CN204404073U - A kind of high order aspect type direct-light type LED backlight illumination light-distribution lens - Google Patents
A kind of high order aspect type direct-light type LED backlight illumination light-distribution lens Download PDFInfo
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- CN204404073U CN204404073U CN201520107871.3U CN201520107871U CN204404073U CN 204404073 U CN204404073 U CN 204404073U CN 201520107871 U CN201520107871 U CN 201520107871U CN 204404073 U CN204404073 U CN 204404073U
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Abstract
The utility model relates to backlight technology field, specifically refers to a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens.Luminous intensity distribution comprises lens body, and described lens body comprises the plane of incidence and exit facet; The face type of the wherein said plane of incidence and exit facet is all high order aspect type, has this distribution having the lens of high-order term chain of command type effectively can control the distribution, particularly high angle scattered light of forward refracted ray, can meet the needs of back lighting preferably.Under the utility model lens can be implemented in same lighting area prerequisite that is interior and same illuminance uniformity on diffuser plate, increase the distance between LED light source, reduce LED quantity, and the distance shortened between LED light source and diffuser plate, the cost of direct-light type LED backlight illuminator is declined, volume-diminished.
Description
Technical field
The utility model relates to backlighting technology field, specifically refers to a kind of high order aspect profile shape direct-light type LED backlight illumination light-distribution lens.
Background technology
The back lighting mode of the LED-backlit illumination of current liquid crystal display television and LED panel lamp etc. has two kinds usually with light structures: a kind of side (LED light axle is substantially vertical with light guide plate side) for plurality of LEDs being placed on light guide plate, the light that LED sends enters into light guide plate through light guide plate side, there is multiple total reflection and refraction in light guide plate after, finally all light transmits through the front of light guide plate, by accurately controlling light guide plate reflection and the ratio of refraction, uniform exiting surface can be formed in light guide plate front; This mode is often referred to as side entering type lighting system.Another plurality of LEDs light source is placed on the diffuser plate back side (in this method, LED light axle is substantially vertical with the diffuser plate back side), in order to the irradiation of uniform light sent by LED is at the diffuser plate back side, need between each LED and diffuser plate, place a secondary light-distribution lens, after the light that LED sends by light-distribution lens carries out secondary distribution, be radiated at the back side of diffuser plate uniformly; Such light enters into diffuser plate inside through the diffuser plate back side and spreads again, goes out to shoot out from the front of diffuser plate, and can form uniform exiting surface in diffuser plate front, this mode is often referred to as straight-down negative lighting system.
Above-mentioned two kinds of lighting systems are compared, and form same lighting area, and the light travel path of side entering type is much larger than straight-down negative, and the light extraction efficiency of side entering type is low, so adopt, its energy consumption of lighting system of side entering type is high, cost is high.
In recent years along with further application and the popularization of the LED-backlit illumination of display (such as flat panel television display) and the product of LED panel lamp etc.The power conservation requirement of corresponding product and the demand of cost control are also come urgently; Traditional side entering type lighting system that under such background, efficiency is lower is progressively being replaced by straight-down negative lighting system.
The development trend of current LED downward back optical illumination is: under the prerequisite as far as possible increasing the spacing (mainly in order to reduce LED quantity in same area) between LED, reduce the thickness (mainly in order to reduce system bulk) from LED light source to diffuser plate, also will ensure the uniformity of irradiating simultaneously.This has higher requirement to light-distribution lens.
In prior art, in order to increase the spacing between LED, compress the distance between LED and diffuser plate simultaneously, as shown in Figure 1, some straight-down negative systems adopt reflective lens to carry out secondary distribution to the light that LED sends, light 120 scioptics 130 allowing the LED110 of considerable part send reflex on the reflector layer 140 on system inner chamber, and then to reflex on diffuser plate 150.Although this lighting system can reduce spatial altitude, the characteristic of reflector layer is relied on comparatively large, require higher to the surface precision of lens and the smooth depth of installation accuracy and reflector layer etc. simultaneously, therefore more difficultly realize Uniform Illumination.
