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Industrial application: The present invention maintains a substantially frusto-conical cone paper
shape, and uses a flat or substantially flat surface material fixed to the +11 j surface as a
diaphragm of a cane-peel structure to increase the rigidity of the diaphragm. In addition, the
present invention relates to a flat speaker which is used in a flat diaphragm in which reduction in
weight of one flat diaphragm and reduction in cost of the flat speaker are achieved. The structure
of the conventional example and its problems The vibration of the speaker! The gIJ plate is ideal
for piston vibration over the internal wave number band used, and if the diaphragm is deformed
during vibration or split vibration occurs, the sound pressure frequency characteristics, distortion
factor 1 phase characteristics, etc. are degraded, and high fidelity It will be a hindrance to
regeneration. In order to solve these problems, a planar vibration mJ plate using a honeycomb
sandwich structure has recently been adopted. Also, in many flat speakers, so-called node drive,
in which the driving force is applied to the joint portion at the primary resonance frequency of
the diaphragm with an inverted conical cone-shaped transmission member, to raise the IQ raw
band to near the second resonance frequency. The method is used. In addition to the reverse
cone-shaped transmission member corresponding to the conventional cone paper, the vibration
? plate of such a flat speaker is added with the P plate of the nick of the nikham sand inochi
figure, and the J plate is added The problem is that the weight I11 is significantly increased
compared to cone paper, and that the cost is high due to a drop in the pressure level, which is the
main performance of the speaker, or the adoption of a strong field section. It is ?-). Here, in
order to reduce the weight, a lightweight planar vibration handle of a cananope structure having
a substantially frusto-conical cone paper shape and a flat or substantially flat surface material
fixed to the front is shown. Since the radial V-shaped groove and the circumferential V-shaped
groove cross their valley lines, the strength around the diaphragm bending upward is weak, and
there is a problem such as generation of dips in the midrange The A conventional flat
loudspeaker will be described below. 1 (a) and 1 (b) are diagrams showing a circular flat
diaphragm and a voice coil which are main parts of a conventional flat speaker, and FIG. 1 (a) Vi
is a partially cut away front circular thin plate FIG. 2 (bl shows the half sectional view). In FIG. 1,
reference numeral 1 denotes a voice coil bobbin around which a voice coil 2 is wound. Reference
numeral 12 denotes a transmission member for transmitting a driving force, and the
configuration thereof is as follows. That is, a gap is provided on the radial generatrices 3 of the
cone paper in the substantially inverted frusto-conical shape to form concentric circles 4a, 4b, 4c,
4d, and V-filling sa opened upward as a valley line. Provide sb, sc, sd. Further, the bus bar is a
valley line, and a radially extending ? form fM 7a, 7b which extends upward to the voice coil
fixing portion 6 and a radial ? form groove 8a ... which extends to any concentric circle on the
inner diameter side. For example, type 1
Here, the above-mentioned articles 9a, 9b, ... are formed between the radial V-shaped f 114 and
the circumferential n-shaped groove. There is a substantially inverted conical wall 1o opened
upward from the central voice voice coil anchorage 6. The transmission member is composed of
two elements, and the material is, for example, a paper, an olefin-based material of carbon fibercontaining i, or the like. It is a circular thin plate made of the same material or aluminum as the
111 "i transmission portion J4, and is fixed to the flat portion of the transmission member and
the two end faces of the voice coil bobbin. The following IJJ describes the operation of the
conventional flat loudspeaker configured as follows. As shown in FIG. 1, the valley line of the
radial V-shaped groove and the valley line of the n-shaped groove in the circumferential direction
intersect the Lz upper line of the cone paper having a substantially inverted frusto-conical shape
as shown in FIG. The bending rigidity of the diaphragm is "nide asymmetry" because the surface
material is attached to the peripheral flat portion. That is, when the diaphragm is bent in a
chevron shape, a force to open the? Shape II 4 acts, and in a reverse chevron shape, a force to
close the? Shape groove acts. However, the surface material exerts a resistance against the force
of opening the V-shaped groove, but against the force of closing the V-shaped groove, the surface
4A is bent and shaken! 1IIJ plate will be broken at the valley line of ? n form t 8 of
circumferential direction. As a result, there is a problem that dips occur in the middle region on
the sound pressure frequency characteristics. SUMMARY OF THE INVENTION In view of the
conventional problems, the object of the present invention is to provide a flat loudspeaker which
enhances the rigidity of the diaphragm to expand the piston area and lowers the cost. The
present invention FJi has a plurality of first grooves disposed in the circumferential direction
from the outermost periphery to the voice coil bobbin fixing portion, and 1) a depth greater than
the first groove and the first groove And a flat portion formed between a plurality of radially
adjacent second grooves and a plurality of adjacent first and second grooves, + jiJ voice coil
bobbin The driving force transmission section (A and IjFJ fixed on the flat city) lL surface
vibration! A flat speaker with a configuration including a 1IIJ plate. The rigidity of the diaphragm
is increased to 11?b to increase the piston area, and the weight of the vibration system is
reduced to improve the sound pressure level or lower the flat speaker. It is aimed at costing. 2 (a)
and 2 (b) show a circular flat diaphragm and a voice coil portion which are one retaining portion
of the flat speaker in the first embodiment of the ij tree failure J1; Fig. (A) iJ: the top view of a
circular thin plate with a surface jrjU surface, Fig. 2 (bl shows the same half side sectional view).
