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DESCRIPTION JPH0528198

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DESCRIPTION JPH0528198
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
thin dome type speaker mainly used for vehicles, which is easily stored and attached by a
structure having a reduced height.
[0002]
2. Description of the Related Art As shown in the cross-sectional view of FIG. 5 and the plan view
of FIG. 6, 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
adheres to a frame (07) by (03e), and it presses and supports between the packing (05) with the
inner edge edge of an outer frame (01) from the upper part. 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 such as cotton (09b) in a cover (09) covering the rear face of the
magnetic circuit (04) in communication with
[0003]
Therefore, with 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 its resonance to
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the sound absorbing material (03b) of the space (03a), And the sound absorbing material (09b)
in the space (09a) occupying the inside of the cover (09) is suppressed, absorbed, and reduced,
so that peaks and dips due to vibration resonance are eliminated, and the reproduction sound
quality of the speaker is favorably affected. Exerts
[0004]
However, in the conventional dome-shaped speaker of such a structure, a considerable 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 (oh) must be increased by the use of
a thin magnet with a large coercive force such as a neodymium magnet. Also, the height (oh) of
the entire speaker is bulky, and there is a problem that it is difficult to handle as an on-vehicle
speaker for storage and mounting.
[0005]
Therefore, in the present invention, the space (07a) outside the frame (07), which has not been
considered as a dead space conventionally, in order to solve the problems of the conventional
dome-shaped speaker with such a structure. To reduce the height of the cover and maintain a
thin space of a small thickness on the lower surface of the lower plate (04d) of the magnetic
circuit (04), and the outer frame (01) and The space (07a) is expanded outward to the outer
periphery of the frame (07), and the space (03a) inside the diaphragm (03) via the inside of the
diaphragm (03) and the magnetic gap (04a) And a space (07a) between the frame (07) and the
cover in communication with each other to enlarge and secure the space (03a).
And if necessary, a sound absorbing material (07b) may be packed and held in the rear surface of
the lower plate (04d) of the magnetic circuit (04) and the rear space (07a).
With the above configuration, it is not necessary to pack the sound absorbing material (09b) in
the high height cover (09) of the back surface of the conventional magnetic circuit (04), and the
speaker is thinly configured, and energy of vibration resonance is absorbed. This is a thin domeshaped speaker aiming to improve the reproduction sound quality of the speaker.
[0006]
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SUMMARY OF THE INVENTION The construction of the first invention for achieving the object
will be described with reference to FIGS. 1 and 2 corresponding to the embodiment, in which a
central hole (4c) is formed. The outer wall of the cover (9) which holds and covers the lower
surface side of the magnetic circuit (4) and a small space, is expanded outward to the outer
periphery of the outer frame (1) and the lower outer side of the frame (7) In the speaker in which
the space (7a) is formed, a thin space (7c) of thickness is held between the lower surface of the
lower plate (4d) of the magnetic circuit (4), and the inner space (3a) of the diaphragm (3) )
Through a central hole (4c) and communicating with the space (7a) between the frame (7) and
the cover (9), thereby expanding the space (3a) and securing the thin dome-shaped speaker is
there. And if necessary, the sound absorbing material (7b) is packed and held in the space (7c) on
the rear surface of the lower plate (4d) of the magnetic circuit (4) and the space (7a).
[0007]
The second aspect of the present invention is a cover (9) which covers the lower surface side of
the magnetic circuit (4) in which the central hole (4c) is bored in the cross-sectional view of FIG.
3 and the plan view of FIG. In a speaker in which the outer wall is expanded outward to the outer
periphery of the outer frame (1) to form the lower outer space (7a) of the frame (7), the lower
surface of the lower plate (4d) of the magnetic circuit (4) A thin dome-shaped speaker having a
structure in which the inner space (3a) of the diaphragm (3) is communicated with the space (7a)
of the frame (7) by the slit (4e) communicating with the drilled central hole (4c) It is. And if
necessary, the sound absorbing material (7b) is packed and held in the slit (4e) on the rear
surface of the lower plate (4d) of the magnetic circuit (4) and the space (7a).
[0008]
[Operation] Since the first and second aspects of the invention have such a structure, a magnetic
circuit can be provided through the inner space (3a) of the dome-shaped diaphragm (3) through
the central air vent hole (4c). (4) The space (7c) formed on the lower surface of the lower plate
(4d) or the space (7a) formed between the frame and the outer periphery of the frame (7) can be
mutually expanded via communication . And resonance energy can be absorbed by the sound
absorbing materials (3b) and (7b).
