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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway perspective view showing a speaker
using a conventional foam diaphragm, and FIGS. 2a and 2b are detailed views showing the
diaphragm portion of FIG. FIG. 3 is a cutaway perspective view of the main part showing one
embodiment of the speaker diaphragm according to the present invention. · 21 · · · first foam,
211 ...... sound radiating surface, 212 ...... protrusions 22 ...... second bubble loss, 221 - .........
The present invention relates to a loudspeaker, and more particularly to the improvement of a
diaphragm using foam. Recently, in order to expand the piston operating voltage range in
speakers, a foam was used instead of the one using corn paper in the US as the vibrating plate
material, and a foam was firstly developed. It is done. That is, tl is, for example, a convex surface
1--927 · / 2. 5, 5 / ', と and b-shaped squealish flat-shaped sound radiation surface so that the
rear surface continuously decreases in thickness in the radial direction from the central portion
to the peripheral portion, substantially in 4 Ti 4 A V-shaped cross section with one end placed on
the tip peripheral edge of the foam diaphragm 11 formed in the shape of a letter, which radiates
written information. Supported at the end of the pot-like frame 130 via the support 12 and the
same? The base end portion connected to the chair coil 14 is supported by the bottom of the
frame 13 via a dan 4- 15. In this case, the I chair coil 14 is disposed in the action magnetic field
by the magnet 161 provided at the bottom of the frame 13, the meter 162 and the magnetic
circuit J6 defined by the ball bean 163. And then on [i [! The foam diaphragm 11 is required to
have a high strength in consideration of as much expansion of the piston movement area as
possible, and as much as possible of the support structure including the edge member 12, the
voice coil 14 and the Danno f-15. As shown in FIG. 2 ta + and tbl, it is possible to combine the
two parts formed in advance as shown in FIG. That is, the cross section 2-28 is formed of a foam,
and the cross section is formed in the shape of an inset. Similarly, the foam is formed in a
substantially truncated cone shape of a cross section to the large circle 1i11 It will be a beast 6
That is, since the diaphragm made of a single foam has low rigidity and a narrow piston
operation region, reverse resonance is likely to occur at a relatively low frequency. By the way, in
the case where the above-mentioned structure t is made into a 11ll--like structure in which the
adult diaphragm titDif * radiation aiJito is projected outward to the object Kij, one end 111 of the
machining member 12 is provided with a slope according to it. vC). It is necessary to remove
unwanted distortion that occurs in the diaphragm 11 at the time of attachment. However,
providing a slope at one end of the work piece 12 in this manner makes it extremely difficult to
make it eight folds, so it is impossible to avoid the high cost as a whole. If the construction is
such that the work member 12 is placed on the diaphragm 11, the thickness of the diaphragm
11 in the relevant part exhibits a dent effect in place of sound, so it is possible to reduce the
frequency% characteristics accordingly. It is a disadvantage that it is easy to cause this problem.
Furthermore, in this case, 4kllJJ 叡 11 which is not a foam in this case looks like a joint from its
outer surface, so the appearance appearance is impaired, and a density discontinuity exists in the
middle diameter direction. It left the cause of the undesired division vibration. Therefore, the
present invention is based on the point Km as described above, and in the construction in which
two foams are joined, in particular, the frame supporting echo member is held between the two
foams K Further, it is an object of the present invention to provide a loudspeaker diaphragm
which is improved to be able to contribute to as much improvement as possible, such as
circumferential stiffness and the like, with a simple configuration and that fc is extremely good.
One embodiment of this examination will be described below with reference to the drawings.
