Device and method for solving problem of collimation of output beam of LD / led for illumination

Abstract

A device and method for solving the problem of the collimation of an output beam of an LD / LED for illumination, the device comprising an LD / LED, which is configured to output ultraviolet light or blue light; a lens group, which comprises a total internal reflection spherical lens and a GRIN lens and is configured to collimate an output beam of the LD / LED; and a spot analyzer, which is configured to analyze spots of the beam output by the LD / LED by means of the lens group. The present invention further relates to the method for solving the problem of the collimation of an output beam of an LD / LED for illumination. By using the device and method for solving the problem of the collimation of an output beam of an LD / LED for illumination, a total internal reflection spherical lens and a GRIN lens are added into the device; and by means of adjusting the heights of and the working distance between the total internal reflection spherical lens and the GRIN lens, the collimation of an output beam of an LD / LED is realized. A beam is collimated and shaped by means of the device, thus reducing the output light loss of the LD / LED, and improving the lighting effect and thermal stability of an LD / LED illumination light source. The device has a compact structure, rapidly and easily collimates and shapes the beam, and has a good collimation effect.

Description

A device and method for solving the problem of LD / LED output beam collimation for lighting Technical Field

[0001] The present invention relates to the technical field of beam shaping for packaging and testing LD / LED semiconductor lighting sources, and in particular to a device and method for solving the problem of LD / LED output beam collimation for lighting. Background Art

[0002] LD / LED semiconductor solid-state light sources, with their advantages of environmental friendliness, high light efficiency, energy saving, and long life, are widely used in the lighting field. With the continuous advancement of semiconductor light source technology, the market is placing higher demands on the brightness and power of lighting sources. Unlike low-power lighting sources, ultra-high-power, ultra-high-brightness LD / LED light sources require precise optical integration and micro-optical control during packaging, manufacturing, and performance testing to improve optical coupling efficiency. Collimating the LD / LED output beam can effectively improve optical coupling and excitation efficiency, reduce light loss, enhance thermal stability, and achieve a high-efficiency lighting source. A Grin lens, also known as a radially gradient refractive index lens, is a 1 / 4-pitch Grin lens. When converged light is input through one end of the Grin lens, it is converted into a parallel, collimated beam after passing through it. In applications such as light integration or micro-optical control, it can replace multiple aspheric optical components to achieve beam collimation, simplifying the integrated system, reducing the number of integrated components, and reducing the size of the integrated device. Grin lenses also offer the advantages of compact structure, stable performance, and low cost. However, there is currently no case of applying self-focusing lenses in the field of LD / LED lighting.

[0003] During the packaging and optical performance testing of low-power semiconductor light source devices, the phosphor conversion material can be placed in close proximity to or in close contact with the LD / LED because the LD / LED generates little heat. However, when exciting high-power LD / LEDs, placing the phosphor conversion material in close proximity to the LD / LED can quickly accumulate significant heat, leading to thermal quenching of both the LD / LED and the phosphor conversion material. This compromises the thermal stability and reliability of the packaged lighting source, as well as the accuracy of the phosphor conversion material's optical performance testing. Therefore, to address this heat dissipation issue, a certain distance between the phosphor conversion material and the LD / LED is required during the packaging and optical performance testing of high-power LD / LED devices. However, the LD / LED output is a divergent beam. Over a certain transmission distance, the input to the phosphor conversion material causes a certain amount of optical coupling loss, increasing the loss of the LD / LED excitation light and reducing the phosphor conversion material's excitation efficiency. To improve the phosphor conversion material's excitation efficiency over a certain transmission distance, the LD / LED output beam needs to be collimated and shaped over a certain distance.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of existing technologies and provide a device and method for collimating the output beam of a LD / LED used in lighting. By incorporating a total internal reflection spherical lens and a self-focusing lens into the device, the LD / LED beam's transmission direction is changed, enabling the LD / LED beam to be focused first and then collimated. Furthermore, the working distance of the total internal reflection spherical lens and the self-focusing lens is controlled to achieve a collimated beam over a certain transmission distance. This effectively avoids thermal quenching caused by close contact between the LD / LED and the fluorescent conversion material, improves the excitation efficiency and light conversion efficiency of the fluorescent conversion material, and thus enhances the luminous efficacy of the lighting source. The device has a compact structure and is quick and simple to operate.

[0006] The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0007] A device and method for solving the problem of LD / LED output beam collimation for lighting. The device includes an LD / LED, a lens assembly, and a light spot analyzer. The LD / LED, lens assembly, and light spot analyzer are all mounted on an adjustment frame of an optical platform, with their center points located on the same horizontal optical path parallel to the optical platform.

