TW201407098A - Lighting device - Google Patents

Abstract

A lighting device includes a light guide stick, a light source, and a reflecting unit. The light guide stick extends along a first direction, and the light guide stick has a light emitting surface. The light source is disposed on a first edge of the light guide stick along the first direction. The light source is employed to provide at least a light beam entering the light guide stick. The reflecting unit is disposed on a second edge opposite to the first edge of the light guide stick along the first direction. The reflecting unit has a light receiving surface. The reflecting unit includes a plurality of microstructures disposed on the light receiving surface. The microstructures are employed to reflect an incident light beam back to the light guide stick.

Description

Lighting device

The present invention relates to a lighting device, and more particularly to a single-side light-integrating lighting device that utilizes a reflective member having a microstructure to enhance light extraction efficiency.

Light-emitting diodes have been used in traffic signals, general lighting facilities, and illumination sources for various electronic products due to their low power consumption, long component life, and low driving voltage.

Please refer to Figure 1 and Figure 2. 1 and 2 illustrate schematic views of a conventional single-sided light-emitting diode illumination device. As shown in FIG. 1, the conventional single-sided light-emitting diode illumination device 100 includes a light guide bar 110, a light-emitting diode light source 120, and a reflective layer 110R. The light emitting diode light source 120 is disposed at one end of the light guiding rod 110 in a first direction X, and the light generated by the light emitting diode light source 120 is transmitted to the light guiding rod 110 by the light guiding rod 110 having the light guiding property. In each region, the light is reflected to the light exiting surface 110S by the reflective layer 110R disposed in the light guiding rod 110. Therefore, a wide range of lighting effects can be generated by one-side light input.

However, when the length of the light guiding rod 110 is short, since the relative light guiding distance is also short, part of the angle light generated by the light emitting diode light source 120 (for example, the light L1 and the light in FIG. 1) L2) will not be able to smoothly guide the light exit surface 110S, resulting in a decrease in overall light extraction efficiency. Therefore, as shown in FIG. 2, the conventional single-sided light-emitting diode illumination device 101 may further include a reflection sheet 130 disposed at the end of the light guide bar 110. The end is used to reflect the light originally exposed by the tail end of the light guiding rod 110 back into the light guiding rod 110. However, since the conventional reflection sheet 130 is a planar reflection sheet, some light having a small incident angle (for example, the light L3 in FIG. 2) is reflected by the reflection sheet 130 back to the light guide rod 110, and cannot be guided to the reflection layer. The 110R or the light exiting surface 110S is therefore limited in the improvement of the overall light extraction efficiency.

One of the main objects of the present invention is to provide a lighting device. The light reflecting element with the microstructure is disposed opposite to the light source of the single side light, so that the light incident on the light reflecting element produces a scattered reflection effect, thereby improving the light extraction efficiency of the illumination device as a whole.

In order to achieve the above object, a preferred embodiment of the present invention provides a lighting device including a light guiding rod, a light source and a light reflecting element. The light guiding rod extends in a first direction and has a light emitting surface. The light source is disposed at a first end of the light guide bar in the first direction for providing at least one light into the light guide bar. The retroreflective element is disposed in the first direction relative to the second end of the first end of the light guide bar. The light reflecting element has a light receiving surface facing the light source. The retroreflective element includes a plurality of microstructures disposed on the light receiving surface for directing light incident to the light reflecting element back to the light guiding rod.

The present invention will be described in detail with reference to the preferred embodiments of the invention,

