JPS57124998

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DESCRIPTION JPS57124998
Description 曽 13 Title of the Invention Thin Speaker 1) A magnetic circuit comprising a plurality
of thin magnetic circuits having two parallel magnetic gaps aligned in a straight line of the
magnetic gaps and arranged in a matrix. , Inserting a rectangular voice coil across the adjacent
linear magnetic gaps of the magnetic circuit and releasing it to a thin speaker formed by bonding
a flat diaphragm to this pois-coy body, the above-mentioned voice coil as the flat diaphragm A
thin speaker based on II #, where an anisotropic flat diaphragm reinforced in the longitudinal
direction is used.
3, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called thin
speaker having a thin drive structure. Conventionally, a movable wire ring type speaker used in 1 Ik ceramic has a structure as shown in FIG. The voice coil bobbin (3) is disposed in the nine sky
11 formed in the dark of the pole piece (11 and the outer plate (2), and the voice coil bobbin
(one conical diaphragm (4) in barrel and damper for holding (- Is provided. However, the speaker
of such a structure has a limit in thinning the whole speaker by the operation that a diaphragm is
conical. The liK conical diaphragm (4) has the disadvantage that it produces many so-called
cavity (cavity) effects Jl due to its conical shape and produces a beak near the midrange in terms
of frequency characteristics. On the other hand, as a typical drive system EndPage: 1 in which a
thin speaker is used, Fig. 2 (a) (gum-thin type) conventionally. And Fig. 2 (b) (electrostatic type)
which has an acoustic conversion system ms (in one gum-thin type, linear magnets facing each
other at the same pole with a narrow gap (6) (6) In the middle of the above, a filiform planar
diaphragm (7) is disposed, and on this diaphragm (7), the voice coil conductors (8)... Are formed
in a serpentine manner by the photoetching method. The latter is the electrostatic type. Similarly,
it is a method of driving a signal (adding a pressure σ 薄膜) thin film to the darkness of a thin 11
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(9) having conductivity in a narrow gap and conductive metal plates on both sides. Although
these systems can be made thin as an electroacoustic transducer, they do not have sufficient
amplitude, so they have low conversion efficiency, high minimum resonance frequency, and
difficulty in producing low frequencies. have. On the other hand, various drive systems and
structures using flat rigid body vibration #Lt have also been proposed for the purpose of, for
example, eliminating the cavity effect and just matching the excitation position 11. However,
some have few driving points, and are not uniformly distributed on the diaphragm, rounding, low
frequency, p-division vibration t 'generation, other, 111 m, especially the structure of the
magnetic circuit ), The whole speaker can not be made thin, such as one. In view of such a defect
Kffi, the present patenter has a thin structure, and the drive S is close to a full drive type (that is,
yo), and a drive type of piston movement over a wide band from low to high Let's propose Sbee jI
on Dec. 9, 5-5, Showa. The present invention is the thin speaker proposed in a) with an INK
improvement, and in particular, it has a special feature on the flat diaphragm used in the thin
Subi iIK.
Hereinafter, the present invention will be described based on the drawings. Fig. S shows a
perspective view of a thin magnetic circuit single-piece (or) according to the present invention. A
top L of a ToL flat square magnet @ is provided with a top-top V-) (for), and a magnet (under)
fmKm On the side plate and on the outer plate Q4 ': a parallel magnetic gear tube 14 is obtained.
