WO2009067844A1

WO2009067844A1 - A light emitting diode illuminator

Info

Publication number: WO2009067844A1
Application number: PCT/CN2007/003360
Authority: WO
Inventors: Chihua Shieh
Original assignee: Chihua Shieh
Priority date: 2007-11-28
Filing date: 2007-11-28
Publication date: 2009-06-04

Abstract

A light emitting diode (100), comprises a light source (110) and a first lamp housing (120) accommodating the light source (110). The light rays produced by the light source (110) are reflected at least once and then sent out by the first lamp housing (120). The light source (110) is an array composed of a plurality of light emitting diodes.

Description

IP070120

LED lighting device

Technical field

The invention relates to a lighting device, in particular to an LED lighting device. Background technique

A light emitting diode is a special kind of diode. Like ordinary diodes, light-emitting diodes are composed of semiconductor chips which are previously subjected to processes such as implantation or doping to produce a PN junction structure. Like other diodes, the current in the LED can easily flow from the P-pole (positive) to the N-pole (negative), but not in the opposite direction. Two different carriers: Holes and electrons flow from the electrode to the PN under different electrode voltages. When the holes and electrons meet, they release energy in the form of photons. When the applied voltage of the PN junction is positive, a large current flows, which is called a positive bias. If the voltage polarity is reversed, then it is called reverse bias, when only a small current flows through the device and does not illuminate.

Because LEDs last longer than traditional lighting bulbs, LEDs are currently being actively developed for use in a variety of lighting applications, but also because LEDs are much more efficient than traditional lighting such as incandescent bulbs and household tungsten lamps. The light bulb is easy to produce glare when it is illuminated. The glare is what the average person calls the blinking light, that is, the glare of the eye when the light is directly viewed from the light source (direct glare), and the glare that is reflected by the light to the eye (indirect glare). Or indoor main lamp and table lamp light and dark ratio is too large (contrast glare).

The existence of glare makes the human eye unable to see the surrounding objects, blurring the image, reading hard, easily causing eye fatigue, reducing reading efficiency, thus causing eye burden, causing sore eyes and headaches, thus reducing work performance and work quality. It even affects safety. Even with the backlighting technology used on LCD displays to reduce the generation of glare, some of the light is directed out of the illumination device, and glare due to the intense brightness of the direct light cannot be avoided. Summary of the invention

In view of the above-described background of the invention, in order to meet the needs of certain industrial interests, the present invention provides a lighting diode lighting device that can be used to solve the problems that the conventional lighting device fails to achieve.

It is an object of the present invention to provide an LED lighting device. The LED lighting device comprises a first lamp cover, the first lamp cover is covered with a light source, and the light generated by the light source is at least one time through the inside of the first lamp cover. IP070120

After the shooting, the first lampshade is illuminated, wherein the light source comprises a plurality of light emitting diodes and a power source, and the plurality of light emitting diodes are arranged in an array, and the plurality of light emitting diodes are electrically coupled to the power source to achieve a positive bias.

The first lamp cover comprises an opening portion, a reflecting portion and a shielding portion, wherein at least one opening portion is located between the shielding portion and the reflecting portion. The light generated by the light source is irradiated with the first lamp cover through the opening portion, and the reflecting portion is an arc-shaped structure. The arc-shaped structure includes a convex surface and a concave surface, and the light generated by the light source is reflected by the concave surface at least once. At least one opening. The shielding portion reflects the direct light that is directly emitted by the light source to the at least one opening portion, and reflects the direct light to the reflecting portion, so that all the light generated by the light source can be reflected at least once to prevent the light from directly emitting the first lampshade. This can enhance the prevention of glare.

In order to enhance the brightness of the illumination, the above-mentioned LED lighting device further comprises a second lampshade, wherein the second lampshade has the same structure as the first lampshade, and the second lampshade is symmetrically arranged with the first lampshade. DRAWINGS

The above and other objects, features and advantages of the present invention will become more <RTIgt;

1 is a schematic structural view of an LED lighting device;

2A, 2B, 3 and 4 are schematic structural views of a reflecting portion;

Figure 5 is a schematic view showing the structure of the protruding portion;

6 and FIG. 7 are schematic structural views of a light-emitting diode illumination device arranged symmetrically;

8 is a schematic view showing a relationship in which a direction in which a light source and an opening portion are orthogonal to each other;

Figure 9 is a schematic view showing the relationship between the light source and the opening in the opposite direction;

