Light source structure for converting blue laser into white light

Abstract

The utility model discloses a light source structure capable of converting blue laser into white light, which comprises a shell, openings are arranged at the upper end and the lower end of the shell, an upper mounting cavity position is arranged in the upper port of the shell in a downward extending manner, a lower mounting cavity position is arranged in the lower port of the shell in an upward extending manner, and a light emitting through hole is arranged between the upper mounting cavity position and the lower mounting cavity position; the light spot dodging sheet, the light spot shaping cylindrical mirror and the blue light laser are fixedly arranged in the lower mounting position from top to bottom; the fluorescent sheet, the stray light diaphragm sheet and the light spot condensing lens are fixedly arranged in the upper mounting position from bottom to top. A light outlet of the blue light laser, the light spot shaping cylindrical mirror, the light spot dodging sheet, the light outlet through hole, the fluorescent sheet, the stray light diaphragm sheet and the light spot condensing lens are arranged along the central axis of the shell. According to the scheme, the light spot emitting efficiency and the light spot stability of the blue laser are improved, a high-quality blue laser beam can be obtained, conversion of light energy of the fluorescent sheet into white light energy is increased, stray light is filtered through the stray light diaphragm sheet, and converted high-quality white light is output.

Description

Technical Field

[0001] The utility model relates to the technical field of laser lighting, in particular to a light source structure for converting blue laser into white light. Background Art

[0002] Energy conservation is one of the directions of the technological progress of modern lighting. From the early incandescent lamps to fluorescent lighting technologies, and then to the development of LED lighting technologies until the current laser lighting technologies, energy-saving lighting technologies have been continuously evolving. LED lighting can save 50%-70% of electricity compared with incandescent lamps and fluorescent lamps, while laser lighting technology can save 50%-80% of electricity compared with LED lighting technology. After the launch of white light lasers, Shuji Nakamura (the inventor of white light LEDs), a Nobel laureate, once predicted that the lighting solution of converting monochromatic laser into white light using fluorescent functional materials will become a new generation of lighting technology in the future and replace LED lighting. Considering the existing technology and cost, most white light laser lamps on the market currently choose blue laser as the emission light source. The blue laser passes through a transparent substrate, and in the phosphor conversion layer, part of it is converted into yellow light and mixed with the remaining unconverted blue light to form white light. Existing laser lighting lamps for converting blue laser into white light sources, although they are relatively mature lighting lamps in terms of technology, usually still have problems such as poor heat dissipation of the lamps, laser speckle, and more fluorescent stray light generated during the conversion of white laser. Summary of the Utility Model

[0003] The purpose of the embodiments of the present utility model is to provide a light source structure for converting blue laser into white light to solve the technical problems of heat dissipation, laser speckle, and more stray light of the existing light source structure for converting blue laser into white light.

[0004] To achieve the above purpose, the technical solution adopted by the present utility model is: to provide a light source structure for converting blue laser into white light, including:

[0005] A housing, both the upper and lower ends of the housing are open. An upper installation cavity is extended downward inside the upper port of the housing, and a lower installation cavity is extended upward inside the lower port of the housing. There is a light output through-hole between the upper installation cavity and the lower installation cavity;

[0006] A spot homogenizing sheet, a spot shaping cylindrical lens, and a blue laser are fixedly arranged from top to bottom in the lower installation position;

[0007] A phosphor sheet, a stray light diaphragm, and a spot condensing lens are fixedly arranged from bottom to top in the upper installation position;

[0008] Wherein, the light output port of the blue laser, the spot shaping cylindrical lens, the spot homogenizing sheet, the light output through-hole, the phosphor sheet, the stray light diaphragm, and the spot condensing lens are arranged along the central axis of the housing.

[0009] Furthermore, the housing is made of a metal material. The upper mounting cavity includes a first stepped hole position, a second stepped hole position, and a third stepped hole position that are concentric with the light-emitting through hole and have gradually increasing hole diameters. The first stepped hole position is embedded with a fluorescent sheet, the second stepped hole position is embedded with a stray light diaphragm sheet, and the third stepped hole position is embedded with a spot condensing lens.

[0010] Preferably, the spot shaping cylindrical lens is a cylindrical lens, horizontally arranged under the spot homogenizing sheet. The laser beam of the blue laser enters from one arc surface of the spot shaping cylindrical lens and exits from the other arc surface to the spot homogenizing sheet.

[0011] Preferably, a fixing bracket is provided for mounting the spot shaping cylindrical lens and the spot homogenizing sheet. The fixing bracket includes a top surface and side walls vertically extending downward along the edge of the top surface. A lower cavity penetrating up and down is provided at the center position of the top surface. The lower cavity is used for mounting the spot shaping cylindrical lens, and an upper cavity forming a groove position with the top surface is provided around the lower cavity. The upper cavity is used for mounting the spot homogenizing sheet.

