Rotating-mirror plant grow light

Abstract

A rotating-mirror plant grow light, comprising: a light source (10), a drive motor (20), and a multi-beam rotating mirror (32). The light source (10) is disposed near a plurality of focal points of the multi-beam rotating mirror (32), and the drive motor (20) is connected to the multi-beam rotating mirror (32). During operation, the drive motor (20) drives the multi-beam rotating mirror (32) to rotate, and light emitted by the light source (10) is reflected and / or refracted by the multi-beam rotating mirror (32) to form a plurality of rotating light beams, so that scanning illumination is performed on an illuminated object. The illuminated object is a light guide device or a photoautotrophic organism. The rotating-mirror plant grow light converts a continuously emitting light source into a scanning light source, and provides pulsed illumination for plant supplemental lighting, thereby improving the light energy utilization rate of plant photosynthesis and reducing energy consumption costs of supplemental lighting.

Description

A rotating mirror plant fill light Technical Field

[0001] The present invention relates to the field of agricultural plant supplementary lighting, and in particular to a rotating mirror plant supplementary lighting. Background Art

[0002] Agricultural supplemental lighting technology has been gaining popularity in countries like the Netherlands since the 1960s. During periods of insufficient sunlight in winter and spring, during rainy weather, and at night, artificial light supplementation for greenhouse crops can effectively promote plant growth, increase yields, and boost economic returns. Common plant supplemental lighting fixtures in modern agriculture include agricultural high-pressure sodium lamps, metal halide lamps, and LEDs. Agricultural high-pressure sodium lamps offer advantages such as high luminous efficiency, high power per light source, and low equipment cost, making them suitable for supplemental lighting in open greenhouses. LEDs offer the advantages of a controllable spectrum and the ability to provide close-range illumination without burning plants. They are suitable as primary lighting sources in compact vertical farms or for inter-plant supplemental lighting of tall plants like tomatoes in greenhouses.

[0003] Agricultural supplemental lighting requires light intensity exceeding the photosynthesis compensation point for plants to accumulate organic matter and promote growth. Within a certain range, the intensity of artificial light supplementation is directly proportional to plant growth rate. However, in addition to the high initial investment in supplemental lighting equipment, agricultural supplemental lighting also carries high energy costs during its daily operation. For example, the electricity costs of agricultural high-pressure sodium lamps over a year of normal operation approach or even exceed the initial equipment costs of the supplemental lighting. For equivalent supplemental lighting requirements, the initial equipment costs of LED supplemental lighting are approximately five times higher than those of agricultural high-pressure sodium lamps, while the difference in energy consumption is not significant. Therefore, agricultural high-pressure sodium lamps are currently the primary solution for supplemental lighting in agriculture. Because supplemental lighting significantly increases agricultural production costs, it is currently only used in greenhouses where high-value crops are grown. This high cost limits its application.

[0004] Photosynthesis consists of two interdependent reaction phases: the light reaction and the dark reaction. The light energy absorbed by the brief light reaction requires the longer dark reaction to produce organic matter. The light reaction is at least an order of magnitude faster than the dark reaction. Therefore, under continuous light conditions, most of the light energy is not utilized by plants, but is dissipated as fluorescence and heat. This is the main reason for low photosynthesis efficiency. If pulsed light is provided to plants for supplemental illumination, plants will achieve higher light energy utilization efficiency for photosynthesis under pulsed light conditions than under continuous light conditions, given the same total light energy input.

[0005] The plant supplementary lighting commonly used in existing greenhouses provides supplementary lighting in the form of continuous light, which has the problems of low light energy utilization, high light source power per unit area, and high energy consumption cost.

[0006] To achieve pulsed light supplementary lighting, many research teams have explored the use of LED pulsed light as a plant supplementary light for many years, such as the technical solutions disclosed in patents such as CN110856316 and CN106538257. Although LED pulsed light cultivation has achieved the goal of increasing plant light energy utilization and reducing energy consumption costs, it has the problem of more complex driving circuits and higher equipment costs, which offsets the advantage of energy savings. In addition, under the premise of the same supplementary lighting area and plant growth effect, the rated power of LED supplementary light for pulsed light and LED for continuous lighting is the same, but the pulsed light is emitted in a light-alternating manner with lower average power. The rated power of LED light sources is proportional to the price, so pulsed light LED supplementary light cannot reduce the cost of LED light sources.

[0007] In addition to allowing the light source to directly emit pulsed light to illuminate the plants, the method of pulsed light supplementation can also be to allow the continuous light source to provide pulsed light illumination to the plants through mechanical motion scanning lighting.

