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JPS5556098

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DESCRIPTION JPS5556098
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural schematic view showing an
example of a conventional electrodynamic direct emission speaker as a background of the
present invention. FIG. 2 is a diagram showing an example of frequency characteristics of the
loudspeaker shown in FIG. FIG. 3 is a perspective view showing a preferred embodiment of the
present invention, FIG. 4 is a side view excluding the magnetic circuit of FIG. 3, and FIG. 5 is a
voice coil motion direction showing the shape of a voice coil. It is an illustration figure which
shows a cross section perpendicular ¦ vertical to. 6A to 6E are diagrams for explaining the effect
of this corrugation. FIGS. 18 to 1C are schematic diagrams showing waveforms applied
respectively. FIG. 8 is an illustrative view showing a state of the voice coil frame 106 supported
by the support wire 108. As shown in FIG. FIGS. 9 to 9C are diagrams for explaining the restoring
force exerted on the voice coil (cone) by the support wire 108 respectively. FIG. 10 is a structural
perspective view showing another embodiment of the present invention. FIG. 11 is an illustrative
view showing another shape of the voice coil used in the present invention. Fig. 10 shows a
frame 101, a frame 102, a yoke 103, a magnet 104, a ball 105, a voice 105. indicating coil, 106
...... voice coil frame, 107 ...... corn, 108 ...... support line, the 113 ...... adhesive or joints.
The present invention relates to a loudspeaker, and more particularly to an electrodynamic direct
emission loudspeaker having an improved voice coil (voice coil frame). FIG. 1 is a general
structural view showing an example of an electrodynamic direct emission speaker as a
background of the present invention. A frame 1 for supporting a cone 7, a yoke 2 provided at the
rear end of the frame 1 to form a magnetic circuit II &, and a magnet 8 for applying magnetism
to the yoke 2, as well known to the structure company; And a pole number connected to the
magnet 8 and having its tip inserted into the opening of the yoke 2. The edge of the cone 7 is
supported by the edge 9 so as to be movable by the frame IKJI, and the other end of the cone 7 is
connected to the voice coil 6 wound around the coil frame 6. The coil frame, i.e., the voice coil, is
supported by the damper 8 on the frame l so as to be correctly positioned at the open end of the
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yoke 3 and the pole assembly. And, lO is a cap, 11 is a terminal, and 18 is a lead wire. 儲) The
frequency characteristics of this higher speaker are shown in FIG. In FIG. 2, A is a region below
the lowest resonance frequency fo of the speaker, B is a region in which the response is almost
flat, and C is a region in which the cone splits and vibrates. And, in such a speaker characteristic,
it is desirable that the region B be spread over a wider frequency range. And in order for the
frequency characteristic to be flat, it must be in the range of inertial control. This is because the
frequency f of the input is larger than the lowest resonance frequency fQ, and the wavelength λ
(c / f, c is the speed of sound in air) of the generated sound wave is larger than 2π times the
radius 1 of the speaker cone It is a condition. That is, the input frequency f is left in a region
satisfying the following equations (1) and (2). f) fQ ... 1) λ> g Re-f <gxa · · · (2) Next, the cone
does not perform divided vibration and is a range in which piston motion is performed. The split
vibration is the line of the resonance caused by the bending of the cone K. Assuming that the
lowest frequency of this resonance (31, ie, the lowest frequency of divided vibration is set to fl,
the piston movement range at must be such that f is considerably smaller than f, and in general f
should be l / 4 or less of fl. It is said that it must be done. That is, the condition must be selected
to satisfy the following equation (3). f <7 fl (3) And, in general, since the equation (2) is almost
satisfied, in order to expand the region of B in FIG. I wish I could raise
It is determined by the lowest resonance frequency fori, stiffness of the support of cone 7 and
voice coil b, and the mass of cone 7 and voice coil 5, and this mass can not be increased unless
the efficiency of the speaker is reduced. Resonant frequency f. In the end, it is good to increase
the compliance of the support. However, with conventional loudspeakers, if the compliance is too
large, the supporting part 4 becomes unstable and causes a failure, so the lowest resonance
frequency f in general. Was chosen to be around 60 Hz (4). Also, the lowest frequency f1 of the
divided vibration is conventionally about a value of about several hundreds to several thousand
Hz, and as a result, in the high-frequency range, sharp vibration occurs as shown in FIG. i was.