[0012] Optionally, first symmetric through hole positions are provided on the top surface of the lower cavity at its front and rear end positions. The first symmetric through hole positions communicate with the lower cavity. On both sides adjacent to the first symmetric through hole positions of the upper cavity, there are two side wing groove positions, and second symmetric through hole positions are provided on the two side wing groove positions.

[0013] Furthermore, the lower mounting cavity includes a fourth stepped hole position, a fifth stepped hole position, a sixth stepped hole position, and a seventh stepped hole position that are concentric with the light-emitting through hole and have gradually increasing hole diameters. The fixing bracket is embedded in the fourth stepped hole position.

[0014] Furthermore, the blue laser includes a copper base, a laser chip, a metal cap, and electrode pins. The upper edge of the metal cap abuts against the lower port formed by the side wall of the fixing bracket. The copper base is press-fitted into the sixth stepped hole position, and an annular heat dissipation cavity is formed between the sixth stepped hole position and the outer wall of the metal cap.

[0015] Preferably, the side wall of the copper base is provided with heat dissipation grooves, which are arranged vertically and conduct the annular heat dissipation cavity to the bottom of the copper base.

[0016] Optionally, a laser driver wiring protection circuit board is provided at the bottom of the copper base, and the laser driver wiring protection circuit board is fixed in the seventh stepped hole position.

[0017] The beneficial effects of a light source structure for converting blue laser to white light disclosed in this application are as follows:

[0018] 1. By arranging a spot shaping cylindrical lens and a spot homogenizing sheet above the beam projection of the blue laser disposed within the housing, the elliptical spot is shaped into a circular square spot with a small divergence angle, which is conducive to increasing the emission spot efficiency and spot stability of the blue laser, enabling the acquisition of a high-quality blue laser beam and increasing the conversion of the light energy of the fluorescent sheet into white light energy.

[0019] 2. A stray light diaphragm sheet is arranged above the fluorescent sheet. The high-quality blue laser beam irradiates the fluorescent sheet, and the fluorescent material in the fluorescent sheet excites white light and other stray light under the bombardment of the blue laser. The white light and the fluorescent stray light are filtered by the stray light diaphragm sheet to obtain high-quality white light, which is then emitted through a spot condensing lens, facilitating the improvement of the white light effect of the light source output of the blue laser converted into white light.

[0020] 3. The housing is made of a metal material with good thermal conductivity. The copper base of the blue laser is in interference connection with the housing to conduct heat to the housing for dissipation. In addition, an annular heat dissipation cavity is formed between the outer wall of the metal tube cap of the blue laser and the inside of the housing, and is connected through a heat dissipation groove provided on the side wall of the copper base, which is conducive to enhancing the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic exploded view of the overall structure of the present utility model.

[0022] Figure 2 It is a schematic sectional view of the housing structure of the present utility model.

[0023] Figure 3 It is a schematic sectional view of the overall assembly structure of the present utility model.

[0024] Figure 4 It is a schematic simplified optical path diagram of the present utility model.

[0025] Figure 5 It is a schematic three-dimensional view of the overall assembly structure of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall also fall within the scope of protection of the present disclosure.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should also be noted that the orientation terms such as left, right, up, and down in the embodiments of the present application are only relative concepts to each other or are referenced based on the normal use state of the product, and should not be considered restrictive.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0030] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout.

[0031] Please refer to Figures 1 to 5 , a light source structure for converting blue laser into white light provided by the present technical solution, which includes:

[0032] A housing 1, both the upper and lower ends of the housing 1 are open. An upper installation cavity is extended downward inside the upper port of the housing 1, and a lower installation cavity is extended upward inside the lower port of the housing 1. An optical output through hole 10 is provided between the upper installation cavity and the lower installation cavity;

[0033] A spot homogenizing filter 2, a spot shaping cylindrical lens 3, and a blue laser 4 fixedly arranged in the lower installation position from top to bottom;

[0034] A fluorescent sheet 6, a stray light diaphragm 7, and a spot condensing lens 8 fixedly arranged in the upper installation position from bottom to top;

[0035] Among them, the light output port of the blue laser 4, the spot shaping cylindrical lens 3, the spot homogenizing filter 2, the optical output through hole 10, the fluorescent sheet 6, the stray light diaphragm 7, and the spot condensing lens 8 are arranged along the central axis of the housing.

[0036] In the light source structure of the present solution, by arranging the spot shaping cylindrical lens 3 and the spot homogenizing filter 2 above the light beam projected by the blue laser 4 in the housing 1, the laser elliptical spot is shaped into a circular square small divergence angle spot, which is beneficial to increasing the emission spot efficiency and spot stability of the blue laser 4, obtaining a high-quality blue laser beam, and increasing the energy conversion of the fluorescent sheet 6 from light energy to white light energy.

