JP2001078292

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DESCRIPTION JP2001078292
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat drive speaker device, and more particularly to a flat drive speaker device having an extremely
thin shape and capable of obtaining good frequency characteristics.
[0002]
2. Description of the Related Art A speaker device is generally a bookshelf type, and for example,
as shown in FIG. 11, a front plate 1a provided at the front opening of an enclosure 1 formed of
an open box type. 12 is provided with bass unit 2, medium tone unit 3 and treble unit 4 that
divides and receives an audible audio frequency band, and a bass reflex duct 5 is provided below
it, and its internal structure is shown in FIG. As shown in FIG. 1, the connection terminal 6 is
provided on the back plate of the enclosure 1 having the sound absorbing material 9 filled
therein, and the audio signal supplied thereto is divided into three frequency bands (bass, middle)
by the divider circuit 7. The signals of the respective bands are supplied to the "bass unit 2, the
middle tone unit 3 and the treble unit 4" through the connection line 8.
[0003]
Recently, thin speaker devices have been required to be made thin, and thin speaker devices have
been developed by various methods. However, since an enclosure is required, it is necessary to
make the book shelf type speaker device thin. There is a limit of
[0004]
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[0004] For this purpose, a flat panel drive type in which a drive unit comprising a piezoelectric
vibrating element is coupled (adhered) to a flat panel-like diaphragm itself without using an
enclosure, thereby driving the diaphragm to emit sound. Speaker devices exist.
[0005]
For example, as disclosed in Japanese Utility Model Application Laid-Open No. 3-9596, a
piezoelectric sounding body is used as a vibrating element constituting the above-mentioned
drive unit, or it is disclosed in Japanese Patent Application Laid-Open Nos. 55-147900 and 4114600. There is an example in which a thin speaker device is realized using a piezoelectric
bimorph element.
[0006]
[0006] Since these speaker devices are constructed by attaching a piezoelectric vibration
element, etc., the reproducible frequency band is narrow. For example, the frequency f (kHz) and
the output SPL (dB) shown in FIG. It is only possible to reproduce from around 0.75 kHz to
around 20 kHz as in the above, and therefore it is not very satisfactory as a home-use stereo
device, and very limited special fields such as computer game machines etc. Even if the
reproduction voice band of is narrow, it is used for devices that have no practical problems.
[0007]
Although the conventional flat drive type speaker device has an advantage that the overall shape
of the device is extremely thin, it emits sound using a piezoelectric vibration element. Therefore,
there is a fundamental problem that the reproducible frequency band can not be broadened, and
this improvement is eagerly desired.
[0008]
Therefore, it is an object of the present invention to keep the thin shape substantially the same as
in the conventional flat drive type speaker device using the piezoelectric vibration element
without losing it, and to widen the reproducible frequency band. It is an object of the present
invention to provide a wide-range flat drive type speaker device to the extent possible.
[0009]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention adopts the characteristic constitution as described below.
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[0010]
(1) A drive unit is coupled to a flat panel-like diaphragm, and a flat drive speaker device is
produced by emitting the sound by driving the drive unit. A drive unit having a voice coil portion
when driven in a follow-up manner, a coupling portion for coupling the voice coil portion to the
plate surface of the diaphragm, and an axial drive by the voice coil portion are permitted, and in
a radial direction And a support member for supporting the drive unit on the diaphragm in a
state in which the drive is inhibited.
[0011]
(2) The drive unit of (1) is composed of an external magnet type magnetic circuit.
[0012]
(3) The drive unit of (1) is composed of an internal magnet type magnetic circuit.
[0013]
(4) The drive unit of (1) is composed of a repulsion type magnetic circuit.
[0014]
(5) The diaphragm according to any one of (1) to (4) is configured such that the peripheral
portion of the diaphragm is supported by the frame.
[0015]
(6) The diaphragm of (5) is configured such that the peripheral portion of the diaphragm is
supported by the frame through the supporting edge portion.
