JPH01270488

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DESCRIPTION JPH01270488
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker whose sound emission direction is made non-directional by making the diaphragm
spherical. 2. Description of the Related Art Conventionally, a well-known cone speaker is
mentioned first as a speaker. Although the cone speaker is emitted from the opening of the coneshaped diaphragm, the diaphragm has a conical shape, so it is strongly emitted in the direction of
the opening, but the magne forming the drive unit of the voice coil Almost no noise is emitted in
the direction of-/), and it has directivity. On the other hand, there is also a flat speaker in which
the diaphragm is flat, but although this flat speaker is strongly emitted in the thickness direction
of the diaphragm, it is hardly emitted in the direction perpendicular to the plane of the
diaphragm, It has directivity as a cone speaker. [Problems to be Solved by the Invention]
Although these cone speakers and flat speakers are usually installed and used in a room, since
they have directivity as described above, all over the room, to every corner It was not possible to
transmit sound emission contents well by transmitting sound waves. In addition, it was not
possible to emit sound in all directions using these speakers outdoors as well. Therefore, an
object of the present invention is to provide a speaker in which nondirectional characteristics can
be obtained with a simple configuration. [Means for Solving the Problems] The present invention
solves the problems described in iiI, and in order to achieve the above objects, the first and the
second are opposed to each other across the center on the inner surface of a spherical
diaphragm having a hollow portion. A coil characterized in that two coils are disposed and a
voice (a source 3 is connected to one of the first and second coils and a direct 7 A power source
is connected to the other coil) It is. The third and fourth coils face each other on the inner side of
the spherical diaphragm having the hollow portion with the center on the opposite side, and are
perpendicular to the line connecting the first and second coils and the coil positions with the
center in the third and fourth The coils are disposed to face each other, and an audio signal
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source is connected to the first and third coils, and a DC power supply is connected to the second
and fourth coils. The spherical diaphragm may be a speaker formed by joining a pair of
hemispherical diaphragms. [Operation] According to the present invention, since the coil
magnetized by the audio signal source and the coil magnetized by the direct current power
source are attracted and repelled by the means as described above, the spherical diaphragm
vibrates and the sound wave like a dot It operates as a source and can emit noise in a
nondirectional manner. Embodiments of the present invention will now be described in detail
with reference to the drawings.
FIG. 1 is a cross-sectional view of a first embodiment of the present invention, in which 1 is a
speaker as a whole, 2 is a spherical diaphragm having a hollow portion 3, and 4 is a sound
absorbing material disposed in the hollow portion 3. It is. The sound absorbing material 4 may
not be disposed, and the hollow portion 3 may be filled with air. 5.6 are first and second coils
disposed opposite to each other on the inner side surface 2a of the spherical diaphragm 2 across
the center O, and the audio signal source 7 is connected to one of the coils 5, the other The DC
power supply 8 is connected to the coil 6 of The other coil 6 is magnetized so that the side facing
the one coil 5 in the predetermined direction is, for example, the N pole. Next, the operation of
the speaker of the present invention having the above-described configuration will be described.
When an audio signal is supplied from the audio signal source 7 to one of the coils 5, an
alternating magnetic field is generated in the vicinity of the coil 5, and the coil 5 and the other
coil 6 magnetized by the DC power supply 8 repeat attraction and repulsion. As a result, the
spherical diaphragm 2 vibrates and is emitted. More specifically, when the current from the
audio signal source 7 is supplied to the coil 5, the side of the coil 5 facing the coil 6 becomes an
N pole in a half cycle, and the coil 5 and the coil 6 repel each other to generate spherical
vibration. The plate 2 shifts radially outward and the entire loudspeaker l expands. In the next
half cycle, the side of the coil 5 facing the coil 6 becomes the S pole, the coil 5 and the coil 6
attract each other, the spherical diaphragm 2 shifts radially inward, and the entire speaker l
contracts. By turning back the expansion and contraction, the spherical diaphragm 2 vibrates and
is emitted. Here, since the outer side surface of the spherical diaphragm 2 is a spherical surface,
the sound wave emitted from the speaker 1 as a sound source propagates uniformly according to
the distance from the speaker 1 and propagates in a so-called omnidirectional manner. Thereby,
when the speaker 1 is installed in a room, the sound emission content can be transmitted to all
places in the room and every corner, and when installed outdoors, the sound emission content
can be transmitted easily and surely in all directions. be able to. FIG. 2 is a cross-sectional view of
the second embodiment of the present invention, in which the first and second coils 5 and 6 are
opposed to the inner side surface 2a of the spherical diaphragm 2 with the center 0 interposed
therebetween, The third and fourth coils 9 and 10 are installed opposite to each other across the
center 0 orthogonal to the line connecting the two coils, and one of the coils of the coil 9.10, in
this example, the coil 9 is an audio signal tJg7 The second embodiment is different from the first
embodiment in that it is connected in the same phase as 5 and the DC coil a8 is connected to the
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other coil, in this example, the coil 10. Also in this embodiment, the spherical diaphragm 2
vibrates in the same manner as in the previous embodiment, and becomes nondirectional.
FIG. 3 is a cross-sectional view of a third embodiment of the present invention, in which a pair of
hemispherical diaphragms 2b and 2c are joined to these via a damper 11 to form a spherical
diaphragm; This is different from the first embodiment. In this example, the spherical diaphragm
2 and the speaker 1 can be easily manufactured. FIG. 4 is a cross-sectional view of the fourth
embodiment of the present invention, in which the spherical diaphragm in the second
embodiment shown in FIG. 2 is replaced with a tumbler 11 between a pair of hemispherical
diaphragms 2b and 2c. This embodiment differs from the second embodiment in that it is formed
by bonding. Also in this example, the spherical diaphragm 2 and the speaker 1 can be easily
manufactured. As described above, according to the present invention, the outer surface of the
diaphragm can be formed into a spherical surface, and the sound waves emitted from the
speaker as a point-like sound source are uniform according to the distance from the speaker. In
non-directional transmission, when the speaker is installed in the room, the sound emission
content can be transmitted at every corner of the room, and when the speaker is installed
outdoors, the sound emission content is omnidirectional It can be transmitted easily and reliably.
When the third and fourth coils are disposed orthogonal to the first and second coils, the
directivity of the speaker can be improved. When the spherical diaphragm is constituted by a
pair of hemispherical diaphragms, manufacture of the speaker is facilitated.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of the first embodiment of the speaker according to the present
invention, FIG. 2 is a cross-sectional view of the second embodiment according to the present
invention, and FIG. 3 is a cross-sectional view of the third embodiment according to the present
invention FIG. 4 is a cross-sectional view of a fourth embodiment of the present invention.
2 ... spherical diaphragm 2a ... inner surface 2b of spherical diaphragm, 2c ... hemispherical
diaphragm 3 ... hollow portion 5 ... first coil 6 ... second coil 7 ... Audio signal source 8 ... DC
power supply 9 ... Third coil 10 ... Fourth coil Fig. 1
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