TWI713895B - Illumination device - Google Patents

Abstract

An illumination device includes a lamp and a light shielding hood. The lamp has a front lamp cover with a light exit surface. The light shielding hood at least partially covers the light exit surface for reducing the light energy emitted by the lamp, and the transmittance of the light shielding hood is less than a predetermined value.

Description

Lighting device

The present invention relates to a lighting device, and more particularly to a lighting device with a light shield.

Lighting devices used for night lighting, such as street lamps, wall lamps, or outdoor searchlights, can be installed on sidewalks, roads, or buildings. Taking street lamps as an example, according to different road conditions, it is necessary to adjust the illumination light type, light intensity and color temperature of street lamps to meet market demand. For example, for the same street light, the light in some illuminated areas should be strong to improve visibility; the light in the other illuminated areas should be weak to reduce brightness.

Therefore, how to design technical means that can adjust the lighting conditions without changing the appearance of the lamp to meet market needs is a problem that the industry wants to solve.

The present invention relates to a lighting device, which can at least partially cover the light-emitting surface with a light-shading cover to achieve different lighting effects.

According to one aspect of the present invention, a lighting device is provided, which includes a lamp and a light shield. The lamp has a front lamp cover, The front lamp cover has a light emitting surface. The light-shielding cover at least partially covers the light-emitting surface to reduce the light energy emitted by the lamp, and the transmittance of the light-shielding cover is less than a preset value.

In order to have a better understanding of the above and other aspects of the present invention, the following specific examples are given in conjunction with the accompanying drawings to describe in detail as follows:

100: lighting device

110: lamps

111: around

112: Front lamp shade

113: Glossy surface

120: hood

121: Around

122: shell

123: Dye

124: Soft light microstructure

125: Cylindrical lens

126: Nano coating

127: Semicircular lens

F: The first light-emitting area

R: second light zone

M: Central light emitting area

O: opening

S1: inner surface

S2: outer surface

L, L1, L2: light

1A and 1B are schematic diagrams of the light shield of the lighting device according to an embodiment of the invention before and after assembly.

Figure 2 is a schematic diagram of a lighting device according to another embodiment of the invention.

FIG. 3 is a schematic diagram of a lighting device according to another embodiment of the invention.

FIG. 4 is a schematic cross-sectional view of the lighting device in the X-Z plane according to an embodiment of the present invention.

Figure 5 shows a schematic diagram of light passing through the soft light microstructure.

FIG. 6 is a schematic diagram of a soft-light microstructure in an X-Y plane according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of a soft light microstructure according to another embodiment of the invention.

The following examples are provided for detailed description. The examples are only used as examples for description, and are not intended to limit the scope of the present invention. In the following description, the same/similar symbols represent the same/similar elements.

Please refer to the lighting device 100 in FIGS. 1A and 1B, which includes a lamp 110 and a light shield 120. The lamp 110 has a front lampshade 112 and a light emitting The element 114 and the front lamp cover 112 have a light emitting surface 113. The light-shielding cover 120 at least partially covers the light-emitting surface 113 to reduce the light energy emitted by the lamp 110 or filter a part of the light waveband so that the light transmittance of the light-shielding cover 120 is less than a preset value. Generally speaking, the light-emitting element 114 is disposed in the lamp 110 and protected by the front light cover 112, and the light-emitting element 114 is usually away from the front light cover 112. The light-emitting element 114 is, for example, a light-emitting diode array element or other light-emitting source.

In an embodiment, the periphery 121 of the light shield 120 and the periphery 111 of the lamp 110 are correspondingly engaged, and the light shield 120 can be fixed on the lamp 110 in a locking or clamping manner. Or in some embodiments, the inner surface S1 of the light shield 120 can be joined with the light-emitting surface 113 of the headlight cover 112, for example, the inner surface S1 can be fixed on the light-emitting surface 113 by means of glue, and then attached by vacuum. The way makes the inner surface S1 adhere to the light exit surface 113. Preferably, the light shield 120 and the front light cover 112 are completely sealed, and more preferably, the light shield 120 and the front light cover 112 are completely attached to prevent moisture from entering and remaining therein.

The shading cover 120 is, for example, an arched arc structure, which can match the shape (for example, an arc) of the front lamp cover 112 so that the shape of the shading cover 120 and the shape of the light exit surface 113 of the covered front lamp cover 112 match each other. In addition, in another unillustrated embodiment, the light shield 120 is, for example, a flat plate structure to match the shape of the front lamp cover 112 (for example, a plane type).

