A laser light source system with a bidirectional excitation color wheel

Abstract

The invention discloses a laser light source system with a bidirectional excitation color wheel, comprising a light source excitation unit for generating blue laser, a reflector group, a color filter group, a relay lens group and a bidirectional excitation color wheel; the reflector group comprises a first reflector, a second reflector, a third reflector and a fourth reflector for reflecting all color lights; the color filter group comprises a first color filter for transmitting blue light and reflecting green light, a second color filter for reflecting blue light and transmitting red light or yellow light, and a third color filter for reflecting red light and transmitting blue light or green light; the relay lens group comprises a first relay lens and a second relay lens; a first relay lens located between the first color filter and the bidirectional excitation color wheel, and a second relay lens located between the first 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 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 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 bidirectional excitation color wheel, which separates yellow light and green light and then filters out red light to obtain a high-efficiency three-primary color light source.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a laser light source system with a bidirectional excitation color wheel, comprising a light source excitation unit for generating blue laser, a reflector group, a color filter group, a relay lens group and a bidirectional excitation color wheel;

[0007] The reflector group includes a first reflector, a second reflector, a third reflector and a fourth reflector for reflecting all color lights;

[0008] The color filter set includes a first color filter for transmitting blue light and reflecting green light, a second color filter for reflecting blue light and transmitting red light or yellow light, and a third color filter for reflecting red light and transmitting blue light or green 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 plate and the bidirectional excitation color wheel, and the second relay lens is located between the first reflector and the bidirectional excitation color wheel;

[0010] 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 inside 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 mirror reflection area;

[0011] The second reflector, the first color plate and the third color plate are distributed in a horizontal state, and the first color plate and the third color plate are arranged close to the first working surface of the bidirectional excitation color wheel, and the first reflector, the second color plate, the third reflector and the fourth reflector are arranged close to the second working surface of the bidirectional excitation color wheel.

[0012] Furthermore, the first reflector is arranged in front of the first light-transmitting area of ​​the bidirectional laser color wheel.

[0013] The second color filter is arranged between the bidirectional excitation color wheel and the third reflector, wherein the third reflector is arranged in front of the reflection light path of the second color filter.

[0014] The fourth reflector is distributed above the light path reflected by the third reflector, and the third color filter is arranged in front of the light path reflected by the fourth reflector.

[0015] Furthermore, 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.

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

[0017] A red filter is arranged between the third reflecting mirror and the fourth reflecting mirror.

[0018] 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 mirror reflection area of ​​the third working ring.

[0019] The angle extension line of the second fluorescent area and the mirror reflection area passing through the center of the circle is consistent with the angle extension line of the second light-transmitting area passing through the center of the circle.

[0020] When the present invention is working, the light source excitation unit emits a blue laser, which is sequentially transmitted through the first color filter and the first relay lens to reach the first working ring of the first working surface of the bidirectional excitation color wheel. When the blue light contacts the first fluorescent area of ​​the first working ring, green light is generated and reflected to the first color filter, and is reflected again to the third color filter through the first color filter, and is transmitted through the third color filter to output green light to the outside of the laser light source system. When the blue light contacts the first light-transmitting area of ​​the first working ring, the transmitted blue light is reflected by the first reflector, transmitted through the second relay lens, and reaches the third color filter of the second working surface of the bidirectional excitation color wheel. Working ring, when blue light contacts the second fluorescent area of ​​the third working ring (the second fluorescent area is coated with red fluorescent powder at this time), red light is generated, which is transmitted by the second color filter and reflected by the third reflector, and then reflected by the fourth reflector to reach the third color filter, and then reflected by the third color filter to output red light to the light source system; when blue light contacts the mirror reflection area of ​​the third working ring, the reflected blue light reaches the second color filter through the second relay lens, is reflected by the second color filter to the reflector, is transmitted by the first color filter and the third color filter, and outputs blue light to the light source system, thereby realizing the sequential output of green light, red light or yellow light and blue light by the light source system.

[0021] In the above working process, when yellow phosphor is used in the second fluorescent area, the red light is generated as follows: when blue light contacts the first light-transmitting area of ​​the first working ring, the transmitted blue light is reflected by the first reflector, transmitted by the second relay lens, and reaches the third working ring of the second working surface of the bidirectional excitation color wheel. When the blue light contacts the second fluorescent area of ​​the third working ring, yellow light is generated, which is transmitted by the second color filter and reflected by the third reflector, filtered by the red filter, and then reflected by the fourth reflector to reach the third color filter. After being reflected by the third color filter, red light is output to the light source system.