[0016]
(7) The frame according to any one of (5) to (6) includes a leg connected to the bottom of the
frame.
[0017]
(8) The diaphragm or the frame of any one of (5) to (7) includes a mounting bracket for
installation on a wall surface or the like.
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[0018]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in detail below with reference to FIGS.
First, a first embodiment of the present invention will be described with reference to FIG.
That is, the drive unit 11 provided on the flat diaphragm 10 is formed of an external magnetic
type magnetic circuit, and the magnet 12 made of a ferrite material of the drive unit 11 is formed
of a thick plate-like ring plate A yoke pole 13 is attached, and a cylindrical portion from which
the tip of the yoke pole 13 protrudes is formed.
[0019]
A thick plate-like ring plate is formed on the upper circumferential surface of the cylindrical
portion, and the inner circumferential surface of the opening of the plate 14 is disposed with a
predetermined magnetic gap, and the voice coil portion is formed in the magnetic gap 15 is
disposed so as to be movable in the axial direction of the cylindrical portion, and is configured to
be able to vibrate by feeding an audio signal to the voice coil portion 15.
[0020]
The upper surface of the voice coil portion 15 is connected to the lower surface of the flat
diaphragm 10 by a bonding portion formed using an adhesive or the like, and the whole of the
drive unit 11 is flat with the upper surface of the plate 14. The lower surface of the diaphragm
10 is connected via a ring plate-shaped support member 16 made of a sponge material.
[0021]
The support member 16 supports the drive unit 11 on the flat diaphragm 10 in a state in which
axial drive by the voice coil portion 15 is permitted and radial drive is inhibited.
[0022]
The driving unit 11 supports the flat diaphragm 10 so that the upper surface of the cylindrical
portion of the yoke pole 13 has a slight gap, that is, a gap of a value sufficient to allow the
driving stroke of the voice coil portion 15 to be tolerated. It is supported using a member 16.
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[0023]
Therefore, when the voice coil section 15 is driven in the magnetic gap formed between the yoke
pole 13 and the plate 14 by supplying an audio signal to the coil of the voice coil section 15, the
vibration is generated. The sound is transmitted to the flat diaphragm 10 and a predetermined
sound is emitted.
[0024]
Next, a second embodiment of the present invention will be described with reference to FIG.
In this embodiment, the drive unit 17 connected to the flat diaphragm 10 is configured by an
internal magnetic type magnetic circuit, and the upper surface of the columnar magnet 12 made
of neodymium material of the drive unit 17 is thick. A disk-shaped yoke pole 13 is fixed, and the
circumferential surface of the yoke pole 13 and the inner circumferential surface of the plate 14
on the ring plate are disposed with a predetermined magnetic gap, and the voice coil is disposed
in the magnetic gap The portion 15 is disposed movably in the thickness direction of the yoke
pole 13 and is configured to be able to vibrate by passing an audio signal to the voice coil
portion 15.
[0025]
The upper surface of the voice coil portion 15 is connected to the lower surface of the flat
diaphragm 10 by a bonding portion formed using an adhesive or the like, and the whole of the
drive unit 17 is in plane vibration with the upper surface of the plate 14 The lower surface of the
plate 10 is connected via a ring plate-like support member 16 made of a sponge material.
[0026]
The support member 16 supports the drive unit 17 on the flat diaphragm 10 in a state in which
axial drive by the voice coil portion 15 is permitted and radial drive is inhibited.
[0027]
The drive unit 17 supports the flat diaphragm 10 so that the disk upper surface of the yoke pole
13 has a slight gap, that is, a gap of a value sufficient to allow the drive stroke of the voice coil
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portion 15 to be tolerated. It is supported using 16.
Further, in this configuration, since the plate 14 is covered on the outer periphery of the
magnetic circuit, it also serves as a magnetic circuit cover.
