A modular high-efficiency heat dissipation uniform field laser light source system

Abstract

The invention discloses a modular high-efficiency heat dissipation uniform field laser light source system, comprising a blue laser light source Ⅰ1, a scattering plate Ⅰ2, an anti-blue and yellow beam combiner 3, an anti-red and blue-green beam combiner 4, a lens group Ⅰ5, a fluorescent unit 6, an RGB laser light source 7, a vibration scattering plate 8, a lens Ⅰ9, a lens group Ⅱ10, and a light pipe 11; a light beam emitted by the blue laser light source Ⅰ1 passes through the scattering plate Ⅰ2 and then enters the anti-blue and yellow beam combiner 3, and then enters the fluorescent unit 6 through the lens group Ⅰ5; a light beam generated after the fluorescent unit 6 is excited passes through the lens group Ⅰ5, the anti-blue and yellow beam combiner 3, the anti-red and blue-green beam combiner 4 and the lens group Ⅱ10 in sequence and enters the light pipe 11. The modular high-efficiency heat dissipation uniform field laser light source system can effectively dissipate the heat generated by the laser and obtain uniform picture projection output at the same time, and has good practical application value.

Description

Technical Field

[0001] The present invention relates to the field of laser projection technology, and in particular to a modular high-efficiency heat dissipation laser fluorescent light source (projection) system. Background Art

[0002] As the most advanced projection technology, laser projection has developed rapidly in recent years and has formed three main product forms, namely pure laser light source, laser fluorescent wheel and laser LED light source. Among them, the laser projector with fluorescent powder is the most cost-effective model. Laser fluorescent projection irradiates the fluorescent powder with blue laser to produce yellow light, which is combined with the wavelength of the blue laser of another part of the transmission light path, greatly reducing the coherence of the light source and effectively eliminating speckle. However, high lumen or long-term laser irradiation of the fluorescent wheel will make the local temperature of the fluorescent powder very high, resulting in a decrease in fluorescent efficiency, making it difficult to make a high-brightness projector. As a result, a laser fluorescent plus pure laser light source system was produced, which has the characteristics of laser fluorescent without speckle, and the high brightness, high definition and wide color gamut projection output characteristics of pure laser, which can truly reproduce the rich and gorgeous colors of the objective world.

[0003] In the pure laser light source used in projectors, the laser has very strong coherence and high monochromaticity, which will cause the speckle effect and unevenness of the laser projection image. At the same time, the power and wavelength of the laser will fluctuate due to changes in ambient temperature. The electro-optical conversion efficiency of a pure laser light source is generally only 13%~40%, and the rest of the electrical energy all generates heat, so the heat dissipation of the laser is particularly important. Traditional laser heat dissipation is to fix the laser on a heat sink and apply thermal grease between the laser and the heat sink. When using a high-power laser, it is difficult to control the laser temperature within the nominal operating temperature range.

[0004] The high coherence of semiconductor RGB laser diodes can cause speckle effects and non-uniformity in laser projection displays. At the same time, changes in operating temperature can affect the wavelength and power of the laser. Therefore, homogenization of the laser projection system and heat dissipation of the laser are particularly important. Summary of the invention

[0005] The present invention mainly solves the problems of laser heat dissipation and projection image non-uniformity, and proposes a modular high-efficiency heat dissipation uniform field laser light source system. By improving the laser heat dissipation structure and adding a vibration scattering plate structure to the laser optical path, the laser temperature can be controlled within the nominal operating temperature range, and a speckle-free and uniform projection image can be obtained.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] A modular high-efficiency heat dissipation uniform field laser light source system comprises a blue laser light source I, a scattering plate I, a blue-reflecting and yellow-transmitting beam combining mirror, a red-reflecting and blue-green-transmitting beam combining mirror, a lens group I, a fluorescent unit, an RGB laser light source, a vibration scattering plate, a lens I, a lens group II, and a light pipe.

[0008] The light beam emitted by the blue laser light source I passes through the scattering plate I and is incident on the blue-reflecting and yellow-transmitting beam combining mirror, and then passes through the lens group I and is incident on the fluorescent unit.

