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JPS5029132

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DESCRIPTION JPS5029132
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a speaker system, FIG.
2 is a cross-sectional view of a dome speaker, and FIGS. 3 and 4 are modified sides. 5 is a crosssectional view of the horn portion of the back plate. E · E · · · · · · · · · · · · · · · speaker box, 2. · · · · · ·
buckle plate. O-75-real opening 50-29132 (2) one-piece,) m 1-76 one real opening 50-29132 (3)
l l times "] L? −77−
The present invention relates to a loudspeaker apparatus such as a dome loudspeaker, and the
loudspeakers mutually depend on the internal sound pressure in the case (1) generated when
simultaneously reproducing a plurality of loudspeakers having different characteristics in the
same box. Related to those that can prevent the interference of Heretofore, mutual interference
that occurs when multiple speakers with different characteristics are simultaneously reproduced
in the same box, in particular, the internal sound pressure vibration of the low frequency range
speaker acts on the cone and the narrow plate of the middle and high frequency range speaker.
As a prevention method, the back side of each of the middle and high range speakers is
completely sealed in the box, and as another prevention method, the frame of the middle and
high range speakers is opened, and it is There are some which seal a back part by the small box
provided. In the former method, the vibration in the back part is not sufficiently obtained and
amplitude distortion is significantly generated. In the latter method, (2) the vibration space of the
back l1iNs of the middle and high range speaker can be obtained, but it is low. The vibration
space of the range speaker is reduced. And in any case, it has the fault which produces a peak
point in the lower frequency of the horse principal band of the speaker for middle-high range.
The present invention has been made in view of such a point, and the back pressure of the dome
speaker is released from the back to secure a sufficient shooting space at the back, and the
speakers from other parallel speakers are provided. It is an object of the present invention to
provide a speaker device capable of sufficiently taking up the vibration space of the back of the
other speaker 4 only to prevent the interference of the internal sound pressure in the box. One
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embodiment of the present invention will be described with reference to the drawings. In Fig. 1,
(1) is a speaker box, and panel boards (3) and (2) are attached to the front part of this speaker
box fil, and this baffle plate (2) K is a middle high-pitched sound together with a speaker t3 for
low frequency range A dome speaker (4) is provided to cover the area. (5) shown in FIG. 2 is the
yoke of the dome speaker (4). This yoke (5) has a center pole (6) projecting from the center and
an annular magnet (7) fixed to the periphery. Further, a back plate (8) having its edge bent
outward is fixed to the back surface. At the center of the center pole (6), the yoke (5) and the
back plate (8), a closed hole (9) which is expanded at the top of the center pole (6) is bored. Then,
a plate I having an opening (101 is fixedly attached to the upper surface of the annular magnet
(7), and a diaphragm u3 which is semispherically curved forward is attached to the upper surface
of the plate αυ so as to allow vibration. The voice coil Q31 inserted in the opening (IOl) of the
plate αυ is fixed to the plate (the rear surface (4) of the plate L).
The center pole (6) faces inward of the voice coil. Thus, the back plate (8) is provided with a fixed
gap ae via the supporter 051 in the recess 04 formed in the baffle plate (2), and is attached by a
bolt 071 and a nut 1 machine. Therefore, the gap (1e communicates with the center pole f61, the
yoke (5) and the opening (9) of the back plate (8), and the hollow portion (16 ,) Are configured.
With such a configuration, the back pressure of the diaphragm a2 generated by the signal
current flowing through the voice coil (131 is the back plate from the opening (9) of the center
pole (6), the yoke (5) and the back plate (8) It will escape to the gap (161) between (8) and the
baffle plate (2). At this time, since the dome speaker (4) is isolated by the baffle plate (2) by
simultaneously driving the 15) speaker (3) for the low band, the back pressure of the speaker (3)
for the low band is the dome The diaphragm of the speaker (4) does not act on I2. In the present
embodiment, the back plate (8) has been described in which the edge portion is formed to be
bent outward, but as shown in FIG. 6, it may be configured by a flat back plate (El, 2) In this case,
the concave portion fi4) may not be formed in the baffle plate (2). And if the width-of the back
plate (8a) is made larger than the wavelength of the reproduced sound, it is extremely effective
as a baffle plate. Also, a sound absorbing material may be interposed in the gap 0e. Further, as
shown in FIG. 4 and FIG. 5, a plurality of partition plates H are erected in the gap ae, and a
plurality of horns (4) are formed around the opening (9) of the back plate (8a). And 6). This horn
(in the second stage, any shape may be used, but in the case of this embodiment, an exponential
type horn is formed. However, the K of this horn gives directivity to the reproduced sound.
According to the present invention, the back pressure of the diaphragm escapes to the opening of
the center ball, the yoke and the back plate, and the gap between the back plate and the baffle
plate, and the vibration space sufficient for the back portion of the dome speaker in the gap.
Therefore, reproduction noise without amplitude distortion can be generated, and interference of
internal sound pressure in the speaker box from other speakers arranged in parallel can be
prevented. Since it is attached to the outer surface, sufficient vibration 17) space of the rear part
of other speakers arranged in parallel can be secured, and the speaker box can be used
effectively.
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