Parabolic condenser, coating method thereof and optical system

Abstract

The invention discloses a paraboloid condenser and a coating method thereof and an optical system, the paraboloid condenser comprises at least two split parts which are arranged in a split mode, each split part comprises an incident end and an emergent end which are oppositely arranged, and a paraboloid which is formed by recessing between the incident end and the emergent end, the incident end is used for installing a light source, and the emergent end is used for installing a light source. The incident end is located on the paraboloid and located at the fixed point of the paraboloid, the emergent end is located at the opening of the paraboloid, the split parts are provided with connecting faces on the two sides of the paraboloid in the direction perpendicular to the connecting line of the incident end and the emergent end, and at least two split parts are sequentially connected through the two adjacent connecting faces. And the paraboloids of the at least two split parts are enclosed to form an annular collimation cavity. According to the technical scheme of the invention, the paraboloid condenser has good machinability and compatibility of a coating process.

Description

Technical Field

[0001] This invention relates to the field of optical element technology, and in particular to a parabolic concentrator, its coating method, and an optical system. Background Technology

[0002] It is known that conventional non-laser light sources, such as LEDs, typically have a large divergence angle (e.g., 120° in full). The light emitted by such light sources is usually not usable directly and requires a collimation system to suppress its divergence angle so that it meets the numerical aperture requirements of subsequent optical systems. Currently, one approach utilizes the optical property of a parabola that "light rays passing through the focal point are reflected by the parabola and become parallel to the axis of symmetry of the parabola." Combined with the structural characteristics of an off-axis parabolic surface, the emitting surface of the light source is placed at the end face of the off-axis parabola, allowing the light to exit within the designed angle range, resulting in a good collimation effect.

[0003] However, conventional parabolic concentrators require their length to be proportional to parameters such as the light-emitting area of ​​the light source and the divergence angle of the output beam. As a result, they have a ring-shaped thin-walled feature with a very large aspect ratio. This structure is difficult to manufacture with current machining technology, so it is often made by molding, which is not suitable for principle verification and small-batch production. Furthermore, when there is a need for coating for beams of specific wavelengths, the coating equipment uses a top-down evaporation method. This structure makes it extremely difficult to obtain a uniform coating layer at its steep upper end, which in turn prevents normal light modulation and affects the scope of application. Summary of the Invention

[0004] The main objective of this invention is to provide a parabolic concentrator that facilitates processing and coating, thereby expanding its applicability.

[0005] To achieve the above objectives, the parabolic concentrator proposed in this invention includes at least two separately arranged parts. Each of the parts includes an incident end and an exit end arranged opposite to each other, and a parabolic surface recessed between the two. The incident end is used to install the light source and is located at a fixed point on the parabolic surface. The exit end is located at the opening of the parabolic surface. In the direction perpendicular to the line connecting the incident end and the exit end, each part has a connecting surface on both sides of the parabolic surface. At least two of the parts are connected sequentially through two adjacent connecting surfaces so that the parabolic surfaces of at least two parts enclose an annular collimating cavity.

[0006] In one possible embodiment of this application, the parabolic concentrator includes four separate parts, each of which has a cuboid structure. The parabolic surface is disposed on a long edge of the separate part. The incident end and the exit end are located at the two ends in the length direction of the separate part. The parabolic surfaces of any two adjacent separate parts are symmetrically arranged with the connecting surface as the symmetrical surface.

[0007] In one possible embodiment of this application, the linear equation of the parabola along one edge of the parabola is y = px. 2 Where p is the parabolic constant, Where Δ is the size of the light-emitting surface of the light source, and θ is the final ray divergence angle.

[0008] In one possible embodiment of this application, each of the incident ends has a contact surface for contacting the light source. The contact surface is set at an angle to the end face of the incident end. In the direction from the side of the incident end away from the parabolic surface to the side closer to it, the contact surface is gradually inclined toward the exit end.

