CN207921869U - A kind of LED blackboard lights - Google Patents
A kind of LED blackboard lights Download PDFInfo
- Publication number
- CN207921869U CN207921869U CN201820046248.5U CN201820046248U CN207921869U CN 207921869 U CN207921869 U CN 207921869U CN 201820046248 U CN201820046248 U CN 201820046248U CN 207921869 U CN207921869 U CN 207921869U
- Authority
- CN
- China
- Prior art keywords
- blackboard
- light
- led
- incidence
- optical lens
- Prior art date
- 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.)
- Active
Links
Landscapes
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
The utility model belongs to lighting technical field, specially a kind of LED blackboard lights.Its structure includes lamp housing, LED lamp bead, PCB circuit board, optical lens, plastic face mask；Wherein, LED lamp bead, PCB circuit board, optical lens, plastic face mask form optics module, and placement is fixed in the groove inside lamp housing；Optical lens is in strip, is made of the plane of incidence, light-emitting surface and two different side inner total reflection faces；The utility model is directed to the position characteristics of blackboard and lamps and lanterns, secondary light-distribution design is carried out to LED by optical lens, lens use more free-form surface lens forms, the energy for being sent out LED light source by way of refraction and inner total reflection is all collected, redistribution is so to projecting on blackboard surface, the illuminating effect for realizing optically focused and polarisation, is greatly improved the utilization rate of luminous energy, while keeping the higher uniformity on blackboard surface.The blackboard lights are simple in structure, have higher practicability.
Description
Technical field
The utility model belongs to lighting technical field, and in particular to a kind of LED blackboard lights.
Background technology
Blackboard is most common stage property in usual education activities and show activity.Blackboard itself does not send out light, needs to reflect
Then the light that environment and lamps and lanterns are sent out is perceived by the human eye.The application environment of blackboard is various, in the case that ambient light is bad, just
It needs to be compensated with blackboard lights.So the optical design of blackboard lights directly affects the uniformity of blackboard, human eye is then influenced
Observation.
The fluorescent lamp that traditional blackboard lights use is as lighting system, and illumination has that efficiency is low, and blackboard uneven illumination is even,
The shortcomings of blackboard lower half portion illumination is apparent relatively low, dazzle is serious, containing mercury, during being currently phased out.LED conducts
Solid-state lighting light source gradually occupies most of illumination market, and compared to having big advantage with fluorescent lamp.Use LED light source
Blackboard lights have huge optical design space compared to fluorescent tube, key reflections formula and lens type at present.It is reflective opposite and
Say the disadvantages such as structure is huge, and entirety is high to reflecting surface processing request, and whole optical efficiency is low.CN200710049769 discloses one
The blackboard lights of kind dual reflector, entire lamp body include two fluorescent lamps and two paraboloids, and the irradiating angle of light source is not
Together, two reflectors respectively with blackboard at an angle, be responsible for lightening blackboard different zones.The optics side of lens type blackboard lights
Case is not very ripe, is occurred mostly in the form of wall lamp, and the special circumstances of blackboard illumination are unsatisfactory for, and secondary light is realized using lens
Learning design has huge design room for improvement.
Invention content
The LED blackboards that the purpose of this utility model is to provide a kind of uniformities is good, dazzle is low, efficiency is high, compact-sized
Lamp.
The LED blackboard lights of the utility model design, for the position characteristics of blackboard and lamps and lanterns, by optical lens to LED
Lamp bead array carries out secondary light-distribution design, and the optical lens uses the form of lens of more free form surfaces, by reflecting, being totally reflected
Mode the light that LED lamp bead array is sent out all is collected and is redistributed by optical system, project blackboard surface
On, it realizes the illuminating effect of optically focused and polarisation, the utilization rate of luminous energy is greatly improved, while keeping higher uniform on blackboard surface
Degree.
The utility model design LED blackboard lights, structure include lamp housing, LED lamp bead, PCB circuit board, optical lens,
Plastic face mask；Wherein, LED lamp bead, the optics module of PCB circuit board, optical lens, plastic face mask composition LED blackboard lights, lamp housing
It is internally provided with groove, for placing the fixed optics module.