[0008] The technical solution disclosed in patent CN 102318522 is to fix the light source on a trolley that travels back and forth on a guide rail above the planting rack. As the trolley moves, the range of illumination of the fixed light source also moves, providing scanning illumination between different planting areas. However, the disadvantage is that it can only achieve low-frequency pulsed light illumination, which is not very effective in improving light energy utilization.

[0009] Japanese patent JPA 2016077264 discloses a solution for using laser scanning technology for plant supplemental lighting. However, this solution has the disadvantages of being applicable only to point-shaped laser light sources and the high cost of laser equipment.

[0010] Patent CN 201911209799.4, filed by the applicant in 2019, discloses a plant supplemental lighting solution. Wide-angle light emitted by an artificial light source is focused by a spotlight into a nearly parallel beam. This nearly parallel beam is then reflected by a moving multi-faceted mirror / galvanometer mirror and converted into a scanning beam, which illuminates the plants in a scanning manner, providing pulsed light illumination. However, this solution suffers from the inability to simultaneously convert the wide-angle light emitted by the artificial light source into multiple scanning beams. Summary of the Invention

[0011] Based on the above-mentioned defects of the prior art, the present invention intends to provide a new type of plant fill light lamp, which can convert the large-angle light emitted by a continuously luminous artificial light source into multiple scanning light beams, so that plants can obtain pulsed light illumination, improve the light energy utilization rate of photosynthesis, and save fill light energy consumption.

[0012] In order to solve the above technical problems, the present invention provides a rotating mirror plant fill light, comprising: a light source, a driving motor and a multi-beam rotating mirror; the light source is arranged near multiple focal points of the multi-beam rotating mirror, and the driving motor is connected to the multi-beam rotating mirror; when working, the driving motor drives the multi-beam rotating mirror to rotate, and the light emitted by the light source is reflected and / or refracted by the multi-beam rotating mirror to form multiple rotating light beams to perform scanning illumination on the object to be illuminated, and the object to be illuminated is a light guiding device or a photosynthetic autotrophic organism.

[0013] The present invention realizes the conversion of large-angle light emitted by a continuously luminous artificial light source into multiple scanning light beams to perform scanning illumination on an illuminated object, so that the illuminated object obtains pulsed light illumination.

[0014] Compared with the comparative solution of application number CN201911209799.4, the functional differences of the present invention are: 1. forming multiple scanning beams at the same time, 2. no device is required to convert into a nearly parallel beam before forming the scanning beam, 3. a larger scanning lighting angle can be achieved, and 4. during operation, the angle of the moving optical surface relative to the light source remains unchanged.

[0015] Compared with the technical solution of patent CN 102318522, the present invention can easily achieve a scanning frequency of more than 100 Hz. The moving parts are the drive motor and the multi-beam rotating mirror. Compared with the solution in which the entire trolley is the moving part, the energy consumption is lower.

[0016] Compared with the technical solution of Japanese patent JPA 2016077264, the present invention is suitable for common agricultural supplementary lighting sources such as agricultural high-pressure sodium lamps and LED lamps. The light source cost is lower and the spectrum is more suitable for plant growth requirements.

[0017] A search revealed no other similar technical solutions in the field of agricultural supplemental lighting. In the field of navigation, the optical principles of lighthouses and mechanical flashing siren lights are similar to the optical structure of the present invention, but these differ in their technical fields, solve different technical problems, and illuminate different objects, and therefore do not constitute conflicting technical solutions.

[0018] The light source may be a gas discharge light source, an incandescent lamp, an LED, etc. Depending on the type of light source, the light source may be powered by a ballast, an electronic ballast, a constant current drive circuit, or a pulse drive circuit.

[0019] The driving motor can be an AC motor, a DC motor, a brushed motor, a brushless motor, a hollow motor, an outer rotor motor, etc. The rotor of the driving motor can be directly connected to the edge or rotating shaft of the multi-beam rotating mirror, or it can be indirectly connected. The rotor of the motor is connected to the multi-beam rotating mirror through a transmission device or a speed change device such as a coupling, a magnetic coupling or a gear belt.

[0020] A multi-beam rotating mirror converts light from a light source into multiple beams. It consists of multiple focusing devices arranged around a rotation axis, with their focal points facing the light source. Light from the light source passes through the multi-beam rotating mirror and is converged by the multiple focusing devices into multiple beams, which are then directed outward along their respective optical axes. As the multi-beam rotating mirror rotates, the multiple beams rotate simultaneously, achieving scanning illumination of the object being illuminated.

[0021] A light guide is an optical device that transmits light to photosynthetic autotrophic organisms through reflection, refraction, scattering, or total internal reflection for illumination. This light guide can be a light guide plate, with the light inlet facing a multi-beam rotating mirror and the light outlet facing the photosynthetic autotrophic organism. Alternatively, it can be a light pipe, combined reflector, or other device. Photosynthetic autotrophic organisms include microalgae, photosynthetic bacteria, protozoa with photosynthetic pigments, and plants.

