CN108561806B - High light effect round lamp - Google Patents
High light effect round lamp Download PDFInfo
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- CN108561806B CN108561806B CN201810486537.1A CN201810486537A CN108561806B CN 108561806 B CN108561806 B CN 108561806B CN 201810486537 A CN201810486537 A CN 201810486537A CN 108561806 B CN108561806 B CN 108561806B
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- light
- light guide
- guide surface
- light source
- guiding
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- 238000000748 compression moulding Methods 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 235000009537 plain noodles Nutrition 0.000 claims 1
- 238000009792 diffusion process Methods 0.000 abstract 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
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- 238000010586 diagram Methods 0.000 description 2
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- 239000002245 particle Substances 0.000 description 2
- 241001465382 Physalis alkekengi Species 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
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- 238000010137 moulding (plastic) Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
Classifications
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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
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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
-
- 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
- F21V2200/00—Use of light guides, e.g. fibre optic devices, in lighting devices or systems
- F21V2200/20—Use of light guides, e.g. fibre optic devices, in lighting devices or systems of light guides of a generally planar shape
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a high-light-efficiency round lamp, which comprises an outer frame and a light guide plate arranged on the outer frame, wherein a light source is arranged on the side edge of the 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 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 in the axial two side directions, a plurality of annular reflecting areas which are sequentially arranged along the radial direction are arranged on the second light guide surface, and each annular 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 high-light-efficiency round lamp.
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 circular 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 high-light-efficiency circular lamp with a small size.
Disclosure of Invention
The invention aims to provide a high-light-efficiency round lamp, 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 circular light guide plate comprises a transparent plate-shaped body, and is characterized in that the plate-shaped body comprises a first light guide surface and a second light guide surface in the axial two side directions, a light source incident surface is arranged on the outer side of the circumference, and the light source is arranged on the outer side of the circumference of the circular light guide plate with high light efficiency;
the second light guide surface is provided with a plurality of annular reflecting areas which are sequentially arranged along the radial direction, the annular reflecting areas comprise guide surfaces which respectively form included angles with the light source light inlet surface and the first light guide surface, the 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 guide surfaces, and the guide surfaces jointly control the guiding rate of the light rays emitted into the light source light inlet surface;
The annular reflection area further comprises a conduction surface connected with the guiding surface, the conduction surface is close to one side of the second conduction surface, the axial distance between each conduction surface and the first conduction surface gradually decreases along the direction from the light source light inlet surface to the circle center, the included angle formed by the tangent line of any point of the conduction surface and the first conduction surface is smaller than the included angle formed by the tangent line of any point of the guiding surface and the first conduction surface, the light beam of the light source is conducted and reflected between the conduction surface and the first conduction surface along the direction from the light source light inlet surface to the circle center, wherein the light beam reflected by the conduction surface and the first conduction surface form an alpha included angle, and the alpha included angle gradually increases along with the repeated reflection of the light beam on the conduction surface.
Further set up: the number of the guiding-out surfaces of the annular reflecting area is two, the inclination directions of the two adjacent guiding-out surfaces are opposite, and the ends of one sides of the two guiding-out surfaces far away from the conducting surface are connected through the connecting surface.
Further set up: the radial length of the guide surface gradually decreases along the direction from the light source light incident surface to the circle center.
Further set up: the distance between the highest point of the conducting surface and the leading-out surface of each annular reflecting area gradually increases along the direction from the light source light inlet surface to the circle center.
Further set up: the connecting surface is an arc surface or a plane.
Further set up: the connection surface and the guiding-out surface are in arc transition.
Further set up: the included angle formed by the tangent line of any point of the conducting surface and the first conducting surface is 0-15 degrees, and the included angle formed by the tangent line of any point of the guiding surface and the first conducting surface is 20-60 degrees.
Further set up: the guide surface continuously forms a curved surface or a spherical surface or a stepped surface on the same path on the second guide surface.
Further set up: the plate-shaped body is formed by rolling, compression molding or injection molding.
Further set up: and annular reflecting areas with the same rule are arranged on the first light guide surface.