In one embodiment, the light-shielding cover 120 covers the corresponding part of the light-emitting surface 113 according to the lighting area to be improved, for example, covering the front, rear, or front and rear of the light-emitting surface 113 to reduce the light-emitting surface 113 Front and/or rear Part of the emitted light energy or filter part of the light band. As shown in FIG. 1B, the light-shielding cover 120 covers a first light-emitting area F located in front of the light-emitting surface 113. As shown in FIG. 2, the light-shielding cover 120 covers a second light-emitting area R located behind the light-emitting surface 113. As shown in Figure 3, the light shield 120 has an opening O in the center, which is opposite to the central light exit area M of the lamp 110. The light shield 120 covers the first light exit area F and the second light exit area located at the front and rear of the light exit surface 113 R, where the first light-emitting area F and the second light-emitting area R are located on opposite sides of the central light-emitting area M of the lamp 110. In addition, the light shield 120 can also completely cover the light exit surface 113 (as shown in FIG. 4). Therefore, the light shield 120 can adjust the area covering the light exit surface 113 according to the bright conditions.

As shown in Figures 1B, 2 or 3, after the lamp 110 uses the hood 120, the light output from the front and/or back of the lamp 110 can be less than the light output from the center of the lamp 110, so the center of the lamp 110 has the highest brightness to improve the road surface In addition, the front and/or rear brightness of the lamp 110 is relatively low, which can reduce light damage or prevent stray light from directly entering human eyes and causing direct glare. In addition, the light-shielding cover 120 is made of a light-transmitting material instead of a metal light-shielding cover or a highly reflective material, so it can avoid reflecting light, and can prevent part of the light energy from being reflected into the lamp 110 and converted into heat energy and then accumulated in the lamp 110. It causes high temperature and affects the performance of the lamp 110.

In an embodiment, the ratio of the area of the light-shielding mask 120 covering the light-emitting surface 113 is, for example, between 5% and 100%, preferably between 30% and 80%, more preferably between 40% and 60%, depending on Adjust the ratio according to the situation. In addition, the light-shielding cover 120 covers the area of the first light-emitting area F of the light-emitting surface 113 and the area of the second light-emitting area R may be the same or different. For example, the light-shielding cover 120 covers the first light-emitting area F of the light-emitting surface 113. The area may be larger or smaller than the area of the second light exit region R of the light exit surface 113 covered by the light shield 120, so as to adjust the light exit type of the lighting device 100.

In an embodiment according to the present invention, the light shield includes a housing and a dye. The shell is made of a transparent material, and the shell has an inner surface and an outer surface opposite to each other. The dye is located in the shell, so that the transmittance of the light shield is less than a preset value. In an embodiment, the housing 122 is made of, for example, a polymer material, which includes polycarbonate (PC), poly(methyl methacrylate) (PMMA), and polymerized siloxanes. , Commonly known as silicone, polystyrene (Polystyrene, PS), polypropylene (Polypropylene, PP), polyethylene (polyethylene, PE) and acrylonitrile butadiene styrene (Acrylonitrile Butadine Styrene, ABS) at least one polymer material. The shell 122 can be recycled and reused. The hardness of the housing 122 is, for example, between 85-95 Rockwell hardness.

In the light shield 120 of this embodiment, a dye 123 is added to the housing 122 to make the light transmittance of the light shield 120 less than a preset value, for example, between 50% and 95%. In other words, the light shield 120 can block part of the light or filter out part of the light waveband by adding the dye 123, so that the light transmittance of the light shield 120 is less than a predetermined value. The light transmittance of the light shield 120 is negatively correlated with the concentration of the added dye 123. When the concentration of the added dye 123 increases, the light transmittance of the light shield 120 relatively decreases. In one embodiment, the concentration percentage of the dye 123 in the housing 122 is, for example, less than or equal to 4%, and greater than or equal to 0%, but the concentration of the dye 123 in the housing 122 can be adjusted according to specific conditions and is not limited to less than or equal to 4%. . In addition, the dye 123 in the housing 122 has a concentration change 化. For example, the concentration of the dye 123 may decrease from the periphery of the housing 122 to its center, so that the transmittance of the housing 122 increases/decreases sequentially from the periphery of the housing 122 to the center, or it may move in one direction (for example, up and down or left and right). ) Increasing/decreasing, that is, the transmittance of a certain area of the light shield 120 can be made higher to maintain high illuminance, but the transmittance of other areas can be made lower to reduce light damage.

In the present invention, the color of dye 123 is not limited, and the component of dye 123 may be an organic compound, such as (2-[[5-(2,4-dichlorophenyl)furan-2-yl]methylene] -5-(4-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-ethyl carboxylate), ethyl 2 -[[5-(2,4-dichlorophenyl)furan-2-yl]methylidene]-5-(4-methoxyphenyl)-7-methyl-3-oxo-5H-[1,3]thiazolo[3,2- a]pyrimidine-6-carboxylate.

