A laser light source system with right-angle reflector and bidirectional excitation color wheel

Abstract

The invention discloses a laser light source system with a right-angle reflector and a bidirectional excitation color wheel, comprising a light source excitation unit for generating blue laser, a reflector group, a color mirror group, a red filter, a relay lens group and a bidirectional excitation color wheel; the reflector group comprises a first right-angle reflector, a second reflector and a third trapezoidal reflector for reflecting all color lights; the color mirror group comprises a first color mirror for reflecting blue light and transmitting green light, a second color mirror for reflecting red light or yellow light and transmitting blue light, and a third color mirror for reflecting blue light or green light and transmitting red light; the relay lens group comprises a first relay lens and a second relay lens; a first relay lens located between the first color mirror and the bidirectional excitation color wheel, and a second relay lens located between the first right-angle reflector and the bidirectional excitation color wheel. Compared with the prior art, the invention adopts such a bidirectional excitation color wheel to achieve the three-primary color effect that can only be output by a light source with dual color wheels and dual drive, thereby simplifying the structure.

Description

Technical Field

[0001] The invention relates to the field of projection technology, in particular to a laser light source system with a right-angle reflector and a bidirectional excitation color wheel. Background Art

[0002] With the rapid development of the large-screen display market, LCD display technology has encountered huge technical difficulties and high cost problems, making the laser projection market more and more intense. Among the light sources composed of lasers and fluorescent light generated by stimulated phosphors currently used in the industry, blue lasers are usually used as laser light sources and excitation light sources for laser projection systems. This technical solution has matured and is widely used in home, education, business and other occasions.

[0003] In the prior art, blue light is mostly used to excite yellow light and green light, and then red light is generated through a red filter. That is, when a blue laser hits a fluorescent color wheel, it will excite green phosphor and yellow phosphor to generate green light and yellow light respectively, and then filter the yellow light to obtain red light. The green light and yellow light generated by blue light excitation are located in the same optical path. However, since the spectra of yellow light and green light overlap, the energy of green light will be reduced when passing through the red filter. In order to obtain efficient red light, most of them use a dual-color wheel structure, and the blue laser is realized through a fluorescent wheel and a color filter wheel. The key is to ensure the synchronization of the fluorescent wheel and the color filter wheel. In a time sequence, only one color is output after passing through the color filter wheel. For example, when the fluorescent wheel outputs yellow, the color filter wheel also rotates to the yellow light filter area. Otherwise, it may cause the superposition of different colors, the color changes, and the normal time sequence output of the three primary colors cannot be formed.

[0004] The existing dual-color wheel structure light source system, that is, two driving devices drive the fluorescent wheel and the filter wheel respectively, has a complex structure, high cost, and needs to ensure the complete synchronization of the two wheels. However, the use of a single-color wheel light source system cannot achieve high-efficiency three-primary color output, for which we designed this solution. Summary of the invention

[0005] To solve the above technical solution, the purpose of the present invention is to provide a laser light source system with a right-angle reflector and a bidirectional excitation color wheel, which can separate the yellow light and the green light and then filter out the red light to obtain a high-efficiency three-primary color light source.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a laser light source system with a right-angle reflector and a bidirectional excitation color wheel, characterized in that it includes a light source excitation unit for generating blue laser, a reflector group, a color mirror group, a red filter, a relay lens group and a bidirectional excitation color wheel;

[0007] The reflector group comprises a first right-angle reflector, a second reflector and a third trapezoidal reflector for reflecting all color lights.

[0008] The color mirror group includes a first color mirror for reflecting blue light and transmitting green light, a second color mirror for reflecting red light or yellow light and transmitting blue light, and a third color mirror for reflecting blue light or green light and transmitting red light;

[0009] The relay lens group includes a first relay lens and a second relay lens; the first relay lens is located between the first color mirror and the bidirectional excitation color wheel, and the second relay lens is located between the first right-angle reflector and the bidirectional excitation color wheel;

[0010] The second color mirror, the second reflector, the third color mirror and the third trapezoidal reflector form a rectangle and are respectively located at the four vertices of the rectangle. The first right-angle reflector is arranged on the left side of the second color mirror, and the first color mirror is arranged between the first right-angle reflector and the third trapezoidal reflector; the first color mirror, the third color mirror and the third trapezoidal reflector are arranged close to the first working surface of the bidirectional excitation color wheel, and the first right-angle reflector, the second color mirror and the second reflector are arranged close to the second working surface of the bidirectional excitation color wheel.

