Laser light source device

Abstract

The present invention discloses a laser light source device, which comprises a laser source, a collimating lens, a focusing lens, a scattering sheet, an aperture, a fluorescent device and a transparent optical medium arranged in sequence along the propagation direction of light; the laser source comprises at least one laser diode for emitting a parallel laser beam; the aperture is arranged at the center of a reflector, and the aperture is used to transmit the laser beam and block the fluorescent and reflected laser beam; the laser beam emitted by the laser source is collimated by the collimating lens, focused by the focusing lens and scattered by the scattering sheet, and then irradiated to the aperture, and then transmitted through the aperture to reach the fluorescent device, and irradiated to the inner concave surface of the reflector through the fluorescent effect of the fluorescent device, and outputted through the transparent optical medium after being reflected by the inner concave surface, thereby generating output light. The present invention improves the optical power density while achieving less blocking of the fluorescence by the optical path, thereby improving the overall efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of laser lighting, and in particular to a laser light source device. Background Art

[0002] At present, the use of blue laser to pump fluorescent materials to obtain white light, yellow light, green light and red light has become the mainstream technology of laser lighting due to its high cost performance and high reliability.

[0003] Generally, a reflective pump optical path can achieve a higher optical power density than a transmissive pump optical path.

[0004] Figure 1 It is an existing reflective pump optical path. However, this optical path has a large shielding effect on the fluorescence and a large light loss. The fluorescent material and the blue laser are on the same side, and the heat is concentrated, which is not conducive to heat dissipation. At the same time, as a blue laser with a large heat output, its heat generating part is located on one side of the central axis of the optical path, which is not conducive to the overall heat dissipation design.

[0005] Therefore, how to provide a method to reduce the shielding of fluorescence by the optical path and improve the utilization rate of laser has become a technical problem to be solved urgently in this field. Summary of the invention

[0006] The object of the present invention is to provide a laser light source device, which can improve the light power density while achieving less shielding of fluorescence by the light path, thereby improving the overall efficiency.

[0007] To achieve the above object, the present invention provides a laser light source device, which includes a laser source, a collimating lens, a focusing lens, a scattering sheet, an aperture, a fluorescent device and a transparent optical medium arranged in sequence along the propagation direction of light;

[0008] The laser source comprises at least one laser diode for emitting a parallel laser beam;

[0009] The aperture is arranged at the center of a reflector, and is used to transmit the laser beam and block the fluorescent light and the reflected laser beam;

[0010] The laser beam emitted by the laser source is collimated by the collimating lens, focused by the focusing lens and scattered by the scattering sheet, and then irradiated to the aperture, and then transmitted through the aperture to reach the fluorescent device, and irradiated to the concave surface of the reflector through the fluorescent effect of the fluorescent device, and then output through the transparent optical medium after being reflected by the concave surface, thereby generating output light.

[0011] Optionally, the laser source includes a plurality of blue laser diodes, and the plurality of laser light beams emitted by the plurality of blue laser diodes are shaped into parallel laser light beams which are parallel to each other and the spacing between adjacent light beams is within a preset spacing range.

[0012] Optionally, the center of the aperture is on the same straight line as the focus of the focusing lens, and the outer contour size of the aperture is larger than the radial size of the laser beam after passing through the focusing lens and then through the scattering sheet.

[0013] Optionally, the reflector has an opening and an inner concave surface, the opening faces forward in the propagation direction of the laser beam, and the inner concave surface is provided with a reflective coating.

[0014] Optionally, the size of the reflector and the curvature of the inner concave surface determine the angle of the generated output light.

[0015] Optionally, the device further comprises a lens disposed in front of the light path of the transparent optical medium, and the size of the lens and the distance between the lens and the transparent optical medium are adjusted to obtain parallel light or light with an angle; the lens is a concave mirror and / or a convex lens.

[0016] Optionally, the transparent optical medium is used to transmit visible light of 400nm to 700nm, the material of the transparent optical medium is optical crystal, optical glass, optical ceramic or optical plastic, and the transparent optical medium is a flat plate or a concave lens.

[0017] Optionally, the fluorescent device includes a reflective layer and a fluorescent layer, the reflective layer is arranged between the fluorescent layer and the transparent optical medium, and the reflective layer and the fluorescent layer are the same in shape and size.

[0018] Optionally, the reflective layer is a reflective film or a reflective metal layer;

[0019] The reflective film is plated on the surface of the transparent optical medium, and the reflective film is an aluminum film, a silver film or a dielectric layer;

[0020] The reflective metal layer is glued or welded on the surface of the transparent optical medium, and the reflective metal layer is high-reflectivity metal aluminum.

