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The present invention relates to a high-pitched speaker, and more particularly to a highfrequency acoustic speaker, which comprises a movable diaphragm and an energizing unit
coupled to the diaphragm, the unit being converted into sound waves. The invention relates to a
high-pitched speaker adapted to change its dimensions in at least two opposite directions under
the action of an electrical signal. This type of high-pitched speaker is also referred to as a
"tweeter". In loudspeakers of the type described above, the diaphragm is usually hemispherical
and is therefore referred to as a spherical loudspeaker. There are, however, also high-pitched
loudspeakers with diaphragms of other shapes, such as funnels. However, these spokers only
transmit sound waves in a specific direction. Therefore, in order to obtain a good stereo or
quadruple sound source effect, it is necessary to direct the sound waves emitted from these
speakers to gather at one point, that is, in one listening area. . The listeners must be located in
this congregation area, which is at first disadvantageous with regard to the spatial arrangement
of the speakers and secondly to the number of listeners in order to wish everyone to be in the
preferred listening area There is a drawback that limitations occur. Furthermore, these known
treble speakers are usually housed in special cabinets, often boxed cabinets. Such a construction
adds cost to the sound reproduction equipment and results in the deposition of considerable
room area. The object of the present invention is to reduce the drawbacks of these known treble
speakers and to improve the loudspeaker of the type mentioned at the outset so that its emission
occurs virtually in all directions, iA construction without the need for special structures To make
it easy to save space and to have good sound quality. These objects are achieved, according to
the invention, by providing a speaker of the above-mentioned type designed as follows. That is, in
the high-tone speaker according to the present invention, the diaphragms are connected to each
other by elastic rings so as to form a nearly spherical closed variable volume, and two
dimensionally stable diaphragms each having a substantially hemispherical shape. It is composed
of a body, and the biasing unit is disposed inside the spherical volume: 1 is fixedly connected to
each dia 7 body, and the impact force from the biasing unit is the boundary of the two
diaphragms. A device is provided which is adapted to be applied to each diaphragm body along a
direction perpendicular to the plane, and which further enhances the atmospheric pressure
inside and outside the closed volume.
The loudspeaker according to the invention acts as a pulsating or vibrating sphere which radiates
sound waves virtually uniformly in all directions when an electrical signal is applied thereto.
There is thus no need for the listener to be positioned in a particular radiation direction of the
sound wave, nor is it necessary to change the height or direction of the skier to adapt to a
particular environment. To avoid the need for radiation only in the specific direction mentioned
above, the treble may be too loud or too small for the listener, for example compared to the bass,
no matter where in the room the sound source is located. There is also a merit to say, not.
Furthermore, the loudspeaker according to the invention produces a large sound output despite
being small. Also, it is not necessary to put the speaker in the enclosure or in the box, and may be
deposited on the base or suspended by a suitable suspension. Other features and advantages of
the present invention are disclosed in the following claims and in the following description of
several embodiments of the present invention illustrated in the attached drawings, which are
merely illustrative. I would like to understand that there is not. The present invention will now be
described in more detail with reference to the accompanying drawings. The loudspeakers shown
in FIGS. 1 and 4 have two non-deformable hemispherical shell-shaped diaphragms (1) and (2)
joined together by an elastic ring (31). An outside seaming method is also possible. The result is
to provide a pulsating or vibrating sphere incorporating a biasing unit (41) fixedly connected to
the two diaphragm bodies (1 ° 2) therein. Hemispherical or cap-like diaphragm body (11 and 2
(2; are made of a very light material which does not deform as much as possible, but in the
embodiment described herein, laminated cardboard is used but plastic You may use a material.
The cardboard is coated with a plastic material, but may instead be impregnated with a resin or
lacquer. Materials such as those used for ping-pong balls may also be used. The rings are made
of rubber but other elastomers may be used instead. The important thing is that the diaplum
body + I + and (soft enough not to interfere with the exercise of (21). When the ring 131 is made
of a non-air-permeable material, at least one vent (not shown) is provided to enhance the
pressure difference between the inside of the spherical closed volume and the outside air. In
order to obtain this pressure balance, a foamed elastomer or a breathable elastic material may be
used. It is essential that the sound waves do not pass from the inside to the outside, as this may
cause an acoustic short circuit with the secondary sound waves.
A crucial advantage of the invention is that the loudspeaker of the invention does not require any
kind of external additions such as sound baffles to prevent acoustical shorts. The biasing unit (4)
is in the form of a tenon and is adapted to stretch and vibrate along the longitudinal direction in
response to the electrical signal to be applied thereto and converted into sound waves. It is
located inside the pulsating sphere so that the generated force is transmitted in a direction
perpendicular to the joint surfaces of the two diaphragms + 11 and Jl: 121 by their longitudinal
vibration. The biasing unit (41 may be as long as the diameter of the sphere formed by the two
diaphragm bodies (1, 2) and fixed directly to the top of these diapars (1, 2) at its both ends It is
also good. However, in this type of construction, unless the diaphragm body (1, 2) is made of a
material of sufficiently stable shape, the biasing unit (41 longitudinal vibration prevents
deformation of these diaphragm bodies in its top area It may not be possible. The deformation of
the diaphragms (1, 2) in the top region results in the individual to induced vibrations occurring in
this top area, and the loudspeaker is now more anisotropic and emits a secondary sound wave.