[0011] Furthermore, the working radius of the second working ring is equal to that of the first working ring, the radii of the first working ring and the second working ring are both smaller than the third working ring, and the first working ring, the second working ring and the third working ring are all concentric with the rotation axis of the bidirectional excitation color wheel.

[0012] The angle of the second light-transmitting area of ​​the second working ring is equal to the sum of the angles of the second fluorescent area and the third light-transmitting area of ​​the third working ring.

[0013] The angle extension line between the second fluorescent area and the third light-transmitting area passing through the center of the circle is consistent with the angle extension line passing through the center of the circle of the second light-transmitting area.

[0014] The second fluorescent area of ​​the third working ring is coated with red fluorescent powder or yellow fluorescent powder to form a red fluorescent area or a yellow fluorescent area.

[0015] When the second fluorescent area is coated with yellow fluorescent powder, a red filter is arranged between the second reflecting mirror and the third color mirror.

[0016] The first fluorescent area of ​​the first working ring is coated with green fluorescent powder.

[0017] The first fluorescent area and the first light-transmitting area are arranged to be one or more and are distributed crosswise, that is, they include a plurality of first fluorescent areas and first light-transmitting areas.

[0018] The second fluorescent area and the third light-transmitting area are set to be one or more cross-distributed, wherein the distribution of one or more of the second fluorescent areas corresponds to the distribution of the first light-transmitting areas, and the sum of the angles of the multiple second fluorescent areas distributed at intervals and the multiple third light-transmitting areas distributed at intervals is equal to the sum of the angles of the multiple first light-transmitting areas distributed at intervals.

[0019] When the present invention is working, the light source excitation unit emits blue light, which is reflected by the first color mirror to the first working ring of the first working surface of the bidirectional laser color wheel. When the blue light contacts the first fluorescent area of ​​the first working ring, green light is generated and reflected. The reflected green light transmits the first color mirror, and is reflected by the third trapezoidal reflector to the third color mirror. The third color mirror reflects the green light out of the light source system. When the blue light contacts the first light-transmitting area of ​​the first working ring of the bidirectional excitation color wheel, the transmitted blue light passes through the first right-angle reflector and the second color mirror to reach the third working ring of the second working surface. When the blue light contacts the second fluorescent area (red fluorescent powder at this time) of the third working ring, red light is generated and reflected. The reflected red light is reflected by the second color mirror and the second reflector, and is transmitted out of the light source system by the third color mirror. When the blue light contacts the third light-transmitting area of ​​the third working ring, the transmitted blue light is reflected by the third trapezoidal reflector to the third color mirror. The third color mirror reflects the blue light out of the light source system, thereby realizing that the entire light source system sequentially outputs the three primary colors of green light, red light and blue light.

[0020] In the above working principle, red light can also be generated in this way: when blue light contacts the first light-transmitting area of ​​the first working ring of the bidirectional excitation color wheel, the transmitted blue light passes through the first right-angle reflector and the second color mirror to reach the third working ring of the second working surface. When the blue light contacts the second fluorescent area of ​​the third working ring (yellow fluorescent powder at this time), yellow light is generated and reflected. The reflected yellow light is reflected by the second color mirror and the second reflector to reach the red filter. After filtering out the red light, the red light is transmitted out of the light source system through the third color mirror.

[0021] The beneficial effects of the present invention are as follows: by adopting the method of bidirectionally exciting the color wheel, the yellow light and the green light generated by the blue laser exciting the yellow phosphor and the green phosphor are respectively located in different light paths, and the traditional color filter wheel is eliminated. A red filter is added to the light path of the yellow light to filter the red light from the yellow light, which does not cause the attenuation of the green light, and there is no problem of synchronization between the fluorescent wheel and the color filter wheel. The three-primary color effect that can only be output by a light source with dual color wheel dual drive is achieved, thereby simplifying the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the working principle of the present invention.

[0023] Figure 2 yes Figure 1 Another embodiment of .

[0024] Figure 3 It is a structural schematic diagram of the first working surface and the second working surface of the bidirectional excitation color wheel in the present invention.

[0025] Figure 4 yes Figure 3 Another embodiment of .

[0026] Figure 5 yes Figure 3 The third embodiment of the present invention.