[0022] Preferably, the light source is a type of light source that is more suitable for agricultural supplementary lighting, such as an agricultural high-pressure sodium lamp, a metal halide lamp, or an LED light source.

[0023] These light source types have achieved good agricultural lighting effects through long-term practice. The multi-beam rotating mirror of the present invention can convert this type of large-angle emitting light source into multiple scanning light beams.

[0024] Preferably, the multiple condenser lenses can be arranged on the same side of the light source, with the multiple focal points facing the light source or around the light source, or in the direction of the virtual image of the light source. The multiple condenser lenses can be arranged in a disc, ring, or bowl shape around the rotation axis, or arranged in one or more circles radially along the rotation axis. The condenser lenses can also be arranged around the light source, with the multiple focal points facing the rotation axis of the light source. The multiple condenser lenses can be arranged in a tubular or barrel shape around the rotation axis, or arranged in one or more circles axially along the rotation axis.

[0025] The focusing device can be a focusing lens, a focusing surface mirror, or a hybrid focusing device, and the focusing device realizes focusing by refraction and / or reflection. The focusing lens includes a convex lens, a convex cylindrical lens, a Fresnel lens, and a microlens array. Among them, the convex lens includes a convex aspheric mirror, a convex free-form surface lens and other types, and the Fresnel lens is equivalent to a convex lens and a convex cylindrical lens. The focusing surface mirror includes a spherical mirror and an aspheric mirror, among which the aspheric mirror includes a parabolic mirror, a free-form surface reflector and other types. The hybrid focusing device is composed of a focusing lens and a focusing surface mirror. The multi-beam rotating mirror composed of a focusing lens can also serve as a lampshade to protect the light source.

[0026] The focusing lens can be made of K9 glass, ultra-clear glass, quartz glass, acrylic, or other translucent materials. The multi-beam rotating mirror formed by the focusing lens can be manufactured using integral mold forming, hot bending welding, or injection molding. The inner and outer walls of the focusing lens have anti-reflection coatings to increase light transmittance. The inner wall can also have an infrared reflective coating to reflect infrared light from the gas discharge light source back to the source, further increasing luminous efficiency.

[0027] Preferably, the multi-beam rotating mirror is formed by combining a plurality of convex lenses and / or convex cylindrical lenses to form a dish shape, a tube shape or a barrel shape, and the plurality of convex lenses and / or convex cylindrical lenses are arranged in one or more circles around the rotation axis.

[0028] Preferably, the multi-beam rotating mirror is composed of an array of Fresnel lenses equivalent to multiple convex lenses and / or convex cylindrical lenses, the array of Fresnel lenses is dish-shaped, tubular or barrel-shaped, and the array of Fresnel lenses is arranged in one or more circles around the rotation axis.

[0029] The multi-beam rotating mirror designed with an array Fresnel lens can significantly reduce the materials required to make the multi-beam rotating mirror, reduce the weight and driving motor power, and also reduce the volume of the multi-beam rotating mirror.

[0030] Preferably, the sawtooth convex surface of the array Fresnel lens faces the light source.

[0031] The exposed serrated convex surface of the array Fresnel lens is fragile, easily contaminated by dust, and difficult to clean. Positioning the serrated convex surface inward, facing the light source, and the smooth surface outward, isolates the inside from the outside environment and makes it less susceptible to touch, while the smooth outside prevents dust from accumulating and makes it easier to clean. Furthermore, with the serrated convex surface facing the light source, internal reflection losses within the medium are reduced, resulting in less stray light.

[0032] Preferably, the sawtooth convex surface of the array Fresnel lens faces outwards away from the light source.

[0033] Preferably, the multi-beam rotating mirror is formed by combining a plurality of focusing mirrors into a pyramidal shape, a turbofan shape or a wind wheel shape, and the plurality of focusing mirrors are arranged in one or more circles around the rotation axis.

[0034] With the converging mirror solution, the light emitted by the light source only needs to be reflected once at least to obtain multiple scanning beams. With the existing material level, the reflection loss is significantly lower than the transmission loss of the converging lens, so the light energy loss is lower.

[0035] Preferably, the focusing mirror is a parabolic mirror, and the light emitted by the light source is reflected by a plurality of rotating parabolic mirrors to form a plurality of rotating light beams to perform scanning illumination on the object to be illuminated.

[0036] The focusing mirror can be made of a single piece of aluminum with a polished reflective surface. Alternatively, it can be made of a reflector base made of metal or composite material with a reflective surface. The reflective surface can be polished to a mirror surface using aluminum or silver, or a high-reflectivity material such as a dielectric film can be laminated to the reflector base.