The straight-down negative system also had now adopts refraction type lens to carry out secondary distribution to the light that LED sends, but be difficult to spacing distance between LED large and the spacing of LED and diffuser plate is little realize Uniform Illumination.One of major reason causing illumination unevenness is that the face shape of lens entrance face and exit facet is fairly simple, the plane of incidence of some lens and exit facet adopt many spheres to be spliced, the simple conical surface of some employings, this light that LED light source is sent is difficult to effectively distribute in polarizers of big angle scope according to the demand of back lighting.
Utility model content
In order to realize above-mentioned effect, the utility model provides a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens; By adjusting the face type of exit facet and the plane of incidence, reasonable distribution is carried out to light, the usage quantity that can reduce the LED light source of backlight illuminating system under the prerequisite reaching same illuminance uniformity can also realize the thickness reduced from LED light source to diffuser plate simultaneously, reduces the volume of system.
In order to realize above-mentioned technique effect, the utility model takes following technical scheme:
In order to overcome the above problems, the utility model proposes a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens; Comprise lens body, wherein said lens body comprises exit facet, the plane of incidence and bottom composite surface; Described bottom composite surface is positioned at the bottom of described lens body, is connected with the described plane of incidence near the side of lens body central shaft; The described plane of incidence is positioned at the bottom centre of described lens body, caves in lens body top-direction.
The exit facet of lens body described in the utility model and the face type of the plane of incidence are high-order curved surface.Wherein, the plane of incidence and exit facet face type all can by equations
describe, wherein c is curved surface vertex curvature, and k is secondary aspherical coefficient, and r is radial coordinate (r
2=x
2+ y
2), z is axial coordinate, α
ifor i term coefficient, i is 1,2,3 ... natural number.
Further, the Xiang Cizhong of type expression formula i>=6, exit facet face of lens described in the utility model has a term coefficient α at least
inon-vanishing.
Further, the Xiang Cizhong of type expression formula i>=4, plane of incidence face of lens described in the utility model has a term coefficient α at least
inon-vanishing.
There is this distribution having the lens of high-order term chain of command type effectively can control the distribution, particularly high angle scattered light of forward refracted ray, the needs of back lighting can be met preferably.
Further, described bottom composite surface comprise at least one sub-composite surface, when described sub-composite surface along cross lens body central axis direction cut open time, on the hatching of sub-composite surface, the central shaft of the normal of any point in section and described lens body intersects at the below of lens body.
In the utility model, the bottom composite surface of lens body comprises sub-composite surface, sub-composite surface is ring-type, overall in the angle raised to the top-direction of lens body, the Fresnel boundary reflection light reflected by described exit facet reflects away to the direction of departing from lens body central shaft, effectively reduce the accumulation of the center low-angle light caused by Fresnel boundary reflection light like this, add the intensity of the light field departing from lens centre, improve the uniformity of back lighting.
Further, described bottom composite surface comprises at least two sub-composite surfaces, is connected between described sub-composite surface by non-working surface; The sub-composite surface of described bottom composite surface and non-working surface form zigzag endless belt (described bottom composite surface crosses the section of described lens body central shaft, cut formation open hatching be zigzag; Each sawtooth comprises the hatching of described non-working surface and adjacent sub-composite surface; As a whole, bottom composite surface forms zonary structure).
Preferred as one, the angle of described non-working surface and lens base is between 75 ° to 90 °; The saw-tooth ring formed in above-mentioned angular range farthest can ensure the effective area of sub-composite surface, also facilitates the demoulding in lens body production process simultaneously.
Preferred as one, the sawtooth root of the saw-tooth profile line of described bottom composite surface is located on the same line, and this sawtooth root is simple at the project organization of same straight line, and convenient processing and the manufacturing, reduce production cost.
Preferred as one, the sawtooth root on the composite surface saw-tooth profile line of described bottom is positioned on curve, can increase the flexibility of optics and Machine Design like this, more effectively control Fresnel reflected rays.
A kind of direct-light type LED backlight illuminator based on said lens is provided, comprises the LED light source that is arranged on pcb board and be arranged on above LED light source to realize this direct-type backlight LED lens of secondary light-distribution.
Further, described system also comprises diffuser plate, and described diffuser plate is arranged on the front of described lens.The light that LED light source on pcb board can further send by the application of described diffuser plate better evenly be diffused into exiting surface.Under such system can be implemented in same lighting area prerequisite that is interior and same illuminance uniformity on diffuser plate, increase the distance between LED light source, reduce LED quantity, and the distance shortened between LED light source and diffuser plate, the cost of direct-light type LED backlight illuminator is declined, volume-diminished.