Therefore, although the absolute value of the amplitude of the longitudinal vibration becomes
smaller, as shown in FIGS. 1 and 4, a slightly short biasing unit (41 is preferable). This biasing
unit is connected to the two diaphragm bodies (1) and +21 via the shape-variable transmission
members (5) and +61 which cross at right angles thereto. These points of attachment are well
separated from the top regions of the two diaplum bodies (11 and (2). As a result, the diaphragm
bodies (1, 2) move sufficiently as a rigid body in response to the longitudinal vibration of the
biasing unit (41) without any change in shape. Preferably, the transfer members 15) and 16) are
coupled such that the diaphragms (1B and (2+ at a cone angle inside) (FIG. 1) are between C and
60 °. As with the diaphragms (1) and (2), the transmission members (5; and (6) are also as light
as possible so as to have a minimal inertial mass, but they do not change their shape without
changing their shape. It must be rigid enough to transfer the applied motion to the die 7'7 ram
body (1, 2). In the example shown, the two transmission members are made of shape-invariant
plastic material, but may also be made of a lightweight metal alloy, in particular drawn aluminum
or the like, for example duralumin.
As shown in FIGS. 1, 4 and 7, the transmission member is in the form of a spherical mid-gap, i.e. a
spherical cap. This shape has the same shape stability as the diaphragm body (1, 2). Furthermore,
it is possible to have an appropriately long and therefore advantageous biasing unit (41) at the
same time by stretching the above mentioned angle 1α). The amplitude of the longitudinal
oscillation of the biasing unit (41 depends on the length as described above and increases with
the length of the biasing unit (11). As shown in FIGS. 1 and 4, each transmission member (5) and
(61 is in the form of a cap in the form of a part of a sphere and is biased on its top) fixedly
connected to the end of +4+ ing. Are the arced end peaks of the caps the respective diapram
bodies (1)? Particularly strongly coupled to 1. The biasing unit (41) in the embodiment shown in
FIG. 1 is made of a rectangular prismatic plate (7) made of a piezoelectric material. Conductive
electrode forming layers (82 and (9) are deposited on the upper and lower two opposing surfaces
of this plate. Two conductors 0I and .alpha.B, which are connected to the electrodes +81 and +91
respectively through the holes provided in the ring 131, are provided for applying to the
electrodes the electrical signals to be converted. . Biasing Unit) When an electric signal is applied
to +41, the biasing unit (41 is a tube made of a piezoelectric material as shown in FIG. 2) to
prevent undesired deformation such as bending vibration. You may make it. The inner and outer
surfaces of the cylinder are in this case coated with a metallic conductive layer to form the
electrodes (81 and (9). A biasing unit 41 made of a piezoelectric material may take the form of a
rod 03 of cruciform cross section to meet the above-mentioned purpose as shown in FIG. In FIG.
4, the biasing unit (41 is made of a rod of circular cross section (or may be another shape such
as, for example, a rectangular cross section), but this rod 1141 is made of polar strain material,
There is a coil (15+ around). This coil is wound around a coil support bobbin of an inner diameter
larger than the outer diameter of the rod u4, and the rod (141 is stretched and contracted in the
longitudinal direction without interference with the coil 09 between the support bobbin and the
rod A sleeve of soft material (171) is located to make it possible. On the other hand, the
longitudinal vibration is not transmitted to the coil 051. Instead of providing a sleeve between
the coil and the rod Q41, it can also be held in the joining plane by means of a suitable holding
member, for example a disk-shaped inner wall. As shown in FIG. 4, the electric signal to be
converted into one sound wave is supplied to the coil 051 through the transformer (the i mark,
but the secondary winding of this transformer passes through the appropriate hole in the ring
(31 There are two conductors 11!
1 and 2 (connected to the terminal of the coil 051). A + f current source c21) is provided 1 for
the polarization of the bar 04+). Instead of polarizing in this way, the rod 114 may be hollow, i.e.
