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JPS60242798

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DESCRIPTION JPS60242798
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic speaker apparatus for emitting omnidirectional sound, in particular to a tweeter
or a midrange speaker, and more specifically, it is disposed on both sides of a plane of symmetry
and fixed to common carriers. Coaxially opposite to the drive unit, which is a combination of the
fixed permanent magnet and a moving coil which is elastically and dimensionally held on the
support by a slider and fixed to a dome-shaped vibrating membrane The speaker apparatus
pressure which consists of two similar unit speakers which it has. Prior Art] In the speaker
apparatus of this type known from French Patent No. 1116757, the drive unit of each unit
speaker is disposed in a hemispherical diaphragm, and the moving coil is an outer rim of the
diaphragm. Have a diameter of one-fifth of the diameter of 0 and these are fixed only at the heel
of each vibrating membrane. As a result, an irregular vibration state occurs, and the vibrating
membrane itself is deformed, and in any case, it does not move as a planned hard joint. The effect
of additional spiders should also be totaled xK-, which connects the vibrating membrane to the
permanent magnet of the drive unit along a circle about half the diameter of its outer rim. In
summary, during the movement of the drive membrane by means of the attached moving coil,
the outer rim part of the diaphragm is left behind and a partial oscillation is formed in the
diaphragm. These are the cause of the secondary emission of sound, which does not coincide
with the original sound to be reproduced. Furthermore, in this conventional electrodynamic
speaker device, the carrier portion is continuous outward in the form of a ring, so that the
preferred omnidirectional emission of sound is not possible. Also, both the diaphragms of the
drive unit are always the same. Connected to move in the direction. The unit speakers can not
reproduce different audio signals. U.S. Pat. No. 3,456,755 shows a fluid pressure loudspeaker
device assembled from two hemispherical unit loudspeakers with an electrokinetic drive unit. In
this known device, the moving coil is not rigidly connected to the vibrating membrane, and
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furthermore, the diameter of the moving coil is only one eighth of the diameter of the rim of the
outer shell of the vibrating membrane. U.S. Pat. No. 5,543,767 shows a spherical speaker device
from the outside. Two speakers having a conical diaphragm are arranged in mirror symmetry.
Since acoustic radiation of each unit speaker having a conical diaphragm is performed in a
specific direction, omnidirectional radiation of acoustic waves can not be obtained. Finally,
European Patent Application No. 8127 0017 shows an electrodynamic loudspeaker device
configured in a manner similar to the loudspeaker device described above. This known device is
dedicated to low acoustic frequencies.
In this speaker device, the relationship between the diameter of the moving coil and the diameter
of the outer 14117 mm of the hemispherical diaphragm is 1 to 9. In order to avoid localized
localization of the growth of the vibrating membrane, the hemispherical transmission part is
arranged between the moving coil and the vibrating membrane so that the vibrating membrane is
very tightly coupled to the moving coil. Although this is not done directly, it is achieved by means
of the transmission part installed between them. These known spherical loudspeaker devices do
not give satisfactory results with regard to their acoustic emission. The secondary vibration of
the dome-shaped vibrating membrane appears and this is not removed by light, and the driving
force is very weak compared to the surface of the vibrating membrane. In summary, the results
obtained for acoustic radiation are unsatisfactory-in the current high-power angular tweeter and
midrange speakers, the diameter of the moving coil is approximately equal to the diameter of the
outer rim of the diaphragm. This produces an effective driving force, the secondary resonance of
the vibrating membrane is greatly reduced, and the vibrating membrane vibrates like a rigid body
even in the high range ll'c as a king. These loudspeakers with a dome shaped diaphragm, on the
other hand, do not provide acoustic omnidirectional radiation. [Solution all six problems] Here,
the present invention provides a solution. A known electrodynamic loudspeaker device is known
which eliminates omnidirectional acoustic radiation and achieves effective and accurate
reproduction of the type described above, eliminating the disadvantages of the known
electrodynamic loudspeaker device which carries out omnidirectional acoustic radiation. It is an
object of the present invention to provide a speaker device which is provided under the basic
structure of a speaker, and which is simple in structure and can be easily fixed to a supporting
portion. Solution to the problem and its action and effects Starting from the known
electrodynamic loudspeaker device, the object is to prevent the diameter of the moving coil from
being reduced substantially by the diameter of the outer rim of the diaphragm, the carrier The
ring-like shape is preferably defined by a spherical ring having a diameter slightly smaller than
the outer diameter of the outer rim of the vibrating membrane, or a diameter slightly smaller
than that of the vibrating membrane, or in the case of at least one tweeter. At least two (in the
case of mid-range speakers) protrusions facing in the opposite direction can be achieved by
being able to be coupled to the support unit. The electrodynamic loudspeaker system is
assembled with two dome-shaped unit loudspeakers arranged back-to-back and coupled by a
common ring-like carrier. The shape of this ring-shaped carrier is a defining feature, the chosen
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shape eliminates the reduction of the acoustic pressure in the direction oblique to the direction
of movement of the two diaphragms, and thus an almost complete omnidirectional Acoustic
radiation is obtained.
