Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
Uniformly Illuminating LED Light Strip
FIELD OF THE INVENTION
[0001] The present invention relates to the field of lighting technology,
particularly to a uniformly illuminating LED light strip.
BACKGROUND OF THE INVENTION
[0002] Because of its characteristics of soft, light, pure color and easy
installation,
, LED light strips are widely used in decoration of building contours,
steps, booths,
bridges, hotels, KTV decorative lighting, advertising signs, advertising
designs for
animations, scripts and paintings, and so on.
[0003] Since the light of a LED chip on a LED light is directly emitted in the
prior
art, the LED chip can be seen from the light emitting surface of the light
strip and
the light at the center of the LED chip is brighter than the light at other
positions,
which affect the decoration and lighting effects.
SUMMARY OF THE INVENTION
[0004] A technical problem to be solved by the present invention is to provide
a
uniformly illuminating LED light strip which is cost-effective and suitable
for
decoration and lighting.
[0005] A technical problem to be solved by the present invention is to provide
a
uniformly illuminating LED light strip of good heat dissipation.
[0006] A technical problem to be solved by the present invention is to provide
a
uniformly illuminating LED light strip which is safe and durable for use.
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[0007] In order to solve above technical problems, the present invention
provides
a uniformly illuminating LED light strip comprising an outer casing, an inner
casing disposed within the outer casing, and a light-emitting component
disposed
within the inner casing, wherein the light-emitting component includes a
substrate
and at least one LED illuminant disposed on the substrate, the outer casing
comprises a light-transmitting layer and a reflective layer, the reflective
layer is
located on both sides of the light-transmitting layer and extends to the
bottom of
the light-transmitting layer, a vacant part is disposed in the light-
transmitting layer
along its length direction, the light emitted by the LED illuminant is
refracted by
the vacant part and then exits through the light-exiting surface of the
light-transmitting layer, the refractive index of the light-transmitting layer
is
1.12-1.32 times that of the vacant part, and the thickness of the light-
transmitting
layer is 0.17-0.35 times that of the outer casing.
[0008] Preferably, the vacant part is filled with carbon dioxide and/or
nitrogen
gas.
[0009] Preferably, the cross-sectional area of the vacant part is 10% to 60%
of the
cross-sectional area of the light-transmitting layer.
[00010] Preferably, the reflective layer comprises a first reflective layer
and a
second reflective layer, the first reflective layer is set on both sides of
the
light-transmitting layer, and the second reflective layer is on the bottom of
the
light-transmitting layer.
[00011] Preferably, the reflectivity of the first reflective layer is 1.25-
1.63 times
that of the second reflective layer.
[00012] Preferably, the thickness of the first reflective layer is less than
that of the
light-transmitting layer, the expansion coefficient of the light-transmitting
layer is
greater than that of the first reflective layer.
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[00013] Preferably, a cavity is disposed in the inner casing along its length
direction, the light-emitting component is set in the cavity, a toothed strip
is
disposed on a sidewall facing a LED illuminant of the cavity, the light
emitted by
the LED illuminant is refracted by the toothed strip.
[00014] Preferably, a slot is disposed on a sidewall of the cavity, a side
edge of the
substrate is locked in the slot for fixing the substrate in the cavity.
[00015] Preferably, the light-emitting component further comprises two
conductive strips, the conductive strips are disposed on both sides of the LED
illuminant.
[00016] Preferably, the conductive strip is a copper wire or a copper plate
and
fixed on the substrate by soldering.
[00017] The implementation of the present invention has the following
advantages.
[00018] 1. The present invention provides a uniformly illuminating LED strip
comprising an outer casing, an inner casing disposed within the outer casing,
and
a light-emitting component disposed within the inner casing, wherein the
light-emitting component includes a substrate and at least one LED illuminant
disposed on the substrate, the outer casing comprises a light-transmitting
layer and
a reflective layer, the reflective layer is disposed on two sides of the
light-transmitting layer and extends to the bottom of the light-transmitting
layer,
the light-transmitting layer is provided with a vacant part along the length
thereof,
the light emitted by the LED illuminant is refracted by the vacant part and
then
exits through the light-exiting surface of the light-transmitting layer. In
the present
invention, the light of both large-angle and small-angle light emitted by the
LED
illuminant is reflected and refracted by the mutual cooperation of the vacant
part
and the reflective layer, and finally exited through the light-exiting surface
of the
light-transmitting layer, making the light of the light strip more uniform and
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improving the decoration and lighting effect of the light strip.
