CN207569627U - A kind of LED blackboard lights of high evenness - Google Patents
A kind of LED blackboard lights of high evenness Download PDFInfo
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- CN207569627U CN207569627U CN201720862419.7U CN201720862419U CN207569627U CN 207569627 U CN207569627 U CN 207569627U CN 201720862419 U CN201720862419 U CN 201720862419U CN 207569627 U CN207569627 U CN 207569627U
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Abstract
The utility model is related to a kind of LED blackboard lights of high evenness, it includes the blackboard lights main body with lamp body outline border, power supply, PCB circuit board and optical lens, LED light distributions are lambert's body that half light intensity angle is 120 °, distribution curve flux C0/C180 faces, which are denoted as, is parallel to blackboard surface, and distribution curve flux C90/C270 faces are denoted as perpendicular to blackboard surface；Optical lens includes lens inner cavity top-surface camber, lens exit facet, and lens exit facet is using the center of LED light-emitting surfaces as the arc surface of origin；The minimum range of lens inner cavity top-surface camber and LED light-emitting surfaces is set, calculates the contour line of lens inner cavity top-surface camber section；Half light intensity angles of LED are 120 degree, wherein 100 degree of light is projected via lens inner cavity top-surface camber, lens exit facet；The light that remaining 20 degree of half light intensity angles of LED, through the first lens inner cavity side and the second lens inner cavity side, when the first reflecting surface of directive, the second reflecting surface, is totally reflected, and is finally projected via lens exit facet and reflects injection；Through above-mentioned processing, the C90/C270 faces of final distribution curve flux are obtained.
Description
Technical field
The utility model is related to a kind of lamps and lanterns, more particularly, to a kind of LED blackboard lights of high evenness.
Background technology
Blackboard lights are essential in teaching process, and under conditions of light is bad, blackboard lights are used to provide good regard
Feel environment, ensure writing and reading of the Faculty and Students on blackboard.The blackboard illumination of high quality will ensure the conjunction of vertical illumination
Reason, the uniformity is high, and installation site is suitable, and does not generate non-comfort glare.Traditional blackboard lights typically just use fluorescent lamp
Pipe, the blackboard lights are relatively near apart from blackboard above, away from blackboard lower section farther out so that the illumination of blackboard lights surface from top to bottom gradually declines
Subtract, and the illumination average value on blackboard surface is relatively low, this allows for existing blackboard lights, and there are the shortcomings that illumination is inadequate, the uniformity is low.
Invention content
The utility model main purpose is to provide a kind of LED blackboard lights of high evenness, with preferable vertical illumination
The uniformity.
The above-mentioned technical problem of the utility model is mainly what is be addressed by following technical proposals：A kind of high evenness
LED blackboard lights, including the blackboard lights main body with lamp body outline border, power supply, PCB circuit board and optical lens, blackboard lights main body
Set on blackboard front upper place, LED light source is welded in PCB circuit board, and optical lens is mounted in PCB circuit board；
1) LED light distributions are lambert's body that half light intensity angle is 120 °, and distribution curve flux C0/C180 faces, which are denoted as, is parallel to blackboard surface,
Distribution curve flux C90/C270 faces are denoted as perpendicular to blackboard surface；
2) optical lens include lens inner cavity top-surface camber, lens exit facet, lens exit facet be using LED light-emitting surfaces center as
The arc surface of origin；The minimum range of lens inner cavity top-surface camber and LED light-emitting surfaces is set, lens inner cavity is acquired according to following two formula
The contour line of top-surface camber section：
In formula：Represent the light to shine from LEDLight intensity magnitude, d Ω represent lightIt is enclosed jointly with central ray
Into solid angle infinitesimal；E (p) represents lightThe luminous energy that the P points of reached blackboard surface are received, ds are P points and institute of target's center
The area element surrounded；
In formula：n0niThe respectively refractive index of incident medium and refractive medium；n0=1, ni=1.49；Respectively
Emergent ray vector, incident ray vector and method arrow；
3) half light intensity angles of LED are 120 degree, wherein 100 degree of light is penetrated via lens inner cavity top-surface camber, lens exit facet
Go out, and the both ends endpoint of inner cavity top-surface camber range line profile is determined with this, tapered protrusion is set respectively on the outside of two-end-point；Two tapers
The surface of the neighbouring inner cavity top-surface camber side of protrusion is the first lens inner cavity side and the second lens inner cavity side, far from bent on inner cavity
The surface of face side is the first reflecting surface and the second reflecting surface, the light that remaining 20 degree of half light intensity angles of LED, through the first lens inner cavity
Side and the second lens inner cavity side, when the first reflecting surface of directive, the second reflecting surface, are totally reflected, and are finally emitted via lens
It projects refraction and projects in face；
Light passes through above-mentioned processing, obtains the C90/C270 faces of final distribution curve flux.
