Light emitting device and weeding method by light supplementation

Abstract

This application provides a light-emitting device and a method for supplemental lighting and weed control, belonging to the field of optical equipment technology. The light-emitting device includes a light source and a focusing assembly. Each light source emits a light beam of a specific wavelength. The focusing assembly is located on the light-emitting side of the light source and is used to guide the light beam emitted by the light source to the target plant. The light-emitting device has at least two states; in a first state, the light beam emitted by the focusing assembly includes a non-converging beam or a converging beam converging at a first convergence point, used to supplement the target plant with light. In a second state, the light beam emitted by the focusing assembly includes a converging beam converging at a second convergence point, used to damage the target plant; the distance between the second convergence point and the target plant is smaller than the distance between the first convergence point and the target plant when the light beam emitted by the focusing assembly in the first state includes a converging beam. This application integrates the functions of supplemental lighting and weed control into the same light-emitting device, which can reduce the overall cost of the equipment and improve the efficiency of work coordination.

Description

Technical Field

[0001] This invention relates to the field of optical equipment technology, and more specifically, to a light-emitting device and a method for supplemental lighting for weed control. Background Technology

[0002] The application of laser technology in agriculture is becoming increasingly widespread, mainly in two aspects: one is to irradiate the target plant with a beam of light emitted from a laser source to supplement the light of the target plant and thus promote the photosynthesis of the target plant; the other is to destroy the cells or growth state of the target plant with a beam of light emitted from a laser source to achieve the purpose of weeding.

[0003] However, because supplemental lighting and weeding have different requirements for lasers, current laser supplemental lighting equipment and laser weeding equipment are both independently designed and operated single-function devices, resulting in high overall equipment costs and low efficiency in operation coordination. Summary of the Invention

[0004] This application addresses the shortcomings of existing methods by proposing a light-emitting device and a supplemental lighting weeding method. This addresses the technical problems of current laser supplemental lighting devices and laser weeding devices being independently designed and operated single-function devices, resulting in high overall equipment costs and low operational efficiency.

[0005] In a first aspect, embodiments of this application provide a light-emitting device, comprising: At least one light source, each light source being used to emit a beam of light of one wavelength; The focusing assembly, located on the light-emitting side of the light source, is used to guide the light beam emitted by the light source to the target plant. The light-emitting device has at least two states; in the first state, the light beam emitted by the focusing component includes a non-converging beam or a converging beam converging at a first convergence point, which is used to supplement the target plant with light. In the second state, the beam emitted by the focusing component includes a converging beam that converges at a second convergence point, which is used to destroy the target plant; the distance between the second convergence point and the target plant is smaller than the distance between the first convergence point and the target plant when the beam emitted by the focusing component in the first state includes a converging beam.

[0006] In some embodiments, the light source includes: The first light source is used to emit a beam of light of the first wavelength; A second light source, used to emit a beam of light with a second wavelength; In the second state, both the first light source and the second light source emit light, and the second convergence point includes the first sub-convergence point where the light beam of the first wavelength passes through the focusing component and the second sub-convergence point where the light beam of the second wavelength passes through the focusing component; the distance between the first sub-convergence point and the second sub-convergence point and the target plant does not exceed 10mm.

[0007] In some embodiments, the light source further includes: a third light source for emitting a light beam of a designed wavelength; the designed wavelength is less than a second wavelength and greater than a first wavelength, and the difference between the designed wavelength and the first wavelength is less than the difference between the designed wavelength and the second wavelength; In the second state, the target plant is located between the first sub-convergence point and the second sub-convergence point, and the beam of the designed wavelength is focused on the target plant by the focusing component.

[0008] In some embodiments, the focusing component is movable along its own optical axis to ensure that, in the second state, the first sub-convergence point is located at the target plant for a portion of the time, and the second sub-convergence point is located at the target plant for another portion of the time.

[0009] In some embodiments, the focusing assembly includes: a first lens and a second lens arranged sequentially along the light emission direction of the focusing assembly; The first lens and / or the second lens are movable along the light output direction of the focusing assembly.

[0010] In some embodiments, the focusing assembly includes: The first reflecting mirror is tilted in the direction of light emission from the light source; The second reflector is positioned in the light-emitting direction of the first reflector and is parallel to the first reflector. The third reflector is tilted in the light-emitting direction of the second reflector and is symmetrically arranged with respect to the second reflector; the second and third reflectors together form the first reflector pair. The fourth reflector is positioned in the light-emitting direction of the third reflector and is parallel to the third reflector; the first reflector and the fourth reflector form the second reflector pair; The incident light direction of the first reflector is collinear with the exit light direction of the fourth reflector, and the distance between the first reflector pair and the second reflector pair is adjustable.

