CN104806976A - Novel uniform light direct type LED (light-emitting diode) back lighting light distribution lens - Google Patents
Novel uniform light direct type LED (light-emitting diode) back lighting light distribution lens Download PDFInfo
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- CN104806976A CN104806976A CN201510080477.XA CN201510080477A CN104806976A CN 104806976 A CN104806976 A CN 104806976A CN 201510080477 A CN201510080477 A CN 201510080477A CN 104806976 A CN104806976 A CN 104806976A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
Abstract
The invention relates to the technical field of backlight, in particular to a novel uniform light direct type LED (light-emitting diode) back lighting light distribution lens which comprises a lens body. The lens body comprises an incident surface, an emergent surface and a bottom composite surface, the normal of an arbitrary point on a section line of a composite subsurface in a section and the central axis of the lens body are intersected below the lens body when the composite subsurface is split along the central axis of the lens body, fresnel interface reflection light reflected by the emergent surface is reflected in a direction far away from the central axis of the lens body, accumulation of the light in a central area above the lens is effectively reduced, and light uniformity of an emergent light field is enhanced. In the same light-emitting area and on the premise of the same illumination uniformity on a diffusion plate, the distance between LED light sources can be increased, the number of LEDs is decreased, the distance between each LED light source and the diffusion plate is shortened, so that the cost and the size of a direct type LED back lighting system are reduced.
Description
Technical field
The present invention relates to backlighting technology field, specifically refer to a kind of novel even smooth direct-light type LED backlight illumination light-distribution lens.
Background technology
The back lighting mode of the LED-backlit illumination of present 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.
As shown in Figure 2, one of reason causing illumination unevenness is that lens 220 plane of incidence 221 is fairly simple with the face shape of exit facet 223, 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.
Another major reason is light when propagating in different medium, and light is by always also existing Fresnel boundary reflection during interface, and the larger Fresnel boundary reflection effect of incident angle is more obvious.When usually propagating from optically thinner medium to optically denser medium, after incidence angle is greater than 60 °, the increase along with incidence angle is risen by its Fresnel boundary reflection rate; From optically denser medium to optically thinner medium, during transmission, Fresnel boundary reflection is then more remarkable, and after incidence angle is greater than 30 °, the increase along with incidence angle is sharply risen by its Fresnel boundary reflection rate.
The light sent from LED light source enters lens body after the refraction of the plane of incidence, when reaching exit facet, some light reflects away through exit facet, and in addition some light by boundary reflection to lens interior, this part reflection ray is after the multiple reflections and refraction of lens base or system inner chamber reflecting surface etc. multiple, above LED, gathering of light (energy) can be formed by mid portion region, have a strong impact on the uniformity of lens outgoing light field.
With reference in figure 2, sent the light 231 entering lens 220 by the LED light source 210 be positioned at below the plane of incidence and can be separated when arriving exit facet 223, become refracted ray 232 and Fresnel reflected rays 233.Usual refracted ray 232 can carry most of energy and directly be mapped to diffuser plate 250, Fresnel reflected rays 233 then can be carried small part energy and is reflected back lens interior, then through bottom lens body 222 or lens body bottom under reflections off objects after form secondary reflection light 234, reflect lens when secondary reflection light 234 encounters exit facet 223 again and become light 235, light 235 is advanced after stretch journey and is arrived diffuser plate 250.Can find out that light 235 can by mid portion region gather above LED210 by light course.Because light 231 is enter optically thinner medium by optically denser medium when arriving exit facet 223, therefore Fresnel boundary reflection effect is comparatively obvious, there is higher reflectivity, therefore the phenomenon leaning on mid portion zonal ray (energy) to gather above the LED210 caused due to Fresnel boundary reflection is comparatively remarkable, finally has influence on the uniformity of back lighting.
Summary of the invention
In order to overcome the problem that in prior art, near backlight lens centre, low-angle light is piled up, the invention provides a kind of novel even smooth direct-light type LED backlight illumination light-distribution lens, the accumulation of the emergent ray caused by Fresnel boundary reflection in center light field can be reduced, reasonable layout emergent ray, the usage quantity that can reduce the LED light source on LED-backlit panel under the prerequisite realizing same illuminating effect 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 present invention takes following technical scheme: a kind of novel even smooth direct-light type LED backlight illumination light-distribution lens, and 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 bottom 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;
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; The Fresnel boundary reflection light that described exit facet reflects by described sub-composite surface reflects away towards the direction of departing from described lens body central shaft.
During use, LED exiting surface flushes with the bottom of the described plane of incidence or higher than the bottom of the described plane of incidence.During use, the light that LED light source sends, all enters described lens body after the refraction action of the plane of incidence.
Further, described bottom composite surface can be provided with a transition face near the side of lens body central shaft, and is connected with bottom the described plane of incidence by described transition face.