[0009]
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Embodiments of the present invention will be described with reference to the drawings. In the
drawings, FIG. 1 and FIG. 2 show an embodiment of the first invention, and FIG. 1 shows its
sectional view and FIG. 2 shows a plan view. That is, (4) is an internal magnetic type magnetic
circuit having a central hole (4c) in which a neodym permanent magnet (2) is incorporated, for
example, by the center pole (4b) and the magnetic plate portion (7d) of the frame (7). A voice coil
(8) attached to the tip of a tome-shaped diaphragm (3) is suspended in an annular magnetic gap
(4a) to be formed, and a frame is formed by an edge (3e) formed at the outer edge of the
diaphragm (3). It adheres to (7) via packing (5), and it presses and supports with the inner edge
edge of outer frame (1) from the top.
[0010]
The cover (9) covering the outside of the magnetic circuit (4) is held with a space (7c) of a small
thickness between the cover (9) and the lower surface of the lower plate (4d) of the magnetic
circuit (4). Arranging and expanding outward to the outer periphery of the outer frame (1) to
form the lower outer space (7a) of the frame (7), and the inner space (3a) of the diaphragm (3) 7)
A thin dome-shaped speaker configured to communicate with a space (7a) between a cover (9)
and the space (3a) to be extended. And if necessary, the sound absorbing material (7b) is packed
and held in the aforementioned spaces (7a) and (7c). With such a configuration, the space (3a)
inside the diaphragm (3) can be removed from the space (7c) on the lower surface of the lower
magnetic plate (4d), the frame (7) and the cover 9) is expanded and communicated with the
space (7a) between
[0011]
In the second invention, in the sectional view of FIG. 3 and the plan view of FIG. 4, (4) is, for
example, an inner magnetic type magnetic circuit having a central hole (4c) in which a neodym
permanent magnet (2) is incorporated. A voice coil (8) attached to the tip of the dome-shaped
diaphragm (3) in an annular magnetic gap (4a) formed by the center pole (4b) and the magnetic
plate portion (7d) of the frame (7) Suspend and attach to the frame (7) with the edge (3e) formed
on the outer edge of the diaphragm (3) through the packing (5), and press it from above with the
inner edge of the outer frame (1) to support it doing.
[0012]
A cover (9) covering the outer side of the magnetic circuit (4) is disposed in close contact with
the lower surface of the lower plate (4d) of the magnetic circuit (4), and to the outer periphery of
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the outer frame (1). A slit (4e) which is expanded outward to form a lower outer space (7a) of the
frame (7) and which communicates with a central hole (4c) drilled in the lower surface of the
lower plate (4d) of the magnetic circuit (4) The thin space is constructed by communicating the
inner space (3a) of the diaphragm (3) with the space (7a) between the frame (7) and the cover (9)
to expand the space (3a) It is a shape dome shaped speaker.
If necessary, the sound absorbing material (7b) is packed and held in the space (7a) and the slit
(4e). With such a configuration, the space (3a) inside the diaphragm (3) passes through the air
vent hole (4c), the slit (4e) on the lower surface of the lower magnetic plate (4d), and the frame
(7) and the cover Extend to the space (7a) between
[0013]
It is also possible to omit the packing (5) by sticking the upper surface of the diaphragm (3) of
the first and second inventions to the lower surface of the inner edge portion of the outer frame
(1).
[0014]
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-described 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.
[0015]
[Effects of the Invention] As is apparent from the above description, the first and second
inventions are constructed in this way, so the height of the cover (9) is low. By adopting a
neodym magnet as a permanent magnet, the overall height (h) of the speaker can be lowered,
and it can be easily stored and mounted in a thin place such as a car door, and it is convenient
for handling. The space between the lower plate (4d) and the cover (9) can be utilized as well as
the effect that space can be utilized without requiring a volume in the inventory and the inner
space (3a) inside the dome-shaped diaphragm (3) 7c), or through slits (4e), in communication
with the space (7a) formed between the outer lower surface of the frame (7) and the cover (9),
which can be expanded to those spaces (3a), The resonance energy of the diaphragm (3) is
absorbed by the sound absorbing materials (3b) and (7b) in the slit (4e) and the slit (4e), and the
reproduced sound quality There is also an effect that can help to improve.
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