[0011] In some embodiments, in the first state, the first light source emits light; The first wavelength is not less than 425nm and not more than 475nm, and the second wavelength is not less than 1445nm and not more than 1495nm.

[0012] In some embodiments, the light-emitting device further includes: A steering component is positioned between the light source and the focusing component; the light-emitting end of the steering component is fixedly connected to the light-input end of the focusing component. The steering assembly includes at least one fifth reflector and a rotating mechanism. The light-incident surface of the fifth reflector is at an angle to the light-out direction of the light source. The rotating mechanism is rotatably connected to the fifth reflector, so that the angle between the fifth reflector and the light-out direction of the light source is adjustable.

[0013] Secondly, embodiments of this application provide a method for supplemental lighting and weed control based on any of the light-emitting devices provided in the first aspect above, comprising: Control at least one light source to emit a light beam of at least one wavelength; The light-emitting device is controlled to be in the first state, so that the light beam emitted by the focusing component includes a non-converging beam or a convergent beam that converges to the first convergence point, for supplementing light to the target plant; The light-emitting device is controlled to be in a second state, such that the light beam emitted by the focusing component includes a converging light beam that converges at a second convergence point, which is used to destroy the target plant; the distance between the second convergence point and the target plant is smaller than the distance between the first convergence point and the target plant when the light beam emitted by the focusing component in the first state includes a converging light beam.

[0014] In some embodiments, controlling the light-emitting device to be in a second state includes: Both the first and second light sources emit light, and the focusing component moves along its own optical axis, so that in the second state, the first sub-convergence point is located at the target plant for a part of the time, and the second sub-convergence point is located at the target plant for another part of the time. In addition, controlling the light-emitting device to be in the first state includes: turning off the second light source and controlling the position of the focusing component.

[0015] The beneficial effects of the technical solutions provided in this application include: This application adjusts the working state of the light-emitting device and the focusing component to make the degree of defocusing of the beam different in different working states, thereby achieving the switching between the first state and the second state to realize the functions of supplemental lighting and weeding respectively. In this way, the functions of supplemental lighting and weeding are integrated into the same light-emitting device, which can reduce the overall cost of the equipment and improve the efficiency of operation.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is one of the structural schematic diagrams of a light-emitting device in a first state provided in an embodiment of this application; Figure 2This is one of the structural schematic diagrams of a light-emitting device in a second state provided in an embodiment of this application; Figure 3 This is a second schematic diagram of the structure of a light-emitting device in a second state, as provided in an embodiment of this application. Figure 4 This is the third schematic diagram of the structure of a light-emitting device in a second state, as provided in the embodiments of this application. Figure 5 This is the second schematic diagram of the structure of a light-emitting device in the first state provided in the embodiments of this application; Figure 6 The fourth schematic diagram of a light-emitting device in a second state provided in the embodiments of this application; Figure 7 This is a flowchart illustrating a method for supplemental lighting and weed removal using a light-emitting device, as provided in an embodiment of this application.

[0019] Figure label: 10 - Light source; 11 - First light source; 12 - Second light source; 20-Focusing assembly; 21-First lens; 22-Second lens; 23-First reflecting mirror; 24-Second reflecting mirror; 25-Third reflecting mirror; 26-Fourth reflecting mirror; 30 - Target plants; 40 - First convergence point; 50 - Second convergence point; 51 - First sub-convergence point; 52 - Second sub-convergence point; 60 - Steering assembly; 61 - Fifth reflector. Detailed Implementation

[0020] The embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the embodiments described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions of the embodiments of this application.

[0021] Those skilled in the art will understand that, unless specifically stated otherwise, the terms "described" and "the" as used herein may also include plural forms. It should be further understood that the term "comprising" as used in this application's specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude other features, information, data, steps, operations, elements, components, and / or combinations thereof supported by this art. It should be understood that when we say an element is "connected" to another element, the element may be directly connected to the other element, or it may mean that the element and the other element are connected through an intermediate element. The term "and / or" as used herein refers to at least one of the items defined by the term; for example, "A and / or B" can be implemented as "A," or as "B," or as "A and B."

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0023] Please refer to Figures 1-6 This application provides a light-emitting device, including at least one light source 10 and a focusing component 20.

[0024] Each light source 10 is used to emit a beam of light of one wavelength.

[0025] The focusing component 20 is located on the light-emitting side of the light source 10 and is used to transmit the light beam emitted by the light source 10 to the target plant 30.