Further, the height of hatching bottom the distance lens body of one end of sub-composite surface of described transition face is greater than the height of bottom bottom lens body of the plane of incidence.Such transition face is relative to lens body, present a whole shape to lower recess, and by drop-down for the bottom surface of the plane of incidence, better can collect the light that LED light source sends, because the height of LED chip is general very low in present stage, the design that the bottom surface of the plane of incidence is drop-down, better can ensure that the light that LED sends all enters lens body by the plane of incidence, avoids light energy losses; Moreover, the design that the hatching of transition face is greater than the height of bottom bottom lens body of the plane of incidence near one end of sub-composite surface apart from the height bottom lens body has also reserved enough spaces for arranging of sub-composite surface.
In the present invention, 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 through described exit facet is reflected 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-90 ° of even photosensitiveness to 90 ° of outgoing light fields on the whole.
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; The hatching length of described sub-composite surface is greater than the hatching length of the non-working surface be adjacent.Described bottom composite surface, along crossing 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; This broached-tooth design, space can be saved, can in less bottom space, the offering question of the sub-composite surface of good solution, reduce the thickness of lens, the volume of compression lens, well achieves the technique effect reflected away towards the direction of departing from lens body central shaft by Fresnel boundary reflection light.
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.
Further, the sawtooth root in the composite surface jagged line of described bottom is positioned on same straight line, the central axis of this straight line and lens body; I.e. composite surface bottom described lens body, sub-composite surface root be positioned at same plane bottom lens body, such structural design structure is simple, convenient processing and manufacturing, and reduces production cost.
Preferred as one, the sawtooth root on the composite surface saw-tooth profile line of described bottom is located along the same line, and the central shaft of this straight line and described lens body tilts, and intersects at above the bottom of described lens body with the central shaft of described lens body; Like this, being equivalent to all serrated faces to be positioned in a large inclined plane, better can realizing the effect reflected away to the direction of departing from lens body central shaft by the Fresnel boundary reflection light through reflecting from exit facet.
Preferred as one, the sawtooth root on the composite surface saw-tooth profile line of described bottom is positioned at one on the curve of lens body top depression; On described curve, the normal of every bit and the central shaft of described lens body intersect at the below of described lens body; There is the angle of inclination of a gradual change like this between each sawtooth, better can ensure the even photosensitiveness reflecting away light through sawtooth, be also conducive to the intensity improving high angle scattered light simultaneously.
Preferred as one, described sub-composite surface hatching is straight line; Sub-composite surface is like this equivalent to a taper seat, and structure is simple, is convenient to make.
Preferred as one, described sub-composite surface hatching is curve, and the design of curve can according to the position of the zone of reflections, the angle of the sub-composite surface of flexible modulation and described lens body bottom surface, to reach optimum light-out effect.
Further, described sub-composite surface is identical with the angle of inclination of described lens body bottom surface; Identical angle of inclination, facilitates processing and fabricating, lowers production cost.
Preferred as one, the angle of inclination of described sub-composite surface and described lens body bottom surface, increases successively near the direction of lens body axis.The design that this angle of inclination increases successively, can better reflect away the light near lens body center with the direction of more departing from lens body central shaft, is conducive to the light reduced further near lens axis and piles up.Better even light effect can be realized.
Further, the hatching length of described each sub-composite surface is equal, and the bottom composite surface of described lens body is evenly distributed; This equally distributed sub-composite surface design, structure is simple, is convenient to processing and makes, and is conducive to lowering production cost.
Preferred as one, the hatching length of described sub-composite surface increases successively along the direction to lens body central shaft.More sparse near the distribution of crossing lens body center, and the position distribution at close lens body edge is more intensive; This outer close inner thin reflection endless belt design can reduce non-working surface outside lens to the interference of the sub-composite surface institute reflection ray of adjacent close lens inboard.
Further, further improved by the face type of sub-composite surface, described sub-composite surface comprises at least 2 recombiner units.Secondary recombiner unit on sub-composite surface is flakey distribution, the composite surface of this flake type, further splits the light field of reflected light, and the little light field after segmentation reconfigures, under the prerequisite not reducing beam projecting efficiency, further improve the even photosensitiveness of outgoing light field.
Preferred as one, described recombiner unit is plane, and the project organization of plane is simple, and convenient processing and the manufacturing, reduce production cost.
Preferred as one, described recombiner unit is the design of curved surface, curved surface, when light reflects to the direction away from lens body central shaft through mutually discrete described sub-composite surface, there is further peptizaiton to reflected light, be conducive to the even photosensitiveness improving emergent ray.
Preferred as one, described time recombiner unit is uniformly distributed on described sub-composite surface around the central shaft of described lens body, and such is uniformly distributed design, and lens arrangement symmetrically, reduces manufacturing cost.