Figure 10 is a schematic structural view of an LED lighting device having a protective layer;

Figure 1 is a schematic structural view of a plurality of light emitting diodes arranged in a line array;

Figure 12 is a light distribution diagram of the illuminating device for symmetrical arrangement;

Figure 13 is a schematic view of the structure of the cylindrical lampshade. detailed description

The direction of the invention discussed herein is an LED lighting device. In order to thoroughly understand the present invention, detailed steps and compositions thereof will be set forth in the following description. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art of LED lighting devices. On the other hand, well-known components or steps are not described in detail to avoid unnecessarily limiting the invention. The preferred embodiment of the present invention will be described in detail below, however IP070120

The present invention may be widely practiced in other embodiments, and the scope of the present invention is not limited by the scope of the invention.

Referring to FIG. 1 , an embodiment of the present invention discloses an LED lighting device 100 , which includes a first lamp cover 120 , wherein the first lamp cover 120 is coated with a light source 1 1 0 . And the light generated by the light source 110 is illuminated at least once inside the first lampshade 120 to illuminate the first lampshade 120 to achieve the purpose of reducing glare, wherein the light source 1 10 is illuminated by a plurality of lights The diodes are composed, and a plurality of light emitting diodes are arranged in an array, such as a linear array, an arc array, a rectangular array, and the like.

The first lamp cover includes at least one opening portion 1 2 2, a reflection portion 1 2 4 and a shielding portion 1 2 6 , wherein the at least one opening portion 1 2 2 is located at the shielding portion 1 26 and the reflection portion 1 2 Between 4. As shown in Fig. 1, the light generated by the light source 110 is at least once reflected by the reflecting portion 1 2 4 and reaches at least one opening 1 2 2, and the first lamp cover 120 is illuminated, as indicated by a solid arrow. The shielding portion reflects the direct light that is directly incident on the at least one opening portion 1 2 2 by the light source 110, and reflects the direct light to the reflecting portion 1 2 4 as indicated by the dotted arrow, so that the light source 1 1 can be All the light generated by 0 is reflected at least once, so as to prevent the light from directly emitting the first lampshade 120, and thus it is possible to enhance the prevention of glare.

In order to easily reflect the light to at least one of the openings 1 2 2, the above-mentioned reflecting portion 1 2 4 may be an arc structure (as shown in FIG. 1 ), a bevel structure ( FIG. 2 A ), and a sawtooth structure (as shown in the figure). 2 B), wave structure (as shown in Figure 3), even irregular structure (Figure 4), or other special structure that can reflect light to at least one opening 1 2 2, can equally replace the reflection of the present invention The portion 1 2 4 , and the present invention exemplifies the LED lighting device 100 having the curved structure reflecting portion 1 2 4 as a preferred embodiment. As shown in FIG. 1 , the above-mentioned reflecting portion 1 24 is an arc-shaped structure, and the arc-shaped structure includes a convex surface 1 28 and a concave surface 1 3 0 , wherein the light generated by the light source 110 is via The concave surface 1 3 反射 reflects at least once and reaches at least one opening portion 1 2 2 .

In addition, the reflecting portion 1 2 4 further includes a protruding portion 1 3 2 , wherein the protruding portion 1 3 2 is a portion where the reflecting portion 1 2 4 protrudes adjacent to the at least one mouth portion 1 2 2 , as shown in the figure. 5 is shown. The protrusion 1 3 2 can increase the effective range of the reflection portion 1 2 4 , and can ensure that the light generated by the light source 110 can pass through at least one reflection to illuminate the lamp cover 120.

Furthermore, the above-mentioned LED lighting device 100 may further include a second lamp cover 160 to enhance the illumination brightness, wherein the second lamp cover 160 is of the same structure as the first lamp cover 120, and the second lamp cover 1 2 0 is symmetrically arranged with the first lampshade 140, such as the mouth portion 1 2 2 of the first lampshade 120 is adjacent to the opening of the second lampshade 120 (Fig. 6), the first lampshade The opening portion 1 2 2 of 1 2 0 is opposite to the opening portion of the second lampshade 120 (Fig. 7) and the like. IP070120

As shown in FIG. 8, the irradiation direction of the light source 110 may be perpendicular to the irradiation direction of at least one of the openings 1 2 2, or may be opposite to the irradiation direction of at least one of the mouth portions 1 2 2 as shown in the figure. 9 is shown. The at least one opening portion is an internal structure that can cover the protective layer 150 to protect the LED lighting device 100, and the protective layer 150 can be a diffusion plate to enhance the prevention of glare. , as shown in Figure 10.

