CN111706797A - Light health blackboard lamp - Google Patents
Light health blackboard lamp Download PDFInfo
- Publication number
- CN111706797A CN111706797A CN202010402291.2A CN202010402291A CN111706797A CN 111706797 A CN111706797 A CN 111706797A CN 202010402291 A CN202010402291 A CN 202010402291A CN 111706797 A CN111706797 A CN 111706797A
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- CN
- China
- Prior art keywords
- lamp
- plate
- strip
- light
- reflector
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- F21S8/03—Lighting devices intended for fixed installation of surface-mounted type
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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
- F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
-
- 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
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/71—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
- F21V29/717—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements using split or remote units thermally interconnected, e.g. by thermally conductive bars or heat pipes
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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
- F21V31/00—Gas-tight or water-tight arrangements
-
- 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
- F21V5/08—Refractors for light sources producing an asymmetric light distribution
-
- 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
- F21V7/00—Reflectors for light sources
- F21V7/10—Construction
Abstract
The invention discloses a light health blackboard lamp which comprises a lamp body section, a full reflector, a top diffusion plate, a lamp strip, a bottom diffusion plate and a radiator, wherein the top diffusion plate, the full reflector, the lamp strip, the bottom diffusion plate and the radiator are fixedly arranged in the lamp body section, the lamp body section comprises two long strip-shaped side plates and two arc-shaped side plates, the two arc-shaped side plates are protruded to form a full reflector mounting plate, the full reflector is mounted in the full reflector mounting plate, and the two long strip-shaped side plates are respectively positioned on two sides of the arc-shaped side plates. According to the invention, through the optical angle design of the full reflector, the ultra-short irradiation distance is satisfied, so that the uniformity of the illumination of the blackboard lamp for blackboard illumination is better, the lateral visual comfort degree is effectively improved, the lateral glare value is effectively reduced, the up-down light emitting is satisfied by using a lamp strip (namely, the backlight is increased on the basis of main light emitting), and the structure is simple and practical.
Description
Technical Field
The invention relates to the technical field of illumination, in particular to a light health blackboard lamp.
Background
With the continuous development of science and technology, the requirements of people on various articles for daily use are gradually improved, the proportion of myopia in students is higher and higher at present, and people pay more and more attention to the vision problems of teenagers. The blackboard is one of the important reasons influencing the eyesight of students, and if the illumination on the blackboard is uneven and the glare value is high, the visual fatigue of the students is easily caused, and discomfort is generated. The harmful effects caused by glare mainly destroy dark adaptation and generate a visual afterimage; reducing the illumination on the retina; weakening the contrast of the observed object with the background; the fuzzy feeling and the like are generated when the student observes the object, and the fuzzy feeling and the like influence the student to normally learn.
And the blackboard lamp on the existing market, it is direct to be equipped with a plurality of LED lamp in the top of blackboard usually, it is equipped with the bowl again to cover on the lamp, the blackboard lamp is installed in mr's top before the top, the blackboard lamp of this kind of structure has direct beam light to get into mr's eyes, consequently, cause mr's visual fatigue easily, only can satisfy the light-emitting requirement of shining on the blackboard face, do not possess the light-emitting of lamps and lanterns on the ceiling, and the light-emitting mode of blackboard lamp adopts lens to satisfy the grading requirement mostly, and the blackboard lamp is far away at the horizontal direction distance blackboard face, can not satisfy the optical design requirement of closely blackboard.
For example, an LED blackboard lamp (publication No. CN 201920061163.9) disclosed in the Chinese patent document includes: the LED blackboard lamp comprises an LED lamp holder, an LED lamp tube and a reflecting cover, wherein the LED lamp holder is connected with the LED lamp tube and the reflecting cover, the LED lamp tube is arranged in the reflecting cover, at least part of light emitted by the LED lamp tube directly irradiates a blackboard, and the LED blackboard lamp cannot meet the requirements of upper and lower light emission and the optical design requirement of a short-distance blackboard.
