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Description 1, title of the invention
3. Detailed Description of the Invention The present invention relates to a speaker using a
rectangular flat diaphragm, and it is an object of the present invention to provide a speaker
which can expand a reproduction band and is particularly suitable as a speaker for an audio
multiplex television receiver. With the recent adoption of audio multiplex broadcasting, an audio
multiplex television receiver (audio multiplex television) is becoming larger. This is because in an
audio multiplex television, speakers are disposed on both sides of a cathode-ray tube, and
particularly when round speakers are used, there is a drawback that the left and right speaker
parts become large. For this reason, there is also an attempt to make the audio multiplex
television compact by using an elliptical speaker using a paper cone, but with the elliptical
speaker using a paper cone, the rigidity of the diaphragm is low and the sound pressure
frequency is There is a defect that the characteristic is disturbed, and there is also a defect that
the sound pressure frequency characteristic is disturbed due to the front chamber effect by the
concave portion on the front surface of the paper cone. The present invention eliminates the
above-mentioned disadvantages of the prior art, and an embodiment of the present invention will
be described hereinafter. Example 1 As shown in FIG. 1, kraft pulp fibers are formed on both
sides of a core 1 of a foam polystyrene 40 times foam (Dylark (registered trademark): Sekisui
Chemical Co., Ltd.) sliced to a thickness of 5 m and a rectangle of shape 250 × 50 ran. The
surface material 2 and 2 'which consists of F, R, and P (fiber-reinforced plastic thickness 50pm)
which carried out impregnation hardening of the phenol resin is bonded with a rubber-type
adhesive agent is used as a base material. As shown in FIG. 2, an aluminum foil (40 μm) is bent
into a V-shaped cross section to form a reinforcing beam 3, 3 'on the lower surface of the above
base material. It adheres along a direction and it is set as the rectangular flat diaphragm 4. FIG.
The rectangular flat diaphragm 4 is supported by the frame via an edge member, and a coil
bobbin is attached to the center of the lower surface of the rectangular flat diaphragm 4, and the
rectangular flat diaphragm 4 is driven through the coil bobbin. . Example 2> On the lower
surface of the base material as in the actual case 1, as shown in FIG. 4, square pillar-shaped
reinforcing side beams 5, 5 'made of the same foam as the core material 1 are used. A diaphragm
attached along the direction was used. Also in this embodiment, a coil bobbin is attached to the
center of the lower surface of the diaphragm, and the diaphragm is driven via the coil bobbin.
FIG. 5 shows the first and second resonant frequencies of the speaker according to the first and
second embodiments and the conventional flat diaphragm in which the surface material is
attached to both sides of the foam and the material of the foam. It is shown. As apparent from
FIG. 5, according to the first and second embodiments, by providing the reinforcing side beam,
the first and second resonance frequencies become high as a result of the increase in the di-j
characteristics of the diaphragm. , The reproduction band can be expanded.
In the rectangular flat diaphragm, at the first resonance frequency, as shown by a broken line in
FIG. 1, the rectangular flat plate-diaphragm is divided into substantially three parts in the
longitudinal direction. t2 ° occurs. These two clauses 1. . When 12 is driven, the first resonance
mode does not occur, and the reproduction band is expanded to the second resonance frequency,
and the driving method may be selected according to the necessary reproduction band. Although
the above-described first and second embodiments are examples in which the foam is used as the
weir, the present invention is also applied to a speaker using a rectangular flat diaphragm made
of aluminum foil and having a large number of hexagonal cells. The regeneration zone can be
expanded by providing the reinforcing side beams similar to the first and second embodiments.
In addition, when the method of manufacturing the core material is compared, the method of
manufacturing the honeycomb core material is complicated and the manufacturing cost is high,
while the core material made of the foam has an advantage of mass production at low cost. In the
first and second embodiments, two reinforcing side beams are used, but the number of
reinforcing side beams is not limited to two, and may be one or three or one, and the shape of the
reinforcing side beams may also be the above embodiment. The present invention is not limited
to the shape of the example, and the same effect can be obtained with a semicircular shape, a
triangular 9 trapezoidal shape or the like. The present invention is configured as described
above, and according to the present invention, a speaker using a rectangular XF diaphragm can
expand the reproduction band with a simple structure, and particularly provides a speaker most
suitable for audio multiplex television. It is possible.
4. Brief description of the drawings. FIG. 1 is a perspective view of a rectangular flat diaphragm
of a speaker according to an embodiment of the present invention. FIG. 2 is a perspective view of
a reinforcing side beam used for the rectangular flat diaphragm. 8 is a perspective view 2 of a
rectangular flat diaphragm of a speaker according to another embodiment of the present
invention, FIG. 4 is a perspective view of a supplementary to strong beam used for the same
rectangular flat diaphragm, and FIG. It is a figure which shows the relationship between the
diaphragm shape of the conventional speaker, and a 1st resonance frequency and a 2nd
resonance frequency. 1 · · · heart material, 2, 2 · · · · · · · surface material, 3, 3 · · · · reinforcement
side beam, 4 · · · rectangular plate diaphragm, 5, 5 '· · reinforcement side beam . Name of agent
Attorney Nakao et al. 1 person EndPage: 2 Fig. 1 2 2 Fig. 2 Fig. 3 Fig. 4 EndPage: 3
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