The lowest frequency f0 of such a divided perturbation, which will be described in detail later, is
outside in inverse proportion to the square of the distance to the end of the cone through which
the vibration from the voice coil is transmitted. Therefore, the basic resonance frequency fl of the
divided vibration can be sufficiently increased by reducing the distance. In the case of a
conventional circular cone, this distance, ie, the radius of the cone, may be reduced, but since the
efficiency of the speaker is related to the area of the cone, reducing the radius will reduce the
efficiency. Therefore, in this invention, it is an object of the present invention to provide a
speaker capable of enhancing the minimum (basic) frequency f of the divided vibration of the
cone without lowering the efficiency of the speaker. This invention is, in summary, a flat speaker
having a voice coil in a rectangular tubular shape or an elliptical tubular shape, and not in the
other tubular shape 1h) but with a long protection on one side and a short protection on the
other side. According to such a voice coil, by adding a long and short other cone to one side, the
distance from which the vibration from the whiss coil is transmitted to the end of the cone
becomes shorter, and the fundamental resonance frequency f1t of the divided vibration -Can be
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large enough. The area of the cone can be increased by making the length of the long side of the
flat shape sufficiently large. That is, it is possible to reduce only the distance that the vibration
from the voice coil is transmitted to the end of the cone without changing the area of the cone.
The above object and other objects and features of the present invention will be apparent from
the following wim description with reference to the drawings. FIG. 8 is an overall perspective
view showing a preferred embodiment of the present invention, FIG. 4 is its own cross-sectional
view, and a fifth symbol is an illustration showing the shape of the voice coil.
In construction, in this embodiment, it is preferably used for the flat rectangular cone 107. Then,
as shown in the example of the 41st El, the core 107 is formed into a cross-corrugated shape by
making a concave or a convex fold in the cross-section, as is particularly apparent from the 41st
El. In this invention, according to the shape of the cone 107, as shown in FIG. 6, the crosssectional shape of the voice coil 105, that is, the curvature perpendicular to the movement
direction of the whistle coil frame 106 is made rectangular. And, this voice coil 105, that is, the
Heus coil frame 1 6 and the cone 10? For example, in the joint portion 113, bonding is
performed by welding, an adhesive, or the like. The voice coil 105 is supported by the porcelain
of the pole 104 and the yoke 102. The support of this coil 106 is the frame 101 and the supports
M108, 108. ... and by. That is, one end t of the support wire 108 is fixed at a predetermined
position of the upper end and the upper end of the wheel coil frame 106, and the other end of
the support wire 10 & is fixed at a predetermined position of flano 101. The support line 108
can be made of, for example, a buoyon, carphone fiber, metal at d or other noodle material. なお
、ヨーク10g、マグネット108. As can be understood from (1) to (8) of the ball 104, the
ball 104 has a vertically-long structure in accordance with the shape of the cone 107. In FIG. 1,
the yoke 10g, the magnet 108 and the pole 104 # i are omitted to simplify the drawing. And 111
is a terminal, 112 is a lead wire. One feature of this embodiment is cone 10? In the waveform
shape. The waveform of the cone 107 is such that the direction of the line formed continuously
by the peaks or valleys of the wave is the direction in which the sound wave travels on the cone
107. That is, the direction of this line is selected to be substantially perpendicular to the line of
contact with the frame 106 of the voice coil 106 driving the cone 107. Conventionally,
corrugation has been performed on cones, but the conventional cone corrugation is, for example,
concentric corrugation, and the line formed by the peaks and valleys is an acoustic wave on the
cone. It is perpendicular to the direction in which Therefore, while such conventional corrugation
aims at alleviating the co-vibration due to the reflected wave from the edge 9 shown in particular
at 111ii1, the unevenness of this embodiment is the lowest of the cone 1070 split vibration. It is
intended to dramatically increase the frequency and move the lowest frequency to a higher
frequency than the reproduction frequency of the speaker.