The invention has the following beneficial effects:
1. arranging a point light source at the outer ring of the high-light-efficiency circular lamp, enabling the light source to enter the plate-shaped body from the outer ring, reflecting light rays between the first light guide surface and the second light guide surface, wherein a plurality of annular 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 the material 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 the circle center by the first light guide surface, and refracting the light rays out of the second light guide surface otherwise; with the same annular reflecting region 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-entering face of the light source and a smaller thickness at the center of the circle. In addition, 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 guide surface at the position of the low beam source is more than that of the position of the high beam source, and the distance between the guide surface of each annular reflection area and the highest point of the guide surface is sequentially increased along the direction from the circle center to the outer circle 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 circular light guide plate of uniform thickness;
FIG. 2 is a schematic view of the light output of a circular light guide plate of equal thickness in the prior art;
FIG. 3 is a schematic view of a high light efficiency circular luminaire of the present application;
FIG. 4 is a schematic view of a circular light guide plate of the present application;
fig. 5 is a top view of the circular light guide plate of the present application;
FIG. 6 is a detailed view of the annular reflective area of the circular light guide plate of the present application;
fig. 7 is a schematic view of the light output of the circular light guide plate of the present application.
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. a circular light guide plate; 10. a diffusion plate; 11. a reflective film; 12. an outer frame; 13. a light source.
Description of the embodiments
The present invention will be described in further detail with reference to the accompanying drawings.
Examples
A high-light-efficiency round lamp is shown in fig. 3, 1. The high-light-efficiency round lamp comprises an outer frame 12 and a round light guide plate 9 arranged on the outer frame 12, wherein a light source 12 is arranged on the side edge of the round light guide plate 9, a diffusion plate 10 is arranged on the front surface of the outer frame 12, and a reflecting film 11 is arranged on the back surface of the outer frame.
As shown in fig. 4, the circular light guide plate 9 includes a transparent plate-like body 1, and the plate-like body 1 is roll-formed, compression-formed, or injection-molded. The light source light incident surface 4 is arranged on the outer side of the circumference of the plate-shaped body 1, the light source 12 is a lamp bead, and the light source is arranged on the outer side of the circumference of the high-light-efficiency round lamp and used for providing the light source for the inner part of the plate-shaped body 1.
As shown in fig. 4 and 5, the plate-like body 1 includes a first light guide surface 2 and a second light guide surface 3 in both axial side directions, and a plurality of annular reflection regions 5 are arranged on the second light guide surface 3 in the radial direction of the plate-like body 1.
Since the annular reflective area 5 is a minute structure, the scale of the size of the individual components in fig. 5 is only referred to by way of enlarged fig. 5 as a schematic diagram showing the annular reflective area 5 in order to show the structure.
Referring to fig. 6, each annular reflection area 5 includes two inclined guide surfaces 6, and the inclined directions of the two guide surfaces 6 are opposite, so that in an ideal state, the two guide surfaces 6 may intersect at a point to form a V-shaped structure, so that the effect of the two guide 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 annular 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 annular reflection area 5 further comprises a conducting surface 8 connected with the guiding surface 6, the conducting surface 8 is close to one side of the second guiding surface 3, the axial distance between each conducting surface 8 and the first guiding surface 2 gradually decreases along the direction from the light source light-in surface 4 to the circle center, and an included angle formed by a tangent line at any point of the conducting 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 is continuously formed on the second guide surface 3 as a curved surface or a spherical surface or a stepped surface on the same path.
Based on the above arrangement, the light output of the high-light-efficiency circular 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 circular lamp in the prior art after the concave-convex V-shaped groove is arranged in fig. 1, the side of the high-light-efficiency circular 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 position of the high-light-efficiency circular lamp, and the right side is the farthest end of the light source in the light input position. After light enters the light guide plate from the side direction, the light emitted by each side light source reaches the position of the circle center in theory, and the light sources arranged on the circumference of the light guide plate just meet the overall brightness of the high-light-efficiency round lamp. Because of the light side penetrability, a larger part of the light source still penetrates through the center position after passing through the center, the reflection path of the light of the part is longer, even, a part of the 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, specifically, the outer ring of the high-light-efficiency circular lamp is thicker, and the center of the circle 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 circle center position is thinner, the light guiding efficiency is inversely proportional to the thickness of the light guide plate, the thinner the thickness of the circle center position is, the higher the light guiding efficiency is, and the 50% guiding efficiency of the light guide plate with the same 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 center position of the high-light-efficiency round 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 conducting surface 8 of each annular reflecting 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 circle center. 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 application not only reduces the use of materials and has great economic benefit, but also is more beneficial to the light guiding-out than the traditional light guide plate.