[0008] Preferably, the LD is an ultraviolet or blue laser diode, and the LED is an ultraviolet or blue light emitting diode, with a power of more than 10W.

[0009] Preferably, the lens includes a total internal reflection spherical lens and a self-focusing lens, and the LD / LED is located inside the total internal reflection spherical lens.

[0010] Preferably, the lens is a combination of a total internal reflection lens and a spherical lens, which is used to reflect and focus the light beam.

[0011] Preferably, the self-focusing lens is a 1 / 4 pitch radial gradient refractive index lens, which is located after the total internal reflection spherical lens and is used to collimate and shape the focused light beam emitted by the spherical lens.

[0012] Preferably, the size of the photosensitive surface of the light spot analyzer is larger than the lens group, and all the light emitted from the lens group is input into the light spot analyzer.

[0013] Preferably, the LD / LED output light beam passes through a lens group and a light spot analyzer in sequence.

[0014] The present invention also provides a method for solving the problem of LD / LED output beam collimation for lighting, comprising the following steps:

[0015] (1) Run the computer to pass the output beam of the LD / LED through the lens group and the spot analyzer, and then display the spot analysis results on the computer;

[0016] (2) Adjust the height of the LD / LED and the lens assembly so that the light emitting center of the LD / LED, the central axis of the total internal reflection spherical lens, and the central axis of the self-focusing lens coincide with each other;

[0017] (3) Adjust the distance between the LD / LED and the total internal reflection spherical lens, change the front and rear position of the total internal reflection spherical lens, so that the LD / LED light outputs a focused beam through the total internal reflection spherical lens;

[0018] (4) Adjust the spacing between the lens groups and change the front and rear positions of the self-focusing lens so that the focus of the focused light beam output by the total internal reflection spherical lens coincides with the focus of the self-focusing lens at 1 / 4 pitch;

[0019] (5) Adjust the height of the spot analyzer so that the center of the output light beam passing through the lens group is aligned with the center of the photosensitive surface of the spot analyzer.

[0020] Preferably, the (2) specifically includes the following steps:

[0021] (2.1) Place the LD / LED, total internal reflection spherical lens, and self-focusing lens on adjustment mounts respectively. Adjust the adjustment mounts so that the output light of the LD / LED passes through the focused beam of the total internal reflection spherical lens and is incident on the mirror surface of the self-focusing lens.

[0022] (2.2) Adjust the adjustment frame so that the central axis of the total internal reflection spherical lens coincides with the central axis of the self-focusing lens.

[0023] Preferably, the (4) specifically includes the following steps:

[0024] (4.1) Use a spot analyzer to detect and analyze the spot of the output beam from the self-focusing lens;

[0025] (4.2) Starting from a distance of 0 from the total internal reflection spherical lens, the self-focusing lens is moved until the focus of the self-focusing lens and the focus of the focused beam of the total internal reflection spherical lens are nearly coincident at a 1 / 4 pitch;

[0026] (4.3) Fine-tune the position of the autofocus lens until the spot analyzer is moved and the size of the light spot of the transmitted light beam through the autofocus lens remains unchanged at a certain distance. Record the position of the autofocus lens at this time as distance 1. Distance 1 is the working distance d between the total internal reflection spherical lens and the autofocus lens.

[0027] (4.4) The spot of the output beam of the self-focusing lens is displayed on the interface of the computer screen through the spot analyzer.

[0028] In summary, the present invention provides a device and method for collimating the output beam of a LD / LED used in lighting. By incorporating a total internal reflection spherical lens and a self-focusing lens into the device, the LD / LED beam is collimated by adjusting the height and working distance of the lens. This improves optical coupling efficiency, reduces light loss and the excitation efficiency of the fluorescent conversion material, and avoids thermal quenching. This device has a compact structure, fast and simple beam collimation and shaping, and excellent collimation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0030] FIG1 is a schematic structural diagram of the system of the present invention;

[0031] FIG2 is a flow chart of the method of the present invention;

[0032] FIG3 is a schematic diagram of a lens assembly in the system of the present invention;

[0033] FIG4 is a schematic diagram of a process for measuring the working distance between lenses according to the present invention.

[0034] The numbers in the figure show:

[0035] 1. LD / LED; 2. Lens assembly; 3. Spot analyzer; d is the working distance; Distance 1. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0037] As shown in FIG1 , the present invention provides a device for solving the problem of LD / LED output beam collimation for lighting, comprising an LD / LED, a lens assembly, and a light spot analyzer, all of which are placed sequentially along the same center line on an optical platform.