If a corrugation is added so that the direction of the line made in the mountain valley area or the
direction that follows will be the direction in which the shear wave propagates on the cone, the
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vibration of the shear wave causes the cone to bend. The strength is enhanced, and it becomes
overwhelmingly difficult to bend as compared with a simple plate. As a result, the propagation
speed of the sound wave on the cone is dramatically increased. Therefore, even if the cone 107
vibrates when driven by the voice coil 105, the seven lowest resonance frequencies fl are much
larger than in the case of a simple flat plate. When this point is compared with the case of the
conventional concentric corrugation, in the conventional case, the bending vibration by the
sound wave of the transverse wave transmitted on the cone occurs more easily than in the case
of a simple plate, and as a result, the lowest resonance frequency of the divided vibration fl is
even lower than in the case of the present invention (9) and also in the case of a simple plate. As
described above, the corrugated crease or corrugated shape of the present invention is
fundamentally different from the conventional corrugation in the function and effect. The effects
of the present invention will be quantitatively described below. First, as shown in 6A-, consider
the case where the cone 107 is a simple flat plate. And FIG. 6C shows a cross section when y is
constant. When the voice coil attached to the central portion of the width of the flat plate in the X
direction vibrates, the cone receives forces in two directions, and the central portion of the cone
reciprocates in two directions. As a result, as shown in FIG. 6C, a bend in the x-2 plane occurs. In
FIG. 6C, the central portion of the thickness of the flat plate (cone) is shown by an alternate long
and short dash line. It is assumed that the point on this central plane was at coordinates (x, 7 + 0)
before the deformation of bending, and it is rod axis to (X + y * +) at time t as shown in FIG. 6C.
Suppose. At this time, the equation of motion for the function ζ ( + F + t) is given by the
following equation (4). (Note: For example, Landau-Lifschitz, translated by Sato Tsunezo, Tokyo
Books Co., Ltd. Elastic Side 1 on p. 141, 1 @ l)-ζ EhlP♂ f t 1 □ (□ -gl) (5 xl + d, s The
surface of the central portion of the thickness of the flat plate is offset by two axes in the same
direction, the door is the density of the plate, h is the thickness of the plate, and E is the thickness
of the plate. Young's modulus, C is Poisson's ratio of the plate. Now, due to the vibration of voice
coil 105, cone 10 of this flat plate? Since the force is received from the voice coil frame
continued in the dY-axis direction, the following equation (5) holds, because ζ is constant in the
Y-direction.
♂ζ E h ′ ′ r □ □ 10 − − = 0... (51 δt ′ 1 g (1 − 1) ax ′ and the vibration of the tM 1
formula when the length in the X direction of the plate is 1 and both ends are free ends The
solution is expressed by the following equation (6) C, when the angular frequency is ω and the
number is 7: ζ (x, t) -AeI ′ ′ ′ t ((sinkj + 5inhkjXsinkx + 5inhkx) + (coskl−coshkl) (cogAkt +
coshkx month (where, cosklcashklml = − (7) ω−1 to 1 ·· −)). Here, the value a, ty) of the
minimum wave number is represented by the following equation (9). To-x x 8 (9) Therefore, the
cone 10 of the flat plate shown in FIG. 6A. The lowest (basic) frequency f1a, -8) of the divided
vibration of is given by & 2SLa7hW,-, Q1fl (flat plate) -sr-sπJ1 Next, as shown in FIG. 6B, the
fundamental frequency f1 of the divided vibration when one cone has a waveform shape is
determined. As shown in Fig. 8 or Fig. 6B, when the flat plate is formed into a wave shape, stress
and strain in the Y-axis direction become problematic due to bending, but Poisson's ratio C is
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small. At the same time, the cone having a sufficiently long width in the Y-axis direction also
follows the same equation of motion until the width in the Y-axis direction is short and the rod
can be regarded as a simple rod. That is, the vibration due to bending in the x-Z plane of the
surface on which the convexity of the 6 ml- is reached is the same as the vibration of a bar
having only one wave peak or valley as shown in FIG. 6D. become. This movement follows the
following equation QIIK when the central axis (X axis) shown in FIG. 6D is displaced in two axial
directions by bending. (Note 2 Landau-Lifschitz, translated by Sato Tsunezo, Tokyo Books Co.,
Ltd. Published Elasticity Theory , p. 143) p 5 + 8 □! Work =. At "ax" tapping, S "J, Jf; cross
section 1-f at YZ", 〆df where df is a micro area element of the cross section in the YZ direction.