[0022] The beneficial effects of the present invention are as follows: by adopting the method of bidirectional excitation color wheel, the yellow light and green light generated by the blue laser exciting the yellow phosphor and the green phosphor are respectively located in different light paths, the traditional color filter wheel is eliminated, a red filter is added to the light path of the yellow light, and the red light is filtered from the yellow light, which 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. 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

[0023] Figure 1 It is a schematic diagram of the working principle of the present invention.

[0024] Figure 2 yes Figure 1 Another embodiment of .

[0025] 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.

[0026] Attached Figure 1-3 In the figure, 10. bidirectional excitation color wheel, 11. first light transmission area, 12. first fluorescent area, 13. second fluorescent area, 14. mirror reflection area, 15. second light transmission area, 20. light source excitation unit, 31. first color film, 32. first reflector, 33. second color film, 34. second reflector, 35. third reflector, 36. fourth reflector, 37. third color film, 41. first relay lens, 42. second relay lens, 43. light source output unit, 44. motor. DETAILED DESCRIPTION Example

[0027] Attached Figure 1 and Figure 3 As a first embodiment of the present invention, a laser light source system with a bidirectional excitation color wheel is disclosed, comprising a light source excitation unit 20 for generating blue laser light, a reflector group, a color filter group, a relay lens group and a bidirectional excitation color wheel;

[0028] The reflector group includes a first reflector 32, a second reflector 34, a third reflector 35 and a fourth reflector 36 for reflecting all color lights;

[0029] The color filter set includes a first color filter 31 for transmitting blue light and reflecting green light, a second color filter 33 for reflecting blue light and transmitting red light or yellow light, and a third color filter 37 for reflecting red light and transmitting blue light or green light;

[0030] The relay lens group includes a first relay lens 41 located between the first color plate 31 and the bidirectional excitation color wheel 10, and a second relay lens 42 located between the first reflector 32 and the bidirectional excitation color wheel 10;

[0031] 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 11 and a first fluorescent area 12; the second working surface has a second working ring and a third working ring located inside the second working ring, the second light-transmitting area 15 is a projection of the first light-transmitting area 11 on the second working surface, the second working ring and the first working ring have the same second light-transmitting area 15, the third working ring comprises a second fluorescent area 13 and a mirror reflection area 14; Figure 3 The bidirectional excitation color wheel shown, the left side of the figure is the first working surface, and the right side of the figure is the second working surface;

[0032] The second reflector 34, the first color plate 31 and the third color plate 37 are distributed in a horizontal state, and the first color plate 31 and the third color plate 37 are arranged close to the first working surface of the bidirectional excitation color wheel 10, the first reflector 32, the second color plate 33, the third reflector 35 and the fourth reflector 36 are arranged close to the second working surface of the bidirectional excitation color wheel 10, the first reflector 32 is arranged in front of the first light-transmitting area 11 of the bidirectional laser color wheel 10, the second color plate 33 is arranged between the bidirectional excitation color wheel 10 and the third reflector 35, wherein the third reflector 35 is arranged in front of the reflected light path of the second color plate 33, the fourth reflector 36 is distributed above the reflected light path of the third reflector 35, and the third color plate 37 is arranged in front of the reflected light path of the fourth reflector 36.

[0033] The second fluorescent area 13 of the third working ring is coated with red fluorescent powder to form a red fluorescent area.

[0034] 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, and the rotating shaft is driven by a motor.

[0035] The first fluorescent area 12 of the first working ring 1 is coated with green fluorescent powder.

[0036] The angle of the second light-transmitting area 15 of the second working ring is equal to the sum of the angles of the second fluorescent area 13 and the mirror reflection area 14 of the third working ring.

[0037] The angle extension line of the second fluorescent area 13 and the mirror reflection area 14 passing through the center of the circle is consistent with the angle extension line of the second light-transmitting area 15 passing through the center of the circle.

[0038] The first light-transmitting area 11 and the second light-transmitting area 15 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.