Through the above technical solutions, the utility model realizes the light-out effect that polarisation optically focused is integrated, especially with good
The uniformity of good vertical illumination.
Description of the drawings
Attached drawing 1 is the axonometric drawing of the utility model.
Attached drawing 2 is a kind of structure diagram of the utility model.
Attached drawing 3 is that LED light distributions used in the utility model are lambert's body light distribution curve that half light intensity angle is 120 °.
Attached drawing 4 is the lateral cloth lamp schematic diagram of blackboard of middle and primary schools' standard classroom.
Attached drawing 5 is blackboard forward direction cloth lamp schematic diagram.
Attached drawing 6 is the sectional view of optical lens.
Attached drawing 7 is the axonometric drawing of optical lens.
Attached drawing 8 is light path schematic diagram
Attached drawing 9 is whole lamp light distribution curve.
Wherein：1st, lamp body outline border；2nd, right end cap；3rd, power supply；4th, PCB circuit board；5th, optical lens；6th, transparent PS plates；7、
Left end cap；8th, lens inner cavity top-surface camber；9th, the first lens inner cavity side；10th, the first reflecting surface；11st, the second lens inner cavity side；
12nd, the second reflecting surface；13rd, lens exit facet；14th, LED light-emitting surfaces；15th, blackboard；16th, blackboard lights main body.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment：The LED blackboard lights of a kind of high evenness of the utility model, as shown in Figure 1 and Figure 2, outside with lamp body
Frame 1, power supply 3, PCB circuit board 4 and optical lens 5 blackboard lights main body 16, blackboard lights main body 16 is set on 15 front upper place of blackboard；
LED light source is welded on pcb board, according to the demand of practical illumination, can flexibly select the number of LED light source.Optical lens 5 is pacified
In PCB circuit board 4.
Determine that LED distribution curve fluxs and optical lens 5 are used for the cross section contour of light processing part with the following method.
1) LED light distributions are lambert's body that half light intensity angle is 120 °, and distribution curve flux C0/C180 faces, which are denoted as, is parallel to blackboard surface,
Distribution curve flux C90/C270 faces are denoted as perpendicular to blackboard surface；
2) optical lens 5 includes lens inner cavity top-surface camber 8, lens exit facet 13, and lens exit facet 13 is with LED light-emitting surfaces
14 centers are the arc surface of origin；The minimum range of lens inner cavity top-surface camber 8 and LED light-emitting surfaces 14 is set, according to following two formula
Acquire the contour line of 8 section of lens inner cavity top-surface camber：
In formula：Represent the light to shine from LEDLight intensity magnitude, d Ω represent lightIt is enclosed jointly with central ray
Into solid angle infinitesimal；E (p) represents lightThe luminous energy that the P points of reached blackboard surface are received, ds are P points and institute of target's center
The area element surrounded；
In formula：n0niThe respectively refractive index of incident medium and refractive medium；n0=1, ni=1.49；Respectively
Emergent ray vector, incident ray vector and method arrow；
3) half light intensity angles of LED are 120 degree, wherein 100 degree of light is via lens inner cavity top-surface camber 8, lens exit facet 13
It projects, and the two-end-point of 8 range line profile of inner cavity top-surface camber is determined with this, tapered protrusion is set respectively on the outside of two-end-point；Two cones
Shape protrusion is the first lens inner cavity side 9 and the second lens inner cavity side 11 adjacent to the surface of 8 side of inner cavity top-surface camber, far from interior
The surface of 8 side of chamber top-surface camber is the first reflecting surface 10 and the second reflecting surface 12, and half light intensity angles of LED light 20 degree remaining passes through
First lens inner cavity side 9 and the second lens inner cavity side 11, when the first reflecting surface of directive 10, the second reflecting surface 12, are all-trans
It penetrates, finally reflects and project via lens exit facet 13；
Light passes through above-mentioned processing, obtains the C90/C270 faces of final distribution curve flux.