[0009] In one possible embodiment of this application, the angle between each of the bonding surfaces and the end face of the incident end is θ, and the bonding surfaces of the four split parts are located on the same plane;

[0010] And / or, the range of the final ray's exit divergence half-angle θ is less than or equal to 6°.

[0011] In one possible embodiment of this application, the intersection of the parabolic surface and the incident end is the incident end face, the diameter of the incident end face is d, wherein d is greater than or equal to the diameter of the light source, and the center of the annulus formed by the incident end face is on a straight line with the center of the light source.

[0012] In one possible embodiment of this application, the parabolic surface is coated with a reflective film.

[0013] The present invention also discloses an optical system, including a light source and a parabolic concentrator as described above, wherein the light source is disposed at the incident end, and the emitted optics are collimated by the parabolic surface before being emitted.

[0014] This invention also discloses a coating method for a parabolic concentrator, wherein the parabolic concentrator is any of the parabolic concentrators described above, and the coating method includes:

[0015] Prepare a split section, wherein the side of the split section opposite to the parabolic surface is a fixed section;

[0016] The fixed section of the split part is inserted into the insertion slot of a positioning plate so that the normal of the parabolic surface of the split part is perpendicular to the surface of the positioning plate.

[0017] The coating equipment is controlled to spray coating material in a direction perpendicular to the surface of the positioning plate to form a reflective film located on the parabolic surface.

[0018] In one possible embodiment of this application, the positioning plate has at least two insertion slots, the at least two insertion slots are arranged side by side, and one of the split parts is correspondingly inserted into one insertion slot.

[0019] The parabolic concentrator of this invention comprises at least two separate parts. Each separate part has a parabolic surface for collimation and connecting surfaces on both sides. The at least two separate parts can be sequentially connected and fixed through the connecting surfaces to form an annular collimation cavity. Thus, light emitted from the incident end is collimated by the collimation cavity and then emitted from the exit end, thereby achieving control over the divergence angle of the light source. This parabolic concentrator has a separate structure, meaning the cavity wall of the annular collimation cavity is divided into at least two open parabolic surfaces located in the separate parts. This allows for the individual processing of each separate part using CNC lathes or similar methods, without being limited by tool length or depth. Furthermore, when coating is required, the parabolic surfaces can be directly coated before assembly, giving the parabolic concentrator excellent machinability and coating process compatibility, making it suitable for various applications and broad in scope. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a structure of an embodiment of the parabolic concentrator of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the parabolic concentrator from another perspective;

[0023] Figure 3 for Figure 1 A schematic diagram of the structure of the split section in the parabolic concentrator shown;

[0024] Figure 4 for Figure 3 A schematic diagram of the structure of the shown sub-section in a Cartesian coordinate system;

[0025] Figure 5 This is a flowchart of the coating method for the parabolic concentrator of the present invention;

[0026] Figure 6 for Figure 5 The flowchart shown is a schematic diagram of the structure of the split part corresponding to the positioning plate.

[0027] Figure 7 for Figure 6 The front view of the split section shown in the positioning plate;

[0028] Figure 8 This is a schematic diagram of the positioning plate in the coating method of the parabolic concentrator of the present invention;

[0029] Figure 9 The diagram shows the light spot parameters of the light-emitting surface obtained from a ray tracing experiment simulation of the parabolic concentrator of this invention.

[0030] Figure 10 This is a distribution diagram of the divergence angle of the emitted light obtained from a ray tracing experiment using the parabolic concentrator of this invention.

[0031] Explanation of icon numbers:

[0032] label name label name 100 Parabolic concentrator 13 Launch end 100a collimation cavity 15 paraboloid 10 Split part 17 Connection surface 11 incident end 19 Fixed section 111 bonding surface 200 Positioning plate 112 Incident end face 201 Plug slot

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0038] This invention proposes a parabolic concentrator and an optical system using the parabolic concentrator. The parabolic concentrator adopts a split structure, dividing the annular collimating cavity into an open parabolic structure. This allows for individual fabrication followed by assembly and connection, achieving effective focusing and modulation of incident light while maintaining good manufacturability and compatibility with current coating equipment and processes, effectively reducing design and manufacturing costs.