The vibrational solution of this equation of motion is represented by the previous (@) equation
and for the wavenumber, for the free end of length l in the X-axis direction, as in the case of the
flat plate shown in FIG. 6A. The boundary condition is given by the above equation (7) in the
same manner as L in the case of a flat plate, and hence the relationship between each frequency
ω and the wave number is given by the following equation @. Thus, the fundamental frequency
f0 of the wave-shaped cone 1070 divided vibration shown in FIG. 6B is expressed by the
following equation-. f □ (hidder> 3 + iI sin no 11 ··· (d) Fig. 7A and Fig. 70 are sectional views
showing an example of the waveform shape.
Then, in the cases of FIGS. 7A and 7B, 1 / S of the previous (last) equation is calculated for the
eight shapes of FIG. 7C. At this time, the thickness h of the plate is sufficiently smaller than the
maximum difference dK of the heights of the concavities and convexities, and is neglected. Then,
the fundamental frequency f of the divided vibration in each case is sequentially given by the
next iSu as shown in FIG. 7A'aa + FIG. 7B and FIG. f、(? Double-Koshima Island f □ (Fig. 78)
4H Sus 7--7.3. . ,, snow WrJ "°" where-(1 is the time. When formula (2) is compared with the
bright formula, when the cone 107 is thus corrugated, the thickness h of the flat plate shown in
the company 6A @ 1 is a7T. It is equal to a replaced with la. That is, the mass of the cone 107
remains unchanged by forming unevenness on the cone 107 in such a manner that the line
formed by the self-attached valley follows the direction of the sound wave on the cone. Thus, the
lowest (basic) frequency f1 of the divided vibration can be at least Vh or more. The basic
frequency f □ of the divided vibration when the corrugation, the uneven folds are applied, and
the case of the flat plate is calculated for the woofer and the tweeter specifically below. First, the
length Jli is 16 and the length of one thousand in the Y direction is 45 ai if it is identical to the
conventional 3Qaw woofer, and the thickness h of the plate is Ims, and the maximum difference
in height of the irregularities is Assuming that d is 80 鵬, the frequency f □ (d) in each case of
beryllium and aluminum sound as a cone material is shown in the following Table 1. Also, the
length 1 is 21, the length in the Y-axis direction is Q7− corresponding to the conventional 5a +
tweeter, the thickness h of the plate is α2 ■, and the maximum difference in the thickness of
the asperities is 8− Then, the cone material is beryllium or aluminum, and the frequency fl is
shown in the following Table 2. Table 8 □ Furthermore, the thickness of the board is! ! If! Of
course, it may be possible to thin it to QBaa only in the case of woo or in the case of the tweeter
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only when J ひ つ き. Here, the maximum difference d is 80 ail in woofer and 8 in tweeter in
consideration of the phase difference of the radiated sound waves. That is, it is necessary that the
phase difference of the sound waves emitted from the concave or the convex be sufficiently
smaller than the wavelength λ of the sound wave in air at the highest reproduction frequency of
the woofer or the tweeter, and therefore the maximum difference d is It is because it is limited by
the following formula width.
7 (1 .. Noodles) As can be seen from Tables 1 and 2 above, as shown in this example, the cones
have a line of lines running in the direction of sound wave propagation to the cone as in this
embodiment. The fundamental frequency fl can be increased dramatically. Also, the effect of the
asperity folds is present in the same way in the case where the material of the cone is not metal,
but the cone paper which is usually used or any other material. By this uneven fold, it is possible
to make the fundamental frequency f □ the first one to make the reproduction frequency 1 of
the speaker (one or more times as large as C, and therefore, it is possible to make the cone piston
move as shown in the above equation (3) . For this reason, it is possible to eliminate sharp and
valleys in the high region of the frequency characteristic due to the divided vibration of the
kernel. The above has described the effect of corrugating the cone, but as is apparent from the
previous (rotational) equation and the set, the fundamental frequency f1 of the split vibration is
the distance that the sound wave travels on the cone from the voice film It is understood that it is
in inverse proportion to the cube of the phantom. This property is the basis of this invention.
