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DESCRIPTION JPH04137695

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DESCRIPTION JPH04137695
[0001]
[Industrial field of application] The present invention utilizes the bayonet structure mounting
hole (1a) of the frame (1) to form a space inside the horn (5) and an inside of the diaphragm (3).
The present invention relates to a thin dome-shaped speaker having a communicating structure.
[0002]
2. Description of the Related Art As shown in the cross-sectional view of FIG. 4 and the plan view
of FIG. 5, the structure of a conventional dome-shaped speaker of this type in the prior art is an
internal magnetic type magnet incorporating a permanent magnet (02). An edge formed on the
outer edge of the diaphragm (03) by suspending the voice coil (08) attached to the tip of the
dome-shaped diaphragm (03) in the annular magnetic gap (04a) formed by the circuit (04) It is
stuck to the frame (07) at (03e), and is pressed and supported between the packing (05) at the
inner edge of the horn (01) from above. Thus, the sound absorbing material (03b) is packed in
the space (03a) between the inner surface of the diaphragm (03) and the center pole (04b), and
an air vent hole (04c) drilled at the center of the magnetic circuit (04). A sound absorbing
material (09b) such as cotton is packed in a cover (09) that covers the rear surface of the
magnetic circuit (04), which communicates with each other.
[0003]
Therefore, according to such a configuration, the standing wave vibration of the diaphragm (03)
generated by the vibration of the diaphragm (03) is controlled by the energy of the resonance to
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the sound absorbing material (03b) of the space (03a), Because the sound absorption material
(09b) in the space that occupies the inside of the cover (09) is suppressed, absorbed and
reduced, the peaks and dips due to vibration resonance are eliminated and the bass sound
reproduction of the speaker is favorably affected.
[0004]
However, in the conventional dome-shaped speaker having such a structure, a considerably large
space and a large volume of sound absorbing material (03b), (09b) are necessary. For that
purpose, in order to increase the internal volume of the cover (09), the height (0 h) must be
increased by the use of a thin magnet with a large coercivity such as a neodymium magnet. Also,
the height (0 h) of the entire speaker is bulky, and there is a problem that it is difficult to handle,
for example, a car-mounted speaker etc. for storage and mounting.
[0005]
Therefore, in order to solve the problems of the conventional dome-shaped speaker having such
a structure, the present invention has a space inside the horn (05) which has not been considered
as a dead space conventionally. The bayonet hole (1a) of the frame (1) is communicated with the
inside of the diaphragm (03) and the magnetic gap (04a) to form the space (03a) inside the
diaphragm (03). By making the shape of the speaker thin and absorb the energy of the vibration
resonance, the reproduction sound quality of the speaker, and the like. In particular, it is a domeshaped speaker for the purpose of improving the reproduction of the bass range.
[0006]
The configuration of the present invention for achieving the object will be described with
reference to FIGS. 1 to 3 corresponding to the embodiments. The outer periphery of the roll edge
(3b) is attached to the lower surface (1c) of the inner peripheral part of the frame (1), and the
bayonet type attachment structure drilled in the frame (1) is used. A dome-shaped speaker in
which a space (1a) bored inside the horn (5) bonded to the upper surface of (1) and the inside of
the diaphragm (3) are communicated via a magnetic gap (4a).
[0007]
Since the present invention has such a structure, the inner space of the dome-shaped diaphragm
is inserted into the frame (1) through the mounting hole (1a) of the bayonet type mounting
structure. It can be expanded in communication with the space drilled inside the horn (5).
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As a result, the overall height (h) of the speaker can be lowered, and it is not only convenient for
storing, mounting and handling, but it absorbs the resonance energy due to vibration and
improves the reproduction sound quality, particularly the reproduction of the bass region. Can be
[0008]
Embodiments of the present invention will be described with reference to the drawings.
1 and 2 are views showing one embodiment of the present invention, and FIG. 1 is a crosssectional view thereof, FIG. 2 is a plan view of a frame (1), and FIG. 3 is a yoke (4). Shows a plan
view of the
That is, (4) is a yoke of an internal magnetic type magnetic circuit incorporating a permanent
magnet (2), and a dome-shaped diaphragm in an annular magnetic gap (4a) formed by a center
pole (4d) and a magnetic plate portion. Suspend the voice coil (8) attached to the tip of (3), and
paste the outer periphery of the roll edge (3b) formed at the outer edge of the diaphragm (3) to
the lower surface (1c) of the inner periphery of the frame (1) Then, it is fitted to the outer edge
(4b) of the yoke (4) by a step (1d) provided at the outer edge of the frame (1).
At that time, the concave portion (4c) provided in the outer edge portion (4b) of the yoke (4) is
fitted in the bayonet hole portion (1a) of the frame (1) and the claw (1b) provided inward
projecting therefrom. By inserting and fitting to and rotating, the claw (1b) is locked to the outer
edge (4b), and the yoke (4) is detachably engaged with the frame (1) in a bayonet manner.
[0009]
Thus, the inner space (5a) of the horn (5) is passed through the bayonet part hole (1a), and the
magnetic air gap (4a) below the edge (3b) of the diaphragm (3), The space (3c) between the inner
surface of the diaphragm (3) and the center pole (4d) is in communication. And if necessary, a
sound absorbing material (5b) is packed in those spaces (1a) and (3c). The frame (1) and the
yoke (4) are fitted by fitting to the outer edge of the yoke (4) by a step (1d) provided at the lower
edge of the frame (1). Thus, the center pole (4d), the permanent magnet (2) and the plate of the
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magnetic circuit have a structure that does not need to have an air vent hole in the center.
However, although it is possible to expand the reproduction frequency range by communicating
with the outside as a sound path by drilling air vents and packing the sound absorbing material
according to design requirements, there is no change in external dimensions, and reproduction
sound quality, in particular It is possible to further improve the reproduction of the low range.
The rear lid (6) is concentrically bonded to the frame (1) and closely attached to the outer
diameter of the yoke (4).
[0010]
Although the embodiments considered to be representative of the present invention have been
described above, the present invention is not necessarily limited to only the structure of these
embodiments, and includes the above-mentioned components according to the present invention,
and In order to achieve the purpose of the present invention, the present invention can be
appropriately modified and implemented within the scope having the following effects.
[0011]
As is apparent from the above description, since the present invention has such a structure, the
internal space inside the dome-shaped diaphragm is drilled inside the horn. It can be expanded in
communication with the
As a result, the center hole of the conventional center pole (4d) is also unnecessary, so that the
processing cost is unnecessary, the cost can be reduced, the cover at the rear of the speaker is
not necessary, and the overall height (h) of the speaker can be reduced It can be easily stored
and installed in thin places such as car doors, and it is not only convenient for handling, it can
take advantage of space without requiring a large amount of inventory, and its reproduction
sound quality, especially low range reproduction It is possible to expect a remarkable effect in
practical use that can improve the The present invention also has the effect of making the overall
height (h) even lower by using a magnet with a large coercivity such as a neodymium magnet.
[0012]
Brief description of the drawings
[0013]
1 is a longitudinal cross-sectional view of an embodiment speaker of the present invention.
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[0014]
2 is a plan view of the frame.
[0015]
3 is a plan view of the yoke.
[0016]
4 is a longitudinal sectional view of a conventional example.
[0017]
5 is a plan view of a conventional example.
[0018]
Explanation of sign
[0019]
(1) Frame (1a) Bayonet mounting hole (1c) Frame lower surface (1d) Step (2) Permanent magnet
(3) Diaphragm (3b) Corrugation edge (4) Yoke (4a) Magnetic gap (5) Horn (5a) Horn space
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