[0039] Please refer to Figures 1 to 3 In one embodiment of the present invention, the parabolic concentrator 100 includes at least two separately arranged parts 10. Each part 10 includes an incident end 11 and an exit end 13 arranged opposite to each other, and a parabolic surface 15 recessed between the two. The incident end 11 is used to install the light source and is located at a fixed point on the parabolic surface 15. The exit end 13 is located at the opening of the parabolic surface 15. In the direction perpendicular to the line connecting the incident end 11 and the exit end, each part 10 has a connecting surface 17 on both sides of the parabolic surface 15. At least two parts 10 are connected sequentially through two adjacent connecting surfaces 17 so that the parabolic surfaces 15 of at least two parts 10 enclose an annular collimating cavity 100a.

[0040] In this embodiment, the parabolic concentrator 100 includes at least two separate parts 10, for example, two, four, or six, which can be assembled into a complete embedded composite parabolic surface 15. Each separate part 10 includes an incident end 11 and an exit end 13. The incident end 11 is equipped with a light source for emitting light and is located at a fixed point on the parabolic surface 15, so that after the light is emitted from the focal point of the parabolic surface 15, it is reflected by the surface of the parabolic surface 15 and then emitted parallel to the axis of symmetry of the parabolic surface 15, thereby achieving the control of the light divergence angle.

[0041] The shape of the split part 10 is not limited; for example, the shape of the split part 10 can be a cuboid, a cube, or an irregular shape. Meanwhile, to facilitate assembly, both surfaces of the parabolic surface 15 are used as connecting surfaces 17. Thus, when at least two split parts 10 are assembled, the contact area can be increased, the stability of the connection can be improved, and the parabolic surface 15 in the middle can be enclosed to form an annular collimating cavity 100a in the center. In other examples, the connecting surface 17 can also be provided on one side of the parabolic surface 15, while the other side of the parabolic surface 15 is connected only through the edge line of the parabolic surface 15.

[0042] For example, the connection between the two separate parts 10 can be by adhesive bonding, that is, the two connecting surfaces 17 can be connected by adhesive bonding, or the two separate parts 10 can be magnetically attracted, or assembled by attaching an external structure, etc., which are not limited here.

[0043] The parabolic concentrator 100 of the present invention includes at least two separate parts 10. Each separate part 10 has a parabolic surface 15 for collimation and connecting surfaces 17 located on both sides. The at least two separate parts 10 can be connected and fixed in sequence through the connecting surfaces 17 to form an annular collimation cavity 100a. In this way, the light source emits light from the incident end 11, and after being collimated by the collimation cavity 100a, it is emitted from the exit end 13, thereby realizing the control of the divergence angle of the light source. The parabolic concentrator 100 of this structure is a split structure, that is, the cavity wall of the annular collimating cavity 100a is divided into at least two open parabolic surfaces 15 located in the split part 10. In this way, the split part 10 can be processed separately by CNC lathe or other machining methods, without being limited by factors such as tool length and depth. Moreover, when coating treatment is required, the parabolic surface 15 can be coated directly and then assembled. This gives the parabolic concentrator 100 good mechanical machinability and coating process compatibility, and thus it can be used in a variety of applications, such as the production of structures for principle verification, or small-batch production applications, or the application of ultraviolet light sources in special wavelength bands, with a wide range of applications.

[0044] Please refer to Figure 2 and Figure 3 In one possible embodiment of this application, the parabolic concentrator 100 includes four separate parts 10, each of the separate parts 10 having a cuboid structure, the parabolic surface 15 being disposed on a long edge of the separate part 10, the incident end 11 and the exit end 13 being located at both ends in the length direction of the separate part 10, and the parabolic surfaces 15 of any two adjacent separate parts 10 being symmetrically arranged with the connecting surface 17 as the symmetrical surface.