[00019] 2. The present invention provides a uniformly illuminating LED strip,
wherein the reflective layer comprises a first reflective layer and a second
reflective layer, the first reflective layer is set on both sides of the
light-transmitting layer, and the second reflective layer is on the bottom of
the
light-transmitting layer, wherein the reflectivity of the first reflective
layer is
greater than that of the second reflective layer. In the present invention,
both
large-angle and small-angle light emitted by the LED illuminant is reflected
and
refracted by the mutual cooperation of the vacant part, the first reflective
layer and
the second reflective layer, and finally exited through the light-exiting
surface of
the light-transmitting layer, making the light of the light strip more uniform
and
improving the decoration and lighting effect of the light strip.
[00020] 3. The invention provides a uniformly illuminating LED light strip,
wherein the vacant part is filled with carbon dioxide and/or nitrogen gas,
since
both the refractive index and the thermal conductivity of carbon dioxide and
nitrogen gas are greater than that of air, the vacant part filled with carbon
dioxide
and/or nitrogen improve the heat dissipation effect and light uniformity of
the
light strip.
[00021] 4. The invention provides a uniformly illuminating LED strip, wherein
the cavity is provided with a toothed strip on the sidewall of the LED
illuminant,
and the light emitted by the LED illuminant is refracted by the tooth stripe
making
the light of the strip more uniform, therefore, when the light emitted by the
light
strip is projected onto the object, the color is uniform avoiding
discoloration or
spotting when the light strip lights up, so that the overall appearance of the
strip is
more beautiful.
[00022] 5. The invention provides a uniformly illuminating LED strip, wherein
the substrate is provided with a conductive strip for forming an electrical
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connection between the external power source and the substrate. When
installing,
it is only necessary to install the substrate in the inner casing which is
labor saving,
allowable for automatic production and efficient.
BRIEF DESCRIPTION OF DRAWINGS
[00023] Figure 1 shows a exploded view of an LED light strip of the present
invention.
[00024] Figure 2 shows a sectional view of an LED light strip of the present
invention.
[00025] Figure 3 shows a stereogram of an LED light strip of the present
invention.
[00026] Figure 4 shows a sectional view of another LED light strip of the
present
invention.
DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS
[00027] To better illustrate the present invention in aspects of the
objective,
technical scheme and advantages, the present invention is further described in
detail with reference to the accompanying drawings.
[00028] Referring to FIG. 1 to FIG. 3, the present invention provided a
uniformly
illuminating LED strip, comprising an outer casing 1, an inner casing 2
disposed
in the outer casing 1, and a light-emitting component disposed in the inner
casing
2. The light-emitting component 3 comprised a substrate 31 and at least one
LED
illuminant 32 disposed on the substrate 31. The outer casing 1 comprised a
light-transmitting layer 11 and a reflective layer, and the reflective layer
was
located on two sides of the light-transmitting layer 11 and extended to the
bottom
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of the light-transmitting layer. The light-transmitting layer 11 was provided
with a
vacant part 111 along the longitudinal direction thereof, and the light
emitted by
the LED illuminant 32 was refracted by the vacant part 111 and then exited
through a light-exiting surface 112 of the light-transmitting layer 11, the
refractive
index of the light-transmitting layer 11 is 1.12-1.32 times that of the
cavity.
[00029] Specifically, when the refractive index of the light-transmitting
layer 11
was less than 1.12 times of the refractive index of the vacant part 111, the
refraction effect of the vacant part was not obvious, and the light strip
would not
be effectively illuminating uniformly; when the refraction index of the
light-transmitting layer 11 was greater than 1.32 times of the refractive
index of
111 of the vacant part, the light was likely to be totally reflected, and the
light strip
would not be effectively illuminating uniformly either. Only in the range of
1.12
to 1.32, the light could be uniformly emitted.
[00030] Since the light emitted by the LED illuminant 32 needs to be refracted
by
the vacant part 111 and then emitted through the light-exiting surface 112 of
the
light-transmitting layer 11, the thickness of the light-transmitting layer 11
was
0.17-0.35 times that of the outer casing 1 in order to guarantee the light
uniformity
and the luminous efficiency of the light strip. When the thickness of the
light-transmitting layer 11 was less than 0.17 times the thickness of the
outer
casing 1, the light could not be effectively refracted, which affected the
uniformity
of the light emitted by the light strip; when the thickness of the light-
transmitting
layer 11 was greater than 0.35 times the thickness of the outer casing 1, the
light
extraction efficiency of the light strip was reduced.
