JPS5079438

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DESCRIPTION JPS5079438
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional domeshaped speaker, FIG. 2 is a cross-sectional view of an inner periphery driven dome speaker, and
FIG. 3 is a cross-sectional view of the dome diaphragm of the embodiment of the present
invention. 2, 2 is a voice coil bobbin, 5 is a central portion of the dome diaphragm, and 6 is a
peripheral portion of the dome diaphragm. Yaichi 89 1 実 50-79438 (2)! −90=
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a
dome vibration plate 1 in which the mechanical strength is improved, of the dome diaphragm
driving portion in the inner periphery driven dome diaphragm. In general, a dome diaphragm has
a voice coil bobbin 2 attached near the boundary between the periphery of the dome diaphragm
1 and the outer peripheral support 9 as shown in FIG. 1, and the voice coil 3 wound around the
voice coil bobbin 2 is disposed in the magnetic gap 4 A voice current is supplied to the voice coil
3 to vibrate the voice coil bobbin 2 up and down, thereby vibrating the dome diaphragm-.
However, with the above structure, as the diameter of the dome diaphragm 1 increases, the
diameter of the voice coil bobbin 2 needs to be large, thus requiring a large magnetic gap and an
inner volume, and hence a large magnetic circuit. It had the drawback of costing or rising costs
as things were needed. In order to solve this defect, as shown in FIG. 2, the voice coil bobbin 2
with a small diameter is used for the inner periphery W ′ ′ of the dome diaphragm 1 and the
diaphragm 7 (diameter 7110 diameter, ie The caustic-drive ziv-rM- 'type dome diaphragm with
improved radiation efficiency, or the bonding portion between the voice coil bobbin 2 and the
dome diaphragm 1, that is, the dome 19 ball) Because the mechanical strength is lower due to
the structure, the drive energy from the voice coil bobbin 2 is not transmitted to the entire dome
diaphragm, and only the drive part vibrates partially to cause energy loss. And it was difficult to
reproduce enough. The present invention increases the mechanical strength of the attachment
portion of the voice coil bobbin 23 by changing the shapes of the central portion 5 and the
peripheral portion 6 of the dome diaphragm, so that the inner-peripheral drive dome type
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vibration except the above-mentioned conventional drawbacks. It is a board. The dome
diaphragm according to the present invention is a concave portion opposite to the central
portion 5 and the central portion 5 having the conventional convex curvature with the voice coil
bobbin 2 attachment portion as a boundary. It has the structure which integrally molded the
peripheral part 6 which has a curvature. l With such a structure, the slope or thickness of the
dome diaphragm at the attachment portion of the voice coil bobbin 2 is increased (the
mechanical strength in the vertical direction is significantly increased, or the drive energy due to
partial vibration at the attachment portion The loss is reduced and the drive energy is
transmitted to the entire diaphragm. Also, if it is attached to the folded portion of the curvature
of the attachment part of the voice coil bobbin 2 via an annular reinforcing plate disposed
concentrically with the dome diaphragm, the driving force is dispersed and transmitted by the
reinforcing plate 1 The strength is increased and the above effects are fully satisfied.
+ (D ('mjcl'-1,1 nm5 rL, -r aor * and + Y7'A-4) The effective mass is reduced, and the reproduction
frequency can be extended to a high frequency region. According to the present invention, the
speed + tM :) car using the dome diaphragm according to the present invention is sufficiently
reproducible to a high frequency region, and is mounted on the voice coil bobbin 2 or the inner
periphery of the dome diaphragm 1, thereby the dome diaphragm Even if the aperture diameter
is increased, the small magnetic circuit may be used, which has advantages such as downsizing.
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