[0045] In this embodiment, since the cross-sectional shape of the collimation cavity 100a is circular, the parabolic concentrator 100 is provided with four separate parts 10 for easier processing. Each separate part 10 is a cuboid structure, with the incident end 11 and the exit end 13 corresponding to the two ends along the length of the cuboid structure, and the parabolic surface 15 is located on a long edge of the separate part 10, thus providing sufficient collimation stroke and facilitating the processing of the parabolic surface 15. The overall structure of the parabolic concentrator 100 formed by assembling the four separate parts 10 is also cuboid, resulting in a neater appearance and facilitating the processing of the connecting surface 17. For example, the parabolic surfaces 15 of two adjacent separate parts 10 are symmetrically arranged with the mating connecting surface 17 as the symmetrical surface, which further facilitates processing.

[0046] Please combine Figure 3 and Figure 4 In one possible embodiment of this application, the linear equation of the parabola along one edge of the parabolic surface 15 is y = px. 2 Where p is the parabolic constant, Where Δ is the size of the light-emitting surface of the light source, and θ is the final ray divergence angle.

[0047] Understandably, as an example, parabola 15 is formed by a parabola passing through zero. Therefore, when parabola 15 is placed in a Cartesian coordinate system, one edge AD of parabola 15 is a parabola passing through zero. The starting point of the parabola is A, and the ending point is D. Its linear equation is y = px. 2 Where p is the parabolic constant, for a design conforming to a parabolic surface 15, only the luminous area of ​​the light source and the final exit divergence half-angle of the light ray need to be given to calculate it according to the above formula. At the same time, the coordinate values ​​of A and D can also be obtained, and the coordinate value of A is... The coordinates of D are The length of line segment DF is expressed as The length of line segment AE is expressed as Furthermore, the angles between line segments AE and DF and the horizontal axis are both θ. As can be seen from the figure, when the split part 10 is viewed horizontally from the front perspective, the parabolic surface 15 is an off-axis inclined surface that deviates from the vertical direction. Therefore, it is necessary to process the edge surface of the raw material with the final light ray divergence angle θ to ensure that the connecting surface 17 is parallel to the symmetry line of the two adjacent parabolic surfaces 15.

[0048] As an example of the processing method, a rectangle of appropriate length is first selected based on Δ and θ. Then, a parabola AD is drawn along its midline at the center of the side. Next, AE and EF are drawn. Then, parabola AD is rotated with EF as the center of rotation to obtain the parabolic surface 15 of the split part 10. Based on this, as an example, the HF and HH' regions are cut off again at an angle θ, and the connecting surface 17 is processed to ensure that the parabolic surfaces 15 of multiple split parts 10 can fit tightly together to form a ring-shaped composite parabolic surface 15 with good fitting effect.

[0049] In one possible embodiment of this application, each of the incident ends 11 has a contact surface 111 for contacting the light source. The contact surface 111 is set at an angle to the end face of the incident end 11. In the direction from the side of the incident end 11 away from the parabolic surface 15 to the side closer to it, the contact surface 111 is gradually inclined toward the exit end 13.

[0050] Please refer to Figure 3 In this embodiment, to facilitate the installation of the light source, a mating surface 111 is processed at the incident end 11. This mating surface 111 is set at an angle to the end face of the incident end 11. That is, the end face of the incident end 11 is cut to form an inclined surface that is inclined to the end face. Furthermore, the mating surface 111 gradually tilts towards the exit end 13 in the direction away from the parabolic surface 15 and closer to the parabolic surface 15, deviating from the horizontal axis, i.e., the AD' line. This allows the installation position of the light source and the incident end 11 to fit more closely, resulting in a better emission effect.

[0051] Please refer to Figure 4 In one possible embodiment of this application, the angle between each of the bonding surfaces 111 and the end face of the incident end 11 is θ, and the bonding surfaces 111 of the four split parts 10 are located in the same plane.

[0052] And / or, the range of the final ray's exit divergence half-angle θ is less than or equal to 6°.

[0053] As an example, the angle between the mating surface 111 and the end face of the incident end 11 is θ. This allows for the formation of an off-axis inclined plane after the four separate parts 10 are assembled, further facilitating the installation of LED beads or other planar light sources. As another example, when the light source has a special shape, such as a COB array, the mating surface 111 can be processed to have other inclination angles or shapes to adapt to the light source.

[0054] Based on the above structure, in order to obtain better emitted light, the range of the final optical emission divergence half angle θ is set to be less than or equal to 6°, for example, 6°, 5°, 4°, 3°, etc., thereby improving the utilization rate of light and saving energy.

[0055] In one possible embodiment of this application, the intersection of the parabolic surface 15 and the incident end 11 is the incident end face 112, the diameter of the incident end face 112 is d, wherein d is greater than or equal to the diameter of the light source, and the center of the annulus formed by the incident end face 112 is on a straight line with the center of the light source.

[0056] In this embodiment, to maximize the utilization of the light emitted from the light source, each component 10 is provided with an incident end face 112 at its incident end 11. This incident end face 112 is located at the intersection of the parabolic surface 15 and the mating surface 111, and is arc-shaped. When the four components 10 are assembled, the diameter of the annulus formed by the incident end faces 112 is d. The diameter of the light source is then less than or equal to this diameter d, ensuring that all light from the light source enters the collimating cavity 100a through the incident end face 112, thereby increasing the amount of emitted light and improving the utilization rate of the light source. As an example, the center of the annulus formed by the incident end face 112 is aligned with the center of the light source, resulting in more uniform emitted light from the exit end 13, concentrated in the central position, thus improving the effectiveness and concentration of the light.

[0057] For example, the diameter of the incident end face 112 can be 2 mm, while the incident angle of the light source is not limited, such as a 120° or 140° Lambert light source.

[0058] In one possible embodiment of this application, the parabolic surface 15 is coated with a reflective film.

[0059] In this embodiment, when applied to a light source with a specific wavelength, such as an ultraviolet LED light source with a center wavelength of approximately 367.5 nm, conventional mirrored metal can only achieve a reflectivity of 80% or even lower, and the reflectivity decreases after multiple reflections. Therefore, to obtain a better reflection effect, a reflective film is deposited on the parabolic surface 15. This reflective film can be made of materials such as aluminum or gold, which have high reflectivity, thereby improving the reflectivity of the light source with a specific wavelength and thus improving the light energy utilization rate of the light source. Furthermore, the split structural design facilitates the coating of the parabolic surface 15, and with the help of coating equipment, a relatively uniform reflective film can be easily obtained, further improving the reflection effect and light energy utilization rate, achieving a reflection efficiency of 99%.

[0060] It should be noted that the center of the split parabolic surface 15 is easier to coat than the edge. The coating effect at the edge is slightly weaker than at the center due to the smoother curvature change. However, even with four split parts 10, the reflectivity of the edge coating of the parabolic concentrator 100 reaches 95%, which is much higher than the reflectivity of the uncoated parabolic surface 15. Therefore, although a larger number of split parts 10 can result in a smaller curvature at the edge of the parabolic surface 15, facilitating coating, it is exemplary to have 2, 4, or 6 split parts 10. This not only improves the coating uniformity of the parabolic surface 15 of the split parts 10 but also facilitates assembly and improves assembly efficiency.

[0061] The present invention also discloses an optical system, including a light source and a parabolic concentrator 100 as described above. The light source is disposed at the incident end 11, and the emitted optics are collimated by the parabolic surface 15 before being emitted. Since the parabolic concentrator 100 of the optical system includes the structure of the parabolic concentrator 100 of any of the above embodiments, the beneficial effects brought by any of the above embodiments will not be elaborated here.

[0062] As an example, this optical system is used in lithography equipment to provide a light source for the exposure of substrates. However, this optical system is not limited to the aforementioned equipment and can also be used in other equipment that requires collimation of the light source, such as display devices.

[0063] Please refer to Figures 5 to 8 The present invention also discloses a coating method for a parabolic concentrator 100, wherein the parabolic concentrator 100 is any of the parabolic concentrators described above, and the coating method includes:

[0064] Step S1: Prepare a split part 10, wherein the side of the split part 10 facing away from the parabolic surface 15 is a fixed section 19;

[0065] Step S2: Insert the fixing section 19 of the split part 10 into the insertion slot 201 of a positioning plate 200 so that the normal of the parabolic surface 15 of the split part 10 is perpendicular to the surface of the positioning plate 200.

[0066] Step S3: Control the coating equipment to spray coating material in a direction perpendicular to the surface of the positioning plate 200 to form a reflective film located on the parabolic surface 15.

[0067] In this embodiment, step S1 is performed after the split part 10 has been processed but before assembly and connection. Here, the processing method of the split part 10 can refer to the above embodiment. As an example, the luminous surface size Δ of the light source can be set to 2mm, and the final light emission divergence half-angle θ can be set to 6°. Combining the above formula, the parabola constant p = 0.2263409, and the parabola equation is y = 0.2263409x. 2 The starting coordinates of the parabola should be (1.989044, 0.895472), and the ending coordinates should be (21.01777, 99.98537). The length of the split part 10 is 100mm. Based on the above parameters, a metal blank of suitable size is selected, and a parabolic surface 15 is machined from within the metal blank using a CNC machine tool or other machining methods, rotating according to a parabolic equation. The metal blank is then machined at a 6° angle using the cutting method described in the above embodiment, thereby obtaining the split part 10. To facilitate fixing the split part 10, the side facing away from the parabolic surface 15 is designated as a fixed segment 19, which facilitates subsequent coating processing. Here, the fixed segment 19 is also a long edge of a cuboid structure, with a simple structure that requires no complex processing, simplifying the process.

[0068] In step S2, a positioning plate 200 is provided to fix the fixed part 10. The positioning plate 200 has an insertion groove 201 adapted to the fixing section 19. That is, the space of the insertion groove 201 is triangular in shape, so that it can be fixed with the fixing section 19 by interference fit. This fixing method is simple and convenient, and can improve the fixing efficiency and coating efficiency. The fixing direction is that the normal of the parabola 15 is perpendicular to the surface of the positioning plate 200. It should be noted that the normal of the parabola 15 refers to the normal at the center position of the parabola 15 in the width direction, so that the parabola 15 is fully exposed in the effective area of ​​the coating equipment. In other examples, other fixing structures can also be set to fix the part 10 to ensure the stability of the installation.

[0069] In one possible embodiment of this application, the positioning plate 200 has at least two insertion slots 201, the at least two insertion slots 201 are arranged side by side, and a split part 10 is correspondingly inserted into an insertion slot 201.

[0070] In this embodiment, to further improve coating efficiency, at least two insertion slots 201 are provided on the positioning plate 200. As an example, these slots can correspond to the number of the split parts 10, allowing each split part 10 to be placed in one-to-one within the insertion slot 201, while simultaneously coating multiple split parts 10, thus improving coating efficiency and effectively saving costs. In other examples, more insertion slots 201 than the number of split parts 10 can be provided to achieve mass production.

[0071] In step S3, the coating equipment can be a conventional coating equipment, positioned above the positioning plate 200, capable of spraying coating material from top to bottom. The specific spraying rate and spraying time can be set according to the thickness of the obtained reflective film, which will not be elaborated here. In this way, a uniform reflective film can be obtained on the parabolic surface 15 of the split part 10.

[0072] It should be noted that during the processing of the parabolic condenser 100, after the coating is completed, the next step is to assemble and connect at least two separate parts 10, that is, to attach them together through the connecting surface 17 to obtain a complete composite parabolic condenser lens 15 and collimating cavity 100a, and the collimating cavity 100a is coated with a uniform reflective film.