[0021] Optionally, a metal copper layer, copper wire or heat pipe is further arranged between the fluorescent device and the transparent optical medium; the metal copper layer is glued to the surface of the transparent optical medium or the metal copper layer is embedded in the transparent optical medium; the copper wire or the heat pipe is glued or welded to the surface of the transparent optical medium.

[0022] According to the specific embodiment provided by the present invention, the present invention discloses the following technical effects: the pump optical path formed by the laser light source device provided by the present invention has a laser source, a collimating lens, a focusing lens, a scattering sheet, an aperture, a fluorescent device and a transparent optical medium in sequence along the propagation direction of light, making the optical path more compact, thus reducing the volume of the device. In addition, the present invention avoids blocking the fluorescence on the optical path, thereby improving the optical power density and the efficiency of the overall device. In addition, the present invention separates the heat dissipation of the laser light source from the heat dissipation of the fluorescent device, thereby reducing the heat density, thus improving the heat dissipation efficiency and extending the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural diagram of a reflective pump optical path in the prior art;

[0025] Figure 2 A structural diagram of a laser light source device provided in Example 1 of the present invention;

[0026] Figure 3 A structural diagram of Example A of the structural relationship between the fluorescent device and the transparent optical medium in the present invention;

[0027] Figure 4 It is a structural diagram of a first embodiment of Example B of the structural relationship between the fluorescent device and the transparent optical medium in the present invention;

[0028] Figure 5 It is a structural diagram of a second embodiment of Example B of the structural relationship between the fluorescent device and the transparent optical medium in the present invention;

[0029] Figure 6 It is a front view of Example C of the structural relationship between the fluorescent device and the transparent optical medium in the present invention;

[0030] Figure 7 for Figure 6 A top view of a first embodiment of the present invention;

[0031] Figure 8 for Figure 6 A top view of a second embodiment of the present invention;

[0032] Fig. 9 A schematic diagram of a laser light source device provided in Example 1 of the present invention in which the emitted light is focused light;

[0033] Fig.10 A schematic diagram of a laser light source device provided in Example 1 of the present invention in which the emitted light is parallel light;

[0034] Fig.11 A schematic diagram of the laser light source device provided in Embodiment 1 of the present invention, in which the emitted light is light with an angle;

[0035] Fig.12 A structural diagram of a laser light source device provided in Example 2 of the present invention;

[0036] Fig.13 A structural diagram of a laser light source device provided in Example 3 of the present invention;

[0037] Fig.14 This is a structural diagram of the laser light source device provided in Example 4 of the present invention. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1

[0041] like Figure 2 As shown, the laser light source device provided in this embodiment 1 includes a laser source 1, a collimating lens 2, a focusing lens 3, a scattering sheet 4, an aperture 5, a fluorescent device 7 and a transparent optical medium 8 which are sequentially arranged along the propagation direction of light. The laser beam emitted by the laser source 1 is collimated by the collimating lens 2, focused by the focusing lens 3 and scattered by the scattering sheet 4, and then irradiates to the aperture 5, and then transmits through the aperture 5 to reach the fluorescent device 7, and irradiates to the inner concave surface of the reflector 6 through the fluorescent effect of the fluorescent device 7, and is output through the transparent optical medium 8 after being reflected and scattered by the inner concave surface, thereby generating output light.

[0042] Figure 1 The size ranges of the parts are:

[0043] D1: Φ2-30mm; D2: Φ10-200mm; D3: Φ12-220mm; D4: Φ1-10mm;

[0044] d:Φ30-450mm;

[0045] The relationship between the dimensions is: 0.4<D1 / d<0.8; D2 / D1>5; D3 / D4>12

[0046] The distance between the collimating lens 2 and the focusing lens 3 can be freely adjusted according to the needs of designing the device, and the scattering plate 4 is located before the focus of the focusing lens 3. Generally, the closer the scattering plate 4 is to the focus, the higher the pump intensity at the focus, and the higher the optical power density can be obtained. The appropriate position of the scattering plate 4 can be selected according to needs.

[0047] Wherein, the laser source 1 comprises at least one laser diode for emitting a parallel laser beam;

[0048] In various embodiments of the present invention, the laser source 1 may be a single blue laser diode or a plurality of blue laser diodes. When there are a plurality of blue laser diodes, the plurality of laser beams emitted by the plurality of blue laser diodes are shaped into parallel laser beams which are parallel to each other and the spacing between adjacent beams is within a preset spacing range. The preset spacing range may be as small as possible.