[0026] The light-emitting device has at least two states; in the first state, the light beam emitted by the focusing assembly 20 includes a non-converging beam or a converging beam converging at a first convergence point 40, which is used to supplement the light of the target plant 30.

[0027] In the second state, the beam emitted by the focusing assembly 20 includes a converging beam that converges at the second convergence point 50, which is used to destroy the target plant 30; the distance between the second convergence point 50 and the target plant 30 is smaller than the distance between the first convergence point 40 and the target plant 30 when the beam emitted by the focusing assembly 20 in the first state includes a converging beam.

[0028] In this embodiment, by adjusting the working state of the light-emitting device and adjusting the focusing component 20, the degree of defocusing of the light beam is different in different working states, thereby achieving the switching between the first state and the second state to realize the functions of supplementary lighting and weeding respectively. Thus, the functions of supplementary lighting and weeding are integrated into the same light-emitting device, which can reduce the overall cost of the equipment and improve the efficiency of operation.

[0029] For details, please refer to Figure 1 , Figure 1The first state is the supplementary lighting state. In this state, the light beam emitted by the focusing component 20 includes either a non-converging beam or a converging beam. The non-converging beam includes diffused beams and parallel beams. When these two types of beams reach the target plant 30, the beam has a large spot size and weak intensity, thus providing supplementary lighting to the target plant 30. Furthermore, when the light beam emitted by the focusing component 20 is a converging beam, the first convergence point 40 of the converging beam is farther from the target plant 30, which also results in a large spot size and weak intensity, thus providing supplementary lighting to the target plant 30.

[0030] It should be noted that, Figure 1 The light beam emitted by the focusing assembly 20 is a parallel beam, but this application is not limited to this. In the embodiments of this application, the light beam emitted by the focusing assembly 20 can be a parallel beam, a diffused beam, or a converging beam. When the light beam emitted by the focusing assembly 20 is a converging beam, the first convergence point 40 can be formed between the target plant 30 and the focusing assembly 20, or it can be formed on the side of the target plant 30 away from the focusing assembly 20. (See reference...) Figure 5 , Figure 5 The first convergence point 40 is formed between the target plant 30 and the focusing component 20.

[0031] Please refer to Figure 2 , Figure 2 The second state is the weeding state. In the second state, the beam emitted by the focusing component 20 is in a converging state. The second convergence point 50 of the beam is closer to the target plant 30, which is closer to the focused state. The beam has a smaller spot size, which is smaller than the spot size in the first state. Compared with the first state, the light intensity reaching the target plant 30 is stronger. Therefore, the heat generated by the beam can be used to damage specific tissues of the target plant 30, thereby achieving the effect of removing weeds or inhibiting weed growth.

[0032] Please refer to Figures 5-6 , Figure 5 To provide supplemental lighting, the first convergence point 40 is further away from the target plant 30. Figure 6 In the weeding state, the second convergence point 50 is closer to the target plant 30.

[0033] It should be noted that the embodiments of this application reference... Figures 1-6 In all of them, the mechanical structure of the light-emitting device, such as the outer casing and internal fixing structure, is omitted. Figures 1-6 In the diagram, the lines connecting the light source 10, the steering component 60, the focusing component 20, and the target plant 30 are the light path diagram lines, which are used to intuitively understand the light path state within the light-emitting device. They are not physical structures.

[0034] Optionally, the target plant 30 may include whole plants such as flowers, crops, and weeds, or it may be an individual organ of a plant, such as the green leaves of a flower. In the first state, supplemental lighting is provided to plants that require light, such as flowers and leaves or crops, to promote photosynthesis; in the second state, strong light is provided to weeds or other plants that need to have their growth suppressed, to destroy the cell structure of the plant or inhibit cell growth, thereby achieving weed control.

[0035] It should be noted that the distance between the convergence point and the target plant 30 in this embodiment refers to the center of the target plant 30, as the target plant 30 may have a large volume. For example, the distance between the first convergence point 40 and the target plant 30 is the distance between the center of the first convergence point 40 and the target plant 30; similarly, the distance between the second convergence point 50 and the target plant 30 is the distance between the center of the second convergence point 50 and the target plant 30.

[0036] In some embodiments, please refer to Figure 3 The light source 10 includes a first light source 11 and a second light source 12.

[0037] The first light source 11 is used to emit a light beam of a first wavelength; the second light source 12 is used to emit a light beam of a second wavelength.

[0038] In the second state, both the first light source 11 and the second light source 12 emit light, and the second convergence point 50 includes a first sub-convergence point 51 through which the light beam of the first wavelength passes the focusing assembly 20 and a second sub-convergence point 52 through which the light beam of the second wavelength passes the focusing assembly 20; the distance between the first sub-convergence point 51 and the second sub-convergence point 52 and the target plant 30 does not exceed 10 mm.