Disclosure of Invention
The invention aims to overcome the technical problems that the illuminance uniformity of a blackboard lamp for blackboard illumination is poor, glare easily occurs, upper and lower light emitting cannot be met, the optical design requirement of a short-distance blackboard cannot be met, dust is easily adsorbed on a lamp source in the process of using long-time chalk, and illumination is affected in the prior art, and provides an optical health blackboard lamp.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a healthy blackboard lamp of light, the blackboard lamp includes lamp body section bar, total reflector, top diffuser plate, lamp strip, bottom diffuser plate and radiator, top diffuser plate, total reflector, lamp strip, bottom diffuser plate and radiator all set firmly in the lamp body section bar, the lamp body section bar includes two rectangular shape curb plates and two convex curb plates, the protruding full reflector mounting panel that forms on two convex curb plates, the total reflector is installed in the total reflector mounting panel, two rectangular shape curb plates are located the both sides of convex curb plate respectively.
According to the scheme of the invention, the optical angle design is carried out on the full reflector, the ultra-short irradiation distance is met, so that the uniformity of the illumination of the blackboard lamp for blackboard illumination is better, the lateral visual comfort degree is effectively improved, the lateral glare value is effectively reduced, the up-down light emitting is met by using a lamp strip (namely, the backlight is increased on the basis of main light emitting), and the structure is simple and practical.
Preferably, the lamp body section bar comprises a limiting plate, the limiting plate is fixedly arranged at the top of the arc-shaped side plate, and the strip-shaped side plate and the arc-shaped side plate are fixedly connected through the limiting plate.
Preferably, a first limiting sliding groove is formed in the limiting plate, an opening of the first limiting sliding groove faces upwards, the top diffusion plate is embedded into the first limiting sliding groove, and a top light transmission groove is formed in the top diffusion plate.
Preferably, the total reflector is composed of two symmetrical arc reflecting surfaces, and a plurality of arc grid type baffles are fixedly arranged in a cavity composed of the two symmetrical arc reflecting surfaces. The uniform grid type baffle is added in the full reflector, so that the anti-dazzle effect of the grid is increased while the lateral anti-dazzle capability is effectively increased.
Preferably, the bottom light-transmitting groove is formed in the bottom of the full reflector, the radiator comprises a heat dissipation strip, a heat dissipation strip fixing position is arranged on the arc-shaped grating type baffle, and the heat dissipation strip is fixed on the full reflector in an inverted mode.
Preferably, the two strip-shaped side plates comprise a first strip-shaped side plate and a second strip-shaped side plate, a first groove is formed in the first strip-shaped side plate, a second groove corresponding to the first groove is formed in the second strip-shaped side plate, and two ends of the bottom diffusion plate are embedded in the first groove and the second groove respectively.
Preferably, one end of the radiator is connected with the full reflector through the fixing position of the heat dissipation strip, the other end of the radiator is embedded in the middle of the bottom diffusion plate, and the light bar is fixed on the full reflector through the heat dissipation strip.
Preferably, an electrostatic ring is provided on a lower end surface of the bottom diffuser plate.
The invention has the beneficial effects that: the blackboard lamp that is used for the blackboard illumination among the prior art illumination homogeneity is relatively poor, the glare appears easily, and can't satisfy light-emitting from top to bottom, can't satisfy the technical problem of the optical design requirement of blackboard closely, light-emitting from top to bottom satisfies, increase on main luminous basis and be shaded, effectively reduce side direction glare value, adopt the full reflector of hidden grid formula segmentation design, effectively promote side direction vision comfort level, the light source that makes the projection blackboard is more even, soft, the various luminance uniformity of blackboard is good, the electrostatic ring has been increased in addition, can reduce the absorption of dust on the lamp source, reduce the influence to the blackboard lamp illumination.
Drawings
FIG. 1 is a schematic sectional view of a blackboard lamp assembly according to the present invention.
Fig. 2 is a detailed view of a lamp body profile according to the present invention.
Fig. 3 is a detailed schematic diagram of a reflector in the present invention.
Fig. 4 is a schematic diagram of a light distribution test of a lamp according to the present invention.
Fig. 5 is a diagram showing a simulation result of blackboard illumination of a lamp in the present invention.
Fig. 6 is a schematic diagram of a lamp of the present invention having an upward light extraction (backlight).
Fig. 7 is a UGR value comparison diagram without light emission in the present invention.