Further, the utility model also comprises a kind of TV, comprises above-mentioned backlight illuminating system.
Further, provide a kind of panel light, comprise above-mentioned high order aspect type direct-light type LED backlight illumination light-distribution lens.
The utility model has following beneficial effect: the utility model provides a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens; By adjusting the face type of exit facet and the plane of incidence, reasonable distribution is carried out to light, the use amount that can reduce the lens on LED-backlit panel under the prerequisite realizing same illuminance uniformity can also realize the thickness reduced from LED light source to diffuser plate simultaneously, reduces the volume of system.
Secondly the bottom surface of the utility model lens body comprises bottom composite surface, described bottom composite surface comprise at least one sub-composite surface, on the hatching that described sub-composite surface is cut open along lens body central axis direction, the normal of any point and the central shaft of described lens body intersect at the below of lens body.Sub-composite surface bottom lens is ring-type, the Fresnel boundary reflection light reflected through described exit facet is reflected away to the direction of departing from lens body central shaft, effectively reduces the accumulation of the center low-angle light caused by Fresnel boundary reflection light.
Accompanying drawing explanation
Fig. 1 is reflective backlight lens combination schematic diagram in prior art.
Fig. 2 is high order aspect type direct-light type LED backlight illumination light-distribution lens stereoscopic and partly cuts open structure chart.
Fig. 3 is the bottom composite surface section close-up schematic view of high order aspect type direct-light type LED backlight illumination light-distribution lens.
Fig. 4 is the generalized section of the bottom composite surface of high order aspect type direct-light type LED backlight illumination light-distribution lens.
Fig. 5 is the perspective view of embodiment 1.
Fig. 6 is the generalized section of embodiment 1.
Fig. 7 is the upward view of embodiment 1.
Fig. 8 is the perspective view of embodiment 2.
Fig. 9 is the generalized section of embodiment 2.
Figure 10 is the upward view of embodiment 2.
Detailed description of the invention
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
In order to realize above-mentioned effect, the utility model provides a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens, there is this distribution having the lens of high-order term chain of command type effectively can control forward refracted ray, the particularly distribution of high angle scattered light, can meet the needs of back lighting preferably.Composite surface is set bottom lens simultaneously, effectively can controls the distribution of Fresnel reflected rays in illumination light field, reduce the accumulation of emergent ray in center light field.
In order to realize above-mentioned technique effect, the utility model takes following technical scheme:
In order to overcome the above problems, the utility model proposes a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens; Shown in Fig. 2, comprise lens body 300, wherein said lens body 300 comprises exit facet 302, the plane of incidence 301 and bottom composite surface 303; Described exit facet 302, the plane of incidence 301 and bottom composite surface 303 are all coaxial with lens body 300;
Wherein said exit facet 302 is positioned at the outer surface of described lens body 300, and the bottom of described exit facet 300 is connected with the bottom composite surface 303 of described lens body 300 (also can be connected with bottom composite surface 303 through side 304);
Described bottom composite surface is positioned at the bottom of described lens body 303, is connected with the described plane of incidence 301 near the side of lens body 300 central shaft;
The described plane of incidence 301 is positioned at the bottom centre of described lens body 300, caves in lens body 300 top-direction.
The exit facet 302 of described lens body and the face type of the plane of incidence 301 are high-order curved surface.Wherein, the plane of incidence and exit facet face type all can by equations
describe, wherein c is curved surface vertex curvature, and k is secondary aspherical coefficient, and r is radial coordinate (r
2=x
2+ y
2), z is axial coordinate, α
ifor i term coefficient, i is 1,2,3 ... natural number.
Further, the Xiang Cizhong of type expression formula i>=6, exit facet face of lens described in the utility model has a term coefficient α at least
inon-vanishing.
Further, the Xiang Cizhong of type expression formula i>=4, plane of incidence face of lens described in the utility model has a term coefficient α at least
inon-vanishing.
There is this distribution having the lens of high-order term chain of command type effectively can control the distribution, particularly high angle scattered light of forward refracted ray, the needs of back lighting can be met preferably.
