Laser light source system of projector

Abstract

The utility model relates to a laser light source system of a projector, which comprises a light guide pipe, a light machine system and at least two laser light source modules capable of emitting red, green and blue light beams, and the light guide pipe is arranged on an output light path of each laser light source module. A focusing lens assembly capable of focusing light beams emitted by the laser light source modules to the light guide pipe is arranged on a projection light path between the light guide pipe and each laser light source module. The utility model has the characteristics that: through the arrangement of the at least two laser light source modules capable of emitting red, green and blue light beams, the outputs of the plurality of laser light source modules are combined, so that the brightness is improved on the premise of not increasing the power of a single laser, and the problem of brightness limitation caused by overheating of the fluorescent powder wheel is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of projection equipment, in particular to a laser light source system of a projector. Background Art

[0002] In recent years, with the continuous advancement of projection technology, projectors have become a common device in a variety of fields, including home entertainment, education, and business presentations. Laser projectors, in particular, have gained popularity due to their superior brightness, long lifespan, and wider color gamut. With the continued evolution of digital light processing technology, market requirements for projector performance indicators such as brightness, contrast, color accuracy, and saturation are also increasing.

[0003] In traditional laser projection technology, a laser is typically used to excite a phosphor wheel, causing it to emit light of different wavelengths. To increase the brightness of laser projection systems, a common approach is to increase the laser power, creating a higher-power light source. However, during this process, some of the energy is dissipated as heat, causing the metal disk of the phosphor wheel to heat up. As the temperature rises, the luminous efficiency of the phosphor gradually decreases. When the temperature reaches the operating limit of the phosphor, its luminous efficiency drops sharply, potentially even causing the phosphor to fail or even be damaged. Therefore, this method of increasing the brightness of laser projection systems is limited by performance degradation caused by thermal effects, which limits the maximum brightness level that the system can achieve. Utility Model Content

[0004] The purpose of the utility model is to provide a laser light source system for a projector, which improves the output brightness of the laser light source system through structural optimization.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a laser light source system for a projector, comprising a light guide, an optical system, and at least two laser light source modules capable of emitting red, green, and blue light beams. The light guide is arranged on the output light path of each laser light source module, and a focusing lens assembly capable of focusing the light beam emitted by the laser light source module onto the light guide is provided on the projection light path between the light guide and each laser light source module.

[0006] As a further optimization solution of the present invention, the light emitting side of at least one laser light source module is arranged opposite to the light receiving side of the light guide, so that the output light beam of the laser light source module can directly enter the light guide.

[0007] As a further optimization solution of the present invention, a first reflection component is provided on the projection light path between at least one of the laser light source modules and the light guide.

[0008] As a further optimization solution of the present invention, the first reflecting component includes a first reflecting mirror capable of reflecting the light beam emitted by the laser light source module, and a second reflecting mirror arranged in the reflecting light path of the first reflecting mirror and capable of reflecting the light beam reflected by the first reflecting mirror to the light receiving side of the light guide.

[0009] As a further optimization solution of the present invention, a prism assembly is provided between the light pipe and the optical machine system, as well as a second reflection assembly located in the light emitting direction of the light pipe and capable of bending the light beam so as to enter the prism assembly.

[0010] As a further optimization scheme of the present invention, the prism assembly includes an upper prism and a lower prism, the lower prism is provided with a left prism surface, a first oblique prism surface and a bottom prism surface, the upper prism is provided with a top prism surface, a second oblique prism surface and a right prism surface, the reflected light path of the second reflective assembly passes through the left prism surface, and the light receiving side of the optical machine system is facing the top prism surface.

[0011] As a further optimization scheme of the present invention, the laser light source module includes a laser and a phosphor wheel. A dichroic film is provided between the laser and the phosphor wheel, which can allow the light beam emitted by the laser to pass through and can reflect the light generated by the excitation of the phosphor wheel. The laser light source module also includes a third reflection component that can reflect the light beam passing through the phosphor wheel. The output light path of the third reflection component is aligned with the reflection light path of the dichroic film.

[0012] As a further optimization solution of the present invention, the laser light source system further includes a prism element capable of reflecting the light beam emitted by each laser light source module to the light guide tube.

[0013] As a further optimization solution of the present invention, the number of the laser light source modules is four, and the prism element has four reflecting surfaces.

[0014] As a further optimization solution of the present invention, an imaging lens assembly capable of converging the output light beams of multiple laser light source modules is provided on the projection light path of the light incident side of the light pipe.

[0015] Compared with the existing technology, the present invention has the following advantages: by setting up at least two laser light source modules that can emit red, green and blue light beams, the outputs of multiple laser light source modules are merged, thereby improving the brightness without increasing the power of a single laser, avoiding the brightness limitation problem caused by overheating of the phosphor wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0017] Figure 1This is a schematic diagram of the structure of the utility model Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the laser light source module in the present utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0020] Figure 4 It is a structural diagram of the prism in the utility model. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings.

