TW202248738A - Illumination system - Google Patents

Abstract

A illumination system includes a light source module and a light combining module. The light source module is adapted to provide a first color light beam, a second color light beam and a third color light beam, respectively. The light combining module has a first optical surface, a second optical surface and a third optical surface parallel to each other. The first optical surface faces the light source module and is located between the light source module and the second optical surface, and the second optical surface is located between the first optical surface and the third optical surface.

Description

Lighting system

The present invention relates to a lighting system, and in particular to a lighting system with a light-combining module.

Recently, projection devices based on solid-state light sources such as light-emitting diodes (light-emitting diodes, LEDs) and laser diodes (laser diodes) have gradually gained a place in the market. Since the laser diode has a luminous efficiency higher than about 20%, in order to break through the light source limitation of the light emitting diode, projection devices using the laser diode as the required pure color light source have been gradually developed.

However, under the light path structure of the existing projection device using a laser light source, it is necessary to set up different light-combining elements. The structure occupies a large volume and the cost is high, and a projection device that uses a single three-primary-color laser diode as the required pure-color light source will have the problem of low optical efficiency or poor color uniformity.

The "Prior Art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "Prior Art" paragraph may contain some conventional technologies that do not constitute the knowledge of those with ordinary skill in the art. The content disclosed in the "Prior Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The invention provides an illumination system with the advantages of good optical efficiency and color uniformity and small volume.

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a lighting system. The lighting system includes a light source module and a light combination module. The light source module is a single laser diode of three primary colors, which is suitable for providing a first color light beam, a second color light beam and a third color light beam respectively. The light combination module has a first optical surface, a second optical surface and a third optical surface parallel to each other, wherein the first optical surface is located on the transmission path of the first color light beam, the second color light beam and the third color light beam , the second optical surface is located on the transmission path of the second color light beam and the third color light beam, and the third optical surface is located on the transmission path of the third color light beam. The first optical surface faces the light source module and is located between the light source module and the second optical surface, and the second optical surface is located between the first optical surface and the third optical surface.

In an embodiment of the present invention, the above-mentioned light combination module includes a first color separation element and a second color separation element. Two opposite surfaces of the first dichroic element are respectively a first optical surface and a second optical surface, and the first optical surface faces the light source module. One of the surfaces of the second dichroic element is the third optical surface. In an embodiment of the present invention, the above light combination module includes a first color separation element, a second color separation element and a third color separation element. The first dichroic element is located on the transmission path of the first color light beam, wherein the surface of the first dichroic element facing the light source module is the first optical surface. The second dichroic element is located on the transmission path of the second color light beam, wherein the surface of the second dichroic element facing the first dichroic element is the second optical surface. The third dichroic element is located on the transmission path of the third color light beam, wherein the surface of the third dichroic element facing the second dichroic element is a third optical surface. In an embodiment of the present invention, the above-mentioned first color light beam, second color light beam and third color light beam enter the light combination module through the first optical surface, the first color light beam is reflected by the first optical surface, and the second color light beam After passing through the first optical surface, the colored light beam is reflected by the second optical surface and passes through the first optical surface again, and the third colored light beam sequentially passes through the first optical surface and the second optical surface, and is reflected by the third optical surface And pass through the second optical surface and the first optical surface again in sequence, after that, the first color light beam, the second color light beam and the third color light beam merge into an illumination light beam. In an embodiment of the present invention, the above-mentioned light-combining module includes a first coating, a second coating and a third coating. The first coating is located on the first optical surface, wherein the first coating is suitable for reflecting the first color light beam and allowing the second color light beam and the third color light beam to pass through. The second coating is located on the second optical surface, wherein the second coating is suitable for reflecting the second color light beam and allowing the third color light beam to pass through. The third coating is located on the third optical surface, wherein the third coating is suitable for reflecting the third color light beam. In an embodiment of the present invention, the above-mentioned light source module includes a first light source, a second light source and a third light source, the first light source is suitable for providing a first color light beam, and the second light source is suitable for providing a second color light beam. The light beam, and the third light source is suitable for providing the third color light beam, and the first light source, the second light source and the third light source are laser diode components packaged in the light source module.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a lighting system. The lighting system includes a first color laser light source, a second color laser light source, a third color laser light source, a first color separation film, a second color separation film and a third color separation film. The first dichroic film is located downstream of the first optical path of the first color laser light source. The second dichroic film is located downstream of the second optical path of the second color laser light source. The third dichroic film is located downstream of the third optical path of the third color laser light source. The first dichroic film, the second dichroic film and the third dichroic film are parallel to each other, part of the first optical path, part of the second optical path and part of the third optical path are parallel to each other, and the second dichroic film is arranged on the first dichroic film and between the light path of the first color laser light source. In an embodiment of the present invention, the above-mentioned first color laser light source is suitable for providing a first color light beam, the second color laser light source is suitable for providing a second color light beam, and the third color laser light source is suitable for A third color light beam is provided, and the first color laser light source, the second color laser light source and the third color laser light source are laser diode elements packaged in a single three primary color laser diode.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a lighting system. The lighting system includes a first color collimated light source, a second color collimated light source, a third color collimated light source, a first dichroic film, a second dichroic film and a reflective film. The first color collimated light source provides a first color light beam. The second color collimated light source provides a second color light beam. The third color collimated light source provides a third color light beam. The first dichroic film is arranged on the transmission path of the first color light beam, the second color light beam and the third color light beam. The second dichroic film is arranged on the transmission path of the first color light beam and the second color light beam; the reflection film is arranged on the transmission path of the first color light beam. The light beam of the first color will pass through the first dichroic film and the second dichroic film in sequence, be reflected by the reflective film, and then pass through the second dichroic film and the first dichroic film in sequence, and the light beam of the second color will be sequentially Penetrating through the first dichroic film, being reflected by the second dichroic film and penetrating the first dichroic film, the light beam of the third color will be reflected by the first dichroic film, and the first dichroic film and the second dichroic film and The reflective films are parallel to each other.

