CN105068161A - Optical element and lighting device - Google Patents
Optical element and lighting device Download PDFInfo
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- CN105068161A CN105068161A CN201510371712.9A CN201510371712A CN105068161A CN 105068161 A CN105068161 A CN 105068161A CN 201510371712 A CN201510371712 A CN 201510371712A CN 105068161 A CN105068161 A CN 105068161A
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Abstract
The present invention provides an optical element. The optical element comprises a substrate which is provided with upper and lower surfaces and a pair of opposed side walls, the upper and lower surfaces are also opposed to each other, the upper surface of the substrate is a light exiting face and is provided with a plurality of raised first micro structure units, a bottom end of each first micro structure unit is arranged on the upper surface while a top end opposed to the bottom end is provided with a groove structure, the lower surface of the substrate is a light entering face of the optical element and is provided with a plurality of second micro structure units, and the second micro structure units sink from the lower surface towards the inside of the substrate. According to the optical element with the double-face micro structures, through coordination of the micro structure units of the upper and lower surfaces of the optical element, propagation directions of light rays are changed, bat wing light distribution is thus realized, and illumination of a working plane becomes uniform.
Description
Technical field
The present invention relates to a kind of optical element, especially a kind of optical element and lighting device with microstructure.
Background technology
When the brightness that the brightness ratio human eye of certain light source or object in visual field has adapted to is much bigger, people just has the sensation of dazzling the eyes, and this phenomenon is referred to as dazzle.Clear stipulaties is had to dazzle, homogeneity: in workroom or operation area, uniformity of illuminance should be not less than 0.7 in standard GB/T 50034-2004; Library, reading room, office space, medical clinic etc. site requirements type unified glare value UGR<19.
Market there is a lot of method controlling dazzle, as anti-dazzle circle conventional in Down lamp, Ceiling light, grid sheet in grid lamp disc etc., but wide-angle panel light fixture is difficult to control its luminous intensity distribution shape and glare index, the mode of what the low dazzle panel light of existing market upper part adopted is increase by one piece of prism plate controls dazzle, because the requirement of prism plate overall weight, thickness to consider etc. factor to the impact of optical efficiency, the restriction of production cost and cosmetic look, the gross thickness of prism plate is generally at 2-3mm, and the height tend of microstructure is less.Fig. 1 and Fig. 2 illustrates prism plate common on several market, and the prism plate of circular arc microstructure does not change distribution curve flux shape substantially; The prism plate of zigzag microstructure is also only narrowed within the specific limits by lambert's luminous intensity distribution, is difficult to realize batswing tab distribution curve flux to reach low dazzle, the uniform illuminating effect of illumination of working plane.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of uniform-illumination, the optical element with microstructure unit of low dazzle and adopt the lighting device of this optical element.
For achieving the above object, the present invention adopts following technical scheme.
A kind of optical element, comprise substrate, described substrate has relative upper and lower surface and pair of sidewalls, the upper surface of described substrate is exiting surface, described upper surface is provided with the first microstructure unit of multiple projection, the bottom of described first microstructure unit is arranged on the upper surface, the top relative with bottom has groove structure, the lower surface of described substrate is the incidence surface of described optical element, described lower light face is provided with multiple second microstructure unit, described multiple second microstructure unit from lower surface to substrate sunken inside.
Preferably, corresponding described first microstructure unit on described substrate height direction of the second microstructure unit described in each.
Preferably, described first microstructure unit is identical along the width of substrate transverse axis with described second micro unit.
Preferably, described first microstructure unit comprises the zone line of depression and is positioned at the fringe region of projection of described zone line, and zone line and fringe region seamlessly transit.
Preferably, in the cross section of described first microstructure unit, described zone line is formed as recessed para-curve or V-type or circular arc, and described fringe region forms convex para-curve or circular arc.
Preferably, in the cross section of the first microstructure unit, the arc radius that fringe region is formed is more than or equal to 0.3mm.
Preferably, described upper surface of base plate is less than 1/2nd of described substrate thickness to the height on the summit of described fringe region.