[0039] When the present embodiment is working, the light source excitation unit 20 emits a blue laser, which is sequentially transmitted through the first color filter 31 and the first relay lens 41 to reach the first working ring of the first working surface of the bidirectional excitation color wheel 10. When the blue light contacts the first fluorescent area 12 of the first working ring, green light is generated and reflected to the first color filter 31, and is reflected again to the third color filter 37 through the first color filter 31, and is transmitted through the third color filter 37 to output green light to the laser light source system; when the blue light contacts the first light-transmitting area 11 of the first working ring, the transmitted blue light is reflected by the first reflector 32, and is transmitted through the second relay lens 42 to reach the bidirectional excitation color wheel 1 When the blue light contacts the second fluorescent area 13 of the third working ring on the second working surface, red light is generated, which is transmitted by the second color filter 33 and reflected by the third reflector 35, and then reflected by the fourth reflector 36 to reach the third color filter 37, and then reflected by the third color filter 37 to output red light to the light source system; when the blue light contacts the mirror reflection area 14 of the third working ring, the reflected blue light reaches the second color filter 33 through the second relay lens 42, is reflected by the second color filter 33 to the reflector 34, is transmitted by the first color filter 31 and the third color filter 37, and then outputs blue light to the light source system, thereby realizing the sequential output of green light, red light and blue light by the light source system. Example

[0040] Attached Figure 2 and Figure 3 As a second embodiment of the present invention, a laser light source system with a bidirectional excitation color wheel is disclosed, comprising a light source excitation unit 20 for generating blue laser, a reflector group, a color filter group, a relay lens group and a bidirectional excitation color wheel;

[0041] The structure is different from that of the first embodiment in that: the second fluorescent area 13 of the third working ring is coated with yellow fluorescent powder to form a yellow fluorescent area; and a red filter is arranged between the third reflector 35 and the fourth reflector 36 to filter out red light.

[0042] The difference from the optical path of embodiment 1 lies in the way red light is generated: when blue light contacts the second fluorescent area 13, that is, the fluorescent area is coated with yellow fluorescent powder at this time, yellow light is generated, which is transmitted through the second relay lens 42, reaches the second color plate 33 (that is, the second color plate at this time reflects blue light and transmits yellow light) and is reflected by the third reflector 35, reaches the red filter 50, filters out the red light, and then passes through the fourth reflector 36 to reach the third color plate 37, is reflected by the third color plate 37, and outputs red light to the light source system.

[0043] Schematic diagram of the optical path of a blue laser exciting yellow phosphor and green phosphor to produce yellow light or green light in the prior art. Blue light is used to excite yellow light and green light, and then red light is produced through a red filter. That is, the blue laser hitting the fluorescent color wheel will excite the green phosphor and the yellow phosphor to produce green light and yellow light respectively, and then red light is obtained by filtering the yellow light. The green light and yellow light produced by the 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 adopt 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 timing segment, 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 filtering area. Otherwise, the output of different colors may be superimposed, the color changes, and the three primary colors cannot be formed in a normal timing output. The present invention can solve this problem.

[0044] 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 with a bidirectional excitation color wheel, characterized in that: It includes a light source excitation unit for generating blue laser, a reflector group, a color filter group, a relay lens group and a bidirectional excitation color wheel; The reflector group includes a first reflector, a second reflector, a third reflector and a fourth reflector for reflecting all color lights; The color filter set includes a first color filter for transmitting blue light and reflecting green light, a second color filter for reflecting blue light and transmitting red light or yellow light, and a third color filter for reflecting red light and transmitting blue light or green 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 plate and the bidirectional excitation color wheel, and the second relay lens is located between the first reflection plate and the bidirectional excitation color wheel; The second color filter is arranged between the bidirectional excitation color wheel and the third reflector, wherein the third reflector is arranged in front of the reflection light path of the second color filter; The bidirectional excitation color wheel comprises a first working surface and a second working surface arranged at 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, and the first reflector is arranged in front of the first light-transmitting area of ​​the bidirectional laser color wheel; The second working surface has a second working ring and a third working ring located inside the second working ring, the second working ring and the first working ring have a second light-transmitting area of ​​the same area, and the third working ring includes a second fluorescent area and a mirror reflection area; The second reflector, the first color plate and the third color plate are distributed in a horizontal state, and the first color plate and the third color plate are arranged close to the first working surface of the bidirectional excitation color wheel, and the first reflector, the second color plate, the third reflector and the fourth reflector are arranged close to the second working surface of the bidirectional excitation color wheel.

2. A laser light source system with a bidirectional excitation color wheel according to claim 1, characterized in that: The fourth reflector is distributed above the light path reflected by the third reflector, and the third color filter is arranged in front of the light path reflected by the fourth reflector.

3. The laser light source system with 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 bidirectional excitation color wheel according to claim 1, characterized in that: The first fluorescent area 12 of the first working ring 1 is coated with green fluorescent powder.

5. The laser light source system with a bidirectional excitation color wheel according to claim 1, characterized in that: A red filter is arranged between the third reflecting mirror and the fourth reflecting mirror.

6. The laser light source system with a bidirectional excitation color wheel according to claim 1, characterized in that: 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 mirror reflection area of ​​the third working ring.

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

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