High-luminous-efficiency laser light source projection system
By introducing a second laser and optimizing the optical path design into the laser projection system, the problem of low light energy utilization in traditional laser projectors is solved, and efficient light energy conversion and color enhancement are achieved.
Patent Information
- Application Number
- CN202422929021.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Traditional laser projectors have low light energy utilization, especially the red light generation area, which leads to low light energy efficiency.
The first laser and the second laser are combined. The first laser excites the fluorescent wheel to produce red, yellow and green light, and the second laser directly provides red light. The optical path design is optimized through the dichroic plate and reflective components to increase the proportion of red light and improve the light energy conversion efficiency.
The light energy conversion efficiency is improved, the cost is reduced, and the red light saturation and color quality of the projected image are enhanced.
Smart Images
Figure CN223401132U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of laser projection, in particular to a high-light-efficiency laser light source projection system. Background Art
[0002] In recent years, with the continuous advancement of projection technology, projectors have been widely used in various fields such as home entertainment, education and training, and business presentations. Among them, laser projectors have occupied an increasingly important position in the market due to their significant advantages such as high brightness, long life, and wide color gamut.
[0003] Traditional laser projection light sources typically use a laser to excite phosphors on a phosphor wheel, converting them into visible light of varying wavelengths. However, this excitation primarily produces yellow and green light, forcing the projector to extract the red light required from the yellow light. This process results in low light energy utilization, typically only 20% to 25%. To ensure a high red light ratio in the projected image, a larger area or angle on the phosphor wheel is typically allocated to the red light generation region, compressing the areas generating other colors, thus impacting the overall light energy efficiency of the light source system. Utility Model Content
[0004] The purpose of the present invention is to provide a high-light-efficiency laser light source projection system, thereby solving the above-mentioned problems.
[0005] To solve the above technical problems, the present invention provides the following technical solution: a high-light-efficiency laser light source projection system, comprising a first laser capable of emitting a blue light beam; a fluorescent wheel disposed in an outgoing light path of the first laser; the fluorescent wheel having a fluorescent region that can be excited by the blue light beam to produce red, yellow, and green light beams, and a transmissive region through which the light beam emitted by the first laser passes; a first dichroic filter disposed in a projection light path between the first laser and the fluorescent wheel, capable of transmitting the light beam emitted by the first laser and reflecting the light excited by the fluorescent wheel; an integrator disposed in a reflective light path of the first dichroic filter; the projection system further comprising a second laser capable of emitting a red light beam, the red light beam emitted by the second laser having a wavelength greater than the wavelength of the red light beam excited by the fluorescent wheel; the second laser disposed opposite the integrator; a reflective assembly disposed in the transmissive light path of the fluorescent wheel, capable of reflecting the light beam transmitted through the fluorescent wheel; a second dichroic filter disposed in an outgoing light path of the reflective assembly, capable of reflecting the outgoing light beam toward the integrator; the first and second dichroic filters both disposed in the outgoing light path of the second laser and capable of transmitting the light beam emitted by the second laser.
[0006] As a further optimization solution of the present invention, the fluorescent area includes a fan-shaped red light area, a yellow light area, and a green light area, and the central angle A of the red light area ranges from 50° to 60°.
[0007] As a further optimization solution of the present invention, the reflection assembly includes a first reflector arranged on the transmission light path of the fluorescent wheel, a second reflector is arranged on the reflection light path of the first reflector, and the second dichroic plate is arranged on the reflection light path of the second reflector.
[0008] As a further optimization solution of the present invention, a first converging lens is provided on the projection light path between the fluorescent wheel and the first reflector, and a second converging lens is provided on the projection light path between the first reflector and the second reflector.
[0009] As a further optimization solution of the present invention, a first condensing lens group is provided on the projection light path between the first laser and the first dichroic plate, and a second condensing lens group is provided on the projection light path between the second laser and the second dichroic plate.
[0010] As a further optimization solution of the present invention, a collimating lens group is provided on the projection light path between the first dichroic plate and the fluorescent wheel.
[0011] As a further optimization solution of the present invention, a third converging lens is provided on the projection light path between the integrator rod and the first dichroic film.
[0012] Compared with the prior art, the utility model has the following advantages:
[0013] 1. By setting up a second laser capable of emitting a red light beam, the angle at which the red light is intercepted in the fluorescent wheel is reduced, while the proportion of red light in the optical machine system is increased, thereby improving the efficiency of light energy conversion;
[0014] 2. The second laser and the fluorescent wheel jointly provide a red light source for the optical machine system, which has a lower power requirement for the second laser and reduces costs;
[0015] 3. By setting up a second laser that emits a red light beam with a wavelength greater than the wavelength of the red light beam generated by the fluorescent wheel, the first dichroic filter can distinguish and process the red light produced by the two while increasing the saturation of the red light, thereby improving the color of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural diagram of the utility model;
[0017] Figure 2 This is a schematic structural diagram of the fluorescent wheel in the present utility model. DETAILED DESCRIPTION
[0018] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings.