Preferably, in the cross section of described second microstructure unit, described depressed part is fractal is recessed para-curve or circular arc or reverse V-shaped.Aforesaid substrate is made up of acrylic or PC material.
Preferably, when the angle of incident ray and vertical direction is between 0 degree to 30 degree, incident ray is by after the first microstructure unit of described optical element and the second microstructure unit, and the angle of emergent ray and vertical direction is near 20 degree to 30 degree.
Preferably, when the angle of incident ray and vertical direction is between 60 degree to 90 degree, incident ray is by after the first microstructure unit of described optical element and described second microstructure unit, and the angle of emergent ray and vertical direction is near 40 degree to 60 degree.
The present invention also provides a kind of lighting device, it is characterized in that, comprises light source, above-described optical element, and the light that described light source sends is through described optical element uniform.Lighting device also comprises diffuser plate, and described optical element is adjacent with described diffuser plate.
Preferably, the lower surface laminating of described optical element is arranged on described diffuser plate.
Preferably, described diffuser plate comprises at least two exiting surfaces at an angle to each other, and described optical element is provided with at an angle to each other at least two regions corresponding with the exiting surface of described diffuser plate.
Beneficial effect: the present invention devises a kind of optical element with double-side micro structure, batswing tab luminous intensity distribution is realized by the microstructure unit of the upper and lower surface of the optical element direction of propagation jointly changing light that cooperatively interacts, can more effective reduction UGR value, achieve low dazzle, illumination of working plane evenly.
In lighting device, this optical element and diffuser plate are combined, be placed on above light source, microstructure unit is utilized to change light transmition direction to the reflection of light, refraction action, realize batswing tab luminous intensity distribution, and reach that illumination zone is wide, illumination of working plane is even, low dazzle UGR value, the illuminating effect of more than 110 ° wide-angle bright dippings can be reached.
According to below with reference to the accompanying drawing description of this invention, other targets of the present invention and effectiveness will become apparent, and reader can fully understand the present invention.
Accompanying drawing explanation
Fig. 1 is the microstructure schematic diagram of prior art prism plate one
Fig. 2 is the microstructure schematic diagram of prior art prism plate two;
Fig. 3 is the schematic diagram of an embodiment of optical element of the present invention;
Fig. 4 is the schematic diagram of the sectional view of the optical element meeting the embodiment of the present invention;
Fig. 5 is the direction of propagation schematic diagram of middle low-angle incident ray in optical element of the present invention;
Fig. 6 is the direction of propagation schematic diagram of large angle incidence light in optical element of the present invention;
Fig. 7 is the distribution curve flux of optical element of the present invention;
Fig. 8 is the structural drawing of an embodiment of lighting device of the present invention;
Fig. 9 is the structural drawing of another embodiment of lighting device of the present invention.
Embodiment
Aforementioned and other technology contents, feature and effect for the present invention, in the detailed description of the embodiment of following cooperation reference diagram, can clearly present.
Below in conjunction with Fig. 3 to Fig. 7, optical element of the present invention is described.
A kind of optical element 10, comprise substrate 16, substrate 16 has relative upper and lower surperficial 14,15 and pair of sidewalls 17,18.The upper surface 14 of substrate is the exiting surface of optical element, on upper surface, interval arranges multiple first microstructure unit 12, first microstructure unit 12 is protruding from upper surface 14, the bottom 122 of the first microstructure unit arranges on an upper, and the top 121 of the projection of first microstructure unit relative with bottom has groove structure.It is the exiting surface of optical element that lower surface 15 interval of aforesaid substrate 16 arranges multiple second microstructure unit 13, second microstructure unit 13, the second microstructure unit from lower surface 15 to substrate 16 sunken inside.Therefore, first, second microstructure unit 12,13 on substrate 16 after arrangement is in short transverse, and namely in Fig. 3, Z-direction corresponds to each other, i.e. each second microstructure unit 13 corresponding first microstructure unit 12 in the short transverse of substrate.And along the length direction of substrate 16, i.e. Y direction, extending longitudinally.And each first, second microstructure unit 12,13 is along substrate 16 X direction, namely the distance of X-direction extension is suitable each other.First microstructure unit 12 can integrated molding with substrate 16.