[0037] Preferably, a reflective curved surface and / or lens with a fixed position relative to the light source should also be provided in the front light path and / or rear light path of the multi-beam rotating mirror, and its function is to change the light intensity distribution of the front light path and / or rear light path of the multi-beam rotating mirror.

[0038] The reflective curved surface and / or lens in the optical path in front of the multi-beam rotating mirror focuses light emitted by the light source at angles outside the range of the multi-beam rotating mirror into the range of the multi-beam rotating mirror through reflection and / or refraction, reducing light wasted at angles and ranges not required for illumination. The light intensity distribution of the light source at different illumination angles within the range of the multi-beam rotating mirror can also be controlled, achieving more uniform illumination of the illuminated plane of the object being illuminated. The reflective curved surface and / or lens in the optical path behind the multi-beam rotating mirror can correct the illumination angles of the multiple scanning beams generated by the multi-beam rotating mirror, changing the light intensity distribution at different illumination angles, varying the scanning illumination range, and forming multiple illumination zones. The lens in the optical path behind the multi-beam rotating mirror also functions as a lampshade.

[0039] The reflective curved surface may be a reflective lampshade, a reflective cup, a total reflection curved surface in a lens, etc. The lens may be an LED focusing lens, a collimating lens, an array microlens, a Fresnel lens, etc.

[0040] For gas discharge light sources that emit light at multiple angles, such as agricultural high-pressure sodium lamps, the reflective surface can be set on the side of the light source facing away from the illuminated object to reflect the light from the light source to the same side, thereby narrowing the light-emitting angle of the light source. It can also be set at both ends of the long axis of the light source to reflect the light irradiated in the long axis direction from the light source. The shape of the reflective surface can be a semi-circular tube, a dish, a bowl or other reflector shapes in the existing technology. It can also be a parabolic reflector, a reflective cup or a combination of a reflective cup and a focusing lens with the light source placed at the focus to converge the light from the light source to one side. For light sources such as LEDs, whose emission angle is generally within 180 degrees, the reflective surface and / or lens can be set in front of the light source to narrow the emission angle of the LED light source and change the light intensity distribution. The lens can contain a total reflection surface or an array of micro lenses.

[0041] Preferably, the multi-beam rotating mirror has a connecting end located at the edge or the rotating axis, the rotor of the driving motor is connected to the connecting end of the multi-beam rotating mirror and drives the multi-beam rotating mirror to rotate, and the stator of the driving motor is installed on the lamp holder or bracket.

[0042] The connection end is a structure or device located at the edge, periphery, or rotation axis of the multi-beam rotating mirror to facilitate connection to the motor. The bracket is used to fix multiple relatively stationary components or serve as a mounting bracket.

[0043] Preferably, the multi-beam rotating mirror has a connecting end located at the edge or the rotating axis, the driving motor is a hollow motor, the rotor of the hollow motor is connected to the connecting end of the multi-beam rotating mirror and drives the multi-beam rotating mirror to rotate, and the middle through hole of the hollow motor serves as a light hole or a light source wiring hole.

[0044] The middle through hole serving as the light source wiring hole can be sealed after assembly is completed to achieve dust and moisture-proof effects on the light source and the inner side of the multi-beam rotating mirror.

[0045] Preferably, the multi-beam rotating mirror and the light source are both in the same light-transmitting cover. The light-transmitting cover prevents the light source and the multi-beam rotating mirror from being exposed, plays a protective and dust-proof role, and is easier to clean.

[0046] The light shield is at least partially made of a transparent material to allow the scanning beam to illuminate the outside. The area where the scanning beam is not emitted can be made of a non-transparent material. The transparent material of the light shield can be glass, ultra-clear glass, quartz, optical glass, acrylic, etc.

[0047] Preferably, the multi-beam rotating mirror and the light source are both located in the same sealed light-transmitting cover, and the air pressure in the sealed light-transmitting cover is lower than atmospheric pressure or is filled with a gas with an average molecular weight lower than 28.

[0048] The sealed light-transmitting cover can be evacuated to create a low pressure or vacuum environment, or filled with a gas with a molecular weight lower than that of air, to reduce the air resistance during the operation of the multi-beam rotating mirror. The sealed light-transmitting cover can also be provided with a gas valve to achieve vacuuming or inflation operations.

[0049] Preferably, before the light source starts to emit light stably, the driving motor is started in advance to drive the multi-beam rotating mirror to rotate.

[0050] Preferably, after the light source is turned off, the drive motor continues to work for a period of time before stopping.

[0051] Preferably, the number of focusing devices constituting the multi-beam rotating mirror is greater than 3.

[0052] Preferably, in a cross section perpendicular to the rotation axis, the number of focusing devices constituting the multi-beam rotating mirror is less than 30.