[00031] In order to further improve the light uniformity of the light strip
and
improve the heat dissipation effect of the light strip at the same time, the
vacant
part 111 was filled with carbon dioxide and/or nitrogen gas. Since both the
refractive index and the thermal conductivity of carbon dioxide and nitrogen
gas
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=
are higher than that of air, the vacant part 111 filled with carbon dioxide
and/or
nitrogen gas improved the heat dissipation effect and illuminating uniformity
of
the light strip.
[00032] A cross-sectional shape of the vacant part 111 of the present
invention
was circular, elliptical, triangular, star-shaped or rectangular, but was not
limited
thereto. The cross-sectional area of the vacant part 111 was 10% to 60% of the
cross-sectional area of the light-transmitting layer 11. When the cross-
sectional
area of the vacant part 111 was less than 10% of the cross-sectional area of
the
light-transmitting layer 11, it was difficult for the vacant part 111 to
effectively
refract the light, and the light emitted by the light strip was not uniform;
when the
vacant part 111 had a larger cross-sectional area than 60% of the cross-
sectional
area of the light-transmitting layer 11, the supporting strength of the
light-transmitting layer 11 was dropped, so that the outer casing 1 was liable
to
collapse and affect the appearance of the light strip. Preferably, the cross-
sectional
area of the vacant part 111 was 20%-50% of the cross-sectional area of the
light-transmitting layer 11. More preferably, the cross-sectional area of the
vacant
part 111 was 25% to 45% of the cross-sectional area of the light-transmitting
layer
11.
[00033] The reflective layer included a first reflective layer 12 and a second
reflective layers 13. The first reflective layer 12 was disposed on two sides
of then
the light-transmitting layer 11, and the second reflective layer 13 was
disposed on
the bottom of the light-transmitting layer 11, that is, the second reflective
layer 13
connected the two opposing first reflective layers 12.
[00034] In order to save material and reduce cost without affecting the light
uniformity and light extraction efficiency of the light strip, the thickness
of the
first reflective layer 12 was smaller than the thickness of the light-
transmitting
layer 11. Since the light strip undergone thermal expansion and contraction
under
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different temperature conditions, in order to prevent cracks in the light
strip and to
prevent moisture from entering, the expansion coefficient of the light-
transmitting
layer was greater than that of the first reflective layer.
[00035] The light-transmitting layer 11 of the present invention was made of a
light-transmitting material, and the reflective layer was made of a reflective
material, wherein the light-transmitting material had a expansion coefficient
greater than that of the reflective material. Specifically, the light-
transmitting layer
11 and the reflective layer of the outer casing 1 were of a unitary structure,
and the
light-transmitting layer 11 and the reflective layer could be formed into a
unitary
structure by heat welding or multi-color co-extrusion.
[00036] In order to facilitate the production and processing of the outer
casing 1,
it is further preferred that the light-transmitting layer 11 was a transparent
silicone
sleeve, and the reflective layer was a reflective silicone panel. Therefore,
the
light-transmitting layer 11 and the reflective layer could be integrally
processed by
extrusion molding, and then the reflective silicone panel was subjected to
reflection treatment so that the silicone panel is reflective.
[00037] Preferably, the reflectivity of the first reflective layer 12 was
greater than
the reflectivity of the second reflective layer 13, and the light emitted by
the LED
illuminant 32 was reflected by reflective layers of different reflectivity to
have
more uniform light emission. Preferably, the reflectivity of the first
reflective layer
12 is 1.25-1.63 times that of the second reflective layer 13.
[00038] A light-emitting surface of the LED illuminant 32 faced the first
reflective
layer 12 of the outer casing 1. After the light of a small-angle emitted by
the LED
illuminant 32 was repeatedly reflected by the first reflective layer 12, part
of the
light was refracted by the vacant part 111 and emitted through the light-
exiting
surface 112 of the light-transmitting layer 11 facilitating the diffusion and
uniformity of light, and part of the light was directly emitted through the
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light-exiting surface 112 of the light transmitting layer 11. When the LED
illuminant 32 emitted the light of a large angle, part of the light was
reflected by
the second reflected layer 13 and then emitted through the light-exiting
surface
112 of the light-transmitting layer 11, and part of the light was directly
emitted
through the light-exiting surface 112 of the light-transmitting layer 11.