That is, by making the voice coil frame and the cone into flat shapes (one long and the other
short), the above-described reduction of the sound wave transmission distance on the cone is
achieved, and the area of the cone is large as before It is possible. As in the conventional elliptical
speaker, if the cone is elliptical while the voice coil is cylindrical, the distance of the sound wave
transmitted on the cone in the direction of the major radius of the ellipse is rather large, and the
fundamental frequency f1 of the split resonance Make it smaller. In contrast to this, by stiffening
the flat voice coil frame of the present invention and the cone according thereto, the distance for
transmitting the vibration from the voice coil to the end of the cone can be reduced by 4 in any
direction. Therefore, the fundamental frequency of the split resonance can be made sufficiently
large. Further, in the conventional loudspeaker as shown in FIG. 1, the central portion of the cone
is relatively sharp compared to the peripheral portion, so that the acoustic waves radiated into
the air cause a phase difference on the central portion and the peripheral portion of the cone,
This point also has an adverse effect on the h wave number characteristics. However, in this
embodiment, no phase difference occurs in the sound waves emitted into the air between the
center of the cone and the periphery. Also, the embodiment shown in FIG. 3 does not have a
portion corresponding to the conventional 4f, ',', the cap of the speaker (e.g., 10 in FIG. 1).
Therefore, there is a risk that the air in the voice coil frame 106 will not be in and out of place as
the voice coil 106 vibrates. To this end, in this embodiment, one or more small holes (not shown)
t are opened in the central portion of the cone 107 and used as an air inlet / outlet.
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Furthermore, the 8a! In the embodiment shown in FIG. 1, a further feature is shown. それは、コ
ーン10? That is, the voice coil frame 106 is supported by the support wire 108 without using
a conventional damper structure. If this cone is supported by a damper (8 in FIG. 1) as in the
prior art, K is the minimum resonance frequency f to prevent the support from becoming
unstable. It is difficult to reduce the Moreover, such a conventional damper causes one
mechanical resistance when the voice coil moves, and lowers the efficiency of the speaker, and
the mechanical resistance widens and is constant in the frequency range and the large amplitude
range of the voice coil. Because it does not, it has an influence on the frequency characteristics.
Therefore, in this embodiment, the support ai 108 makes the support of the cone and the voice
coil unstable without using the conventional damper, and the lowest resonance frequency f. A
new support structure that dramatically reduces The eighth garden is, for example, an enlarged
view of a voice coil frame 1041 as shown in FIG. 8 and its supporting wire 108. When one voice
coil 106, that is, the coil frame 106 moves in a direction perpendicular to its axis @ as shown in
this figure, the support line 108 stretches or shrinks, thereby receiving a large restoring force.
However, with respect to movement in the direction of the axis of the voice coil 105 or the frame
106, when the angle θ in FIG. 8 is small, the expansion or contraction of the support @ 108 is
small and the restoring force is small. In other words, the stiffness in the direction perpendicular
to the axis of the coil 105 is very large, and the stiffness to the movement of the voice coil 105
for driving the cone can be sufficiently small, so that the compliance of the support can be The
minimum resonance frequency 101 can be made sufficiently small to be large. The difference in
stiffness according to the movement direction of the voice coil 106 will be quantitatively
described below. FIGS. 9AliQ, 9B and 9C show support lines 108t of only l trees, and based on
FIGS. 9A to 9C, calculate the restoring force generated by the movement of the voice coil 106 in
each case. Do. In FIG. 9A, assuming that the movement of the voice coil in the downward
direction (arrows in FIG. 9A) moves bK and the distance of this point abrIIJ is Δy, the elongation
ΔL of the support line 108 is It is represented by. ΔL−Δy cos θ... 翰 Therefore, the increase in
tension of the support line 108 is represented by the ΔFi primary expression (d).
ΔF = E mutual LAL 儒 LQE is the Young's modulus of the support line 108, and A is the break
of the support line 108! DI[である。 Accordingly, the magnitude fy of the upward restoring
force applied to the whistle coil supported by the support wire 108 is expressed by the following
equation-. Aty-D (cos θ) SΔy ··· 4 (ie, displacement in the direction perpendicular to the axis of
the voice coil (indicated by 9A)-K) Skniness S7 is given by the following formula (2).