[0037] A stray light diaphragm 7 is arranged above the fluorescent sheet 6. A high-quality blue laser beam irradiates the fluorescent sheet 6. The fluorescent material in the fluorescent sheet 6 is excited to emit white light and other stray light under the bombardment of the blue laser. The white light and the fluorescent stray light are filtered by the stray light diaphragm 7 to obtain high-quality white light, and then are emitted through the spot condenser lens 8, which is beneficial to improving the white light effect of the light source output of the blue laser converted to white light.

[0038] Furthermore, the housing 1 is made of a heat-conductive metal material, preferably made of aluminum alloy, which has good heat conductivity, light weight, and relatively low cost compared to copper alloy.

[0039] Refer to Figure 2 、 Figure 3 Furthermore, the upper mounting cavity position includes a first stepped hole position 101, a second stepped hole position 102, and a third stepped hole position 103 that are concentric with the light-emitting through hole 10 and have gradually increasing apertures. The first stepped hole position 101 is embedded with the fluorescent sheet 6, the second stepped hole position 102 is embedded with the stray light diaphragm 7, and the third stepped hole position 103 is embedded with the spot condenser lens 8. The structural design of the upper mounting cavity position facilitates the installation of the above-mentioned fluorescent sheet 6, stray light diaphragm 7, and spot condenser lens 8. The above-mentioned optical components are adhesively bonded and fixedly connected to the corresponding stepped hole positions.

[0040] Refer to Figure 1 、 Figure 4 Preferably, the spot shaping cylindrical lens 3 is a cylindrical lens, horizontally arranged below the spot homogenizing sheet 2. The laser beam of the blue laser 4 enters from one arc surface of the spot shaping cylindrical lens 3 and exits from the other arc surface to the spot homogenizing sheet 2.

[0041] Refer to Figure 1 Preferably, a fixing bracket 5 is provided for mounting the spot shaping cylindrical lens 3 and the spot homogenizing sheet 2. The fixing bracket 5 includes a top surface and side walls vertically extending downward along the edge of the top surface. A lower cavity 501 penetrating up and down is provided at the center position of the top surface. The lower cavity 501 is used for mounting the spot shaping cylindrical lens 3, and an upper cavity 502 forming a groove position with the top surface is provided outside the lower cavity 501. The upper cavity 502 is used for mounting the spot homogenizing sheet 2.

[0042] Refer to Figure 1 、 Figure 3, further, on the top surface of the lower cavity 501 along its front and rear end positions, there is a first symmetric through-hole position 503, and the first symmetric through-hole position 503 is communicated with the lower cavity 501. On both sides of the upper cavity 502 adjacent to the first symmetric through-hole position 503, there are two side-wing groove positions 504, and on the two side-wing groove positions 504, there is a second symmetric through-hole position 505. Through the design of the first symmetric through-hole position 503, the two side-wing groove positions 504 and the second symmetric through-hole position 505, it is convenient to fixedly mount the bracket 5 for automatically positioning and identifying and assembling the spot shaping cylindrical lens 3 and the spot homogenizing sheet 2. At the same time, the first symmetric through-hole position 503 and the second symmetric through-hole position 505 are also beneficial to heat dissipation, and the heat at the upper end of the blue laser 4 is output from the first symmetric through-hole position 503 and the second symmetric through-hole position 505.

[0043] Refer to Figure 2 , Figure 3 , further, the lower mounting cavity position includes a fourth stepped hole position 104, a fifth stepped hole position 105, a sixth stepped hole position 106, and a seventh stepped hole position 107 that are concentric with the light-emitting through-hole 10 and have gradually increasing hole diameters, and the fixing bracket 5 is embedded in the fourth stepped hole position 104.

[0044] Refer to Figures 1 to 3 , further, the blue laser 4 includes a copper base 401, a laser chip 402, a metal tube cap 403, and electrode pins 404. The upper edge of the metal tube cap 403 abuts against the lower port formed by the side wall of the fixing bracket 5, and the copper base 401 is interference-fitted to the sixth stepped hole position 106, and an annular heat dissipation cavity is formed between the fifth stepped hole position 105 and the outer wall of the metal tube cap 403.

[0045] Preferably, the side wall of the copper base 401 is provided with heat dissipation grooves 4011, and the heat dissipation grooves 4011 are arranged vertically, conducting the annular heat dissipation cavity and the bottom of the copper base 401, which is beneficial to improving the heat dissipation effect.

