Surface-mounted laser fluorescent light source device

Abstract

The invention provides a surface-mounted laser fluorescent light source device. The surface-mounted laser fluorescent light source device comprises a heat sink, a shell, fluorescent ceramic, a heat-conducting reflecting layer, a laser unit and an electrode plate, the heat sink is arranged at the bottom of the shell; the fluorescent ceramic is arranged in the center of the upper surface of the heat sink, and the heat conduction reflecting layer is arranged between the fluorescent ceramic and the heat sink; the plurality of laser units are arranged on the upper surface of the heat sink in a manner of surrounding and facing the fluorescent ceramic at equal intervals; one electrode plate is arranged in an area of the heat sink between every two laser units; the electrode plate is electrically connected with the adjacent laser unit and penetrates downwards from the upper surface of the heat sink to the lower surface of the heat sink, and a patch end for supplying power to the laser unit is formed on the lower surface of the heat sink, so that a high-brightness patch type laser fluorescent light source device scheme is provided.

Description

Technical Field

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

[0002] At present, light source devices based on laser irradiation of phosphors are widely used. Their general structure is that a blue laser irradiates the phosphor from the back, and the laser passes through the phosphor to excite the phosphor to emit light. When a higher light brightness is required, the energy of the excitation light source is generally increased by increasing the number of lasers in the light source device, thereby increasing the brightness of the phosphor. However, this transmission structure is not conducive to the heat dissipation of the phosphor. When the energy of the excitation blue laser is increased, the accumulated heat can easily cause the phosphor to overheat and burst.

[0003] Therefore, it is necessary to provide a technical solution for a light source device with small optical extension, small volume, high brightness, which is conducive to the heat dissipation of the phosphor and is not prone to overheating and bursting of the phosphor. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a patch-type laser fluorescent light source device, comprising a heat sink, a housing, fluorescent ceramics, a heat-conducting reflective layer, a laser unit, and an electrode sheet; The heat sink is arranged at the bottom of the housing; The fluorescent ceramic is arranged at the center of the upper surface of the heat sink, and the heat conductive reflective layer is arranged between the two; A plurality of the laser units are arranged on the upper surface of the heat sink at equal intervals and surrounding the fluorescent ceramic. An electrode sheet is disposed in the heat sink region between every two laser units; The electrode sheet is electrically connected to the adjacent laser unit and passes through from the upper surface of the heat sink to the lower surface of the heat sink, forming a patch end on the lower surface of the heat sink for supplying power to the laser unit.

[0005] In a possible implementation, the device further includes a cover glass; The cover glass is arranged on the top of the housing to form a device closed space with the housing; The inner surface of the cover glass is provided with a plurality of reflective films having the same number as the number of the laser units; The reflective film is located in a region where the reflected laser light is emitted toward the inner surface of the cover glass after the laser unit emits laser light toward the fluorescent ceramic.

[0006] In a possible implementation manner, a first anti-reflection film is disposed on other regions of the inner surface of the cover glass where the reflective film is not disposed.

[0007] In a possible implementation manner, a second anti-reflection film is disposed on the outer surface of the cover glass.

[0008] In a possible implementation manner, a third anti-reflection film is disposed on the material surface of the fluorescent ceramic.

[0009] In a possible implementation, the heat conductive reflective layer is any one of a reflective aluminum sheet, an aluminum-plated layer, and a silver-plated layer.

[0010] In a possible implementation manner, the laser unit and the electrode sheet are electrically connected via a gold wire.

[0011] In a possible implementation, the number of the laser units is an even number; The adjacent sides of two adjacent laser units are connected to the same electrode sheet.

[0012] In a possible implementation, the laser unit includes a laser, a support, and a power supply electrode; The laser is arranged on the heat sink through the support; The laser is electrically connected to the electrode sheet on one side thereof through one power supply electrode on each side.

[0013] In a possible implementation, the laser is a vertical cavity surface emitting laser.