[0027] Attached Figure 1-5 In the figure, 10. bidirectional excitation color wheel, 11. first fluorescent area, 12. first light-transmitting area, 13. second fluorescent area, 14. third light-transmitting area, 16. first working ring, 17. second working ring, 18. third working ring, 20. light source excitation unit, 21. second light-transmitting area, 31. first color mirror, 32. second color mirror, 33. third color mirror, 41. first right-angle reflector, 42. second reflector, 43. third trapezoidal reflector, 51. first relay lens, 52. second relay lens, 60. red filter, 61. light source output unit. DETAILED DESCRIPTION Example

[0028] Attached Figure 1 and Figure 3 As a first embodiment of the present invention, a laser light source system with a right-angle reflector and a bidirectional excitation color wheel is disclosed, comprising a light source excitation unit 20 for generating blue laser, a reflector group, a color mirror group, a red filter 60, a relay lens group and a bidirectional excitation color wheel;

[0029] The reflector group includes a first right-angle reflector 41 , a second reflector 42 and a third trapezoidal reflector 43 for reflecting all color lights.

[0030] The color mirror group includes a first color mirror 31 for reflecting blue light and transmitting green light, a second color mirror 32 for reflecting red light or yellow light and transmitting blue light, and a third color mirror 33 for reflecting blue light or green light and transmitting red light;

[0031] The relay lens group includes a first relay lens 51 and a second relay lens 52; the first relay lens 51 is located between the first color mirror 31 and the bidirectional excitation color wheel 10, and the second relay lens 52 is located between the first right-angle reflector 41 and the bidirectional excitation color wheel 10;

[0032] The second color mirror 32, the second reflector 42, the third color mirror 33 and the third trapezoidal reflector 43 form a rectangle and are respectively located at the four vertices of the rectangle. The first right-angle reflector 41 is arranged on the left side of the second color mirror 32, and the first color mirror 31 is arranged between the first right-angle reflector 41 and the third trapezoidal reflector 43; the first color mirror 31, the third color mirror 33 and the third trapezoidal reflector 43 are arranged close to the first working surface of the bidirectional excitation color wheel 10, and the first right-angle reflector 41, the second color mirror 32 and the second reflector 42 are arranged close to the second working surface of the bidirectional excitation color wheel 10.

[0033] Furthermore, the working radius of the second working ring is equal to that of the first working ring, the radii of the first working ring and the second working ring are both smaller than the third working ring, and the first working ring, the second working ring and the third working ring are all concentric with the rotating shaft of the bidirectional excitation color wheel 10, and the rotating shaft is driven by a motor.

[0034] The angle of the second light-transmitting area 21 of the second working ring is equal to the sum of the angles of the second fluorescent area 13 and the third light-transmitting area 14 of the third working ring.

[0035] The angle extension line of the second fluorescent area 13 and the third light-transmitting area 14 passing through the center of the circle is consistent with the angle extension line of the second light-transmitting area 21 passing through the center of the circle.

[0036] The second fluorescent area 13 of the third working ring is coated with red fluorescent powder to form a red fluorescent area.

[0037] The first fluorescent area 11 of the first working ring is coated with green fluorescent powder.

[0038] When the present embodiment is working, the light source excitation unit 20 emits blue light, which is reflected by the first color mirror 31 to the first working ring of the first working surface of the bidirectional laser color wheel 10. When the blue light contacts the first fluorescent area 11 of the first working ring, green light is generated and reflected. The reflected green light transmits the first color mirror 31, and is reflected by the third trapezoidal reflector 43 to the third color mirror 33. The third color mirror 33 reflects the green light out of the light source system. When the blue light contacts the first light-transmitting area 12 of the first working ring of the bidirectional excitation color wheel 10, the transmitted blue light passes through the first right-angle reflector 41, and passes through the second color mirror 32. When the blue light reaches the third working ring of the second working surface, red light is generated and reflected when the blue light contacts the second fluorescent area 13 (red fluorescent powder at this time) of the third working ring. The reflected red light is reflected by the second color mirror 32 and the second reflector 42, and is transmitted out of the light source system through the third color mirror 33. When the blue light contacts the third light-transmitting area 14 of the third working ring, the transmitted blue light is reflected to the third color mirror 33 through the third trapezoidal reflector 43, and the third color mirror 36 reflects the blue light out of the light source system, thereby realizing that the entire light source system outputs the three primary colors of green light, red light and blue light in sequence. Example

