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The speaker 1 of the present invention, a vibrating pole, a voice coil for driving the vibrating
plate, and a virtual plane which is formed substantially symmetrically with respect to a virtual
plane perpendicular to the moving direction of the voice coil and connected to the vibrating plate
A speaker comprising: an edge portion as described above; and an edge receiving portion having
a concave shape substantially similar to the edge portion and forming a constant gap C between
the edge portions.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to loudspeakers, and
more particularly to so-called edgeless loudspeakers that do not use materials for the
loudspeaker edges. Usually, the speaker has an edge made of paper, cloth, synthetic material or
the like which is made of the same material as or different from the material of the amplitude j
and the plate for supporting the vibration reduction plate 11. However, the edge material has the
unique property of the material, and the effect of the property is not desirable because it appears
in the regeneration characteristics. Moreover, in order to reproduce the signal change accurately,
it is preferable not to intervene the edge using the material because the absorption loss due to
the edge is considerable. However, a so-called edgeless speaker via air is desirable.
Conventionally, the edge of an edgeless speaker is as shown in FIG. That is, the vibration & 10
has a conical EndPage: 1 cone portion called 1. A frame portion comprising Oa and a peripheral
portion 10b having a constant angular variation α, facing the peripheral portion 10b, and
having a fixed gap 12. Position 11 minutes. At this time, the gap 12 is called a so-called acoustic
low-pass filter, and has a role similar to that of the duct of the bass reflex type speaker. In other
words, the active circulation of air accompanying the vibration of the diaphragm 10 is achieved
(from the second point, the lowest resonance frequency of the speaker can be lowered. X11
Various conventional t-structures (If using a bus-less speaker box, the acoustic impedance of the
duct (compared to: can be ignored, so there is a problem with air flow around the edge You do
not have to However, i5. The intermediate i acts in the same manner as the bass reflex duct as
described above. Therefore, when it is not desirable to make the air flow in the gap (= fJ
extremely in the gap (2 is inconvenient). That is, the conventional edgeless speaker does not
support the edge of the normal speaker by the air resistance) 2, and leaves the support only to
the damper portion. This invention is accomplished based on the above-mentioned actual
situation, and it has an effect similar to that of the edgeless one and the closed type (-both in the
case of the inset and in the bass reflex type) merely by eliminating the illusion caused by the
substance. The purpose is to provide a speaker. In order to achieve this object, according to the
present invention (more preferably, the diaphragm and the voice coil for driving the vibrator J 枡,
the bending formation substantially symmetrical with respect to the virtual plane perpendicular
to the movement direction of the voice coil And an edge receiving portion which has a shape
similar to that of the edge portion and which forms a fixed gap between the edge portion
surfaces. Let me know.
Hereinafter, the present invention will be described in detail according to the attached drawings.
FIG. 2 shows a speaker 200 which is an embodiment of the present invention. The speaker 200
includes a diaphragm 210, an edge receiving portion 220, a voice coil 230, an electric circuit
240, braking means 250a and 250b, and a frame 260. The vibration plate 210 is, for example, a
plane vibration (3) ridge of a honeycomb structure, and a skin 212% such as an aluminum foil
provided on an upper portion of the honeycomb core 2J1 and the core 211 a sheet 213 is
stretched. The peripheral portion 214 of the selection qlh 枡 210 is a so-called edge portion, and
the movement direction of the voice coil 230 is a one-hundred 伽 iυ plane (a pair of rectangular
planes in the plane of the drawing including the case mark B) 5, extend at the end of the
diaphragm 210. This edge portion 214 is formed by bending a sheet of flat tape with its 11 cores
[, the peripheral portion 214 of the diaphragm 210 (may be wound twice, and one or both of the
skin 212 and the sheet 213 may be bent You may form. D + (-1 this edge portion 214 may be
formed by springing a forming member having a triangular shape in cross section (-. The
diaphragm 210 may have any shape such as a square or a rectangle and a circle, and the
materials for forming the diaphragm may be those of each village. In addition, will you illustrate
honeycomb structure? As shown in FIG. 1 and FIG. 4, a series of hexagonal honeycomb cores 211
which are connected with each other are drawn in with a skin 212 (third [tl]). (4) A bottom
portion is formed together with the triangular honeycomb core 211, and the upper portion (:
only the skin 2) 2 is stretched (fourth di 1). Shake like this! The iv1 plate 210 is disposed
opposite to the edge receiving portion 220 via the gap 219. The edge receiving portion 220 is a
ring-shaped portion having a recessed portion of substantially the same shape as the edge
portion 214. The edge receiving portion 220 is divided into a lower ring 22 and an upper ring
222, and after the frame 260 (two ends, the lower ring 221 is fixed and the diaphragm 210 is
disposed at a predetermined position, the upper ring 222 is 221 and fixed to the frame 260 in
combination. (2) The diaphragm 210 is capable of traveling 1φ with a stroke determined by the
inclination angles of the edge portion 214 and the edge receiving portion 220 and the size of nfl
@ 219. The surface and the edge receiving portion 220 can be made of any material such as
plastic and metal. The Fleno 260 having the edge receiving part 220 fixed thereto has a flange
portion 261 and several through holes 262.
