CN108562969B - Square lamp with high luminous efficiency - Google Patents
Square lamp with high luminous efficiency Download PDFInfo
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- CN108562969B CN108562969B CN201810463214.0A CN201810463214A CN108562969B CN 108562969 B CN108562969 B CN 108562969B CN 201810463214 A CN201810463214 A CN 201810463214A CN 108562969 B CN108562969 B CN 108562969B
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- light
- light guide
- light source
- strip
- guide surface
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- 238000009792 diffusion process Methods 0.000 claims abstract description 3
- 230000007423 decrease Effects 0.000 claims description 6
- 238000000748 compression moulding Methods 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 5
- 241000276425 Xiphophorus maculatus Species 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 241001465382 Physalis alkekengi Species 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
Abstract
The invention provides a square lamp with high light efficiency, which comprises an outer frame and a square light guide plate arranged on the outer frame, wherein a light source is arranged on the side edge of the square light guide plate, a diffusion plate is arranged on the front side of the outer frame, a reflecting film is arranged on the back side of the outer frame, the square light guide plate comprises a transparent plate-shaped body, the plate-shaped body comprises a first light guide surface and a second light guide surface which are arranged on the two vertical sides, a plurality of strip-shaped reflecting areas which are sequentially arranged along the radial direction are arranged on the second light guide surface, and each strip-shaped reflecting area comprises a light guide surface and a light guide surface, wherein the light guide surface forms an included angle with the light source light inlet surface and the first light guide surface, and the light guide surface is connected with the light guide surface. After the light beam is reflected by the guide surface, the light beam is conducted and reflected between the guide surface and the first guide surface, the reflection path is shortened, the transmission path of the light beam in the light guide plate is shortened, the loss of the light transmitted in the light guide plate is reduced, the light utilization rate is improved, and finally the light is guided out by the guiding-out surface, and the guiding-out ratio of the light is controlled jointly through a plurality of guiding-out surfaces.
Description
Technical Field
The invention relates to the field of light emitting devices, in particular to a square lamp with high light efficiency.
Background
The light guide plate is an important light-conducting medium for converting a point light source into a planar light source.
The existing light guide plate is designed into a plurality of convex netlike particles (or concave micropores) with different sizes and different distances, and the convex netlike particles play roles in scattering and refracting light, and scatter and refract light beams conducted along the flat plate to the surface of the flat plate, so that the whole optical light guide plate emits soft and uniform plane light.
The shape and the style of the light guide plate are many, including wholly being the rectangle face, also wholly being the circle face, corresponding light guide plate's shape is different, and corresponding structural principle also has the difference, and bulletin number CN204227325U discloses a novel LED high light efficiency square lamps and lanterns, and it includes a transparent or semitransparent platy body, and a side terminal surface of this platy body is equipped with an LED banks at least, platy body surface or form unsmooth V type groove on the optics piece of layering on platy body, unsmooth V type groove is circular line, encircles the central point, the emission light source, reduces the loss of bright.
The light guide plate is a plate-shaped body which is parallel up and down, and the LED lamp group is arranged at the edge of the plate-shaped body. As shown in fig. 1, after the light beam of the LED lamp set on the side edge is incident, the area where the parallel light beam and the concave-convex V-shaped groove on the plate-shaped body can intersect is small, the light source guiding efficiency is extremely low, and the disadvantage is particularly obvious especially in the case of a square lamp with high light efficiency under a small size.
Disclosure of Invention
The invention aims to provide a square lamp with high light efficiency, which has the advantages of higher light output efficiency and lower material cost.
The technical aim of the invention is realized by the following technical scheme:
the square light guide plate comprises a transparent plate-shaped body, the plate-shaped body comprises a first light guide surface and a second light guide surface which are arranged on the two vertical sides, the transparent plate-shaped body is at least provided with a group of symmetrical light source light inlet surfaces, and the light sources are arranged on the outer sides of the light source light inlet surfaces;
the second light guide surface is provided with a plurality of strip-shaped reflecting areas which are sequentially arranged along the direction facing the light source light inlet surface, the linear direction of the strip-shaped reflecting areas is parallel to the light source light inlet surface, the strip-shaped reflecting areas comprise light guide surfaces which respectively form included angles with the light source light inlet surface and the first light guide surface, the light guide surfaces are obliquely arranged relative to the first light guide surface, the light beams of the light source are emitted into the light source light inlet surface through the light source light inlet surface and are refracted or reflected and guided out through the light guide surfaces, and the plurality of light guide surfaces jointly control the light guide rate of the light rays emitted into the light source light inlet surface;
the strip-shaped reflecting area further comprises a conducting surface connected with the guiding surface, the conducting surface is close to one side of the second light guiding surface, the height between each conducting surface and the first light guiding surface gradually decreases towards the direction of the central line of the two light source light inlet surfaces, the included angle formed by the tangent line of any point of the conducting surface and the first light guiding surface is smaller than the included angle formed by the tangent line of any point of the guiding surface and the first light guiding surface, the light beams of the light sources are conducted and reflected between the conducting surface and the first light guiding surface along the direction from the light source light inlet surface to the central line, wherein the light beams reflected by the conducting surface and the first light guiding surface form an alpha included angle, and the alpha included angle gradually increases along with the repeated reflection of the light beams on the conducting surface.