[0019] like Figure 1 and Figure 2 As shown, the utility model discloses a high-light-efficiency laser light source projection system, comprising a first laser 1 capable of emitting a blue light beam, a fluorescent wheel 2 provided on the outgoing light path of the first laser 1, the fluorescent wheel 2 having a fluorescent area 21 capable of being excited by the blue light beam to produce red, yellow, and green light beams, and a transmission area 22 for the light beam emitted by the first laser 1 to pass through, a first dichroic plate 31 capable of being transmitted by the light beam emitted by the first laser 1 and capable of reflecting the light excited by the fluorescent wheel 2, and a reflective light path provided on the first dichroic plate 31. There is an integrator rod 4, and the projection system also includes a second laser 5 capable of emitting a red light beam. The wavelength of the red light beam emitted by the second laser 5 is greater than the wavelength of the red light beam excited by the fluorescent wheel 2. The second laser 5 is arranged opposite to the integrator rod 4. A reflective component 6 capable of reflecting the light beam passing through the fluorescent wheel 2 is provided on the transmission light path of the fluorescent wheel 2. A second dichroic plate 32 capable of reflecting the outgoing light beam to the integrator rod 4 is provided on the outgoing light path of the reflective component 6. The first dichroic plate 31 and the second dichroic plate 32 are both arranged on the outgoing light path of the second laser 5 and can allow the light beam emitted by the second laser 5 to pass through.
[0020] The first laser 1 emits a blue light beam, serving as the primary light source for stimulating the phosphor wheel 2 to produce other colored light. The phosphor wheel 2 comprises a phosphor region 21 and a transmissive region 22. The phosphor region 21 is excited by the blue light beam to produce red, yellow, and green light beams. The transmissive region 22 allows a portion of the blue light beam to pass through and reflects the blue light beam that has passed through the phosphor wheel 2 via a reflective assembly 6. A first dichroic filter 31 reflects the red, yellow, and green light beams generated by the phosphor wheel 2 toward an integrator rod 4. A second dichroic filter 32 reflects the blue light beam, after reflection from the reflective assembly 6, toward the integrator rod 4. The integrator rod 4 homogenizes the received light beams, ensuring brightness and color uniformity of the projected image and improving image quality. A second laser 5 is positioned opposite the integrator rod 4. The first and second dichroic filters 31, 32 allow the light beam emitted by the second laser 5 to pass through, allowing the light beam to be received by the integrator rod 4. The second laser 5 emits a red light beam with a wavelength greater than the red light beam generated by the phosphor wheel 2, complementing the red light generated by the phosphor wheel and ensuring the proportion and quality of red light in the projected image.
[0021] In the embodiment, the wavelength spectrum of the red light beam generated by the excitation of the fluorescent wheel 2 is below 610 nm, and the wavelength spectrum of the red light beam emitted by the second laser 5 is around 640 nm, so that the first dichroic plate 31 can reflect the red light beam generated by the excitation of the fluorescent wheel 2 and transmit the red light beam emitted by the second laser 5 through coating.
[0022] By setting up a second laser 5 capable of emitting a red light beam, the angle of interception of red light in the fluorescent wheel 2 is reduced, while the proportion of red light in the optical system is increased, thereby improving the efficiency of light energy conversion; the second laser 5 and the fluorescent wheel 2 jointly provide a red light source for the optical system, and the power requirement of the second laser is low, thereby reducing costs; by setting up a second laser 5 with a red light beam having a wavelength greater than the wavelength of the red light beam excited by the fluorescent wheel 2, the first dichroic plate 31 can distinguish and process the red light generated by the two, while improving the saturation of the red light, thereby improving the color of the entire system.
[0023] The fluorescent area 21 includes a fan-shaped red area 211 , a yellow area 212 , and a green area 213 . The central angle A of the red area 211 ranges from 50° to 60°.
[0024] Red light zone 211 generates red light after being excited by a blue light beam. Compared to traditional fluorescent wheels, which require a wheel angle of approximately 100° to intercept red light, when the second laser 5 and red light zone 211 jointly provide the red light source for the optical-mechanical system, a central angle A of red light zone 211 within the range of 50° to 60° can meet the system's required proportion of red light brightness. This allows yellow light zone 212 and green light zone 213 to capture a wider angle, thereby increasing the overall system's light efficiency by 30% to 40%.
[0025] The reflection assembly 6 includes a first reflector 61 provided on the transmission light path of the fluorescent wheel 2 , a second reflector 62 provided on the reflection light path of the first reflector 61 , and the second dichroic plate 32 provided on the reflection light path of the second reflector 62 .