S) =−! j (cos θ) 1L ′ ′ ′ ′ Next, as shown in FIG. 9B, the restoring force for the
movement in the uniaxial direction is considered, the elongation ΔL operation of the support line
108 is given by the following equation (2), The increase in tension .DELTA.f is given by the
following equation 2. The axial restoring force fx # 'i given by the voice coil at this time is given
by the following equation (2). jL = Δx sin θ ··· @ ΔF-E = = A · · · fx = "-(sino) 'Δ X-913 That is, the
stiffness S x d next-to-order equation for the displacement of the voice coil in the axial direction
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(shown in Fig. 9B) Given by). Sx = XA-Csing) '[email protected] Thus, when the front set and the formula are
compared, the following equation (6) is obtained, and Sxta ♂ lS, "° angle 0 is sufficiently small,
and material of support line 108 tanned The stiffness can be made sufficiently large if the height
etc. is appropriately selected. Therefore, the voice coil 106 can be held at the center mKL of the
gap between the pole 104 and the seek 102. Furthermore, if the angle It-sufficiently small is
selected, the axial non-stiffened S-blade will be small enough, so that the axial displacement of
the wedge voice coil 10M becomes smooth and the minimum resonance frequency fQt can be
made sufficiently small. In the above description, the restoring force due to the elongation of the
support wire 108 was determined, but the magnitude of the restoring force due to the change of
the seven angles θ, where the tension f: T of the support wire 10 g at the equilibrium position of
the Heus coil 106 is 90 From the figure, it becomes as follows. That is, in the X-axis direction, it
is represented by the following equation (d), and in the Y-axis direction, it is represented by the
following equation (d). t, '= r; COm, lI'! ,, T (co3θ) ′ ′-% 3 ·· Jlfy ′ ± Tdi! U! L illusion "" = T
(! Therefore, the stiffnesses Sx and Sy at this time are given by the following equation (2): l-work.,
snow θ L child ... (E) 'T 5 y 1 r B 1 @' θ here The tension T can be properly fitted to the frame
101 when the support line 108 is added to the frame 101, but the cone 10? And the voice coil l
([6, this stiffness Sx 'is approximately one force.
57 is stiffness set Sx shown by a set of Is and a set. Small enough compared to Sy, negligible.
Thus, if the cone or voice coil is supported by the support wire, a large compliance is obtained
and the lowest resonance frequency f. Can be made smaller. And that's why support is unstable.
FIG. 1O is a structural perspective view showing another embodiment of the present invention-in
FIG. 1 the cone 7ri is shown slightly cut away at its upper end. In this embodiment, in contrast to
the embodiment shown in FIG. 3, the cone 7 is a conventional flat plate, and the support is
provided by the damper 8. And, as the voice coil 106 and the coil frame 106, a rectangular four
as shown by & wAK is used. Correspondingly, the yoke 1Ojl, the magnet lOa and the pole 104 are
also vertically elongated Km as in the embodiment shown in FIG. Although all the voice coils
shown in the above-described example IIF, and in the example, are rectangular, it is possible to
use, for example, an oval i-shaped one as shown in FIG. At this time, the cone f also becomes oval
and oval accordingly. Furthermore, it is necessary to make the magnet, the pole, and the seven
yokes elliptical or oblong to provide a magnetic field perpendicular to the voice coil winding.
That is, this invention is characterized by using a voice coil in which the Ift surface in the
thickness perpendicular to the vibration direction of the cone has a flat (-long for the force and
short for the other) shape. Furthermore, when the loudspeaker according to the present
invention is arranged upright as in the case of the eighth or first O-, its directivity becomes gentle
in the horizontal direction and sharp in the vertical cabinet. Such directivity is extremely
advantageous in practical use as compared to conventional circular ones. That is, considering the
case where several people listen to the sound of the speaker in one room, the positions of the
people's ears vary widely in the horizontal plane, but because the company the person's back
does not change much, the vertical city, ie the upper and lower positions The difference between
12-05-2019
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is small. This means that when the flat (longitudinal) speaker according to the present invention
is placed upright, the directivity in the horizontal plane is slower than that of the conventional
speaker, which is superior to the conventional speaker in this respect. Recognize. As described
above, according to this invention, the voice coil (coil frame) is configured so that the cross
section in a plane perpendicular to the vibration direction of the cone becomes flat, and the cone
has a shape corresponding thereto. The fundamental frequency f1 of the divided vibration of the
cone can be straightened without lowering the efficiency.
