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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker, and more particularly to an improvement of the speaker suitable for use in vehicles.
2. Description of the Related Art FIG. 4 shows an example of a conventional coaxial speaker,
including a speaker for reproducing low frequency (hereinafter, woofer) and a speaker for
reproducing high frequency (hereinafter, tweeter). It is a built-in speaker. That is, in the figure,
the yoke 1, the magnet 2 and the plate 3 constitute a magnetic circuit of the woofer portion, and
the diaphragm 4, the edge 5, the damper 6 and the voice coil 7 constitute a woofer portion. The
tweeter 8 is screwed into the center of the woofer.
[0003] Conventionally, since the space for mounting the in-vehicle speaker is limited due to the
mounting, the embedded size of the speaker can not be taken, so the angle of the diaphragm 4
can be sufficiently taken. When the frequency becomes higher than the midrange frequency, the
edge portion resonates and may vibrate in the opposite phase to the diaphragm 4. Therefore, the
frequency characteristic of the conventional speaker shown by the curve A of the frequency
response characteristic graph of FIG. As a result, dips called midtone valleys tend to occur in the
characteristics, which degrades the sound quality.
As a countermeasure, there is a method of narrowing the width of the edge 5 to reduce the
radiation area, a method of making the edge heavy and hard, etc. However, the minimum
resonance frequency tends to be high, the sound pressure level tends to be low, etc. There is a
disadvantage of
In addition, as shown in FIG. 5, it is possible to apply a dump material 9 to the edge portion to
reduce dips in the medium sound, but since the connecting portion of the diaphragm 4 and the
edge 5 is flat, the dump material sags Easy, making it difficult to apply the dump material.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a speaker
capable of improving the sound quality by making it possible to set the angle of the diaphragm
without deepening the embedded size of the speaker.
SUMMARY OF THE INVENTION According to the present invention, in the speaker supporting
the diaphragm by the edge, the connecting portion between the outer peripheral portion of the
diaphragm and the edge is formed with an inverted V-shaped angle. Is the gist.
[Operation] In the speaker having the above-described configuration, vibration is produced under
the same conventional speaker embedded dimension by providing an inverted V-shaped angle at
the connecting portion between the outer peripheral portion and the edge of the diaphragm. I
can take the angle of the board.
1 and 2 show an embodiment in which the present invention is applied to a coaxial speaker, and
the same or similar members as in FIG. 4 are designated by the same reference numerals.
That is, 1 is a yoke, 2 is a magnet, 3 is a plate, 10 is a diaphragm, 5 is an edge, 6 is a damper, 7 is
a voice coil and 8 is a tweeter. An inverted V-shaped angle is given to the joint portion of the
above-mentioned to form an inverted V-shaped portion 11.
According to the above configuration, since the diaphragm 10 has the diaphragm angle by the
reverse V-shaped portion 11 under the same embedding dimension as the conventional one, the
curve B of the frequency response characteristic graph of FIG. As shown in the frequency
response, it suppresses valleys in the midrange and works to improve the sound quality.
Also, if the valley of the midrange can not be suppressed well, even if the dump material 9 is
applied as shown in FIG. improves.
According to the present invention, the following effects can be obtained.
(1) Since the angle can be taken from the diaphragm without changing the embedded size of the
speaker by giving the inverted V-shaped angle to the connecting portion between the outer
peripheral portion of the diaphragm and the edge, reproduction to a higher frequency range is
possible. Is possible.
(2) Since the strength of the outer peripheral portion of the diaphragm, which is a drawback of
thin cone paper, is significantly increased, the piston motion zone can be expanded.
(3) The dump material can be easily applied.
Thereby, it is possible to absorb the reflection of the edge and fill the dip in the midrange.
Brief description of the drawings
1 is a partial cutaway side view of a coaxial speaker showing an embodiment of the present
2 is an enlarged sectional view of the inverted V-shaped portion between the diaphragm and the
3 is a cross-sectional view of the inverted V-shaped portion coated with the dump material.
4 is a partial cutaway side view of the conventional coaxial speaker.
5 is an enlarged cross-sectional view of a diaphragm-edge joint portion coated with a dump
6 is a graph showing the frequency response characteristics of the speaker.
Explanation of sign
Reference Signs List 1 yoke 2 magnet 3 plate 4 diaphragm 5 edge 6 damper 7 voice coil 8
tweeter 9 dump material 10 diaphragm 11 reverse V-shaped portion
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