[0028]
Therefore, when the voice coil section 15 is driven in the magnetic gap formed between the yoke
pole 13 and the plate 14 by supplying an audio signal to the coil of the voice coil section 15, the
vibration is generated. The sound is transmitted to the flat diaphragm 10 and a predetermined
sound is emitted.
[0029]
Next, a third embodiment of the present invention will be described with reference to FIG.
In this embodiment, the drive unit 18 connected to the flat diaphragm 10 is configured of a
repulsion type magnetic circuit, and two columnar magnets 12 a of the neodymium magnet
portion of the drive unit 18 are provided. 12b, and the plate 14 is sandwiched between the
magnets 12a and 12b, and the outer peripheral surface of the plate 14 and the inner peripheral
surface of the member 18a are disposed with a predetermined magnetic gap, and the voice coil is
formed in this magnetic gap. The portion 15 is disposed movably in the thickness direction of the
plate 14 and is configured to be able to vibrate by passing an audio signal to the voice coil
portion 15, and the upper surface of the voice coil portion 15 is from the coil forming portion It
is integrally formed with the thin disc portion extended upward.
[0030]
The thin disk portion provided on the upper surface of the voice coil portion 15 is connected by
a connecting portion formed on the lower surface of the flat diaphragm 10 using an adhesive or
the like, and the entire drive unit 18 is It is connected via a support member 20 provided
between the lower surface of the flat diaphragm 10.
[0031]
The support member 20 supports the drive unit 18 on the flat diaphragm 10 in a state in which
axial drive by the voice coil portion 15 is permitted and radial drive is inhibited.
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[0032]
If each of the magnets 12a and 12b is made of a neodymium material, it is possible to reduce the
thickness and size and weight.
[0033]
Therefore, when the voice coil unit 15 is driven in the magnetic gap formed on the outer
periphery of the plate 14 by supplying an audio signal to the coil of the voice coil unit 15, the
vibration is generated by the voice coil unit 15. Is transmitted to the flat diaphragm 10 from the
thin disc portion of the disc, and predetermined sound output is made.
[0034]
In the flat drive type speaker apparatus constructed by using such a drive unit 18, the drive unit
18 does not use a piezoelectric vibration element as in the prior art, and is a drive in a voice coil
form. Therefore, the reproducible frequency band can be broadened, and the reproduction from
around 0.15 kHz to around 20 kHz can be made almost flat like frequency f (kHz) and output
SPL (dB) shown in FIG. As a stereo device of
[0035]
Next, a fourth embodiment of the present invention will be described with reference to FIG. 5 and
FIG.
While this embodiment is configured such that the peripheral portion of the flat diaphragm 10 to
which the drive unit 11 according to the first embodiment described above is connected is
supported by the frame 21, as shown in FIG. The outer peripheral surface of the flat diaphragm
10 is supported on the inner peripheral surface of the frame 21 through a connecting portion 10
a fixed using an adhesive or the like.
[0036]
Of course, instead of the drive unit 11, the drive unit 17 described with reference to FIG. 2 may
be used, or the drive unit 18 described with reference to FIG. 3 may be used.
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[0037]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
This form is configured such that the peripheral portion of the flat diaphragm 10 is supported by
the frame 21 formed of wood, resin, metal or the like, and this form of support is shown in FIG.
The outer peripheral surface of the inner peripheral surface of the flat diaphragm 10 and the
outer peripheral peripheral surface of the flat diaphragm 10 are supported via a folded support
edge portion 10 b that buffers in the vibration direction of the flat diaphragm 10.
[0038]
By virtue of such construction, the vibration damping of the flat diaphragm 10 can be extremely
reduced, and the drive stroke of the vibration can be made large.
[0039]
Next, a sixth embodiment of the present invention will be described with reference to FIG.
This embodiment is configured to include the leg 22 connected to the bottom of the frame 21
described above, which is convenient when installing a flat drive speaker device on a floor
surface and is stable in installation. The speaker device can be adapted to both wall surface
installation and floor surface installation of the speaker device if the leg portion 22 is configured
to be detachable from the frame 21.