[0038] As a preferred embodiment of the present invention, the LD is an ultraviolet or blue laser diode, and the LED is an ultraviolet or blue light emitting diode, with a power of more than 10W.

[0039] As a preferred embodiment of the present invention, the lens includes a total internal reflection spherical lens and a self-focusing lens.

[0040] As a preferred embodiment of the present invention, the photosensitive surface size of the light spot analyzer is larger than the lens group, and all the light emitted from the lens group is input into the light spot analyzer.

[0041] As a preferred embodiment of the present invention, the LD / LED output light beam passes through a lens group and a light spot analyzer in sequence, and then the light spot analysis result is displayed on a computer.

[0042] As shown in FIG2 , the present invention utilizes the above-mentioned device to implement a method for solving the problem of LD / LED output beam collimation for lighting, comprising the following steps:

[0043] (1) Run the computer to pass the output beam of the LD / LED through the lens group and the spot analyzer, and then display the spot analysis results on the computer;

[0044] (2) Adjust the height of the LD / LED and the lens assembly so that the light emitting center of the LD / LED, the central axis of the total internal reflection spherical lens, and the central axis of the self-focusing lens coincide with each other;

[0045] (3) Adjust the distance between the LD / LED and the total internal reflection spherical lens, change the front and rear position of the total internal reflection spherical lens, so that the LD / LED light outputs a focused beam through the total internal reflection spherical lens;

[0046] (4) Adjust the spacing between the lens groups and change the front and rear positions of the self-focusing lens so that the focus of the focused light beam output by the total internal reflection spherical lens coincides with the focus of the self-focusing lens at 1 / 4 pitch;

[0047] (5) Adjust the height of the spot analyzer so that the center of the output light beam passing through the lens group is aligned with the center of the photosensitive surface of the spot analyzer.

[0048] As shown in Figure 3, the LD / LED is located inside the total internal reflection spherical lens. The total internal reflection spherical lens is a combination of a total internal reflection lens and a spherical lens, and is used to reflect and focus the light beam; the self-focusing lens is a 1 / 4 pitch radial gradient refractive index lens, which is located after the total internal reflection spherical lens and is used to collimate the focused light beam output by the total internal reflection spherical lens.

[0049] As shown in Figure 4, a spot analyzer is used to detect and analyze the spot of the output light beam of the self-focusing lens. The working distance between the total internal reflection spherical lens and the self-focusing lens is adjusted. The distance range is represented by d. The focus of the output light beam through the total internal reflection spherical lens coincides with the focus of the self-focusing lens. The spot of the output light beam of the self-focusing lens is analyzed by the spot analyzer and displayed on the interface of the computer screen.

[0050] As a preferred embodiment of the present invention, the specific process is as follows:

[0051] (1) Starting from a distance of 0 from the total internal reflection spherical lens, the self-focusing lens is moved to a point where the focus of the self-focusing lens and the focus of the focused beam of the total internal reflection spherical lens are nearly coincident with each other at a 1 / 4 pitch;

[0052] (2) Fine-tune the position of the autofocus lens until the spot analyzer is moved and the size of the light spot of the transmitted light beam through the autofocus lens remains unchanged at a certain distance. Record the position of the autofocus lens at this time as distance 1, where distance 1 is the working distance d between the total internal reflection spherical lens and the autofocus lens.

[0053] (3) A spot analyzer is used to detect and analyze the spot of the output light beam of the self-focusing lens. The spot of the output light beam of the self-focusing lens is analyzed by the spot analyzer and displayed on the interface of the computer screen.

[0054] The following is a detailed description of a device that solves the problem of 35WLD output beam collimation for lighting.

[0055] As shown in Figure 3, optical glass is used as the raw material for the lens assembly. The lens includes a total internal reflection spherical lens and a self-focusing lens, and the LD is located within the total internal reflection spherical lens. The lens is a combination of the total internal reflection lens and the spherical lens, which is used to reflect and focus the light beam. The self-focusing lens is a 1 / 4 pitch lens and is located after the total internal reflection spherical lens. It is used to collimate and shape the focused light beam emitted by the spherical lens.

[0056] The fluorescent ceramic (not shown) in the device, along with the LD, lens assembly, and spot analyzer, are all mounted on an adjustment mount on the optical platform, with their centers aligned on a horizontal optical path parallel to the optical platform. The fluorescent ceramic has a diameter of 16 mm. This device adjusts the working distance between the total internal reflection spherical lens and the autofocus lens within a 5 cm range. The spot size measured by the spot analyzer is 5 mm at a distance of 5 cm from the autofocus lens, and 5 mm at a distance of 7 cm. This device effectively achieves a collimated blue light beam output by the LD.