[0014] The technical solution provided by the present invention has at least the following beneficial effects: By setting a thermal conductive reflective layer between the fluorescent ceramic and the heat sink, a portion of the laser light that passes through the fluorescent ceramic can be reflected upwards back to the fluorescent ceramic, thereby improving the laser utilization rate and thus improving the brightness of the light source device. At the same time, by setting a thermal conductive reflective layer, it is also easier to dissipate the heat generated by the fluorescent ceramic from the bottom heat sink, making it possible for the fluorescent ceramic to withstand higher laser power. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a top view of a surface-mount laser fluorescent light source device provided in an embodiment of the present invention; Figure 2 The embodiment of the present invention provides Figure 1 Schematic diagram of the first cross-sectional structure in the AA direction; Figure 3 A schematic diagram of the cover glass structure in a bottom view provided by an embodiment of the present invention; Figure 4 The embodiment of the present invention provides Figure 1 Schematic diagram of the second cross-sectional structure in the AA direction; Figure 5A schematic diagram of a cross-sectional structure of an electrode sheet provided in an embodiment of the present invention; In the accompanying drawings, 11, heat sink; 12, housing; 13, fluorescent ceramic; 14, thermal conductive reflective layer; 15, laser unit; 16, electrode sheet; 17, cover glass; 18, reflective film; 19, first anti-reflection film; 20, second anti-reflection film; 21, gold wire; 151, laser; 152, support; 153, power electrode. DETAILED DESCRIPTION

[0016] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0017] Please refer to Figures 1 to 5 The present invention provides a patch-type laser fluorescent light source device, comprising a heat sink 11, a housing 12, a fluorescent ceramic 13, a thermal conductive reflective layer 14, a laser unit 15, and an electrode sheet 16; The heat sink 11 is arranged at the bottom of the housing 12; The fluorescent ceramic 13 is arranged at the center of the upper surface of the heat sink 11, and the heat conductive reflective layer 14 is arranged between the two; A plurality of the laser units 15 are arranged on the upper surface of the heat sink 11 at equal intervals and surround the fluorescent ceramic 13; An electrode sheet 16 is disposed in the area of ​​the heat sink 11 between every two laser units 15; The electrode sheet 16 is electrically connected to the adjacent laser unit 15 , and passes from the upper surface of the heat sink 11 to the lower surface of the heat sink 11 , forming a patch terminal on the bottom outer surface of the housing 12 for powering the laser unit 15 .

[0018] In this embodiment, the heat sink 11 is used to achieve bottom heat dissipation, and a conventional heat-conducting material with relatively good heat dissipation performance can be used, such as copper material. The heat sink 11 can be directly integrated with the shell 12, which is more conducive to heat dissipation, or the shell 12 is only wrapped around, and the heat sink 11 is directly used as the bottom. When using this patch-type laser fluorescent light source device, the heat sink 11 at the bottom is generally directly soldered to other heat dissipation devices, such as fin heat sinks, heat pipe heat sinks, etc. When the heat sink 11 is made of copper material, an insulating layer needs to be set between the heat sink 11 and the electrode sheet 16. The shell 12 adopts a conventional design. The fluorescent ceramic 13 can adopt a conventional design, or a scattering factor can be injected into it to increase its scattering characteristics. The injected scattering factor can be bubbles, cavities, particles, etc. After the fluorescent ceramic 13 increases the scattering characteristics, the light emitted by the laser unit 15 can be reflected multiple times inside the fluorescent ceramic 13, increasing the optical path of the light in contact with the fluorescent material and improving the fluorescence performance. The heat-conducting reflective layer 14 is used to transfer the heat of the fluorescent ceramic 13 to the heat sink 11, and is also used to reflect part of the light emitted by the laser unit 15 that passes through the fluorescent ceramic 13 upward back to the fluorescent ceramic 13. Specifically, it can be achieved by using a highly reflective aluminum sheet or by plating aluminum or silver on the bottom of the fluorescent ceramic 13. The laser unit 15 is implemented based on a conventional laser, and can be implemented using a conventional blue light semiconductor laser. The power can be 5W, and the angle between the laser it emits and the fluorescent ceramic 13 can be set to 30° or 45°. The electrode sheet 16 is a conventional patch design. In specific implementation, the electrode sheet 16 can be attached to the circuit board through the patch end, and the circuit board supplies power to the laser unit 15. The number of laser units 15 can be set to 4, which are arranged opposite to each other in pairs, and are respectively arranged in the four directions of the top, bottom, left and right of the fluorescent ceramic 13.

[0019] In a possible implementation, it further includes a cover glass 17; The cover glass 17 is disposed on the top of the housing 12 to form a device closed space with the housing 12; The inner surface of the cover glass 17 is provided with a number of reflective films 18 which is the same as the number of the laser units 15; The reflective film 18 is located in a region where the reflected laser light is emitted toward the inner surface of the cover glass 17 after the laser unit 15 emits laser light toward the fluorescent ceramic 13 .