Based on the above, the embodiments of the present invention have at least one of the following advantages or functions. In the embodiment of the present invention, the lighting system can achieve the function of combining light through the arrangement of the first optical surface, the second optical surface and a third optical surface of the light combining module without using other combining elements. The light structure can simplify the manufacturing process and reduce the manufacturing cost, and is beneficial to mass production. Moreover, in the embodiment of the present invention, since the light source module can be a single three-primary-color laser diode, the distance between the first dichroic element and the second dichroic element of the light-combining module can be correspondingly reduced , so it is beneficial to reduce the volume of the light-combining module, thereby effectively reducing the volume of the lighting system. In addition, in the embodiment of the present invention, the lighting system can properly design the distance between each light beam and each optical surface based on the refractive index of each component of the light combining module, so that the first color light beam, the second color light beam And the third color light beam can emit light from the same position of the first optical surface of the light combination module, so that the combined illumination light beam can have good optical efficiency and color uniformity.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

FIG. 1 is a schematic diagram of an optical architecture of an illumination system according to an embodiment of the present invention. Please refer to FIG. 1 , in this embodiment, the lighting system 100 includes a light source module 110 and a light combining module 120 , and is suitable for being applied to a projection device. The light source module 110 is adapted to provide a first color light beam L1 , a second color light beam L2 and a third color light beam L3 respectively. Specifically, as shown in FIG. 1, in this embodiment, the light source module 110 includes a first light source 111, a second light source 112, and a third light source 113. The first light source 111 is suitable for providing a first color light beam L1, the second light source 112 is suitable for providing the second color light beam L2, and the third light source 113 is suitable for providing the third color light beam L3. For example, in this embodiment, the first light source 111 can be a blue laser diode, and the first color beam L1 is a blue laser beam; the second light source 112 can be a green laser diode, and The second color beam L2 is a green laser beam; the third light source 113 can be a red laser diode, and the third color beam L3 is a red laser beam. In addition, in this embodiment, the light source module 110 can be a three-primary-color laser diode, and the first light source 111, the second light source 112, and the third light source 113 are laser diode components packaged therein, but The present invention is not limited thereto.

