Remote excitation fluorescent glass type white light LD

Abstract

The utility model discloses a remote excitation fluorescent glass type white light LD, which solves the problems of high-temperature carbonization of a traditional fluorescent material and design of the shape of fluorescent glass to prevent leakage of excited blue light by using a remote excitation packaging mode. Comprising a heat dissipation piece, a blue-light LD is fixed on the heat dissipation piece, a cylindrical heat conduction piece covering a tube cap of the blue-light LD is fixed on the blue-light LD, fluorescent glass is matched with internal threads at the upper end of the heat conduction piece, a cylindrical fixing piece covering the heat conduction piece is further included, and a hollow condensing lens with an opening in the lower end is fixed at the upper end of the fixing piece. The condensing lens is connected with the fixing piece through a mortise and tenon joint structure. And the round cap type fluorescent glass with external threads is in threaded connection with the heat conducting piece of the round cap type fluorescent glass. And the blue light LD transmits the waste heat to the heat dissipation device. The device has the advantages of simple heat dissipation structure, low blue light transmission, high luminous efficiency and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of solid-state lighting and display, in particular to a remotely excited fluorescent glass type white light LD. Background Art

[0002] Traditional white light LEDs use a blue light LED chip to excite the "fluorescent powder + resin" solution to obtain white light. That is, yellow fluorescent powder and resin are mixed and coated on the LED chip. However, this solution is easily affected by the waste heat of white light LEDs, resulting in resin aging, device chromaticity drift, and even dead light. At the same time, the size of the light-emitting surface of the LED chip increases with the increase of power, and it is very easy to have a sudden drop in efficiency. For this reason, laser diode (LD) excitation sources and remote excitation new fluorescent glass have been applied. Blue light LD as an excitation source to excite fluorescent glass lighting and display devices have shown great development potential. However, this solution faces two serious problems. One is that the unabsorbed blue laser is very easy to emit from the device; the other is the heat dissipation and packaging problems of the device.

[0003] Chinese patent CN110906281A discloses a transmission laser lighting device based on rod-shaped fluorescent materials. A hole with a depth of 1.0 mm to 5.0 mm is opened in the end face direction of the reflective layer. The rod-shaped fluorescent material corresponds to the position of the hole and has the same diameter to perform fluorescence conversion. Chinese patent CN217903679U proposes a heat dissipation device for remotely exciting green light ceramics with a single laser diode, but the patent mainly uses ceramics, metals, and laser diodes for integrated heat dissipation. The structural design and heat transfer efficiency of the laser diode heat sink are not considered. In addition, literature reports on the use of blue lasers as excitation sources in the field of lighting and display have not paid attention to the leakage problem of blue lasers. Blue lasers can stimulate brain nerves and cause sleep problems.

[0004] In summary, the current problems of blue light leakage, heat dissipation and packaging of remote excitation fluorescent glass type white light LD devices have not been systematically solved. This problem seriously restricts the industrialization process of LD devices. The structural design of fluorescent glass for laser lighting and display is of great significance to promote the development of devices. Utility Model Content

[0005] The utility model aims to provide a remote excitation fluorescent glass type white light LD, which utilizes the remote excitation packaging mode to solve the problem of high temperature carbonization of traditional fluorescent materials and designs the shape of fluorescent glass to prevent the leakage of excited blue light.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The technical solution of the utility model is implemented as follows: a remotely excited fluorescent glass type white light LD, including a heat sink, a blue light LD is fixed on the heat sink, a tubular heat-conducting member with a cap covering the blue light LD is fixed on the blue light LD, the upper end of the heat-conducting member has an internal thread with fluorescent glass, and also includes a tubular fixing member covering the heat-conducting member, and a focusing lens with an open lower end and hollow is fixed on the upper end of the fixing member.

[0008] Furthermore, the heat sink is composed of a cylinder and a plurality of heat dissipation thorns arranged around the cylinder.

[0009] Furthermore, a circular groove is opened at the center of the upper end of the heat sink, and the blue light LD is fixed in the groove by fixing glue. The lower part of the groove is connected with a through groove that passes downward through the heat sink and can place the blue light LD pin. The fixing part is placed in the circular groove and the outer circular surface of the fixing placed in the circular groove is close to the inner circular surface of the circular groove.

[0010] Furthermore, the focusing lens and the fixing member are connected via a mortise and tenon structure.

[0011] Furthermore, the fixing member and the heat dissipation member are connected by welding or the fixing member and the heat conduction member are connected by threaded fitting.

[0012] Furthermore, the fluorescent glass is a round cap type with external threads, the heat conducting component is provided with an inner hole with internal threads, and the fluorescent glass and the heat conducting component are threadedly connected.

[0013] Furthermore, the heat conducting member and the tube holder of the blue light LD are connected via a fixing glue or the heat conducting member and the tube cap of the blue light LD are connected via a threaded fit.

[0014] Furthermore, the upper portion of the inner hole of the fixing member is in a trumpet shape that opens outwards.

