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JP2009164896

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DESCRIPTION JP2009164896
An object of the present invention is to improve light diffusivity in a speaker using a light
diffusion sheet as a diaphragm. SOLUTION: Since the light diffusion pattern of the diaphragm 18
is a light diffusion pattern in which solid minute triangular pyramids 26a and 26b are alternately
arranged adjacent to each other, light is emitted from the multicolor LED 17 on the back surface
of the diaphragm 18. Not only is diffused sufficiently by the lens action of the light diffusion
pattern (pyramids 26a and 26b) when it enters the diaphragm 18 and is transmitted
therethrough and emitted from each side of the triangular pyramids 26a and 26b. The light
emitted from each side of the triangular pyramid 26a, 26b enters the adjacent triangular
pyramid 26a, 26b and is reflected or refracted there, so that the course of the finally emitted
light becomes very random The effect is to increase the diffusion of the [Selected figure] Figure 2
Light diffusion sheet for speaker diaphragm, speaker diaphragm and speaker
[0001]
The invention belongs to the technical field of loudspeakers.
[0002]
There is known a speaker provided with a diaphragm made of translucent synthetic resin and
provided with a light diffusion pattern on one side, and an LED disposed behind the diaphragm
(e.g., JP 2007-259244 A). ).
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JP, 2007-259244, A JP, 2005-252424, A
[0003]
The light diffusion pattern provided on the diaphragm of the speaker disclosed in Patent
Document 1 is formed by arranging the ridges or grooves parallel to one another, arranging
them in a lattice, or arranging them concentrically. Further, Patent Document 2 discloses a light
diffusion pattern in which hollow minute pyramids are continuously connected and disposed.
[0004]
The present invention proposes a light diffusion sheet for a diaphragm of a speaker having a
further improved light diffusion property, a diaphragm of a speaker using the same, and a
speaker using the diaphragm.
[0005]
The light diffusion sheet for the diaphragm of the speaker according to claim 1 is made of a
synthetic resin that transmits light, and has a minute shape in which the area of the cross section
parallel to the bottom decreases from the bottom to the top from the bottom. It is characterized
in that a light diffusion pattern in which solid bodies are arranged adjacent to each other is
provided on one side of the sheet.
[0006]
The light diffusion sheet for the diaphragm of the speaker according to claim 2, wherein the
micro solid is any one of a pyramid, a cone, a truncated pyramid, and a truncated cone, for the
diaphragm of the speaker according to claim 1. Light diffusion sheet.
[0007]
The diaphragm of the speaker according to claim 3 is a diaphragm of the speaker formed by
molding the light diffusion sheet according to claim 1 or 2.
A speaker according to claim 4 is a speaker comprising the diaphragm according to claim 3 and
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an LED disposed behind the diaphragm.
[0008]
Next, embodiments of the present invention will be described by way of examples of the present
invention.
It is needless to say that the present invention is not limited to the following examples and the
like, and can be variously implemented without departing from the scope of the present
invention.
EXAMPLE (Light Diffusing Sheet) As shown in FIG. 1, the light diffusing sheet 25 of the present
example is provided with a light diffusing pattern in which triangular pyramids 26a and 26b
which are minute solids are alternately arranged in a staggered manner. is there.
[0009]
As shown in detail in FIG. 2, one surface 25a of the light diffusion sheet 25 is a flat surface, and
the concavo-convex structure of the triangular pyramids 26a and 26b is provided on the other
surface. Although there is no boundary between the triangular pyramids 26a and 26b and the
substrate portion 25b of the light diffusion sheet 25, the light diffusion sheet 25 is flat if the
surface corresponding to the bottom of the triangular pyramids 26a and 26b is assumed to be a
boundary surface. A large number of triangular pyramids 26a and 26b are placed on the upper
surface of the sheet (substrate portion 25b).
[0010]
It goes without saying that the triangular pyramids 26a and 26b are solid, and are shaped such
that the area of the cross section parallel to the bottom decreases as the base is a isosceles
triangle from the bottom to the top. As a micro solid, the pyramid includes pyramids such as
triangular pyramids (for example, equilateral triangles) other than isosceles triangles, tetragonal
pyramids, hexagonal pyramids, etc., truncated pyramids of these, cones, truncated cones and the
like. Alternatively, it may be a semicircle, a solid having a profile of a vertical cross section which
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is a parabola, or the like.
[0011]
The height of the micro solid (rise from the substrate 25b) is 0.25 mm or less (preferably 0.1 mm
or less), and the size of the bottom is 0.1 mm or more and 1.0 mm on one side in the case of a
pyramid or truncated pyramid The following (preferably 0.13 mm or more and 0.5 mm or less)
and in the case of a cone or truncated cone, a diameter of 0.1 mm or more and 1.0 mm or less
(preferably 0.13 mm or more and 0.5 mm or less) are recommended.
[0012]
Examples of the material of the light diffusion sheet 25, that is, a synthetic resin that transmits
light, include polycarbonate, polyethylene terephthalate, acrylic, polypropylene, polyethylene,
polyvinyl chloride and the like.
Among these, polycarbonate, polyethylene terephthalate and acrylic are suitable for the present
invention.
[0013]
The light diffusion pattern can be provided by pressing on the synthetic resin sheet exemplified
above, but another processing method may be used. (Speaker) As shown in FIG. 3, the speaker 1
of the present embodiment is configured to support each part by a frame 3 which is a skeleton.