In other words, if the width or distance (D is small and the length is long as indicated by the
above equation (D) or Ω), the distance over which the sound wave travels on the cone is changed
without changing the area of the cone. It can be made smaller. Conversely speaking, it is possible
to increase the sides of the cone while keeping the distance the sound wave travels on the cone
constant. Brief Description of T- FIG. 1 is a structural schematic view showing an example of a
conventional electrodynamic direct radiation speaker as a background of the present invention.
Fig. 2110F'i is a diagram showing an example of frequency characteristics of the loudspeaker
shown in Fig. 1; FIG. 8 is a perspective view showing a preferred embodiment of the present
invention, and FIG. 1 is a side view showing the magnetic circuit t # of FIG. 8 and * 1ilO is a voice
showing the shape of a voice coil. It is an illustration figure which shows the cross section
perpendicular ¦ vertical to the motion direction of a coil. 6A to 468 are for explaining the effect
of this corrugation. l!? FIGS. 7A-7C are schematic diagrams showing waveforms applied
respectively. FIG. 8 is an illustrative view showing a voice coil frame 106 supported by a support
wire 10g and showing a next state. 9A to 9C are diagrams for explaining the restoring force
acting on the voice coil (cone) by the support line 108 respectively. FIG. 10 is a structural
perspective view showing another embodiment of the present invention. 11111 is an illustrative
view showing another shape of the whistle coil used in the present invention. In the figure, 101d
frame, iog: yoke, 1011 r17 face, 104t'i ball, 105: voice coil, 106: voice coil frame, 1o7: cone, 108:
support line, 113: bonding or joint portion. Role 'tt δ? 31, ',' 1. :, 'V 2nd eye A □ → −B □□ →
−c−−1 ······. Less than a,-, "" == p + 1. (D8) Masaru '11, ..., Pa, 1-, -27'X, jl, □ 30 / 卯 λ 廼 屓
1k2kSkInk20kJOTEIK & (Hxl 56 concave 8 / Kuno: R: sound *: mirror I out one person fortune
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pongee 0110δ10δ //, 707 ¥ 5 orders, 12" 81t) 856 to I8 to 'Nipa, -' Nsu Detara 7I Fukuyu the
end of Hama - (1 thick in 's four] agency Human resources Riku Sawami 'be' it, Acvt, sH2 γ2 γ7
no-? One sergeant-'two,-two ¥ 6 C accommodation 1 遁 to-鞄 ¥ ¥ 6E Figure 22! Cattle Yl ≦≦ ······
′ ′ square real τ1)?
寥 :: + 1jJ :; ':: 蓚 IL ((IL (か φ thread) agent patent attorney 1 look ˜, λ 7 Z 174 Figure F 7 = to,)
苧 S 苧,-Y ¥ 7 B eye I 1) To 0. Two d-7 N pen ¥ 7 C figure d → 、, □ j! j ", f name Noto, '-?, + u
applicant 1 炙 (1 晟 stone) agent patent attorney Hemi Hisumabe 10 ト γ 105 105 V eyes, □ f'
/ Aevq sig q c FiJ" "X" / / /, □ 10 δ · · 4 I '12 12 real. Tokyo registration registration '-ffi ,, i, 福,
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TS 宋 (1 or 4 thread agent attorney patent attorney Fukami Kube / 1' 悼 2-272 '' '' ′-, 03, oli (, b′ ′ di ′ ′ ′, 0 ′ ′, d 嗜 /, 1 ′ ′ (¥ 1 1 1 △ 5 target of attached documents (1. order of
utility model registration 1 copy (2) 1 specification (3 1) Drawing (4) Power of attorney (1) 6
Applicants and utility model registration persons other than the above (1) Inventors ToyokazuYu-eno, Niji 'address in Osaka Prefecture Toyonaka-shi 7-7 4-7-11 -412 Kebu * v # Name full
name Ii Ikukawa Takeji (2) utility model registration starting point Gishi steel fishing address
Hashimoto City Tochigi Prefecture Harada-cho 141 & -1 Kepkawa S Tsuo Name wart third son I
Ma V Wada Address Tokyo City, Wada 1261-1 1-501 Ima genius power Ombre name Imaoka Rin
# / Mi □ □ address Hyogo Prefecture painters city arrival army town! -1m-47I Muratoyofu
Name 1) Muratomiko Shun-shi Inapaposo Address Army 1K Inakiso City Kashiwazaki City
Inabaso 1-12 No. 11 11 Kimakiko Name Sasaki Makiko /-N 2 ′ ′ Procedure Amendment
Showa s 4 75 Years Patent Office Secretary's name display 1 Showcase ss Utility model
registration application No. 141 922 No. 2 The name of the speaker 3 Relationship with the