As shown in FIG. 3, the lighting device 200 of the first preferred embodiment of the present invention includes A light guide 210, a light source 220 and a light reflecting element 230 are included. The light guiding rod 210 extends along a first direction X and has a light emitting surface 210S. The light guide bar 210 of the present embodiment may preferably include a material having a light-conducting property such as a quartz material, a plastic material or an optical fiber material, but is not limited thereto. The light source 220 is disposed at a first end E1 of the light guiding rod 210 in the first direction X for providing at least one light into the light guiding rod 210. The light source 220 of the present embodiment may preferably include a light emitting diode (LED), but the invention is not limited thereto, and other types of light sources may be used as needed in other preferred embodiments of the present invention. For example, a cold cathode fluorescent lamp (CCFL) light source. The retroreflective element 230 is disposed in the first direction X of the light guiding rod 210 relative to the second end E2 of the first end E1. The light reflecting element 230 has a light receiving surface 230R facing the light source 220. In addition, the light reflecting element 230 includes a plurality of microstructures 230M disposed on the light receiving surface 230R for guiding the light incident to the light reflecting element 230 back to the light guiding rod 210. In addition, the illumination device 200 of the present embodiment may further include a reflective layer 210R disposed in the light guide bar 210 for reflecting the light entering the light guide bar 210, but is not limited thereto.

It is further explained that the microstructure 230M of the embodiment can be used to make the light incident on the retroreflective element 230 produce a more scattered reflection effect, thereby improving the light extraction efficiency of the illumination device 200 as a whole. For example, as shown in FIG. 3, the light source L4 and the light ray L5 entering the light guiding rod 220 are generated by the light source 220. Although the incident angle is small when it is incident on the light reflecting element 230, the light receiving surface of the light reflecting element 230 is small. The microstructure 230M is disposed on the 230R, so that the light L4 can be guided to the reflective layer 210 and further guided to the light exit surface 210 of the light guide bar 210. In addition, the light L5 can also be directly guided by the microstructure 230M to the light exit surface 210S of the light guide bar 210. That is, the microstructure 230M of this embodiment The incident light of a small angle can be reflected to form a reflected light with a larger angle, and the incident light is prevented from being directly reflected back to the light source 220, so that the light extraction efficiency of the illumination device 200 can be effectively improved. In addition, it should be noted that the retroreflective element 230 of the present embodiment preferably includes a reflective sleeve for covering the light guide bar 210 in the first direction X and in a second direction Y different from the first direction X. The second end E2 is used to achieve a better reflective effect, but is not limited thereto. The first direction X of the embodiment is substantially perpendicular to the second direction Y, but is not limited thereto. For example, when the second end E2 of the light guiding rod 210 has a tapered structure, the light reflecting element 230 may also cover the light guiding rod 210 in the first direction X and other directions different from the first direction X. Two-end E2. In addition, the microstructure 230M on the retroreflective element 230 may only partially contact the second end E2 of the light guiding rod 210 or may closely bond the microstructure 230M to the light guiding rod 210 to avoid affecting the reflective element 230 due to the presence of the gap. The resulting optical effect.

As shown in FIG. 4, each of the microstructures 230M of the present embodiment may preferably be a V-cut microstructure, but the invention is not limited thereto but is further preferred embodiments of the present invention. Other microstructures that can scatter reflected light can also be used in the examples. For example, as shown in FIG. 5, in the second preferred embodiment of the present invention, the reflective element 231 may include a plurality of microstructures 231M disposed on the light receiving surface 230R, and each of the microstructures 231M may be a conical shape. microstructure. In addition, as shown in FIG. 6, the microstructures 230M and the microstructures 231M described above may have an apex angle T, respectively. The apex angle T may be substantially between 100 degrees and 160 degrees, and the apex angle T is preferably between 120 degrees and 140 degrees, thereby achieving the desired reflective effect, but is not limited thereto. Please also note that as shown in FIGS. 4 and 5, the retroreflective element 230 and the retroreflective element 231 are preferably a circular reflective sleeve, respectively. In other words, the light guiding rod 210 in FIG. 3 is preferably a cylindrical light guiding rod in the first direction. The X extension, but the invention is not limited thereto, and it is possible to use different shapes of light guide bars as needed.

As shown in FIG. 7 to FIG. 9, in the third preferred embodiment, the fourth preferred embodiment, and the fifth preferred embodiment of the present invention, the reflective component 232, the reflective component 233, and the reflective component 234 can be respectively The plurality of microstructures 232M, the plurality of microstructures 233M, and the plurality of microstructures 234M are disposed on the light receiving surface 230R. Each of the microstructures 232M may be an R-cut microstructure, each of the microstructures 233M may be a spherical microstructure, and each of the microstructures 234M may be a conical microstructure or a polygonal microstructure, but the present invention The microstructure is not limited to the various shapes described above, and other irregular microstructures that dissipate the reflected light may be used.

