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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle speaker, and more particularly to an on-vehicle speaker having good reproduction
characteristics in the low frequency range.
2. Description of the Related Art The transmission characteristics of an on-vehicle speaker
attached to a rear tray generally increase by about 10 dB with reference to the midrange level,
particularly in the low range.
Of course, if the diameter of the magnet is increased to form a magnetic circuit with a small Q0,
flat characteristics can be obtained, but there is a drawback that the cost is increased.
SUMMARY OF THE INVENTION The present invention has been made in view of the abovementioned point, and the purpose of the invention is to reduce the level of swell in the low
frequency range at low cost. To provide an in-vehicle speaker.
SUMMARY OF THE INVENTION A vehicle-mounted speaker according to the present invention
has a member for a rear emission noise low frequency band fixed to a window hole of a speaker
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehiclemounted speaker according to the present invention will be described with reference to FIGS. 1
and 2. FIG.
In the figure, reference numeral 1 denotes a cone type speaker, 2 denotes a frame of the speaker
1, and 3 denotes a window hole provided in the frame 2.
In this embodiment, the member 4 is fixed via an adhesive tape so as to close the window hole 3.
The member 4 is an acoustic resistance material (Nitto Co., Ltd., N0541) made of urethane and
asphalt material.
In the car-mounted speaker configured as described above, since the member 4 has the function
of absorbing and blocking the sound emitted from the rear surface, the low-cut filter is
acoustically formed to reduce the swell in the low-pitch range .
Characteristic A in FIG. 2 shows the characteristic according to the present invention, and
characteristic B shows the characteristic of the on-vehicle speaker according to the prior art.
Of course, the number of members 4 may be determined appropriately.
Effects of the Invention According to the in-vehicle speaker of the present invention, since it is
configured as described above, in particular, the excitement level in the low frequency range is
lowered and the sound quality is improved.
As a secondary effect, noise due to frame resonance is also reduced.
Brief description of the drawings
1 is a perspective view showing an embodiment of the present invention.
2 is the same characteristic diagram.
Explanation of sign
2 Frame 3 Window hole 4 member