TWI245434B - White light mixer - Google Patents

Abstract

A white light mixer includes a carrier plate, three respective red, green and blue light-emitting diodes (LED), a lens, and a transparent layer. The LEDs are disposed on the carrier plate, the lens is disposed on top of the 3 light emitting diodes, and the transparent layer is filled in between each LED and the lens. The lens contains at least one bevel to define the illumination angular field of each LED. The bevel forms a fixed angle with the carrier plate, and part of illumination, which is far away from the center of lens and is irradiated from each LED to the bevel, is totally reflected to make the different LEDs generate a same angular field to obtain thorough light mixing.

Description

1245434 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a white light mixing device, and particularly to a light mixing device that uses red, green, and blue light to mix to produce white light. [Prior technology] Press, a light emitting diode (Light Emitted Diode, LED) is a kind of high-efficiency cold-light emitting element that can convert electric energy into light energy, and it is also a secret light source (s 0 1 idstatei 1 1 uminat. r). The main component of a light-emitting diode is a semiconductor p-n junction structure. After a voltage is applied to both ends of this interface to pass current, electrons and holes are generated to flow to this ρ-η interface, and they are combined to release photons. 〇Basic; h, the method of using a light-emitting diode to produce white light can be mainly distinguished from two. The first method is to use red and green diodes at the same time. Produces white light. The second method is to use fluorescent phosphor diode (Phosphor-LED), that is, to coat the blue light emitting diode material, to convert part of the blue light into larger waves (2, etc.), to produce white light. First, red first. In the above two methods, the method of using red, green, and blue to emit white light, because no fluorescent phosphor is needed, dt if is a c "" The corresponding light emitting device is also relatively simple. However, for the same type, we use &

Page 5 1245434 V. Description of the invention (2) The white light produced usually has the following disadvantages and needs. It is easy to reach the 2 ′ red, green, and blue three-color luminous intensity of the South-quality luminous intensity :; maintain a specific luminous intensity ratio, and mix: only to produce the ideal white light. Therefore, the number of diodes in this seat must be stupid in production, or by changing two: two changes: red, green, and blue light to adjust its brightness, and adjusting the red, green, and blue colors; source intensity to adjust the second, red The green and blue three-color light-emitting diode body looks like:-Generally speaking, the light-emitting diode can be seen as a radial divergence of uneven color. a to make the light-emitting diode of the light-emitting diode u light-emitting system is as follows: as shown in the figure-a common method 4 = direction; η ': medium' use-lens structure 16 condensing light-emitting diode 12 J seal I junction if it is This is done using multiple light emitting diodes of different colors. However, as shown in the two figures, since each light-emitting diode 12 is first 'as the first' each light-emitting diode body center, 12, the light is bright, the two are different, the angle covered by the shot I There are different,,. Miao: In the light of the lens structure 16, the diodes 2a, 12b, the overlapping parts are only, and the remaining non-overlapping parts of each post show each hair: there is a mixed color effect fir, which leads to Uneven color mixing. The original color of the body is how to provide a white light mixing device with the disadvantages of uneven color mixing of color light-emitting diodes to provide an explanation. ^ Service red, green and blue are the goals that the lighting industry is eager to pursue. 、 Q. The mixed light of scallops is the content of the invention

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Tellurium Ben :: The main purpose is to provide a white light mixed light package, which uses red, and two-color hair pre-diodes to mix light to produce white mixed light. Another object of the present invention is to provide a lens to overcome the disadvantage of uneven red-green emission mixing to provide high-quality white mixed light. One color The present invention provides a light mixing device including a carrier board, at least two light sources of the same color shirt, a lens and a light transmitting layer. ,, The light source is set on a carrier board, the lens is set above the light source, and the light-transmitting layer is filled between the light source and the lens. The lens has at least one inclined surface to define an angular field of the light source. In addition, the inclined plane is at a fixed angle with the carrier board, so that the light source is irradiated to the inclined plane of light through the light-transmitting layer, and the part of the illumination far from the center of the lens is totally reflected, so that different light sources have the same coverage angle and can be fully mixed. Light. The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings. Embodiments Please refer to the third diagrams A and B, which are schematic cross-sectional and top views of the first embodiment of the light mixing device of the present invention. As shown in FIG. 3A, the light mixing device 20 includes a carrier plate 22, two light sources S1, S2 of different colors, a lens 24, and a light transmitting layer 26. The light sources S1, S2 (such as light-emitting diodes) are provided on the carrier plate 22; the lens 24 is provided above the light sources S1, S2; and the light-transmitting layer 26 is filled between the light sources S1, S2 and the lens 24. Protect and fix light source S1 and