Fig. 4 is the schematic diagram of the sectional view of optical element of the present invention, and cross section is the cross section perpendicular to Y-axis in XYZ coordinate system in Fig. 3.With reference to Fig. 4, the first microstructure unit 12 comprises the zone line 1211 of depression and is positioned at the fringe region 1212,1213 of the adjacent projection in zone line both sides, seamlessly transits between zone line and fringe region.In the embodiment of Fig. 4, the shape of zone line 1211 is V-type curves, and in addition, the shape of zone line also can be recessed para-curve or circular arc.In Fig. 4, the cross section 1212,1213 of fringe region is circular arc, also can be convex para-curve.If the curve formed behind fringe region cross section is circular arc, then the radius of circular arc is more than or equal to 0.3mm.In order to meet the mould molding precision adding man-hour, the spacing on transitional region two summits that adjacent two the first microstructure units are contiguous, the distance namely between adjacent two the first microstructure units is more preferably greater than 2mm.
In Fig. 4, the first microstructure unit 12 is bilateral symmetry, symmetrical in the center line by described groove structure.Conveniently processing and accurate chain of command type error, the height H 1 of the first microstructure unit 12 controls within 1/3 of the overall wall thickness H of optical element 1, namely the upper surface 14 of substrate 16 arrives the summit of described fringe region 1212,1213, namely the height of circular arc summit R or para-curve summit R is less than 1/2nd of the thickness of described substrate 16, thus the height avoiding optical element 1 is too high makes material deformation, impact is known clearly the precision of optical element.
In addition, the width along substrate transverse axis X-axis of the first microstructure unit, the i.e. distance W1 on two summits of the first microstructure unit, equal with the width along substrate transverse axis X-axis of the second microstructure unit, namely equal with the distance W2 between the second microstructure unit and connect two nodes of base lower surface.
In addition, the overall wall thickness H of optical element 1 controls within 3mm, to reduce the overall weight of optical element 1 and to facilitate optical element 1 installation fixing.In order to obtain better optical effect, the transparent PMMA material of optical element 1 prioritizing selection is made, and takes second place and also can select transparent PC material.
Fig. 5 and Fig. 6 is the direction of propagation schematic diagram of incident ray in optical element 1 of the present invention, wherein the angle of incident ray refers to incident ray and vertical direction, namely with the angle of Z-direction, the such as light in 0 ° of-10 ° of direction refers to that the angle of the angle of incident ray and vertical direction is 0 °-10 °, namely as in Fig. 5 planimetric coordinates XZ, the angle of incident ray and longitudinal axis Z.
First microstructure unit 12 of optical element 1 can control the light in 0 °-10 ° and 55 °-70 ° of directions, by its deviation near 20 °-30 °, decreases central light strength, and adds the light intensity of 20 ° of-30 ° of left and right directions; First microstructure unit 12 also can the light in control angle 10 °-55 ° and angle 70 ° of-90 ° of directions, by its deviation to 40 ° of-60 ° of directions, thus angle light ratio near decreasing 10 ° and beyond 60 °.
The distribution curve flux of light after the first microstructure unit 12 of the upper surface 14 of optical element 1 is that the light intensity in 20 ° of-30 ° of directions is less in angle compared with standard batswing tab luminous intensity distribution, be that the light intensity in 40 ° of-60 ° of directions is stronger in angle, such distribution curve flux shape is larger improvement more existing than common distribution curve flux in homogeneity and dazzle UGR, in order to obtain better effect, optical element 1 is provided with multiple second microstructure unit 13 at lower surface 15.
With reference to Fig. 5, the incident ray of part A and vertical direction angle are between 10 °-30 °, namely angle incident ray in, after the second microstructure unit 13 of the lower surface 15 of optical element 1 near deviation to low-angle 0 °-7 °, reflect rear outgoing by the first microstructure unit 12 of upper surface 14 again, last emergent ray direction and the angle of vertical direction are greatly between 20 °-30 °.