Further, the front end of the frame 3 is a square flange 4, and the speaker 1 can be fixed using
the hole 5 provided in the flange 4. The speaker 1 of this embodiment is attached to, for example,
a front frame of a game machine and used, but the application is not limited to this and can be
used widely.
[0014]
The rear wall 7 of the frame 3 is disk-shaped having a wall hole 9, and a magnet 10 is attached
to the back surface 7a. The central hole 11 of the magnet 10 is coaxial with the wall hole 9 and is
in series as shown.
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[0015]
A bobbin 13 is disposed through the wall hole 9 and the center hole 11. A voice coil 12 is wound
around the outer periphery of the bobbin 13 so as to face the center hole 11 of the magnet 10.
Further, the inner peripheral portion of the damper 14 is connected to the outer periphery of the
bobbin 13, and the outer peripheral portion of the damper 14 is fixed to the front surface 7 b of
the rear wall 7. That is, the bobbin 13 is supported by the frame 3 (rear wall 7) via the damper
14, coaxial with the wall hole 9 and the central hole 11, and not in contact with them, and is
displaceable in the axial direction.
[0016]
In addition, an annular printed board 15 along the outer periphery of the damper 14 is attached
to the front surface 7 b of the rear wall 7. A plurality of (12 in this embodiment) multicolor LEDs
17 are mounted on the printed circuit board 15 at equal intervals.
[0017]
The rear end of the diaphragm 18 is connected to the front end of the bobbin 13. The diaphragm
18 is formed by forming the light diffusion sheet 25 described above in a cone shape, and the
diaphragm 18 has the outer peripheral portion of the edge 19 fixed to the frame 3 by the ring
21. A center cap 22 for covering the opening of the bobbin 13 is attached to the inside of the
diaphragm 18.
[0018]
With such a structure, if a signal current is supplied to the voice coil 12, the diaphragm 18 can
be vibrated through the bobbin 13 around which the voice coil 12 is wound to generate sound.
In addition, the light diffusion pattern shown in FIGS. 1 and 2 is provided on the diaphragm 18.
Therefore, when the multicolor LEDs 17 are turned on, the light emitted from them is diffused
and emitted by the light diffusion pattern provided on the diaphragm 18. Therefore, almost the
entire area of the diaphragm 18 can be used for the decoration effect by light emission.
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[0019]
In addition, since the diaphragm 18 is formed by forming the light diffusion sheet 25 provided
with the light diffusion pattern into a cone shape, distortion occurs in the light diffusion pattern
along with the formation. Due to this distortion, for example, the flat sheet provided with the
light diffusion pattern was irradiated with light, for example, the luminance was changed at the
central portion (bobbin 13 side) and the outer peripheral portion (edge 19 side) of the
diaphragm 18. The patterns of diffusion are more varied than sometimes.
[0020]
The light emitted from the multicolor LED 17 is diffused when passing through the diaphragm
18, so that the entire surface of the diaphragm 18 can be illuminated even if the number of
multicolor LEDs 17 is smaller than the light emitting area of the diaphragm 18. .
[0021]
Since the light diffusion pattern of the diaphragm 18 is a light diffusion pattern in which solid
minute triangular pyramids 26 a and 26 b are alternately arranged adjacent to each other, the
diaphragm 18 emits light from the multicolor LED 17 on the back surface of the diaphragm 18.
Not only are diffused sufficiently by the lens action of the light diffusion pattern (pyramids 26a
and 26b) when emitted from the side surfaces of the triangular pyramids 26a and 26b. The light
emitted from each side of 26b enters the adjacent triangular pyramids 26a and 26b and is
reflected or refracted there, so that the course of the finally emitted light becomes very random
and the diffusivity of the light becomes It produces an effect of increasing.
[0022]
On the other hand, as in Patent Document 2, when the bottom of the hollow minute pyramid is
opened on the diaphragm, the light emitted from the inner surface of the hollow pyramid is
emitted from the opening. The present invention is inferior to the present invention in the
randomness of the course of light finally emitted.
[0023]
Also, as in Patent Document 1, forming a light diffusion pattern with convex lines or concave
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lines is inferior to the present invention in the randomness of the course of the light finally
emitted.
The multicolor LED 17 is disposed along the outer periphery of the damper 14 supporting the
voice coil 12, but the portion occupied by the printed circuit board in the front surface 7b of the
rear wall 7 (portion outside the damper 14) is a conventional speaker Since it is a part which was
not used in the above, it is not necessary to create a new space in order to equip the speaker 1
with the multi-color LED 17 (printed circuit board 15), and the speaker 1 is not upsized.
[0024]
The top view of the light-diffusion sheet of an Example.
The top view which expanded a part of light diffusion sheet of an example (a), AA cross section
(b), BB cross section (c), the top view of unit triangular pyramid (d), the explanatory view of an
optical path (E).
The front view (a), longitudinal cross-sectional view (b), side view (c), and rear view (d) of the
speaker of an Example.
Explanation of sign
[0025]
DESCRIPTION OF SYMBOLS 1 ... Speaker, 3 ... Frame, 7 ... Back wall, 10 ... Magnet, 12 ... Voice
coil, 13 ... Bobbin, 14 ... Damper, 15 ... Printed circuit board 17: multicolor LED 18, 18:
diaphragm, 22: center cap, 25: light diffusion sheet, 26a, 26b: triangular pyramid (small solid).
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