[0039] In this embodiment, the two light sources 10 emit light of different wavelengths. By switching between the first and second focusing states of the focusing component 20, at least one wavelength of light can be used for supplementary lighting, and dual-wavelength synergistic weeding can be achieved, thereby improving the accuracy and thoroughness of weeding operations.

[0040] In the second state, both light sources 10 emit light, and the two wavelengths of light beams act simultaneously on the target plant 30. This combined effect has a detrimental impact on the target plant 30's growth, accelerating weed control efficiency. For example, the first wavelength of light beam can act on the chlorophyll in the leaves, causing it to lose its photosynthetic capacity. The second wavelength of light beam can generate significant heat, acting on the root and stem vascular tissue, blocking water and nutrient transport, thereby preventing weed regeneration. Therefore, the dual-wavelength light beam can act on different locations of the target plant 30, damaging it while also reducing the plant's chances of recovery, achieving deep weed control. It should be noted that this embodiment uses the first wavelength of light beam acting on chlorophyll and the second wavelength of light beam acting on the root and stem vascular tissue as an example. However, this does not mean that the first wavelength of light beam can only act on chlorophyll, nor does it mean that the second wavelength of light beam can only act on the root and stem vascular tissue. That is, the first wavelength of light beam can also act on the root and stem vascular tissue, and the second wavelength of light beam can also act on the leaves.

[0041] Considering that the closer the convergence point of the light beam is to the target plant 30, the stronger its influence, the distance between the first wavelength light beam and the target plant 30 through the first sub-convergence point 51 of the focusing assembly 20 does not exceed 10mm, thus ensuring the destructive power of the first wavelength light beam; the distance between the second wavelength light beam and the target plant 30 through the second sub-convergence point 52 of the focusing assembly 20 does not exceed 10mm, thus ensuring the destructive power of the second wavelength light beam.

[0042] Optionally, the distance between the target plant 30 and each convergence point in this embodiment is also the distance between the center of the target plant 30 and each convergence point.

[0043] Optionally, considering the different points of action of the first and second wavelength beams, the target plant 30 may include the leaves and roots of the target plant 30. In the second state, the distance between the first sub-converging point 51 and the second sub-converging point 52 and the target plant 30 does not exceed 10mm, the light spot can cover the leaves or roots, and the light-emitting device can be moved as needed to adjust the size of the light spot to achieve weeding of the leaves or roots.

[0044] Furthermore, the target plant 30 can vary depending on the state of the light-emitting device and the wavelength. For example, under the first wavelength, the target plant 30 is the leaf of the target plant 30, and the light beam is focused on the leaf. Under the second wavelength, the target plant 30 is the root and stem of the target plant 30, and the light beam is focused on the root and stem that needs to be destroyed.

[0045] In some embodiments, the light source 10 further includes a third light source for emitting a beam of light at a designed wavelength; the designed wavelength is less than a second wavelength but greater than a first wavelength, and the difference between the designed wavelength and the first wavelength is less than the difference between the designed wavelength and the second wavelength.

[0046] In the second state, the target plant 30 is located between the first sub-convergence point 51 and the second sub-convergence point 52, and the beam of the designed wavelength is converged at the target plant 30 by the focusing component 20.

[0047] In this embodiment, please refer to Figure 4 In the case of dual-wavelength beam weeding, the convergence points of the dual-wavelength beams (i.e., the first sub-convergence point 51 and the second sub-convergence point 52) ​​are located at both ends of the target plant 30. The design wavelength is closer to the value of the first wavelength, and the convergence point of the beam at the design wavelength falls on the target plant 30, so that both the first sub-convergence point 51 and the second sub-convergence point 52 provide strong illumination to the target plant 30. For example, if the first wavelength is 450nm and the second wavelength is 1470nm, then the wavelength in the middle is 960nm, and the design wavelength, which is closer to 450nm, can be 880nm.

[0048] The specific reason is that the focusing component 20 is a lens or lens group. It is difficult for the same focusing component 20 to simultaneously ensure that the refractive index of the first wavelength and the second wavelength beams are consistent. Considering that the degree of change of refractive index varies with different wavelengths when the focusing component 20 remains unchanged, when the first wavelength is shorter than the second wavelength, the difference in refractive index between the first wavelength beam and the beam at the midpoint wavelength is large, while the difference in refractive index between the second wavelength beam and the beam at the midpoint wavelength is small. Therefore, selecting a design wavelength closer to the first wavelength can make the difference in refractive index between the first wavelength beam and the beam at the midpoint wavelength, and the difference in refractive index between the second wavelength beam and the beam at the midpoint wavelength, closer and smaller. This allows the first wavelength beam and the second wavelength beam to converge as close as possible to the target plant 30 after passing through the focusing component 20, so that both wavelengths of light can give the target plant 30 greater energy, thereby achieving weed control.

