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JPH08331684

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DESCRIPTION JPH08331684
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic lens device for improving the directivity of a speaker used in various audio equipment.
[0002]
2. Description of the Related Art Heretofore, in this type of loudspeaker, in a sharp directivity
frequency band, the indirect sound component is insufficient to impair the sound quality, and the
sound quality largely changes depending on the listening position.
[0003]
FIG. 3 shows the configuration of a conventional acoustic lens device.
In FIG. 3, a plurality of disc-shaped through-hole plates 6 having different central hole diameters
and having a plurality of small holes 5 formed therein are attached to the front of the speaker 7
at the inner side of the fixed frame 8 It arranges in multiple layers so that a hole diameter may
become large. In such a prior art, it forms so that sound conduction may become short toward
the central part, and the propagation of sound is delayed by the length of the sound conduction
formed between the disk-shaped through-hole plates 6, etc. The directivity is broadened by
making the wave front of the phase into an arc shape.
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[0004]
However, in the above-described conventional configuration, although the control of the phase
distribution can be performed, the intensity distribution of the sound pressure is hardly changed,
so the diffusion effect is small, the number of parts is large, the assembly is easy and the cost is
increased. Had the problem of being disadvantageous in terms of
[0005]
The present invention is to solve such conventional problems, and it is an object of the present
invention to provide an acoustic lens device having a large diffusion effect and having excellent
acoustic performance and mass productivity etc. that can be easily attached to a speaker
inexpensively and easily. It is
[0006]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the acoustic
lens device of the present invention is disposed on the front of a conical cone of a speaker and
has a circular opening at its central portion. Concentric from the center of the opening and
equally spaced from the center of the radial direction, and equiangularly to the direction of
rotation, gradually longer from the center of the opening in the radial direction as the center is
farther from the center in the radial direction A plurality of sound guides are provided.
[0007]
With this configuration, when cone paper is used as the primary sound source, the opening at the
central part of the acoustic lens device becomes the secondary sound source to reduce the
effective area of the sound source, and the intensity distribution control of the sound source is
also easily performed Can spread the sex widely.
Further, the openings are provided at equal positions in the radial direction of the concentric
circle from the center and provided with holes having the same diameter at equal positions with
respect to the rotation direction, and the holes are formed in the radial direction from the center
of the opening By gradually lengthening the length of the sound guide as it is separated from the
center in the radial direction, phase control can be made to advance the phase of the central
portion from the outside, thereby becoming a spherical wave and broadening the directivity
further It is possible.
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[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the acoustic
lens device according to the present invention will be described with reference to FIGS. 1 (a) and
1 (b).
In FIG. 1, reference numeral 1 denotes a speaker, and an acoustic lens device 3 is fixed to a front
surface of a conical cone paper 2 of the speaker 1 by a screw 4.
The acoustic lens device 3 has an opening 3a whose center is opened in a round shape, and a
rotational direction centered on the opening 3a at equally spaced positions in a concentric radial
direction from the center of the opening 3a. On the other hand, a perforated sound conductor 3b
of the same diameter is provided at an equal angle position, and the length of the sound
conductor 3b perforated in the radial direction from the center of the opening 3a The thickness
is gradually increased by changing the thickness of the hole plate 6.
[0009]
With the above configuration, control of the phase distribution of the sound source, that is,
changing the propagation path length so as to advance the phase of the central portion from the
outside, control of the intensity distribution of the sound source (sound pressure distribution),
that is, the center It is possible to efficiently increase the strength of the part from the outside.
[0010]
A comparison of the acoustic lens device configured as described above with the prior art is
shown in FIG.
FIG. 2 shows the output sound pressure and frequency characteristics when applied to a coneshaped full-range speaker, and FIG. 2 (a) shows the conventional case of FIG. 3 (b) when FIG. 2
(b) does not use an acoustic lens device. In the case of the acoustic lens device, FIG. 2 (c) shows
the measurement results in the case of the acoustic lens device according to the embodiment of
the present invention shown in FIG. In the figure, 0 °, 30 ° and 45 ° indicate directivity, and
indicate that the measurement point is 0 °, 30 ° and 45 ° with respect to the central axis of
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the acoustic lens device.
[0011]
As is clear from the above FIG. 2, in the acoustic lens device of the present invention, it is
confirmed that the variation of the output sound pressure level at each measurement point at
frequencies up to 10 kHz (especially 2 kHz to 10 kHz) is small and stable. It was done.
[0012]
As is apparent from the foregoing embodiments, the present invention has a circular opening at
the center, and is equally spaced from the center of the opening with respect to the concentric
radial direction and A sound conductor perforated at equal angular positions with respect to the
rotational direction is provided, and the length of the sound conductor perforated in the radial
direction from the center of the opening is gradually lengthened as it is separated from the
center in the radial direction. By simply mounting, it is possible to perform intensity distribution
control and phase control of a sound source at low cost and to effectively diffuse the directivity
of the speaker.
[0013]
Brief description of the drawings
[0014]
FIG. 1A is a front view of an acoustic lens device according to an embodiment of the present
invention.
[0015]
Fig. 2 (a) Output sound pressure and frequency characteristics in the case of a cone type full
range speaker alone
[0016]
Fig. 3 Cross section of the conventional acoustic lens device
[0017]
Explanation of sign
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[0018]
1 speaker 2 cone paper 3 acoustic lens device 3a opening 3b sound conduction
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