[0039] Attached Figure 2 and Figure 3 As a second embodiment of the present invention, a laser light source system with a right-angle reflector and a bidirectional excitation color wheel is disclosed, including a light source excitation unit 20 for generating blue laser, a reflector group, a color mirror group, a relay lens group and a bidirectional excitation color wheel;

[0040] The structure is different from that of embodiment 1 in that the second fluorescent area 13 of the third working ring is coated with yellow fluorescent powder to form a yellow fluorescent area. When the second fluorescent area 13 is coated with yellow fluorescent powder, a red filter 60 is arranged between the second reflector 42 and the third color mirror 33 to filter out red light.

[0041] The difference from the optical path of Example 1 lies in the way red light is generated: when blue light contacts the first light-transmitting area 12 of the first working ring of the bidirectional excitation color wheel 10, the transmitted blue light passes through the first right-angle reflector 41 and the second color mirror 32 to reach the third working ring of the second working surface. When the blue light contacts the second fluorescent area 13 (yellow fluorescent powder at this time) of the third working ring, yellow light is generated and reflected. The reflected yellow light is reflected by the second color mirror 32 and the second reflector 42 to reach the red filter 60. After filtering out the red light, the red light is transmitted out of the light source system through the third color mirror 33. Example

[0042] The first fluorescent area 11 and the first light-transmitting area 12 in the first working ring are set to one or more and are cross-distributed, that is, the first fluorescent area 11 includes fluorescent areas 111 and 112, and the first light-transmitting area 12 includes light-transmitting areas 121 and 122.

[0043] The second light-transmitting area 21 on the second working ring is also set to one or more, that is, the second light-transmitting area includes light-transmitting areas 211 and 212, which correspond to the light-transmitting areas 121 and 122 included in the first light-transmitting area 12 of the first working ring; the second fluorescent area 13 and the third light-transmitting area 14 on the third working ring are set to one or more cross-distributed, wherein the distribution of one or more of the second fluorescent area 13 and the third light-transmitting area 14 corresponds to the distribution of the second light-transmitting area 21, and the sum of the angles of the multiple second fluorescent areas 13 distributed at intervals and the multiple third light-transmitting areas 14 distributed at intervals is equal to the sum of the angles of the multiple second light-transmitting areas 21 distributed at intervals; the above-mentioned second fluorescent area includes fluorescent areas 131 and 132, and the third light-transmitting area includes light-transmitting areas 141 and 142.

[0044] The fluorescent areas 131 and 132 of the third working ring are coated with red or yellow fluorescent powder to form a red fluorescent area or a yellow fluorescent area.

[0045] The fluorescent areas 111 and 112 of the first working ring are coated with green fluorescent powder. Example

[0046] Attached Figure 5 As Figure 3 Another embodiment of Figure 5 The left side is the first working surface, and the right side is the second working surface; Figure 3 The structure of the bidirectional excitation color wheel shown differs in that:

[0047] The positions of the second working ring and the third working ring of the second working surface are interchanged, so that the second working ring is arranged outside the third working ring. Since the second working ring is a projection of the first working ring, the first working ring is arranged outside the first working surface.

[0048] The first light-transmitting area 12 and the second light-transmitting area 21 can be through holes or transparent glass coated with an anti-reflection film. The present invention can adjust the position of the light source excitation unit according to actual working conditions and realize light transmission by adding or reducing reflectors.

[0049] Although the prior art uses a method in which a blue laser excites green phosphor and yellow phosphor to produce green light and yellow light respectively, and then filters the yellow light to obtain red light. However, it is different from the traditional method. The traditional method is to coat yellow phosphor and green phosphor on a single side of the fluorescent wheel. The green light and yellow light produced by the blue light excitation are located in the same optical path. In order to obtain efficient red light, it is necessary to add a color filter wheel on the light output side of the fluorescent wheel, strictly keep the synchronization of the fluorescent wheel and the color filter wheel, and obtain the output of the three primary colors after filtering. The present device adopts a method of bidirectionally exciting the fluorescent wheel. The yellow light and green light produced by the blue laser excitation of the yellow phosphor and the green phosphor are located in different optical paths respectively, eliminating the traditional color filter wheel. A red filter is added to the optical path of the yellow light to obtain red light. At the same time, it will not cause the attenuation of the green light, and there is no problem of synchronization between the fluorescent wheel and the color filter wheel. High-efficiency three-primary color output is achieved.

