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DESCRIPTION JPH0248000

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DESCRIPTION JPH0248000
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
means for improving the frequency characteristics of a speaker unit. [Prior Art] FIG. 4 is a
vertical cross-sectional view of the right half of a conventional speaker unit, in which (1) is a pole
piece, (2) is a magnet provided thereto, and (3) is this magnet The upper top plate (4) is a frame
fixed on the top plate and has a thin annular collar (4a) at the center. (5a) (5b) is a spacer holding
the damper (6) therebetween, and is interposed and supported between the annular flange
portion (4a) and the top plate (3). (7) is a diaphragm supported at the free end of the damper (6),
(8) is a voice coil co-operating with the diaphragm, (A) is a front surface of the damper (6) and
the annular ridge It is a cavity which consists of a minute space part in the back of part (4a). The
cavity (A) uses the resonance of the buttocks to raise the sound pressure level at a high
frequency to partially improve the characteristics. [Problems to be Solved by the Invention] The
conventional speaker unit is configured as described above, and since the resonance of the cavity
(A) is a single mode specified, even if there is an improvement in the characteristics, The problem
of being partially identified The present invention aims to provide the cavity with a high-range
characteristic improvement function so as to solve the above-mentioned problems. [Means for
Solving the Problems] In the speaker unit of the present invention, a resonator (B) is attached to
the cavity (A), and its resonance frequency is optimally adjusted. In the other inventions, the
cavity (A) Is communicated with the external sound field through a through hole (C) provided in
the frame (4). [Operation] In the speaker unit according to the present invention, the resonance
of the cavity is effectively dispersed, and the overall frequency characteristic is improved.
Embodiment An embodiment of a speaker unit according to the present invention will be
described below. That is, in FIG. 1, the same parts as those in FIG. 4 are given the same reference
numerals and their duplicate explanation will be omitted, but in the case of this invention, the
central annular ridge (4a) in the frame (4) With respect to the cavity (A) formed between the
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damper (6), a resonator (B) composed of the above frame (4), the top plate (3) and the spacers
(5a) (5b) It is characterized in that it is attached. Therefore, in the speaker unit according to the
present invention, the resonance of the cavity (A) is dispersed by the attachment of the resonator
(B), which makes it possible to improve the overall frequency characteristics.
The above-mentioned resonator is not limited to the one shown in the figure, and it is a matter of
course that a sound absorbing material may be provided in the resonator. 2 and 3 show another
invention of the present invention. In this case, a plurality of through holes (C) are provided in
the central annular ridge portion (4a) of the frame (4) to form a cavity. It is characterized in that
(A) communicates with an external sound field, and the other configuration is the same as that of
FIG. That is, in the case of the present invention, the resonance of the cavity (A) is dispersed to
the external sound field by the plurality of through holes (C) provided in the annular ridge (4a) of
the frame (4), whereby the overall frequency characteristic is It will be improved. The number,
the inner diameter and the shape of the above-mentioned through holes are not limited to the
illustrated ones. As described above, in the speaker unit according to the present invention, since
the resonances of the cavities are dispersed, an effect that the overall frequency characteristics
can be improved can be obtained.
[0002]
Brief description of the drawings
[0003]
1 is a vertical sectional view showing a half of a speaker unit according to the present invention,
FIG. 2 is a similar vertical sectional view showing another invention, and FIG. 3 is a bottom view
of a frame in FIG. FIG. 2 is a vertical sectional view showing a half of a conventional speaker unit.
In the figure, (3) is a top plate, (4) is a frame, (4a) is an annular ridge, (6) is a damper, (7) is a
diaphragm, (A) is a cavity, (B) is a resonator, (C) is a through hole. In the other figures, the same
reference symbols denote the same parts.
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