On the other hand, as shown in FIG. 1 , in this embodiment, the light combination module 120 has a first optical surface S1 , a second optical surface S2 and a third optical surface S3 parallel to each other. The first optical surface S1 faces the light source module 110 and is located between the light source module 110 and the second optical surface S2 , and the second optical surface S2 is located between the first optical surface S1 and the third optical surface S3 .

Specifically, in this embodiment, the light combining module 120 includes a first dichroic element 121 and a second dichroic element 122 . The first dichroic element 121 is located on the transmission paths of the first color light beam L1, the second color light beam L2 and the third color light beam L3, wherein the two opposite surfaces of the first color separation element 121 are the first optical surface S1 and the first optical surface S1 respectively. The second optical surface S2 and the first optical surface S1 face the light source module 110 . The second dichroic element 122 is located on the transmission path of the third color light beam L3, wherein the surface of the second dichroic element 122 facing the first dichroic element 121 is the third optical surface S3.

Specifically, in this embodiment, the first optical surface S1, the second optical surface S2, and the third optical surface S3 of the light combining module 120 can be coated with different dichroic films or reflective films, so as to reflect the first The color light beam L1 , the second color light beam L2 and the third color light beam L3 respectively provide reflection or transmission. For example, as shown in FIG. 1 , in this embodiment, the light combination module 120 includes a first coating F1 , a second coating F2 and a third coating F3 . As shown in Figure 1, the first coating F1 is located on the first optical surface S1, and the first coating F1 can be a blue light reflective film (DMB), which can reflect blue light and allow red and green light to pass through, and is suitable for reflection The first color light beam L1 passes through the second color light beam L2 and the third color light beam L3. Moreover, as shown in Figure 1, the second coating F2 is located on the second optical surface S2, and the second coating F2 can be a green light reflective film (DMG), which can reflect green light and allow red light to pass through, and is suitable for The second color light beam L2 is reflected, and the third color light beam L3 is transmitted. In addition, as shown in FIG. 1 , the third coating F3 is located on the third optical surface S3 , and the third coating F3 can be a red reflective film (DMR) or a general reflective film, which is suitable for reflecting the third color light beam L3 .

In this way, as shown in FIG. 1 , when the first color light beam L1, the second color light beam L2 and the third color light beam L3 enter the light combining module 120 through the first optical surface S1, the first color light beam L1 will be absorbed by the first optical surface S1. Surface S1 reflection. Moreover, the second color light beam L2 will pass through the first optical surface S1, be reflected by the second optical surface S2, and pass through the first optical surface S1 again. In addition, the third color light beam L3 passes through the first optical surface S1 and the second optical surface S2 in sequence, is reflected by the third optical surface S3 and passes through the second optical surface S2 and the first optical surface S1 again in sequence. Afterwards, the first color light beam L1 , the second color light beam L2 and the third color light beam L3 can be combined into an illumination light beam L.

Further, as shown in FIG. 1 , since the first optical surface S1 of the first color light beam L1, the second color light beam L2 and the third color light beam L3 incident on the light combining module 120 are parallel to each other, and the light combining module 120 The first optical surface S1, the second optical surface S2, and the third optical surface S3 are also parallel to each other, so as long as the first color light beam L1, The distance between the second color light beam L2 and the third color light beam L3 and the distance between the first optical surface S1, the second optical surface S2 and the third optical surface S3, the first color light beam L1, the second color light beam L2 and The third color light beam L3 can be emitted from the same position of the first optical surface S1 of the light combining module 120 , so that the combined illumination light beam L can have good optical efficiency and color uniformity.