[0049] For example, the same focusing component 20 cannot simultaneously guarantee consistent refractive indices for 450nm and 1470nm light beams. The refractive index difference between a 960nm and 450nm light beam is significant, while the difference between a 960nm and 1470nm light beam is smaller. Therefore, a design wavelength closer to 450nm, such as 880nm, is chosen. This designed wavelength allows the focusing component 20 to focus the light beam. By keeping the focusing component 20 unchanged, the difference in refractive indices between the 450nm and 1470nm light beams can be minimized, thus bringing their convergence points as close as possible to the target plant 30.

[0050] In other words, lenses are made of many different materials, each with a different refractive index for different wavelengths. This application can design the focusing assembly 20 by listing the refractive indices of different materials for multiple wavelengths between the first and second wavelengths when designing the lens material of the focusing assembly 20, and selecting the lens material with the smallest difference between the refractive indices of the first and second wavelengths. This ensures that the beams of the first and second wavelengths can converge as close as possible to the target plant 30 after passing through the focusing assembly 20.

[0051] Optionally, the focusing assembly 20 includes a lens made of calcium fluoride.

[0052] This application provides the refractive indices of lenses made of various materials for light beams of different wavelengths, as shown in Table 1.

[0053] Table 1. Refractive index of different materials for different wavelengths of light.

[0054] Among them, Fused Silica is high-purity silicon dioxide, BK7 is crown optical glass, N-LAK22 is high-refractive-index crown glass, CaF2 is calcium fluoride crystal material, and F2 is flint optical glass. In the design stage of this application embodiment, based on the requirement of a fixed focal length of 100nm for an 880nm beam, the curvature radius of different materials was designed to obtain the lens, and the focal length difference between 450nm and 1470nm based on this lens was calculated to be 3.27. The focal length difference of other materials is relatively large (see Table 2). Therefore, calcium fluoride was selected as the lens material of the focusing component 20, so that the first convergence point 40 and the second convergence point 50 are closer together, so that the first convergence point 40 and the second convergence point 50 are as close as possible to the target plant 30, thereby achieving weed control.

[0055] Table 2. Focal length differences of different materials

[0056] In some embodiments, the focusing component 20 is movable along its own optical axis to ensure that, in the second state, the first sub-convergence point 51 is located at the target plant 30 for a portion of the time, and the second sub-convergence point 52 is located at the target plant 30 for another portion of the time.

[0057] In this embodiment, the focusing component 20 is movable to achieve focusing. For a period of time, the first sub-converging point 51 is located at the target plant 30, causing the first wavelength beam to be focused at the target plant 30. For another period of time, the second sub-converging point 52 is located at the target plant 30, causing the second wavelength beam to be focused at the target plant 30. Specifically, there are two scenarios: one is that the focusing component 20 itself moves as a whole along its own optical axis; the other is that the focusing component 20 is composed of multiple lenses, and the spacing between the lenses can be changed.

[0058] Specifically, in the first case, the focal length of the beam is fixed after passing through the focusing component 20. By moving the focusing component 20, the position of the beam is changed so that the convergence point of the beam passing through the focusing component 20 is as close as possible to the target plant 30, thereby achieving weed removal.

[0059] In the second case, the spacing between the lenses inside the focusing assembly 20 is adjustable, thereby changing the focal length of the beam as it passes through the focusing assembly 20 and changing the convergence point, so that the convergence point is as close as possible to the target plant 30, thus achieving weed removal.

[0060] Optionally, a period of time may include half of a minute, and another period of time may include the other half of a minute, that is, in each minute, the first wavelength beam can be focused on the target plant 30 for half the time, and the second wavelength beam can be focused on the target plant 30 for the other half of the time.

[0061] It should be noted that the embodiments of this application involve two levels of focusing operation. The first level of focusing operation is achieved by changing the position state of the focusing component 20 and switching between the first state and the second state, respectively, to achieve supplemental lighting and weeding. The second level is achieved by changing the position state of the focusing component 20 in the case of dual wavelengths, so that the first wavelength beam is focused on the target plant 30 and the second wavelength beam is focused on the target plant 30.

[0062] In some embodiments, such as Figures 1-3 As shown, the focusing assembly 20 includes a first lens 21 and a second lens 22 arranged sequentially along the light output direction of the focusing assembly 20.

