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JPS5685492

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5685492
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional ring
speaker, and FIG. 2 is a cross-sectional view of the speaker of the present invention. '1.17 is a
diaphragm, 2 and 3 is a voice coil, 4 is a voice coil bobbin, 5 is a magnet, 6 is a plate, 7 and 15 is
a center pole, 8 is a horn, 9 is an equalizer, 10 is a magnetic 11.12 is a clamper and 13 is a
screw.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker for
improving sound pressure by effectively utilizing the leakage flux of a magnetic circuit.
Conventionally, as shown in FIG. A magnetic circuit is formed by the madite 5 and the blade 1
and a magnetic gear knob 16 is formed between the center ball 15 and the plate 14. The
cylindrical voice coil povin 4 is positioned in the red プ pole 2 of the magnetic gap 16 at the
projecting ridge of the annular diaphragm 17 having a V-shaped cross section. The central flat
plate portion of the diaphragm 17 is clamped by the clamper 11 from above and below, and the
clamper 11 is clamped by the center hole 15 and the equalizer 9 and tightened by screws 13
from the lower surface of the center pole 15. The peripheral portion of the diaphragm 17 is
clamped by the annular clamper 12 from the unit i: F, and the clamper 12 is clamped by the plate
14 and the annular horn 8 and tightened by the screw 13 from the annular horn 8. At this time,
only the linear portion of the magnetic flux between the center pole 15 and the flat 14 is used to
drive the pinion 1, and the magnetic flux that goes around the other magnetic gap is effectively
used as a leakage flux. It was not. The present invention was devised to eliminate the abovementioned drawbacks, and a drawing (Refer to the embodiment shown, as shown in FIG. 2, the
center hole 7, the magnet 5, and the plate 6 constitute a magnetic circuit, The outer peripheral
edge upward of the pole 7 and the inner peripheral edge of the upper surface of the flat 6 are
chamfered to form an air gap 10 between the center pole 7 and the plate 6. A voice coil 2 of the
spiral printed wiring 3 is attached to the surface of the diaphragm 1 located above the magnetic
gap 10, and a cylindrical voice coil bobbin mounted with the voice coil 3 located in the middle of
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the magnetic gap 10 The upper end of 4 is attached to the lower surface of the diaphragm 1. The
voice coil 2 and the voice coil 3 are connected in series or in parallel, and drawn from above and
below the central flat plate portion of the diaphragm 1 by the clamper 11, the clamper 11 by the
center ball 7 and the equalizer 9, and a screw from the lower surface of the center ball 7 Tighten
at 13. The peripheral portion of the diaphragm 1 is clamped by the annular clamper 12 from
above and below, and the clamper 12 is clamped by the plate 6 and the annular horn 8 and
tightened by the hysteresis 13 from the annular horn 8. Since the present invention is structured
as shown in L, the linear portion of the magnetic flux between the center ball 7 and the plate 6 is
used to drive the voice coil 3, and the magnetic flux circulating above the magnetic gap 10 is a
Heuss coil, It is used for driving of (2), and the conventional sound pressure is improved by about
1.24 B, and the magnetic gear tube-Lll surface leakage flux is actively used.
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