The light of distribution curve flux C90/270 faces largest light intensity answers the lower edge of directive blackboard 15, that is, meets 1 >=Arctan of θ (L/
(H-1))；The light of distribution curve flux C90/270 faces minimum intensity of light answers the upper limb of directive blackboard (15), that is, meets 2 >=Arctan of θ
(L/(H-1.4-1))；Distribution curve flux C0/C180 faces light intensity angle meets 3 >=2*Arctan of θ (0.7*L/3).
LED light source is located at optical lens lumen centers position.
The lamp body outline border 1 of 5 light emission side of optical lens sets transparent PS plates 6.Transparent PS plates, on the one hand play enclosed light source chamber,
Dust-proof effect.On the other hand, light of the light that optical lens 5 projects after transparent PS plates is than the light withouyt transparent PS plates
Line, hot spot seen by person are that a rectangle rather than a bright line, human eye feel softer.
For the clearer mechanism for illustrating the utility model, it is further illustrated as follows：The utility model principle is,
LED is equidistantly evenly distributed in PCB circuit board, and the LED light distributions that shine are lambert's body that half light intensity angle is 120 °, see Fig. 3.Due to
The face to be illuminated blackboard of blackboard lights is rectangle, and blackboard lights are mounted on the wide upper limb of blackboard, to realize that blackboard surface vertical illumination is equal
Evenness reaches 0.8, it is necessary to carry out secondary optical design to the LED of 120 ° of primary bodies of youth.Blackboard lights distribution curve flux C0/C180 faces are remembered
To be parallel to blackboard surface, distribution curve flux C90/C270 faces are denoted as perpendicular to blackboard surface.Fig. 4 is China's standard classroom layout drawing, is schemed
Middle L is horizontal distance of the blackboard lights away from blackboard surface, H is height of the blackboard lights apart from ground, blackboard width is 1.4m, blackboard length
Away from ground it is 1m for 4m, plate lower edge, a length of 1.2 meters of the blackboard lights of cloth 3.Cloth lamp figure is shown in Fig. 5, the geometric center of intermediate lamp with it is black
Slab geomitry center overlaps, and three lamp geometric center spacing are d.Light to enable blackboard light irradiation covers the wide direction of blackboard,
And meeting the blackboard surface vertical illumination uniformity, the light of blackboard lights distribution curve flux C90/270 faces largest light intensity answers directive blackboard
Lower edge meets 1 >=Arctan of θ (L/ (H-1)).The light of blackboard lights distribution curve flux C90/270 faces minimum intensity of light answers directive black
The upper limb of plate meets 2 >=Arctan of θ (L/ (H-1.4-1)).Light to enable blackboard light irradiation covers the side of blackboard length
To blackboard lights distribution curve flux C0/C180 faces light intensity angle need to meet 3 >=2*Arctan of θ (0.7*L/3).
Assuming that all light of blackboard lights are irradiated on blackboard surface, blackboard lights LED total light fluxs are Φ 1, are irradiated to blackboard
Luminous flux phi 2 on face, it is contemplated that the optical loss of lens material is about 0.9.It can obtain 0.9* Φ 1=Φ 2, then they it
Between should meet the described correspondence of following formula：
Represent certain light to shine from LEDLight intensity magnitude, d Ω represent lightIt is surrounded jointly with central ray
Solid angle infinitesimal；E (p) represents lightThe luminous energy that the P points of reached blackboard surface are received, ds are surrounded by p and target's center
Area element.
