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DESCRIPTION JP2018147869

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DESCRIPTION JP2018147869
Abstract: To provide a highly versatile lighting device. A lighting device according to an
embodiment includes a main body, a bobbin, a diaphragm, a light source, a lens, and a cap. The
bobbin has a cylindrical shape, and vibrates with respect to the main body with the axial
direction in the cylindrical shape as the vibration direction. The diaphragm is fixed to the bobbin.
The light source is provided in the hollow portion of the bobbin, and the light emitting surface
faces the open end of the bobbin. The lens is provided in a hollow portion closer to the opening
end than the light source, and the main surface faces the light emitting surface. The cap is
translucent and covers the opening at the open end. [Selected figure] Figure 3
Lighting device
[0001]
The present invention relates to a lighting device.
[0002]
Conventionally, a so-called lighting device with a speaker, which has both a sound source and a
light source, is known.
Such a lighting device coaxially radiates sound and light by coaxially arranging a diaphragm that
vibrates to output sound and a light source that emits light.
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[0003]
JP 2012-186700 A
[0004]
However, in the prior art, light distribution control such as focusing and diffusion of light emitted
from a light source may not be sufficient, and there is a possibility that the use as a lighting
apparatus may be limited.
[0005]
This invention is made in view of the above, Comprising: It aims at providing a highly versatile
illuminating device.
[0006]
In order to solve the problems described above and achieve the object, a lighting device
according to an aspect of the present invention includes a main body, a bobbin, a diaphragm, a
light source, a lens, and a cap.
The bobbin has a cylindrical shape, and vibrates with respect to the main body with the axial
direction of the cylindrical shape as a vibration direction.
The diaphragm is fixed to the bobbin.
The light source is provided in the hollow portion of the bobbin, and the light emitting surface
faces the open end of the bobbin. A lens is provided in the hollow portion closer to the opening
end than the light source, and the main surface faces the light emitting surface. The cap is
translucent and covers the opening at the open end.
[0007]
According to one embodiment of the present invention, a highly versatile lighting device can be
provided.
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[0008]
FIG. 1 is a perspective view of a lighting device according to the embodiment.
FIG. 2 is a top view of the lighting device according to the embodiment. FIG. 3 is a cross-sectional
view of the lighting device according to the embodiment. FIG. 4 is a cross-sectional view of the
lighting device according to the embodiment. FIG. 5 is a top view of the lighting device according
to the embodiment. FIG. 6 is a bottom view of the lighting device according to the embodiment.
[0009]
Hereinafter, the illumination device according to the embodiment will be described with
reference to the drawings. In addition, the relationship of the dimension of each element in
drawing, the ratio of each element, etc. may differ from reality. Even between the drawings, there
may be a case where the dimensional relationships and ratios differ from one another. In the
embodiments described below, expressions such as “parallel”, “vertical”, and “tilt” may be
used, but it is not necessary to strictly satisfy these states.
[0010]
First, the structural example of the illuminating device 1 which concerns on embodiment is
demonstrated using FIGS. 1-3. Drawing 1 is a perspective view of lighting installation 1
concerning an embodiment. FIG. 2 is a top view of the lighting device 1 according to the
embodiment. FIG. 3 is a cross-sectional view of the lighting device 1 according to the
embodiment.
[0011]
First, the appearance of the lighting device 1 according to the embodiment will be described
using FIG. 1. FIG. 1 shows the lighting device 1 as viewed obliquely from above when the
radiation directions of the sound and light emitted from the lighting device 1 are on the upper
side.
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[0012]
Note that FIG. 1 illustrates a three-dimensional orthogonal coordinate system in which the
radiation directions of sound and light are the Z-axis positive direction in order to make the
description easy to understand. Such an orthogonal coordinate system may also be shown in
other drawings used in the following description.
[0013]
The illumination device 1 shown in FIG. 1 is, for example, a downlight, and can output a voice as
background music (BGM) and illuminate a book with light when reading or the like.
[0014]
As shown in FIG. 1, the lighting device 1 according to the embodiment has a columnar shape, and
includes a diaphragm 2, a cap 3, a frame 4, and a main body portion 10.
[0015]
The diaphragm 2 is a plate-like member which is formed in an annular shape and whose central
portion is opened.
The diaphragm 2 is inclined upward from the inner peripheral portion to the outer peripheral
portion as viewed from the cap 3.