[0063] The first lens 21 and / or the second lens 22 are movable along the light output direction of the focusing assembly 20.

[0064] In this embodiment, the focusing assembly 20 consists of a pair of lenses. The focusing operation is achieved by moving the first lens 21, moving the second lens 22, or moving the first lens 21 and the second lens 22 together, thereby realizing the switching between the first state and the second state. It can also realize the switching of the focusing degree of different wavelengths in the case of dual wavelengths.

[0065] In some embodiments, such as Figures 5-6 As shown, the focusing assembly 20 includes: a first reflector 23, a second reflector 24, a third reflector 25, and a fourth reflector 26.

[0066] The first reflector 23 is tilted in the light-emitting direction of the light source 10; the second reflector 24 is positioned in the light-emitting direction of the first reflector 23 and is parallel to the first reflector 23; the third reflector 25 is tilted in the light-emitting direction of the second reflector 24 and is symmetrically positioned to the second reflector 24; the second reflector 24 and the third reflector 25 form a first reflector pair; the fourth reflector 26 is positioned in the light-emitting direction of the third reflector 25 and is parallel to the third reflector 25; the first reflector 23 and the fourth reflector 26 form a second reflector pair.

[0067] The light-incident direction of the first reflector 23 is collinear with the light-outceasing direction of the fourth reflector 26, and the distance between the first reflector pair and the second reflector pair is adjustable.

[0068] In this embodiment, the first and second pairs of reflectors are spaced apart in the optical path, ensuring that the optical axis direction of the light beam passing through the focusing assembly remains unchanged. Focusing is achieved by adjusting the spacing between the two pairs of reflectors. Specifically, the light-incident surface of the first reflector 23 serves as the light-incident surface of the focusing assembly 20, and the light-exiting surface of the fourth reflector 26 serves as the light-exiting surface of the focusing assembly 20. The positions of the first reflector 23 and the fourth reflector 26 are fixed, ensuring that the light-incident and light-exiting directions of the focusing assembly 20 remain consistent. This guarantees that the optical axis direction of the light beam remains unchanged before and after passing through the focusing assembly 20, simplifying the design and reducing costs.

[0069] Optionally, all reflectors have the same tilt angle. The first reflector 23 and the second reflector 24 are arranged parallel to each other along the first direction, and the third reflector 25 and the fourth reflector 26 are tilted along the first direction. The first reflector 23 and the fourth reflector 26 are symmetrically arranged about the first direction, and the line connecting their centers is parallel to the second direction. The second reflector 24 and the third reflector 25 are symmetrically arranged about the first direction, and the line connecting their centers is parallel to the second direction. The first direction is perpendicular to the second direction, and the second direction is parallel to both the light-emitting direction and the light-receiving direction of the focusing assembly 20.

[0070] Please refer to Figure 5 , Figure 5 To provide supplemental lighting, the first convergence point 40 is further away from the target plant 30. Figure 6 In the weeding state, the second convergence point 50 is closer to the target plant 30.

[0071] In some embodiments, in a first state, the first light source 11 emits light; the first wavelength is not less than 425nm and not greater than 475nm, and the second wavelength is not less than 1445nm and not greater than 1495nm.

[0072] In this embodiment, only the first light source 11 emits light under supplemental lighting conditions. The first wavelength is between 425nm and 475nm, belonging to the blue light band, which is beneficial for promoting photosynthesis. The second wavelength is between 1445nm and 1495nm, belonging to the near-infrared band, which is more effective in damaging plant tissues and achieving weed control. Furthermore, the first wavelength can also act on the leaf surface. When the first wavelength beam has ultra-high power, the laser beam surges in instantaneously, causing the chlorophyll's absorption capacity to exceed its own tolerance, thereby damaging the chlorophyll itself and disrupting photosynthesis. Combined with the second wavelength damaging the vascular tissue, this achieves synergistic weed control using dual wavelengths.

[0073] In some embodiments, the light-emitting device also includes a steering component 60.

[0074] The steering assembly 60 is disposed between the light source 10 and the focusing assembly 20; the light-emitting end of the steering assembly 60 is fixedly connected to the light-incident end of the focusing assembly 20; the steering assembly 60 includes at least one fifth reflector 61 and a rotating mechanism, the light-incident surface of the fifth reflector 61 has an angle with the light-emitting direction of the light source 10, and the rotating mechanism is rotatably connected to the fifth reflector 61, so that the angle between the fifth reflector 61 and the light-emitting direction of the light source 10 is adjustable.

[0075] Considering that the position of the target plant 30 may change, this embodiment changes the direction of the light path by using the steering component 60 to adapt to the position of the target plant 30 and improve the accuracy of supplemental lighting or weeding.