That is, as shown in FIG. 3, for example, the # 1 'i' first foam 2 having extra denseness has
acoustic radiation th21 at the front end and projection &! At the rear end. It has 212 and it is
formed in I11 music approximately T-shaped. In this case, 1t 41 radiation 4-30-; 1i 991. ), 151,
□, 1 key. □(c! O B7i1ii11i, -〇, □ both Engineering from the center, and include at JiYuzai
(2)) to the periphery sufficient to sandwiched between the foam 22 of gauze 2 tR predicates. In
addition, the projecting portion 212 is located at the center of the back of the sound emitting
surface 211 and protrudes on a force surface substantially crossing the sound emitting surface
211 or has a slight inclination at its If root portion It is accompanied by. Then, for example, 1
(sufficient size) for holding the eno member (2) between the second foam 21 Fi @ V and the first
foam 21 having a low polarity and the fC paper portion is the above-mentioned second At the
back of the foam 21 of 1-having a hole 221 for fitting the projecting crest 212, it is possible to
join and at the top it is formed into a truncated cone shape by passing sit * m 22J of I chair coil .
It is to be noted that a frame, an I dog coil, a Dan 9-1 magnetic circuit, etc., which are not shown,
are made substantially the same as in FIG. Here, the first and m20 foams 21 ° 22 are joined
together to form a speaker diaphragm 23, but the second foam 22 is made in advance and the
bottom portion thereof is used. Through the Esso member (to) and against the top of the die coil
attachment 222 and on the frame through the Dan-don! (1) After the first foam body 21 is
attached to the first foam body 21 using an appropriate adhesive or the like, the first foam body
21 is joined in order, and the support structure as the whole of the speaker can be easily formed.
, Loudspeaker diaphragm of the above example! In the case of using -7 as a diaphragm material,
it is necessary to divide it into two parts in advance and combine the running gutters. In the prior
art of the pole it is possible to reliably and completely eliminate the disadvantages.
That is, since the acoustic radiation 1il 1211 is formed only by the foam 21 of the weir, from the
center to the front end of it, from the center to the peripheral part to be deposited on the frame
supporting tool and the no-member (2)) The point at which the joint with the second foam 22
does not appear in the outer surface direction, and the appearance 6-; "can be finished without
any loss in appearance. In addition, the discontinuity of the density due to the junction of the
protrusion 212 of the first foam 21 and the hole 221 of the second foam 22 is in the radial
direction such that the discontinuous surface of the density is in the direction substantially
perpendicular to the driving force, that is, the acoustic radiation 18ii 211. And the reinforcement
effect of suppressing the occurrence of undesired four-part vibration as a whole of the
diaphragm L co, thereby contributing to the expansion of the piston movement region. It is. And,
in particular, since the edge member @) is supported in a sandwiching manner between the
bonding peripheral portions of the first and twentieth foams 21 and 22 constituting the
diaphragm 23, it is possible to mount the edge member (G) Can be substantially coplanar with
the holding portions of the first and second foams 21 and 22 without providing a slope, thereby
reducing the cost of the machining member CEl itself and its deposition operation ' The cost can
be reduced by simplification, and the overall cost of L can be significantly reduced. In the case of
the case size, the edge member (5) in the case of the grain is sandwiched and supported by the
second foam 21.21 and the wIJl constituting the moving plate 23 of the scissors 7-ha. The
advantage is that it is possible to increase the support ** between the work, the ZO member @)
and the diaphragm 23 accordingly. Furthermore, since the effective thickness of the relevant
portion of the diaphragm 230 seen from the side of the work and the member (5) can be halved
from that of the conventional one, the acoustic dent effect is reduced and thus the frequency
characteristic is disturbed. The advantage is that it is possible to improve as much as possible.
Incidentally, the present invention is not limited to the above-described and illustrated fc
practical examples, and it is needless to say that extreme modification or generalization can be
performed with 11 functions without departing from the scope of the present invention. For
example, in the case where the acoustic radiation surface is frustrated, it is necessary to hold the
working member between the first and second foams, and hold the hF! The second effect
described above can be achieved. Therefore, as described in detail above, according to the
present invention, in the structure t to which the two foams are fitted, the work for supporting
the special & C frame, the two members are the two foams 8-34 ^, v4 ° By having the
configuration of being held between 71, it is possible to provide an extremely excellent
loudspeaker diaphragm improved so as to contribute as much as possible to the frequency
characteristics etc. as much as possible with a simple configuration.