The diaphragm 2 has its outer periphery fixed to the frame 4 and its inner periphery fixed to the
bobbin 20 (see FIG. 3). Thereby, the diaphragm 2 vibrates with the outer peripheral portion as a
fulcrum along with the vibration of the bobbin 20. In addition, the outer peripheral part of the
diaphragm 2 may be comprised by another member which used elastic bodies, such as rubber |
gum, for example.
[0016]
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The cap 3 is, for example, a translucent member that is transparent or milky white, is made of
plastic such as polypropylene, resin, or the like, and has a dome shape that protrudes in the
positive Z-axis direction of sound and light radiation. . The cap 3 is provided, for example, at a
position where the outer periphery is fixed to the bobbin 20 and covers the opening 20 c (see
FIG. 3) of the bobbin 20. Thus, the cap 3 prevents dust from entering the opening 20 c of the
bobbin 20. In addition, the shape of the cap 3 may be comprised with another shapes, such as
planar shape and bullet shape.
[0017]
In addition, the cap 3 vibrates in the Z-axis direction along with the vibration of the bobbin 20.
As a result, the cap 3 vibrates together with the diaphragm 2 in accordance with the vibration of
the bobbin 20 to emit a sound. That is, the lighting device 1 also has a function as a speaker.
[0018]
The frame 4 is made of, for example, metal or plastic. The frame 4 has a rectangular flat surface
protruding in the circumferential direction of the lighting device 1, and a mounting hole is
formed around the corner of the flat surface. For example, the lighting device 1 is fixed to the
external device by inserting a fastening member such as a screw into the mounting hole from the
Z-axis positive direction side, for example. In addition, the part below the rectangular-shaped
plane of the flame | frame 4 (Z-axis negative | minus side) is embedded inside an external device.
The frame 4 may have a circular or polygonal flat surface protruding in the circumferential
direction of the lighting device 1.
[0019]
The main body portion 10 includes a plate 11, a magnet 12, a bottom yoke 13 (see FIG. 3), and a
heat sink 14. The plate 11 has a ring shape, is made of a magnetic metal material, is fixed to the
frame 4 at the upper end surface, and is disposed so as to surround the bobbin 20 without
contacting the outer peripheral surface of the bobbin 20.
[0020]
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The magnet 12 has a ring shape, is fixed to the lower end surface of the plate 11, and is disposed
so as to surround the bobbin 20 without contacting the outer peripheral surface of the bobbin
20.
[0021]
The bottom yoke 13 is a member having a cylindrical portion and a flange-shaped portion (see
FIG. 3), and is made of a magnetic metal material.
Further, the bottom yoke 13 is fixed to the lower end surface of the magnet 12 at the flangeshaped portion.
[0022]
The heat sink 14 is a heat radiating member that releases the heat generated when the light
emitting unit 5 described later emits light. In the heat sink 14, a plurality of radiation fins 14a
(see FIG. 3) protruding in the Z-axis negative direction are arranged at intervals. The heat sink 14
receives heat from the heat radiating portion 15 described later and releases the heat.
[0023]
Next, the top view of the lighting device 1 according to the embodiment will be described with
reference to FIG. In FIG. 2, the figure which looked at the illuminating device 1 from the Z-axis
positive direction side which is a radiation direction of a sound and light is shown.
[0024]
As shown in FIG. 2, the lighting device 1 according to the embodiment is provided with the light
emitting unit 5 inside. The light emitting unit 5 includes a light source 5 a and a fixing unit 5 b,
and is provided at the center of the diaphragm 2 and the cap 3 in top view.
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[0025]
The light source 5a is, for example, an LED (Light Emitting Diode), and is provided, for example,
at a position where the circular light emitting surface 5a1 (see FIG. 3) faces upward in the Z-axis
positive direction in top view. The fixing portion 5 b is a fixing member that fixes the light
emitting portion 5 by fixing the lower end surface on the Z-axis negative direction side to the
main body portion 10.
[0026]
In addition, although the case where the light emission part 5 was provided in the center of the
diaphragm 2 and the cap 3 was shown in the top view of FIG. 2, not only this but the center of
the light emission part 5 and the center of the diaphragm 2 and the cap 3 And may be different
from each other. Moreover, although the light emission part 5 showed the case of one, it does not
restrict to this and there may be multiple light emission parts 5.