That is to say, as shown in FIG. 1, the distance P1 between the first color light beam L1 and the second color light beam L2, the distance P2 between the second color light beam L2 and the third color light beam L3, the distance between the first optical surface S1 and the third color light beam L3 The range of the distance between the second optical surface S2 (that is, the width dimension W1 of the first dichroic element 121 shown in FIG. 1 ) and the range of the distance between the second optical surface S2 and the third optical surface S3 (that is, the range of The minimum distance D1 between the first dichroic element 121 and the second dichroic element 122 shown in 1) can be calculated and designed according to the refractive index of the first dichroic element 121 and the second dichroic element 122, and can be The first color light beam L1, the second color light beam L2, and the third color light beam L3 are emitted from the same position of the first optical surface S1 of the light combination module 120, so that the combined illumination light beam L has good optical efficiency and color uniformity.

In this way, the lighting system 100 can achieve the function of combining light through the configuration of the first optical surface S1, the second optical surface S2 and a third optical surface S3 of the light combining module 120 without using other The light-combining structure can simplify the manufacturing process and reduce the manufacturing cost, which is beneficial to mass production. Moreover, since the light source module 110 can be a single three-primary-color laser diode, the distance between the first dichroic element 121 and the second dichroic element 122 of the light combining module 120 can be correspondingly reduced, so it can be advantageous In order to reduce the volume of the light-combining module 120 , the volume of the lighting system 100 can be effectively reduced.

Fig. 2 is a schematic diagram of an optical architecture of an illumination system according to an embodiment of the present invention. Please refer to FIG. 2 , the lighting system 200 of FIG. 2 is similar to the lighting system 100 of FIG. 1 , and the differences are as follows. Specifically, as shown in FIG. 2 , in this embodiment, the light combination module 220 further includes a third dichroic element 223 . Moreover, as shown in FIG. 2, in this embodiment, the first dichroic element 221 is located on the transmission path of the first color beam L1, the second color beam L2, and the third color beam L3, wherein the first dichroic element 221 The surface facing the light source module 110 is the first optical surface S1. The second dichroic element 222 is located on the transmission path of the second color light beam L2 and the third color light beam L3, wherein the surface of the second dichroic element 222 facing the first dichroic element 221 is the second optical surface S2. The third dichroic element 223 is located on the transmission path of the third color light beam L3, wherein the surface of the third dichroic element 223 facing the second dichroic element 222 is the third optical surface S3.

In this way, as shown in FIG. 2, when the first color light beam L1, the second color light beam L2, and the third color light beam L3 enter the light combining module 220 through the first optical surface S1 of the first dichroic element 221, the first color light beam The light beam L1 will be reflected by the first optical surface S1. Moreover, the second color light beam L2 will pass through the first optical surface S1 of the first dichroic element 221 and then be reflected by the second optical surface S2 of the second dichroic element 222 and then pass through the first optical surface S1 of the first dichroic element 221 again. Optical surface S1. In addition, the third color light beam L3 will sequentially pass through the first optical surface S1 of the first dichroic element 221 and the second optical surface S2 of the second dichroic element 222, and then be transmitted by the third optical surface of the third dichroic element 223. The surface S3 reflects and passes through the second optical surface S2 of the second dichroic element 222 and the first optical surface S1 of the first dichroic element 221 again in sequence. Afterwards, the first color light beam L1 , the second color light beam L2 and the third color light beam L3 can be combined into an illumination light beam L .

Similarly, in this embodiment, the lighting system 200 can also properly design the first color light beam L1, the second color light beam L1, and the second The distance between the color light beam L2 and the third color light beam L3 and the distance between the first optical surface S1, the second optical surface S2 and the third optical surface S3, the first color light beam L1, the second color light beam L2 and the third color light beam The colored light beams L3 can be emitted from the same position of the first optical surface S1 of the light combining module 220 , so that the combined illuminating light beams L can have good optical efficiency and color uniformity.

Further, as shown in FIG. 2, the distance P1 between the first color light beam L1 and the second color light beam L2, the distance P2 between the second color light beam L2 and the third color light beam L3, the distance between the first optical surface S1 and the The range of the distance between the second optical surfaces S2 will be determined by the width dimension W1 of the first dichroic element 221 and the minimum distance D1 between the first dichroic element 221 and the second dichroic element 222. The distance between the surface S2 and the third optical surface S3 is determined by the width W2 of the second dichroic element 222 and the minimum distance D2 between the second dichroic element 222 and the third dichroic element 223, The above parameters can be calculated and designed according to the refractive index of the first dichroic element 221, the second dichroic element 222 and the third dichroic element 223, so that the first color light beam L1, the second color light beam L2 and The third color light beam L3 emerges from the same position of the first optical surface S1 of the light combination module 120 , so that the combined illumination light beam L has good optical efficiency and color uniformity.