A difference of up to 20% can be tolerated when adding the diameter of the moving coil so as not
to be too small due to the diameter of the outer rim of the vibrating membrane. In any case, the
diameter of the moving coil should not be smaller than half the diameter of the outer rim of the
vibrating membrane. An approximately equal diameter of the moving coil and the outer rim of
the vibrating membrane is preferred. In contrast to the current known attempts at 1 to make an
omnidirectional loudspeaker device, the area of the diaphragm of the loudspeaker device
according to the invention is the total surface area of the loudspeaker, ie the diaphragm area and
the exposed part of the carrier Relatively small compared to the sum with the area. To date,
omnidirectional speakers have their outer surface area defined almost exclusively by
hemispherical film in every case without exception. The construction method, which has been
adopted as a superior structure at present, does not lead to favorable results, and although it has
a substantial acoustic emission surface that is smaller than the total area of the loudspeaker, the
loudspeaker of the present invention It was confirmed that the device could achieve better
results. The carrier should be made as small as possible. It is the purpose of this carrier to
accommodate and fix the permanent magnets of the two drive units as narrowly as possible.
Further, a spider is attached to the carrier to elastically and sinterably bond the carrier to the
outer rim of the vibrating membrane. At least one, but two oppositely directed projections, ie,
adapters, project from the carrier. Fixing of the speaker is performed by these adapters. In this
way, the omnidirectional radiation performance of acoustics is not adversely affected. In the case
of a tweeter, the loudspeaker has only one adapter and this allows the attachment of the support
part or the midrange loudspeaker to the top. In contrast, the midrange speaker has two adapters
facing in the opposite direction, the upper one for fixing the tweeter and the lower one for fixing
to the support part. Preferably, the carrier is assembled from identical body halves that are
brought together in one plane of mirror symmetry. The halves each have a storage hole for a
permanent magnet, said permanent magnet being held in a great circle with its outside bounding
shoulders with an inwardly projecting shoulder. This makes the loudspeaker device according to
the invention very easy to assemble, especially in that the two halves of the carrier are connected
to one another by means of screws and the two permanent magnets are likewise fixed. If
necessary, an elastic member is installed between the opposite back surfaces of the magnets to
press the magnets against the shoulders. In a preferred embodiment, the projection or adapter is
hollow and can be threaded through the lead for the unit speaker.
These leads are then mechanically protected, while the plug connector may be located within the
projection, the projection or adapter not only serving as a mechanical anchor but also serving as
an electrical connector. . The bayonet socket is very effective because this type of connection
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joint determines the position of the unit speaker. The carrier is bounded by a flat circular ring in
the plane of the spider closest to the 7 spider, which is as small as possible. This flat circular ring
is juxtaposed with the carefully rounded circular portion adjacent to the spherical ring arranged
symmetrically with respect to the mirror symmetry, which reduces the reduction in sound
pressure in the oblique direction. In a preferred embodiment, the carrier comprises a cover ring
which is defined by at least a part of the carrier outer surface and which covers the fixing holes.