Further, the strip-shaped reflecting area arranged on the second light guide surface is a linear continuous strip-shaped surface or a strip-shaped surface with continuous intervals.
The strip-shaped reflecting areas are arranged on the second light guide surface in a crossed or parallel mode.
Further, the number of the guiding-out surfaces of the strip-shaped reflecting area is two, the inclined directions of the two adjacent leading-out surfaces are opposite, and the ends of the two leading-out surfaces on one side far away from the conducting surface are connected through the connecting surface.
The length of the guide surface facing the light source light incident surface gradually decreases along the direction from the light source light incident surface to the central line.
The distance between the connecting surface of each strip-shaped reflecting area and the highest point of the leading-out surface is gradually increased along the direction from the light source light incident surface to the central line.
The arc transition is further arranged between the connecting surface and the guiding-out surface.
The angle formed by the tangent line of any point of the conducting surface and the first conducting surface is 0-15 degrees, and the angle formed by the tangent line of any point of the guiding surface and the first conducting surface is 20-60 degrees.
Further, the guiding surface continuously forms an arc surface or a curved surface or a stepped surface on the same path on the second guiding surface.
Further provided, the plate-shaped body is formed by rolling, compression molding or injection molding.
The invention has the following beneficial effects:
1. arranging a point light source at the outer ring of the square high-light-efficiency lamp, enabling the light source to enter the plate-shaped body from the outer ring, reflecting light rays between a first light guide surface and a second light guide surface, wherein a plurality of strip-shaped reflecting areas which are sequentially arranged along the radial direction are arranged on the second light guide surface, forming optical density and optical scattering between materials of the light guide plate and air, respectively bringing about refraction and total reflection under certain conditions of an incident angle, and reflecting the light rays from the light guide surface to the first light guide surface again when the incident angle of the incident light rays meets the total reflection condition, continuously transmitting the light rays from the outer ring surface to a central line by the first light guide surface, and refracting the light rays out of the second light guide surface otherwise; with the same strip-shaped reflecting area structure, the thicker the light guide plate is, the lower the guiding efficiency is, and conversely, the thinner the light guide plate is, the higher the guiding efficiency is. The plate-like body is arranged to have a large thickness near the light entrance face of the light source and a smaller thickness at the center line. The thickness of the light incidence surface is larger than the size of the lamp beads, light leakage is reduced, the use of materials can be reduced under the condition that the thickness of the light guide plate is the same, and the cost is greatly reduced when the number of the light guide plates is large.
2. For further flattening and softness of the light rays of the whole light guide plate, the arrangement density of the light guide surface at the low light source is more than that of the light guide surface at the high light source, and the distance between the connecting surface of each strip-shaped reflecting area and the highest point of the light guide surface is sequentially increased along the direction from the central line to the outer circular surface. The light beam of the high beam end is utilized and led out more efficiently, and the light guiding-out efficiency is higher.
Drawings
FIG. 1 is a schematic view of a prior art uniform thickness high light efficiency square luminaire;
FIG. 2 is a schematic view of the light output of a prior art square luminaire of uniform thickness with high light efficiency;
FIG. 3 is a schematic view of a high light efficiency square luminaire of the present application;
FIG. 4 is a schematic view of a high light efficiency square luminaire of the present application;
FIG. 5 is a top view of a high light efficiency square luminaire of the present application;
FIG. 6 is a detailed view of the annular reflective area of the high light efficiency square luminaire of the present application;
fig. 7 is a schematic view of the light output of the square lamp with high light efficiency.
