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JPS63102598

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DESCRIPTION JPS63102598
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker for high fidelity playback
indoors and out. From the viewpoint of conventional technology space saving, the demand for
thin speakers has long been. In this regard, conventionally, a rear open type speaker system has
been put into practical use because the internal volume of the thin speaker box can not be
sufficiently obtained and low frequency band reproduction is difficult. However, to mitigate to
some extent the reduction in low-pass sound pressure level due to sound coming from the back
of the diaphragm, the speaker must be placed at a distance of 40 to 60 CT1 or more from the
wall, substantially saving space I can not say. In recent years, however, a speaker system has
been considered in which the peripheral portion of the diaphragm of the speaker is sealed, and
the central portion is open on the rear side and is emitted from a hole provided near the center
of the rear surface of the speaker box. Hereinafter, the above-described conventional speaker will
be described with reference to the entire drawings. FIG. 3 is a view showing the configuration of
a conventional speaker, in which 1 is a diaphragm, 1a is a closed system of the diaphragm 1),
and 1p is a rear open portion of the diaphragm 1. FIG. 2 is an edge, 3 is a speaker box, 4 is an
inner edge which separates the closed space 8 and the open space 9, 5 is an inner partition plate
which also separates the closed space 8 and the open space 9, and 6 drives the moving plate 1
The voice coil, R, is a field portion and is fastened to the middle partition plate 5. In the
conventional speaker configured as described above, the sound radiated from the open space 9
to the rear surface side of the speaker box 3 is radiated from the front surface of the diaphragm
1 if it is sufficiently large even if the speaker box 3 is thin. This produces a large phase difference
to some extent, and the output sound pressure level in the low range can be improved. Further, in
order to make the speaker box 3 thinner, the stroke of the voice coil 6 must be reduced, but the
area of the diaphragm 1 needs to be increased. By forming H <1 <min 1 p and suppressing the
increase of the metamorphic ratio, it is possible to keep the additional mass generated between
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the back surface and the wall surface of the speaker box 3 small, and it is possible to prevent the
decrease in efficiency. Problems to be Solved by the Invention However, in the configuration as
described above, since the stiffness of the closed portion of the diaphragm 1 and the stiffness of
the open portion are largely different, piston motion below the split resonance frequency of the
diaphragm 1 during low range reproduction. Despite being a band, the amplitude of the open
portion in the central portion is dog-like compared to the sealed portion of the diaphragm, and
the diaphragm 1 vibrates in a bent state.
For this reason, at the time of large input, there is a danger that the stroke of the voice coil 6 is
not sufficient and may cause bottom contact. SUMMARY OF THE INVENTION In view of the
above-described problems, the present invention provides a speaker which can sufficiently
withstand high-power reproduction by setting the vibration of the diaphragm to a good piston
velocity even when the stroke of the voice coil is small with a thin type speaker. Means for
Solving the Problems In order to achieve the above object, the present invention is configured to
arrange at least one or more voice coils respectively in the closed portion and the open portion of
the diaphragm to drive at multiple points. In addition, the driving force at each of the seven
driving points is completely weighted, or the number of voice coils disposed in the sealing
portion and the opening portion, or the sealing portion area and the opening portion area of the
diaphragm are different, Work on the area carefully! The driving force per unit area works well
in the sealed 7446 minutes rather than the driving force. According to the present invention,
according to the above-described configuration, the open part and the sealed part are virtually
separated by supplying one pivot power corresponding to the stiffness of the open part and the
closed part of the diaphragm at the time of low range reproduction. The expansion widths of
both diaphragms can be made to the same extent even as two independent diaphragms. As a
result, it is possible to prevent a flexural vibration in which the central portion of the diaphragm
is largely oscillated, and a large output can be reproduced. Embodiments of the present invention
will be described hereinafter with reference to the drawings. FIG. 1 is a view showing a speaker
according to an embodiment of the present invention. Speaker box 3 ° within edge 4. Inner
partition plate5. Enclosed space 8. The open space 9 is the same as in FIG. 1C is a portion
constituting the closed system of the diaphragm 1, 1p is an open portion constituting the open
system of the diaphragm 1, and in the present embodiment, the diaphragm area of the portion
constituting both systems is substantially equalized. . A driver unit 1 o is attached to the open
portion 1 p of the diaphragm 1, and 11 and 12 are driver units attached to the closed portion 1 C
of the diaphragm 1. In the present embodiment, the frame of the speaker is omitted in order to
avoid the complexity of the figure. In the above embodiment, one drive point is provided in the
open portion 1p of the diaphragm 1, and two drive points are provided in the closed portion 1c.
And since the areas of the closed portion 1C of the diaphragm 1 and the open portion 1p are
almost equal, the driving force of unit area per area of the diaphragm 1 is approximately twice as
large as that of the open part 1p. It has become. For this reason, at the time of low-range
reproduction, the piston motion is favorably realized although the closed portion 1C of the
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diaphragm inherently has a smaller vibration amplitude compared to the open portion 1p due to
the large stiffness caused by the closed space 8. can do.
Next, another embodiment of the present invention will be described with reference to the
drawings. FIG. 2 is a view showing another embodiment of the present invention, and different
from FIG. 1 is that two driver units 102L and 10bQ for funding are provided in the open portion
1p of the diaphragm 1. Although the areas of the open portion 1p and the closed portion 1C of
the diaphragm 1 are substantially equal, in this embodiment, good piston motion of the
diaphragm 1 can be obtained by weighting the driving force of the driver units 10 & 10b. It has
been realized. That is, the open portion 1p of the diaphragm 1 is opened at the time of low-range
reproduction by taking the entire driving force of the closed portion 1c i and the driven driver
unit 11 + 12 in comparison with the driven driver units 102L and 10b. It is possible to realize
piston motion with substantially the same level as the vibration amplitude of both the diaphragm
1 and I) <IC and 1p by canceling the difference of the stiffness of the portion 1p and the seal
1T1C. The number of driver units 10 is adjusted in FIG. 1 in order to make the driving force per
unit area of the closed portion and the open portion of the diaphragm different, and in FIG. 2 the
driving of the driver units 10a and 10b is performed. Although the force is weighted, the area
ratio of the open part to the closed part of the diaphragm may be changed if the design
specifications allow. Effect of the Invention The present invention is a direct emission type
speaker in which a part of the same diaphragm constitutes a sealed part and the other part is an
open part, and a plurality of drive points are provided on the diaphragm to drive each By setting
the weight to the force completely or by selecting the arrangement of the drive point, one drive
force per unit area of the sealed part of the diaphragm is made larger than the open part, and it
is good at the time of low range reproduction. It provides an excellent speaker capable of
realizing piston motion imaging.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of the main part showing the configuration of the speaker
according to an embodiment of the present invention, FIG. 2 is a main part cross-sectional view
showing another embodiment of the present invention, and FIG. It is principal part sectional
drawing.
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1--Diaphragm, 1C---Sealed part, 1p---Open part, 2 ...-.. Edge, 3 ...-Speaker box, 4 ...-Inner edge 5,...,
Inner partition plate, 6 ... voice coil, end .. field item, 8 .. enclosed space, 9 .. open space , 10.102
L, 10 b, 11.12 ··· Driver unit.
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1/--страниц
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