In the optics module, LED lamp bead is welded in PCB circuit board, is in array distribution；Optical lens is mounted on LED
Above lamp bead array, LED lamp bead is located at below the geometric center of optical lens；Plastic face mask is mounted on the opening of lamp housing, uses
In the entire optical system of closing.
In the LED blackboard lights, the LED lamp bead array and PCB circuit board constitute LED light source board module, LED lamp bead
Array (having plurality of LEDs lamp bead) is arranged (i.e. linear homogeneous arranges) along light source board block length direction with identical spacing, described
Spacing can be adjusted with different application scenarios demands.Linear homogeneous arrangement contributes to blackboard lights illumination on blackboard
Transverse regularity also can avoid human eye and directly observe lamps and lanterns and generate dazzling sense.The LED light source board module relative to blackboard surface at
Slant setting, and be slightly toward below blackboard, so that blackboard lower half portion is obtained more energy, can suitably reduce optics and set
The difficulty of meter.
In the LED blackboard lights, the optical lens is in strip, is made of following several curved surfaces：The plane of incidence, light extraction
Face and two different side inner total reflection faces；Wherein, the plane of incidence includes the front plane of incidence and the side plane of incidence, forms groove
Shape, LED lamp bead array are located in groove, LED lamp bead light-emitting surface right opposite normal incidence face；The side plane of incidence and light-emitting surface are basic
Plane, the front plane of incidence, side inner total reflection face are free form surface.Lens are whole to be extended along blackboard longitudinal direction, LED lamp bead
The light of array outgoing is limited by lens, and the light of all outgoing is all limited within the scope of special angle, i.e., vertical
In on the longitudinal direction of blackboard, light is eventually restricted from the face where blackboard, and reaches certain uniformity；And along blackboard cross
To on direction, light transmit it is unrestricted, be conducive to light blackboard horizontal direction diffusion profile.
In the LED blackboard lights, the light sent out from LED lamp bead array is divided into three accesses, is finally put down where blackboard
Face forms the height concentrated and is uniformly distributed.First access is realized by the front plane of incidence of the optical lens, the front
The plane of incidence is free form surface, and the light being emitted from light source directly refracts to light-emitting surface by the front plane of incidence, is finally emitted to black
On plate, uniform-illumination on longitudinal direction is realized, in this light-path, optical lens mainly controls light in blackboard longitudinal direction
Light is distributed.Second and third access is realized by two different side inner total reflection faces and the side plane of incidence respectively, from LED light
The light of pearl outgoing is refracted to the side inner total reflection face of corresponding side from a side plane of incidence, is totally reflected and rolls over by inside
It is incident upon outer light-emitting surface, is finally emitted on blackboard, and limits genesis analysis of the light on blackboard by line, similarly LED lamp bead
Array is refracted to another corresponding side inner total reflection face by another side plane of incidence, is finally emitted on blackboard, shape
At another genesis analysis by line, to realize the light constraint on vertical blackboard direction.This three parts light is by outgoing
Smooth surface projects on blackboard surface, they are respectively radiated to the different location of blackboard longitudinal direction, and are overlapped mutually, and makes blackboard vertical
The uniform-illumination on direction.
Further, it is also possible to which the light-emitting surface in optical lens increases periodic microarray, referred to as micro-structure, further increase
Blacken the uniformity of illuminance in plate face.The micro-structure is that the optics of periodic arrangement is micro- for entire optical surface
Member, simplest micro-structure are intercepted by sphere, with the radius of curvature of sphere and the height of prominent optical surface come table
This infinitesimal is levied, periodic rule is characterized by parameter, that is, horizontal and vertical spacing of identical infinitesimal of periodic arrangement.
Micro-structure does not change on a large scale light distribution, its effect is to make light in original under the basic role of entire optical system
Some goes out in light distribution in more random distribution to blackboard, has in terms of improving the uniformity and dispersion and has certain effect, also may be used
Strong dazzling sense is caused to prevent human eye from directly observing lamps and lanterns.
Blackboard lights described in the utility model realize secondary optical design using free-form surface lens.Use free-form surface lens
As the blackboard lights of optical design, compared to the blackboard lights of reflected version, on the one hand more energy can be made more uniform
On the blackboard surface of projection；Another side can be effectively prevent under the premise of not needing more structures by the optical component of itself
Dazzle, structure size are small.Compared with existing lens type blackboard lights, LED blackboard lights described in the utility model, structure size is simpler
It is single, light and handy, by the special secondary optical design of lens and the microstructure design of light-emitting surface, uniformity is improved, is reduced
Dazzle.