In the figure, 1, a plate-like body; 2. a first light guide surface; 3. a second light guide surface; 4. a light source light incident surface; 5. an annular reflective region; 6. a lead-out surface; 7. a connection surface; 8. a conductive surface; 9. square lamp with high luminous efficiency; 10. a diffusion plate; 11. a reflective film; 12. an outer frame; 13. a light source.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
the utility model provides a high light efficiency square lamp, as shown in fig. 3, includes frame 12, installs the high light efficiency square lamp 9 on frame 12, and the side of high light efficiency square lamp 9 is equipped with light source 12, and the front of frame 12 is equipped with diffuser plate 10, and the back is equipped with reflective film 11.
As shown in fig. 4, the square lamp 9 with high luminous efficiency comprises a transparent plate-shaped body 1, and the plate-shaped body 1 is formed by rolling, compression molding or injection molding. The transparent plate-shaped body is provided with at least one group of symmetrical light source light incident surfaces 4, and the light sources are arranged outside the light source light incident surfaces to provide light sources for the inside of the plate-shaped body 1.
As shown in fig. 4 and 5, the plate-shaped body 1 includes a first light guiding surface 2 and a second light guiding surface 3 in two vertical directions, and a plurality of strip-shaped reflective regions 5 sequentially arranged towards the light source light incident surface 4 are disposed on the second light guiding surface 3.
Since the stripe-shaped reflection area 5 is a minute structure, the scale of the size of each component in fig. 5 is only referred to by enlarging fig. 5 as a schematic diagram showing the stripe-shaped reflection area 5 in order to show the structure.
Referring to fig. 6, each strip-shaped reflection area 5 includes two inclined guiding surfaces 6, and the inclination directions of the two guiding surfaces 6 are opposite, in an ideal state, the two guiding surfaces 6 may intersect at a point to form a V-shaped structure, so that the effect of the two guiding surfaces 6 can be maximized. However, since the V-shaped structure where the output surfaces 6 intersect has viscoelasticity during plastic molding, a connection surface 7 is further disposed between the two output surfaces 6 of each strip-shaped reflection area 5, and an inverted trapezoid shape is formed between the connection surface 7 and the two output surfaces 6, where the connection surface 7 may be a cambered surface or a plane surface.
The strip-shaped reflection area 5 further comprises a conduction surface 8 connected with the guiding surface 6, the conduction surface 8 is close to one side of the second guiding surface 3, the height between each conduction surface 8 and the first guiding surface 2 gradually decreases along the direction from the light source light-in surface 4 to the central line, and an included angle formed by a tangent line at any point of the conduction surface 8 and the first guiding surface 2 is smaller than an included angle formed by a tangent line at any point of the guiding surface 6 and the first guiding surface 2. Specifically, the included angle formed by the tangent line at any point of the conducting surface 8 and the first light guiding surface 2 is 0-15 degrees, and the included angle formed by the tangent line at any point of the guiding surface 6 and the first light guiding surface 2 is 20-60 degrees. The above-mentioned guide surface 8 continuously forms an arc surface or a curved surface or a stepped surface on the same path on the second guide surface 3.
Based on the above arrangement, the light output of the high-light-efficiency square lamp is compared and analyzed, as shown in fig. 2, fig. 2 is a schematic diagram of the light output of the high-light-efficiency square lamp in the prior art after the concave-convex V-shaped groove is arranged in fig. 1, the side of the high-light-efficiency square lamp is fed, taking the cross-sectional view in fig. 2 as an example, the left side of the light source is fed, the middle is the light output of the center line position of the high-light-efficiency square lamp, and the right side is the farthest end of the light source in the light input position. After light enters the side direction of the light guide plate, the light emitted by each side light source reaches the center line position theoretically, and the light sources arranged on the circumference of the light guide plate just meet the overall brightness of the square lamp with high light efficiency. Because of the light side penetrability, a larger part of light passes through the center line after passing through the center line, the reflection path of the part of light is longer, even, a part of light beam is directly emitted from the other end, the light cannot be effectively utilized and guided out, and the light guiding rate is very low.
As shown in fig. 7, the conductive surface 6 is configured such that the second light guiding surface 3 is concave, and specifically, two sides of the square lamp with high light efficiency are thicker, and the center line is thinner. Referring to fig. 3, since the thickness of the light guide plate decreases from the near light end toward the far light end, after the light beam is reflected by the guide surface 8, the light beam is reflected by the guide surface 8 and is guided between the guide surface 8 and the first light guide surface 2, the reflection path is shortened, the transmission path of the light beam in the light guide plate is shortened, the loss of light transmitted in the light guide plate is reduced, and the light utilization rate is improved. And because the included angle between the reflected light beam of the guide surface 8 and the alpha of the first light guide surface 2 becomes larger gradually, the light is led out more conveniently, the light leading-out proportion is improved, and the light leading-out efficiency is improved. Finally, the concave shape is formed by the guide surface 8, the thickness of the center line position is thinner, the light guiding efficiency is inversely proportional to the thickness of the light guide plate, the thinner the thickness of the center line position is, the higher the light guiding efficiency is, and the 50% guiding efficiency of the light guide plate with equal thickness is at least improved to more than 80%.