In this way, since the lighting system 200 in FIG. 2 has a similar structure to the lighting system 100 in FIG. The optical surface S3 is configured to achieve the same function, so the lighting system 200 can achieve effects and advantages similar to those of the aforementioned lighting system 100 , which will not be repeated here.

In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiment of the present invention, the lighting system can achieve the function of combining light through the arrangement of the first optical surface, the second optical surface and a third optical surface of the light combining module without using other combining elements. The light structure can simplify the manufacturing process and reduce the manufacturing cost, and is beneficial to mass production. Moreover, in the embodiment of the present invention, since the light source module can be a single three-primary-color laser diode, the distance between the first dichroic element and the second dichroic element of the light-combining module can be correspondingly reduced , so it is beneficial to reduce the volume of the light-combining module, thereby effectively reducing the volume of the lighting system. In addition, in the embodiment of the present invention, the lighting system can properly design the distance between each light beam and each optical surface based on the refractive index of each component of the light combining module, so that the first color light beam, the second color light beam And the third color light beam can emit light from the same position of the first optical surface of the light combination module, so that the combined illumination light beam can have good optical efficiency and color uniformity.

But what is described above is only a preferred embodiment of the present invention, and should not limit the scope of implementation of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention, All still belong to the scope covered by the patent of the present invention. In addition, any embodiment or scope of claims of the present invention does not need to achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract and the title are only used to assist the search of patent documents, and are not used to limit the scope of rights of the present invention. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name elements (elements) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. upper or lower limit.

100, 200: lighting system 110:Light source module 111: The first light source 112: Second light source 113: The third light source 120, 220: combined light module 121: The first color separation component 122: Second color separation element 223: The third color separation component D1, D2: minimum distance F1: first coating F2: Second coating F3: The third coating L: lighting beam L1: first color beam L2: Second color beam L3: Tertiary color beam P1, P2: Pitch SS1: first side surface SS2: Second side surface S1: the first optical surface S2: second optical surface S3: The third optical surface W1, W2: Width size

FIG. 1 is a schematic diagram of an optical architecture of an illumination system according to an embodiment of the present invention. Fig. 2 is a schematic diagram of an optical architecture of an illumination system according to an embodiment of the present invention.

100: Lighting system

110:Light source module

111: The first light source

112: Second light source

113: The third light source

120: Combined light module

121: The first color separation component

122: Second color separation element

D1: minimum distance

F1: first coating

F2: Second coating

F3: The third coating

L: lighting beam

L1: first color beam

L2: Second color beam

L3: Tertiary color beam

P1, P2: Pitch

S1: the first optical surface

S2: second optical surface

S3: The third optical surface

W1: Width size

Claims (10)