In summary, the illuminating device of the present invention uses a reflective element having a microstructure to be disposed opposite to a light source that is unilaterally incident, so that the light incident on the illuminating element produces a scattered reflection effect, thereby avoiding direct light incident on the illuminating element. It is reflected back to the light source, so that the overall light extraction efficiency of the illumination device can be effectively improved.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100‧‧‧Lighting device

101‧‧‧Lighting device

110‧‧‧Light guide rod

110R‧‧‧reflective layer

110S‧‧‧Glossy

120‧‧‧Lighting diode source

130‧‧‧reflector

200‧‧‧Lighting device

210‧‧‧Light guide rod

210R‧‧‧reflective layer

210S‧‧‧Glossy surface

220‧‧‧Light source

230‧‧‧Reflective components

230M‧‧‧Microstructure

230R‧‧‧Glossy surface

231‧‧‧Reflective components

231M‧‧‧Microstructure

232‧‧‧Reflective components

232M‧‧‧Microstructure

233‧‧‧Reflective components

233M‧‧‧Microstructure

234‧‧‧Reflective components

234M‧‧‧Microstructure

E1‧‧‧ first end

E2‧‧‧ second end

L1‧‧‧Light

L2‧‧‧Light

L3‧‧‧Light

L4‧‧‧Light

L5‧‧‧Light

T‧‧‧ top angle

X‧‧‧ first direction

Y‧‧‧second direction

1 and 2 illustrate schematic views of a conventional single-sided light-emitting diode illumination device.

Figure 3 is a schematic view of a lighting device in accordance with a first preferred embodiment of the present invention.

Figure 4 is a schematic view of a retroreflective element of a first preferred embodiment of the present invention.

5 and 6 illustrate schematic views of a retroreflective element of a second preferred embodiment of the present invention.

Figure 7 is a partial schematic view of a retroreflective element of a third preferred embodiment of the present invention.

Figure 8 is a partial schematic view of a retroreflective element of a fourth preferred embodiment of the present invention.

Figure 9 is a partial schematic view showing a retroreflective element of a fifth preferred embodiment of the present invention.

200‧‧‧Lighting device

210‧‧‧Light guide rod

210R‧‧‧reflective layer

210S‧‧‧Glossy surface

220‧‧‧Light source

230‧‧‧Reflective components

230M‧‧‧Microstructure

230R‧‧‧Glossy surface

E1‧‧‧ first end

E2‧‧‧ second end

L4‧‧‧Light

L5‧‧‧Light

X‧‧‧ first direction

Y‧‧‧second direction

Claims (8)

A lighting device includes: a light guiding rod extending along a first direction, and the light guiding rod has a light emitting surface; a light source disposed at a first end of the light guiding rod in the first direction, Providing at least one light into the light guiding rod; and a light reflecting element disposed in the first direction relative to the second end of the first end, wherein the light reflecting element has a light receiving surface The light source, and the light reflecting element comprises a plurality of microstructures disposed on the light receiving surface for guiding light incident to the light reflecting element back to the light guiding rod. The illumination device of claim 1, wherein each of the microstructures comprises a V-cut microstructure or a conical microstructure. The illumination device of claim 2, wherein each of the microstructures has an apex angle substantially between 100 degrees and 160 degrees. The illumination device of claim 1, wherein each of the microstructures comprises a spherical microstructure, a polygonal microstructure, an R-cut microstructure or an irregular microstructure. The illuminating device of claim 1, wherein the light reflecting element comprises a reflective sleeve, the reflective sleeve is wrapped in the first direction and in a second direction different from the first direction The second end. The illuminating device of claim 1, further comprising a reflective layer disposed in the light guiding rod, the microstructures for guiding the light incident to the light reflecting element to the reflective layer. The illuminating device of claim 1, wherein the microstructures are used to direct the light incident to the light reflecting element to the light emitting surface of the light guiding rod. The lighting device of claim 1, wherein the light source comprises a light emitting diode (LED).