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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
multiple drive type flat loudspeaker having a plurality of voice coils attached to a common drive
cone. 2. Description of the Related Art Conventionally, as shown in FIG. 4, FIG. 5 and FIG. 6, this
type of multiple drive system flat loudspeakers have the same number of drive drives for a
plurality of voice coils (7a) and (7a). The cones (8a) and (8a) are attached to each and attached to
one flat diaphragm (5). Therefore, in the conventional oval-shaped multi-drive type speaker of
this type, the voice coils (7a), (7a) and the drive cones (8a), are provided for each drive point.
Since the structure (8a) and the dampers (9), (9) etc. are provided, the drive coils (8a), (8a) for
driving each of the voice coils (7a), (7a) during assembly manufacture. ) Are coaxially combined
and attached, and each semi-finished product is attached to the plate diaphragm (5) one by one,
to the magnetic pole wall of the magnetic gap (1g), (1g) of the magnetic circuit (1), (1) As it was
attached coaxially so as not to touch it, not only does it require the same number of operation
steps as assembling a normal speaker as many as the number of driving points although it is a
single speaker as well as complex jigs and tools There is a problem that it is necessary and
requires a lot of handling and processing time. In the above conventional example, the upper
ends of the voice coil bobbins (7b) and (7b) are not in direct contact with the lower surface of the
diaphragm (5). The other prior art shown in FIG. 6 is the same as the other one shown in FIG. 4
except that the upper end of the voice coil bobbin (7b) protrudes to the front of the diaphragm
(5). . Therefore, in order to solve the problems of such a conventional multiple drive system flat
loudspeaker, the present invention provides a single flat diaphragm (5) with a plurality of driving
voice coils (7a), It is an object of the present invention to provide a flat type speaker aiming at
shortening of assembling time and reduction of man-hours by attaching (7a) and making the
drive cone (8) common. The configuration of the present invention for achieving the object will
be described with reference to FIGS. 1 and 2 corresponding to the embodiments. The present
invention comprises a plurality of driving voice coils (7a). ) And (7a) are mounted on a common
drive cone (8). Since the present invention has such a structure, the drive part is integrated and
the number of parts is reduced, so that the assembling time is shortened and the same as the
conventional speaker having one drive part. By being able to assemble according to the
procedure, the number of man-hours can be reduced.
invention will be described below with reference to the drawings. 1 and 2 show an oblong
speaker as one embodiment of the present invention, and FIG. 1 shows a cross section along the
longitudinal center line, and FIG. 2 shows the same. It is a figure showing the plane which
partially cut away. This is a multiple drive system flat speaker having a structure in which a
plurality of drive voice coils (7a) and (7a) are attached to a common drive cone (8) in a multiple
drive system flat speaker. Thus, on the magnet (2) placed on the lower plate (1b) of the center
pole (1a), between the center pole (1a) and the inner wall of the central hole of the upper plate
(3) The voice coil (7a) wound around the voice coil bobbin (7b) is suspended in the magnetic gap
formed in the and is supported by the damper (9). Bonded to the tip end of the cone of the drive
cone (8) on the tip of the voice coil bobbin (7b), (7b) of the speaker unit (1), (1) of such
configuration Then, the tip is adhered and attached to the lower surface of a flat diaphragm (5)
whose periphery is attached and fixed to a frame (4) via an edge (6). FIG. 3 is a cross-sectional
view showing a cross-section of another embodiment, in which the tips of the voice coil bobbins
(7b) and ('b) are protruded and bonded to the surface through the diaphragm (5). Except for the
above, it has the same structure as that of FIG. Although the embodiments considered to be
representative of the present invention have been described above, the present invention is not
necessarily limited to only the structure of these embodiments, and includes the above-described
components according to the present invention, and In order to achieve the purpose mentioned
above, the present invention can be suitably modified and implemented within the range having
the effects mentioned below. As is apparent from the above description, the present invention, as
shown in FIGS. 1 to 3, comprises a plurality of drive voice coils (7a) and (7a) in one common
drive cone (common). 8) Because it is a flat-type speaker of the multiple drive system attached to
the structure, the number of parts is smaller compared to the conventional example, and
vibration centered on the units (1) and (1) of the vibration system and the frame The mechanical
part to which the plate (5) is attached can be manufactured separately at another place, and they
can be combined and completed as needed, and the bonding process can be simplified. It has
come to be expected that the practical effect of shortening the assembly time and reducing the
number of man-hours can be expected.
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