[00039] In the present invention, both the large-angle light and the small-
angle
light emitted by the LED illuminant 32 were reflected and refracted by the
mutual
cooperation of the vacant part 111, the first reflective layer 12 and the
second
reflective layer 13, and finally emitted through the light-exiting surface 112
of the
light-transmitting layer 11 making the lighting of the light strip more
uniform and
improving the decoration and lighting effect of the light strip. In addition,
the
light-emitting surface of the LED illuminant 32 of the present invention
directly
faced the first reflective layer 12 instead of the light-exiting surface 112,
so that
the light emitted by the light strip was softer, the LED illuminant 32 and the
substrate 31 would not be seen directly thus providing a more pleasing
appearance
of the light stripe.
[00040] The inner casing 2 of the present invention was provided with an
cavity
21 along its longitudinal direction, and the light-emitting component was
disposed
in the cavity 21. A slot was set in a sidewall of the cavity 21, and a side
edge of
the substrate 31 was locked in the slot for fixing the substrate 31 in the
cavity 21.
[00041] In order to improve the luminous efficiency and the light uniformity
of
the light strip, a sidewall of the cavity 21 facing the LED illuminant 32 was
provided with a toothed stripe 22, and the light emitted by the LED illuminant
32
was refracted by the tooth stripe 22, so that a light emitting angle was
wider, then
the large-angle light and the small-angle light emitted by the LED illuminant
32
were reflected and refracted by the mutual cooperation of the vacant part 111,
the
first reflective layer 12 and the second reflective layer 13 making the light
emitted
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more uniform, so that the color of the light emitted by the light strip was
uniform
when projected onto the object, thereby avoiding discoloration or spotting
when
the light strip turned on, so that the light strip would be more pleasing to
the eye.
[00042] Preferably, many toothed strips 22 were disposed on the sidewall of
the
cavity 21, and the toothed strips 22 were uniformly disposed along the
sidewall of
the cavity 21. More preferably, the toothed strip 22 was straight, and many
straight
strips were arranged in parallel along the length direction of the outer
casing 1. Of
course, the toothed strip 11 could be provided in other shapes, such as S-
shaped
apart from being straight. Besides, the cross-sectional shape of the toothed
strip 11
was triangular, wavy or semi-circular, but was not limited thereto.
[00043] In order to save labor, cany out automated production, and improve
production efficiency, the substrate 31 was provided with a conductive strip
33 for
electrically connecting the external power source to the substrate 31. The
conductive strip 33 was a copper wire or a copper plate, but was not limited
thereto. In the present invention, the conductive strips 33 may also be made
of
other conductive metals. The conductive strip 33 was fixed to the substrate 31
by
soldering and thus was integrated with the substrate 31 in structure. When
mounting, it is only necessary to mount the substrate 31 in the inner casing
2. The
previous method requires manual insertion of the copper wire into the inner
casing
2 to form an electrically conductive connection with the substrate 31, which
is
inefficient in production.
. [00044] Specifically, the substrate 31 was a flexible circuit board, and the
substrate 31 was provided with many LED illuminants 32. The LED illuminants
32 were convex on the substrate 31 and arranged in a row. The inner casing 2
was
encapsulated by injection molding to enclose the light-emitting component.
[00045] Referring to FIG. 4, FIG. 4 is a cross-sectional view showing another
embodiment of the LED light strip of the present invention. The light-emitting
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surface of the LED illuminant 32 faced the vacant part 111 of the light
transmitting layer 11, and the light of a small-angle emitted by the LED
illuminant
32 was refracted by the vacant part 111. Part of the light exited through the
light-exiting surface 112 of the light-transmitting layer 11, and part of the
light
was reflected by the first reflective layer 12 and then exited through the
light-exiting surface 112 of the light-transmitting layer 11, which facilitate
the
light diffusion. After the light of a large-angle emitted by the LED
illuminant 32
was repeatedly reflected by the first reflective layer 12, part of the light
was
refracted by the vacant part 111 and exited from the light-exiting surface 112
of
the light transmitting layer 11, part of the light was directly exited through
the
light-exiting surface 112 of the light transmitting layer 11.
[00046] In the embodiment, the light of both large-angle and small-angle
emitted
by the LED illuminant 32 were reflected and refracted by the mutual
cooperation
of the vacant part 111, the first reflective layer 12, and the second
reflective layer
13, and finally exited from the light-exiting surface 112 of the light-
transmitting
layer 11, making the light of the light strip more uniform and improving the
decoration and lighting effect of the light strip.
[00047] The above disclosure is only a preferred embodiment of the present
invention, and of course, the scope of the present invention is not limited
thereto,
and thus equivalent changes made in accordance with the claims of the present
invention are still within the scope of the present invention.
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