[0076] In this embodiment, the steering component 60 includes at least one fifth reflector 61, which can change the direction of the light path. The light-emitting end of the steering component 60 is fixedly connected to the light-incident end of the focusing component 20, so that the light-emitting end of the steering component 60 is always optically coupled with the focusing component 20, thereby allowing the turned light beam to enter the focusing component 20 and illuminate the target plant 30 after focusing.

[0077] Optionally, the steering assembly 60 includes three fifth reflectors 61. The first fifth reflector 61 is tilted relative to the light emission direction of the light source 10, and the light beam is directed to a direction perpendicular to the incident light direction. The beam reaches the second fifth reflector 61 and is then reflected perpendicular to the incident light direction. The beam reaches the surface of the third fifth reflector 61 and is then reflected perpendicular to the incident light direction. Ultimately, the incident light direction and the light emission direction of the steering assembly 60 have a certain angle.

[0078] Optionally, the light source 10 of this application includes a semiconductor laser.

[0079] Based on the same inventive concept, this application provides a method for supplemental lighting and weed control using a light-emitting device provided in any of the above embodiments. A flowchart of this method is shown below. Figure 7 As shown, the method includes steps S101 to S103: S101: Control at least one light source 10 to emit a light beam of at least one wavelength.

[0080] S102: Control the light-emitting device to be in the first state, so that the light beam emitted by the focusing component 20 includes a non-converging light beam or a converging light beam that converges to the first convergence point 40, for supplementing the target plant 30 with light.

[0081] S103: Control the light-emitting device to be in the second state, so that the light beam emitted by the focusing component 20 includes a converging light beam that converges at the second convergence point 50, which is used to destroy the target plant 30; the distance between the second convergence point 50 and the target plant 30 is smaller than the distance between the first convergence point 40 and the target plant 30 when the light beam emitted by the focusing component 20 in the first state includes a converging light beam.

[0082] In this embodiment, the light-emitting device provided in any of the foregoing embodiments is used, and its technical principle and effect are similar, so they will not be described again here. In this embodiment, by adjusting the working state of the light-emitting device and adjusting the focusing component 20, the degree of defocusing of the beam is different in different working states, realizing the switching between the first state and the second state, so as to realize the functions of supplemental lighting and weeding respectively. Thus, the functions of supplemental lighting and weeding are integrated into the same light-emitting device, which can reduce the overall cost of the equipment and improve the efficiency of operation.

[0083] In some embodiments, step S103 above, controlling the light-emitting device to be in the second state, includes the following steps: The first light source 11 and the second light source 12 of the control light source 10 emit light, and the control focusing component 20 moves along its own optical axis, so that in the second state, the first sub-convergence point 51 is located at the target plant 30 for a part of the time, and the second sub-convergence point 52 is located at the target plant 30 for another part of the time.

[0084] In this embodiment, controlling the light-emitting device to be in either the first or second state specifically includes controlling the on / off state of the light source 10 and controlling the position and movement state of the focusing component 20. Controlling the second state specifically includes: controlling both the first light source 11 and the second light source 12 to emit light, and controlling the focusing component 20 to move along its own optical axis, so that the light beams of the first and second wavelengths, after passing through the focusing component 20, can make their respective convergence points as close as possible to the target plant 30.

[0085] In step S102 above, controlling the light-emitting device to be in the first state includes: turning off the second light source 12 and controlling the position of the focusing assembly 20.

[0086] In this embodiment, controlling the light-emitting device to be in the first state includes turning off the second light source 12, keeping the first light source 11 emitting light normally, and adjusting the position of the focusing component 20 so that the light beam of the first wavelength emits a divergent beam, a parallel beam, or a converging beam with a convergence point far away from the target plant 30 after passing through the focusing component 20, thereby achieving supplemental lighting.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light-emitting device, characterized in that, include: At least one light source (10), each of the light sources (10) being used to emit a light beam of a certain wavelength; The focusing assembly (20) is located on the light-emitting side of the light source (10) and is used to guide the light beam emitted by the light source (10) to the target plant (30). The light-emitting device has at least two states; in the first state, the light beam emitted by the focusing component (20) includes a non-converging light beam or a converging light beam converging at a first convergence point (40), which is used to supplement the light of the target plant (30); In the second state, the light beam emitted by the focusing component (20) includes a converging light beam that converges at a second convergence point (50) to destroy the target plant (30); the distance between the second convergence point (50) and the target plant (30) is smaller than the distance between the first convergence point (40) and the target plant (30) when the light beam emitted by the focusing component (20) in the first state includes a converging light beam.

