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DESCRIPTION JPH0851692

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH0851692
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker suitable for a woofer for cabinetless television, a subwoofer for radio cassette, a
subwoofer for home, a subwoofer for car and the like.
[0002]
2. Description of the Related Art As shown in FIG. 3, a general speaker system uses a woofer, a
squawker, a tweeter, etc., and although the frequency characteristic of the system is not shown, a
network circuit etc. is used. To correct the frequency characteristics. In contrast, as shown in FIG.
4, the subwoofer of the present invention is intended to compensate or enhance the bass of a full
range speaker, and enables a broadband speaker system without using a network circuit. .
[0003]
FIG. 5 shows a conventional speaker provided with a mechanical filter. The conventional speaker
shown in FIG. 5 is provided on an inverted T-shaped yoke 1 having a flange 1a and a center pole
1b, a ring-shaped magnet 2 fixed on the flange 1a thereof, and the magnet 2 Plate 3 and the
frame 4 with the bottom fixed on the plate 3, the diaphragm 5 connected to the outer peripheral
portion of the frame 4 via the edge 5a, and the two steps at an interval in the axial direction of
the frame 4 First and second dampers 6 and 7 disposed on the inner periphery of the frame 4, a
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mechanical filter 8 provided on the inner periphery of the diaphragm 5, and the center pole 1 b
of the yoke 1. A voice coil 9 disposed in a magnetic gap formed between the magnet 2 and the
plate 3 and supporting the voice coil 9 and by the first, second dampers 6, 7 and the mechanical
filter 8 And it is configured to include a voice coil bobbin 10 which is oscillatably supported, and
a cap 11 which is covered on the upper surface of the central portion of the diaphragm 5 Te.
[0004]
However, when the conventional speaker is attached to the baffle plate and the voice coil bobbin
10 is disposed in the lateral direction, the diaphragm 5 and the voice coil bobbin 10 are bent by
the weight of the diaphragm 5. The gap between the voice coil bobbin 10 and the center pole 1b
is biased, and the gap width in the circumferential direction is not constant. When the speaker is
driven in this state, rolling occurs due to the deviation between the center of gravity and the
support point, and the voice coil bobbin 10 and the center pole 1b contact in a narrow gap
portion, causing a problem of distortion or abnormal noise.
[0005]
In order to solve this problem, a structure in which a damper is interposed between the cone
neck and the frame has been proposed. Although the speaker of this structure is effective for
releasing the contact at the gap portion, it has not been able to reduce the reaction to the voice
coil due to the divided vibration mode and the reflection from the edge occurring in the cone
paper.
[0006]
The present invention has been made in view of the above circumstances, and the object of the
present invention is to reduce rolling due to the deviation between the center of gravity when
driving the speaker and the support point, and further, the divided vibration. Loudspeaker that
reduces the mode and reduces reflection from the edge of the diaphragm, reduces distortion of
the voice coil, and when used in combination with a full range speaker, enables a broadband
speaker system without using a network circuit Is to provide.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, a mechanical filter 12 is provided on the upper portion of a voice coil bobbin 10, and
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the mechanical filter 12 and the diaphragm 13 have central axes O-. It is what was couple |
bonded by one point 14 on O. FIG.
[0008]
Further, in order to achieve the above object, the present invention is one in which the single
plate damper 15 and the diaphragm 16 are joined at one point 17 on the central axis OO.
[0009]
In the present invention, the mechanical filter 12 is provided on the upper portion of the voice
coil bobbin 10, and the mechanical filter 12 and the diaphragm 13 are joined at one point 14 on
the central axis OO. The influence on the voice coil can be minimized, and by placing the point of
action of the weight of the diaphragm 13 and the suspension fixing point on the same line, the
deviation between the center of gravity and the supporting point when the speaker is driven. Can
reduce rolling.
Moreover, since the diaphragm 13 (cone paper) can be formed in a complete conical shape, the
strength is increased compared to the diaphragm (cone paper) of a conventional speaker that
needs to have a hole of a large voice coil diameter at the center. The split vibration mode can be
reduced, and the reflection from the edge 13a can be reduced to reduce distortion of the voice
coil.
[0010]
Further, in the present invention, the upper end portion of the voice coil bobbin 10 is supported
by the damper 15 of one plate, and the damper 15 of the one plate and the diaphragm 16 are
arranged at one point 17 on the central axis O-O. It is connected.
As a result, also in the present invention, the rolling action due to the deviation between the
center of gravity when driving the speaker and the support point can be reduced by the same
action as that described above, and the divided vibration mode is reduced. The reflection from
the 16 edges 16a can be reduced to reduce distortion of the voice coil.
