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JPS5513440

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DESCRIPTION JPS5513440
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
speaker, FIG. 2 is a cross-sectional view showing an embodiment of the speaker of the present
invention, and FIG. 3 is a top view of a reinforcing member used for the speaker. FIG. 4 is a crosssectional view of the same reinforcing body. 15 ····· Magnetic circuit, 20 · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · new surface M-shaped diaphragm, 23 · · · · · · · · · · · · · funnel shape Portions 25
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · L2B · · · · · · · · · · 30 · · · · · · · · magnetic gap , 31 .....
Dust cap.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker using
an imaging plate having an M-shaped cross section, and is intended to improve the reproduction
frequency band. A conventional loudspeaker of this type is configured as shown in FIG. Eight or
less, -kyl-g-Jvl, o, 7-7 -1 · · (5 (-one. 22. A frame e is coupled to a magnetic circuit 6 constituted by
a ring-shaped magnet 3 and a ring-shaped upper plate 4, and a diaphragm 8 is formed in an Mshaped cross section together with a gasket 7 at an edge between the frames 60. Attach the
engine 9, connect the voice coil 10 to the center of this diaphragm 8, hold the middle part of this
voice coil 10 by the damper 11, and eccentrically lower the voice coil 1o to the magnetic cap 12
of the magnetic circuit 6 The ring-shaped reinforcing plate 13 is disposed downward of the
diaphragm 8 so as to connect the center portion and the peripheral portion, and the domeshaped dust cap 14 is attached to the center of the upper surface of the diaphragm 8 There is.
The diaphragm 8 having such an M-shaped cross section has a defect that a node is generated
due to the bending movement of the diaphragm and compliance is achieved at this node portion,
so that reproduction can not be performed at frequencies above a certain frequency. In order to
eliminate this defect, a ring-shaped reinforcing plate 13 is used, but the ring-shaped reinforcing
plate 13 can not obtain a sufficient effect, and it takes time to incorporate it) making positioning
of the mounting position difficult. It was a poor thing of the case. The present invention
eliminates the above-mentioned conventional drawbacks. Hereinafter, an embodiment of the
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present invention will be described with reference to FIGS. A magnetic circuit 15 comprises a
plate 1 having a center ball 16, a ring-shaped magnet 18 and a top plate 19, and a frame 2o is
coupled to the magnetic circuit 15. An edge 23 of the diaphragm 22 having an M-shaped cross
section is adhesively bonded to the portion together with the gasket 21. The funnel-shaped
portion 24 of the diaphragm 22 is made of synthetic resin or metal in which several triangular
reinforcing ribs 26 whose width gradually widens from the lower end to the circumferential
surface of the cylindrical body 26 are provided radially. The reinforcing body 27 is coupled. That
is, the outer side of the reinforcing rib 26 is an inclined surface that matches the inclination of
the funnel-shaped portion 24 of the diaphragm 22, and the outer side of the reinforcing rib 26 is
bonded to the funnel-shaped portion 24 with an adhesive. There is. The upper portion of the
voice coil 28 is bonded to the lower end of the cylindrical body 26 of the reinforcing body 27 by
bonding or the like, the middle portion of the Heuss coil 28 is held by the damper 29, and the
lower portion of the voice coil 29 is the above magnetic circuit The 16 magnetic gaps are known
to be eccentric without knowledge of eccentricity.
Furthermore, a dome-shaped dust cap 31 is attached on the funnel-shaped portion 24 of the
diaphragm 22. Since the speaker of the present invention is configured as described above, the
funnel of the central portion of the diaphragm M-shaped diaphragm Since it is reinforced by the
reinforcements and reinforcements, it is possible to prevent the bending movement of the top of
this promotion 1 plate, and the vibration of the voice coil is also transmitted through this
reinforcement, so that the loss is small and the whole diaphragm is Over the same time, the voice
coil can be vibrated faithfully, the reproduction frequency band can be extended by almost an
octave, the reinforcement body can be easily incorporated, and the productivity can be improved.
It is.
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