In addition, the light beam of the light source is incident through the light source incident surface 4 and is refracted and guided out or reflected by the guiding surface 6, specifically, referring to fig. 5, the light beam is guided out after being refracted by the guiding surface 6, but a small amount of the light beam is still reflected, the light beam is continuously reflected by the first guiding surface 2, the guiding surface 6 guides out the light, and the guiding ratio of the light beam is commonly controlled by a plurality of guiding surfaces 6.
If the light guiding surface 6 and the connecting surface 7 are made into a trapezoid-like structure, the connecting surface 7 and the first light guiding surface 2 are in parallel relation, in this state, when light is reflected from the first light guiding surface 2 to the connecting surface 7, since no included angle exists between the connecting surface 7 and the first light guiding surface 2, the connecting surface 7 cannot lead out light beams, so that in order to refer to the light guiding efficiency, the connecting surface 7 is made into an arc shape, and an arc transition is formed between the connecting surface 7 and the two light guiding surfaces 6, so that the light beams are not planned to be emitted under the radian of the tiny connecting surface 7, the light beams are more favorably conducted to the central line position of the high-light-efficiency square lamp because of the repeated reflection of the light beams is increased, and the light homogenizing effect is achieved. And because the dimension of the leading-out surface 6 of the connecting surface 7 is in the micron order, if the connecting surface 7 is not in excessive arc but is connected with the leading-out surface 6 in an intersecting way, the shape of the connecting point of the intersecting sharp corner is difficult to be molded due to the viscoelasticity of the material at high temperature.
Since the intensity of the light emitted from the near light source is relatively high, and the light emitted from the far light source is relatively low, the radial length of the conducting surface 8 is smaller as the distance from the point light source is increased. Stated another way, the lead-out face 6 near the point light source is arranged so as to be distant from the point light source. In this way, the light guide plate having the same thickness as the above-mentioned lead-out surface 6 can be used in a much higher ratio. Furthermore, the light beams at the far-beam end are more efficiently utilized and guided out because the guiding-out surface 6 is in a sparse and dense arrangement basis.
Further, for the outgoing surface 6 far from the point light source, the distance between the connection surface 7 of each strip-shaped reflection area 5 and the highest point of the outgoing surface 6 gradually increases along the direction from the light source light incident surface 4 to the central line. The design can ensure that the distance between the connecting surface 7 at the far light source and the first light guide surface 2 is small, and the guiding efficiency is further improved. More importantly, the number of reflection and refraction times of light is increased, the utilization rate of the guiding surface 6 is increased, and the guiding ratio is improved.
Under the structure of the light guide plate, the material is not only reduced, and the light guide plate has great economic benefit, but also is more beneficial to the light guiding-out than the traditional light guide plate.
In addition, the strip-shaped reflection areas 5 with the same rule can also be arranged on the first light guide surface 2.
The above-described embodiments are provided for illustration only and not for limitation of the present invention, and modifications may be made to the embodiments without creative contribution by those skilled in the art after reading the present specification, as long as they are protected by patent laws within the scope of claims of the present invention.
