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DESCRIPTION JP2006020124

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DESCRIPTION JP2006020124
PROBLEM TO BE SOLVED: To provide a speaker capable of achieving thinning and achieving
high input resistance and securing of a reproduction frequency band. SOLUTION: A magnetic
circuit 2 for driving a voice coil 4, a diaphragm 3 to which the voice coil 4 is attached, and a
mounting portion of the voice coil 4 attached to the diaphragm 3 while being attached to the
outside of the magnetic circuit 2. And a plurality of dampers 5 each having a movable portion
attached thereto. Further, the diaphragm 3 has a conical cone portion 3C around the attachment
portion of the voice coil 4, and the movable portion of the damper 5 is attached to the tip portion
of the cone portion 3C. [Selected figure] Figure 2
スピーカ
[0001]
The present invention relates to a thin speaker.
[0002]
In the case of incorporating a speaker into a thinned device, a thin speaker is also required.
In particular, when the device is a flat-screen television using a liquid crystal panel or the like, the
thickness of the flat-screen television also becomes necessarily thin. When incorporating a
speaker into such a thin device, a particularly thin speaker is necessary. Furthermore, in an
apparatus such as a flat-screen television, since the speakers are disposed on both sides of the
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liquid crystal panel, the elongated shape is required as the shape of the speakers. As a speaker
used for such a device, there is one having a plurality of magnetic circuits (Patent Document 1).
Unexamined-Japanese-Patent No. 10-327491
[0003]
There are the following problems in making the conventional speaker thin. In the conventional
speaker, in order to realize high input resistance and secure a reproduction frequency band, the
diaphragm is conically shaped, a voice coil is attached to the bottom of the diaphragm, a damper
is attached to the voice coil, and the damper is vibrated It is a structure provided between the
plate and the magnetic circuit. Due to this structure, that is, a structure having a damper between
the diaphragm and the magnetic circuit, it is difficult to make the speaker thin in order to be
incorporated in a thin device such as a liquid crystal television.
[0004]
Further, in the speaker described in Patent Document 1 mentioned above, since the diaphragm
has a planar shape, it is impossible to secure high input resistance and a reproduction frequency
band.
[0005]
It is an object of the present invention to provide a speaker capable of solving the abovementioned problems and enabling thinning and achieving high input resistance and securing of a
reproduction frequency band.
[0006]
In order to solve the above problems, the invention according to claim 1 is characterized in that a
magnetic circuit for driving a voice coil, a diaphragm to which the voice coil is attached, and the
vibration attached to the outside of the magnetic circuit. It is a speaker characterized by having a
plurality of dampers to which a movable part is attached around the attachment part of the voice
coil to a board.
According to a second aspect of the present invention, in the speaker according to the first
aspect, the diaphragm has a conical cone portion around the attachment portion of the voice coil,
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2
and the distal end portion of the cone portion moves the damper. It is characterized in that each
part is attached.
[0007]
According to the present invention, even in the speaker having one magnetic circuit, when the
damper is provided outside the magnetic circuit and the damper is attached to the diaphragm,
the movable portion of the damper around the voice coil attachment portion Can be made thin,
and yet sufficient amplitude can be secured.
Further, according to the present invention, a conical cone portion is formed around the voice
coil attachment portion, and the movable portion of the damper is attached to the tip portion of
the cone portion, so that the overall height of the diaphragm is increased. It is possible to realize
high input resistance and securement of the reproduction frequency band.
[0008]
Next, the best mode for carrying out the present invention will be described with reference to the
drawings. FIG. 1 is a plan view showing a speaker according to the present embodiment, and FIG.
2 is a cross-sectional view showing an I-I cross section of FIG. 3 is a cross-sectional view showing
the II-II cross section of FIG. 1, and FIG. 4 is a cross-sectional view showing the III-III cross
section of FIG. The speaker is composed of a frame 1, a magnetic circuit 2, a diaphragm 3, a voice
coil 4, a damper 5, and a terminal portion 6.
[0009]
The frame 1 has an elongated shape. The frame 1 is provided with a recess having a first opening
1A in the form of a track. At the center of the bottom of the recess, a second opening 1B having a
circular shape and a third opening 1C having a circular shape sandwiching the second opening
1B are opened along the longitudinal direction of the frame 1 . Note that 1D in FIG. 1 is a
mounting hole for mounting a speaker.
[0010]
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A magnetic circuit 2 is attached to the second opening 1 B of the frame 1. The magnetic circuit 2
includes a cylindrical yoke 2A, and includes a magnet 2B and a plate 2C around the yoke 2A.
