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JPS5711889

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DESCRIPTION JPS5711889
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are longitudinal sectional views of the
main parts of a conventional speaker unit, and FIGS. 3 to 5 show different embodiments of the
speaker unit according to the present invention. It is a longitudinal cross-sectional view of the
principal part. 1 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии и и и и и и и и и и и и и и и и
diaphragm, 4a и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и 4 и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и gaskets
DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement K111 of
the facing portion of a spiller caninit, particularly a diaphragm and a gasket for securing the edge
to the frame. Heretofore, as a facing structure of the seed wire moving plate and the gasket, there
is one as shown in FIG. 1 or FIG. That is, in FIG. 1, the outer peripheral edge of the stomach Asoda edge A is fixed to the gasket BK and the ciframe cvcm, and the inner peripheral edge is fixed
to the peripheral surface of the flat diaphragm, so gaskets) B The difference in level with the flat
W diaphragm, that is, the unevenness is thick in, so there is a problem that the sound pressure
frequency characteristic is disturbed. In FIG. 2, since the slit portion E is formed by facing the
inner peripheral surface of the gasket B) and the outer peripheral surface of the flat diaphragm
in FIG. E is an acoustic path, and it is 1 in forming a Helmholtz resonator with the space F of the
edge A (y) it-le part. As a result, the above-mentioned resonator ecItg <<is generated at the
frequency where the radiation sound from the flat diaphragm has a disadvantage that the sound
pressure frequency characteristics are adversely affected. Therefore, the present invention is
intended to solve the above-mentioned drawbacks, and the adverse effect on the sound pressure
frequency characteristics of the edge distortion noise is realized by configuring the distance
between the opposing side surfaces of the diaphragm and the gasket to be nonparallel. The
purpose is to provide a speaker unit that can be reduced as much as possible. Hereinafter, the
present invention will be described in detail on the basis of the embodiments of the drawings,
and FIGS. 3 to 5 are respectively longitudinal sectional views of the main parts showing different
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embodiments of the speaker unit according to the present invention. 2 is a gasket, 2 m is an
inner shoulder side surface of the gasket 2, 3 # 'i frame, 4 is a diaphragm, 4a # i. It is a
circumferential side. Although the illustrated diaphragm 4 is a flat type, it is not limited to this.
Then, with the at least one of the side surfaces 2a or 4a of the inner peripheral side surface 2m
of the gasket 2 and the outer peripheral side surface 4a of the diaphragm 4 facing the front of
the speaker unit, the distance between the both side surfaces 2a and 41 is In the embodiment
shown in FIG. 3, only the inner peripheral side surface 2m of the gasket 2 is formed with a slope
wK. In the embodiment shown in FIG. Only the outer peripheral side 4a of the plate 4 is formed
to have a slope WJK. Further, in the embodiment of FIG. 5, both the inner peripheral side surface
2a of the gasket 2 and the outer peripheral side surface 4a of the diaphragm 4 are formed as
inclined surfaces. Therefore, as in the upper V, when the inner peripheral side surface 2a of the
gasket 2 and the outer peripheral side surface 4m of the diaphragm 4 appear to be non-parallel,
the sound path becomes short, and the Helmholtz resonator Since the resonance frequency is
high and moves out of the use band of the speaker unit, the adverse effect on the sound pressure
frequency characteristic of the resonance sound of the echo l becomes extremely small. The
sound pressure frequency characteristics are not disturbed by the step between the gasket 2 and
the diaphragm 4, that is, by the reduction of the irregularities on the front surface of the speaker
unit.
In the present invention, as shown in the drawing, both sides 2m of the diaphragm 4 facing the
edge 1 and the gasket 2 are provided. Since at least one side surface 2 & or 4m of 41 is formed
into an inclined surface in which the distance of 2m + 4m on both sides gradually decreases
toward the front, the radiated sound of the edge l decreases and the resonance sound of the edge
1 The adverse effect on the sound pressure frequency characteristics can be minimized. Also, if
the unevenness on the front of the speaker unit decreases, the sound pressure frequency
characteristics will not be disturbed by K, either. 0
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