In Fig. 5, the incident ray of part B and vertical direction angle are between 0 °-10 °, be called low-angle incident ray, after the second microstructure unit 13 of optical element lower surface, there is a small deviation, refracted ray is in vertical direction with about 7 ° of about-12 ° angles, rear outgoing is reflected again by the first microstructure unit 12 of the upper surface 14 of optical element 1, last emergent ray direction and the angle of vertical direction are near 20 °-30 °, deviation is no more than positive and negative 5 degree, for example, 10 degree of deviations are to 30 °, and the meeting deviation of 12 degree is to 33 degree.
In Fig. 6, the two-part incident ray of C, D respectively and vertical direction angle between 60 °-90 °, retrodeviating through the second microstructure unit 13 of lower surface 15 folds near 15 °-50 °, outgoing after the refraction, total reflection of the first microstructure unit 12 of upper surface 14 again, the angle of last emergent ray direction and vertical direction about 40 °-60 °.
Fig. 7 is the distribution curve flux of optical element of the present invention.Because angle 10 °-30 ° direction light can focus within the scope of low-angle 0 °-10 ° by the second microstructure unit 13, the first microstructure unit 12 surface is incided through substrate inside, according to the effect of the first microstructure unit 12, the angle meeting deviation of this some light is to 20 ° of-30 ° of directions, so just the light ray energy in a part 40 ° of-60 ° of directions is deflected into 20 ° of-30 ° of directions, such distribution curve flux has more excellent effect in homogeneity and dazzle UGR.
Fig. 8 is the embodiment that the present invention adopts the lighting device of optical element 1.With reference to Fig. 8, lighting device comprises light source board 40, LED and is arranged on light source board 40, and light source board 40 is positioned in chassis 50, fits in light source board 40 lower surface and chassis 50.Lighting device also comprises diffuser plate 30 and above-mentioned optical element 10, and optical element 10 is arranged at above described diffuser plate 30, and incident ray enters optical element by diffuser plate 30, by the outgoing of described optical element 10.In the present embodiment, the lower surface laminating of optical element 10 is arranged on described diffuser plate 30.Optical element 10 and diffuser plate 30 assembling are fixed on frame 20, and frame 20 is fixed together by screw or other modes with the sidewall on chassis 50.
When there is no above-mentioned optical element 10, when luminous flux is 3000lm, UGR=22, after adding the optical element 10 with double-side micro structure unit 12,13, achieve batswing tab luminous intensity distribution, control beam angle can control between 110 °-120 °, UGR<19(luminous flux 3000lm).Thus provide that a kind of illumination zone is wide, illumination of working plane is even, low dazzle, wide-angle lighting device.
Fig. 9 is another embodiment that the present invention adopts the lighting device of optical element 10.
In Fig. 9, the embodiment of lighting device compared with Fig. 8 is compared, change the shape of diffuser plate 30 and above-mentioned optical element 10, diffuser plate 30 is set to forming by least two exiting surfaces at an angle to each other, and optical element 10 is provided with at an angle to each other at least two regions corresponding with the exiting surface of described diffuser plate 30.In the present embodiment, the exiting surface of diffuser plate 30 divides three regions, is mutually certain angle (about 10 °), and in addition, diffuser plate 30 also can be comprise two exiting surfaces at an angle to each other, or the exiting surface that more than three at an angle to each other.Optical element 10 is also provided with at an angle to each other at least two regions corresponding with the exiting surface of diffuser plate 30.LED is arranged on light source board 40, and light source board 40 is positioned in chassis 50, fits in light source board 40 lower surface and chassis 50.Optical element 10 and diffuser plate 30 are placed in chassis 50, and are placed on above light source board 40, and optical element is fixed on frame 20, and frame 20 is fixed together by screw or other modes with the sidewall on chassis 50.
