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DESCRIPTION JPS5055833

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DESCRIPTION JPS5055833
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an
embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A-A of
FIG. [4] · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · cylindrical projections, 14 · · ·: second projections, 16.
DETAILED DESCRIPTION OF THE INVENTION '0 This invention relates to a novel structure
loudspeaker drive using a relatively large volume 1.11 "spacer of nonmagnetic material D). The
magnetic circuit of a loudspeaker using a ferrite magnet of f1 f is assembled by connecting a
plate, a magnet, a yoke having a ball ball or the like with a large number of torsions, and is
rooted to maintain a predetermined magnetic gap. A spacer was attached between the pole piece
and the plate by spot welding or the like. Such a configuration is merely based on the pursuit of
convenience 1) for assembling a magnetic circuit, and there are few advantages in terms of
performance. The present invention is intended to provide a loudspeaker unit # that is intended
to improve performance and to be convenient for assembly. The present invention will be
described based on an embodiment shown in the drawings. In FIG. 1, 1 is a yoke, 2 is a spacer, 3
is a plate, 4 is a ferrite magnet, and 5 is a line winding ring. The yoke 1 has a cylindrical
protrusion 11 projecting at right angles to one surface of the disk-like base 10, and is made of a
magnetic (2) single material. The spacer 2 has an inner hole 12 fitted to the protrusion 11 of the
yoke 1 and is a substantially cylindrical nonmagnetic material slightly shorter than the length of
the protrusion 11, such as aluminum or the like. The outer periphery of the tip end side of the
projecting portion 11 is formed in an enlarged manner 13 and further has three projecting
portions 14. The shape of the projection 14 is such that the cylindrical outer surface is partially
enlarged towards the end as seen in FIG. 11. The plate 3 has a circular hole 15 surrounding the
tip of the cylindrical projection 11 of the yoke 1 with a small gap 20 therebetween, and the
corresponding inner hole of the circular hole 15 of the spacer 2 A recess 16 is formed which is
enlarged and removably engages the projection 14 thereof. That is, as shown in the figure, the
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concave portion 16 has a projecting portion 21 facing inward due to the presence thereof, and
the tip of the projecting portion 21 abuts on the enlarged forming portion 13 of the spacer, The
protrusion 21 is divided into three parts, each of which becomes a notch 17 having a size such
that the protrusion 14 passes through. Therefore, as shown in FIG. 1, when the spacer 3 is
inserted from the lower side 3: of the plate 3 and rotated about 1/6, it is engaged as shown in
FIG. The ferrite magnet 4 has a simple short cylindrical shape, is fitted to the amount of charge of
the spacer 3, is disposed between the base of the yoke and the lower surface 18 of the subplate
of the subplate, and is in close contact with both of them.
In the figure, a 1911 yoke is connected to a spacer. There is no problem even if this screw 19 is
omitted in some cases. For example, when there is no failure in supporting the magnetizing
operation after assembly, or when the spacer 2 is firmly fitted or adhesively fixed to the
projecting portion 14. In the loudspeaker unit # configured as described above, the spacer 2
plays a role in reliably maintaining the relative positional relationship between the yoke 1, the
magnet 4 and the plate 3. In particular, the magnetic gap shown as the small gap 2o is reliably
maintained by the projection 111 spacer 2, the magnet 40 and so on. Furthermore, since the
magnet 4 is fitted to the spacer, even if the fitting is relatively smooth, there is no displacement
4. In this respect, it is extremely advantageous to use it in an on-vehicle loudspeaker. In addition,
since the spacer has a function also serving as a yo-to-ring, it is improved to extend the high
region of the frequency characteristic. In addition, since the predetermined positional
relationship can be obtained simply by the bottom metal of the part even when assembled, the
adjustment operation of the conventional positional relationship is not necessary. As described
above, according to the present invention, it is possible to provide an excellent loudspeaker and
drive unit using special spacers. In addition, the shape of the engagement part of a plate and a
spacer is not limited to the shape of the case 11 and the example of a vertebra, It can change
suitably.
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