tubular as shown in FIG. In this tubular structure, permanent magnets are provided in the hollow
rod 041 for polarization. When an electrical signal to be converted into sound waves in the above
embodiment is applied to the biasing unit (41) through the conductors (10, 11) or (19, 20), the
biasing unit (41 The amplitudes and frequencies and numbers of the occurrences correspond to
the amplitudes and frequencies of the electrical signal. The forces generated by these
longitudinal vibrations are supplied to the diaphragms (1) and (2) to cause them to reciprocate to
produce ambient air vibrations that can be heard as sound. The diaphragms tl + and (2)
reciprocate in opposite directions in the direction of the longitudinal axis of the biasing unit, but
the acoustic radiation in the direction indicated by IP and G) in FIG. It is almost identical to that
in the direction. In other words, the acoustic radiation from the speakers is isotropic. The
instrument footing value is shown in FIG. Here, the curve 囚 of the sound pressure level ISI is
measured in the direction of the arrows 1 n and U, the force curve IB) shows that in the direction
perpendicular thereto. Both curves IAI and IB + for the frequency range are measured using a
conventional form of measurement device, ie a microphone whose sensing surface has a
diameter of one-quarter inch, ie 6.55 rrm. This microphone was placed at a distance of about 1 m
from the loudspeaker in the direction of the arrow IFI for the curved line and in the direction
perpendicular thereto for the music IB +. The speaker of the present invention tested here has
the following technical characteristics. That is, the two diaphragm bodies (1) and 121 of the
same shape were 4 cm in diameter and formed by half of a ping pong ball. The biasing unit (41 is
made of a rectangular plate made of a piezoelectric material and has a length of about 20 mm). A
ring (° (eye bubbling soft plastic tee-)). Two transfer members +51 and (61 are made of
shiramin and have a diameter of about 11 mn. In the embodiment of FIG. 7 in which the curves
囚 and IB + have a good identity over virtually the entire frequency range, each individual
hemispherical spherical shell diaphragm body (11 and (21 Four small diaphragm bodies (1a)
consisting of a single shell shell (so-called digonous ball).
It is divided into (1b) and (2a) and (2b). In this embodiment, the four small diaphragm bodies (1a)
or 2b) are firstly connected to one another as described above by means of the rings (by the third
eye and then the ring (25) surrounding the equatorial plane) as described above. It is put
together "C. That is, I make M. A biasing unit (41 is a disc c28 of a piezoelectric ceramic material)
is coated with a metal conductive layer forming an electrode on both sides of the disc. , 2-p, for
example, supply electrical signals to the electrodes through holes (not shown) provided in the
rings (3) or (23) at the intersections of the rings. Four hard transmission members connect 17
the end of the disc to four small diapars (Ia) or 2b). This structure is mirror-symmetrical with
respect to the two planes passing through the ring + 31 # and the ring c23). As shown in FIG. 7,
each transmission member (5 ° 6) is made up of a small post (24) and a spherical cap (25). The
small posts (24) are offset by 90 degrees each and one end is connected to the end of the disc
and its small end is fixed to the top of the corresponding cap Q9. The circular circumferences of
these spherical caps are connected to the small diapars (1a) to C2b) in the same way as the
embodiment of FIGS. In this embodiment shown in FIG. 7, the pulsating sphere acts more like an
ideal pulsating ball than the previous embodiment, and instead of using the acoustoelastic ring
(31 or C23), the diaphragms (1) and (21) are used. A labyrinth seal can also be provided at the
boundary between the two. The reason is that the rings (31 and (23 do not need to be centered
on the diaphragms (1) and (2)). A disc-like support positioned orthogonal to the biasing unit (4)
and connected thereto at its center of oscillation may be usefully used to form the labyrinth seal
described above. Diaphragm bodies +1 + and (2; vibrate relative to each other in opposite
directions, in other words, we want to emphasize once again that any diaplum body moves
outward, or any diopram body inward. It is advantageous for the centers of the spheres, which
are composed of two diaplums, to coincide with the centers of the individual diaplums. The
installation of the loudspeaker according to the invention, in particular the suspension,
preferably takes place at the center of the straining unit, preferably at the middle nodal point of
vibration, preferably via the lead CII +, 03, or the ring 131 or You may go directly to C26).
It is to be understood that each of the above-described embodiments is provided solely for the
purpose of illustrating the invention and does not encompass all possible alternatives, and that
no further embodiments may be practiced within the scope of the present invention. It is a place.
Brief description of the drawings
FIG. 1 is a sectional view of a speaker according to the present invention provided with a
piezoelectric type urging unit, FIG. 2 is a sectional view of an embodiment of another
piezoelectric type urging unit, and FIG. 5 is another piezoelectric type urging unit FIG. 4 is a
sectional view of a speaker according to the present invention having a magnetostrictive biasing
unit according to the present invention, and FIG. 4 shows another embodiment of the
magnetostrictive biasing unit. Fig. 6 is a longitudinal sectional view, Fig. 6 is a diagram showing
an example of measurement of a frequency characteristic curve of sound pressure, and Fig. 7 is a
sectional view of a speaker according to the present invention having four small diapars.
il +, + 21-... Diaplum bodies, (1a), (1b). (2a), (2b) ... small diameter diaphragm body, (3) ... elastic IJ
tongue, (41 ... urging unit), 151, 161 ... transmission member, (7) ... piezoelectric Plate made of
substance, 187, +9+: electrode, 01 j, O11 river conductor weight C4: magnetostrictive material
made of Ronde, (151: coil, θ9. (S) Conductor, C22) Permanent magnet for polarization, (24), (25)
Transmission member, (24) Small post, (25) Spherical cap. Attorney Attorney Attorney Attorney
Attorneys General Kimura Shiro 2 Name of the invention Speaker for high-pitched sound
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