Page 7 1245434 V. Description of the invention (4) S2. The light-transmitting layer 26 may be made of epoxy (Ag) or silver (Ag) transflective-diffusion adhesive, and has a refractive index greater than that of the lens 24. As shown in FIG. 3A, the inner surface 24a of the lens 24 is a concave surface, and the outer surface 2 4b is used to condense the outer convex spherical surface. The edge of this concave surface 2 4 a has two oblique air 42 42, and please refer to FIG. 3B at the same time. This inclined surface '242 is curved around the central axis C of the lens 24. The convergent surface 242 is at a fixed angle a 1 with the carrier plate 22, and the light generated by the light sources S1 and S 2 is irradiated to the inclined surface 242 through the light-transmitting layer 26. Since the refractive index of the light-transmitting layer 26 is greater than the refractive index of the lens 24, f, by adjusting the angle al between the inclined surface 242 and the carrier plate 22, the light from the light sources S1, S2 to the inclined surface 242 can be partially reflected. In addition, in order to effectively utilize the light generated by the light sources S1 and S2, the upper surface of the carrier plate 22 has another reflective coating layer 2 2 2 to reflect the part of the light that is totally reflected by the inclined surface 242 to the lens 24 upward. Please refer to the third picture C, which shows the enlarged bevel 242 of the third picture A, and LI 1 and L21 in the picture refer to the partial reflection of total light, and L12 ~ · and L22 refer to the partial reflection of light , And L13 and L23 refer to light having an incident angle equal to the critical angle of the interface between the lens 24 and the light-transmitting layer 26. In addition, L11, ❶ L12, L13 represent the light from the light source S1, and L21, L22, L23 represent the light from the light source S2. As shown in the figure, the part of the light LI 1 and L21 far from the central axis C of the lens 24 has an incident angle greater than the critical angle (arbitrary angle, aa)) to generate total reflection. The reflective coating 2 22 is reflected to the lens 24 to provide,

Page 8 1245434 V. Description of the invention (5) High luminous efficiency of the light mixing device of the present invention. As for the part of the light L12 and L22 that produce refraction, after being refracted by this inclined surface 242, it is deflected away from the central axis C of the lens 24, and then passes out of the lens 242.

Basically, in the frequency range of visible light, the influence of the variation of the light wavelength on the refraction angle can usually be ignored. Therefore, the light sources S1 and S2 can be regarded as having the same critical angle aa, that is, L13 is parallel to L23. As for the light L1 2 and L22 with an incident angle smaller than aa, they can pass through the inclined surface 242 and be transmitted to the outside. It is worth noting that in the figure, 2 and 122 are taken as an example to illuminate the light at the upper edge 242a of the inclined surface. In fact, the light between L1 3 and L12 and between L23 and L22 can penetrate this inclined surface 242. The coverage angles generated by the light sources S1 and S2 are C1 and ㈡, respectively, that is, the angle between the refraction direction of the light L12 and L22 at the upper edge 242a of the inclined surface 242 and the surface of the inclined surface 242.

It can be seen that by properly adjusting the angle a 1 ′ between the inclined surface 242 and the carrier plate 22, the light provided by the light sources S 1 and S 2 to the inclined surface 24 is partially reflected, so that the lower edges of the coverage angles C1 and C2 can be made. Completely coincide. At the same time, since the inclined surface 242 is located at the edge of the lens 24 and bends around the central axis c ′ of the lens 24, as a whole, the inclined surface 242 defines the angle of coverage of the light source S1 and "the radiation to the outside through the lens 2, and Make the light source S1 and "generate the same coverage angle to fully mix the light. Although the two light sources S1 and S2 can achieve the same coverage angle, 疋 a due to the difference in the positions of the light sources S1 and S2, the uniformity of the light will be affected. In a preferred embodiment, the distance p between the two light sources si and 32 can be set to be less than 5% of the lens diameter D, so that the coverage angle C1 and the upper edge are as far as possible.

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Sin is near to provide high quality mixed color glow. It is worth noting that although the mixed light result of J Guangwan S2 is only shown in the first embodiment, it is not limited to this, the present invention = θ :: Γ S dead light source. To further illustrate, as shown in the fourth figure, 疋, using three light emitting diodes S1, S2, S3 of χ, 4 blue, for a preferred embodiment, and b, this red green blue three light emitting diodes The polar bodies 31, 32, and 33 are arranged in a regular triangle J on the carrier plate 22, and the light-emitting intensity of each color of red, green, and blue is appropriately adjusted to generate white light with this light. In addition, if three red light-emitting diodes are used, the light-emitting device of the present invention can make the light of the three light-emitting diodes effective.

Converge to improve the uniformity and intensity of the overall lighting.凊 Refer to the fifth diagrams A and B, which are schematic diagrams of the second embodiment of the light mixing device of the present invention, wherein the fifth diagram B is a top view of the fifth diagram a. Compared with the first embodiment ', this embodiment is provided with a plurality of inclined surfaces 342a, 342b, 342c on the inner surface 34a of the lens 34, and is arranged from the edge of the lens 34 toward the lens central axis C. Each of the inclined surfaces 342a, 342b, and 342c is curved around the central axis C of the lens, and is fixed at a fixed angle al, a2, a3 with the carrier plate 22, respectively. At the same time, the clips between each of the inclined surfaces 342a, 3 42b, 342c and the carrier plate 22 '-~ -------------..................-. ............ The angle system gradually follows the distance between the inclined planes 342a, 34jb, 342c and the central axis C of the lens.