[0027]
Next, a cross-sectional view of the illumination device 1 according to the embodiment will be
described with reference to FIG. In FIG. 3, the cross section at the time of cut | disconnecting the
illuminating device 1 by AA line in FIG. 2 is shown.
[0028]
As shown in FIG. 3, the lighting device 1 further includes a bobbin 20, a damper 30, and a heat
dissipation unit 15. The bobbin 20 is cylindrical, the voice coil 21 is wound around the outer
peripheral surface, and the light emitting portion 5 is disposed in the hollow portion 20 b. The
voice coil 21 is a lead wire and one end thereof is connected to an external device, whereby an
AC audio signal is input from the external device.
[0029]
The diaphragm 2 is a truncated cone whose upper and lower sides are open in the Z-axis
direction, and the cap 3 is provided in the small opening on the lower side, and sound and light
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from the light source 5a move from the small opening toward the large opening on the upper
side. It is emitted.
[0030]
Here, the cylindrical portion of the bottom yoke 13 is provided along the inner peripheral surface
of the bobbin 20 and is arranged so as to form a space for generating magnetism with the plate
11.
[0031]
That is, in the state where magnetism is generated between the bottom yoke 13 and the plate 11,
when the voice signal is input to the voice coil 21, the bobbin 20 vibrates according to the voice
signal.
At this time, the main body portion 10 does not vibrate with the vibration of the bobbin 20.
That is, the bobbin 20 vibrates relative to the main body 10 with the Z axis direction, which is the
cylindrical axial direction, as the vibration direction.
[0032]
Further, the diaphragm 2 and the cap 3 are fixed to the bobbin 20 at an open end 20 a which is
one end on the cap 3 side. In addition, only the diaphragm 2 may be fixed to the bobbin 20 and
the cap 3 may be fixed to the diaphragm 2. Alternatively, only the cap 3 may be fixed to the
bobbin 20 and the diaphragm 2 may be fixed to the cap 3. Further, the diaphragm 2 and the cap
3 may be fixed to the outer peripheral surface of the bobbin 20, not limited to the opening end
20a.
[0033]
The damper 30 has a ring shape, and the inner peripheral portion is fixed to the outer peripheral
surface of the bobbin 20 and the outer peripheral portion is fixed to the frame 4. The damper 30
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damps vibration in the Y-axis direction which is the circumferential direction of the bobbin 20.
The damper 30 may have another shape such as a damper using a leaf spring or a butterfly
damper. Also, a plurality of sheets may be provided at intervals in the Z-axis direction. Or it is not
necessary.
[0034]
The heat radiating portion 15 is a columnar member provided as a part of the main body portion
10 and made of, for example, a material having a relatively high thermal conductivity such as
copper. The heat radiating portion 15 absorbs the heat accompanying the light emission of the
light emitting portion 5 fixed to the upper end surface, and transmits the heat to the heat sink
14.
[0035]
The heat dissipation portion 15 is not limited to a columnar shape, and may be, for example, a
hollow columnar shape having an upper end surface. Alternatively, the heat radiating portion 15
may be a so-called heat pipe in which the working fluid is sealed in the pipe.
[0036]
Here, a conventional lighting device will be described. In the conventional lighting device, light
emitted from the light source is emitted to the outside (the positive side in the Z-axis direction in
FIG. 3) through the cap that does not perform light distribution control. That is, the conventional
lighting device only emits constant light to the outside, and for example, light distribution control
such as focusing and diffusion of light has not been sufficiently performed.
[0037]
For this reason, it becomes difficult to change light distribution according to a use application,
and the conventional illumination device will limit the use application as an illumination device.
From such a point of view, a highly versatile lighting device has been desired.
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[0038]
Therefore, the illumination device 1 according to the embodiment includes the lens 40 that
performs light distribution control of the light of the light source 5a. The lens 40 is made of, for
example, a plastic such as polycarbonate, or a resin such as acrylic or silicon, and is fixed at a
predetermined position by the lens holder 41. Specifically, the lens 40 is provided in the hollow
portion 20b closer to the opening end 20a than the light source 5a, and the main surface 40a of
the lens 40 faces the light emitting surface 5a1.
[0039]
That is, the illumination device 1 according to the embodiment performs light distribution
control such as focusing or diffusion of light by the lens 40 provided on the radiation direction
side of the light source 5a. Therefore, since the light distribution control according to the use
application is attained, the versatility as the illuminating device 1 can be improved.