[0022] like Figures 1 to 4 As shown, the utility model discloses a laser light source system for a projector, comprising a light guide 1, an optical system 2, and at least two laser light source modules 3 capable of emitting red, green, and blue light beams. The light guide 1 is arranged on the output light path of each laser light source module 3, and a focusing lens assembly 4 capable of focusing the light beam emitted by the laser light source module 3 onto the light guide 1 is provided on the projection light path between the light guide 1 and each laser light source module 3.

[0023] Light pipe 1 serves as a light transmission channel, combining the light beams from different laser light source modules 3 and directing them to optical mechanical system 2. Optical mechanical system 2 modulates the light beams transmitted through light pipe 1 into the desired image and projects it onto screen 10. Laser light source modules 3 can emit red, green, and blue laser beams, which can be combined in varying proportions to generate various other colors, achieving full-color display. Multiple laser light source modules 3 can be stacked to increase the overall brightness of the system. A focusing lens assembly 4 focuses the laser beams emitted from the laser light source modules 3 onto light pipe 1, ensuring efficient transmission and utilization of light.

[0024] By providing at least two laser light source modules 3 capable of emitting red, green, and blue light beams, the outputs of multiple laser light source modules 3 are combined, thereby improving the brightness without increasing the power of a single laser 31, thereby avoiding the brightness limitation problem caused by overheating of the phosphor wheel 32.

[0025] The light emitting side of at least one laser light source module 3 is arranged opposite to the light receiving side of the light guide 1 , so that the output light beam of the laser light source module 3 can be directly incident on the light guide 1 .

[0026] In the embodiment, the laser light source module 3 is tilted so that the laser beam can directly enter the light guide 1, thereby reducing the loss of light energy during transmission, reducing production costs, and improving the reliability and stability of the system.

[0027] A first reflective component 5 is provided on the projection light path between the at least one laser light source module 3 and the light guide 1 .

[0028] High-power laser light source modules 3 are generally large. If all the output beams from these modules were to be directed directly into the light guide 1, this could lead to spatial layout difficulties. However, the first reflector assembly 5 is designed to reflect the beams from at least one laser light source module 3 onto the light guide 1. This allows for optimized spatial layout by simply setting appropriate deflection angles. This improves layout flexibility and avoids interference between structures.

[0029] The first reflective assembly 5 includes a first reflector 51 capable of reflecting the light beam emitted by the laser light source module 3 , and a second reflector 52 provided on the reflection light path of the first reflector 51 and capable of reflecting the light beam reflected by the first reflector 51 to the light receiving side of the light pipe 1 .

[0030] The dual-reflector arrangement of the first reflector 51 and the second reflector 52 provides higher layout flexibility, and can implement a more complex optical path design within a limited space.

[0031] A prism assembly 6 and a second reflection assembly 7 located in the light emitting direction of the light pipe 1 and capable of deflecting the light beam so as to enter the prism assembly 6 are provided between the light pipe 1 and the optical mechanical system 2 .

[0032] By setting the prism assembly 6 and the second reflective assembly 7, the light path can be effectively folded. Even if all the laser light source modules 3 output light beams directly into the light guide 1, the structure of the entire projection system can be made more compact and convenient for spatial arrangement.

[0033] The prism assembly 6 includes an upper prism 61 and a lower prism 62. The lower prism 62 is provided with a left prism surface 621, a first oblique prism surface 622 and a bottom prism surface 623. The upper prism 61 is provided with a top prism surface 611, a second oblique prism surface 612 and a right prism surface 613. The reflected light path of the second reflecting assembly 7 passes through the left prism surface 621, and the light receiving side of the optical machine system 2 is facing the top prism surface 611.

[0034] The arrangement of the upper prism 61 and the lower prism 62 optimizes the optical path and reduces light loss by using a combination of multiple prism surfaces, thereby improving layout flexibility and enhancing system reliability and maintainability.

[0035] The laser light source module 3 includes a laser 31 and a phosphor wheel 32. A dichroic film 33 is provided between the laser 31 and the phosphor wheel 32, which can allow the light beam emitted by the laser 31 to pass through and can reflect the light generated by the phosphor wheel 32. The laser light source module 3 also includes a third reflective component 34 that can reflect the light beam passing through the phosphor wheel 32. The output light path of the third reflective component 34 is aligned with the reflection light path of the dichroic film 33.