Prepare I · ", that is, a 1 > a 2 > a 3. The purpose of setting a plurality of inclined surfaces 342a, 342b, 342c in this embodiment is to improve the uniformity of the illumination of the different light sources S1, S2, so as to provide more uniform mixed light. However, the greater the number of inclined planes, the more difficult and costly to make the puppet. Therefore, in consideration of the effect of mixing light and the cost of production, setting 5 to 15 slopes is a better choice.

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V. Description of Invention (7)

Please refer to the sixth diagrams A and B, which are schematic diagrams of the third embodiment of the light mixing device of the present invention, wherein the sixth diagram B is a top view of the light mixing device. Compared with the first embodiment, this embodiment is provided with a plurality of inclined surfaces 442 arranged end to end at the edge of the inner surface of the lens 44 to form a ring-shaped area surrounding the central axis C of the lens. It is worth noting that each of the inclined surfaces 442 is at the same angle al as the carrier plate 22, and the light sources SI, S2 illuminate the respective light surfaces of the inclined surfaces 4 4 2 with partial reflection.

Please refer to the seventh diagram A and B, which is a schematic diagram of the fourth embodiment of the light mixing device of the present invention, wherein the seventh diagram B is a top view of the light mixing device. In comparison with the first embodiment, the inclined surface 242 is provided on the inner surface 24a of the lens. In this embodiment, the inclined surface 542 is provided on the outer surface of the lens 54 and the inner surface of the lens 54 is a concave spherical surface. The inclined surface 542 and the carrier plate 22 have a fixed angle b '. At the same time, the two light sources 31, S2 illuminate the illumination of the inclined surface 542. The incident angle of the part of the light far away from the central axis C of the lens is greater than the critical angle and is totally reflected. It is deflected by the refraction of this inclined surface 542.

In the traditional method of generating white light by using red, green and blue light emitting diodes, the coverage of the light emitting diodes of each color varies according to the degree, so this color unevenness easily occurs. On the contrary, the light mixing device of the present invention can make the illumination angles of different light sources produce the same coverage angle. At the same time, the present invention further sets the limit of the light source distance P to be less than 5% of the diameter D of the lens 24 in order to increase = ,,, = Uniformity 'Therefore, the light mixing effect can be greatly improved to provide high-quality, Γ light. If red, green and blue three-color light-emitting diodes are applied to the light mixing device of the present invention, they can be used to emit light to white of high quality. The above is a detailed description of the present invention using preferred embodiments, but is not limited thereto.

1245434

Page 12 1245434 Brief description of the diagram Brief description of the diagram: The first diagram is a schematic cross-sectional view of a conventional light emitting diode package structure. The second diagram is a schematic diagram of the package structure of the first diagram, which is applied to the case where light emitting diodes of different colors are mixed. Figure A is a schematic cross-sectional view of the first embodiment of the light mixing device of the present invention. _ Third B is a schematic top view of the first embodiment of the light mixing device of the present invention. The third C picture is an enlarged view of the inclined plane of the third A picture, and shows the optical effects of light from different light sources on the inclined plane. The fourth diagram is a schematic diagram of the application of the light mixing device of the present invention to red, green, and blue three-color light emitting diodes + a preferred embodiment. FIG. 5A is a schematic cross-sectional view of a second embodiment of a light mixing device according to the present invention. Fifth B is a schematic plan view of a second embodiment of the light mixing device of the present invention. ‘FIG. 6A is a schematic cross-sectional view of a third embodiment of a light mixing device according to the present invention. _ Figure 6B is a schematic top view of the third embodiment of the light mixing device of the present invention. FIG. 7A is a schematic cross-sectional view of a fourth embodiment of the light mixing device according to the present invention. FIG. 7B is a schematic plan view of a fourth embodiment of the light mixing device according to the present invention. \

Drawing number description: U light emitting diode 1 2 lens structure 1 6 lens 24, 34, 44, 54 " light transmitting layer 26

Page 13 1245434 Brief description of the drawing Carrier board 22 Reflective coating 2 2 2 Bevel 24 2, 342, 442, 542 iiiii Page 14 ❸

Claims (1)

1245434 6. Scope of patent application 1 5. The white light mixing device according to item 14 of the scope of patent application, wherein the number of the inclined surfaces is 5 to 15. 16. The white light mixing device according to item 12 of the scope of patent application, wherein the white light mixing device has three light emitting diodes of red, green and blue, which are arranged in a regular triangle on the carrier board, and the lens The central axis system passes through the regular triangle. 1 7. The white light mixing device according to item 12 of the patent application scope, wherein the distance between the adjacent light emitting diodes is less than 5% of the lens diameter. 1 8. The white light mixing device according to item 12 of the scope of patent application, wherein the upper surface of the carrier board has a reflective key layer to reflect upward part of the light that is totally reflected by the inclined surface. 19. The white-light mixing device according to item 12 of the patent application scope, wherein the light-transmitting layer is made of epoxy (Ag) or silver (Ag) semi-transmissive-diffusion adhesive. Page 17