Preferred as one, described recombiner unit also can be around the central shaft non-uniform Distribution of described lens body on the sub-composite surface of correspondence.
Preferred as one, the alignment arrangement between the secondary recombiner unit on adjacent sub-composite surface similarly is split formation successively along crossing the just sub-composite surface of lens body center one rule cut-off rule.Such proper alignment, convenient processing and production.
Preferred as one, arrangement of staggering between the secondary recombiner unit on adjacent sub-composite surface, the compound light field of segmentation formation is more even like this.
Preferred as one, in order to improve the even photosensitiveness of outgoing light field further, sub-composite surface is set to hair side; Or sub-composite surface is carried out atomization process, the direction of the light main body reflected through sub-composite surface so does not change, or towards reflecting away from the direction of described lens body central shaft as far as possible, but the even photosensitiveness of reflection ray is further improved.Be conducive to improving that sub-composite surface causes the regular secondary reflection of exit facet in diffuser plate glazed thread phenomenon pockety.
Preferred as one, sub-composite surface being arranged to depth-to-width ratio is 0.3, and speciality is of a size of the hair side of 0.05; The sub-composite surface of such parameter, realizes reasonable, even light effect.
Further, just non-working surface is set to hair side; Or non-working surface is carried out atomization process, the benefit of being carried out by non-working surface being atomized process or being set to hair side is, can avoid because part reverberation is irradiated to unfavorable reflection caused by non-working surface as far as possible, the design of hair side, this part light can be become diffuse reflection, weaken the luminous intensity of the main direction of this part light.
In order to significantly improve secondary light-distribution lens central shaft near the accumulation problem of low-angle light, in the present invention, the face type of the described plane of incidence and exit facet has carried out further improvement.
The exit facet of lens body described in the present invention 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 of the present invention 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 of the present invention 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, in order to ensure that described lens and LED light source are installed accurately and light-distribution lens easy to assembly, the bottom surface of lens or side are provided with positioner.
Further, in order to realize the accurate positioning of the installation of lens and LED light source panel and improve installation effectiveness, simplify installation process, at the correspondence position of LED panel corresponding to lens or pcb board, be provided with the corresponding positioner that described lens positioning device matches.
Preferred as one, described positioner is locating dowel.
Preferred as one, described positioner is locating hole.
Preferred as one, described positioner is locating fastener.
Be locating groove as the preferred described positioner of one.
Preferred as one, described locating dowel, locating hole, locating fastener or locating groove distribute at described lens bottom even.
Preferred as one, the number of described locating dowel, locating hole, locating fastener or locating groove be greater than 1 integer, such as 2,3,4,5.
Further, described positioner, is arranged on the marginal position bottom described lens, can be the bottom margin being set directly at lens body, also can be the position arranging positioner in the bottom outside of described lens body specially.
Further, the positioner of described lens body and described lens body one-body molded.
Preferred as one, the positioner of described lens body and described lens body pass through injection moulding or hot pressing mode one-body molded.
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 is 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, state reflecting layer and be 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 present invention, the use in reflecting layer can improve the optical energy utilization efficiency of backlight illuminating system better, reaches energy-saving effect well.
The invention provides a kind of TV, comprise said lens, or comprise above-mentioned backlight illuminating system.
The invention provides a kind of panel light, comprise said lens.
The present invention has following beneficial effect:
1, the invention provides a kind of novel even smooth direct-light type LED backlight illumination light-distribution lens, the accumulation of the emergent ray caused by Fresnel boundary reflection in center light field can be reduced, more reasonably distribute light, the usage quantity that can reduce the LED light source on LED-backlit panel under the prerequisite realizing same illuminating effect can also realize the thickness reduced from LED light source to diffuser plate simultaneously, reduces the volume of system.
The described bottom composite surface of lens of the present invention 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.Sub-composite surface bottom lens is ring-type, overall raised in the top-direction to lens body, the Fresnel boundary reflection light reflected through described exit facet is reflected 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, add the luminous intensity of the light field departing from lens centre, make the issue of emergent ray more reasonable.
2, bottom the present invention, composite surface can be provided with a transition face near the side of lens body central shaft, and is connected with bottom the described plane of incidence by described transition face.And the height of hatching bottom the distance lens body of one end of sub-composite surface stating transition face is greater than the height of bottom bottom lens body of the plane of incidence.Avoid light energy losses; Enough spaces have been reserved for arranging of sub-composite surface simultaneously.
3, when the present invention comprises at least 2 sub-composite surfaces, be connected by non-working surface between the sub-composite surface of the present invention, and form zigzag endless belt, zigzag endless belt of the present invention can save space, in less bottom space, the offering question of sub-composite surface can be solved, reduce the thickness of lens, the volume of compression lens, reaches the technique effect reflected away towards the direction of departing from lens body central shaft by Fresnel boundary reflection light.