[0009] The light beam generated after the fluorescence unit is excited passes through lens group I, the blue-transmitting yellow beam combining mirror, the red-transmitting blue-green beam combining mirror and lens group II in sequence and is incident on the light pipe.

[0010] The light beams emitted by the RGB laser light source are incident on the light pipe through the vibration scattering plate, the lens, the red-reflecting and blue-green-transmitting beam combining mirror and the lens group II in sequence.

[0011] Preferably, the RGB laser light source includes a blue laser light source, a green laser light source, and a red laser light source, and the blue laser light source, the green laser light source, and the red laser light source are respectively welded to a water-cooled plate through indium-tin alloy solder sheets, and the light beam emitted by the blue laser light source is sequentially emitted through a reflector, an inverted green-transmitted blue beam combining mirror, an inverted red-transmitted blue-green beam combining mirror, and a lens; the light beam emitted by the green laser light source is sequentially emitted through an inverted green-transmitted blue beam combining mirror, an inverted red-transmitted blue-green beam combining mirror, and a lens; and the light beam emitted by the red laser light source is emitted through an inverted red-transmitted blue-green beam combining mirror and a lens.

[0012] The modular high-efficiency heat dissipation uniform field laser light source system described in the present invention adopts a laser fluorescent wheel plus a pure laser hybrid light source, which is coupled into a light pipe by wavelength beam combining, and a vibration scattering plate device is added to the pure laser light path to obtain a uniform picture projection output without speckles. At the same time, the heat dissipation structure of the laser is optimized, and the laser is welded to the heat dissipation plate through an indium tin alloy welding piece with a higher thermal conductivity. The thermal conductivity of the indium tin alloy is more than 5 times that of thermal conductive silicone grease, which can effectively dissipate the heat generated by the laser, control the temperature within the laser operating temperature range, and extend the life of the laser.

[0013] The present invention has the following advantages:

[0014] (1) The traditional heat dissipation method of applying thermal grease makes it difficult to control the temperature of a high-power laser within the operating temperature range. The thermal conductivity of indium tin alloy is more than 5 times that of thermal grease. Using indium tin alloy solder to weld the laser to the water cooling plate can more securely fix the laser to the water cooling plate and control the temperature within the nominal operating temperature range.

[0015] (2) Through the implementation of the solution of the present invention, a vibrating scattering plate device is added to the semiconductor RGB laser light path, and wavelength combination is performed with the fluorescent excitation light generated by the fluorescent unit, so that a uniform picture display without speckle can be achieved, greatly improving the viewing experience.

[0016] The invention has a reasonable design, designs a novel optical path using the beam combiner, couples and integrates semiconductor RGB laser diodes and laser fluorescent units, optimizes the heat dissipation structure of the laser, and adds a vibration scattering plate device in the RGB laser light path to realize a modular high-efficiency heat dissipation uniform field laser light source system. The modular high-efficiency heat dissipation uniform field laser light source system can effectively dissipate the heat generated by the laser and obtain a uniform screen projection output, and has good practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram showing the structure of a modular high-efficiency heat dissipation uniform field laser light source system.

[0018] Figure 2 Represents the RGB laser light source and heat dissipation structure.

[0019] Figure 3 Schematic diagram of the structure of the vibration scattering piece.

[0020] Figure 4 It represents the optical characteristics of the blue-reflecting and yellow-transmitting beam combiner.

[0021] In the figure: 1-blue laser light source Ⅰ, 2-scattering plate Ⅰ, 3-anti-blue and transparent yellow beam combiner, 4-anti-red and transparent blue-green beam combiner, 5-lens group Ⅰ, 6-fluorescent unit, 7-RGB laser light source, 8-vibration scattering plate, 9-lens Ⅰ, 10-lens group Ⅱ, 11-light pipe; 701-water cooling plate, 702-indium tin alloy welding piece, 703-blue laser light source, 704-green laser light source, 705-red laser light source, 706-reflector, 707-anti-green and transparent blue beam combiner, 708-anti-red and transparent blue-green beam combiner, 709-lens; 801-scattering plate support, 802-scattering plate, 803-vibration motor, 801-driver. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] A modular high-efficiency heat dissipation uniform field laser light source system, such as Figure 1 As shown, it includes a blue laser light source Ⅰ1, a scattering plate Ⅰ2, a blue-reflecting and yellow-transmitting beam combining mirror 3, a red-reflecting and blue-green-transmitting beam combining mirror 4, a lens group Ⅰ5, a fluorescent unit 6, an RGB laser light source 7, a vibrating scattering plate 8, a lens Ⅰ9, a lens group Ⅱ10, and a light pipe 11.