person making correction Utility case registration applicant L% soldier * s * ir * Dan * srs-us- 3g
7 / No.-A name J Bika 4) 4 Agent Address Kita-ku, Osaka Tenjinbashi 2-chome 3-9 No. Yachiyo
Daiichi Building Telephone Osaka (06) 351-fi23! 'l (name) name patent attorney (6474) Fukami
Kube 5 complement F date of the instruction ("" "Spontaneous correction work -5, /" the target
specification of the east correction tIPf3igiTh devised 14 * n, a detailed table of j Description
column and a brief description column of the section and the contents of the correction (1)
Specification No. 9 line, line 20, page io, line 2 line 1 of the "invention" as "embodiment" K
correct. (See Specification 菖 page I3 菖 16 and line 16 for rk boundary condition ,
condition for rk K corrects K . (1) Correct the "frequency" on the specification page 13, line
17 by "Angular frequency" K. (4) Detail on page 117, 1st line and thin line to [O1 position] rQ,]
mm4'J, correct to thin down to 4. (6) in the specification, page 17, line 2 1.
The following text is added between "" and "here". (2), the fundamental frequency f 1 of the onepart vibration is determined only by the maximum difference d of the asperities <2) 9, the
thickness hK of the cone is not dependent, and the O frequency of the embodiment The thickness
h can be made sufficiently thin as long as it has a predetermined mechanical strength, and the
cone mass can be reduced accordingly. Thus, the mass of the cone can be reduced to i where the
basic waste wave number fl is kept the same, and as a result, the efficiency of the speaker can be
improved. On the other hand, since it depends on wax of the conventional flat plate cone,
fundamental frequency f14 of division vibration, K so as to come from one set, thickness hlc of
cone, if thickness h is made thinner to improve efficiency Since the fundamental frequency fl is
also reduced, the thickness bB can not be reduced more than a certain level. (6) Alight statement
22nd line 4th line --- .... The following sentence is added after - because the fact that the
restoring force works in the direction opposite to the direction of displacement is more
prosperous than FIG. 8 and in the following description both force and displacement are ignored
Ohshima Satoshi V We will discuss, (3) ff) Correct the "no f" of page 23, first line of the
specification to 1 ΔF. (8) Correct the specification on page 24 first formula and first formula as
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follows. PdrhInedacos # jxfx = T- □ ΔX = Tcos #-= dadxLx2 (co-) ′ ′... (D) clsinOdasin # Δyty
= −7−−Δy = Tsinθ □ d # dyy. 3 [Delta] y == T (s * n #)----($) [Forms 9A to 9C] of the
specification @ZS page, line 8 to line 9 [Figures 9A to 9D] Correct to 4 Figure 9D in a separate
sheet of P. , North 0) Y 9 D eyes · N 756 'Js · 2 practical use! 7X ball applicants 2 Fukumoto
Mafumi (a fool four lines agent patent attorney Fukai Kubu procedure amendment book January
2 1959, Secretary General of Patent Office, 1π of display 1958 utility model registration
number Name of 141922 No. 2 Invention Speaker 8 Relationship with the Case Correction of
Utility Case Application No. Address Address 5-10-1 111 Nishichofu-cho Uemachi, Hyogo Pref.
Provisional [[] Kita-ku Yushin Bridge 2J'lN (number q, l, i to the first primary Nile telephone) Han
T, 06) 351-++ 211 (generation. Name Patent Attorney (li 474) De: Li 5 Part 5 Complement IIInstructions Spontaneous Spontaneous Correction 6 of the instruction, the column 7 of the
detailed description of the invention of the target specification of the correction, the content
specification of the correction, page 24 p. ) Correct the equation and equation (2) as follows.
Note, d sin # dl cos # DELTA X fx = T-Δ DELTA X = T cos $-dl dx L DELTA X = T (coi #)-...-d cos #
dl, sin # DELTA y fy =-T--DELTA V = Ts + n #-deay L 2 DELTA y = T (aim #)-... (2) or more (2)
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