As described above, the light source 110 is a plurality of light emitting diodes that can be arranged in a line array, as shown in FIG. Therefore, the LED lighting device 100 of the present invention can replace the conventional fluorescent lamp lighting device.

Referring to FIG. 6, when the opening portion 1 2 2 of the first lamp cover 120 is adjacent to the opening portion of the second lamp cover 120, the light can be used by the first lamp cover 120 and the second lamp cover 1 2 0 Convergence. From the data simulation, the distribution of light intensity and space after the light is concentrated by the above-mentioned lampshade arrangement can be known, as shown in Fig. 12. Of course, the light source of the lampshade arrangement is not limited to only one light emitting diode, and the light emitting diodes may be arranged in a linear array, and the first lampshade 1 2 Q and the second lampshade 120 may be in a columnar form to cover the wire type. The arranged LEDs are shown in Figure 13.

In 1939, Shuji Nakamura, who worked at Nichia Corporation in Japan, invented a real business based on wide-bandgap semiconductor materials (GaN) and indium nitride (InGaN). The application of blue light-emitting diodes, which have been widely used in the late 1990s. Theoretically, blue light-emitting diodes combined with existing red and green light-emitting diodes produce white light, but today's white light-emitting diodes are rarely produced in this way.

Most of the currently produced white light-emitting diodes are made by coating a layer of light yellow phosphor powder on a blue light-emitting diode (near-UV, wavelength from 450 to 47 nm). It is usually prepared by grinding yttrium-doped yttrium-aluminum-gallium (Ce ³ +:YAG) crystals into a powder and then mixing them in a dense binder. When the LED chip emits blue light, part of the blue light is efficiently converted by the crystal into a predominantly yellow light with a broad spectrum (about 580 nm in the center of the spectrum). (Actually, single crystal Ce-doped YAG is considered to be a scintillator more than a phosphor.) Since yellow light stimulates the red and green light in the naked eye, the blue light of the light-emitting diode itself is mixed, making it look like white. Light, its color is often called "white of moonlight." This method of making white light-emitting diodes was developed by Nichia Corporation and has been used in the production of white light-emitting diodes since 1996. To adjust the color of the pale yellow light, the cerium (Ce) incorporated in Ce ^3t :YAG may be replaced by other rare earth metal lanthanum or cerium, or even by replacing some or all of the aluminum in YAG.

Based on the characteristics of the spectrum, red and green objects appear to be less vivid when illuminated by such a light-emitting diode.

In addition, due to the fluctuation of the production process, the color temperature of the finished product of the light-emitting diode is not uniform, from warm yellow to cold blue, so the distinction will be made in the production process. IP070120

Another method of making white light-emitting diodes is similar to fluorescent lamps. Light-emitting diodes emitting near-ultraviolet light are coated with a mixture of two phosphors, one emitting red and blue light, and the other emitting green light. , copper and aluminum doped with zinc sulfide (ZnS). However, since the ultraviolet rays cause the epoxy resin in the adhesive to crack and deteriorate, the production is difficult and the life is short. Compared with the first method, it is less efficient and produces more heat (because Stokes Shift is larger), but the advantage is that the characteristics of the spectrum are better, and the light produced is better. Since the light-emitting diode of ultraviolet light is relatively low in power, the efficiency is lower than that of the first method, and the brightness is similar.

The latest method of making white light emitting diodes no longer uses phosphors. A new approach is to grow an epitaxial layer of zinc selenide on a zinc selenide (ZnSe) substrate. When energized, its active zone emits blue light and the substrate glows yellow, which is white light when mixed.

According to the light-emitting diodes of the above-mentioned plurality of colors, in combination with the LED lighting device proposed by the present invention, the LED lighting devices of various colors can be easily manufactured, and at the same time, the anti-glare effect can be achieved. Furthermore, in addition to the various color light-emitting diodes described above, the LED lighting device of the present invention can also be realized by various other light-emitting diodes, such as TAG, GE (General Electric), Internet ix and TG (Toyoda Gosei) developed by Osram Corporation. The light-emitting diodes developed by companies such as Silicate, or the light-emitting diodes developed by Nemoto with Nitride, etc., can be easily inferred by those skilled in the art, and the present invention will not be described again.

