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JPH01138895

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DESCRIPTION JPH01138895
[0001]
A. Industrial Field of Application The present invention relates to a speaker device suitable for a
full range speaker. According to a first essential aspect of the present invention, there is provided
a first rigid body of high rigidity and a central portion of the first vibrator, having a suitable
rigidity and being lighter in weight than the first vibrator. In the speaker device including the
second vibrating body, the second vibrating body is formed in a conical shape with the vibration
direction as an axis, and one end side which is the front side in the sound emitting direction is
enlarged and opened. The characteristics of the middle to high range are improved by providing
the closed hollow portion having the diameter reduced at the end side and closed. C6
Conventional Technology Conventionally, as a speaker device called a so-called full range
speaker, for example, a so-called flat speaker using a flat diaphragm is known. As shown in FIG.
5, this speaker device is provided with a vibrator supporting frame 106 by a magnetic circuit
105 including a yoke plate 102, a magnet 103, a voice coil 104 and the like via an appropriate
cambling vibrator 101. The flat diaphragm 107 supported by is driven so as to be able to drive
the flat diaphragm 107 in a wide frequency range. In this speaker device, as shown by B in FIG.
2, the characteristics at a frequency of 100 t (about z to about 5 kHz have substantially flat
characteristics. D1 Problems to be Solved by the Invention As a result of further researches by
the present applicants etc., in the above-mentioned speaker device, when the above-mentioned
flat diaphragm is made into a rectangle having a side of about 75 mm or more, It turned out that
the characteristic of 5 k Hz or more is insufficient. In particular, in the case where an acoustic
reflection plate is disposed in front of the sound emission direction of the speaker device to
diffuse the sound, the sound pressure level of 5 kHz or more needs to be sufficiently secured.
Therefore, the present invention is proposed in view of the above-described circumstances, and
aims to provide a speaker device having a characteristic in which the characteristics of the high
range are improved and the high range of the frequency 5 kHz or more is emphasized. In order
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to solve the problems described in the means for solving the problem 1 and the problems
described above, the speaker device according to the present invention comprises: a first
vibrating body made of a high rigidity material; The vibration body of the I-stroke 2 has an axis
in the vibration direction, provided with a second vibration body which is disposed at the central
portion of the vibration body and which has appropriate rigidity and is lighter than the first
vibration body. Circle 1 (formed in an r shape, characterized in that it has a bottomed hollow
portion in which the diameter of one 52 on the front side in the sound emission direction is
enlarged and the other end is reduced in diameter and closed. Do.
In the speaker device according to the present invention, in the low to middle range, the first
two-foot vibrator vibrates mainly, and in the middle to high range, the second vibrator mainly
vibrates, and the second vibrator The vibration of 5 kl (a characteristic of emphasizing the range
of z or more is realized. G. Examples Hereinafter, specific examples of the present invention will
be described with reference to the drawings. This embodiment shows an example in which the
present invention is applied to a so-called flat speaker. The speaker device according to the
present invention, as shown in FIG. 1, includes a magnetic circuit portion 3 mainly composed of a
yoke plate 1 and a magnet 2 and a vibrator at a predetermined position relative to the magnetic
circuit portion 3. A flat diaphragm 5 supported by the support frame 4 and serving as a first
vibrating body, and a conical vibrating body 6 serving as a second vibrating body disposed at the
central portion of the flat diaphragm 5 are configured as main components. And the vibrating
portion 7. In the 6n pneumatic circuit portion 3, an annular magnet 2 is mounted coaxially with
the projecting portion 1a on one surface of the yoke plate 1 made of a high permeability material
provided with a projecting portion 1a at the central portion on the-surface side. An annular plate
8 is mounted on the magnet 2 and configured. The inner surface of the insertion hole 8a
provided at the central portion of the plate 8 is opposed to the outer surface of the projecting
portion 1a of the yoke plate 1 at a predetermined distance to form an annular magnetic gap 8b.
The plane vibration plate 5 constituting the vibrating portion 7 is made of a material of high
rigidity, is formed in a rectangular shape having a predetermined thickness and size (for example,
-100 to side of side, about 10 mm), There is provided a circular opening 5a of a diameter of. The
circular vibrator 11 is fitted in the opening 5a, and the conical vibrator 6 has a flange 6a formed
on the outer peripheral surface on one end side which is the front side in the sound emitting
direction. It is attached to the periphery of The conical vibration body 6 is formed of a material
having an appropriate rigidity, for example, a material such as RJ polystyrene, foam polystyrene,
foam mylar or the like so as to be lighter than the flat diaphragm 5. The circular ft-shaped
vibrating member 6 is formed in a substantially conical shape in which the diameter is increased
by 1i and the diameter is gradually reduced toward the proximal end, and the-end side is
expanded in diameter and opened inside thereof. It has a so-called horn-shaped bottomed hollow
portion 6b closed with a diameter reduction at the other end side. Then, the circle i (the vibrator
6 is joined to the flat diaphragm 5 so that the axial direction is perpendicular to the flat
diaphragm 5 so that the axial direction of the cone is the vibration direction. . A cylindrical voice
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coil bobbin 9 is attached to the other end of the conical vibrator 6.