[0020] In this embodiment, the cover glass 17 is made of conventional materials. The reflective film 18 is made of conventional reflective materials and can be set to an elliptical shape. Figure 1 The oval in the dotted line portion can be understood as the reflective film 18 disposed on the lower surface of the cover glass 17 . Figure 3What is shown is the cover glass 17 at an upward viewing angle, and an elliptical reflective film 18 is provided on its lower surface. In a specific implementation, after the laser unit 15 emits laser light to the fluorescent ceramic 13, part of the laser light will be reflected by the fluorescent ceramic 13, and the reflected light will hit the area of ​​the reflective film 18 and further reflect to the housing 12. The housing 12 can absorb the reflected light, and the generated heat can be transferred to the heat sink 11 at the bottom, so as to prevent part of the laser light reflected by the fluorescent ceramic 13 from passing through the cover glass 17 to form stray light and affect the luminous color of the device. It should be noted that the area size of the reflective film 18 needs to be determined according to parameters such as the angle of the laser unit 15 toward the fluorescent ceramic 13 and the divergence angle of the reflected light on the surface of the fluorescent ceramic 13.

[0021] In one possible implementation, Figure 4 A first anti-reflection film 19 is disposed on other areas of the inner surface of the cover glass 17 where the reflective film 18 is not disposed.

[0022] In a possible implementation, a second anti-reflection film 20 is disposed on the outer surface of the cover glass 17 .

[0023] In this embodiment, the first anti-reflection film 19 and the second anti-reflection film 20 are both conventional anti-reflection films, and specifically, a film material with an anti-reflection effect of 99.5% can be used. Since one surface of the cover glass 17 itself has a reflectivity of about 4%, and its upper and lower surfaces have a total reflectivity of about 8%, by coating the first anti-reflection film 19 and the second anti-reflection film 20 respectively, the transmittance of the cover glass 17 can be effectively improved, and the light brightness of the patch-type laser fluorescent light source device can be improved.

[0024] In a possible implementation, a third anti-reflection film is disposed on the material surface of the fluorescent ceramic 13 .

[0025] In this embodiment, the third anti-reflection film is a conventional anti-reflection film. After the anti-reflection film is coated on the surface of the fluorescent ceramic 13 , more light can enter the interior of the fluorescent ceramic 13 , thereby increasing the luminous brightness of the fluorescent ceramic 13 .

[0026] In a possible implementation, the heat-conductive reflective layer 14 is any one of a reflective aluminum sheet, an aluminum-plated layer, and a silver-plated layer.

[0027] In this embodiment, it is assumed that the light emitted by the laser unit 15 is blue light, and the fluorescent ceramic 13 generates yellow light after absorbing the blue light, and the blue light and the yellow light are superimposed to generate white light. When multiple laser units 15 simultaneously emit lasers to the fluorescent ceramic 13, the fluorescent ceramic 13 itself will also generate heat due to the absorption of a certain amount of light energy. By attaching a reflective aluminum sheet to the bottom of the fluorescent ceramic 13, or plating a layer of aluminum to obtain an aluminum-plated layer, or plating a layer of silver to obtain a silver-plated layer, the heat dissipation performance of the fluorescent ceramic 13 can be effectively improved to prevent it from bursting due to excessive temperature. The reflective aluminum sheet can be a highly reflective aluminum sheet, which can not only dissipate heat from the heat sink 11 at the bottom, but also reflect part of the blue light that passes through the fluorescent ceramic 13 upward back to the fluorescent ceramic 13, thereby improving the utilization rate of the blue light, thereby further improving the luminous brightness of the patch-type laser fluorescent light source device.

[0028] In a possible implementation, the laser unit 15 and the electrode sheet 16 are electrically connected via a gold wire 21 .

[0029] In this embodiment, the gold wire 21 can be a conventional type, such as a μm-level gold wire. In specific implementation, the laser unit 15 and the electrode sheet 16 can be connected through multiple gold wires 21. For example, several gold wires 21 can be arranged in a row to connect the laser unit 15 and the electrode sheet 16 respectively, so as to improve the stability of the connection between the laser unit 15 and the electrode sheet 16, and also help to reduce the corresponding resistance and improve the utilization rate of electric energy.

[0030] In a possible implementation, the number of the laser units 15 is an even number; The adjacent sides of two adjacent laser units 15 are connected to the same electrode sheet 16 .

[0031] In this embodiment, the number of laser units 15 is set to an even number, which can ensure that the adjacent sides of two adjacent laser units 15 use the same electrode, so that they are directly connected to the same electrode sheet 16, simplifying the internal circuit connection.