[0046] Preferably, the bottom of the copper base 401 is provided with a laser driver wiring protection circuit board 9, and the laser driver wiring protection circuit board 9 is fixed to the seventh stepped hole position. Fixing the laser driver wiring protection circuit board 9 at the bottom of the blue laser 4 is convenient for connecting the electrode pins 404 of the blue laser 4 to the laser driver wiring protection circuit board 9, and a copper-plated through-hole plug-in connection is adopted.

[0047] The embodiments of the present disclosure have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to technologies in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A light source structure for converting blue laser into white light, characterized in that: include: A shell (1), wherein the upper and lower ends of the shell (1) are both open, an upper mounting cavity is provided in the upper end of the shell (1) and extends downward, a lower mounting cavity is provided in the lower end of the shell (1) and extends upward, and a light emitting through hole (10) is provided between the upper mounting cavity and the lower mounting cavity; A light spot homogenizing sheet (2), a light spot shaping cylindrical mirror (3), and a blue light laser (4) are fixedly arranged in the lower mounting position from top to bottom; A fluorescent sheet (6), a stray light aperture sheet (7), and a light spot focusing lens (8) are fixedly arranged in the upper mounting position from bottom to top; The light outlet of the blue laser (4), the light spot shaping cylindrical mirror (3), the light spot homogenizing sheet (2), the light outlet through hole (10), the fluorescent sheet (6), the stray light aperture sheet (7), and the light spot focusing lens (8) are arranged along the central axis of the shell.

2. The light source structure for converting blue laser into white light according to claim 1, characterized in that: The housing (1) is made of a heat-conductive metal material, and the upper mounting cavity comprises a first step hole (101), a second step hole (102), and a third step hole (103) which form a coaxial axis with the light-emitting through hole (10) and whose aperture increases step by step; the first step hole (101) is embedded with a fluorescent sheet (6), the second step hole (102) is embedded with a stray light aperture sheet (7), and the third step hole (103) is embedded with a spot focusing lens (8).

3. The light source structure for converting blue laser to white light according to claim 1, characterized in that: The light spot shaping cylindrical mirror (3) adopts a cylindrical lens and is horizontally arranged below the light spot homogenizing plate (2). The laser beam of the blue laser (4) enters from the circular arc surface on one side of the light spot shaping cylindrical mirror (3) and is emitted from the circular arc surface on the other side to the light spot homogenizing plate (2).

4. The light source structure for converting blue laser into white light according to claim 3, characterized in that: A fixed bracket (5) is provided for mounting the light spot shaping cylindrical mirror (3) and the light spot homogenizing sheet (2); the fixed bracket (5) comprises a top surface and a side wall extending vertically downward along the edge of the top surface; a lower cavity (501) penetrating from top to bottom is provided at the center of the top surface; the lower cavity (501) is used for mounting the light spot shaping cylindrical mirror (3); an upper cavity (502) is provided at the periphery of the lower cavity (501) to form a groove with the top surface; the upper cavity (502) is used for mounting the light spot homogenizing sheet (2).

5. The light source structure for converting blue laser into white light according to claim 4, characterized in that: The lower cavity (501) is provided with a first symmetrical through hole position (503) on the top surface along the front and rear ends thereof, and the first symmetrical through hole position (503) is connected to the lower cavity (501); the upper cavity (502) is provided with two side wing groove positions (504) on two sides adjacent to the first symmetrical through hole position (503), and the two side wing groove positions (504) are provided with second symmetrical through hole positions (505).

6. The light source structure for converting blue laser into white light according to claim 4, characterized in that: The lower mounting cavity comprises a fourth step hole position (104), a fifth step hole position (105), a sixth step hole position (106), and a seventh step hole position (107) which form a coaxial axis with the light emitting through hole (10) and whose apertures gradually increase in size, and the fixing bracket (5) is embedded in the fourth step hole position (104).

7. The light source structure for converting blue laser into white light according to claim 6, characterized in that: The blue laser (4) comprises a copper base (401), a laser chip (402), a metal tube cap (403) and an electrode pin (404); the upper edge of the metal tube cap (403) abuts against a lower port formed by a side wall of a fixed bracket (5); the copper base (401) is interference-connected to the sixth step hole position (106); and the fifth step hole position (105) and the outer wall of the metal tube cap (403) form an annular heat dissipation cavity.

8. The light source structure for converting blue laser into white light according to claim 7, characterized in that: The side wall of the copper base (401) is provided with a heat dissipation groove (4011), which is arranged vertically and connects the annular heat dissipation cavity with the bottom of the copper base (401).

9. The light source structure for converting blue laser into white light according to claim 7, characterized in that: A laser drive wiring protection circuit board (9) is provided at the bottom of the copper base (401), and the laser drive wiring protection circuit board (9) is fixed at the seventh step hole.

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