[0053] Preferably, in a cross section perpendicular to the rotation axis, the number of focusing devices constituting the multi-beam rotating mirror is less than 16.

[0054] Preferably, the rotation speed of the multi-beam rotating mirror is greater than 1000 revolutions per minute.

[0055] Preferably, the rotation speed of the multi-beam rotating mirror is greater than 1800 revolutions per minute.

[0056] The area illuminated by the beams emitted by the multi-beam rotating mirror is the light zone, while the area between the beams is unlit or dimly illuminated, known as the dark zone. There are multiple light and dark zones. As the multi-beam rotating mirror rotates, the beams follow it, alternating between the light and dark zones. Both areas fall within the scanning illumination range. The number of times per second that an illuminated object at the same point is in the light zone and receives scanning illumination is the pulse frequency. The ratio of the time the illuminated object at the same point is in the light zone to the unit time is the duty cycle.

[0057] Preferably, within the scanning illumination range of the multi-beam rotating mirror, the pulse frequency of the scanning illumination obtained by the illuminated object at the same point is greater than 100 Hz.

[0058] Preferably, within the scanning illumination range of the multi-beam rotating mirror, the pulse frequency of the scanning illumination obtained by the illuminated object at the same point is greater than 300 Hz.

[0059] Preferably, within the scanning illumination range of the multi-beam rotating mirror, the duty cycle of the scanning illumination obtained by the illuminated object at the same point is less than 25%.

[0060] Similar existing optical applications in other fields, such as lighthouses and sirens, emit pulsed light at a lower frequency to facilitate human recognition. The rotating mirror plant light proposed in this invention aims to increase the efficiency of light energy used in photosynthesis, requiring a pulse frequency greater than 100Hz, exceeding the human eye's stroboscopic sensitivity of 24Hz.

[0061] According to different application requirements, there may also be supporting devices and technical means commonly used in this technical field, such as lamp holders, wiring devices, heat dissipation devices and switches.

[0062] BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a schematic diagram of a plant light that uses an agricultural high-pressure sodium lamp and a barrel-shaped lens with a multi-beam rotating mirror.

[0064] Figure 2 is a schematic diagram of a plant fill light with a parabolic reflector cup and a disk lens multi-beam rotating mirror.

[0065] Figure 3 is a schematic diagram of a plant light that uses an LED light source and a tubular array Fresnel lens with a multi-beam rotating mirror.

[0066] FIG4 is a cross-sectional schematic diagram of a plant light that includes an LED light source and a tubular array Fresnel lens with a multi-beam rotating mirror.

[0067] FIG5 is a cross-sectional schematic diagram of a plant light supplemented by an agricultural high-pressure sodium lamp and a wind wheel-shaped parabolic mirror and a multi-beam rotating mirror. Implementation Method Example

[0068] A plant light supplementary lighting system using an agricultural high-pressure sodium lamp and a barrel-shaped lens with a multi-beam rotating mirror. The system includes a ballast, a lamp holder 11, an agricultural high-pressure sodium lamp light source 10, a motor 20, a barrel-shaped lens with a multi-beam rotating mirror 32, and a bracket 23. As shown in Figure 1, the agricultural high-pressure sodium lamp light source 10 is fixed to the lamp holder 11 and powered by the ballast. The barrel-shaped lens with a multi-beam rotating mirror 32 consists of eight convex lenses arranged symmetrically around the center of the rotation axis. The focal length of the convex lenses is slightly smaller than the radius of the barrel-shaped lens with a multi-beam rotating mirror 32 cross section. The luminous ceramic tubes of the agricultural high-pressure sodium lamp light source 10 are located near the eight focal points of the barrel-shaped lens with a multi-beam rotating mirror 32. The motor 20 is connected to the bottom center of the barrel-shaped lens with a multi-beam rotating mirror 32 at the end away from the lamp holder, and is driven by the motor 20 to rotate. When working, the power supply is connected. The power supply includes a ballast for powering the agricultural high-pressure sodium lamp 10 and a drive circuit for powering the motor 20. The light emitted by the agricultural high-pressure sodium lamp 10 is refracted by the barrel-shaped lens multi-beam rotating mirror 32 to form 8 separate light beams to illuminate the outside. The light beams form rotating light beams as the barrel-shaped lens multi-beam rotating mirror 32 rotates, scanning the external illuminated object, and the illuminated object obtains alternating light and dark pulse light illumination.

[0069] A variation is that a reflective curved surface can be provided at both ends of the axial direction of the agricultural high-pressure sodium lamp light source 10. The reflective curved surface is a ring-shaped curved reflector, which reflects the light beams emitted by the agricultural high-pressure sodium lamp light source 10 to both ends of the axial direction that do not directly illuminate the optical curved surface of the barrel-shaped lens multi-beam rotating mirror 32 onto the optical curved surface of the barrel-shaped lens multi-beam rotating mirror 32.