Embodiment 2 differs from embodiment 1 in that the same regular annular reflective area 5 is arranged on the first light guiding 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 (9)
1. The utility model provides a high light efficiency circular lamp, includes frame (12), installs circular light guide plate (9) on frame (12), and the side of circular light guide plate (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), circular light guide plate (9) include transparent platelike body (1), its characterized in that, platelike body (1) include first leaded light face (2) and second leaded light face (3) in axial both sides orientation, light source income plain noodles (4) outside circumference, and the light source is arranged in the circumference outside of high light efficiency circular lamp;
The second light guide surface (3) is provided with a plurality of annular reflecting areas (5) which are sequentially distributed along the radial direction, the annular reflecting areas (5) comprise light guide surfaces (6) which respectively form included angles with the light source light inlet surface (4) and the first light guide surface (2), the light guide surfaces (6) are obliquely arranged relative to the first light guide surface (2), light beams of the light source are emitted into the light guide surfaces (6) through the light source light inlet surface (4) and are refracted or reflected to be led out, and the plurality of light guide surfaces (6) jointly control the light guiding rate of the light emitted into the light source light inlet surface (4);
The annular reflection area (5) further comprises a conduction surface (8) connected with the guide surface (6), the conduction surface (8) is close to one side of the second light guide surface (3), the axial distance between each conduction surface (8) and the first light guide surface (2) gradually decreases along the direction from the light source light inlet surface (4) to the circle center, the included angle formed by the tangent line of any point of the conduction surface (8) and the first light guide surface (2) is smaller than the included angle formed by the tangent line of any point of the guide surface (6) and the first light guide surface (2), the light beam of the light source is conducted and reflected between the conduction surface (8) and the first light guide surface (2) along the direction from the light source light inlet surface (4) to the circle center, and the included angle alpha between the light beam reflected by the conduction surface (8) and the first light guide surface (2) gradually increases along with multiple reflections of the light beam on the conduction surface (8);
the distance between the conducting surface (8) of each annular 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 circle center.
2. The high light efficiency circular luminaire of claim 1, wherein: the number of the guiding-out surfaces (6) of the annular reflection area (5) is two, the inclination directions of two adjacent guiding-out surfaces (6) are opposite, and the ends of the two guiding-out surfaces (6) on one side far away from the guiding-out surface (8) are connected through the connecting surface (7).
3. The high light efficiency circular luminaire of claim 1, wherein: the radial length of the conducting surface (8) gradually decreases along the direction from the light source light-in surface (4) to the circle center.
4. A high light efficiency circular luminaire as claimed in claim 3, characterized in that: the connecting surface (7) is an arc surface or a plane.
5. The high light efficiency circular light fixture of claim 4, wherein: the connection surface (7) and the guide-out surface (6) are arranged to form an arc transition.
6. The high light efficiency circular luminaire of claim 1, wherein: 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.
7. The high light efficiency circular luminaire of claim 1, wherein: the conducting surface (8) continuously forms a curved surface or a spherical surface or a stepped surface on the same path on the second conducting surface (3).
8. The high light efficiency circular luminaire of claim 1, wherein: the plate-shaped body (1) is formed by rolling, compression molding or injection molding.
9. The high light efficiency circular luminaire of claim 1, wherein: the first light guide surface (2) is provided with annular reflecting areas (5) with the same rule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810486537.1A CN108561806B (en) | 2018-05-15 | 2018-05-15 | High light effect round lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810486537.1A CN108561806B (en) | 2018-05-15 | 2018-05-15 | High light effect round lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108561806A CN108561806A (en) | 2018-09-21 |
| CN108561806B true CN108561806B (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810486537.1A Active CN108561806B (en) | 2018-05-15 | 2018-05-15 | High light effect round lamp |
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| CN (1) | CN108561806B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1567050A (en) * | 2003-07-04 | 2005-01-19 | 鸿富锦精密工业（深圳）有限公司 | Surface luminous source apparatus |
| CN208253300U (en) * | 2018-05-15 | 2018-12-18 | 杭州矽能新材料有限公司 | High photosynthetic efficiency circular luminaire |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011134164A1 (en) * | 2010-04-30 | 2011-11-03 | Pan Dingguo | Light guide plate with micro prisms, manufacture methode thereof and plate-shape lamp and plate-shape lamp fixture made thereby |
-
2018
- 2018-05-15 CN CN201810486537.1A patent/CN108561806B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1567050A (en) * | 2003-07-04 | 2005-01-19 | 鸿富锦精密工业（深圳）有限公司 | Surface luminous source apparatus |
| CN208253300U (en) * | 2018-05-15 | 2018-12-18 | 杭州矽能新材料有限公司 | High photosynthetic efficiency circular luminaire |
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| Publication number | Publication date |
|---|---|
| CN108561806A (en) | 2018-09-21 |
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