[0040]
Next, the cross section of the illumination device 1 according to the embodiment will be further
described using FIG. 4. FIG. 4 is a cross-sectional view of the lighting device 1 according to the
embodiment. FIG. 4 shows a cross-sectional view in which the vicinity of the light source 5a in
the cross section in FIG. 3 is enlarged. Further, FIG. 4 shows the central axis O of the bobbin 20.
Further, in FIG. 4, a part of the cap 3 when the cap 3 comes closest to the lens 40 with the
vibration of the bobbin 20 is shown by a dashed dotted line.
[0041]
As shown in FIG. 4, the light source 5 a is provided at a position where the central axis O of the
bobbin 20 passes. Specifically, the central axis O of the bobbin 20 and the light source 5a are
coaxial. Here, the central axis O of the bobbin 20 and the central axis of the cap 3 are also
coaxial. That is, the light source 5a and the cap 3 which is a sound source are coaxial.
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[0042]
Therefore, light and sound emitted from the light source 5a and the cap 3 can coexist and emit
without interference with each other.
[0043]
Further, as shown in FIG. 4, a space S <b> 1 is formed between the lens 40 and the cap 3.
That is, the lens 40 is separated from the cap 3 closest to the lens 40 with the vibration
(maximum amplitude) of the bobbin 20. Thereby, even if the amplitude of the bobbin 20 is
maximum, since the lens 40 and the cap 3 do not physically interfere, light distribution control
can be stably performed.
[0044]
The lens 40 is a thin lens having a thickness of 0.5 mm to 2.0 mm in the axial direction (Z-axis
direction). As a result, physical interference between the lens 40 and the cap 3 can be prevented,
and the freedom of arrangement of the lens 40 in the axial direction can be increased, so that the
light distribution control performance can be improved.
[0045]
The lens 40 is fixed to the upper end surface of the bottom yoke 13 via the lens holder 41.
Further, the light source 5 a is fixed to the upper end surface of the heat radiating portion 15.
That is, the main body 10 supports the light source 5 a and the lens 40.
[0046]
Specifically, the lens 40 is disposed such that a space S2 is formed between the lens 40 and the
bobbin 20. In other words, since the light source 5a and the lens 40 do not physically interfere
with the bobbin 20, the distance between the light source 5a and the lens 40 does not change
due to the vibration of the bobbin 20.
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[0047]
Therefore, even if the bobbin 20 vibrates, the distance between the light source 5a and the lens
40 can be kept constant, so that stable light distribution control can always be performed.
[0048]
Next, the top view of the illumination device 1 according to the embodiment will be further
described using FIG. 5.
FIG. 5 is a top view of the lighting device 1 according to the embodiment. In FIG. 5, the top view
of the illuminating device 1 in the state which took the cap 3 is shown from a viewpoint of
legibility. Moreover, in FIG. 5, the point which shows the central axis O of the bobbin 20 in FIG. 4
is shown.
[0049]
As shown in FIG. 5, the light source 5a is provided at a position where the central axis O of the
bobbin 20 passes in a top view. More preferably, the central axis O of the bobbin 20 is provided
at a position passing through the center of the light source 5a.
[0050]
Further, as shown in FIG. 5, the lens holder 41 is provided along the entire circumferential end of
the lens 40. The lens holder 41 does not necessarily have to be provided all around the
circumferential end, and may be provided, for example, at a part of the circumferential end as
long as the lens 40 can be supported.
[0051]
Further, as shown in FIG. 5, the space S <b> 2 has a ring shape, and is provided over the entire
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circumference between the bobbin 20 and the lens 40. That is, since the bobbin 20 and the lens
40 are separated by the space S2, they do not physically interfere with each other. Therefore,
when vibrating in the Z-axis direction which is the axial direction of the bobbin 20, the lens 40
can be prevented from being affected by the vibration.
[0052]
Next, the bottom surface of the lighting device 1 according to the embodiment will be described
with reference to FIG. Drawing 6 is a bottom view of lighting installation 1 concerning an
embodiment. In FIG. 6, the illuminating device 1 seen from the Z-axis negative direction is shown.
[0053]
As shown in FIG. 6, the heat radiation fins 14a of the heat sink 14 are plate-like members
extending in the X-axis direction, and a plurality of heat radiation fins 14a are arranged at
intervals in the Y-axis direction.