The light of LED transmittings meets snell law by optical lens 5, and formula (2) is snell law：
n0niThe respectively refractive index of incident medium and refractive medium, here n0=1, ni=1.49.It is respectively
Penetrate ray vectors, incident ray vector and method arrow.
In this example, LED center position is enabled to be located at the lumen centers position of optical lens 5, enables the height of optical lens 5
For h1, for lens inner cavity projection portion away from LED light-emitting surfaces 14 apart from for h, the length of 5 end face of optical lens is D, sees Fig. 5.H1 takes
0.01m, h take 0.005m, D that 0.02m, L is taken to take 0.6m, H that 3m, d is taken to take 1.3m,.Simultaneous formula (1) and formula (2) obtain free optics
The contour line of the lens inner cavity top-surface camber 8 of lens 5；Optical lens 5 has the first reflecting surface 10, the second reflecting surface 12, is complete
Reflecting surface, lens exit facet 13 are using the center of LED light-emitting surfaces 14 as origin, and radius is the arc surface of 0.015m.Radial drawing,
Length 1.19m is stretched as, the entity of optical lens 5 is obtained, sees Fig. 7.
With reference to the light path of Fig. 8, half light intensity angles of LED are 120 degree, wherein 100 degree of light via lens inner cavity top-surface camber 8,
Lens exit facet 13 projects, half light intensity angles of LED light 20 degree remaining, through the first lens inner cavity side 9 and the second lens inner cavity
Side 11, when the first reflecting surface of directive 10, the second reflecting surface 12, are totally reflected, and are finally penetrated via lens exit facet 13
Go out.Light passes through above-mentioned processing, obtains the C90/C270 faces that final distribution curve flux is Fig. 9.
The final distribution curve flux C0/C90 faces of Fig. 9 are similar with distribution curve flux Fig. 3 of LED itself, are because optical lens 5 is by scheming
Section shown in 6 stretches, this some light is without progress secondary optical design.
The IES files of Fig. 9 distribution curve fluxs are imported into Dialux files, condition setting is consistent with Fig. 4, Fig. 5, obtains blackboard surface
The vertical illumination uniformity is 0.83.It is surveyed with blackboard lights, the blackboard surface vertical illumination uniformity is 0.82.
The utility model LED blackboard lights principal length is 12000mm, and can change its length and installation according to actual conditions
Quantity, cover blackboard lower edges regional extent 1000mm-1400mm, blackboard left and right edges regional extent be more than 1000mm.
Claims (5)
1. a kind of LED blackboard lights of high evenness, including with lamp body outline border (1), power supply (3), PCB circuit board (4) and optics
The blackboard lights main body (16) of lens (5), blackboard lights main body (16) are welded on PCB circuits set on blackboard (15) front upper place, LED light source
On plate (4), optical lens (5) is in PCB circuit board (4)；It is characterized in that：1) it is 120 ° that LED light distributions, which are half light intensity angle,
Lambert's body, distribution curve flux C0/C180 faces, which are denoted as, is parallel to blackboard surface, and distribution curve flux C90/C270 faces are denoted as perpendicular to blackboard
Face；2) optical lens (5) includes lens inner cavity top-surface camber (8), lens exit facet (13), and lens exit facet (13) is sends out with LED
Smooth surface (14) center is the arc surface of origin；Set the minimum range of lens inner cavity top-surface camber (8) and LED light-emitting surfaces (14), root
The contour line of lens inner cavity top-surface camber (8) section is acquired according to following two formula：
In formula：IRepresent the light to shine from LEDLight intensity magnitude, d Ω represent lightIt is surrounded jointly with central ray
Solid angle infinitesimal；E (p) represents lightThe luminous energy that the P points of reached blackboard surface are received, ds are P points and institute of target's center
The area element surrounded；
In formula：n0niThe respectively refractive index of incident medium and refractive medium；n0=1, ni=1.49；Respectively emergent light
Line vector, incident ray vector and method arrow；3) half light intensity angles of LED are 120 degree, wherein 100 degree of light is via on lens inner cavity
Curved surface (8), lens exit facet (13) project, and the both ends endpoint of inner cavity top-surface camber (8) range line profile, two-end-point are determined with this
Outside sets tapered protrusion respectively；Two tapered protrusions are the first lens inner cavity side adjacent to the surface of inner cavity top-surface camber (8) side
(9) and the second lens inner cavity side (11), the surface far from inner cavity top-surface camber (8) side are that the first reflecting surface (10) and second are anti-
Penetrate face (12), half light intensity angles of LED light 20 degree remaining, through the first lens inner cavity side 9 and the second lens inner cavity side (11),
It is totally reflected when the first reflecting surface of directive (10), the second reflecting surface (12), finally reflects and project via lens exit facet (13)；
Light passes through above-mentioned processing, obtains the C90/C270 faces of final distribution curve flux.