A voice coil 10 is wound around the outer peripheral surface of the end of the voice coil bobbin
9. The voice coil bobbin 9 is connected to the flat diaphragm 5 via a compling diaphragm 11,
which is a lightweight diaphragm made of paper, aluminum or the like. The vibrating body
support frame 4 for supporting the vibrating portion 7 configured in this way at a predetermined
position with respect to the magnetic circuit portion 3 is mounted on the plate 8. The opening on
the distal end side of the vibrator supporting frame is substantially the same shape as the flat
diaphragm 5, and is formed to a predetermined size so as to support the flat diaphragm 5 at a
predetermined position. Are suitably bent so as to be attached to the plate 8. The peripheral edge
portion of the flat diaphragm 5 is attached to the peripheral edge portion of the distal end side
opening portion of the vibrator support frame 4 via an edge support member 12 made of a
material having flexibility. Since the vibrating portion 7 is supported at a predetermined position,
the end of the voice coil bobbin 9 on which the voice coil 10 is wound is inserted into the
magnetic gap 8 b. The voice coil bobbin 9 is connected to the vibrator support frame 8 through a
damper 13 made of a flexible material for preventing the vibration of the vibrator 7. When the
speaker device according to the present invention configured as described above is driven by
supplying a drive current to the voice coil 10, the planar vibrations Fi and 5 mainly suppress the
split vibration in the low to mid range and the piston The conical vibration body 6 vibrates
mainly in the high frequency range of 5 kHz or higher. Therefore, the mass of the vibration
system in the high range is lighter than the vibration system in the low to middle range, and
since the conical vibrating body 6 has the shape as described above, As shown by A in FIG. 2, in
particular, the frequency characteristic is improved at a frequency of 5 k Hz or more, and socalled crisp sound quality is obtained. Since the speaker device according to the present
invention has the characteristics as described above, as shown in FIG. 3, by providing the
acoustic reflection plate 14 having a predetermined shape facing the flat diaphragm 5, no It can
be applied to a directional speaker device. The acoustic reflection (for example, the counter 14 is
formed in a quadrangular pyramid from the four reflectors 14a, and is supported so that the
apex of the quadrangular pyramid formed by the four reflectors faces the central portion of the
circle SIL vibrator 6 Be done. The reflecting plate 14a is formed of a hard material so as to reflect
sound efficiently.
The sound emitted from the flat diaphragm 5 and the circular Sft-like vibrator 6 remains in the
high sound pressure level after being reflected by the reflection plate 14a, but the speaker device
according to the present invention Since the high frequency range has an emphasized
characteristic, natural frequency characteristics are maintained even in the reflected sound. The
sound emitted from the flat reflector 5 and the conical vibrator 6 is reflected by the reflectors
14a to change its direction to a substantially right angle as shown by the arrow S in FIG. In the
speaker device configured in this way, if the flat diaphragm 5 is placed so as to be horizontal, the
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same frequency characteristics and sound pressure level can be obtained at any position around
the speaker device. A non-directional speaker device. Further, as shown in FIG. 4, the speaker
device according to the present invention may be configured using the conical vibrating body 15
without the above-mentioned buttocks. The conical vibrator 15 is made of the same material as
the conical vibrator 6 and has a so-called horn-like bottomed hollow portion 15a similar to the
bottomed hollow portion 6b. In this example, the conical vibrator 15 is fitted in the opening 5a,
and an elastic emulsion adhesive or the like as a dumping material is used as a dump material
between the conical vibrator 15 and the flat diaphragm 5. The first and second vibration units 7
are connected by an adhesive 16. As the adhesive 16, for example, 5C-801 (trade name;
manufactured by Sony Chemical Co., Ltd.) can be used. In place of the adhesive 16, neobrene
sponge or the like may be used. As described above, the speaker device according to the present
invention includes the first vibrating body and the light-weight second vibrating body, and the
second vibrating body is a cone whose axis is in the vibration direction. The one end side which
is the front side in the sound emission direction is expanded in diameter and opened, and the
other end side is closed and the bottom end is a closed hollow portion closed. Therefore, the first
vibrating body mainly vibrates in the low to middle range, and the second vibrating body mainly
vibrates in the high tone range. The vibration of the second vibrating body improves the
characteristics of the high range, and in particular, the characteristics in which the range of 5 kllz
or more is emphasized can be realized. The speaker device according to the present invention
compensates for the above-mentioned characteristics to compensate for the sound pressure
range of 5 kHz or more, which is smaller than the actual sound pressure level by a sound
pressure level, and provides natural sound. Even in the case where the sound is expanded 1141
using a plate or the like, a good sound with little loss of the high range can be provided.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a longitudinal sectional view showing the configuration of the speaker device according
to the present invention, FIG. 2 is a graph showing frequency characteristics of the above speaker
device and the conventional speaker device, and FIG. 3 is an application of the above speaker
device It is a perspective view which shows an example, FIG. 4 is a longitudinal cross-sectional
view which shows the other structural example of the said speaker apparatus.
FIG. 5 is a longitudinal sectional view showing the configuration of a conventional speaker
device. 1
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··· Vibration body support frame 5 ···· ----- first flat diaphragm 6 which is a vibrating body ........
second vibrator to become conical vibrator 6a · · · · · · bottomed hollow portion 7 ... ··············
Vibration part
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