[0015] Furthermore, the fluorescent glass is cylindrical at the lower end and round cap-shaped at the upper end, the surface roughness of the fluorescent glass round cap is 12.5 μm-50 μm, and the ratio of the height value to the luminescent center ion concentration is 1 mm~1.5 mm:0.1 mol.

[0016] Furthermore, the material of the fluorescent glass (3) is calcium silicate glass, and the luminescent center ion is Cr 3+ 、Ce 3+ At least 1 of the following.

[0017] Beneficial effects of the utility model:

[0018] (1) The round-cap-shaped fluorescent glass with external threads can fully absorb the blue light emitted by the LD and convert it into yellow-red light. The round-cap-shaped structure can effectively prevent the leakage of blue laser light and increase the uniformity of light emission.

[0019] (2) A spherical focusing lens is set outside the fluorescent glass to focus the light mixed by the LD and the fluorescent glass and emit high-quality white light.

[0020] (3) The blue light LD transfers waste heat to the heat sink. The outer side of the blue light LD heat sink is designed to have a cactus thorn-like shape, which effectively increases the heat dissipation area and efficiency.

[0021] (4) The remote excitation integrated white light LD designed in the utility model has the advantages of high luminous quality, extremely low blue light emission, and simple heat dissipation method.

[0022] (5) The focusing lens and the fixing part are connected by a mortise and tenon structure, which has the following beneficial effects: ① easy installation and disassembly; ② firm connection, and the white light beam will not be emitted from the connection; ③ easy to manufacture.

[0023] (6) A circular groove is opened at the upper end of the heat sink. The blue light LD is placed in the circular groove and the outer cylindrical surface of the blue light LD tube base contacts the heat sink. The heat sink, heat conductor and fixing parts are all made of materials with good heat dissipation performance, such as copper or aluminum alloy. Placing the blue light LD in the circular groove increases the contact area and improves the heat dissipation efficiency.

[0024] (7) The fluorescent glass thread is matched in the heat conductor, which not only makes it easy to fix and prevent light leakage, but also increases the contact area for more convenient heat transfer; the heat conductor and the cap of the blue light LD are fixed by threads. The fixing part and the heat conductor are fixed by threads, and the three threaded fixing structures not only increase the heat conduction area, but also facilitate installation and disassembly. The heat conductor contacts the cap of the blue light LD to achieve heat conduction, and then the heat conductor transfers the heat to the fixing part. The fixing part can not only dissipate heat, but also transfer part of the heat to the heat sink to achieve rapid heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the expanded structure of the utility model;

[0027] Figure 2 It is the front view of the utility model;

[0028] Figure 3 for Figure 2 A sectional view taken along the AA axis.

[0029] Figure 4It is a three-dimensional diagram of the utility model;

[0030] In the figure, 1. focusing lens, 2. fixing part, 3. fluorescent glass, 4. heat conducting part, 5. blue light LD, 6. heat dissipating part, 7. heat dissipating thorns, 8. groove, and 9. through groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] A remotely excited fluorescent glass type white light LD includes a heat sink 6, on which a blue light LD5 is fixed, on which a cylindrical heat conductor 4 with a cap covering the blue light LD5 is fixed, the upper end of the heat conductor 4 is internally threaded with a fluorescent glass 3, and also includes a cylindrical fixing member 2 covering the heat conductor 4, and the upper end of the fixing member 2 is fixed with a focusing lens 1 with an open lower end and hollow.

[0033] The heat sink 6 is composed of a cylinder and a plurality of heat sink thorns 7 arranged around the cylinder.

[0034] A circular groove 8 is opened at the center of the upper end of the heat sink 6, and the blue light LD5 is fixed in the groove 8 by fixing glue. The lower part of the groove 8 is connected with a through groove 9 which passes through the heat sink 6 downward and can hold the pin of the blue light LD5. The fixing part 2 is partially placed in the circular groove 8 and the outer circular surface of the fixing part 2 placed in the circular groove 8 is close to the inner circular surface of the circular groove 8.

[0035] The focusing lens 1 and the fixing member 2 are connected via a mortise and tenon structure.

[0036] The fixing member 2 and the heat sink 6 are connected by welding or the fixing member 2 and the heat conducting member 4 are connected by threading.

[0037] The fluorescent glass 3 is a round cap with external threads, the heat conducting member 4 is provided with an inner hole with internal threads, and the fluorescent glass 3 and the heat conducting member 4 are threadedly connected.

[0038] The heat conducting member 4 and the tube base of the blue light LD5 are connected via fixing glue or the heat conducting member 4 and the tube cap of the blue light LD5 are threadedly connected.

[0039] The upper portion of the inner hole of the fixing member 2 is in the shape of a trumpet that opens outwards, and the upper portion of the focusing lens 1 is in the shape of a hollow round hat.