[0032] In a possible implementation, the laser unit 15 includes a laser 151, a support 152, and a power supply electrode 153; The laser 151 is disposed on the heat sink 11 through the support 152; The laser 151 is electrically connected to the electrode sheet 16 on one side thereof through the power supply electrodes 153 on both sides.

[0033] In this embodiment, the laser 151 can adopt a blue light semiconductor laser. The support 152 adopts a conventional design. Several μm-level gold wires can be used to achieve electrical connection between the laser 151 and the power electrode 153. The power electrode 153 can be divided into an anode electrode and a cathode electrode. The power electrodes 153 on the adjacent side between two adjacent lasers 151 have the same polarity. In a specific embodiment, the number of laser units 15 is 4, that is, 4 lasers 151, which are respectively located in the four directions of up, down, left and right of the fluorescent ceramic 13, and the four lasers 151 simultaneously emit lasers obliquely downward to the fluorescent ceramic 13. Under the irradiation of multiple lasers 151, the fluorescent ceramic 13 can receive more light energy and have higher brightness.

[0034] In a possible implementation, the laser 151 is a vertical cavity surface emitting laser.

[0035] In this embodiment, the laser 151 uses a vertical cavity surface emitting laser (VCSEL), which can effectively control the size of the patch laser fluorescent light source device, and the radius of the spot can be controlled within 1mm, so that the present invention has the characteristics of small optical extension and high brightness, and helps to reduce the size of the optical system to which the present invention is applied and improve energy utilization. In a specific embodiment, the heat sink 11 and the housing 12 in the patch laser fluorescent light source device are both square in the horizontal plane. The overall size of the patch laser fluorescent light source device can be set to 8mm in length, 8mm in width, and 5mm in height.

[0036] It should be noted that the drawings in this application are mainly used to more clearly show the connection relationship between the components, and the specific proportions and sizes between the components are not used to limit the present technical solution.

[0037] The above embodiments should not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent conversion shall fall within the protection scope of the present invention.

Claims

1. A patch type laser fluorescent light source device, characterized in that: Including heat sink, shell, fluorescent ceramic, thermal conductive reflective layer, laser unit, electrode sheet; The heat sink is arranged at the bottom of the housing; The fluorescent ceramic is arranged at the center of the upper surface of the heat sink, and the heat conductive reflective layer is arranged between the two; A plurality of the laser units are arranged on the upper surface of the heat sink at equal intervals and surrounding the fluorescent ceramic. An electrode sheet is disposed in the heat sink region between every two laser units; The electrode sheet is electrically connected to the adjacent laser unit and passes through from the upper surface of the heat sink to the lower surface of the heat sink, forming a patch end on the lower surface of the heat sink for supplying power to the laser unit.

2. The SMD laser fluorescent light source device according to claim 1, characterized in that: Also includes cover glass; The cover glass is arranged on the top of the housing to form a device closed space with the housing; The inner surface of the cover glass is provided with a plurality of reflective films having the same number as the number of the laser units; The reflective film is located in a region where the reflected laser light is emitted toward the inner surface of the cover glass after the laser unit emits laser light toward the fluorescent ceramic.

3. The SMD laser fluorescent light source device according to claim 2, characterized in that: A first anti-reflection film is disposed on other areas of the inner surface of the cover glass where the reflective film is not disposed.

4. The SMD laser fluorescent light source device according to claim 3, characterized in that: The outer surface of the cover glass is provided with a second anti-reflection film.

5. The SMD laser fluorescent light source device according to claim 1, characterized in that: A third anti-reflection film is arranged on the material surface of the fluorescent ceramic.

6. The SMD laser fluorescent light source device according to claim 1, characterized in that: The heat-conducting reflective layer is any one of a reflective aluminum sheet, an aluminum-plated layer, and a silver-plated layer.

7. The SMD laser fluorescent light source device according to claim 1, characterized in that: The laser unit and the electrode sheet are electrically connected via a gold wire.

8. The SMD laser fluorescent light source device according to claim 1, characterized in that: The number of the laser units is an even number; The adjacent sides of two adjacent laser units are connected to the same electrode sheet.

9. The SMD laser fluorescent light source device according to claim 8, characterized in that: The laser unit includes a laser, a support, and a power supply electrode; The laser is arranged on the heat sink through the support; The laser is electrically connected to the electrode sheet on one side thereof through one power supply electrode on each side.

10. The SMD laser fluorescent light source device according to claim 9, characterized in that: The laser is a vertical cavity surface emitting laser.

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