In addition, the outer surface S2 of the light shield 120 is, for example, a smooth surface, so as to prevent contaminants from adhering to the outer surface S2 of the light shield 120. In order to increase the anti-fouling effect, a nano-coating 126 can be formed on the outer surface S2 of the housing 122 (see FIG. 4). The nano-coating 126 can effectively isolate the oily and non-oily particulate pollutants of PM2.5 grade, and achieve the effect of anti-fouling and the outer surface S2 is not easy to adhere to the pollutants. In one embodiment, the nano-coating 126 may be a nano-titanium dioxide-silica photocatalyst film, which can effectively decompose organic matter.

In addition to changing the light transmittance of the light shield 120 by the dye 123, the inner surface S1 of the housing 122 of the light shield 120 has, for example, a soft light microstructure 124, which can change the light output angle. Please refer to FIG. 4, the soft light microstructure 124 is, for example, a lens array, which is integrally formed on the inner surface S1 of the housing 122. In addition, in some embodiments, the inner surface S1 is adjacent to the light emitting surface 113 of the headlight cover 112 and is separated by a distance, so that air can circulate in the gap to promote heat dissipation. In the present invention, the width of the gap is preferably smaller than the thickness of the light shield to prevent foreign objects from flying into the gap and remaining therein.

Please refer to Fig. 5, after the light L1 passes through the soft light microstructure 124, the light exit angle is changed, so that the light L1 advances in different directions and becomes divergent light L2. Therefore, in Fig. 4, the light L of the light-emitting element 114 is in the X-axis direction The light emitting angle on the upper side becomes larger and the light is emitted uniformly to improve the uniformity.

Referring to FIGS. 5 and 6, in an embodiment, the soft light microstructure 124 includes a plurality of cylindrical lenses 125, the length of which extends along the inner surface S1, and the cylindrical lenses 125 are located in the short axis direction of the lamp 110 (ie It is elongated in the Y-axis direction and arranged in parallel in the long-axis direction of the lamp 110 (ie, the X-axis direction). Referring to FIG. 7, in another embodiment, the soft light microstructure 124 includes, for example, a plurality of semicircular lenses 127 arranged on the inner surface S1 of the housing 122 to achieve the effect of atomization or uniform light emission.

In summary, although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Those who have ordinary knowledge in the technical field to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to those defined by the attached patent application scope.

100: lighting device

110: lamps

111: around

112: Front lamp shade

113: Glossy surface

114: light-emitting element

120: hood

121: Around the hood

122: shell

123: Dye

F: The first light-emitting area

R: second light zone

M: Central light emitting area

S1: inner surface

S2: outer surface

Claims (12)

A lighting device includes: a lamp with a front lampshade, the front lampshade has a light-exiting surface; and a light-shielding cover at least partially covering the light-exiting surface to reduce the light energy emitted by the lamp, and the light transmission of the light-shielding cover The degree is less than a preset value, wherein the shading cover includes: a shell made of a light-transmitting material, the shell having an inner surface and an outer surface opposite to each other; and a dye located in the shell, wherein the The concentration of the dye in the shell decreases in one direction. According to the lighting device described in item 1 of the scope of patent application, the light transmittance of the light shield is less than the light transmittance of the front lamp cover. In the lighting device described in item 1 of the scope of patent application, the light transmittance of the light shield is 50% to 95%. As for the lighting device described in item 1 of the scope of patent application, the area of the light-emitting surface covered by the light-shielding cover is more than 5%. In the lighting device described in item 1 of the scope of patent application, the concentration of the dye is between 0% and 4%. The lighting device described in the first item of the scope of patent application, wherein the inner surface has a soft light microstructure. According to the lighting device described in item 6 of the scope of patent application, the soft light microstructure includes a plurality of cylindrical lenses arranged in parallel, and the length of the cylindrical lenses extends along the inner surface. The lighting device described in item 1 of the scope of patent application further includes a nano-coating formed on the outer surface of the housing. The lighting device described in item 1 of the scope of patent application, wherein the inner surface and the light emitting surface are adjacent and separated by a distance. In the lighting device described in item 9 of the scope of patent application, the gap width is smaller than the thickness of the light shield. The lighting device described in item 1 of the scope of patent application, wherein the light shield is joined to the headlight cover. The lighting device described in item 1 of the scope of patent application, wherein the light shield and the front lamp cover are completely sealed.

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