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Description 1, title of the invention
3. Detailed Description of the Invention The present invention relates to a speaker which is made
to emit V-sound due to the vibration of a cone by passing a voice current to a moving coil
disposed in a magnetic field. --- j The cone used conventionally for this type of speaker is a paper
or pulp pressed and solidified by pressing at the time of installation, and once it is molded, its
tension V ) F! : Because it was impossible to adjust at all, its acoustic characteristics were fixed, so
to speak, and even if there were some deficiencies in the characteristics, they could not be
corrected. Also, even if the best acoustic characteristics are obtained, the cone is made of paper,
pulp and other materials, so its stiffness changes due to changes in humidity or aging, and the
acoustic characteristics gradually deteriorate. In this case, the above-mentioned stiffness can not
be adjusted even in this case, so that there is a drawback that this can not be corrected. It is an
object of the present invention to provide a speaker in which the tension of the cone can be
adjusted as needed so that optimum acoustic characteristics can always be obtained. EndPage: 1
or Less This configuration will be described based on an example shown in the drawing. As
known in FIG. 1, (1) is an electromagnetic magnet, and a coil bobbin (i) is formed in a gap (2)
formed between both electrodes. 3) is provided, and the bobbin (3) K is an electrical signal? A
feeding moving coil (4) is wound and fixed. Further, +51 is a 4iWl-shaped frame fixed to the front
surface of the electromagnetic magnet (1) and projecting forwardly, and an outer peripheral edge
(6) is provided in the radial direction of the tip outer periphery. Further, the cone (7) is fixed to
the inner peripheral edge thereof and the coil bobbin (3), and the outer peripheral edge is fixed
to the outer peripheral edge (6) of the frame (5) to stretch along the front surface of the frame
(5). In the present invention, this cone (7) is provided with a tension V adjustment mechanism At,
and is set so as to be able to adjust its stiffness (that is, in the illustrated embodiment, the outer
peripheral edge of the frame (5) A recessed groove (8) is formed in the portion (6) to open
forward (rightward in FIG. 1) over the entire circumference thereof, and an elastic material such
as rubber is formed on the front side of the recessed groove (8) The thin-walled annular elastic
ring (9) formed is distributed and fixed to the outer peripheral edge thereof and the outer
peripheral side of the groove (8), the inner peripheral edge of the ring (9) being the tip of the
cone (7) It adheres to the outer periphery. Further, on the front surface of the elastic ring body
(6), a two-annular presser plate a2 having a projecting ridge a provided so as to correspond to
the recessed groove (8) is covered, and the presser plate q2 C. By tightening the outer peripheral
edge (6) K screwed adjustment screw a 3... So as to clamp the 5 * ring (9) between the outer
peripheral recording portion (6) It has become.
In this embodiment, when the adjusting screw α3a3 @ ···· is tightened first and then turned in
the direction shown in FIG. 1, the holding plate α is an elastic ring as shown in FIG. (9) is pushed
forward in the direction of arrow a against the elasticity of (9), and along with this, the ridges a
つ の of the presser plate a form a central shape of the elastic ring (9) As it bends, the inner
peripheral edge of the elastic ring (9) moves in the direction of the arrow, whereby the outer
peripheral edge of the cone (7) is pulled in the extension direction, and tension is applied to the
cone (7). And their stiffness changes. On the contrary, when the adjusting screw + 13Q3---1 is
turned in the loosening direction, the presser plate α2 is pushed in the opposite direction by the
elastic force of the elastic ring (9), thereby the elastic ring Since the bent state of (9) is also
restored, the cone (7-ton tension or weakening). In FIG. 1, a4I is in the periphery of the cone (7) no ffi, and the cone (7) The damper (10) is shown as being tensioned between the frame (5) and,
as is known, the moving coil (4) is located in the middle of the gap (2) formed between the poles
of the magnet (1). To support the cone (7). As described above, in the present invention, the cone
(7) is located between the coil bobbin (3) of the moving coil (4) and the outer periphery a (6) of
the frame (5)? And with the tension, the cone (7) its stiffness? Since the adjustable tension V
adjustment mechanism is provided, the stiffness of the cone (7)? The tension i can be freely
adjusted, so that it is possible to adjust the tension of the sound (-, 1) when the cone (7) is
stretched and correct its acoustic characteristics. Furthermore, even if the tension of the V-cone
(7) is lost due to humidity, aging, etc., and the acoustic characteristics thereof are deteriorated,
the tension of the V-cone (7) may be generated. It is also possible to correct with the degraded
acoustic characteristics and thus always obtain the best acoustic characteristics.
4. Brief Description of the Drawings Fig. 1 is a longitudinal sectional view showing an
embodiment of the present invention, and Fig. 2 is an enlarged longitudinal sectional view
showing an operation of a tension adjusting mechanism of a cone in the embodiment. (3) ■ · · ·
Coil bobbin (4) e · · 0 Moving coil + 51-· · · Frame '(7) Temple · · · Cone EndPage: 2