That is, the magnet 2B is fixed to the flange portion 2A1 of the yoke 2A, and the plate 2C is fixed
to the magnet 2B. The plate 2C is fixed to the peripheral portion of the second opening 1B of the
frame 1. A gap is formed between the plate 2C and the yoke 2A.
[0011]
A diaphragm 3 is attached to the first opening 1A of the frame 1. That is, the edge portion of the
support 3A of the diaphragm 3 is attached to the edge portion of the first opening 1A. In a
central portion of the diaphragm 3, a circular first mounting hole 3B is opened. The cylindrical
bobbin 4A of the voice coil 4 is fixed to the first mounting hole 3B, and the coil portion 4B of the
voice coil 4 is inserted into the aforementioned gap of the magnetic circuit 2. The end of the
bobbin 4A located on the diaphragm 3 side is closed by a cap 4C. The voice coil 4 is driven by
the magnetic circuit 2 to vibrate the diaphragm 3. Conical cone portions 3C are respectively
formed in the longitudinal direction of the frame 1 with the first attachment holes 3B of the
diaphragm 3 interposed therebetween. A circular second mounting hole 3D is formed in a
portion located at the tip of the cone portion 3C. In the present embodiment, the magnetic circuit
2 is disposed on the rear surface side of the diaphragm 3, and the diaphragm 3 has a structure
having two cone portions 3C. That is, since the two cone portions 3C having a conical shape are
provided on the diaphragm 3, the overall height of the diaphragm 3 is increased.
[0012]
Disk-like dampers 5 are attached to the second attachment holes 3D of the diaphragm 3,
respectively. The outer peripheral edge of the damper 5 is fixed to the peripheral edge of the
third opening 1 C of the frame 1. At a central portion of the damper 5, a cylindrical convex
portion 5A is formed. A portion between the outer peripheral edge of the damper 5 and the
convex portion 5A is processed in a concavo-convex shape. The convex portion 5A of the damper
5 is attached to the second attachment hole 3D of the diaphragm 3 as described above. In the
present embodiment, two dampers 5 are disposed outside the magnetic circuit 2, and further, the
movable portion of the damper 5 is fixed to the tip portion of the cone portion 3C of the
diaphragm 3. That is, the damper 5 is not directly attached to the bobbin 4 A of the voice coil 4,
and the damper 5 restricts the movement of the cone portion 3 C of the voice coil 4 so that the
coil portion 4 B of the voice coil 4 is of the magnetic circuit 2. It is intended to be positioned
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4
precisely in the gap.
[0013]
The frame 1 has a plate-like bent portion 1E, and the terminal 6A of the terminal portion 6 is
attached to the bent portion 1E. The lead wire 6B of the terminal portion 6 electrically connects
the terminal 6A to the coil portion 4B of the voice coil 4. One end of the lead wire 6B is inserted
into the terminal 6A and connected, and the other end is a diaphragm It is being fixed to convex
part 5A of three. The other end of the lead wire 6B is connected to the lead wire from the coil
portion 4B of the voice coil 4 via the diaphragm 3.
[0014]
The speaker according to the present embodiment has the above-described configuration.
According to this configuration, since the damper is not attached to the bobbin of the voice coil
as in the prior art, it is not necessary to take a vibration space under the damper 5, and the
speaker can be made thin.
[0015]
Further, according to this configuration, since the two dampers 5 are provided outside the
magnetic circuit 2, the thickness of the magnetic circuit 2 can be used as a space in which the
damper 5 vibrates, and the speaker can be made thin. Can.
[0016]
Furthermore, according to this configuration, by providing the two cones 3C on the diaphragm 3
to increase the overall height of the diaphragm 3, it is possible to obtain shape rigidity and
realize high input resistance. , The reproduction frequency band can be secured.
[0017]
As mentioned above, although the embodiment of the present invention has been described in
detail, the specific configuration is not limited to the present embodiment, and even if there is a
design change or the like within the scope of the present invention. included.
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[0018]
FIG. 1 is a plan view of a loudspeaker according to an embodiment of the present invention.
It is sectional drawing which shows the I-I cross section of FIG.
It is sectional drawing which shows the II-II cross section of FIG.
It is sectional drawing which shows the III-III cross section of FIG.
Explanation of sign
[0019]
DESCRIPTION OF SYMBOLS 1 frame 1A 1st opening 1B 2nd opening 1C 3rd opening 1D
attachment hole 1E bending part 2 magnetic circuit 2A yoke 2A1 flange part 2B magnet 2C plate
3 diaphragm 3A supporting material 3B 1st attachment hole 3C cone Part 3D Second mounting
hole 4 Voice coil 4A Bobbin 4B Coil part 4C Cap 5 Damper 5A Convex part 6 Terminal part 6A
Terminal 6B Lead wire
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