Light uniformizing rod and lighting system

Abstract

The utility model relates to a dodging rod and an illumination system, the dodging rod is formed by processing based on a dodging base rod, the dodging rod is of a spiral structure and comprises a screw rod body and a spiral thread formed by cutting around the screw rod body, the spiral thread has a target screw pitch and a target depth, and the target depth is determined based on a difference value between a large diameter and a small diameter of the spiral thread. The number of times of reflection of the light beam in the dodging rod is determined based on the target pitch and / or the target depth. In the utility model, the dodging rod can be formed by directly cutting the dodging base rod, the processing is convenient, and the setting of the required reflection times can be realized by only one dodging rod without adding other optical devices, so that the cost is saved; furthermore, the reflection times of the light beam by the light uniformizing rod can be adjusted based on the target screw pitch and the target depth of the spiral thread, so that the light uniformizing effect is conveniently adjusted, and the light uniformizing effect of the light uniformizing rod is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical technology field, concretely relates to a light rod and lighting system. BACKGROUND

[0002] The light rod, also known as a light rod or a light guide pipe, is usually used for homogenizing light beams. In terms of structural composition, it can be divided into solid light rods or hollow light rods. The solid light rod uses the principle of total reflection to reflect the light entering the inside of the light rod and then exit after multiple total reflections. The hollow light rod is usually formed by splicing four side walls coated with high-reflective film on the inner wall, and uses the high-reflective film on the inner wall to reflect the light beam entering the inside of the light rod multiple times. Due to the multiple reflections of light beams with multiple divergence angles, the purpose of uniform distribution of light beams can be achieved, thereby realizing the homogenization effect of the light rod.

[0003] In applications such as projection lighting systems and microscopic imaging lighting systems, the light source usually uses a high-coherence and high-power laser light source. The light rod is usually arranged at the connection position of the lighting light source and the optical machine part, used to receive the incident light of a certain angle range emitted by the light source, and then output the homogenized light beam to the subsequent lighting components, into the projection objective lens or the microscopic objective lens, and finally realize uniform illumination or imaging.

[0004] Generally, the conventional method uses a lens group to expand and collimate the laser light beam, and then the light beam is incident into the light rod. Since the divergence angle of the laser light beam is much smaller than that of the LED light source, most of the light beam directly penetrates the light rod, and only the light beam near the outer side of the divergence angle can be totally reflected in the light rod. Chinese Patent No. CN112925104B uses an angle array light rod to increase the number of reflections of the light beam in the light rod. As shown in Figure 1 , but this structure of the light rod is not easy to manufacture, and the sawtooth structure is only on the inside of the light rod surface. If the light source uses a laser light beam, most of the light beam cannot be totally reflected and directly exits the light rod. Chinese Patent No. CN109946908A provides a diffraction layer containing a diffraction pattern in the inside or / and end face of the light rod to enhance the homogenization effect of the light rod. As shown in Figure 2 , although the addition of a diffraction layer between the two light rods can diffract the laser light beam to increase the divergence angle and reduce the laser light beam that directly exits the light rod without reflection, the use of two light rods and an optical diffraction assembly results in high cost. US10162268B2 uses the 'Twisted kaleido' method to twist the rectangular columnar light rod so that the input face and the output face are twisted to each other, and the twist is between about 5 degrees and about 15 degrees. As shown in Figure 3As shown, although the patent increases the reflection times of the light beam in the light homogenizing rod by twisting, most of the light beam energy of the low divergence angle laser beam directly passes through the light homogenizing rod without internal reflection. Utility model content

[0005] The utility model solves the problems of the prior art that the light homogenizing rod and the lighting system are complicated to process, high in cost, and poor in light homogenizing effect.

[0006] According to one aspect of the present application, a light homogenizing rod is disclosed, which is processed based on a light homogenizing base rod and has a spiral structure, including a screw rod body and a spiral thread formed by cutting around the screw rod body. The spiral thread has a target pitch and a target depth, and the target depth is determined based on the difference between the large diameter and the small diameter of the spiral thread. The reflection times of a light beam in the light homogenizing rod are determined based on the target pitch and / or the target depth.

[0007] In one embodiment, the light homogenizing base rod includes one of an oblong column, a cylinder, or a polyhedral column.