Adopt the lighting device after above-mentioned optical element 10, beam angle can be realized between 110 °-120 °, UGR<19(luminous flux 3000lm) and batswing tab luminous intensity distribution, thus provide that a kind of illumination zone is wide, illumination of working plane is even, low dazzle UGR value, the lighting device of more than 110 ° wide-angle bright dippings can be reached.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (16)
1. an optical element (10), comprise substrate (16), described substrate has relative upper, lower surface (14, 15) and pair of sidewalls (17, 18), it is characterized in that, the upper surface (14) of described substrate (16) is exiting surface, described upper surface is provided with first microstructure unit (12) of multiple projection, the bottom (122) of described first microstructure unit is arranged on the upper surface, the top (121) relative with bottom (122) has groove structure, the incidence surface that the lower surface (15) of described substrate (16) is described optical element, described lower light face is provided with multiple second microstructure unit (13), described multiple second microstructure unit (13) from lower surface to described substrate (16) sunken inside.
2. optical element according to claim 1, is characterized in that, the second microstructure unit (13) described in each is corresponding described first microstructure unit (12) on described substrate height direction.
3. optical element according to claim 2, is characterized in that, described first microstructure unit is identical along the width of substrate transverse axis with described second micro unit.
4. optical element according to claim 2, it is characterized in that, described first microstructure unit (12) comprises the zone line (1211) of depression and is positioned at the fringe region (1212,1213) of projection of described zone line, and zone line and fringe region seamlessly transit.
5. optical element according to claim 4, it is characterized in that, in the cross section of described first microstructure unit (12), described zone line (121) is formed as recessed para-curve or V-type or circular arc, and described fringe region (122,123) forms convex para-curve or circular arc.
6. optical element according to claim 5, is characterized in that, in the cross section of described first microstructure unit (12), the arc radius that fringe region is formed is more than or equal to 0.3mm.
7. optical element according to claim 5, is characterized in that, described substrate (16) upper surface is less than 1/2nd of described substrate thickness to the height on the summit of described fringe region.
8. optical element according to claim 1, is characterized in that, in the cross section of described second microstructure unit, described depressed part is fractal is recessed para-curve or circular arc or reverse V-shaped.
9. optical element according to claim 1, is characterized in that, described substrate is made up of acrylic or PC material.
10. optical element according to claim 1, is characterized in that, described substrate and described first microstructure unit integrated molding.
11. optical elements according to claim 1, it is characterized in that, when the angle of incident ray and vertical direction is between 0 degree to 30 degree, incident ray is by after described first microstructure unit and the second microstructure unit, and the angle of emergent ray and vertical direction is near 20 degree to 30 degree.
12. optical elements according to claim 1, it is characterized in that, when the angle of incident ray and vertical direction is between 60 degree to 90 degree, incident ray is by after described first microstructure unit and described second microstructure unit, and the angle of emergent ray and vertical direction is near 40 degree to 60 degree.
13. 1 kinds of lighting devices, is characterized in that, comprise light source, according to the arbitrary described optical element of claim 1 to 12, the light that described light source sends is through described optical element uniform.
14. lighting devices according to claim 13, is characterized in that, also comprise diffuser plate, and described optical element is adjacent with described diffuser plate.
15. lighting devices according to claim 14, is characterized in that, the lower surface laminating of described optical element is arranged on described diffuser plate.
16. lighting devices according to claim 15, is characterized in that, described diffuser plate comprises at least two exiting surfaces at an angle to each other, and described optical element is provided with at an angle to each other at least two regions corresponding with the exiting surface of described diffuser plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510371712.9A CN105068161A (en) | 2015-06-30 | 2015-06-30 | Optical element and lighting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510371712.9A CN105068161A (en) | 2015-06-30 | 2015-06-30 | Optical element and lighting device |
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| CN105068161A true CN105068161A (en) | 2015-11-18 |
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| CN201510371712.9A Pending CN105068161A (en) | 2015-06-30 | 2015-06-30 | Optical element and lighting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117739301A (en) * | 2024-02-21 | 2024-03-22 | 浙江锦德光电材料有限公司 | Collimation assembly for limiting light angle and light source device |
| CN117739301B (en) * | 2024-02-21 | 2024-04-26 | 浙江锦德光电材料有限公司 | Collimation assembly for limiting light angle and light source device |
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