In the figure: 1. the lamp body comprises a lamp body section, 101, a limiting plate, 101A, a first limiting sliding groove, 102, a first long strip-shaped side plate, 102A, a first groove, 103, a second long strip-shaped side plate, 103A, a second groove, 2, a full reflector, 201, a full reflector mounting plate, 202, an arc reflecting surface, 203, an arc grid type baffle, 204, a bottom light transmission groove, 3, a top diffusion plate, 301, a top light transmission groove, 4, a light bar, 5, a bottom diffusion plate, 6, a radiator, 601, a heat dissipation strip fixing position and 7, an electrostatic ring.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example 1: the healthy blackboard lamp of light of this embodiment, as shown in fig. 1, the blackboard lamp includes lamp body section bar 1, total reflector 2, top diffuser plate 3, lamp strip 4, bottom diffuser plate 5 and radiator 6, top diffuser plate 3, total reflector 2, lamp strip 4, bottom diffuser plate 5 and radiator 6 all set firmly in lamp body section bar 1, lamp body section bar 1 includes two rectangular shape curb plates and two convex curb plates, the protruding formation total reflector mounting panel 201 on two convex curb plates, total reflector 2 is installed in total reflector mounting panel 201, two rectangular shape curb plates are located the both sides of convex curb plate respectively.
The lamp body section bar 1 comprises a limiting plate 101, the limiting plate 101 is fixedly arranged at the top of the arc-shaped side plate, and the strip-shaped side plate and the arc-shaped side plate are fixedly connected through the limiting plate 101.
The lower terminal surface of bottom diffuser plate 5 is provided with static ring 7, and the static ring can be dismantled, can regularly take off cleanly, and static epoxy dope layer is prevented in static ring surface coating, and in blackboard lamp daily use, the dust can adsorb on the static ring, prevents effectively that the dust from getting into inside the blackboard lamp, causes the influence to lamp strip light source intensity, prolongs the life of blackboard lamp.
As shown in fig. 2, a first limiting sliding groove 101A is formed in the limiting plate 101, an opening of the first limiting sliding groove 101A faces upward, the top diffusion plate 3 is embedded into the first limiting sliding groove 101A, and a top light-transmitting groove 301 is formed in the top diffusion plate 3.
The two elongated side plates comprise a first elongated side plate 102 and a second elongated side plate 103, a first groove 102A is formed in the first elongated side plate 102, a second groove 103A corresponding to the first groove 102A is formed in the second elongated side plate 103, and two ends of the bottom diffusion plate 5 are embedded in the first groove 102A and the second groove 103A respectively.
As shown in fig. 3, the total reflector 2 is composed of two symmetrical arc-shaped reflecting surfaces 202, and a plurality of arc-shaped grid-type baffles 203 are fixedly arranged in a cavity composed of the two symmetrical arc-shaped reflecting surfaces 202. The uniform grid type baffle is added in the full reflector, so that the anti-dazzle effect of the grid is increased while the lateral anti-dazzle capability is effectively increased.
Bottom light trap 204 has been seted up to full reflector 2 bottom, and radiator 6 includes the heat dissipation strip, is equipped with heat dissipation strip fixed position 601 on the arc grid formula baffle, and the heat dissipation strip is fixed on full reflector 2 with the mode of flip-chip.
One end of the radiator 6 is connected with the full reflector 2 through the radiating strip fixing position 601, the other end of the radiator is embedded in the middle of the bottom diffusion plate 5, and the lamp strip 4 is fixed on the full reflector 2 through the radiating strip.
The full reflector adopts the mirror surface plating mode of highlight efficient, fixes lamp strip and radiator on the full reflector, and when the user need use the blackboard lamp, the lamp strip circular telegram, the light source reflects through the full reflector plane of reflection to see through the diffuser plate and form main light emitting area. Because there is some reflection blind areas in the bottom of full reflector, the bottom light trap of reflector bottom can directly see through the full reflector with the light of this part reflection blind area, and the light that the reflector bottom was seen through sees through lamp body top light trap, simultaneously through the top diffuser plate of lamp body section bar to it is luminous to form the lamp body top.
When the main light emitting surface fixes the light bar by the heat dissipation strip, a good radiator effect can be provided, the main light emitting surface can be divided into two parts, the surface brightness of the main light emitting surface is reduced, the uniformity of the light emitting surface is improved, and the light source is uniformly projected in a blackboard area.