[0024] like Figure 1As shown, the light beam emitted by the blue laser light source Ⅰ1 passes through the scattering plate Ⅰ2 and is incident on the anti-blue and yellow beam combiner 3, and then passes through the lens group Ⅰ5 and is incident on the fluorescent unit 6. The light emitted by the blue laser light source 1 passes through the scattering plate Ⅰ2, transmits through the anti-blue and yellow beam combiner 3, and is focused to the fluorescent material of the fluorescent unit 6 by the lens group Ⅰ5.

[0025] The blue-reflecting and yellow-transmitting beam combiner 3 has an attached Figure 4 As shown in the light transmission characteristics, when incident on the blue-reflecting and yellow-transmitting beam combiner 3 at an angle of 45°, the average transmittance of the 440~530nm color light is less than 2%, and the average transmittance of the 540~680nm color light is greater than 95%.

[0026] like Figure 1 As shown, the light beam (yellow light) generated after the fluorescence unit 6 is excited passes through the lens group I5, the anti-blue and transparent yellow beam combiner 3, the anti-red and transparent blue and green beam combiner 4 and the lens group II10 in sequence and enters the light tube 11. The blue light source focused on the fluorescence unit 6 excites the fluorescent material to generate yellow light, which is emitted in parallel through the lens group 5 to the anti-blue and transparent yellow beam combiner 3 and transmitted to the anti-red and transparent blue and green beam combiner 4.

[0027] like Figure 1 As shown, the light beam emitted by the RGB laser light source 7 passes through the vibration scattering plate 8, lens I9, anti-red and blue-green beam combining mirror 4 and lens group II 10 in sequence and enters the light pipe 11. Then the light emitted by the RGB laser light source passes through the vibration scattering plate 8, transmits through the lens I9, and reaches the anti-red and blue-green beam combining mirror 4. The blue laser in the RGB laser light source is reflected by the beam combining mirror 4, and the red and green lasers are transmitted through the beam combining mirror 4 to the beam combining mirror 3, and are combined with the fluorescent excitation light generated by the fluorescent unit 6 by multi-wavelength, and the laser light source through the anti-red and blue-green beam combining mirror 4 enters the lens group II 10 in parallel for focusing coupling and enters the light pipe 11.

[0028] like Figure 2As shown, the RGB laser light source 7 dissipates heat through the following structure and emits to the vibration scattering plate, including a blue laser light source 703, a green laser light source 704, and a red laser light source 705. The blue laser light source 703, the green laser light source 704, and the red laser light source 705 are respectively welded to the water cooling plate 701 through the indium tin alloy welding piece 702. The light beam emitted by the blue laser light source 703 is sequentially emitted through the reflector 706, the anti-green and blue beam combining mirror 707, the anti-red and blue and green beam combining mirror 708, and the lens 709. The light beam emitted by the green laser light source 704 is sequentially emitted through the anti-green and blue beam combining mirror 707, the anti-red and blue and green beam combining mirror 708, and the lens 709. The light beam emitted by the red laser light source 705 is emitted through the anti-red and blue and green beam combining mirror 708 and the lens 709. Then, the RGB laser light sources are directly welded to the water cooling plate 701 through the indium tin alloy welding piece 702, and the water cooling plate water circuit is externally connected to a fan or a water cooling mechanism for cooling. The laser emitted by the blue laser source 703 is reflected by the reflector 706 to the anti-green-transmitting-blue beam combiner 707. The green laser source 704 is wavelength combined with the blue laser by the anti-green-transmitting-blue beam combiner 707. The red laser source 708 is multi-wavelength combined with the blue laser and the green laser by the anti-red-transmitting-blue-green beam combiner 708, and enters the lens 709 for convergence and emission.

