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DESCRIPTION JPS5356821

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DESCRIPTION JPS5356821
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view showing 'an example of
a flat panel speaker to which the present invention can be applied, FIG. 2 is a longitudinal
sectional view along line A-A, FIG. 3 and FIG. The figure is a perspective view showing an
example of a reinforcing member. 1 is a frame, 2 is a flange, 3 is a magnetic circuit unit mounting
part, 4 is a rib, 5 is a magnetic circuit unit, 6 is a composite diaphragm, 7 is a yoke, 10 is a yoke
plate, 16, 17 and 18 are reinforcements It is.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
having a plurality of vibration systems such as flat type loudspeakers, and is a book which is
intended to prevent resonance at the time of driving by 1%. FIG. 1 is a schematic plan view
showing an example of a flat type speaker to which the present invention can be applied, and
FIG. 2 is a longitudinal sectional view taken along the line A-A. In the figure, (1) presents a square
planar contour, for example, the entire frame made of die cast alloy +12) is its flange, tag (aa. 3b,
3C, 3d) are integrally VC-formed through a plurality of ribs (4) at four positions on the back side
of the 7 flanges (2), and the mounting of the magnetic circuit unit is part ++ 51 (5 ^, 5B, 5C- 50)
a magnetic circuit unit fixedly disposed at the portion 131, and 16) a flat composite imaging
plate driven by the magnetic circuit unit, the composite diaphragm + 4311d foam plastic or other
The book is a book in which various skins (6b) are applied to both sides of a core (6a) made of a
material (including two cam plates). Also, the structure of each magnetic circuit unit (5) is known
(U-shaped yoke (7), magnet (8), pole (9). Yoke plate squeal, loosely fitted around ball (9) and
wound around the bobbin facing the magnetic gap with the diaphragm (bobbin l υ and this
bobbin α υ and play coupled with 6) 11 [1 A flexible damper Q3 made of an appropriate
material, for example, a corrugated disk, is provided between the movable coil 0 and the bobbin
αυ and each portion 131, for example, a corrugated disk. [14 denotes an edge member such as
rubber or urethane that connects the peripheral portion of the sliding plate 161 and the flange
(2), and Q5 denotes a center cap. By the way, the frame Ill of such a type of speaker is made by
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using a press-molded product etc. in addition to the Yastome product of the da-1 · · · 1 λ (2), its
flange portion has sufficient strength, and The seven rungs are fixed to the cabinet Kl. On the
other hand, if the rear side of the frame is rounded to make the aperture ratio of the moving
plate 161 large and the S air circuit unit attachment is supported by the rib (4), its strength is
relatively weak I have no choice. Accordingly, in the case where the assembled speaker is driven,
there is a problem that the mass of each magnetic circuit unit (5) and the attachment thereof are
likely to cause a resonance phenomenon due to the relationship with the stiffness with the
portion 131. Frequency characteristic, and it has a negative impact on hearing. Incidentally, the
movement mode of the resonance is that each magnetic circuit unit (5) vibrates to the outside of
the frame (1) with the side of the outer lip as a fulcrum as shown by a dashed dotted line (5 ') in
FIG. The amplitude is maximum at the bottom of each unit.
The purpose of the present invention is to propose a simple and rational means for effectively
avoiding the co-shooting as described above. In the present invention, as shown in FIG. 1, for
example, as shown in FIG. 92, a thin disc-(see FIG. 3) is applied as a reinforcing member to the
bottom of each (31 magnetic circuit unit (5). All the magnetic circuit units (5A) + (5B), (5C) and
(5D) are connected with screws via the provided screw holes (16), and the outward direction of
each unit is recommended. In order to prevent the above-mentioned resonance. In this way, each
magnetic circuit unit (5) is integrated with respect to vibration, and since the axes of the other
units are mutually regulated, the deterioration of the frequency ll # characteristic accompanying
resonance as before is avoided. It can. Since the force applied to the one disk αe is mainly the
expansion and contraction force in the radial direction, it is sufficient for the part 1 to be
considerably thin. FIG. 4 shows another example of a reinforcing member, a connecting plate αL,
which, in place of the disk of the previous example, has screw holes (17 ') at both free ends of
each crossing piece, using its shape as a cruciform. However, it is easy to obtain the same effect
and effect as those of the disc 16) by combining the four magnetic circuit units (5) with the
connecting plate tI71. You will understand. (4) The above is a specific example of the present
invention in the case where the bottom portions of the magnetic circuit units + 51 (5A, 5B, 5C,
5D) are connected 4 by 4 reinforcement members made of thin plates. The connection point of 5)
is not necessarily limited to the bottom, and the position of the reinforcing member and the form
are shown, for example, in FIG. 1 and FIG. And a book with arranged It is also easily conceivable
to integrally connect the four units. In any case, according to the present invention, it is possible
to prevent the co-grip phenomenon of the speaker in advance by an extremely simple means, and
the acoustic 4I property of the speaker is significantly improved by the suppression of such
resonance. It is needless to say that the additional effect is that the frame structure does not
require any special improvement, such as cost increase, and the reinforcing member can be a
simple sheet metal stamped part or a finished part. It is very advantageous in the aspect of the
production cost, and it is excellent for practical use.
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