In order to verify the effect of the blackboard lamp of the present embodiment, experiments were performed on the blackboard lamp, and the experimental results are shown in fig. 4, 5, 6, and 7. As shown in fig. 6, UGR values at two ends of the blackboard without backlight are lower than 10, but glare influence still exists; as shown in fig. 7, when there is backlight, UGR values at two ends of the blackboard do not exist, that is, there is no glare effect.
Experiments show that the blackboard lamp of the embodiment meets the requirement of ultra-short irradiation distance by the optical angle design of the full reflector, so that the horizontal distance from the blackboard lamp is less than 30 cm; meanwhile, asymmetric light distribution is adopted, so that the light source is distributed at a large angle in a 0-180-degree direction and at a narrow angle in a 90-270-degree direction, the average illumination intensity of the blackboard is maintained to be more than 600lux, and the illumination uniformity is more than 0.8.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a healthy blackboard lamp of light, its characterized in that, the blackboard lamp includes lamp body section bar (1), total reflector (2), top diffuser plate (3), lamp strip (4), bottom diffuser plate (5) and radiator (6), top diffuser plate (3), total reflector (2), lamp strip (4), bottom diffuser plate (5) and radiator (6) all set firmly in lamp body section bar (1), lamp body section bar (1) includes two rectangular shape curb plates and two convex curb plates, protruding formation total reflector mounting panel (201) on two convex curb plates, total reflector (2) are installed in total reflector mounting panel (201), two rectangular shape curb plates are located the both sides of convex curb plate respectively.
2. A light health blackboard lamp according to claim 1, wherein the lamp body section bar (1) includes a limiting plate (101), the limiting plate (101) is fixed on the top of the arc side plate, and the long strip side plate and the arc side plate are fixedly connected through the limiting plate (101).
3. A light health blackboard lamp according to claim 2, wherein the limiting plate (101) is provided with a first limiting chute (101A), the opening of the first limiting chute (101A) faces upward, the top diffusion plate (3) is embedded into the first limiting chute (101A), and the top diffusion plate (3) is provided with a top light-transmitting groove (301).
4. A light health blackboard lamp as claimed in claim 1, characterized in that the full reflector (2) is composed of two symmetrical arc reflecting surfaces (202), and a plurality of arc grid type baffles (203) are fixed in the cavity composed of the two symmetrical arc reflecting surfaces (202).
5. A light health blackboard lamp as claimed in claim 1 or 4, characterized in that the bottom of the full reflector (2) is opened with a bottom light-transmitting groove (204), the heat sink (6) includes a heat dissipating strip, the arc grid type baffle (203) is provided with a fixing position (601) of the heat dissipating strip, and the heat dissipating strip is fixed on the full reflector (2) in an upside-down manner.
6. A light health blackboard lamp according to claim 1, characterized in that the two long bar-shaped side plates include a first long bar-shaped side plate (102) and a second long bar-shaped side plate (103), the first long bar-shaped side plate (102) is provided with a first groove (102A), the second long bar-shaped side plate (103) is provided with a second groove (103A) corresponding to the first groove (102A), and two ends of the bottom diffusion plate (5) are embedded in the first groove (102A) and the second groove (103A), respectively.
7. A light health blackboard lamp as claimed in claim 5, wherein the heat sink (6) is connected to the full reflector (2) at one end through a fixing position (601) of the heat sink strip, and the other end is embedded in the middle of the bottom diffuser plate (5), and the light bar (4) is fixed to the full reflector (2) through the heat sink strip.
