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Description 1, title of the invention
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a drone
cone, ie, a passive radiator, of a speaker device which is generally called 7 drone cone type. In a
speaker system, one of closed and phase-reversed enclosures is usually used as a method of
storing a good low-pitched sound. As another method, it is well known that effective use of a
passive radiator (drone cone) to reproduce bass is well known. The present invention relates to
this passive radiator. Although this passive radiator one type is designed in a similar manner to
the phase inversion type blade type, usually the vibration mass of the passive radiator is
designed to be larger than that of the bass speaker (drive speaker). Also, from the viewpoint of
economic, design, commonality, etc., the diaphragm for the bass speaker and the diaphragm of
the passive radiator are almost the same, and in many cases, EndPage: 1. In this case, it is
necessary to adjust the vibration system mass of the noise radiator by some method. As the
method, as shown in FIG. 1, the center portion of the diaphragm (2) is popped 5). There is known
a method of attaching a weight (6) of a metal plate and a method of attaching a weight (7) of a
cylindrical metal ring as shown in FIG. However, the method of FIG. 1 requires an extra bobbin
(5), 7 and the workability of assembly is not very good. Also, in the case of FIG. 2, unnecessary
resonance occurs due to the metal cylindrical ring (7), and the material itself becomes expensive,
and the workability of joining with the diaphragm (2) is not so good. there were. The present
invention relates to a weight for adjusting the vibration system mass to a desired design value in
a passive radiator. That is, the present invention improves the workability of assembly of the tire
bra and the passive radiator using weights made of a material having a specific gravity lower
than that of metal and having relatively rigidity and elasticity, such as synthetic rubber. In order
to improve the performance of The basic structure of the present invention is shown in FIG. 3,
where (1) is a frame, (2) is a diaphragm, (3) is a snorder, (4) is a dust cap, and (8) is a main. The
weight of the invention is shown. The present invention is economical because the weight (8) is
directly adhered to the diaphragm (2) and the spider (3) as shown in the figure, and the extra
bobbin as in the prior art is not necessary. In addition, since the weight (8) is not hollow at the
inner portion but is in a clogged shape, resonance occurring in the hollow portion O2 formed by
the dust cap (4) and the diaphragm (2) hardly occurs. The disadvantages of the illustrated
conventional method can be eliminated.
Next, another important effect of the present invention will be described. The diaphragm of the
passive radiator vibrates due to the excitation of the bass speaker, but the natural vibration
occurs at a specific frequency. Conventionally, this point has been ignored, but suppressing this
natural vibration is extremely effective in improving the sound quality. The present invention
uses an elastic body such as synthetic rubber for the weight (8), so the effect of absorbing and
damping the natural vibration generated in the diaphragm (2) is large, and the sound quality is
superior to that of the conventional passive radiator. Can provide. FIG. 4 is a view showing
another embodiment of the present invention, in which the weight (8a) is provided with a step (9)
at the lower surface position of the spider (3) and the connection portion of the weight. This step
(9) can be provided very simply by using molded articles. According to this method (92, since the
spider (3) and the diaphragm (2) can be attached with the step (2) as a guide, the attachment of
the spider (3) and the & l1lJ plate (2) Positioning is very easy, and the weight can always be
mounted perpendicular to the opening plane of the diaphragm (2). Conventionally, in order to
mount the weight perpendicularly to the diaphragm opening plane, it was difficult to use a
precise jig, but according to the present invention, it can be mounted extremely easily and in a
short time. . FIG. 5 is a view showing still another embodiment of the present invention for the
purpose of improving workability. The position of the lower surface αG of the frame (1) and the
position of the lower surface 0 下面 of the weight (8b) are designed on the same plane.
According to this method, if assembled on a flat work table, it is possible to mass-produce passive
radiators as intended by design without assembling tools. As described above, according to the
present invention, the workability is improved significantly and the performance is improved as
compared with the prior art, with a small number of parts and inexpensive material cost. Can
provide a radiator.
4. Brief description of the drawings. FIG. 1 and FIG. 2 are schematic cross-sectional views
showing an example of a conventional passive radiator, and FIGS. 3, 4 and 5 show the shaft side
to the passive radiator of the present invention. 11 is a schematic cross-sectional view, in which
the symbol (11r + 'suppression) z is a frame, (2) is a diaphragm, (3) is a spider, (4) is a dust cap,
(5) is a bobbin, +81, (8a ), (8b) are weights according to the present invention. EndPage: 2 Note
that the same reference numerals in the figures indicate the same or equivalent parts. 3