[0040] The fluorescent glass 3 is cylindrical at the lower end and round cap-shaped at the upper end. The surface roughness of the round cap of the fluorescent glass 3 is 12.5 μm-50 μm, and the ratio of the height value to the luminescent center ion concentration is 1 mm~1.5 mm:0.1 mol.

[0041] Fluorescent glass 3 is made of calcium silicate glass, and the luminescent center ion is Cr 3+ 、Ce 3+ At least 1 of the following.

[0042] Embodiment 1: A remote excitation fluorescent glass type white light LD, the focusing lens 1 is connected to the fixing part 2; the fluorescent glass 3 with external threads and round cap structure is connected to the heat conductor 4 by threads; the blue light LD 5 transfers the waste heat to the blue light LD heat sink 6. The external threads of the fluorescent glass are connected to the heat conductor 4 and transfer the waste heat to the heat conductor. The round cap structure of the fluorescent glass 3 relies on the surface roughness and height to diverge and reabsorb the unabsorbed excitation source blue light. The fluorescent glass 3 is made of calcium silicate glass, and the luminescent center ion is Cr 3+ 、Ce 3+ . The surface roughness of the round cap of fluorescent glass 3 is 12.5 μm, and the ratio of the height value to the ion concentration of the luminescent center is 1.5 mm:0.1 mol. The light emitted by fluorescent glass 3 passes through the condenser to emit high-quality white light. The corresponding blue light emission rate is 5%. The round cap of fluorescent glass 3 absorbs the unabsorbed blue light for a second time and converts it into yellow-red light, and white light is obtained after mixing. The condenser lens focuses the light emitted by the fluorescent glass and emits a high-quality white light beam.

[0043] Example 2: A remote excitation fluorescent glass type white light LD, the focusing lens 1 is connected to the fixing part 2; the fluorescent glass 3 with external threads and round cap structure is connected to the heat conductor 4 by threads; the blue light LD 5 transfers the waste heat to the blue light LD heat sink 6. The external threads of the fluorescent glass are connected to the heat conductor and transfer the waste heat to the heat conductor. The round cap structure of the fluorescent glass relies on the surface roughness and height to diverge and reabsorb the unabsorbed excitation source blue light. The fluorescent glass is made of calcium silicate glass, and the luminescent center ion is Cr 3+ 、Ce 3+ The surface roughness of the fluorescent glass round cap is 50 μm, and the ratio of the height value to the ion concentration of the luminescent center is 1 mm:0.1 mol. The light emitted by the fluorescent glass passes through the condenser to emit high-quality white light. The corresponding blue light emission rate is 10%.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A remotely excited fluorescent glass type white light LD, comprising a heat sink (6), characterized in that: The heat sink (6) is fixed with a blue light LD (5), and the blue light LD (5) is fixed with a cylindrical heat-conducting member (4) with a cap covering the blue light LD (5), the upper end of the heat-conducting member (4) is internally threaded with a fluorescent glass (3), and further comprises a cylindrical fixing member (2) covering the heat-conducting member (4), and the upper end of the fixing member (2) is fixed with a hollow focusing lens (1) with an open lower end.

2. The remote excitation fluorescent glass type white light LD according to claim 1, characterized in that: The heat sink (6) is composed of a cylinder and a plurality of heat sink thorns (7) arranged around the cylinder.

3. The remote excitation fluorescent glass type white light LD according to claim 1, characterized in that: A circular groove (8) is formed at the center of the upper end of the heat sink (6), and the blue light LD (5) is fixed in the groove (8) by means of a fixing glue. The lower part of the groove (8) is connected to a through groove (9) which passes through the heat sink (6) downward and can accommodate the pin of the blue light LD (5). The fixing member (2) is partially placed in the circular groove (8), and the outer circular surface of the fixing member (2) placed in the circular groove (8) is tightly attached to the inner circular surface of the circular groove (8).

4. The remote excitation fluorescent glass type white light LD according to claim 1, characterized in that: The focusing lens (1) and the fixing member (2) are connected via a mortise and tenon structure.

5. The remote excitation fluorescent glass type white light LD according to claim 3, characterized in that: The fixing member (2) and the heat dissipation member (6) are connected by welding, or the fixing member (2) and the heat conduction member (4) are connected by threaded fitting.

6. The remote excitation fluorescent glass type white light LD according to claim 1, characterized in that: The fluorescent glass (3) is a round cap-shaped piece with external threads, the heat conducting piece (4) is provided with an inner hole with internal threads, and the fluorescent glass (3) and the heat conducting piece (4) are threadedly connected.

7. The remote excitation fluorescent glass type white light LD according to claim 1, characterized in that: The heat conducting member (4) and the tube base of the blue light LD (5) are connected via a fixing glue or the heat conducting member (4) and the tube cap of the blue light LD (5) are connected via a threaded fit.

8. The remote excitation fluorescent glass type white light LD according to claim 5, characterized in that: The upper portion of the inner hole of the fixing member (2) is in the shape of a trumpet that opens outwards, and the upper portion of the focusing lens (1) is in the shape of a hollow round hat.

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