Description of the drawings
Fig. 1 is the utility model lens type LED blackboard lights stereogram exploded views.
Fig. 2 is the index path of blackboard lights.
Fig. 3 is LED light source board figure.
Fig. 4 show the schematic diagram of the logical reflection method of light of blackboard lights lens design.
Fig. 5 is the index path of free-form surface lens
Fig. 6 is that partial differential solves the schematic diagram put on free form surface
Fig. 7 is the complete face type of LED lens.
Figure label：10 be LED light source board, and 20 be optical lens, and 30 be lamp housing, and 100 be LED blackboard lights, and 200 be blackboard
Face, 21 be the optical lens front plane of incidence, and 22 be optical lens side inner total reflection face, and 23 be the inner total reflection of optical lens side
Face, 24 be the outer light-emitting surface of optical lens.
Specific implementation mode
Fig. 1 is 100 stereogram exploded view of the utility model lens type LED blackboard lights, which is arranged in the lamp housing
Opposite blackboard is obliquely installed on 30, which is arranged in the LED light source board.How free 20 use of lens used is as shown in Figure 2
Toroidal lens form, the energy whole that light source is sent out by way of refraction and inner total reflection are collected, and redistribution is so to throwing
It is mapped on blackboard surface 200.As shown in Figure 3 by adjusting the arrangement distance D of LED on light source board 10, blackboard transverse direction side can be enhanced
Upward uniformity can also control exit luminous flux.
In the optical lens, Random Curved Surface Designing is led to reflection method calculating and solved partial differential equation using light to be obtained.
As shown in figure 4, it is the light for being emitted different angle that light, which leads to reflection method, pass through the corresponding of angle and location determination angle and target point
Relationship obtains the geometric parameter of free form surface, and light is led to geometrical relationship that reflection method obtains by solving partial differential equation, is obtained
The face type of free form surface.
The process for solving the face type that partial differential equation obtain free form surface is as follows：Known light leads to pair of reflection method θ-R
It should be related to the angle of light and design basis axis when θ=F (R), θ are design, R designs light and fallen by optical system for this to be shone
The position in target face is penetrated, each θ and R is to be defined and be arranged in advance.When illuminating effect does not reach requirement, according to
The ray tracing of model checks the distribution of plane of illumination, can specify improvement direction, then by adjusting correspondence θ=F (R)
It is designed, adjusts out light distribution.
θ1Corresponding R1, θ2Corresponding R2... etc., the θ-R of each design light meet correspondence θ=F (R).
For single free form surface partial differential equation method as shown in fig. 6, R is the position in target face, x and y are the free form surfaces
On the point to be solved position, θinTo design angle of incidence of light, θoutTo design the final angle of emergence of light.
Light is emitted from LED, is reflected by the point (x, y) on optical lens free form surface, using the refraction of plane
It reaches on light-emitting surface；If LED to optical lens bottom centre distance be d0, the center at the top of optical lens bottom to optical lens
Thickness is d1, the distance at optical lens top to target face is d2；a1For the angle of curved surface tangential direction and reference axis, a2And b1
Alternate interior angle, all angle for the light after superrefraction and reference axis, a are shown as in index path2=b1.N is the refraction of optical lens
Rate is determined by lens material.
From LED to target face, the expression formula of R is
R=x tan θin+(d0+d1-x)tanb1+d2tanθout (1)
Met according to geometrical relationship y and x：
Y=x tan θin (2)
To formula (2) θinDerivation is carried out, should be noted that x is also about θinFunction, therefore must take into consideration x in formula to θinIt is inclined
DerivativeSame treatment is done with y in this way, can be obtained：
Formula includesWithTwo the unknowns, so needing to be further simplified.