[0008] In one embodiment, the light homogenizing rod has a column structure.

[0009] In one embodiment, the light homogenizing rod has a cone structure, and includes an incident light end face and an outgoing light end face. The area of the incident light end face is different from the area of the outgoing light end face.

[0010] According to another aspect of the present application, a lighting system is also disclosed, which includes a laser, a lens assembly, and any of the above-mentioned light homogenizing rods. The laser is used to emit a laser beam. The light homogenizing rod is arranged between the laser and the lens assembly. The light homogenizing rod is used to reflect the laser beam to obtain a light homogenizing beam, which is then transmitted to the lens assembly. The lens is used to collimate and focus the light homogenizing beam to project it to a target position.

[0011] In some embodiments, the lens assembly includes a collimating mirror and a focusing mirror. The collimating mirror is arranged between the light homogenizing rod and the focusing mirror. The collimating mirror is used to collimate the light homogenizing beam to obtain a light homogenizing collimated beam. The focusing mirror is used to focus the light homogenizing collimated beam to obtain a collimated and focused beam, which is then projected to the target position.

[0012] In some embodiments, the illumination system further comprises a microlens assembly disposed between the laser and the homogenizing rod, the microlens assembly being configured to perform initial homogenization focusing on the laser beam output by the laser to obtain an initial homogenization focused beam, and then input the initial homogenization focused beam into the homogenizing rod so that the homogenizing rod performs re-homogenization on the initial homogenization focused beam to obtain a target homogenization beam.

[0013] In some embodiments, the microlens assembly comprises a target layer lens array and a condenser lens, the target layer lens array being disposed between the laser and the condenser lens, and the condenser lens being disposed between the target layer lens array and the homogenizing rod, the target layer lens array being configured to perform initial homogenization on the laser beam to obtain an initial homogenization beam, and the condenser lens being configured to focus the initial homogenization beam to obtain the initial homogenization focused beam.

[0014] In some embodiments, the target layer lens array is a single layer lens array or a double layer lens array.

[0015] In some embodiments, the condenser lens is a Fresnel lens.

[0016] The utility model discloses a light homogenization system and a light illumination system, which can effectively disperse and homogenize the light beam, improve the uniformity of the output light, and reduce hot spots and shadows. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below.

[0018] Figure 1is a light uniformization rod structure in the prior art;

[0019] Figure 2 is another light uniformization rod structure in the prior art;

[0020] Figure 3 is another light uniformization rod structure in the prior art;

[0021] Figure 4 is a structural schematic view of a light uniformization rod with a target pitch according to an embodiment of the present application;

[0022] Figure 5 is a structural schematic view of another light uniformization rod with a target pitch according to an embodiment of the present application;

[0023] Figure 6 is a structural schematic view of another light uniformization rod according to an embodiment of the present application;

[0024] Figure 7 is a structural schematic view of a lighting system according to an embodiment of the present application;

[0025] Figure 8 is a structural schematic view of another lighting system according to an embodiment of the present application;

[0026] Figure 9 is a structural schematic view of another lighting system according to an embodiment of the present application;

[0027] Figure 10 is a principle schematic view of a microlens assembly according to an embodiment of the present application;

[0028] In the figure, 1 is a laser, 2 is a microlens assembly, 21 is a single-layer lens array, 22 is a double-layer lens array, 23 is a condenser lens, 3 is a light uniformization rod, 31 is an entrance end face, 32 is an exit end face, and 4 is a lens assembly. DETAILED DESCRIPTION

[0029] In order to make the person in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person in the art without creative labor should belong to the protection scope of the present application.

[0030] References to "one embodiment" or "embodiment" herein refer to specific features, structures, or characteristics that may be included in at least one implementation of the present invention. In the description of the present invention, it should be understood that the terms "upper," "inner," and "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplification. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features referred to. Thus, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features. Furthermore, the terms "first," "second," etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0031] To address the problems existing in the prior art, the present application provides a light-dispersing rod. Specifically, the light-dispersing rod 3 has a spiral structure and is formed by machining a light-dispersing base rod. In one example, the light-dispersing rod 3 can be formed by cutting a rectangular cylinder, a circular cylinder, or a polyhedral column. It is understood that the shape of the light-dispersing base rod processed into the light-dispersing rod 3 is not limited to the above shapes and can also be other shapes, such as irregular shapes. As long as the light-dispersing rod 3 can be cut, the shape of the light-dispersing base rod is not limited.

[0032] Specifically, after processing is completed, Figure 4 As shown, the light homogenizing rod 3 is a cylindrical structure, including a screw body and a spiral thread formed by cutting around the screw body. The spiral thread has a target pitch and a target depth. The target depth is determined based on the difference between the major diameter and the minor diameter of the spiral thread. The number of reflections of the light beam in the light homogenizing rod 3 is determined based on the target pitch and / or the target depth. In one example, as Figure 4 and Figure 5 Comparison, Figure 5 The target pitch is less than Figure 4 When the target pitch is constant, the number of reflections increases as the target pitch decreases. Furthermore, when the target pitch remains constant, the number of reflections increases as the target depth increases. It is understood that in the actual cutting process, the target pitch and target depth can be adjusted simultaneously to meet the requirements of different number of reflections.

[0033] Furthermore, in another example, after the processing is completed, Figure 6As shown, the light uniformity rod 3 is a cone structure, including an entrance end surface 31 and an exit end surface 32, wherein the area of the entrance end surface 31 is different from the area of the exit end surface 32, and in this example, the area of the entrance end surface 31 is smaller than the area of the exit end surface 32.

[0034] The utility model discloses a light uniformity rod 3 is processed into spiral structure, can effectively disperse and homogenization light beam, make the intensity distribution of output light more uniform, reduce hot spot and shadow, further, through the control target pitch size and the cutting depth (target depth) of processing time, can control the reflection number of light beam in light uniformity rod 3 based on demand, effectively optimize the propagation path of light, improve the utilization of light, further, the shape (oblong, cylinder or polyhedral column) of light uniformity base rod provides the flexible design selection, makes it can adapt to different optical demand and installation environment.

[0035] Further, according to another aspect of the present application, there is also provided a lighting system. In one embodiment, as shown in Figure 7 The lighting system includes a laser 1, a lens assembly 4 and the light uniformity rod 3 of any one of the above, the laser is used for emitting a laser beam, the light uniformity rod 3 is arranged between the laser 1 and the lens assembly 4, the light uniformity rod 3 is used for reflecting the laser beam to obtain a uniform light beam and then transmitting the uniform light beam to the lens assembly 4, and the lens is used for projecting the uniform light beam after collimation and focusing treatment to a target position. By placing the light uniformity rod 3 between the laser 1 and the lens assembly 4, the laser beam can be effectively reflected and homogenized, ensuring the uniformity and stability of the output light beam; in one example, the lens assembly 4 includes a collimating mirror and a focusing mirror, the collimating mirror is arranged between the light uniformity rod 3 and the focusing mirror, the collimating mirror is used for collimating the uniform light beam to obtain a collimated uniform light beam, and the focusing mirror is used for focusing the collimated uniform light beam to obtain a collimated and focused light beam and then projecting the collimated and focused light beam to the target position.

[0036] In some embodiments, as shown in Figure 8 and Figure 9 The lighting system further includes a microlens assembly 2, the microlens assembly 2 is arranged between the laser 1 and the light uniformity rod 3, the microlens assembly 2 is used for initially homogenizing and focusing the laser beam output by the laser 1 to obtain an initial homogenized and focused light beam, then inputting the initial homogenized and focused light beam to the light uniformity rod 3, so that the light uniformity rod 3 homogenizes the initial homogenized and focused light beam again to obtain a target uniform light beam. The addition of the microlens assembly 2 makes the laser beam first homogenized and focused before entering the light uniformity rod 3, improving the quality of the light beam and ensuring better optical performance. Specifically, as shown in Figure 10 The microlens array combination of the microlens assembly 2 can realize the function of homogenization. The principle of microlens array homogenization is as shown in Figure 10 wherein θ1 is the incident angle of the rear surface of the microlens array, θ２ is the exit angle, the output spot size is h, and the thickness of the micro-cylindrical lens is h. The light field distribution uniformity depends on the number of sub-beams or the number of micro-lenses. Figure 10 In the embodiment, the condenser is located behind the micro-lens array, which focuses the light beams segmented by the micro-lens array to form the required uniform light field distribution.

[0037] In some embodiments, the micro-lens assembly 2 includes a target layer lens array and a condenser lens 23. The target layer lens array is arranged between the laser 1 and the condenser lens 23, and the condenser lens 23 is arranged between the target layer lens array and the homogenizing rod 3. The target layer lens array is used to perform initial homogenization of the laser beam to obtain an initial homogenized light beam, and the condenser lens 23 is used to focus the initial homogenized light beam to obtain an initial homogenized focused light beam.

[0038] In some embodiments, as shown in Figure 8 , the target layer lens array can be a single-layer lens array 21, and as shown in Figure 9 , the target layer lens array can be a double-layer lens array 22. The design of the target layer lens array (single layer or double layer) provides flexible beam shaping capability, which can adjust the shape and characteristics of the light beam according to specific application requirements, further improving the uniformity and quality of the light.

[0039] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0040] The above shows and describes the basic principles, connection methods, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, the present application can have various changes and improvements, and these changes and improvements fall within the scope of the claimed present application.

Claims

1. A light homogenizing rod, characterized in that, The homogenization rod (3) is formed based on a homogenization base rod, the homogenization rod (3) is a spiral structure, comprising a screw body and a spiral thread formed by cutting around the screw body, the spiral thread has a target pitch and a target depth, the target depth is determined based on the difference between the large diameter and the small diameter of the spiral thread, and the number of reflections of a light beam in the homogenization rod (3) is determined based on the target pitch and / or the target depth.

2. The light homogenizing rod of claim 1, wherein The homogenization base rod comprises one of a rectangular column, a circular column or a polyhedral column.

3. The light homogenizing rod of claim 1, wherein, The homogenization rod (3) is a column structure.

4. The light homogenizing rod of claim 1, wherein, The homogenization rod (3) is a cone structure, and the homogenization rod (3) comprises an incident light end face (31) and an outgoing light end face (32), the area of the incident light end face (31) is different from the area of the outgoing light end face (32).

5. A lighting system, characterized by The lighting system comprises a laser (1), a lens assembly (4) and the homogenization rod according to any one of claims 1 to 4, the laser is used for emitting a laser beam, the homogenization rod (3) is arranged between the laser (1) and the lens assembly (4), the homogenization rod (3) is used for reflecting the laser beam to obtain a homogenization light beam and then transmitting the homogenization light beam to the lens assembly (4), and the lens is used for collimating and focusing the homogenization light beam to project the collimated and focused light beam to a target position.

6. The lighting system of claim 5, characterized in that The lens assembly (4) comprises a collimating mirror and a focusing mirror, the collimating mirror is arranged between the homogenization rod (3) and the focusing mirror, the collimating mirror is used for collimating the homogenization light beam to obtain a homogenization collimated light beam, and the focusing mirror is used for focusing the homogenization collimated light beam to obtain a collimated and focused light beam and then projecting the collimated and focused light beam to the target position.

7. The lighting system of claim 6, wherein, The lighting system further comprises a microlens assembly (2), the microlens assembly (2) is arranged between the laser (1) and the homogenization rod (3), the microlens assembly (2) is used for initially homogenizing and focusing the laser beam output by the laser (1) to obtain an initial homogenization and focusing light beam, then inputting the initial homogenization light beam to the homogenization rod (3), so that the homogenization rod (3) homogenizes the initial homogenization and focusing light beam again to obtain a target homogenization light beam.

8. The lighting system of claim 7, characterized in that The microlens assembly (2) comprises a target layer lens array and a condenser lens (23), the target layer lens array is arranged between the laser (1) and the condenser lens (23), and the condenser lens (23) is arranged between the target layer lens array and the homogenization rod (3), the target layer lens array is used for initially homogenizing the laser beam to obtain an initial homogenization light beam, and the condenser lens (23) is used for focusing the initial homogenization light beam to obtain the initial homogenization and focusing light beam.

9. The lighting system of claim 8, wherein, The target layer lens array is a single layer lens array (21) or a double layer lens array (22).

10. The lighting system of claim 8, wherein, The condenser lens (23) is a Fresnel lens.

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