
And because the diaphragm is fully driven, it has good rising and falling characteristics, very
good transient characteristics (tone burst characteristics), and because it is a plane wave, the
original sound can be faithfully reproduced, and a single bass from super low tone It has become
a rare electromagnetic acoustic transducer that can be
In addition, the electromagnetic acoustic transducer according to the first embodiment of the
present invention is also excellent as a speaker of partial band faithful reproduction.
[0016]
The electromagnetic acoustic transducer according to the present invention is thin, light and
elongated as a practical product and has an ideal shape as well as high sound quality. In the wide
range of applications such as in-vehicle use, for home use, for general high-end audio and for
professional audio, it will be a new product expected in the 21st century.
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