[0026] The blue light beam is reflected by the first and second reflectors 61 and 62 and directed to the second dichroic filter 32 . In the embodiment, the second dichroic filter 32 is a blue-reflecting and red-transmitting filter. The blue light beam is reflected by the second dichroic filter 32 to the integrator rod 4 .
[0027] A first converging lens 71 is provided on the projection light path between the fluorescent wheel 2 and the first reflector 61 , and a second converging lens 72 is provided on the projection light path between the first reflector 61 and the second reflector 62 .
[0028] By disposing the first converging lens 71 and the second converging lens 72 , the scattering of the light beam during the transmission process is reduced, and the utilization rate of light energy is improved.
[0029] A first condensing lens group 81 is provided on the projection light path between the first laser 1 and the first dichroic plate 31 , and a second condensing lens group 82 is provided on the projection light path between the second laser 5 and the second dichroic plate 32 .
[0030] The light beams emitted by the first laser 1 and the second laser 5 are projected, narrowed, and collimated by the first condensing lens group 81 and the second condensing lens group 82 to reduce the scattering and loss of the light beams during transmission, thereby improving the utilization rate of light energy and ensuring that the light beams can reach the target position more accurately, thereby improving the stability and reliability of the system.
[0031] A collimating lens group 9 is provided on the projection light path between the first dichroic plate 31 and the fluorescent wheel 2 .
[0032] The collimating lens group 9 can collimate the red, yellow and green light beams generated by the fluorescent wheel 2 to reduce the divergence of the light beams and improve the transmission distance and focusing accuracy of the light beams.
[0033] A third converging lens 73 is provided on the projection light path between the integrator rod 4 and the first dichroic plate 31 .
[0034] By disposing the third converging lens 73 , light from the laser or other light source is focused onto the entrance end face of the integrator rod 4 , ensuring that more light can enter the integrator rod 4 and improving light utilization.
Claims
1. A high light efficiency laser light source projection system, characterized in that: The invention comprises a first laser (1) capable of emitting a blue light beam, a fluorescent wheel (2) being provided on an outgoing light path of the first laser (1), the fluorescent wheel (2) being provided with a fluorescent area (21) capable of being excited by the blue light beam to generate red, yellow and green light beams, and a transmission area (22) for the light beam emitted by the first laser (1) to pass through, a first dichroic plate (31) being provided on a projection light path between the first laser (1) and the fluorescent wheel (2) to transmit the light beam emitted by the first laser (1) and to reflect the light generated by the excitation of the fluorescent wheel (2), an integrator rod (4) being provided on a reflection light path of the first dichroic plate (31), and the projection system further comprising The invention comprises a second laser (5) capable of emitting a red light beam, wherein the wavelength of the red light beam emitted by the second laser (5) is greater than the wavelength of the red light beam excited by the fluorescent wheel (2), the second laser (5) is arranged opposite to the integrator rod (4), a reflection component (6) capable of reflecting the light beam passing through the fluorescent wheel (2) is provided on the transmission light path of the fluorescent wheel (2), a second dichroic plate (32) capable of reflecting the output light beam to the integrator rod (4) is provided on the output light path of the reflection component (6), and the first dichroic plate (31) and the second dichroic plate (32) are both arranged on the output light path of the second laser (5) and can allow the light beam emitted by the second laser (5) to transmit.
2. The high light efficiency laser light source projection system according to claim 1, characterized in that: The fluorescent area (21) comprises a fan-shaped red light area (211), a yellow light area (212), and a green light area (213); the central angle A of the red light area (211) ranges from 50° to 60°.
3. The high light efficiency laser light source projection system according to claim 1, characterized in that: The reflection assembly (6) comprises a first reflection mirror (61) arranged on the transmission light path of the fluorescent wheel (2), a second reflection mirror (62) is arranged on the reflection light path of the first reflection mirror (61), and the second dichroic plate (32) is arranged on the reflection light path of the second reflection mirror (62).
4. The high light efficiency laser light source projection system according to claim 3, characterized in that: A first converging lens (71) is provided on the projection light path between the fluorescent wheel (2) and the first reflector (61), and a second converging lens (72) is provided on the projection light path between the first reflector (61) and the second reflector (62).
5. The high light efficiency laser light source projection system according to claim 1, characterized in that: A first condensing lens group (81) is provided on the projection light path between the first laser (1) and the first dichroic plate (31), and a second condensing lens group (82) is provided on the projection light path between the second laser (5) and the second dichroic plate (32).
6. The high light efficiency laser light source projection system according to claim 1, characterized in that: A collimating lens group (9) is provided on the projection light path between the first dichroic plate (31) and the fluorescent wheel (2).
7. The high light efficiency laser light source projection system according to claim 1, characterized in that: A third converging lens (73) is provided on the projection light path between the integrator rod (4) and the first dichroic plate (31).