[0029] like Figure 3 As shown, the vibration scattering sheet 8 includes a scattering sheet support 801 , on which a scattering sheet 802 and a vibration motor 803 are mounted, and the vibration motor 803 is externally connected to a driver 804 .

[0030] In specific implementation, the light beams transmitted or reflected by the beam combiner are incident at an angle of 45°. The wavelengths of semiconductor RGB laser diode light sources are 455nm, 465nm, 520nm, 525nm, 638nm, and 642nm respectively. Through a novel optical light path, a beam combiner is used to combine the multi-wavelength light sources, and a vibrating scattering device is added to the semiconductor RGB laser light path to obtain a uniform projection image without speckles, thereby realizing a high-brightness, high-cost-effective, speckle-free, and stable-performance laser light source system.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A modular high-efficiency heat dissipation uniform field laser light source system, characterized by: It comprises a blue laser light source I (1), a scattering plate I (2), a blue-reflecting and yellow-transmitting beam combining mirror (3), a red-reflecting and blue-green-transmitting beam combining mirror (4), a lens group I (5), a fluorescent unit (6), an RGB laser light source (7), a vibration scattering plate (8), a lens I (9), a lens group II (10), and a light pipe (11); The light beam emitted by the blue laser light source I (1) passes through the scattering plate I (2) and is incident on the blue-reflecting and yellow-transmitting beam combining mirror (3), and then passes through the lens group I (5) and is incident on the fluorescent unit (6); The yellow light generated by the fluorescent unit (6) after being excited is incident on the light pipe (11) through the lens group I (5), the blue-transmitting yellow beam combining mirror (3), the red-transmitting blue-green beam combining mirror (4) and the lens group II (10) in sequence; The light beam emitted by the RGB laser light source (7) passes through the vibrating scattering plate (8), lens I (9), the anti-red and transparent blue-green beam combining mirror (4) and lens group II (10) in sequence and is incident on the light pipe (11), wherein the red laser light in the RGB laser light source (7) is reflected by the anti-red and transparent blue-green beam combining mirror (4), the blue-green laser light is transmitted through the anti-red and transparent blue-green beam combining mirror (4) to be reflected by the anti-blue and transparent yellow beam combining mirror (3), and is incident on the light pipe (11) through the anti-red and transparent blue-green beam combining mirror (4) and lens group II (10).

2. A modular high-efficiency heat dissipation uniform field laser light source system according to claim 1, characterized in that: The RGB laser light source (7) comprises a blue laser light source (703), a green laser light source (704), and a red laser light source (705); the blue laser light source (703), the green laser light source (704), and the red laser light source (705) are respectively welded to a water-cooled plate (701) via an indium-tin alloy welding sheet (702); a light beam emitted by the blue laser light source (703) is sequentially emitted through a reflector (706), a green-transmitting blue beam combining mirror (707), a red-transmitting blue-green beam combining mirror (708), and a lens (709); a light beam emitted by the green laser light source (704) is sequentially emitted through a green-transmitting blue beam combining mirror (707), a red-transmitting blue-green beam combining mirror (708), and a lens (709); and a light beam emitted by the red laser light source (705) is emitted through a red-transmitting blue-green beam combining mirror (708) and a lens (709).

3. A modular high-efficiency heat dissipation uniform field laser light source system according to claim 1 or 2, characterized in that: The vibration scattering plate (8) comprises a scattering plate support (801), a scattering plate (802) and a vibration motor (803) are mounted on the scattering plate support (801), and the vibration motor (803) is externally connected to a driver (804).

4. A modular high-efficiency heat dissipation uniform field laser light source system according to claim 3, characterized in that: The light beams transmitted or reflected by the blue-reflecting and yellow-transmitting beam combining mirror (3) and the red-reflecting and blue-green-transmitting beam combining mirror (4) are incident at an angle of 45°.

5. A modular high-efficiency heat dissipation uniform field laser light source system according to claim 4, characterized in that: The light transmission characteristic of the blue-reflecting and yellow-transmitting beam combining mirror (3) is that when incident on the blue-reflecting and yellow-transmitting beam combining mirror (3) at an angle of 45°, the average transmittance of 440-530nm color light is less than 2%, and the average transmittance of 540-680nm color light is greater than 95%.

Images