2. a kind of LED blackboard lights of high evenness according to claim 1, it is characterised in that：Distribution curve flux C90/270 faces
The light of largest light intensity answers the lower edge of directive blackboard (15), that is, meets θ1≥Arctan(L/(H-1))；Distribution curve flux C90/270
The light of face minimum intensity of light answers the upper limb of directive blackboard (15), that is, meets θ2≥Arctan(L/(H-1.4-1))；Distribution curve flux
C0/C180 faces light intensity angle meets θ3≥2*Arctan(0.7*L/3)；
θ in formula1For by the face according to blackboard lower edge and blackboard lights illuminating source geometric center point composition with being shone light by blackboard lights
The angle on the vertical plane two sides of source geometric center point vertical level, unit are °；θ2To be sent out according to blackboard top edge and blackboard lights
The face of radiant geometric center point composition and the vertical plane two by blackboard lights illuminating source geometric center point and vertical level
The angle in face, unit are °；θ3For blackboard lights C0/C180 faces distribution curve flux light intensity angle, unit is °；H is blackboard lights illuminating source
Height of the geometric center point apart from the plane where the dais of classroom, unit m；L for blackboard lights illuminating source geometric center point away from
With a distance from the vertical plane of installation blackboard place, unit m.
3. a kind of LED blackboard lights of high evenness according to claim 1, it is characterised in that：The LED light source is located at light
Learn lens lumen centers position.
4. a kind of LED blackboard lights of high evenness according to claim 1, it is characterised in that：First reflecting surface
(10) and the second reflecting surface (12) is frosting, and material is the PMMA of high transparency.
5. a kind of LED blackboard lights of high evenness according to claims 1 or 2 or 3 or 4, it is characterised in that：The optics
The lamp body outline border (1) of lens (5) light emission side sets transparent PS plates (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720862419.7U CN207569627U (en) | 2017-07-17 | 2017-07-17 | A kind of LED blackboard lights of high evenness |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720862419.7U CN207569627U (en) | 2017-07-17 | 2017-07-17 | A kind of LED blackboard lights of high evenness |
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| CN207569627U true CN207569627U (en) | 2018-07-03 |
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| CN201720862419.7U Expired - Fee Related CN207569627U (en) | 2017-07-17 | 2017-07-17 | A kind of LED blackboard lights of high evenness |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107366853A (en) * | 2017-07-17 | 2017-11-21 | 浙江凯耀照明股份有限公司 | A kind of LED blackboard lightses of high evenness |
| CN110962741A (en) * | 2019-12-26 | 2020-04-07 | 珠海市唯能车灯实业有限公司 | Automobile indoor illuminating lamp capable of uniformly emitting light |
-
2017
- 2017-07-17 CN CN201720862419.7U patent/CN207569627U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107366853A (en) * | 2017-07-17 | 2017-11-21 | 浙江凯耀照明股份有限公司 | A kind of LED blackboard lightses of high evenness |
| CN107366853B (en) * | 2017-07-17 | 2019-10-15 | 浙江凯耀照明股份有限公司 | A kind of LED blackboard lights of high evenness |
| CN110962741A (en) * | 2019-12-26 | 2020-04-07 | 珠海市唯能车灯实业有限公司 | Automobile indoor illuminating lamp capable of uniformly emitting light |
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Granted publication date: 20180703 |