[0070] There is another variation, in which the connection end of the barrel-shaped lens multi-beam rotating mirror 32 is near the end of the lamp holder 11, the driving motor is an annular hollow motor, the stator of the annular hollow motor is fixedly connected to the lamp holder, and the rotor is connected to the connection end of the barrel-shaped lens multi-beam rotating mirror 32. The end of the barrel-shaped lens multi-beam rotating mirror 32 away from the lamp holder is a blind end and is closed. Under this design, the bracket 23 can be eliminated. Example

[0071] A plant light supplementary lighting system employs a parabolic reflector cup and a disk-shaped lens multi-beam rotating mirror. The system comprises a lamp holder 11, a metal halide light source 10, a parabolic reflector cup 13, a hemispherical reflector cup 12, a ring-shaped hollow motor, and a disk-shaped lens multi-beam rotating mirror 30. As shown in FIG2 , the metal halide light source 10 is mounted on the lamp holder 11. The parabolic reflector cup 13 and the hemispherical reflector cup 12 serve as reflective curved surfaces. The metal halide light source 10 is positioned at the focal point of the parabolic reflector cup 13 and the hemispherical reflector cup 12. The hemispherical reflector cup 12 is positioned in a direction facing away from the metal halide light source 10 and facing away from the lamp holder 11. The parabolic reflector cup 13 and the hemispherical reflector cup 12 serve as reflective curved surfaces in the light path in front of the multi-beam rotating mirror. The disk-shaped lens multi-beam rotating mirror 30 is positioned at the opening of the parabolic reflector cup 13. The disk-shaped lens multi-beam rotating mirror 30 is composed of 12 convex cylindrical lenses spliced ​​together with their optical axes intersecting radially. The outer periphery of the disc-shaped lens multi-beam rotating mirror 30 serves as a connection end, connected to the rotor 22 of the annular hollow motor. The stator 21 of the annular hollow motor is fixedly mounted on the outer edge of the parabolic reflector 13. During operation, when a power source is connected to the annular hollow motor and the metal halide lamp 10, the disc-shaped lens multi-beam rotating mirror 30 rotates under the power of the annular hollow motor. Driven by the ballast, the metal halide lamp 10 emits light in multiple angles. After reflection from the parabolic reflector 13, or after reflection from both the hemispherical reflector 12 and the parabolic reflector 13, the light is transformed into a parallel beam or a small-angle beam, which then exits from the opening of the parabolic reflector. The light beam is refracted by the rotating disc-shaped lens multi-beam rotating mirror 30, forming a rotating radial light spot that provides scanning illumination of the object being illuminated. A small-angle beam refers to a beam with an emitting angle of less than 180 degrees. The disc-shaped multi-beam rotating mirror 30 can be replaced with a turbofan-shaped multi-beam rotating mirror composed of multiple parabolic mirrors. The light beam emitted from the parabolic reflector opening is reflected by the turbofan-shaped multi-beam rotating mirror to form a rotating radial light spot. The parabolic reflector 13 and the hemispherical reflector 12 can also be replaced with equivalent collimating lenses.

[0072] A variation, if the light source is a large-area LED light source that emits light uniformly at a large angle, then a reflective cup may not be needed or only a shallow reflective cup or lens is needed. The lens multi-beam rotating mirror is a bowl-shaped mirror with a protruding center. The edge of the bowl is connected to the rotor 22 of the annular hollow motor, and the stator 21 of the annular hollow motor is fixed on the plane where the LED substrate is located.

[0073] In another variation, the connection end of the disk-shaped lens multi-beam rotating mirror 30 is located inside or outside the rotation axis, the rotor of the drive motor is coaxially connected to the connection end, the stator of the drive motor is fixed to the parabolic reflector cup 13 of the lamp body via a bracket or truss, and the rotor at the center of the drive motor is fixed to the rotation axis of the disk-shaped lens multi-beam rotating mirror 30. The drive motor can also be set on a non-coaxial axis with the disk-shaped lens multi-beam rotating mirror 30, and the drive motor rotor drives the disk-shaped lens multi-beam rotating mirror 30 to rotate by means of a gear set or a transmission belt. Example