[0073] It should be noted that the diameter of the light-emitting surface of the composite parabolic condenser 15 obtained through the above processing method should be 19.13354 mm, and the length of the composite parabolic condenser 100 is approximately 100 mm. When the light source is attached to the bonding surface 111, the light emitted from the incident end face 112 and exiting from the end face 13 can produce a rotationally symmetrical collimated spot. This can be proven experimentally; please refer to [reference needed]. Figure 9 When light is incident at a maximum divergence angle of 120°, Figure 9 The image shows the light spot distribution on the light-emitting surface obtained from simulation using Lighttools ray tracing software. It can be seen that the light spot diameter maintains good consistency with the theoretical design value.

[0074] Subsequently, by communicating with MATLAB and Lighttools software, the emission angles of 10,000 rays on this target surface were read. It was found that the divergence half-angle of all rays was within the design value of 6° (inclusive). Figure 10 As shown, the total light energy utilization rate reaches over 92% for ultraviolet light with a center wavelength of 367.5nm, which fully demonstrates the collimation effectiveness of the parabolic concentrator 100 proposed in this invention for special light sources and light sources with large divergence angles.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the protection scope of the present invention.

Claims

1. A parabolic concentrator for collimating a light source, characterized in that, The device includes at least two separate parts, each of which includes an incident end and an exit end arranged opposite to each other, and a parabolic surface recessed between them. The incident end is used to install the light source and is located at a fixed point on the parabolic surface. The exit end is located at the opening of the parabolic surface. In the direction perpendicular to the line connecting the incident end and the exit end, each part has a connecting surface on both sides of the parabolic surface. At least two parts are connected sequentially through two adjacent connecting surfaces so that the parabolic surfaces of at least two parts enclose and form an annular collimation cavity.

2. The parabolic concentrator as described in claim 1, characterized in that, The parabolic concentrator includes four sub-sections, each sub-section having a cuboid structure. The parabolic surface is located on a long edge of the sub-section. The incident end and the exit end are located at the two ends along the length of the sub-section. The parabolic surfaces of any two adjacent sub-sections are symmetrically arranged with the connecting surface as the symmetrical surface.

3. The parabolic concentrator as described in claim 2, characterized in that, The linear equation for the parabola along one edge of the parabola is y = px. 2 Where p is the parabolic constant, Where Δ is the size of the light-emitting surface of the light source, and θ is the final ray divergence angle.

4. The parabolic concentrator as described in claim 3, characterized in that, Each of the incident ends has a contact surface for contacting the light source. The contact surface is set at an angle to the end face of the incident end. In the direction from the side of the incident end away from the parabolic surface to the side closer to it, the contact surface is gradually inclined toward the exit end.

5. The parabolic concentrator as described in claim 4, characterized in that, The angle between each of the bonding surfaces and the end face of the incident end is θ, and the bonding surfaces of the four split parts are located on the same plane; And / or, the range of the final ray's exit divergence half-angle θ is less than or equal to 6°.

6. The parabolic concentrator as described in claim 1, characterized in that, The intersection of the parabolic surface and the incident end is the incident end face, the diameter of the incident end face is d, where d is greater than or equal to the diameter of the light source, and the center of the annulus formed by the incident end face is on the same straight line as the center of the light source.

7. The parabolic concentrator as described in claim 1, characterized in that, The parabolic surface is coated with a reflective film.

8. An optical system, characterized in that, It includes a light source and a parabolic concentrator as described in any one of claims 1 to 7, wherein the light source is located at the incident end, and the emitted optics are collimated by the parabolic surface before being emitted.

9. A coating method for a parabolic concentrator, characterized in that, The parabolic concentrator is a parabolic concentrator as described in any one of claims 1 to 7, and the coating method includes: Prepare a split section, wherein the side of the split section opposite to the parabolic surface is a fixed section; The fixed section of the split part is inserted into the insertion slot of a positioning plate so that the normal of the parabolic surface of the split part is perpendicular to the surface of the positioning plate. The coating equipment is controlled to spray coating material in a direction perpendicular to the surface of the positioning plate to form a reflective film located on the parabolic surface.

10. The coating method for a parabolic concentrator as described in claim 9, characterized in that, The positioning plate has at least two insertion slots, which are arranged side by side, and one of the split parts is inserted into one insertion slot.

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