Thus, the magnetic circuit single unit (U) has an internal magnetic and square structure. In order
to make the magnet (2) have a thin structure, as shown in this structure, it is preferable to use a
round / helical ferrite magnet which is magnetized in the vertical direction. FIG. 4 shows an
example of the top view of the configuration of the magnetic circuit as the whole of the speaker
and the positional relationship of the voice coil e, ms shown in the figure 9 magnetic circuits
alone Qijj V: 4 rows in the X direction, y direction A total of 12 pieces of 3 lines are arranged on
the base by aligning the magnetic gap @ to the y direction. In the case of a solid, one voice coil
(one) is inserted and arranged one by one in a row of magnetic circuits aligned in the y direction
+: nw (a magnetic gap K is formed by 2Ii pieces). Therefore, in the magnetic circuit of FIG. 4, a
total of four rectangular voice coils (...) are arranged. Each voice coil (瀾 ·-is a wire @ wound
around the lower part of a rectangular voice coil substrate made of resin film or aluminum foil as
shown in Fig. 5) or 94 pieces Voice carp k (to) ... It is connected to a series 4 I (to 4) K through p
(or parallel). The speaker is square in this case. A rectangular voice coil (d) is glued to the lower
part of a square planar diaphragm (d) shown in FIGS. 6 and 7 mm, which is a cross-sectional view
looking at one direction of the nine speakers shown in FIG. The diaphragm (7) is supported by
the damper G in the 9th frame. The speaker pedestal is provided with vents for venting air. In the
embodiment, 6 columns x 4 rows-12 magnetic circuits alone----devices, but the number of
magnetic circuits is not limited to this. Here, the flat diaphragm (d) having the main features of
the present invention will be described in detail. Planar type Sbee II K having the abovementioned structure, its first order high-resonance frequency fr (I is a rectangular voice carp in
the longitudinal length of @ j (m), lateral length t-all (II) と (where l> 瑠), fl is given by the
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following equation. Friend, # is the surface density of the diaphragm (14 / d). D is the flexural
rigidity of the diaphragm (I · 鯛).
Next, when the sF plane diaphragm takes a so-called laminated structure with a core material as
a skin material, its bending stiffness is. EndPage: 2 where t is the thickness of the core material
II). tf is the thickness of the skin material (all). The nail is the elastic modulus in tension of the
surface material (m / g II). Go is the shear modulus of the core material (I / g II). Tw is dependent
on the flexural rigidity of the diaphragm in the longitudinal direction (one direction) of the voice
coil. Therefore, it is necessary that the bending stiffness toward the direction is very hot in the
direction of the direction 69 (while it is relatively hot). Bending stiffness in the horizontal
direction (Cl1ljJ) is large in the longitudinal direction and in the ttui degree ((A good reason,
therefore, as an oscillating plate-as an anisotropic flat diaphragm showing high bending stiffness
only in the longitudinal direction The material is good. As an anisotropic plane diaphragm
material, a nine-cam plate, a fiber reinforced composite material diaphragm, or the like is
effective by using a neccam core. First, as shown in FIG. 8, the necuma core is made by stretching
in the a direction −. In the S direction, the cores are connected in an oblique direction of 45 "@
degree, while in one direction perpendicular to the S direction, there is a portion connected in
parallel. Therefore, the core is a direction perpendicular to the stretching direction (b-direction
has a large bending strength and is a so-called anisotropic material in one direction). In the case
of using late Nemuka coy @ as a core material of a NAND-IDED structure diaphragm, it is
important for the speaker of the above-mentioned drive structure to have a coin for matching the
t direction of the voice coil and one direction of the core. Next, let's think about an example of the
Sbee force that has a flat aim board (the most) constructed by the new Nekam core @. -Lateral
direction III # 4am of the voice coil (2). -Longitudinal direction 1 of voice coil (to) = 56 m. Diamune core (made of 1 luminikum) thickness t 譚 10 shoes of the diaphragm (to). Density po
layer 0-072f! Surface material between the diaphragms (7 kt thickness) thickness% t-4 Qfi war
bow expansion elastic modulus If-7200 # / W "density fitsw 1, 7 f / d · surface density of the
diaphragm (σ) 4" "The shear modulus layer direction of the 0.106 F / -Kinematic honeycomb
core (d) Go-2200 AF /-The direction Go-4500 # / j When substituted for these specific numerical
formulas 00 to N) Nekam core (d) Fym9, 47 KIm, when the one direction of and the longitudinal
direction l of the voice coil are matched. 1)% fIPm-8, 17 KI Ig when the S direction of the necuma
core (mostly) and the lateral direction of @ at the pois car are matched.