A lighting system comprising: A light source module, the light source module is a single three-primary-color laser diode, suitable for providing a first-color beam, a second-color beam, and a third-color beam respectively; and A light combining module has a first optical surface, a second optical surface and a third optical surface parallel to each other, wherein the first optical surface is located between the first color light beam, the second color light beam and the third color light beam On the transmission path of the color light beam, the second optical surface is located on the transmission path of the second color light beam and the third color light beam, and the third optical surface is located on the transmission path of the third color light beam, wherein the first The optical surface faces the light source module and is located between the light source module and the second optical surface, and the second optical surface is located between the first optical surface and the third optical surface. The lighting system as claimed in item 1, wherein the light-combining module includes: A first dichroic element, wherein the two opposite surfaces of the first dichroic element are the first optical surface and the second optical surface respectively, and the first optical surface faces the light source module; and A second dichroic element, wherein one surface of the second dichroic element is the third optical surface. The lighting system according to claim 2, wherein the first color light beam, the second color light beam and the third color light beam enter the light combination module through the first optical surface, and the first color light beam is captured by the first color light beam. The light beam of the second color passes through the first optical surface and is reflected by the second optical surface and passes through the first optical surface again, and the third color light beam sequentially passes through the first optical surface and the first optical surface After the second optical surface, it is reflected by the third optical surface and passes through the second optical surface and the first optical surface in sequence, and then, the first color light beam, the second color light beam and the third color light beam combined into one illuminating beam. The lighting system as claimed in item 1, wherein the light-combining module includes: A first dichroic element, located on the transmission path of the first color light beam, wherein the surface of the first dichroic element facing the light source module is the first optical surface; a second dichroic element, located on the transmission path of the second color light beam, wherein the surface of the second dichroic element facing the first dichroic element is the second optical surface; and A third dichroic element is located on the transmission path of the third color light beam, wherein the surface of the third dichroic element facing the second dichroic element is the third optical surface. The lighting system according to claim 4, wherein the first color light beam, the second color light beam and the third color light beam enter the light combination module through the first optical surface, and the first color light beam is captured by the first color light beam. The light beam of the second color passes through the first optical surface and is reflected by the second optical surface and passes through the first optical surface again, and the third color light beam sequentially passes through the first optical surface and the first optical surface After the second optical surface, it is reflected by the third optical surface and passes through the second optical surface and the first optical surface in sequence, and then, the first color light beam, the second color light beam and the third color light beam combined into one illuminating beam. The lighting system according to any one of claims 1 to 5, wherein the light combination module includes: A first coating located on the first optical surface, wherein the first coating is suitable for reflecting the first color light beam and allowing the second color light beam and the third color light beam to pass through; a second coating located on the second optical surface, wherein the second coating is suitable for reflecting the second color light beam and allowing the third color light beam to pass through; and A third coating film is located on the third optical surface, wherein the third coating film is suitable for reflecting the third color light beam. The lighting system according to claim 1, wherein the light source module includes a first light source, a second light source and a third light source, the first light source is suitable for providing the first color light beam, and the second light source is suitable for The second color light beam is provided, and the third light source is suitable for providing the third color light beam, and the first light source, the second light source and the third light source are laser diode elements packaged in the light source module . A lighting system comprising: a first-color laser light source; a second color laser light source; a third-color laser light source; A first dichroic film, located downstream of the first optical path of the first color laser light source; A second dichroic film, located downstream of the second light path of the second color laser light source; and A third dichroic film, located downstream of the third optical path of the third color laser light source, wherein the first dichroic film, the second dichroic film, and the third dichroic film are parallel to each other, part of the first optical path , part of the second light path and part of the third light path are parallel to each other, and the second dichroic film is arranged between the first color dichroic film and the light path of the first color laser light source. The lighting system as described in Claim 1, wherein the first color laser light source is adapted to provide a first color beam, the second color laser light source is adapted to provide a second color light beam, and the third color laser The light source is suitable for providing a third color light beam, and the first color laser light source, the second color laser light source and the third color laser light source are lasers packaged in a single three primary color laser diode diode element. A lighting system comprising: A first color collimated light source, providing a first color light beam; A collimated light source of a second color, providing a light beam of a second color; A collimated light source of a third color, providing a light beam of a third color; A first dichroic film, arranged on the transmission path of the first color light beam, the second color light beam and the third color light beam; a second dichroic film arranged on the transmission path of the first color light beam and the second color light beam; and A reflective film, arranged on the transmission path of the first color light beam, wherein the first color light beam will sequentially pass through the first dichroic film and the second dichroic film, be reflected by the reflective film, and then sequentially penetrating the second dichroic film and the first dichroic film, the light beam of the second color will sequentially pass through the first dichroic film, be reflected by the second dichroic film and pass through the first dichroic film, The light beam of the third color is reflected by the first dichroic film, and the first dichroic film, the second dichroic film and the reflective film are parallel to each other.

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