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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a speaker drive unit
embodying the present invention, FIG. 2 is a cross-sectional view showing another example as
well, and FIG. 3 is an adjustment of the speaker drive unit of FIG. FIG. 6 is a partial cross-sectional
view showing a broken state. 1.19 · · · · · · · Magnets 2, 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · magnetic gap, 7.8 · · · ······ Voice coil, 9, 10 · · · · · · · · · · · · · · · · 11 · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · adjustment screw, 18 ·yoke.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a page change of
a speaker drive unit of a two-in-one system in which a woofer and a tweeter are coaxially
arranged with a common magnetic circuit. (1) f <t- / 7))? Conventionally, as a speaker driving
unit of this type, a gap made of a nonmagnetic material such as aluminum between the upper
plate and lower plate of the magnetic stripe path and the center pole or magnet 7 as a speaker
driving unit of this type A magnetic air gap is provided through the support ring, and one of the
woofer and the other of the tweeter voice coil are arranged. However, the strength of the
magnetic field required for both magnetic air gaps is different, and since both magnetic air gaps
consisted of only magnetic series circuits, changing one changes the other as well. In the present
invention, in which it was difficult to set the bias appropriately, a magnetic bypass circuit was
provided in parallel with one magnetic gap, and the flux density of both magnetic gaps was made
independent by adjusting this bypass amount. To provide a speaker driving unit that can be set
arbitrarily. The configuration of this invention will be described below with reference to an
embodiment shown in the drawings. In FIG. 1, the inner peripheral walls of the upper plate 2 and
the lower plate 3 located at both ends of the ring-shaped ferrite magnet 1 and the outer
peripheries of both ends of the central magnetic pole 4 located at 4τ 'in the center. Between the
walls, magnetic air gaps 5 and 6 are coaxially formed and held by the gap support rings 11 and
12, respectively. The voice coils of the dome-shaped diaphragm 9 for the high region are
disposed in one magnetic gap 5, and the voice coils 8 of the cone-shaped diaphragm 10 for the
low region are disposed in the other magnetic gap 6. Energy is radiated through a horn 15
hollowed out inside the central magnetic pole 4 and a horn 16 connected to a cone-shaped
diaphragm 10 connected to the horn 15. The gap support ring 12 of one lower magnetic gap 6 is
formed of a nonmagnetic material, and the gap support ring 11 of the other high magnetic gap 5
is formed of a magnetic material. The parallel circuit of the magnetic gap 5 and the support ring
11 and the magnetic gap 6 form a series circuit. The magnetic air gap 5 (3) passes through the
support ring 11 by changing the reluctance of the magnetic circuit comprising the support ring
11. -The bias amount of j- "ζ changes to v5 °. That is, the higher the magnetic permeability of
the support ring 11, the stronger the contact area with the plate 2 or the magnet 1 with the dog,
and the thicker the thickness, the magnetic resistance decreases and the magnet passes through
the support ring 11. The magnetic flux increases and the magnetic flux passing through the
magnetic air gap 5 decreases.
The gap support ring 11 is fixed to the top plate 2 and the center ball 4 by suitable means such
as spot welding, fitting, screwing, etc. FIG. In the case of the internal magnetic type magnetic
circuit, as in the case of the external magnetic type shown in FIG. In FIG. 2, parts corresponding
to FIG. 1 are indicated by the same reference numerals. Because of this configuration, the
magnetic flux passing through the low-range magnetic gap 6 is divided into the high-range
magnetic gap 5 and the bypass gap support ring 11 that forms a series of magnetic paths. When
the amount of bypass passing through the support ring 11 (4) is changed, the magnetic flux i 'KP
F of the magnetic air gap 5 8. . ˜. The values are set almost independently, 6 degrees, 6 degrees,
3 numbers and so on. When the adjustment screw is tightened, the periphery of the support ring
11 is pushed down in the state shown in FIG. 3 to create a gap between the support plate 11 and
the upper plate 2 to increase the reluctance and reduce the diversion flux, Along with this, the
magnetic flux density of the magnetic gap 5 increases. As the magnetic flux density increases, the
sensitivity of the woofer is almost the same while the sensitivity of the tweeter is increased, and
the high range sound is emphasized from before the low range. By finely adjusting the bypass
amount, the reproduced sound pressure level between the high frequency sound and the low
frequency front may be appropriately changed, the sound quality may be corrected, or the sound
quality may be arbitrarily set according to the listener's preference or the surrounding
environment. This adjustment is easily performed from the outside when the diaphragm cover 17
is removed. The one gap support ring 11 made of magnetic material may be formed integrally
with the top plate 2 and the center plate 4. As described above, according to this invention, one
of the gaps (5)-sana)-IJ nog holding a pair of magnetic gaps common to the magnet is formed of
a nonmagnetic material and the other of a magnetic material. Thus, the magnetic flux density of
the pair of magnetic gaps can be arbitrarily and independently set, and a pair of magnetic gaps
having magnetic flux densities suitable for each of the high band speaker and the low band
speaker can be easily formed. Also, by configuring the magnetic resistance of the magnetic
circuit to be adjustable, it is possible to control the sound reproduction level of high and low
frequencies according to preference, or adjust the sound quality and frequency characteristics
according to the environment. it can. Further, the magnetic material for bypass can be used
commonly by changing only the material of the conventional gap support ring, and a practically
excellent effect can be obtained.