[0050] The above-described embodiments are only a part of the embodiments of the present invention, and the concept and scope of the present invention are not limited to the details of the above-described exemplary embodiments. Therefore, without departing from the design concept of the present invention, various modifications and improvements made by other technicians in the field based on the technical solution of the present invention should fall within the protection scope of the present invention, and the contents of the present invention to be protected are all recorded in the claims.

Claims

1. A laser light source system having a right-angle reflector and a bidirectional excitation color wheel, characterized in that: It includes a light source excitation unit for generating blue laser, a reflector group, a color mirror group, a red filter, a relay lens group and a bidirectional excitation color wheel; The reflector group includes a first right-angle reflector, a second reflector and a third trapezoidal reflector for reflecting all color lights; The color mirror group includes a first color mirror for reflecting blue light and transmitting green light, a second color mirror for reflecting red light or yellow light and transmitting blue light, and a third color mirror for reflecting blue light or green light and transmitting red light; The relay lens group includes a first relay lens and a second relay lens; the first relay lens is located between the first color mirror and the bidirectional excitation color wheel, and the second relay lens is located between the first right-angle reflector and the bidirectional excitation color wheel; The bidirectional excitation color wheel comprises a first working surface and a second working surface arranged on the back of the first working surface, the first working surface has a first working ring, the first working ring comprises a first light-transmitting area and a first fluorescent area; the second working surface has a second working ring and a third working ring located outside the second working ring, the second working ring and the first working ring have a second light-transmitting area of ​​the same area, the third working ring comprises a second fluorescent area and a third light-transmitting area; the working radius of the second working ring is equal to that of the first working ring, the radii of the first working ring and the second working ring are both smaller than those of the third working ring, the first working ring, the second working ring and the third working ring are all concentric with the rotating axis of the bidirectional excitation color wheel; the angle of the second light-transmitting area of ​​the second working ring is equal to the sum of the angles of the second fluorescent area and the third light-transmitting area of ​​the third working ring; The second color mirror, the second reflector, the third color mirror and the third trapezoidal reflector form a rectangle and are respectively located at the four vertices of the rectangle. The first right-angle reflector is arranged on the left side of the second color mirror, and the first color mirror is arranged between the first right-angle reflector and the third trapezoidal reflector; the first color mirror, the third color mirror and the third trapezoidal reflector are arranged close to the first working surface of the bidirectional excitation color wheel, and the first right-angle reflector, the second color mirror and the second reflector are arranged close to the second working surface of the bidirectional excitation color wheel.

2. The laser light source system with a right-angle reflector and a bidirectional excitation color wheel according to claim 1, characterized in that: The angle extension line between the second fluorescent area and the third light-transmitting area passing through the center of the circle is consistent with the angle extension line passing through the center of the circle of the second light-transmitting area.

3. The laser light source system with a right-angle reflector and a bidirectional excitation color wheel according to claim 1, characterized in that: The second fluorescent area of ​​the third working ring is coated with red fluorescent powder or yellow fluorescent powder to form a red fluorescent area or a yellow fluorescent area.

4. The laser light source system with a right-angle reflector and a bidirectional excitation color wheel according to claim 1, characterized in that: When the second fluorescent area is coated with yellow fluorescent powder, a red filter is arranged between the second reflecting mirror and the third color mirror.

5. The laser light source system with a right-angle reflector and a bidirectional excitation color wheel according to claim 1, characterized in that: The first fluorescent area of ​​the first working ring is coated with green fluorescent powder.

6. The laser light source system with a right-angle reflector and a bidirectional excitation color wheel according to claim 1, characterized in that: The first fluorescent area and the first light-transmitting area are arranged to be one or more and are distributed crosswise, that is, they include a plurality of first fluorescent areas and first light-transmitting areas.

7. The laser light source system with a right-angle reflector and a bidirectional excitation color wheel according to claim 1, characterized in that: The second fluorescent area and the third light-transmitting area are set to be one or more cross-distributed, wherein the distribution of one or more of the second fluorescent areas corresponds to the distribution of the first light-transmitting areas, and the sum of the angles of the multiple second fluorescent areas distributed at intervals and the multiple third light-transmitting areas distributed at intervals is equal to the sum of the angles of the multiple first light-transmitting areas distributed at intervals.

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