About Figure 2 below-H? The same reference numerals will be assigned to the layers, and the
explanation 13) will be omitted. Referring to FIG. 2, the transmitting member for transmitting the
driving force 130 "i has the following configuration. That is, with the generally reverse
frustoconical cone paper diameter direction generating bus line 14 as a valley line, open upward
to the voice coil fixing portion; A plurality of grooves 15a are provided in the circumferential
direction. Further, concentric V-shaped grooves 17a to 17d are formed, which intersect threedimensionally with the diameter-direction groove 11 and the groove. Here, flat portions 18a-18d
are formed between the two V-shaped grooves. The central part has a frusto-conical side wall 19
which opens upwards from the voice coil attachment and is smoothly joined to the radial Vshaped groove. As described above, the transmission member is configured, and paper, an olefinbased material containing carbon fiber, and the like can be considered as the matrix. Reference
numeral 11 denotes a circular thin plate made of the same material as that of the transmission
member 13 or made of aluminum, and fixed to the flat portion of the transmission member and
the upper end surface of the voice coil bobbin. The operation of the flat loudspeaker of the first
embodiment configured as described above will be described below. As shown in FIG. 2, the
plane diaphragm has a two-layer structure of V-shaped grooves i), so-called cane and beak
structure, and further, radial -shaped grooves and V-shaped tM in the circumferential direction
are three-dimensional. Since the radial direction V-shaped groove is formed in the lower part of
the circumferential V-shaped groove intersecting with the above, the rigidity against the upper
and lower curvatures of the diaphragm can be enhanced. The weight of the vibrating plate is
about 1.6 to 1.8 times as large as that of the conventional cone paper, but it is reduced to 11 as
large as the vibrating plate of the aluminum honeycomb solar cells. As described above,
according to the present embodiment, a plurality of radial V-shaped grooves along the
conventional cone paper generatrix and a shallow concentric n-shaped groove threedimensionally intersecting with the radial direction V-shaped tM are used. The rigidity can be
gathered by the driving force transmission member having a light weight and the light weight
vibration plate of a cananobe structure in which a flat thin plate is fixed to the 10 faces, thereby
expanding the piston area and a flat speaker achieving cost reduction. . Next, a second
embodiment of the present invention will be described below. FIG. 3 shows a flat speaker
according to a second embodiment of the present invention 'J1; FIG. 3 ia) is a cutaway plan view
of the same part, and FIG. The following explanation about Fig. 3]! 11, but the same parts as in
FIG. In this embodiment, the annular thin plate 2o is fixed to the flat surface of the + i + 7 plane
of the transmission member 13 described above, and the inner hole thereof conforms to the
upper end diameter of the substantially frusto-conical side wall portion of n.
A dome-like thin plate 21 has a fixing portion 24 fixed to the inner hole and the conical side wall
portion and the rim portion 22 and the dome portion 23 and the annular thin plate 20. It is not
in contact with the upper end portion of the voice coil bobbin 26. The configuration of this
embodiment is to raise the strength at the central portion of the diaphragm at the edge ii 122 of
the dome-like thin plate 2 and is not contrary to the intention of the first embodiment. Next, an
embodiment of FIG. 3 will be described with reference to FIG. The dome-shaped thin plate 27 is
inserted into and fixed to the upper end of the voice coil bobbin 26, and the inner periphery of
the annular thin plate 28 described in the second embodiment is fixed to one end thereof. This
embodiment is not contrary to the intention of the first embodiment. Although each of the above
embodiments has been described with reference to the circular flat diaphragm, it may be
implemented by a substantially square flat diaphragm. Furthermore, in each of the embodiments,
the substantially U-shaped groove and the one substantially inverted trapezoidal shape im may
be used. In the case of an F ? surface speaker having a diaphragm having a two-layer structure,
the first flat portion formed in the circumferential direction and the substantially inverted head
opened upward are used. Since the driving force transmitting portion including the conical side
wall 111 and the planar diaphragm fixed to the above-mentioned product are provided, the
rigidity of the diaphragm is enhanced, the reproduction zone is expanded, and the plane
vibration is generated. It is possible to realize a flat panel speaker having a circular flat
diaphragm which can reduce the weight and cost of the mJ plate.
Brief description of the drawings
1 (a), (bl is a block diagram of the main part of a conventional flat speaker, FIG. 2 (a), (b) Vi is a
block diagram of a flat speaker according to the first embodiment of the present invention, FIG.
(A), ((bl is a block diagram of the half-speaker in the second embodiment, FIG. 4 (, 1, (bl is a block
diagram of the flat-speaker in the third embodiment)
13 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии 18 иииииииииииииииииииииииииииииииииииии x x ..... frusto-conical
side wall. Name of Agent Attorney Nakao Toshio and 1 other person 11A2 Figure 3 Figure 4
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