[0074] A plant light supplementary lighting system utilizes an LED light source in conjunction with a tubular array Fresnel lens multi-beam rotating mirror. As shown in Figures 3 and 4, the system comprises a drive circuit, a bracket 23, a hollow motor, a tubular array Fresnel lens multi-beam rotating mirror 31, a bearing 24, a light source substrate 14, a heat sink 15, an LED light source 16, and a collimating lens 17. The circuitry connecting the LED light source 16 and the hollow motor is located within the inner cavity of the bracket 23. One end of the bracket 23 is connected to the stator 21 of the hollow motor, and the other end is connected to the outer race of the bearing 24. The tubular array Fresnel lens multi-beam rotating mirror 31 has a connecting end at each end of the tube mouth, which connects to the rotor 22 of the hollow motor and the inner race of the bearing 24, respectively. Multiple LED light sources 16 are arranged in a row on the elongated light source substrate 14, with a collimating lens 17 positioned in front of each LED light source. The elongated light source substrate 14 extends into the cavity of the tubular array Fresnel lens multi-beam rotating mirror 31. A heat sink 15, in the form of cooling fins, is located on the back of the elongated light source substrate 14. Each cell on the outer surface of the tubular array Fresnel lens multi-beam rotating mirror 31 represents a Fresnel lens, equivalent to a convex cylindrical mirror or convex lens. During operation, driven by a drive circuit, a hollow motor rotates the tubular array Fresnel lens multi-beam rotating mirror 31. Light emitted by each LED light source 16 is refracted and reflected by a collimating lens 17 to form a small-angle beam 00, which then strikes the portion of the tubular array Fresnel lens multi-beam rotating mirror 31 facing the object. This refracted light forms multiple scanning beams 01, which scan and illuminate the light-receiving surface 04 of the object. The area illuminated by the scanning beams 01 is called the light zone 02, while the area not illuminated is called the dark zone 03. As the scanning beams 01 move, the light zones 02 and dark zones 03 alternate, providing alternating light and dark pulsed illumination to the object at the same location.

[0075] A variation of this approach involves a heat dissipation device that combines a heat pipe and a heat sink. The elongated heat pipe is placed in close contact with the elongated light source substrate 14. The extended end of the heat pipe extends from the central axis cavity 25 of the hollow motor and connects to an external heat sink, which can be air-cooled or liquid-cooled. The central axis cavity 25 of the hollow motor can be sealed with a filling material, and the end of the tubular array Fresnel lens multi-beam rotating mirror 31 connected to the bearing is also sealed to prevent dust from entering the interior.

[0076] There is also a variation, in which a tubular light-transmitting protective cover is provided, which is made of a fully transparent material and is fixed to the bracket 23, completely wrapping the tubular array Fresnel lens multi-beam rotating mirror 31 and maintaining a certain distance to protect the outer surface of the rotating tubular array Fresnel lens multi-beam rotating mirror 31. Example

[0077] A plant light supplementary lighting system that combines an agricultural high-pressure sodium lamp with a wind wheel-shaped parabolic mirror and a multi-beam rotating mirror. Figure 5 is a schematic cross-sectional view perpendicular to the axis of rotation. Arranged from the inside out are a light source 10, a wind wheel-shaped parabolic mirror and a multi-beam rotating mirror 34, and a fixed Fresnel lens 40. The light source 10 is the luminous core of the agricultural high-pressure sodium lamp, and the outer circle of the light source 10 represents the glass bulb of the agricultural sodium lamp. The wind wheel-shaped parabolic mirror and the multi-beam rotating mirror 34 are composed of 10 parabolic reflectors, which are fixed at the same connection end and connected to the drive motor. The parabolic reflector consists of a base material facing away from the light source and a parabolic mirror reflective surface 341 that is obliquely facing the light source but with its focus located at the light source. The base material serves to support the parabolic mirror reflective surface 341. The fixed Fresnel lens 40 is a lens in the optical path behind the multi-beam rotating mirror. It is divided into two symmetrical halves, each equivalent to a convex lens. Its function is to divide the 360° scanning beam emitted by the pinwheel-shaped parabolic multi-beam rotating mirror 34 into two upper and lower illumination zones, narrowing the range of the scanning illumination and changing the light intensity distribution, thereby providing scanning illumination for the plants on the light-receiving surface 04 in each illumination zone. During operation, a power source is connected to the light source 10 and the drive motor. The light source 10 receives power to emit light at a wide 360° angle. The drive motor rotates the pinwheel-shaped parabolic multi-beam rotating mirror 34. The light emitted by the light source 10 is reflected by the ten parabolic reflective surfaces 341 of the pinwheel-shaped parabolic multi-beam rotating mirror 34, forming ten scanning beams 01. The scanning beams 01 are then refracted by the fixed Fresnel lens 40 to form modified scanning beams 011. The modified scanning beams 011 provide scanning illumination for the plants on the light-receiving surface 04.

