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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
improvement of a loudspeaker diaphragm in an electromechanical transducer.
2. Description of the Related Art Generally, high rigidity is required for a speaker diaphragm
body, while flexibility is required for an edge portion. In order to satisfy this requirement, various
types of edge structures of the speaker diaphragm have been proposed. For example, in the case
of a papermaking diaphragm, the outer peripheral portion of the diaphragm is thinly formed by
making separates, the corrugation is formed on the outer peripheral portion, and the diaphragm
barrel portion and the edge portion are separate members and the flexible edge portion is There
is one that is adhesively fixed to the body.
The diaphragm for forming the body and the edge of the separate member by bonding is used
frequently as a speaker diaphragm because the material structure of the body and the edge can
be freely selected. However, it is only adhesively fixed to the flexible edge member at the outer
peripheral edge of the trunk, and due to the lack of rigidity at the outer peripheral edge of the
trunk, the peak frequency characteristic of the speaker in the middle and high frequency parts or
There was a problem that dip occurred.
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention is directed to a diaphragm in which a speaker diaphragm body portion and an edge
portion are separately formed and bonded to each other. And a speaker diaphragm having
sufficient rigidity even at the outer peripheral end of the body.
Since the speaker diaphragm in the present invention has a structure in which the rising portion
is provided at the outer peripheral end of the body portion, a sufficient reinforcing effect can be
obtained in both the circumferential direction and the radial direction of the diaphragm body
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial side cross-sectional view of a
loudspeaker diaphragm according to the present invention, and FIG. 2 is a frequency
characteristic diagram of a prototype loudspeaker according to the present invention.
In FIG. 1, the code ¦ symbol 1 is a trunk ¦ drum of the cone diaphragm which paper-processed
pulp and made thickness 0.5 mm and provided the rising part 1a of height 1 mm in the outer
peripheral end.
The rising portion 1a of the body portion 1 is attached with the body portion 1 and the bonding
portion 2b of the edge 2 at a distance of about 0.5 mm so as not to contact the curved portion 2a
of the edge 2.
In addition, the code ¦ symbol 1b is an adhesion part 1b with a voice coil bobbin.
In the characteristic diagram of frequency (Hz) -sound pressure level (dB) shown in FIG. 2,
reference symbol A indicates the frequency characteristic of a 16 cm loudspeaker manufactured
on the basis of the diaphragm of this embodiment. Further, reference character B is a frequency
characteristic of a comparative example having the same shape and the same material as the
embodiment but having no rising portion at the outer peripheral end of the trunk portion. As
apparent from FIG. 2, in the comparative example, the sound pressure output is lowered due to
the generation of unnecessary vibration due to the lack of rigidity of the outer peripheral end of
the diaphragm body in the middle and high regions, and a wide dip is generated. Such dips are
not recognized.
As described above, according to the present invention, by providing the reinforcement portion
of the rising portion at the outer peripheral end of the diaphragm body portion, the speaker
oscillation capable of integrally moving the diaphragm body portion over the entire band of the
vibration. A plate is obtained, and an excellent speaker having acoustic characteristics with less
distortion and good frequency characteristics is realized.
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