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DESCRIPTION JPS5224925

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DESCRIPTION JPS5224925
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a television receiver in one
embodiment of the present invention, FIG. 2 is a perspective view of parts used in the same
receiver, and FIG. 3 is the same receiver. It is a fragmentary enlarged side view of FIG. 1 ......
cabinet, 2,3 ...... leg, 5 ...... supporting device, 10 ...... legs. Fig. 1-49. One open plate 4724925 (2)
Fig. 3 50-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a back load horn
type speaker capable of obtaining high efficiency and uniform sound pressure response in the
bass region and having variable directivity in the treble region. As known in the prior art, as
shown in FIG. 1, the back load horn type speaker 0 has a horn 4 whose one end of the acoustic
path 3 is coupled to the back surface 2B side of the cone 2 of the direct radiation speaker It
comprises an acoustic capacity for converting the output from the horn 4 on the side of the open
surface 2A of the cone 2 of the speaker 1 for the reproduction of the area and the treble area.
Further, in the back load horn type speaker 10 as described above, the mechanical reactance of
the compliance CM in the space on the back surface 2B side of the cone 2 of the speaker 1 is
large compared to the mechanical impedance ZM of the throat of the horn 4 in the bass region. It
has become. Thus, in the bass region, the cone 2 of the speaker 1 is directly coupled to the sound
passage 3 of the horn 4 so that the reproduced sound from the speaker 1 is radiated to the
outside through the sound passage 3 of the horn 4 from the opening 5 It has become. Also, when
the frequency of the reproduced sound from the speaker 1 increases and the mechanical
reactance of the compliance CIII becomes smaller than the mechanical impedance ZM of the
throat of the horn 4, the sound pressure response from the horn 4 is attenuated. Since most of
the reproduced sound is radiated to the outside from the front surface 2A side of the cone 2 of
the speaker 1, the back load horn type speaker 10 operates as a direct radiation speaker in the
middle sound area and the high sound area. Therefore, the sound pressure response vs.
frequency characteristics of the pack load horn type speaker 10 are shown as in FIG. 2, and high
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efficiency and uniform sound pressure response can be obtained in the bass region, so that they
have been used conventionally. . In FIG. 2, a portion where the operation by the horn 4 and the
operation as the direct radiation speaker are superimposed is shown by a broken line and a
dashed dotted line. Also, if the speakers are placed close to the acoustically reflective wall, as
with the mirrors in light, as if both the position of the actual speaker and the position of the
image of the speaker with the reflecting wall as the mirror, the sound It is well known in the prior
art that the effect is as if emitted. Therefore, when the speaker 20 is installed on the acoustically
reflective floor 21 and in proximity to the acoustically reflective side wall 22 as shown in FIG. As
shown by the n = 4 curve of the directivity frequency characteristics of the n linear array
speakers shown in FIG. 4, the sound pressure increases by a factor of 4 (1271 B) in the bass
region.
Therefore, in order to obtain sufficient sound pressure in the reproduction of the bass region, as
shown by the solid line in FIG. 5, the speakers are disposed at both corners of the room.
However, in order to obtain the sound pressure increase in the bass region by utilizing the effect
of the above-described speaker image, the front surfaces 30a and 31a of the left and right
speakers 30.31 in FIG. In the case of installation with the angle of, the range of the listening
point (that is, the position where the reproduced sound of both the left and right speakers 30, 31
can be sufficiently listened) is indicated by the directivity of the speakers as shown by oblique
lines in FIG. It becomes very narrow. When the front surfaces of the left and right speakers 30
'and 31' are installed at an angle smaller than 1800, as indicated by a broken line in FIG. 5, in
order to widen the range of the listening point, The effect by the image 4-that is, the high
pressure rise can not be obtained. Therefore, the present invention has been devised to solve the
above-mentioned drawbacks, and a novel back load horn type speaker capable of obtaining a
sufficiently wide range of listening points, ie, a speaker is incorporated. The speaker unit portion
is movably mounted on a horn portion having an acoustic passage of desired frequency
characteristics, and one end of the acoustic passage of the horn portion is open and the other
end is the back surface of the speaker of the speaker unit portion It is an object of the present
invention to provide a back load horn loudspeaker characterized in that it is acoustically coupled
to the side. Hereinafter, the present invention will be described in detail according to the example
of FIGS. 6 and 7 showing one embodiment. An acoustic passage 42 having a partition plate 41
appropriately provided so as to have a desired frequency characteristic is formed inside the horn
portion 40, and one end of the acoustic passage 42 is an opening provided in the horn portion
40. The other end is in communication with the cylindrical cylindrical portion 45 provided on
each of the upper 5-4 and 9 -th positive wall surfaces 4 in FIG. 6 of the horn portion 40. A tip of
the cylindrical portion 45 is formed in a flange shape, and a pad 46 made of an elastic material
such as an annular rubber is fixed thereto to form a first holding portion 49. Further, an opening
52 is provided at the bottom 51 of the speaker unit 50 in which the speaker 55 is built, and a
second holding member having a U-shaped cross section is provided around the opening 52 as
shown in FIG. A section 54 is provided. Then, the first holding portion 49 and the second holding
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portion 54 are held, and the speaker unit portion 50 is rotatably mounted on the horn portion 40
with the cylindrical portion 45 as an axis, and the horn portion A back load horn type speaker 60
is configured by acoustically connecting the sound passage 42 of 40 to the back surface 55 B
side of the speaker 55 of the speaker unit 50.
A packing 46 made of an elastic material such as rubber is interposed between the first and
second holding portions 49. 54 so that the reproduced sound from the speaker 55 does not leak.
6- According to this embodiment having such a configuration, not only high efficiency and
uniform sound pressure response can be obtained in the bass region as well as the abovedescribed conventional hollow road horn type speaker, but also FIG. As shown by the solid line in
the figure, it is possible to obtain the effect of the image of the speaker by installing it at the
corner of the room, and the middle sound area and the high sound area in which the directivity is
emphasized in particular Since the front face of the speaker can be adjusted to an angle smaller
than 180 °, it is possible to widen the range of listening points as shown by the broken line in
FIG. FIG. 8 is another embodiment according to the present invention. This figure is a consoletype stereo device in which a tuner, an amplifier, a turntable and the like are integrally formed,
and a speaker (not shown) is incorporated in the side wall 71.72 of the console box 70 so as to
be rotatable in the arrow direction. A unit unit 75. 76 is installed, and one end of the not-shown
sound passage of the horn unit 85. 86 provided in the console box 70 is a sound on the back side
of the not-shown speaker of the speaker unit unit [75. The other end of the above-mentioned
sound passage is connected to the opening 85a $ 86a of the console box 9 to constitute a back
load horn type speaker 90.91. Further, the speaker unit portion 85. 86 can be housed inside the
console box 70 as shown by a broken line in the figure. According to such a configuration, it is
possible to efficiently reproduce the bass region and to adjust the directivity of the mid-tone
region and the high-tone region by rotating the speaker unit 75. 76 and using the stereo device.
By storing the speaker unit portion 75. 76 in the console box 10 when not in use, it is possible to
protect against accidental damage. As described above, according to the back load horn type
speaker according to the present invention, high efficiency and uniform sound pressure response
can be obtained in the bass region, and by moving the speaker unit portion, the middle sound 8-Since the directivity of the sound area and the treble area can be adjusted, it is possible to obtain
a wide range of listening points, and the intended purpose can be achieved.
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