Further, described bottom composite surface 303 comprise at least one sub-composite surface 303-1 (as Fig. 2, Fig. 3 and Fig. 4), when described sub-compound 303-1 face is along when lens body central axis direction is cut open excessively, on the hatching of sub-composite surface 303-1, the normal FF ' of any point in section and the central shaft 00 ' of described lens body intersect at the below of lens body.(as shown in Figure 4).
Further, described bottom composite surface comprises at least two sub-composite surface 303-1, is connected between described sub-compound 303-1 face by non-working surface 303-2; Described bottom composite surface 303 through the section of described lens body central shaft, cut formation open hatching be zigzag (as shown in Figure 2, Figure 3 and Figure 4); As a whole, bottom composite surface forms zonary structure.
The light field of the reverberation of lens base is further split by the design of this jagged endless belt composite surface, the reflection light field of every sub-composite surface forms a sub-reflection light field, reflect away passing through from the more uniform direction to departing from lens body central shaft of Fresnel boundary reflection light that exit facet reflects, further increase the even photosensitiveness of the high angle scattered light of lens, what further improve lens goes out optical property.
This patent provides a kind of backlight illuminating system further, and comprise the LED light source that is arranged on pcb board and be arranged on to realize this direct-type backlight LED lens of secondary light-distribution above LED light source, described lens are said lens.Such system can be implemented in same lighting area and under the prerequisite of same illuminance uniformity, increase the distance between LED light source, reduce LED quantity, and shorten the distance between LED light source and diffuser plate, the cost of direct-light type LED backlight illuminator is declined, volume-diminished.
Further, described system also comprises diffuser plate, and described diffuser plate is arranged on the front of described lens.The light that LED light source on pcb board can further send by the application of described diffuser plate is better, evenly be diffused into exiting surface.
Further, described system also comprises reflecting layer, and described reflecting layer is positioned at the front of described pcb board and described pcb board fits tightly; Although refraction type secondary light-distribution lens is very low to the degree of dependence in reflecting layer in use the utility model, the use in reflecting layer can improve the optical energy utilization efficiency of backlight illuminating system better, reaches energy-saving effect well.
The utility model also comprises a kind of TV, comprise backlight illuminating system, described backlight illuminating system comprises the LED light source that is arranged on pcb board and is arranged on to realize this direct-type backlight LED lens of secondary light-distribution above LED light source, and described lens are smooth direct-light type LED backlight illumination light-distribution lens even described in this patent.
The utility model also comprises a kind of panel light, comprises backlight illuminating system, described backlight illuminating system comprise realize secondary light-distribution this patent described in even smooth direct-light type LED backlight illumination light-distribution lens.
The utility model is not limited to aforesaid detailed description of the invention.The utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Embodiment 1
The exit facet of the backlight lens in the present embodiment and the plane of incidence are as the high order aspect type in detailed description of the invention, better effectively can control the distribution of the distribution, particularly high angle scattered light of forward refracted ray, can meet the needs of back lighting preferably; This outer bottom composite surface comprises a sub-composite surface, on described sub-composite surface section, the normal of any point and the central shaft of described lens body intersect at the below of described lens body, and as shown in Fig. 5, Fig. 6 and Fig. 7, (wherein Fig. 5 is the perspective view of the present embodiment; Fig. 6 is the generalized section of the present embodiment; Fig. 7 is the upward view of the present embodiment).All the other structures of the present embodiment and operation principle identical with above-mentioned detailed description of the invention, do not repeat them here.
Embodiment 2
The exit facet of the backlight lens in the present embodiment and the plane of incidence are as the high order aspect type in detailed description of the invention, better effectively can control the distribution of the distribution, particularly high angle scattered light of forward refracted ray, can meet the needs of back lighting preferably; The bottom composite surface of this outer lens comprises 6 sub-composite surfaces, and the hatching of described bottom composite surface is zigzag, and the sawtooth root of the hatching of described bottom composite surface is located along the same line, and the central shaft of this straight line and lens body described in the present embodiment is to vertical; And the hatching of described sub-composite surface is linear structure, moreover described sub-composite surface is the closer to the denser arrangement mode in lens body edge, and as shown in Fig. 8, Fig. 9, Figure 10, (wherein Fig. 8 is the perspective view of the present embodiment; Fig. 9 is the generalized section of the present embodiment; Figure 10 is the upward view of the present embodiment), all the other structures of the present embodiment and operation principle identical with above-mentioned detailed description of the invention, do not repeat them here.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a high order aspect type direct-light type LED backlight illumination light-distribution lens, comprise lens body, wherein said lens body comprises exit facet, the plane of incidence; It is characterized in that, the face type of the described plane of incidence and exit facet all can by equation
describe; Wherein c is curved surface vertex curvature, and k is secondary aspherical coefficient, and r is radial coordinate (r
2=x
2+ y
2), z is axial coordinate, α
ibe i-th term coefficient, i is 1,2,3 ... natural number; The Xiang Cizhong of type expression formula i>=6, described exit facet face has a term coefficient α at least
inon-vanishing.