[0057] In summary, the present invention provides a device and method for solving the problem of LD / LED output beam collimation for lighting. By incorporating a total internal reflection spherical lens and a self-focusing lens into the device, the divergence angle of the LD / LED beam is altered by controlling the working distance of the lens, achieving LD / LED beam collimation, improving light energy utilization, and avoiding thermal quenching. This system conversion improves light excitation efficiency and light conversion rate, thereby reducing light loss. This device features a compact structure, quick and simple beam collimation and shaping, and excellent collimation results.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with this profession can make some changes or modifications to the technical content disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A device and method for solving the problem of LD / LED output beam collimation for lighting, characterized in that: The device comprises LD / LED, lens group and light spot analyzer, which are all mounted on an adjustment frame of an optical platform, and the center point is on the same horizontal optical path parallel to the optical platform.

2. The LD / LED according to claim 1, characterized in that: The LD is an ultraviolet or blue laser diode, and the LED is an ultraviolet or blue light emitting diode, with a power of more than 10W.

3. The lens assembly according to claim 1, characterized in that: The lens comprises a total internal reflection spherical lens and a self-focusing lens, and the LD / LED is located inside the total internal reflection spherical lens.

4. The total internal reflection spherical lens according to claim 3, characterized in that: The lens is a combination of a total internal reflection lens and a spherical lens, and is used to reflect and focus the light beam.

5. The self-focusing lens according to claim 3, characterized in that: The self-focusing lens is a radial gradient variable refractive index lens with a 1 / 4 pitch, which is located after the total internal reflection spherical lens and is used to collimate and shape the focusing light beam emitted by the spherical lens.

6. The device for solving the problem of LD / LED output beam collimation for lighting according to claim 1, characterized in that: The size of the light spot analyzer's photosensitive surface is larger than the lens group, and all the light coming out of the lens group is input into the light spot analyzer.

7. The device for solving the problem of LD / LED output beam collimation for lighting according to claim 1, characterized in that: The LD / LED output light beam passes through a lens group and a light spot analyzer in sequence.

8. The method for solving the problem of LD / LED output beam collimation for lighting according to claim 1, characterized in that: The steps include: (1) Run the computer, pass the output beam of the LD / LED through the lens group and the spot analyzer, and display the spot analysis results on the computer; (2) Adjust the height of the LD / LED and the lens group to make the light emitting center of the LD / LED, the central axis of the total internal reflection spherical lens, and the central axis of the self-focusing lens coincide with each other; (3) adjusting the distance between the LD / LED and the total internal reflection spherical lens, changing the front and rear positions of the total internal reflection spherical lens, so that the LD / LED light outputs a focused beam through the total internal reflection spherical lens; (4) adjusting the spacing between the lens groups and changing the front and rear positions of the self-focusing lens so that the focus of the focused light beam output by the total internal reflection spherical lens coincides with the focus of the self-focusing lens at 1 / 4 pitch; (5) Adjust the height of the spot analyzer so that the center of the output light beam through the lens group is aligned with the center of the photosensitive surface of the spot analyzer.

9. A method for solving the problem of LD / LED output beam collimation for lighting according to claim 8, characterized in that: The (2) described specifically comprises the following steps: (2.1) Place the LD / LED, total internal reflection spherical lens and self-focusing lens on the adjustment frame respectively, and adjust the adjustment frame so that the output light of the LD / LED can be incident on the mirror surface of the self-focusing lens after passing through the focused beam of the total internal reflection spherical lens; (2.2) Adjust the adjustment frame so that the central axis of the total internal reflection spherical lens coincides with the central axis of the self-focusing lens.

10. A method for solving the problem of LD / LED output beam collimation for lighting according to claim 8, characterized in that: The (4) described specifically comprises the following steps: (4.1) Using a spot analyzer to detect and analyze the spot of the light beam output by the self-focusing lens; (4.2) starting from the distance 0 from the total internal reflection spherical lens, the self-focusing lens is moved until the focus of the self-focusing lens and the focus of the focusing beam of the total internal reflection spherical lens are nearly coincident at a 1 / 4 pitch; (4.3) Fine-tune the position of the self-focusing lens until the spot analyzer is moved and the size of the light spot of the transmission light beam through the self-focusing lens remains unchanged at a certain distance. Record the position of the self-focusing lens at this time as distance 1, where distance 1 is the working distance d between the total internal reflection spherical lens and the self-focusing lens. (4.4) The spot of the output light beam of the self-focusing lens is displayed on the interface of the computer screen through the spot analyzer.

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