Obviously, many modifications and differences are possible in the present invention in light of the above description. It is therefore to be understood that within the scope of the appended claims, the invention may be The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the claims of the present invention; any equivalent changes or modifications made without departing from the spirit of the invention should be included in the present invention. Within the scope of the claims.

Claims

IP070120 Claims

A light-emitting diode lighting device, comprising: a light source, the light source comprising a plurality of light-emitting diodes, and the plurality of light-emitting diodes are arranged in an array; a first light cover, the first light cover Encapsulating the light source, and the light generated by the light source illuminates the first lamp cover through at least one opening of the first lamp cover, wherein the first lamp cover comprises:

a reflecting portion, the reflecting portion is an arc-shaped structure, the arc-shaped structure includes a convex surface and a concave surface, wherein the light generated by the light source is reflected by the concave surface at least once to reach the at least one mouth portion;

a shielding portion that reflects direct light that is directly incident on the at least one opening by the light source, and reflects the direct light to the reflecting portion, wherein the at least one opening portion is located at the shielding portion and the reflecting portion between.

2. The LED lighting device of claim 1, further comprising a second lampshade, the second lampshade having the same structure as the first lampshade, and the second lampshade being symmetrical to the first lampshade arrangement.

The LED lighting device according to claim 2, wherein the opening of the first lamp cover is adjacent to the opening of the second lamp cover.

The LED lighting device according to claim 2, wherein the opening of the first lamp cover is opposite to the opening of the second lamp cover.

5. The LED lighting device of claim 2, wherein the first lampshade and the second lampshade are a combination of a paraboloid and are discontinuous curves.

6. The LED lighting device of claim 5, wherein the first lamp cover and the second lamp cover are columnar.

7. The LED lighting device of claim 1, wherein the reflecting portion comprises a protruding portion, wherein the protruding portion is a portion of the reflecting portion protruding adjacent to the at least one opening portion.

The LED lighting device according to claim 1, wherein the illumination direction of the light source is perpendicular to an irradiation direction of the at least one opening.

9. The LED lighting device of claim 1, wherein the illumination direction of the light source is opposite to the illumination direction of the at least one mouth portion.

The LED lighting device of claim 1, wherein the at least one opening portion covers a protective layer.

1 . The LED lighting device according to claim 10, wherein: IP070120

The sheath is a diffuser.

1 . The LED lighting device, wherein the LED lighting device comprises: a light source, wherein the light source comprises a plurality of light emitting diodes;

a first lamp cover, the first lamp cover is coated with the light source, and the light generated by the light source illuminates the first lamp cover through at least one opening of the first lamp cover, the first lamp cover comprising:

a reflecting portion, the light generated by the light source is reflected by the reflecting portion at least once and reaches the at least one opening portion;

a shielding portion that reflects direct light that is directly directed toward the at least one mouth portion by the light source to the reflecting portion.

The LED lighting device of claim 12, further comprising a second lampshade, the second lampshade having the same structure as the first lampshade, and the second lampshade is The first lampshade is arranged symmetrically.

The LED lighting device according to claim 13, wherein the opening of the first lamp cover is adjacent to an opening of the second lamp cover.

The light-emitting diode lighting device according to claim 13, wherein the opening of the first lamp cover is opposite to the opening of the second lamp cover.

The LED lighting device of claim 13, wherein the first lamp cover and the second lamp cover are a combination of a paraboloid and i is a discontinuous curve.

The light-emitting diode lighting device according to claim 16, wherein the first lamp cover and the second lamp cover are columnar.

The light-emitting diode illumination device according to claim 12, wherein the reflecting portion is an arc-shaped structure, and the curved structure comprises a convex surface and a concave surface, wherein the light generated by the light source is The concave surface reflects at least once and reaches the at least one opening.

The LED lighting device according to claim 12, wherein the reflecting portion comprises a protruding portion, wherein the protruding portion is a portion of the reflecting portion that protrudes from the at least one opening.

The LED lighting device according to claim 12, wherein the illumination direction of the light source is perpendicular to an irradiation direction of the at least one opening.

The LED lighting device according to claim 12, wherein the illumination direction of the light source is opposite to the illumination direction of the at least one opening.

2. The LED lighting device of claim 12, wherein: IP070120

One less opening is covered by a protective layer.

2. The LED lighting device according to claim 2, wherein the protective layer is a diffusion plate.

The LED lighting device of claim 12, wherein the plurality of the plurality of light emitting diodes are arranged in an array.

The LED lighting device according to claim 12, wherein the reflecting portion is a bevel structure.