[0036] The laser 31 emits a monochromatic laser beam for exciting the phosphor wheel 32. In the embodiment, the color of the laser beam emitted by the laser 31 is blue. When irradiated by the excitation beam emitted by the laser 31, the phosphor wheel 32 emits light of different colors. In the embodiment, the phosphor wheel 32 can produce red and green beams after being excited by the blue laser. The dichroic plate 33 allows the excitation beam emitted by the laser 31 to pass through and illuminate the phosphor wheel 32, and reflects the colored light generated by the phosphor wheel 32. The third reflective component 34 reflects the unabsorbed portion of the excitation light that passes through the phosphor wheel 32 back to the direction of the dichroic plate 33, so that the portion of the excitation light is aligned with the reflection light path of the dichroic plate 33, thereby realizing the function of the laser light source module 3 to emit red, green and blue beams.

[0037] The laser light source system further includes a prism element 8 capable of reflecting the light beam emitted by each laser light source module 3 to the light pipe 1 .

[0038] The prism element 8 can effectively converge light beams from different directions and guide them to the light guide 1, thereby reducing light loss and improving light energy utilization. Figure 3 As shown, in one embodiment, the prism element 8 is a triangular prism. By using the prism element 8, an efficient optical path layout can be achieved in a limited space, making the entire system more compact.

[0039] There are four laser light source modules 3 , and the prism element 8 has four reflecting surfaces.

[0040] like Figure 4 As shown, in one embodiment, the prism element 8 is in the shape of an oblique triangular prism, which has a reflective surface composed of four triangles or trapezoids, and can cooperate with four laser light source modules 3 to enable the four laser light source modules 3 to work together, significantly improving the overall brightness of the system.

[0041] An imaging lens assembly 9 capable of converging the output light beams of the plurality of laser light source modules 3 is provided on the projection light path of the light incident side of the light guide 1 .

[0042] The design of the imaging lens assembly 9 can ensure that the light beam has better uniformity when entering the light pipe 1, thereby improving the quality of the final image.

Claims

1. A laser light source system for a projector, characterized in that: The invention comprises a light pipe (1), an optical machine system (2), and at least two laser light source modules (3) capable of emitting red, green, and blue light beams. The light pipe (1) is provided on the output light path of each laser light source module (3), and a focusing lens assembly (4) capable of focusing the light beam emitted by the laser light source module (3) onto the light pipe (1) is provided on the projection light path between the light pipe (1) and each laser light source module (3).

2. The laser light source system for a projector according to claim 1, characterized in that: The light-emitting side of at least one laser light source module (3) is arranged opposite to the light-receiving side of the light guide tube (1), so that the output light beam of the laser light source module (3) can be directly injected into the light guide tube (1).

3. The laser light source system for a projector according to claim 2, wherein: A first reflection component (5) is provided on the projection light path between at least one of the laser light source modules (3) and the light guide (1).

4. The laser light source system for a projector according to claim 3, wherein: The first reflecting assembly (5) comprises a first reflecting mirror (51) capable of reflecting a light beam emitted by the laser light source module (3), and a second reflecting mirror (52) disposed on a reflecting light path of the first reflecting mirror (51) and capable of reflecting the light beam reflected by the first reflecting mirror (51) to the light receiving side of the light guide (1).

5. The laser light source system for a projector according to claim 2, wherein: A prism assembly (6) and a second reflection assembly (7) located in the light emitting direction of the light guide (1) and capable of deflecting the light beam so as to enter the prism assembly (6) are provided between the light guide (1) and the optical machine system (2).

6. The laser light source system for a projector according to claim 5, characterized in that: The prism assembly (6) comprises an upper prism (61) and a lower prism (62); the lower prism (62) is provided with a left prism surface (621), a first oblique prism surface (622), and a bottom prism surface (623); the upper prism (61) is provided with a top prism surface (611), a second oblique prism surface (612), and a right prism surface (613); the reflected light path of the second reflective assembly (7) passes through the left prism surface (621); and the light receiving side of the optical machine system (2) faces the top prism surface (611).

7. The laser light source system for a projector according to claim 1, characterized in that: The laser light source module (3) comprises a laser (31) and a phosphor wheel (32); a dichroic plate (33) is provided between the laser (31) and the phosphor wheel (32), the dichroic plate (33) being capable of allowing a light beam emitted by the laser (31) to pass through and being capable of reflecting light generated by the phosphor wheel (32); the laser light source module (3) further comprises a third reflecting component (34) being capable of reflecting the light beam passing through the phosphor wheel (32); an outgoing light path of the third reflecting component (34) is aligned with a reflected light path of the dichroic plate (33).

8. The laser light source system for a projector according to claim 1, wherein: The laser light source system further comprises a prism element (8) capable of reflecting the light beam emitted by each laser light source module (3) to the light guide tube (1).

9. The laser light source system for a projector according to claim 8, characterized in that: The number of the laser light source modules (3) is four, and the prism element (8) has four reflecting surfaces.

10. The laser light source system for a projector according to claim 1, characterized in that: An imaging lens assembly (9) capable of converging output light beams of multiple laser light source modules (3) is provided on the projection light path on the light entrance side of the light guide (1).

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