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[0011]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention. In the
first embodiment shown in FIG. 1, a mechanical filter 12 is provided on the top of the voice coil
bobbin 10. On the other hand, the diaphragm 13 is attached to the frame 4 via the edge 13a, and
the diaphragm 13 is formed in a complete conical shape. The mechanical filter 12 and the
diaphragm 13 are joined at one point 14 by bonding or the like on the central axis OO. The other
configuration of the first embodiment is the same as that of the loudspeaker described with
reference to FIG.
[0012]
In the loudspeaker of the first embodiment configured as described above, the mechanical filter
12 and the diaphragm 13 are joined at one point 14 on the central axis O-O, and the action point
of the weight and the suspension fixing point are the same. Since it is installed on the line, it is
possible to reduce the rolling due to the deviation between the center of gravity and the support
point when the speaker is driven.
[0013]
Also, as can be seen from FIG. 1, the shape of the diaphragm (corn paper) 13 can be formed in a
complete conical shape without a hole in the center, a hole with a large voice coil diameter in the
center of the diaphragm. Since it is possible to increase the strength as compared with the
conventional cone paper (see the diaphragm 5 in FIG. 4) which needs to be illuminated, the
divided vibration mode can be reduced and the reflection from the edge 13a can be reduced.
Thus, the distortion of the voice coil 9 can be reduced.
[0014]
Next, FIG. 2 is a longitudinal sectional view showing a second embodiment of the present
invention.
In the second embodiment shown in FIG. 2, a single plate damper 15 is provided instead of the
second damper 7 and the mechanical filter 12 of the first embodiment, and the voice coil bobbin
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10 is mounted on the single plate damper 15. The upper end of the is supported.
Further, the diaphragm 16 is attached to the frame 4 via the edge 16 a. The single-plate damper
15 and the diaphragm 16 are joined at one point 17 on the central axis OO by adhesion or the
like.
[0015]
The other structure of the second embodiment is the same as that of the first embodiment.
[0016]
Also in the speaker of the second embodiment configured as described above, since the point of
action of the weight and the suspension fixing point can be placed on the same line, the deviation
between the center of gravity and the supporting point when the speaker is driven Can reduce
rolling.
[0017]
Moreover, since the diaphragm (cone paper) 16 can be formed into a complete conical shape, the
strength can be increased, the divided vibration mode can be reduced, and the reflection from the
edge 16a can be reduced, etc. Distortion of the voice coil 9 can be reduced.
Thus, in the subwoofer of the present invention, as shown in FIG. 4, in combination with a full
range speaker, a wide band can be reproduced without using a network circuit.
[0018]
As described above, in the invention according to claim 1 of the present invention, the
mechanical filter is provided on the upper portion in the voice coil, and the mechanical filter and
the diaphragm are arranged on the central axis in one. The points are connected and the point of
action of the weight and the suspension fixing point can be placed on the same line, which has
the effect of reducing the rolling due to the deviation between the center of gravity and the
support point when the speaker is driven, Since the diaphragm can be formed in a complete
conical shape, the strength can be increased, the divided vibration mode can be reduced, and the
reflection from the edge can be reduced, which also has the effect of reducing the distortion of
the voice coil.
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[0019]
Further, in the invention according to the second aspect of the present invention, the upper end
portion of the voice coil bobbin is supported by the one-plate damper, and the one-plate damper
and the diaphragm are arranged at one point on the central axis. In the present invention, the
action point of the weight and the suspension fixing point can be placed on the same line, so that
the rolling due to the deviation between the center of gravity and the supporting point when the
speaker is driven can be reduced. In addition, since the diaphragm can be formed in a perfect
conical shape, the strength can be increased, the divided vibration mode can be reduced, and the
reflection from the edge can be reduced, so that the distortion of the voice coil can be reduced.
There is also.
[0020]
Brief description of the drawings
[0021]
1 is a longitudinal sectional view showing a first embodiment of the present invention.
[0022]
2 is a longitudinal sectional view showing a second embodiment of the present invention.
[0023]
FIG. 3 is a sound pressure-frequency characteristic diagram of a general subwoofer.
[0024]
Fig. 4 Sound pressure-frequency characteristics of the subwoofer and full range speaker of the
present invention.
[0025]
5 is a longitudinal sectional view showing a conventional speaker provided with a mechanical
filter.
[0026]
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Explanation of sign
[0027]
DESCRIPTION OF SYMBOLS 1 yoke 2 magnet 3 plate 4 frame 6 1st damper 7 2nd damper 9
voice coil 10 voice coil bobbin 12 mechanical filter 13 diaphragm 13a diaphragm edge
attachment for edge OO Speaker central axis 14 coupling mechanical filter and diaphragm One
point 15 as a part One-plate damper 16 Diaphragm 16 a Edge 17 for attaching a diaphragm One
point as a connecting part between one-plate damper and diaphragm
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