[0078] The scanning direction of the corrected scanning beam 011 is the same as the rotation direction of the wind wheel-shaped parabolic mirror multi-beam rotating mirror 34. The area illuminated by the corrected scanning beam 011 is the light zone 02, while the area not illuminated is the dark zone 03. The light zone 02 and the dark zone 03 are within the scanning illumination range, alternating to provide pulsed light illumination to each plant. When the wind wheel-shaped parabolic mirror multi-beam rotating mirror 34 rotates at 1800 rpm, the frequency of the pulsed light generated by the scanning illumination is 300 Hz. When the average width ratio of the light zone 02 to the dark zone 03 in the scanning direction is 1:4, the duty cycle of the pulsed light is 20%.

[0079] In one variation, the wind wheel parabolic mirror multi-beam rotating mirror 34 can be replaced with an array Fresnel lens multi-beam rotating mirror. In another variation, if the interior space of the fixed Fresnel lens 40 is sealed and filled with nitrogen or evacuated, the glass bulb of the agricultural sodium lamp light source 10 can be eliminated, further reducing light energy loss.

[0080] As another variation, the fixed Fresnel lens 40 can also be designed to be equivalent to a plurality of convex lenses, so as to divide the scanning illumination range into a plurality of illumination areas.

[0081] The implementation manner of the present invention is not limited to the above-mentioned specific embodiments. Those skilled in the art can design multiple variations within the scope of the technical solution protected by the present invention, or use similar technical means to achieve the same technical effects of the present invention.

Claims

1. A rotating mirror plant fill light, characterized in that: include: Light source, drive motor and multi-beam rotating mirror; The light source is arranged near a plurality of focal points of the multi-beam rotating mirror, and the driving motor is connected to the multi-beam rotating mirror; During operation, the driving motor drives the multi-beam rotating mirror to rotate, and the light emitted by the light source is reflected and / or refracted by the multi-beam rotating mirror to form multiple rotating light beams to perform scanning illumination on the object to be illuminated, which is a light guide device or a photosynthetic autotrophic organism.

2. According to claim 1, a rotating mirror plant supplementary light, characterized in that: The multi-beam rotating mirror is formed by combining a plurality of convex lenses and / or convex cylindrical lenses to form a disk shape, a tube shape or a barrel shape, and the plurality of convex lenses and / or convex cylindrical lenses are arranged in one or more circles around the rotation axis.

3. According to claim 1, a rotating mirror plant supplementary light, characterized in that: The multi-beam rotating mirror is formed by combining a plurality of focusing mirrors to form a pyramidal shape, a turbofan shape or a wind wheel shape, and the plurality of focusing mirrors are arranged in one or more circles around the rotation axis.

4. The rotating mirror plant supplementary light according to claim 3, characterized in that: The focusing mirror is a parabolic mirror, and the light emitted by the light source is reflected by a plurality of rotating parabolic mirrors to form a plurality of rotating light beams to perform scanning illumination on the illuminated object.

5. The rotating mirror plant supplementary light according to claim 1, characterized in that: The multi-beam rotating mirror is composed of array Fresnel lenses equivalent to multiple convex lenses and / or convex cylindrical lenses. The array Fresnel lenses are in a dish, tube or barrel shape and are arranged in one or more circles around the rotation axis.

6. A rotating mirror plant supplementary light according to any one of claims 1 to 5, characterized in that: The multi-beam rotating mirror has a connecting end located at the edge or the rotating axis, the rotor of the driving motor is connected to the connecting end of the multi-beam rotating mirror and drives the multi-beam rotating mirror to rotate, and the stator of the driving motor is installed on a lamp holder or a bracket.

7. A rotating mirror plant supplementary light according to any one of claims 1 to 5, characterized in that: The multi-beam rotating mirror has a connecting end located at the edge or the rotating axis, and the driving motor is a hollow motor. The rotor of the hollow motor is connected to the connecting end of the multi-beam rotating mirror and drives the multi-beam rotating mirror to rotate, and the middle through hole of the hollow motor serves as a light through hole or a light source wiring hole.

8. A rotating mirror plant supplementary light according to any one of claims 1 to 5, characterized in that: A reflective curved surface and / or lens fixed relative to the light source should also be provided in the front light path and / or rear light path of the multi-beam rotating mirror, and its function is to change the light intensity distribution of the front light path and / or rear light path of the multi-beam rotating mirror.

9. The rotating mirror plant supplementary light according to claim 6, characterized in that: A reflective curved surface and / or lens fixed relative to the light source should also be provided in the front light path and / or rear light path of the multi-beam rotating mirror, and its function is to change the light intensity distribution of the front light path and / or rear light path of the multi-beam rotating mirror.

10. A rotating mirror plant supplementary light according to any one of claims 1 to 5, characterized in that: The multi-beam rotating mirror and the light source are both in the same sealed light-transmitting cover, and the air pressure in the sealed light-transmitting cover is lower than the atmospheric pressure or is filled with a gas with an average molecular weight lower than 28.

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