8. A light health blackboard lamp according to claim 1, characterized in that the lower end face of the bottom diffuser plate (5) is provided with an electrostatic ring (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010402291.2A CN111706797A (en) | 2020-05-13 | 2020-05-13 | Light health blackboard lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010402291.2A CN111706797A (en) | 2020-05-13 | 2020-05-13 | Light health blackboard lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111706797A true CN111706797A (en) | 2020-09-25 |
Family
ID=72537306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010402291.2A Pending CN111706797A (en) | 2020-05-13 | 2020-05-13 | Light health blackboard lamp |
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| CN (1) | CN111706797A (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06328895A (en) * | 1993-05-20 | 1994-11-29 | Fujita Corp | Internal illuminating blackboard |
| CN201803164U (en) * | 2010-08-20 | 2011-04-20 | 奉化市国盛仪表有限公司 | Novel grille lamp |
| JP2014099285A (en) * | 2012-11-13 | 2014-05-29 | Aoi Kokuban Seisakusho:Kk | Blackboard device |
| CN205807088U (en) * | 2016-06-03 | 2016-12-14 | 深圳市九洲光电科技有限公司 | A kind of blackboard lights |
| CN107620895A (en) * | 2017-09-21 | 2018-01-23 | 常州市元智汇电子有限公司 | The anti-dazzle blackboard lightses of LED |
| CN107917367A (en) * | 2017-12-01 | 2018-04-17 | 浙江凯耀照明股份有限公司 | A kind of blackboard lights |
| CN207471374U (en) * | 2017-11-27 | 2018-06-08 | 善研光电科技（上海）有限公司 | A kind of LED illuminating lamp for classroom blackboard |
| CN207661624U (en) * | 2017-12-25 | 2018-07-27 | 浙江永耀灯饰有限公司 | A kind of blackboard lights |
| CN208268861U (en) * | 2017-12-12 | 2018-12-21 | 漳州立达信光电子科技有限公司 | A kind of panel light and classroom lamp of double-side |
| CN110388599A (en) * | 2019-09-03 | 2019-10-29 | 浙江格瑞普光电科技有限公司 | A kind of blackboard lights anti-dazzle light reflecting board and its blackboard lights |
| CN209856900U (en) * | 2019-07-11 | 2019-12-27 | 江苏新广联光电股份有限公司 | Grid anti-dazzle classroom lamp with upper lighting function |
| CN209926106U (en) * | 2019-06-03 | 2020-01-10 | 广东视康照明科技有限公司 | Classroom lamp |
| CN210004236U (en) * | 2019-07-09 | 2020-01-31 | 中山市元登系统照明工业有限公司 | Layout structure of blackboard lamps |
| CN212617810U (en) * | 2020-05-13 | 2021-02-26 | 浙江凯耀照明有限责任公司 | Blackboard lamp |
-
2020
- 2020-05-13 CN CN202010402291.2A patent/CN111706797A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06328895A (en) * | 1993-05-20 | 1994-11-29 | Fujita Corp | Internal illuminating blackboard |
| CN201803164U (en) * | 2010-08-20 | 2011-04-20 | 奉化市国盛仪表有限公司 | Novel grille lamp |
| JP2014099285A (en) * | 2012-11-13 | 2014-05-29 | Aoi Kokuban Seisakusho:Kk | Blackboard device |
| CN205807088U (en) * | 2016-06-03 | 2016-12-14 | 深圳市九洲光电科技有限公司 | A kind of blackboard lights |
| CN107620895A (en) * | 2017-09-21 | 2018-01-23 | 常州市元智汇电子有限公司 | The anti-dazzle blackboard lightses of LED |
| CN207471374U (en) * | 2017-11-27 | 2018-06-08 | 善研光电科技（上海）有限公司 | A kind of LED illuminating lamp for classroom blackboard |
| CN107917367A (en) * | 2017-12-01 | 2018-04-17 | 浙江凯耀照明股份有限公司 | A kind of blackboard lights |
| CN208268861U (en) * | 2017-12-12 | 2018-12-21 | 漳州立达信光电子科技有限公司 | A kind of panel light and classroom lamp of double-side |
| CN207661624U (en) * | 2017-12-25 | 2018-07-27 | 浙江永耀灯饰有限公司 | A kind of blackboard lights |
| CN209926106U (en) * | 2019-06-03 | 2020-01-10 | 广东视康照明科技有限公司 | Classroom lamp |
| CN210004236U (en) * | 2019-07-09 | 2020-01-31 | 中山市元登系统照明工业有限公司 | Layout structure of blackboard lamps |
| CN209856900U (en) * | 2019-07-11 | 2019-12-27 | 江苏新广联光电股份有限公司 | Grid anti-dazzle classroom lamp with upper lighting function |
| CN110388599A (en) * | 2019-09-03 | 2019-10-29 | 浙江格瑞普光电科技有限公司 | A kind of blackboard lights anti-dazzle light reflecting board and its blackboard lights |
| CN212617810U (en) * | 2020-05-13 | 2021-02-26 | 浙江凯耀照明有限责任公司 | Blackboard lamp |
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Application publication date: 20200925 |