This covering serves as masking of the vibrating membrane when the duct for introducing air is
provided, as is known from the German Utility Bill No. 81Q457Q. The duct is found to be
effective for preventing secondary radiation from spiders. In a preferred embodiment, the leads
of each moving coil run outwards separately. Therefore, separate audio signals can be applied to
the two unit speakers of the at-type speaker device. In particular, it is possible to drive two unit
loudspeakers with one electrical signal and the same electrical signal in the opposite phase so
that the two diaphragms can be moved closer or farther away, thus providing omnidirectional
radiation. . In the preferred embodiment of the present invention, in the lower part, the midrange
speaker device according to the present invention is placed below and the small aperture tweeter
according to the present invention is arranged thereon, To move to Other advantages and
features of the present invention will be apparent from the description of the non-limiting
embodiments of the tweeter and mid-range speaker as will become apparent from the following
description and from the claims. EXAMPLE FIG. 1 shows the structure of a tweeter according to
the present invention. This loudspeaker system is assembled from two similar unit loudspeakers
arranged on both sides of the plane of mirror symmetry and each having an electrodynamic drive
unit. Both drive units are coaxially arranged and face in opposite directions. They each have a
permanent magnet @ with an annular gap, for which the strongest magnetic field strength and
magnets of the smallest size are preferably used. A moving coil (C) is inserted into the annular
gap, and carries a coil with a lead wire which receives an applied voltage during use in known
manner.
Moving coil U (U) At its foremost part, it is directly rigidly attached to a domed (hemispherical)
vibrating membrane (C) having an outer rim of a diameter equal to the diameter of the moving
coil (C). If necessary, felt hemispherical pieces (not shown) may be placed inside the vibrating
membrane. The outer rim of the vibrating membrane (c) is resiliently and CWJIQ mounted on a
spider (not shown) K carrier, and the carrier is composed of an inner body partial shaft and a
cover ring (2). Assembled from parts. Equal covering 02 and fitting projections-approximately
equal to each other Vh or internal body part axis with holes are both mirror-symmetrical (IIKarranged-as seen in Fig. 1; The carrier, which is respectively assembled from the two inner body
parts (1) and the two cover rings (2), in the case of the embodiment shown, is a spherical ring
having a diameter equal to twice the diameter of the vibrating membrane). It is limited at the
outer surface (2). The width of this spherical ring face (2) is approximately equal to the distance
between the two unit loudspeakers. The spherical ring face (2) is adjacent to the circular part
(towards) towards the spider, which on the one hand is connected to the flat ring face fiK. In the
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area of this flat ring surface, covering 02 overlaps the outside of the spider and prevents acoustic
radiation from the spider. The space between the spider weir and the cover ring is in
communication with the outside and the air introduction hole). Even better omnidirectional
acoustic radiation is obtained if the diameter of the spherical ring surface (t) is three times the
diameter of the outer rim of the vibrating membrane (c), but a higher ratio should not be chosen.
Each half shell projects from the inner body part 1 and forms with the other inner body part (1) a
projection 2 or an adapter. This adapter (b) is perpendicular to the movement direction of both
diaphragms (c) on the mirror symmetry plane. This K has a bayonet socket and an electrical plug
connector (not shown) attached. Outside the loudspeaker system (lll is protected by a single
hemispherical metal grid @ brow to avoid mechanical bending losses fIk. The four lattice wheels
are located in the direction of movement θ 呻, and are releasably connected at the equatorial
plane facing at a right angle to the mirror symmetry plane −. The lower metal grid-is mounted
on the adapter @ 4 to support the upper grid-. The two inner body parts... Of the loudspeaker
system are secured to one another by means of suitable tensioning devices, for example screws.