[0049] The aperture 5 is arranged at the center of a reflector 6, and is used to transmit the laser beam and block the fluorescent and reflected laser beams. In various embodiments of the present invention, the aperture 5 is used to allow the blue laser to pass through, while trying to prevent the fluorescent and reflected blue laser from passing through the aperture 5. Since the blue laser passes through the aperture 5 in a converged state after passing through the focusing lens 3, it is required that the center of the aperture 5 and the focus of the focusing lens 3 are on the same straight line, and the outer contour size of the aperture 5 is larger than the radial size of the laser beam after passing through the focusing lens 3 and then through the scattering sheet 4. The shape of the aperture 5 can be, but is not limited to, square or circular.

[0050] The reflector 6 has an opening and an inner concave surface, the opening faces forward in the propagation direction of the laser beam, and the inner concave surface is provided with a reflective coating. The material of the reflector 6 is a transparent medium or metal, and a reflective coating with a high reflectivity, such as an aluminum film or a silver film, needs to be plated on the transparent medium or the metal. The transparent medium can be an optical crystal, optical glass, optical ceramics, and optical plastic. The inner concave surface of the reflector 6 can be a spherical surface, a parabolic surface, an ellipsoidal surface, a free-form surface, etc., and a suitable surface shape can be selected according to the application requirements.

[0051] The transparent optical medium 8 is used to transmit visible light of 400nm to 700nm, and the transmittance after coating is above 98%. The transparent optical medium can transmit light on one hand, and can dissipate heat for the fluorescent material on the other hand, and provide suitable mechanical strength for the fluorescent device 7 to adhere to the surface. The material of the transparent optical medium 8 is optical crystal, optical glass, optical ceramic or optical plastic, and transparent optical media with good thermal conductivity, such as sapphire, are preferably selected. The transparent optical medium 8 is a flat plate or a concave lens.

[0052] The fluorescent device 7 includes a reflective layer 71 and a fluorescent layer 72. The reflective layer 71 is disposed between the fluorescent layer 72 and the transparent optical medium 8. The reflective layer 71 and the fluorescent layer 72 have the same shape and size. Figure 3 .

[0053] Example A: Figure 3 As shown, in this example A, the reflective layer 71 is a reflective film, which is plated on the surface of the transparent optical medium 8, and the reflective film is an aluminum film, a silver film or a dielectric layer;

[0054] The reflective layer 71 in this example A can also be a reflective metal layer, which is glued or welded to the surface of the transparent optical medium 8, and the reflective metal layer is high-reflectivity metal aluminum.

[0055] Both the reflective film and the reflective metal layer reflect the fluorescence, so that the reflected light is irradiated onto the inner concave surface of the reflector 6 .

[0056] Implementation method 1 of Example B: Figure 4 As shown, the difference between Example B and Example A is that a metal copper layer 73 is further provided between the fluorescent device 7 and the transparent optical medium 8. The metal copper layer 73 has the same shape and size as the fluorescent layer 72, and the metal copper layer is glued or welded to the surface of the transparent optical medium, and the reflective layer 71 is glued to the surface of the metal copper layer 73, so that the fluorescent device 7 can dissipate heat better, and the fluorescent film can withstand higher power density.

[0057] Implementation method 2 of Example B: Figure 5 As shown, the difference between the second embodiment and the first embodiment of the above example B is that the metal copper layer 73 is embedded in the transparent optical medium. This arrangement not only enables the fluorescent film to have a better heat dissipation effect, but also reduces the shielding of the output light.

[0058] Example C: Figure 6 As shown, the difference between Example C and Example B is that a copper wire or heat pipe 74 is arranged between the fluorescent device 7 and the transparent optical medium 8; the metal copper layer is glued to the surface of the transparent optical medium or the metal copper layer; the copper wire or heat pipe 74 is glued or welded to the surface of the transparent optical medium. When the heat generated by the fluorescent device 7 is large and cannot be dissipated through the transparent optical medium in time, the heat needs to be quickly transferred from the center of the transparent medium to the edge through the copper wire or heat pipe. Figure 7 As shown, the shape of the copper wire or heat pipe 74 is from one edge of the transparent optical medium to the other edge, and the center passes through the device 7. Figure 8As shown, the shape of the copper wire or heat pipe 74 can be from the edge to the center of the transparent optical medium. When the heat generated by the fluorescent material is particularly large, multiple copper wires or multiple heat pipes are required to conduct the heat from the center to the edge of the lens medium. This example allows the fluorescent film to obtain a better heat dissipation effect, so that the fluorescent film can have a higher light conversion efficiency when it is continuously irradiated by the excitation light. However, in this example C, the size of the copper wire or heat pipe 74 should be selected according to the size of the heat generated. When the heat generated is large, the size and number of the copper wire and the heat pipe will also be correspondingly larger, otherwise the fluorescent material will be burned because the heat cannot be discharged in time. It cannot be too large, otherwise it will cover too much and occupy too much area of ​​the transparent optical medium, and block the outgoing light due to the large area, resulting in the loss of the outgoing light.