[0054]
The heat radiating portion 15 is provided at a central portion in a bottom view of the heat sink
14, and the entire outer peripheral portion is covered by the heat sink 14.
Further, the heat radiating portion 15 has a larger area than the light emitting portion 5 in a
bottom view.
[0055]
As a result, heat can be prevented from leaking to members other than the heat radiating portion
15, and heat can be reliably transmitted to the heat sink 14.
[0056]
Further, as shown in FIG. 6, the cap 3 has an outer diameter larger than that of the lens 40.
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That is, since the cap 3 is provided to cover the lens 40, adhesion of dust and the like to the lens
40 can be prevented.
[0057]
As described above, in the lighting device 1 according to the embodiment, the bobbin 20 has a
cylindrical shape, and vibrates with respect to the main body 10 with the axial direction of the
cylindrical shape as the vibration direction. The diaphragm 2 is fixed to the bobbin 20. The light
source 5 a is provided in the hollow portion 20 b of the bobbin 20, and the light emitting surface
5 a 1 faces the opening end 20 a of the bobbin 20. The lens 40 is provided in the hollow portion
20b closer to the opening end 20a than the light source 5a, and the main surface 40a faces the
light emitting surface 5a1. The cap 3 is translucent and covers the opening 20 c of the opening
end 20 a. Thereby, since the light distribution control of the light of the light source 5a can be
performed, the versatility as the illuminating device 1 can be improved.
[0058]
Further, in the illumination device 1 according to the embodiment, the lens 40 is separated from
the cap 3 closest to the lens 40 as the bobbin 20 vibrates. Thereby, even if the amplitude of the
bobbin 20 is maximum, since the lens 40 and the cap 3 do not physically interfere, light
distribution control can be stably performed.
[0059]
Moreover, in the illuminating device 1 which concerns on embodiment, the light source 5a is
provided in the position which the central axis O of the bobbin 20 passes. Thereby, the light and
the sound emitted from the light source 5a and the cap 3 can coexist and be emitted without
interfering with each other.
[0060]
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Moreover, in the illuminating device 1 which concerns on embodiment, the thickness of the axial
direction of the lens 40 is 0.5 mm-2.0 mm. As a result, physical interference between the lens 40
and the cap 3 can be prevented, and the freedom of arrangement of the lens 40 in the axial
direction can be increased, so that the light distribution control performance can be improved.
[0061]
Further, in the lighting device 1 according to the embodiment, the main body unit 10 supports
the light source 5 a and the lens 40. Thereby, even if the bobbin 20 vibrates, the distance
between the light source 5a and the lens 40 can be kept constant, so that stable light distribution
control can always be performed.
[0062]
In the embodiment described above, the light source 5a transfers heat to the heat sink 14 via the
heat radiating portion 15. However, the present invention is not limited to this. For example, heat
may be transferred directly to the heat sink 14. That is, the heat sink 14 may have the function of
the heat sink 15 by replacing the heat sink 15 with the heat sink 14.
[0063]
Alternatively, both the heat radiating portion 15 and the heat sink 14 may be omitted.
Specifically, the light source 5 a is fixed to the bottom yoke 13. The bottom yoke 13 absorbs the
heat of the light source 5 a and dissipates the heat to the outside. That is, the bottom yoke 13 has
the functions of both the heat sink 14 and the heat radiating portion 15.
[0064]
Moreover, in the embodiment mentioned above, although the light source 5a was provided in the
inside of the hollow part 20b of the bobbin 20 in the side view (refer sectional drawing of FIG. 3)
of the illuminating device 1, it is not limited to this. For example, the light source 5a may be the
hollow portion 20b of the bobbin 20 (inside the circumference of the bobbin 20 shown in FIG. 5)
in the top view of the lighting device 1.
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[0065]
Further, the present invention is not limited by the above embodiment. What is configured by
appropriately combining the above-described constituents is also included in the present
invention. Further, further effects and modifications can be easily derived by those skilled in the
art. Therefore, the broader aspects of the present invention are not limited to the above
embodiment, and various modifications are possible.
[0066]
DESCRIPTION OF SYMBOLS 1 lighting apparatus 2 diaphragm 3 cap 5a light source 5a1 light
emission surface 10 main-body part 20 bobbin 20a opening end 20b hollow part 20c opening
40 lens 40a main surface
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