JPS5663197

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DESCRIPTION JPS5663197
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are half sectional views of a general
loudspeaker, and FIGS. 3 to 6 are sectional views of the main parts showing an embodiment of
the loudspeaker of the present invention, and FIG. FIG. 10 is a cross-sectional view of the main
part showing another embodiment of the present invention. 5
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...... drive cone 16 ...... bobbin, 17 ... ... flat portion, 18-21 ...... bent portion .
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
using a flat diaphragm. In particular, it is intended to improve the quality by adding
improvements to the voice coil or drum 1 coupled to the flat diaphragm. In general, a speaker
using a flat diaphragm is configured as shown in FIG. 1 and FIG. 2 of FIG. That is, the plate shown
in FIG. 1 has a center pole 1. Ring-shaped magnet3. Similarly, the magnetic circuit 51C frame 6
constituted by the ring-shaped upper plate 4 is coupled. The peripheral portion of the edge 8 is
fixed to the peripheral portion of the frame 6 together with the gasket 7, and a flat plate
diaphragm 11 constituted by sticking the skin material 10 vertically to the edge 8 is connected to
the edge 8 The voice coil 12 is coupled to the lower surface of the plate 11, and the middle
portion of the voice coil 12 is held by the damper 13. The lower portion of the voice coil 12 is
fitted in the magnetic gap 14 of the magnetic circuit 5 without being eccentric. The configuration
shown in FIG. 2 is such that the flat plate diaphragm 11 and the voice coil 12 are coupled via the
cone-shaped drive cone 15. In such a speaker, a flat portion as a sticking margin 3 has been
conventionally provided with a width of 1 to 4 u at the upper end of the bobbin '16 of the voice
coil 12 coupled with the flat plate vibration plate 111C and the upper end of the drive cone 15
Distortion of the flat portion or distortion 1 causes warpage, or the shape of the bobbin 16 or the
drive cone 15 itself is distorted. As a result of deformation, adhesive bonding with the flat
diaphragm 11 becomes insufficient, and abnormal noise is generated in this portion, and gap
scraping of the voice coil 12 is generated. あった。 The present invention eliminates the above-
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mentioned conventional drawbacks. The following five embodiments of the present invention will
be described with reference to FIGS. The overall structure of the speaker is the same as in FIG. 1
and FIG. 2, so only the sticking portion of the flat plate diaphragm 11 and the bobbin 16 of the
voice coil 12 and the drive cone 15 will be described here. Do. 1 to 6 are examples of a type in
which the voice coil 12 is directly coupled to the flat plate diaphragm 11. In FIG. 3, a downward
bending portion 18 is provided on the outer peripheral portion of the flat surface portion 17 'of
the upper end of the bobbin 16 in FIG. And a horizontal bending portion 19 provided at the
lower end of the bending portion 18, and FIG. 5 shows a bending portion 20 forming a cylinder
on the outer peripheral portion of the flat portion. 6 is provided with a bent portion 21 such that
the flat portion 17 is doubled on the outer peripheral portion of the flat portion 1R. It is intended
to measure the mechanical strength and maintain the shape of the bobbin 16 of the voice coil 12.
The embodiment shown in FIGS. 7 to 10 is an embodiment of the type using the drive cone 15,
and FIG. 7 shows the outer peripheral portion of the flat portion 17 for attaching the drive cone
15 to the flat plate diaphragm 11. Bent 18 down. In order to double the flat part 17 in FIG. 10,
the fold part 20 which forms the cylinder in FIG. It is an attempt to maintain the shape of the
drive cone 15 by measuring the mechanical strength of the flat portion 17 as well as the
unconventional speaker such as .5 or more. Since the flat portion of the voice coil and the drive
cone attached to the flat plate of the voice coil and the drive cone is mechanically reinforced, it is
difficult to cause deformation or the like, and adhesive bonding can be performed firmly and
correctly. There is no fear of adhesion peeling by this, also the occurrence of abnormal noise in
this adhesion part. Also, the gap wear of the voice coil is eliminated, the characteristic 1 quality
can be stabilized, the nodal circle of the flat plate diaphragm can be driven accurately, the
improvement in characteristics can also be measured, and the cost becomes structurally low It is
of great value.
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