[0040]
Next, a seventh embodiment of the present invention will be described with reference to FIGS. 9
and 10. FIG.
In this embodiment, the flat diaphragm 10 described above is provided with a mounting bracket
for installation on a wall surface or the like, as shown in FIG. 10 on the back surface of the flat
diaphragm 10 (on the mounting surface side of the drive unit 11). In the mounting bracket 23,
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mounting holes 23a, 23a are drilled at the respective bases of the strip plates, and are bent so
that the middle portion of the strip plate protrudes, and wall mounting holes are formed in the
projecting portions 23 b is provided, and when mounting the flat drive type speaker device
consisting of the flat diaphragm 10 supported by the frame 21 and the drive unit 11 on a wall
surface, a screw protruding on the wall surface is attached and attached to this screw By hooking
the wall mounting hole 23 b of the metal fitting 23, it can be suspended and held securely.
The mounting bracket 23 may be attached to the frame 21.
[0041]
The flat diaphragm 10 in each embodiment described above has a function as an ornament by
providing a decoration such as a picture on its surface, or sticking or sandwiching a sheet such as
a photograph or a printed matter on the surface. It is also possible to
[0042]
Of course, the present invention can also be achieved by connecting the drive unit of the present
invention to a normal (made-up) photographic panel or the like and providing the photographic
panel or the like with a function as a flat diaphragm.
[0043]
As is apparent from the above description, the flat drive speaker device according to the present
invention is constituted by a voice coil type drive unit without using a piezoelectric vibration
element as in the prior art. As a result, the reproducible frequency band can be made
significantly wider than before, and particularly, the frequency improvement in the low band is
remarkable.
[0044]
Therefore, it is possible to keep the thin shape substantially the same as that of the conventional
flat drive type speaker device using the piezoelectric vibration element without losing it, and to
widen the reproducible frequency band, and also to be versatile. A wide planar drive type speaker
device can be provided.
[0045]
Brief description of the drawings
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[0046]
1 is a partially broken perspective view showing a schematic configuration of a flat drive speaker
device according to a first embodiment of the present invention.
[0047]
FIG. 2 is a side sectional view showing a schematic configuration of a flat drive speaker device
according to a second embodiment of the present invention.
[0048]
3 is a side sectional view showing a schematic configuration of a flat drive speaker device
according to a third embodiment of the present invention.
[0049]
4 is a characteristic diagram showing the reproducible frequency of the flat drive speaker device
shown in FIG.
[0050]
5 is a front view showing a schematic configuration of a flat drive speaker device according to a
fourth embodiment of the present invention.
[0051]
6 is an enlarged perspective view showing a connection state of the flat diaphragm and the frame
shown in FIG.
[0052]
7 is a perspective view showing a connection state of the flat diaphragm and the frame of the flat
drive speaker device according to the fifth embodiment of the present invention. FIG.
[0053]
FIG. 8 is a perspective view showing a flat drive speaker device according to a sixth embodiment
of the present invention.
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[0054]
9 is a front view showing a flat drive speaker device according to a seventh embodiment of the
present invention.
[0055]
10 is an enlarged perspective view of the mounting bracket shown in FIG.
[0056]
FIG. 11 is a front view showing an example of the appearance of the conventional bookshelf type
speaker device.
[0057]
12 is a side sectional view showing an internal structure of the bookshelf type speaker device
shown in FIG.
[0058]
FIG. 13 is a characteristic diagram showing an example of reproducible frequencies of the
conventional flat drive speaker device.
[0059]
Explanation of sign
[0060]
DESCRIPTION OF SYMBOLS 10 plane diaphragm 10a coupling part 10b support edge part 11
drive unit 12 magnet 13 yoke pole 14 plate 15 voice coil part 16 support member 17 drive unit
18 drive unit 19 cover ring 20 support member 21 frame 22 leg 23 attachment bracket 23a
Mounting hole 23b Wall mounting hole
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