According to Si Nieer formulas, light meets in optical system：
According to the definition at curved surface inclination angle, puts and meet at (x, y)：
Again according to formula (4) and formula (5), can obtain：
By formula (3) and formula (6) simultaneous, x and θ are finally obtainedinRelationship：
By simultaneous, finally obtain about x and θinThe differential equation, solve the partial differential equation and generally require by calculating
Machine, it is known that θin=0 and x=d0It is the initial solution that equation solves.The physical significance of the differential equation is that, it is known that light-source angle
With target illumination situation, that is, correspondence of designer, the unique coordinate of free form surface also just uniquely determines, can be by asking
The method of solution partial differential equation obtains a series of coordinate points on free form surface.Then curve is linked to be to these coordinate points, is formed just
The model of beginning is simulated, and further according to directive adjusting θ=F (R) correspondence of analog result, solution obtains new model
It is simulated.It is to the partial differential equation of refraction similar, the solution of reflective portion also similar operations.
Partial differential equation method is to solve for mapping relations and limits lower physical quantity, passes through refraction, the simultaneous of Reflection formula and first
The determination of beginning condition obtains unique solution.But in this blackboard lights, LED sizes cannot be ignored, and lamps and lanterns are put relative to blackboard inclination
It sets, the lower half portion of blackboard is longer than the top half of blackboard at a distance from blackboard lights, this brings to accurately definition mapping relations
Inconvenience is calculated by the way that majorized function is arranged so needing the thought with iteration optimization in actual use, passes through iteration repeatedly
Optimization then obtains required face type and changes mapping relations θ1Corresponding R11, θ corresponds to R21Deng R11With R1Difference, R21With R2It is different.
Fig. 5 is the bus outline of blackboard lights lens, and the light being emitted from light source board 10 passes through 21 folding of normal incidence face respectively
It penetrates, side inner total reflection face 22 and side inner total reflection face 23 are reflected, and are finally emitted commonly through outer light-emitting surface 24, above-mentioned meaning
Free form surface be all to be solved by Partial Differential Equation method.This three parts is can be seen that by the ray tracing of each curved surface
Spatial light distribution be almost the same, so being mutually overlapping in distribution of the three parts on blackboard, so hot spot is opposite
The mapping relations of three parts separation, hot spot can be softer and be properly added in outer light-emitting surface and can be imitated with improving optical to dismiss
Fruit, it is final as shown in Figure 7.
Claims (3)
1. a kind of LED blackboard lights, which is characterized in that including lamp housing, LED lamp bead, PCB circuit board, optical lens, plastic cover
Cover；Wherein, LED lamp bead, PCB circuit board, optical lens, plastic face mask form the optics module of LED blackboard lights, are set inside lamp housing
Fluted, the optics module placement is fixed in the groove；
In the optics module, LED lamp bead is welded in PCB circuit board, is in array distribution；Optical lens is mounted on LED lamp bead
Above array, LED lamp bead is located at below the geometric center of optical lens；Plastic face mask is mounted on the opening of lamp housing, for sealing
Close entire optical system；
The LED lamp bead array and PCB circuit board constitute LED light source board module, and LED lamp beads array is along light source board block length
Dimension linear is evenly distributed；
The optical lens is in strip, is made of following several curved surfaces：It is complete in the plane of incidence, light-emitting surface and two different sides
Reflecting surface；Wherein, the plane of incidence includes the front plane of incidence and the side plane of incidence, forms groove-like, and LED lamp bead array is located at groove
It is interior, LED lamp bead light-emitting surface right opposite normal incidence face；The side plane of incidence and light-emitting surface are substantially planar, in the front plane of incidence, side
Fully reflecting surface is free form surface；Optical lens is whole to be extended along blackboard longitudinal direction, the light of LED lamp bead array outgoing by
The light of the limitation of lens, all outgoing is all limited within the scope of special angle, i.e., on the longitudinal direction perpendicular to blackboard,
Light is eventually restricted from the face where blackboard, and reaches certain uniformity；And on along blackboard horizontal direction, light transmits not
Be restricted, be conducive to light blackboard horizontal direction diffusion profile.