Therefore, it is advantageous from the characteristic aspect of the speaker that the direction
perpendicular to the direction of extension of the necumbo 1 and the longitudinal direction l of
the pois carp A / (consecutive) coincide with each other. In addition, it is possible to use
minicumm in 1 as a core core (or other metal materials, or resin materials such as Epotki V
Necom). Further, as the anisotropic diaphragm material, a composite material or the like
reinforced in one direction with high elastic fiber is considered. Specifically, this anisotropic
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composite material is used as a skin material. A nine-layered diaphragm is preferable, using a
core core, a foamed resin or the like as a core material. An example thereof is shown in Fig. 9L,
101gK, where ((転) is an array of boron fibers Gη arranged in one direction as a reinforced
weave, and is a compound of kt nikku complex & /-), 11 This composite M-) (31c! A 7 kt Nikmu
eight Nekam core (d) is placed at 41 m to form a laminated structure. Composite & /-) (Sixth)
using the same one as the one used in the previous embodiment as Alinikum and Nekam core
(Sol), and using a boron fiber @ with a diameter of 60 and a diameter of 60, embedded in
aluminum foil. In the case of military v100 voices, the density of grit (st) is stm 2. Young's
correction in one direction parallel to the length direction of the boron 纏 1 / & @ and 20 × 10
′ ′ II / sr, S perpendicular to the member direction of the boron fiber (9) The Young's modulus
If 'of the direction indicates 5 × 10 ′ ′ I / −. From the above equation (00), when the flat
speaker is combined by combining the flat 1111m moving plate with @ at the same pois cari as
in the previous embodiment. □) When the one direction parallel to the boron fiber (support) is
matched with the longitudinal direction I of the voice coil (至) * fy-IS, oxyt ^ EndPage: 3 鵬)
perpendicular to the boron fiber (b) a Direction and the longitudinal direction l of the voice coil
(d) to run, tW -'- 9, 92 璽 2 °, member of boron fiber (d) and direction of voice coil (d) The
primary resonance frequency fz is higher (lI, which is advantageous as a speaker) when traveling
with the direction matched. Although a combination of boron fiber and aluminum was mentioned
as an example as a skin material, carbon fiber and other high modulus fibers are used instead of
boron fiber, and other metals and resin materials are used instead of aluminum. There will be
471, etc. As apparent from the above description, the present invention uses an anisotropic
diaphragm reinforced in the longitudinal direction of the voice coil as a planar diaphragm driven
by a rectangular voice coil # and is driven by τ, so that the primary resonance frequency of As a
result, the frequency band of the speaker can be broadened, and a flat diaphragm as a full
strength direction (in contrast to the one to be reinforced, the eye can be achieved in only one
direction, so the diaphragm itself The efficiency of the speaker is reduced without much increase
in ttt '!
There is no big burden on cost and cost.
4. Brief description of the drawings 11m, 2 (a) (b) is a cross-sectional view of the existing
speaker, 3 ml is a perspective view of a single magnetic circuit using the Svy lIK of the present
invention, Figure 4 is a speaker of the present invention Aml is a perspective view of a voice coil
using the present invention SvB iIK, FIG. 4 and FIG. 7 each show a cross-sectional view of the
inventive speaker from different directions, and FIG. 8 is the present invention The perspective
view of the principal part of the plane diaphragm used for. 911 is a cross-sectional perspective
view of the main part of another embodiment of the present invention, FIG. 10 is a crosssectional perspective view of a flat diaphragm according to the 111th embodiment, C11I is a
magnetic circuit alone, (d) is a voice coil The symbol は indicates a plane diaphragm, the symbol
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平面 indicates a neccom core, the symbol 複合 indicates a composite sheet, and the symbol @
indicates a boron fiber. Figure 1 Figure 14 EndPage: ４
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