[0059] In this embodiment 1, the angle of the generated output light can be adjusted by changing the size of the reflector and the curvature of the inner concave surface, such as Figure 9-11 As shown, focused light, parallel light and light with a certain angle can be obtained respectively.

[0060] Example 2: Fig.12 As shown, different from other embodiments, the laser light source device may further include a lens 9 disposed in front of the optical path of the transparent optical medium. Since the reflector 6 is used to control the angle of the emitted light, the size and curvature of the reflector 6 are required to be high, so parallel light or light with an angle can be obtained by adjusting the size of the lens 9 and the distance between the lens 9 and the transparent optical medium 8.

[0061] Example 3: Fig.13 As shown, the difference from Example 2 is that the transparent optical medium 8 used is a concave lens.

[0062] Example 4: Fig.14 As shown, the difference from Example 2 is that the lens 9 is a concave mirror and a convex lens. In the application scenario where a larger light spot is required, a concave mirror and a convex lens are installed at a suitable distance from the laser light source to obtain parallel light with a larger light spot.

[0063] Various embodiments of the present invention may be applied to devices requiring laser illumination.

[0064] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A laser light source device, characterized in that: The device comprises a laser source, a collimating lens, a focusing lens, a scattering sheet, an aperture, a fluorescent device and a transparent optical medium which are sequentially arranged along the propagation direction of light; The laser source comprises at least one laser diode for emitting a parallel laser beam; The aperture is arranged at the center of a reflector, and is used to transmit the laser beam and block the fluorescent light and the reflected laser beam; The fluorescent device is laid on the surface of the transparent optical medium, glued or welded on the surface of the transparent optical medium, or embedded in the transparent optical medium; The transparent optical medium is a concave lens; The laser beam emitted by the laser source is collimated by the collimating lens, focused by the focusing lens and scattered by the scattering sheet, and then irradiated to the aperture, and then transmitted through the aperture to reach the fluorescent device, and irradiated to the concave surface of the reflector through the fluorescent effect of the fluorescent device, and then output through the transparent optical medium after being reflected by the concave surface, thereby generating output light.

2. The laser light source device according to claim 1, characterized in that: The laser source comprises a plurality of blue laser diodes, and the plurality of laser beams emitted by the plurality of blue laser diodes are shaped into parallel laser beams which are parallel to each other and the interval between adjacent beams is within a preset interval range.

3. The laser light source device according to claim 1, characterized in that: The center of the aperture is in the same straight line as the focus of the focusing lens, and the outer contour size of the aperture is larger than the radial size of the laser beam after passing through the focusing lens and then the scattering sheet.

4. The laser light source device according to claim 1, characterized in that: The reflector has an opening and an inner concave surface, wherein the opening faces forward in the propagation direction of the laser beam, and the inner concave surface is provided with a reflective coating.

5. The laser light source device according to claim 1 or 4, characterized in that: The size of the reflector and the curvature of the inner concave surface determine the angle of the generated output light.

6. The laser light source device according to claim 1, characterized in that: The device also includes a lens arranged in front of the light path of the transparent optical medium, and the size of the lens and the distance between the lens and the transparent optical medium are adjusted to obtain parallel light or light with an angle; the lens is a concave mirror and / or a convex lens.

7. The laser light source device according to claim 1, characterized in that: The transparent optical medium is used for transmitting visible light of 400nm to 700nm, and the material of the transparent optical medium is optical crystal, optical glass, optical ceramic or optical plastic.

8. The laser light source device according to claim 1, characterized in that: The fluorescent device comprises a reflective layer and a fluorescent layer. The reflective layer is arranged between the fluorescent layer and the transparent optical medium. The reflective layer and the fluorescent layer have the same shape and size.

9. The laser light source device according to claim 8, characterized in that: The reflective layer is a reflective film or a reflective metal layer; The reflective film is plated on the surface of the transparent optical medium, and the reflective film is an aluminum film, a silver film or a dielectric layer; The reflective metal layer is glued or welded on the surface of the transparent optical medium, and the reflective metal layer is high-reflectivity metal aluminum.

10. The laser light source device according to claim 1, 8 or 9, characterized in that: A metal copper layer, copper wire or heat pipe is also arranged between the fluorescent device and the transparent optical medium; the metal copper layer is glued to the surface of the transparent optical medium or the metal copper layer is embedded in the transparent optical medium; the copper wire or the heat pipe is glued or welded to the surface of the transparent optical medium.

Images