2. a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens as claimed in claim 1, it is characterized in that, the Xiang Cizhong of type expression formula i>=4, described plane of incidence face has a term coefficient α at least
inon-vanishing.
3. a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens as claimed in claim 1, is characterized in that, described lens body also comprises bottom composite surface, and described bottom composite surface is coaxial with described lens body; Described bottom composite surface comprise at least one sub-composite surface, when described sub-composite surface along cross lens body central axis direction cut open time, on the hatching of sub-composite surface, the central shaft of the normal of any point in section and described lens body intersects at the below of lens body.
4. a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens as claimed in claim 3, it is characterized in that, described bottom composite surface comprises at least two sub-composite surfaces, is connected between described sub-composite surface by non-working surface.
5. a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens as claimed in claim 4, it is characterized in that, the angle of described non-working surface and lens base is between 75 ° to 90 °.
6. a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens as claimed in claim 4, it is characterized in that, the sawtooth root of the saw-tooth profile line of described bottom composite surface is located on the same line, or is positioned on curve.
7. a kind of high order aspect type direct-light type LED backlight illumination light-distribution lens as claimed in claim 3, it is characterized in that, lens have a sub-composite surface, described sub-composite surface be arranged on illumination bottom lens body from peak value to the region of 10% peak value in; Described sub-composite surface hatching is straight line or is curve.
8. a backlight illuminating system, comprise the LED light source that is arranged on pcb board and be arranged on to realize the direct-type backlight LED lens of secondary light-distribution above LED light source, it is characterized in that, described lens are one of claim 1 to 7 lens.
9. a TV, comprise backlight illuminating system, described backlight illuminating system comprises the LED light source that is arranged on pcb board and to be arranged on above LED light source to realize the direct-type backlight LED lens of secondary light-distribution, it is characterized in that, described lens are the described lens of one of claim 1 to 7.
10. a panel light, comprises backlight illuminating system, and described backlight illuminating system comprises the direct-type backlight LED lens realizing secondary light-distribution, it is characterized in that, described lens are the lens described in one of claim 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520107871.3U CN204404073U (en) | 2015-02-14 | 2015-02-14 | A kind of high order aspect type direct-light type LED backlight illumination light-distribution lens |
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|---|---|---|---|
| CN201520107871.3U CN204404073U (en) | 2015-02-14 | 2015-02-14 | A kind of high order aspect type direct-light type LED backlight illumination light-distribution lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106895326A (en) * | 2017-04-26 | 2017-06-27 | 欧普照明股份有限公司 | A kind of lens and the lighting device using the lens |
| CN112578483A (en) * | 2019-09-30 | 2021-03-30 | 瑞识科技（深圳）有限公司 | VCSEL beam expanding lens and VCSEL device |
-
2015
- 2015-02-14 CN CN201520107871.3U patent/CN204404073U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106895326A (en) * | 2017-04-26 | 2017-06-27 | 欧普照明股份有限公司 | A kind of lens and the lighting device using the lens |
| CN106895326B (en) * | 2017-04-26 | 2023-06-30 | 欧普照明股份有限公司 | Lens and lighting device using same |
| CN112578483A (en) * | 2019-09-30 | 2021-03-30 | 瑞识科技（深圳）有限公司 | VCSEL beam expanding lens and VCSEL device |
| CN112578483B (en) * | 2019-09-30 | 2022-08-05 | 瑞识科技（深圳）有限公司 | VCSEL beam expanding lens and VCSEL device |
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