The holes 262 are for fixing the speaker 200 to a buckle plate (not shown). Frame EndPage: 2frame 260 has an opening for lightening and air-tightening as usual. The frame 260 itself is fixed
to the magnetic circuit 230 with a bottom surface 263 having an opening 264. The magnetic-1
path 230 comprises a ring-shaped permanent magnet 231, a first yoke 232 co-supporting the
magnet 231, and a ring-shaped second yoke 234 disposed above the magnet 231. The first yoke
232 has a one-and-five-plane flat portion 232a, and a cylindrical portion 232b rising at the
center of the flat portion 232a. The center of the cylindrical portion 232b (-is provided with an
inner (: facing trumpet-shaped w through hole 233). The inner end 232 c of the cylindrical
portion 232 b is flanged and forms a magnetic gap 235 with the ring-shaped second yoke 234.
The frame 260 is fixed to the second yoke 234. In the magnetic gear tube 235 (-, a coil bobbin
241 (a double-wound voice coil 240 is inserted. The coil bobbin 241 has an opening 242 for
digitizing and air-tightening. The end of the coil bobbin 241 opposite to the voice coil 240 is
fixed to the diaphragm 210. In the middle of the coil bobbin 241, a damper 250a. 250b is
provided. The dampers 250a and 2'50b are made of an extremely small amount of hysteresis and
loss such as a thin plate of the button 1, for example, and the number of supporting points of the
coil bobbin 241 is a prime number. Detailed to Sho 53-113523). In this regard, conventional
dampers usually have very high losses. The dampers 250a, 25 + lb are fixed to the frame 260
through an insulating member, and the fixed position causes the diaphragm 210 to settle or
settle. Since the dampers 250a and 250b are configured as described above, they can be used as
an extraction voice path of the C nihos cary A / 240 as shown in the drawing, and are connected
to an amplifier (not shown) terminal with a terminal 252, for example. The operation of the
speaker having the above-described structure (the e in FIG. 5 described next shows the
diaphragm 210 and the edge receiving portion 220 of the above embodiment, and the
diaphragm 210 shown by the dotted line is stationary) It is a state. Now, in the closed box (: the
voice coil of the arranged speaker, current flows t'l vibration rod 210 moves forward like a
meridian, at this time, edge 214 and edge receiving portion 220 (!: In the gap 219, the gap near
the part 2 9a becomes narrower than in the stationary state, and the air pressure rises.
This (in contrast, the gap near the portion 219b is wider than at rest, and the air pressure
decreases. Of course, at this time, the air pressure of the front surface portion 502 of the
diaphragm 210 increases, and the air pressure of the rear surface portion 501 decreases.
However, the pressure gradient with respect to the portion 502 of the portion 219a and the
pressure gradient with respect to the portion 219b + two make the gap 219 narrower by a
certain degree or more (so that the latter can be made much larger by 1 :). in this case,? Most of
the air in 1 lj E 219 flows inward, and the air in the gap 219 hardly flows out. Conversely, when
the diaphragm 210 moves to the side D ', the air pressure near the portion 219b increases and
the air pressure near the one portion 219a decreases. At this time, the air pressure of the front
surface portion 502 is decreased 2 and the air pressure of the rear surface portion 501 is
increased. Accordingly, in the gap 219, air flows from near the portion 2] 9b toward near the
portion 219a. Meanwhile, outside (1j1 '. The air is also directed near the portion 219a, but the
pressure is appropriate (diversely, there is almost no chance that the outside air flows into the
gap 219). As described above, by appropriately balancing the pressure gradient in the gap 219
with the surrounding pressure gradient, the air entering and leaving the gap 2] 9 should be such
that it can be packaged at first. The diaphragm is supported by air as it is. In the above
embodiments, a speaker having a honeycomb plate and a plane and a four-plate moving plate (a
two-piece loudspeaker is used, but the present invention is also applied to a cone-shaped or other
speaker with or without a honeycomb triI structure) Of course it is possible. According to the
present invention, by configuring as described above, it is possible to minimize the loss due to
the edge, and to provide a speaker that is highly responsive to changes and can reproduce with
high fidelity. EndPage: 3
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a conventional speaker
edge, FIG. 2 is a partial sectional view of an embodiment of the present invention, and FIGS. 3
and 4 are views of an embodiment of the present invention. FIG. 5 is a detailed explanatory view
of a part, and FIG. 2. 0: Diaphragm, 214: Edge part, 220: Edge receiving part, 230: Magnetic
circuit, 240: Voice coil, 250a, 2sob, -I + 1 moving member, 260. ··flame. Applicant agent 消 消 11
葺 (11) δ 4-葺 4 \ EndPage: 4 procedure amendments Showa 5th month / Q day Patent Office
Secretary Nobuo Kawahara 1 indication of the case Showa Patent No. 59408 2, Title of the
invention 2, Name of the invention sound conversion device 3, Related patent applicants with the
person making correction case
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