2. The light-emitting device according to claim 1, characterized in that, The light source (10) includes: A first light source (11) is used to emit a beam of light of a first wavelength; The second light source (12) is used to emit a beam of light of a second wavelength; In the second state, both the first light source (11) and the second light source (12) emit light, and the second convergence point (50) includes a first sub-convergence point (51) through which the light beam of the first wavelength passes the focusing component (20) and a second sub-convergence point (52) through which the light beam of the second wavelength passes the focusing component (20); the distance between the first sub-convergence point (51) and the second sub-convergence point (52) and the target plant (30) does not exceed 10 mm.

3. The light-emitting device according to claim 2, characterized in that, The light source (10) further includes: a third light source for emitting a light beam of a designed wavelength; the designed wavelength is less than the second wavelength and greater than the first wavelength, and the difference between the designed wavelength and the first wavelength is less than the difference between the designed wavelength and the second wavelength; In the second state, the target plant (30) is located between the first sub-convergence point (51) and the second sub-convergence point (52), and the beam of the designed wavelength is focused on the target plant (30) by the focusing assembly (20).

4. The light-emitting device according to claim 2, characterized in that, The focusing component (20) is movable along its own optical axis and is used to ensure that, in the second state, the first sub-convergence point (51) is located at the target plant (30) for a portion of the time, and the second sub-convergence point (52) is located at the target plant (30) for another portion of the time.

5. The light-emitting device according to claim 2, characterized in that, The focusing assembly (20) includes a first lens (21) and a second lens (22) arranged sequentially along the light output direction of the focusing assembly (20). The first lens (21) and / or the second lens (22) are movable along the light output direction of the focusing assembly (20).

6. The light-emitting device according to claim 2, characterized in that, The focusing assembly (20) includes: The first reflecting mirror (23) is tilted in the light-emitting direction of the light source (10); The second reflector (24) is disposed in the light-emitting direction of the first reflector (23) and is parallel to the first reflector (23); The third reflector (25) is inclined and arranged in the light-emitting direction of the second reflector (24) and symmetrically arranged with respect to the second reflector (24); the second reflector (24) and the third reflector (25) form a first reflector pair; The fourth reflector (26) is disposed in the light-emitting direction of the third reflector (25) and is parallel to the third reflector (25); the first reflector (23) and the fourth reflector (26) form a second reflector pair; The light-incident direction of the first reflector (23) is collinear with the light-outcident direction of the fourth reflector (26), and the distance between the first reflector pair and the second reflector pair is adjustable.

7. The light-emitting device according to claim 2, characterized in that, In the first state, the first light source (11) emits light; The first wavelength is not less than 425nm and not greater than 475nm, and the second wavelength is not less than 1445nm and not greater than 1495nm.

8. The light-emitting device according to claim 1, characterized in that, The light-emitting device also includes: A steering component (60) is disposed between the light source (10) and the focusing component (20); the light-emitting end of the steering component (60) is fixedly connected to the light-incident end of the focusing component (20); The steering assembly (60) includes at least one fifth reflector (61) and a rotating mechanism. The light-incident surface of the fifth reflector (61) has an angle with the light-out direction of the light source (10). The rotating mechanism is rotatably connected to the fifth reflector (61), so that the angle between the fifth reflector (61) and the light-out direction of the light source (10) is adjustable.

9. A method for supplemental lighting and weed control based on the light-emitting device according to any one of claims 1-8, characterized in that, include: Control at least one of the light sources (10) to emit light beams of at least one wavelength; The light-emitting device is controlled to be in the first state, so that the light beam emitted by the focusing component (20) includes a non-converging light beam or a convergent light beam that converges to the first convergence point (40), for supplementing the target plant (30) with light. The light-emitting device is controlled to be in a second state, such that the light beam emitted by the focusing component (20) includes a converging light beam that converges at a second convergence point (50) to destroy the target plant (30); the distance between the second convergence point (50) and the target plant (30) is smaller than the distance between the first convergence point (40) and the target plant (30) when the light beam emitted by the focusing component (20) in the first state includes a converging light beam.

10. The supplemental lighting weed control method according to claim 9, characterized in that, Controlling the light-emitting device to be in the second state includes: The first light source (11) and the second light source (12) of the light source (10) are controlled to emit light, and the focusing component (20) is controlled to move along its own optical axis, so that in the second state, the first sub-convergence point (51) is located at the target plant (30) for a part of the time, and the second sub-convergence point (52) is located at the target plant (30) for another part of the time. In addition, controlling the light-emitting device to be in a first state includes: turning off the second light source (12) and controlling the adjustment of the position of the focusing component (20).

Images