The shoulders projecting into the inner scoop 1 of the inner circular body part (f) contact two
permanent magnets (2) with each other under the action of these tension devices, in this example
between the two permanent magnets For example, the soft magnetic foam rubber is placed on a
ring made of rubber) to press the permanent magnet (a) against the cylinder.
In a preferred embodiment, the inner body portion (1) and the cover ring are made of plastic but
do not exclude other materials. FIG. 2 shows the inner body part Φ. The shoulders are not
continuous and have gaps so that the correct positioning of the magnet disk can be co-citorolled
and monitored. In addition, four holes located at equal angular intervals are provided for
attracting the inner body part of the loudspeaker by means of screws. Fixing of the cover ring 0
to the inner body part-is carried out by means of a screw which is screwed into a hole having a
female screw 3. The midrange speaker is assembled in principle in the same manner as the
tweeter described above. However, the carrier also has a second projection 62 which is likewise
arranged in the plane of mirror symmetry and which is coaxially diametrically opposite the first
projection 1 or the adapter. This second adapter IS serves to receive the tweeter adapter and at
the same time contains the electrical connector. As shown in FIG. 3, two bayonet protrusions
project in the same direction so that the acoustic radiation directions of the tweeter and the
attached on-range speaker are in parallel with the motion direction wheel. The inner body
portion (7) of FIG. 3 has an annular notch which is to form a collar which resiliently engages the
permanent magnet so as to secure the permanent magnet along its periphery. FIG. 4 shows two
projections or adapters 646 'of the inner body portion (t) of the midrange speaker. The bonding
of the two inner body parts is different from the bonding method shown in FIG. The internal body
portion □□□ of the midrange speaker is configured such that a space for passage of four
tweeter lead wires in total remains. This space may be formed by a notch-. On the other hand, the
two projections or adapters @ 4 can be connected by means of cylindrical pieces which are fixed
to the device and which form a passage for the tweeter leads. Separate electrical signals may be
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fed to the two moving coils of the midrange speaker. In another embodiment of the above
mentioned, the rings are fixed to one another in a mirror-symmetrical plane 翰) to two
hemispherical metal grids. They are held by a support ring rigidly connected to the inner body
part. This ring is secured to the biased portion of the inner body portion from the spherical ring
surface (d) to the large C diameter and a small number of thin spacers VC. The ring has a wedge
shaped groove, which receives the protective grid). The circular receiving hole formed by the
inner wall of the collar is open towards the center of the loudspeaker and, as seen in FIG. 1,
between the back of the two drive units, ie the back of the two magnets (i) There are no
partitions at all.
As can be seen in FIGS. 1 and 6, the spherical ring face (2) is formed by the inner body portion
and the exposed part of the cover ring and the mirror symmetry plane is a nearly flat ring face. It
extends to the plane determined by θQ. The circular part is relatively small (about 10% of the
distance between the plane (1) and the plane defined in the surface retrorespectively), and the
smooth excess between the spherical ring plane (G) and the flat ring plane The A bayonet groove
ring for receiving the bayonet projection (3) of the tweeter is provided in the adapter I2 of the
medium sound 5 zone speaker.
[0002]
Brief description of the drawings
[0003]
1 is a partially cutaway side view of the tweeter according to the present invention showing the
main part in cross section, FIG. 2 is a side view of the carrier portion of the speaker apparatus of
FIG. 1 excluding the covering, and FIG. FIG. 6 is a cross-sectional view of a half of the
disassembled part of the carrier having the cover for the midrange speaker and the inner main
body part, and FIG. 4 is a front view of the inner body part of the midrange speaker in FIG.
In the figure, 2 0 is a mirror symmetry plane, 22 is a permanent magnet, 24 is a moving coil, 26
vibration F1, 28 hasp, 60 is an inner body part, 32 is a covering, 34 is a protrusion, 66 is a
spherical ring surface Reference numeral 38 denotes a circular portion, 40 denotes a flat ring
surface, 42 an air introduction hole, 44 protrusions or adapters, 48 a lower protective grid, and
50 an upper protective grid. Agent Patent Attorney Shiro Kimura
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