Claims (8)
1. The square lamp with high light efficiency comprises an outer frame (12), a square light guide plate (9) arranged on the outer frame (12), a light source (13) is arranged on the side edge of the square light guide plate (9), a diffusion plate (10) is arranged on the front side of the outer frame (12), a reflecting film (11) is arranged on the back side of the outer frame, the square light guide plate (9) comprises a transparent plate-shaped body (1), and the square lamp is characterized in that the plate-shaped body (1) comprises a first light guide surface (2) and a second light guide surface (3) which are arranged on two vertical sides, the transparent plate-shaped body is at least provided with a group of symmetrical light source light inlet surfaces (4), and the light source is arranged on the outer side of the light source light inlet surfaces;
the second light guide surface (3) is provided with a plurality of strip-shaped reflecting areas (5) which are sequentially arranged along the direction facing the light source light inlet surface (4), the linear direction of the strip-shaped reflecting areas (5) is parallel to the light source light inlet surface (4), the strip-shaped reflecting areas (5) comprise light outlet surfaces (6) which respectively form included angles with the light source light inlet surface (4) and the first light guide surface (2), the light outlet surfaces (6) are obliquely arranged relative to the first light guide surface (2), light beams of the light source are emitted into the light outlet surfaces (6) through the light source light inlet surface (4) for refraction or reflection and are led out, and the light outlet surfaces (6) jointly control the light outlet ratio of the light emitted from the light source light inlet surface (4);
the strip-shaped reflecting area (5) further comprises a conducting surface (8) connected with the light guiding surface (6), the conducting surface (8) is close to one side of the second light guiding surface (3), the height between each conducting surface (8) and the first light guiding surface (2) gradually decreases towards the central line direction of the two light source light inlet surfaces (4), an included angle formed by a tangent line of any point of the conducting surface (8) and the first light guiding surface (2) is smaller than an included angle formed by a tangent line of any point of the light guiding surface (6) and the first light guiding surface (2), light beams of the light sources are conducted and reflected between the conducting surface (8) and the first light guiding surface (2) along the direction from the light source light inlet surfaces (4) to the central line, and an included angle alpha is formed between the light beams reflected by the conducting surface (8) and the first light guiding surface (2), and the included angle alpha is gradually increased along with repeated reflection of the light beams on the conducting surface (8);
the number of the guide-out surfaces (6) of the strip-shaped reflecting area (5) is two, the inclination directions of two adjacent guide-out surfaces (6) are opposite, and the ends of one sides of the two guide-out surfaces (6) far away from the guide-out surface (8) are connected through the connecting surface (7);
an included angle formed by a tangent line of any point of the conducting surface (8) and the first conducting surface (2) is 0-15 degrees, and an included angle formed by a tangent line of any point of the guiding surface (6) and the first conducting surface (2) is 20-60 degrees.
2. The high light efficiency square luminaire of claim 1, wherein: the strip-shaped reflecting area (5) arranged on the second light guide surface (3) is a linear continuous strip-shaped surface or a strip-shaped surface with continuous intervals.
3. The high light efficiency square luminaire of claim 2, wherein: the strip-shaped reflecting areas (5) arranged on the second light guide surface (3) are arranged in a crossed mode or in a parallel mode.
4. The high light efficiency square luminaire of claim 1, wherein: the length of the conduction surface (8) facing the light source light-in surface (4) gradually decreases along the direction from the light source light-in surface (4) to the central line.
5. The high light efficiency square luminaire of claim 4, wherein: the distance between the connecting surface (7) of each strip-shaped reflecting area (5) and the highest point of the leading-out surface (6) gradually increases along the direction from the light source light-in surface (4) to the central line.
6. The high light efficiency square luminaire of claim 5, wherein: the connection surface (7) and the guide-out surface (6) are arranged to form an arc transition.
7. A high light efficiency square luminaire as claimed in claim 1 or 2 or 3, characterized in that: the conducting surface (8) continuously forms a curved surface or a stepped surface on the same path on the second conducting surface (3).
8. The high light efficiency square luminaire of claim 1, wherein: the plate-shaped body (1) is formed by rolling, compression molding or injection molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810463214.0A CN108562969B (en) | 2018-05-15 | 2018-05-15 | Square lamp with high luminous efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810463214.0A CN108562969B (en) | 2018-05-15 | 2018-05-15 | Square lamp with high luminous efficiency |
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| Publication Number | Publication Date |
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| CN108562969A CN108562969A (en) | 2018-09-21 |
| CN108562969B true CN108562969B (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810463214.0A Active CN108562969B (en) | 2018-05-15 | 2018-05-15 | Square lamp with high luminous efficiency |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115542611B (en) * | 2022-11-25 | 2023-03-17 | 惠科股份有限公司 | Backlight module and display device |
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| CN103939790A (en) * | 2013-01-22 | 2014-07-23 | 群创光电股份有限公司 | Display device and light-emitting module thereof |
| CN105221967A (en) * | 2015-10-26 | 2016-01-06 | 江苏新广联科技股份有限公司 | A kind of LED panel lamp based on compact disk structure |
| CN206176151U (en) * | 2016-10-11 | 2017-05-17 | 上海乙班电子科技有限公司 | Luminous lamps and lanterns of side with little light -directing structure |
| CN208255459U (en) * | 2018-05-15 | 2018-12-18 | 杭州矽能新材料有限公司 | High photosynthetic efficiency square light fitting |
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|---|---|
| CN108562969A (en) | 2018-09-21 |
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