2. LED blackboard lights according to claim 1, which is characterized in that the light sent out from LED lamp bead array is divided into three
A access, the height that finally the plane formation where blackboard is concentrated are uniformly distributed；First access is by the optical lens
The front plane of incidence realizes that the light being emitted from light source directly refracts to light-emitting surface by the front plane of incidence, is finally emitted to blackboard
On, realize longitudinal direction on uniform-illumination, in this light-path, optical lens mainly control light blackboard longitudinal direction light
Line is distributed；Second and third access is realized by two different side inner total reflection faces and the side plane of incidence respectively, from LED lamp bead
The light of outgoing is refracted to the side inner total reflection face of corresponding side from a side plane of incidence, is refracted to by inside total reflection
Outer light-emitting surface, is finally emitted on blackboard, and limits genesis analysis of the light on blackboard by line, similarly LED lamp bead array
By another side, the plane of incidence is refracted to another corresponding side inner total reflection face, is finally emitted on blackboard, is formed another
One genesis analysis is by line, to realize the light constraint on vertical blackboard direction；This three parts light passes through outer light-emitting surface
It projects on blackboard surface, they are respectively radiated to the different location of blackboard longitudinal direction, and are overlapped mutually, and make blackboard in longitudinal side
Upward uniform-illumination.
3. LED blackboard lights according to claim 2, which is characterized in that increase periodically in the light-emitting surface of optical lens
Microarray, referred to as micro-structure further increases the uniformity of illuminance on blackboard surface；The micro-structure, relative to entire light
It is the optics infinitesimal of periodic arrangement for face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820046248.5U CN207921869U (en) | 2018-01-11 | 2018-01-11 | A kind of LED blackboard lights |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820046248.5U CN207921869U (en) | 2018-01-11 | 2018-01-11 | A kind of LED blackboard lights |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207921869U true CN207921869U (en) | 2018-09-28 |
Family
ID=63616380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820046248.5U Active CN207921869U (en) | 2018-01-11 | 2018-01-11 | A kind of LED blackboard lights |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207921869U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108302380A (en) * | 2018-01-11 | 2018-07-20 | 复旦大学 | A kind of lens type LED blackboard lights |
-
2018
- 2018-01-11 CN CN201820046248.5U patent/CN207921869U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108302380A (en) * | 2018-01-11 | 2018-07-20 | 复旦大学 | A kind of lens type LED blackboard lights |
| CN108302380B (en) * | 2018-01-11 | 2020-07-03 | 复旦大学 | Lens type LED blackboard lamp |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108302380B (en) | Lens type LED blackboard lamp | |
| CN203731285U (en) | Lens of LED (light emitting diode) street lamp used with LED light source provided with primary lens | |
| US7976201B2 (en) | Lens body equipped with a light emitting device capable of generating two-side illumination | |
| US20100073938A1 (en) | Two-side asymmetric light-shift illuminating lens body | |
| CN101956939A (en) | Lamp and lighting equipment | |
| CN101576231A (en) | Center light-splitting reflective optical unit and system, and manufacturing method thereof | |
| CN111503558A (en) | High degree of consistency L ED blackboard lamp lens of low coverage installation | |
| CN111023042A (en) | LED collimation optical lens | |
| CN107678152B (en) | LED free-form surface lens for optical microphotograph mirror reflection lighting system | |
| CN106500013A (en) | Projecting Lamp lens, light emitting module and Projecting Lamp | |
| CN103912809B (en) | Zigzag type LED illumination optical system | |
| CN209146833U (en) | A kind of automobile atmosphere lamp | |
| CN103388773B (en) | Sunshine spectral pattern LED eyeshield flat lamp | |
| CN207921869U (en) | A kind of LED blackboard lights | |
| US20120039076A1 (en) | Energy-saving lighting device with even distribution of light | |
| CN205824922U (en) | Projecting Lamp lens, the light emitting module with these Projecting Lamp lens and Projecting Lamp | |
| CN203363991U (en) | LED (light-emitting diode) secondary optical lens | |
| CN101936507B (en) | Reflector, lamp and illuminating equipment | |
| CN104501061A (en) | Design method of automobile headlamp reflector | |
| CN204512999U (en) | A kind of LED blackboard lights | |
| CN103104883A (en) | Light guiding lens and light emitting diode (LED) lamp | |
| CN110805857B (en) | Compound LED dodging system | |
| CN203757597U (en) | Light mixing lens | |
| CN202647592U (en) | Lens capable of achieving even rectangular facula | |
| CN202852574U (en) | A solar spectrum-type eye-protecting LED panel lamp or panel desk lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |