CN113958901A - LED plant lamp device with high light-to-mass ratio and high illumination intensity uniformity - Google Patents
LED plant lamp device with high light-to-mass ratio and high illumination intensity uniformity Download PDFInfo
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- CN113958901A CN113958901A CN202111405393.0A CN202111405393A CN113958901A CN 113958901 A CN113958901 A CN 113958901A CN 202111405393 A CN202111405393 A CN 202111405393A CN 113958901 A CN113958901 A CN 113958901A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/08—Lighting devices intended for fixed installation with a standard
- F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
- F21S8/086—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/04—Electric or magnetic or acoustic treatment of plants for promoting growth
- A01G7/045—Electric or magnetic or acoustic treatment of plants for promoting growth with electric lighting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/14—Measures for saving energy, e.g. in green houses
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Botany (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- Environmental Sciences (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The invention relates to the technical field of plant growth illumination, in particular to an LED plant lamp device with high light quality ratio and high illumination intensity uniformity, which comprises a frame body, wherein a plant planting pot mechanism is arranged at the bottom of the frame body, the frame body comprises two upright posts, two sides of the upper end of the upright posts at two sides are respectively and fixedly connected with a second fixed rod and a first fixed rod, the second fixed rods at two sides, the first fixed rods at two sides and an installation plate are fixedly connected between the upright posts at two sides, the LED lamp bead structure design and layout are a light source space structure which can be most suitable for plant growth, the light quality symmetry in the horizontal axis direction can be realized, the illumination uniformity on the vertical axis is effectively improved, the LED lamp structure adopts a secondary optical design, the light loss can be reduced as much as possible, the light utilization rate is improved, and the LED light source layout designed by the invention adopts a non-equidistant mode, the distances among all the lamp beads are different, so that the illumination intensity uniformity of the light source in the space can be effectively improved.
Description
Technical Field
The invention relates to the technical field of plant growth illumination, in particular to an LED plant lamp device with high light-to-quality ratio and illumination intensity uniformity.
Background
The plant growth lighting system is an important unit in indoor planting of intelligent greenhouses, plant factories and the like, illumination plays a key role in plant photomorphogenesis, plastid differentiation and plant growth and development, and not only is the driving force of plant photosynthesis, but also is a plant growth regulation and control signal, and the growth and development process of plants is regulated by exciting related gene expression to influence the yield and quality of the plants. A series of photoreceptors exist in the plant body, so that the plant can accurately and timely sense the change of the light environment. The existing research shows that the light environment (illumination intensity, light quality proportion, illumination period, illumination time and space distribution) for plant growth is comprehensively and finely regulated, and a reasonable illumination regulation scheme and light distribution are formulated, so that the plant quality can be remarkably improved, and the energy consumption of a light source can be effectively reduced.
The existing LED device adopts lamp beads with different colors, mainly comprises red light beads and blue light beads which are assembled into an LED array, the LED array is mixed into a certain specific light-quality ratio after light emission or adopts fluorescent powder to adjust the spectrum, the proportion of the lamp beads with different colors is fixed, the light-quality ratio after the light mixing of the LED array is not adjustable, the structure of the LED lamp beads is designed, lamp beads formed by assembling light-emitting chips with different colors are adopted, the light quality of the plant lamp beads is asymmetrical in space, the uniformity of illumination intensity is not high, more invalid illumination areas exist, and the LED plant lamps mostly adopt independent red, blue, white light and other light-emitting chips with large light-emitting angles, although the light-emitting angles are large, the mixed illumination areas are large, the light energy utilization rate is low, a few lamp beads integrated by the light-emitting chips with different colors are adopted, and then a condensing lens is adopted to concentrate the light flux on a planting surface, however, the positions of the light-emitting chips with different colors after light emission are different, and light spots are easily generated after light condensation, so that the light quality in space is asymmetric.
Therefore, there is a need for an LED plant lamp device with high light-to-quality ratio and illumination intensity uniformity to improve the above problems.
Disclosure of Invention
The invention aims to provide an LED plant lamp device with high light-to-quality ratio and illumination intensity uniformity, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a LED plant lamp device with high light quality ratio and high illumination intensity uniformity comprises a frame body, wherein a plant planting pot mechanism is arranged at the bottom of the frame body, the frame body comprises two upright posts, two sides of the upper end of the upright posts on two sides are respectively and fixedly connected with a second fixing rod and a first fixing rod, two sides of the second fixing rod and two sides of the first fixing rod and two sides of the upright posts are respectively and fixedly connected with a mounting plate, the lower end of each mounting plate is provided with an LED plant lamp body, an LED power supply assembly and an LED light source assembly are arranged in the LED plant lamp body, the LED light source assembly comprises a lamp bead, the lamp bead is square, the diagonal line of the lamp bead is superposed with the central axis of a circuit board, warm white light chips, blue light chips and red light chips are respectively arranged on the lamp bead, the warm white light chips are provided with two parts, and are arranged along the diagonal line of the lamp bead on the lamp bead, blue light chip and ruddiness chip respectively are provided with one and follow another diagonal setting of lamp pearl on the lamp pearl, LED power supply unit includes the circuit board, LED light source subassembly is the equidistant formula of non-and sets up on the circuit board.
As a preferable scheme of the invention, the LED light source component further comprises a lens, and the lens is connected with the lamp beads through sealing glue.
As a preferred scheme of the invention, each of the warm white chip, the blue chip and the red chip is electrically connected with the circuit board through an independent outgoing line, and the natural light emitting angle range of the warm white chip, the blue chip and the red chip in the lens is 120-140 degrees.
In a preferred embodiment of the present invention, the refractive angle of the lens is 15 degrees, 30 degrees, 45 degrees, 60 degrees, or 90 degrees.
As a preferable scheme of the invention, the LED plant lamp body is fixedly connected with the mounting plate through a rotatable adjusting mounting structure, the LED plant lamp body comprises a lamp frame, a mounting groove is formed in the lower surface of the lamp frame, and the LED power supply assembly is mounted inside the mounting groove.
As a preferable scheme of the invention, the rotatably adjustable mounting structure comprises fixing pieces fixedly connected with two ends of the lamp frame, mounting pieces fixedly connected with the mounting plate are arranged on one sides of the fixing pieces at the two ends, an arc-shaped groove is formed in each mounting piece, the mounting pieces and the fixing pieces are fixedly connected through fixing bolts, and metal radiating fins for radiating heat are arranged on two outer sides of each lamp frame.
As a preferable scheme of the present invention, the second fixing rods on both sides, the first fixing rods, and the mounting plates between the uprights are located at different heights, the mounting plates between the uprights on both sides are located above the mounting plates between the second fixing rods on both sides, and the mounting plates between the second fixing rods on both sides are located above the mounting plates between the first fixing rods on both sides.
Compared with the prior art, the invention has the beneficial effects that:
1. the plant lamp beads adopt a square structure and consist of four light-emitting chips, wherein two of the light-emitting chips are warm white chips, the other two light-emitting chips are blue light chips and red light chips respectively, each color chip is provided with an independent outgoing line, the light-emitting chips are independently driven and controlled, the lamp beads are arranged in the axial direction of the circuit board along the diagonal line of the lamp beads, the intervals among the lamp beads are unequal, and the plant photosynthetic efficiency and the uniformity of space illumination intensity can be effectively improved;
2. the LED plant lamp body provided by the invention adopts a strip-shaped lamp structure, the chips of the lamp beads on the two sides of the axis of the lamp bead are warm white chips, the two chips on the axis of the circuit board are respectively a blue chip and a red chip, so that the LED plant lamp realizes light quality symmetry in the axis direction, the light quality ratios of red light and blue light are the same, the light quality of an LED light source is accurately adjusted, and each lamp bead adopts a lens with a proper light-emitting angle, so that the light utilization rate can be improved, and the contradiction between light condensation and uniform light quality distribution is solved;
3. the LED plant lamp body provided by the invention adopts the lamp beads integrated by the multiband light-emitting chips, red, blue and warm white light are emitted from the same lamp bead in a centralized manner and then irradiated to the surface of a plant through the lens, the light mixing is uniform, the light-emitting chips of each color can independently adjust the driving current, and the light period and the illumination intensity can be dynamically adjusted through an external driving power supply according to the needs.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a perspective view of the LED plant lamp body of the present invention;
FIG. 3 is an exploded view of the lighting fixture of the present invention;
FIG. 4 is a schematic view of a mounting structure of a circuit board and a lamp bead structure according to the present invention;
FIG. 5 is an exploded view of a lamp bead of the present invention;
fig. 6 is a schematic diagram of a lamp bead chip in the invention.
In the figure: the LED lamp holder comprises a holder body 1, a first fixing rod 2, a mounting plate 3, a lamp frame 4, a mounting groove 5, a mounting part 6, a fixing bolt 61, an arc-shaped groove 62, an LED light source assembly 7, a lamp bead 71, a warm white light chip 711, a blue light chip 712, a red light chip 713, a sealing glue 72, a lens 73, a circuit board 8, a fixing part 9 and a second fixing rod 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1-6, the present invention provides a technical solution:
the embodiment, please refer to fig. 1, 2, 3, 4, 5 and 6, a light quality ratio and high LED plant lamp device of illumination intensity homogeneity, comprising a frame body 1, the bottom of frame body 1 is provided with plant planting basin mechanism, frame body 1 includes two stands, the upper end both sides of both sides stand are fixedly connected with second dead lever 10 and first dead lever 2 respectively, both sides second dead lever 10, fixedly connected with mounting panel 3 between first dead lever 2 of both sides and the stand of both sides, the LED plant lamp body is all installed to the lower extreme of every mounting panel 3, this internal LED power supply subassembly and the LED light source subassembly 7 of being equipped with of LED plant lamp, its characterized in that: the LED light source assembly 7 comprises a lamp bead 71, the lamp bead 71 is square, the diagonal line of the lamp bead 71 coincides with the central axis of the circuit board 8, warm white chips 711, blue chips 712 and red chips 713 are respectively arranged on the lamp bead 71, the warm white chips 711 and the blue chips 712 and the red chips 713 are arranged on the lamp bead 71 along the diagonal line of the lamp bead 71, one warm white chip 711 and one red chip 713 are respectively arranged on the lamp bead 71 along the other diagonal line of the lamp bead 71, the LED power supply assembly comprises the circuit board 8, the LED light source assembly 7 is arranged on the circuit board 8 in an unequal interval mode, the LED light source assembly 7 further comprises a lens 73, the lens 73 is connected with the lamp bead 71 through a sealing glue 72, each warm white chip 711, each blue chip 712 and each red chip 713 are respectively and electrically connected with the circuit board 8 through independent outgoing lines, the natural light emitting angle ranges of the warm white chips 711, the blue chips 712 and the red chips 713 in the lens 73 are 120-140 degrees, the refraction angle of the lens 73 is 15 degrees, 30 degrees, 45 degrees, 60 degrees or 90 degrees, the lamp beads 71 adopt lamp beads integrated by multiband light-emitting chips, each color unit is provided with an independent outgoing line so as to be driven and controlled independently, after the light-emitting chips with different colors are mixed in the lamp beads, the natural light-emitting angle is 120 degrees-140 degrees, light rays pass through the 15 degrees, 30 degrees, 45 degrees, 60 degrees or 90 degrees lens and irradiate the surface of a plant after passing through a waterproof light-transmitting surface, the light mixing is uniform, the lens angle can be selected or changed according to application occasions, the shell adopts aluminum materials, each lamp bead 71 is formed by combining four light-emitting chips which are respectively two warm white light chips 711, one blue light chip 712 and one red light chip 713, the appearance of the lamp bead 71 is square, each lamp bead 71 is arranged along the axial direction of the circuit board 8 according to the diagonal line of the lamp bead, the two light-emitting chips 712 and the red light chip 713 of each lamp bead 71 in the axial direction, warm white chips 711 are on both sides of the axis of the circuit board 8. The light quality of LED plant lamp on the horizontal axis direction of circuit board 8 can be guaranteed to such a mode of placement, the light quality ratio of red, blue light on the diagonal is the same, and on every lamp pearl 71's mounted position, the interval of selecting between the lamp pearl 71 mounted position is unequal, in order to improve the illumination intensity homogeneity on the vertical axis direction, integrated lamp pearl 71 is through once encapsulation, limit its luminous angle, the efficiency is drawn forth to the light has been improved, again through secondary optical design, change the output of LED light, combine lamp pearl 71 structural design and overall arrangement, redistribute light, the light loss is reduced, the light utilization rate is improved, its illumination degree of consistency improves greatly.
Referring to fig. 2 and 3, the LED plant lamp body includes a lamp frame 4, a mounting groove 5 is formed on a lower surface of the lamp frame 4, the LED power supply assembly is mounted inside the mounting groove 5, the LED plant lamp body is fixedly connected with the mounting plate 3 through a rotatable adjusting mounting structure, the rotatable adjusting and mounting structure comprises fixing pieces 9 fixedly connected with two ends of the lamp frame 4, mounting pieces 6 fixedly connected with the mounting plate 3 are arranged on one sides of the fixing pieces 9 at the two ends, an arc-shaped groove 62 is formed in each mounting piece 6, the mounting pieces 6 are fixedly connected with the fixing pieces 9 through fixing bolts 61, through the setting of rotatable regulation mounting structure, can carry out certain regulation to the angle of shining of LED plant lamp body, every rim 4's outside both sides all are provided with and are used for radiating metal fin, the light decay phenomenon of the reducible LED lamp pearl of metal fin, increase of service life.
Referring to fig. 1, the second fixing rods 10 on the two sides, the first fixing rods 2 and the mounting plates 3 between the columns are located at different heights, the mounting plates 3 between the columns on the two sides are located above the mounting plates 3 between the second fixing rods 10 on the two sides, the mounting plates 3 between the second fixing rods 10 on the two sides are located above the mounting plates 3 between the first fixing rods 2 on the two sides, and the mounting plates 3 with different heights are arranged, so that the LED plant lamp body can be reasonably mounted, and the illumination distribution is more uniform.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a light quality is than LED plant lamp device with illumination intensity homogeneity is high, includes support body (1), the bottom of support body (1) is provided with plant planting basin mechanism, support body (1) includes two stands, and the upper end both sides of both sides stand are fixedly connected with second dead lever (10) and first dead lever (2) respectively, both sides second dead lever (10), both sides first dead lever (2) and both sides fixedly connected with mounting panel (3), every between the stand LED plant lamp body is all installed to the lower extreme of mounting panel (3), this internal LED power supply subassembly and LED light source subassembly (7) of being equipped with of LED plant lamp, its characterized in that: LED light source subassembly (7) are including lamp pearl (71), lamp pearl (71) are the square, the diagonal of lamp pearl (71) with circuit board (8) the coincidence of central axis, be provided with warm white light chip (711) and blue light chip (712) and ruddiness chip (713) on lamp pearl (71) respectively, warm white light chip (711) are provided with two altogether and follow the diagonal setting of lamp pearl (71) on lamp pearl (71), blue light chip (712) and ruddiness chip (713) respectively are provided with one and follow another diagonal setting of lamp pearl (71) on lamp pearl (71), LED power supply subassembly includes circuit board (8), LED light source subassembly (7) are the equidistant formula of non-setting on circuit board (8).
2. The LED plant lamp device with high light-to-quality ratio and illumination intensity uniformity as claimed in claim 1, wherein: the LED light source assembly (7) further comprises a lens (73), and the lens (73) is connected with the lamp bead (71) through a sealing glue (72).
3. The LED plant lamp device with high light-to-quality ratio and illumination intensity uniformity as claimed in claim 1, wherein: each warm white light chip (711), each blue light chip (712) and each red light chip (713) are electrically connected with the circuit board (8) through independent outgoing lines.
4. The LED plant lamp device with high light-to-quality ratio and illumination intensity uniformity as claimed in claim 3, wherein: the natural light emitting angle range of the warm white chip (711), the blue chip (712) and the red chip (713) in the lens (73) is 120-140 degrees, and the refraction angle of the lens (73) is 15 degrees, 30 degrees, 45 degrees, 60 degrees or 90 degrees.
5. The LED plant lamp device with high light-to-quality ratio and illumination intensity uniformity as claimed in claim 1, wherein: the LED plant lamp body is fixedly connected with the mounting plate (3) through a rotatable adjusting mounting structure and comprises a lamp frame (4), a mounting groove (5) is formed in the lower surface of the lamp frame (4), and the LED power supply assembly is mounted inside the mounting groove (5).
6. The LED plant lamp device with high light-to-quality ratio and illumination intensity uniformity as claimed in claim 5, wherein: but rotation regulation mounting structure include with rim (4) both ends fixed connection's mounting (9), both ends one side of mounting (9) all is provided with mounting part (6) with mounting panel (3) fixed connection, arc wall (62) have been seted up on mounting part (6), through fixing bolt (61) fixed connection, every between mounting part (6) and mounting (9) the outside both sides of rim (4) all are provided with and are used for radiating metal fin.
7. The LED plant lamp device with high light-to-quality ratio and illumination intensity uniformity as claimed in claim 1, wherein: both sides mounting panel (3) between second dead lever (10), first dead lever (2) and the stand are located not co-altitude, and both sides mounting panel (3) between the stand are located both sides the top of mounting panel (3) between second dead lever (10), and both sides mounting panel (3) between second dead lever (10) are located both sides the top of mounting panel (3) between first dead lever (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405393.0A CN113958901A (en) | 2021-11-24 | 2021-11-24 | LED plant lamp device with high light-to-mass ratio and high illumination intensity uniformity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405393.0A CN113958901A (en) | 2021-11-24 | 2021-11-24 | LED plant lamp device with high light-to-mass ratio and high illumination intensity uniformity |
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| Publication Number | Publication Date |
|---|---|
| CN113958901A true CN113958901A (en) | 2022-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111405393.0A Withdrawn CN113958901A (en) | 2021-11-24 | 2021-11-24 | LED plant lamp device with high light-to-mass ratio and high illumination intensity uniformity |
Country Status (1)
| Country | Link |
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| CN (1) | CN113958901A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013760A (en) * | 2022-05-23 | 2022-09-06 | 佛山科学技术学院 | Plant illumination control system capable of simulating sunlight cycle |
-
2021
- 2021-11-24 CN CN202111405393.0A patent/CN113958901A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013760A (en) * | 2022-05-23 | 2022-09-06 | 佛山科学技术学院 | Plant illumination control system capable of simulating sunlight cycle |
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Application publication date: 20220121 |
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