4, further sub-for the present invention composite surface is split, the flake type composite surface formed, mutually discrete between each recombiner unit, the light field of reflected light is further split, little light field after segmentation reconfigures, under the prerequisite not reducing beam projecting efficiency, further improve the even photosensitiveness of outgoing light field.
5, the exit facet of lens body described in the present invention and the face type of the plane of incidence are high power curved surface, better realize the reasonable distribution to light.
6, the bottom surface of lens and side are provided with positioner, ensure that described lens and LED light source are installed accurately and light-distribution lens easy to assembly.
Lens of the present invention more reasonably can distribute light in a word, improve in prior art, and the low-angle light near the central shaft caused by Fresnel boundary reflection piles up problem, and improves the uniformity through lens outgoing light field.The usage quantity that can reduce the LED light source on LED-backlit panel under the prerequisite realizing same illuminating effect can also realize the thickness reduced from LED light source to diffuser plate simultaneously, reduces the volume of system.
Accompanying drawing explanation
Fig. 1 is reflective backlight lens combination schematic diagram in prior art.
Fig. 2 is the system schematic of refraction type backlight lens in prior art.
Fig. 3 is this novel even smooth direct-light type LED backlight illumination light-distribution lens stereoscopic and partly cuts open structure chart.
Fig. 4 is the bottom composite surface section close-up schematic view of this novel even smooth direct-light type LED backlight illumination light-distribution lens.
Fig. 5 is the generalized section of the bottom composite surface of this novel even smooth direct-light type LED backlight illumination light-distribution lens.
Fig. 6 is the perspective view of embodiment 1.
Fig. 7 is the generalized section of embodiment 1.
Fig. 8 is the upward view of embodiment 1.
Fig. 9 is the perspective view of embodiment 2.
Figure 10 is the generalized section of embodiment 2.
Figure 11 is the upward view of embodiment 2.
Figure 12 is the three-dimensional structure diagram of embodiment 3.
Figure 13 is the generalized section of embodiment 3.
Figure 14 is the perspective view of embodiment 4.
Figure 15 is the generalized section of embodiment 4.
Figure 16 is the upward view of embodiment 4.
Figure 17 is the three-dimensional structure diagram of embodiment 5.
Figure 18 is the generalized section of embodiment 5.
Figure 19 is the upward view of embodiment 5.
Figure 20 is the schematic perspective view of embodiment 6.
Detailed description of the invention
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
The invention provides a kind of novel even smooth direct-light type LED backlight illumination light-distribution lens, the accumulation of the emergent ray caused by Fresnel boundary reflection in center light field can be reduced, reasonable layout emergent ray, the usage quantity that can reduce the LED light source on LED-backlit panel under the prerequisite realizing same illuminating effect 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 present invention takes following technical scheme:
In order to overcome the above problems, the present invention proposes a kind of novel even smooth direct-light type LED backlight illumination light-distribution lens, and as shown in Figure 3, 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 upper 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.
Described exit facet 302, the plane of incidence 301 and bottom composite surface 303 are corresponding bus and rotate and the axisymmetric shape of formation around Lens body 300 central shaft.(close-up schematic view of described bottom composite surface 303 as shown in Figure 4)
Further, described bottom composite surface 303 comprise at least one sub-composite surface 303-1, described sub-composite surface 303-1 is along the section crossing lens body central shaft, and on the hatching cut open, the normal FF ' of any point on section and the central shaft OO ' of described lens body intersect at the below (as shown in Figure 5) of lens body; The Fresnel boundary reflection light that described exit facet reflects by described sub-composite surface reflects away towards the direction of departing from described lens body central shaft.
During use, LED exiting surface flushes with the bottom of the described plane of incidence or higher than the bottom of the described plane of incidence.During use, the light that LED light source sends, all enters described lens body after the refraction action of the plane of incidence.
Further, as shown in Figure 4, described bottom composite surface can be provided with a transition face 303-4 near the side of lens body central shaft, and is connected with bottom the described plane of incidence by described transition face 303-4.
Further, the height of hatching bottom the distance lens body of one end of sub-composite surface of described transition face is greater than the height of bottom bottom lens body of the plane of incidence.Such transition face is relative to lens body, present a whole shape to lower recess, and by drop-down for the bottom surface of the plane of incidence, better can collect the light that LED light source sends, because the height of LED chip is general very low in present stage, the design that the bottom surface of the plane of incidence is drop-down, better can ensure that the light that LED sends all enters lens body by the plane of incidence, avoids light energy losses; Moreover, the design that the hatching of transition face is greater than the height of bottom bottom lens body of the plane of incidence near one end of sub-composite surface apart from the height bottom lens body has also reserved enough spaces for arranging of sub-composite surface.
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 the hatching of formation open for zigzag (as shown in Fig. 3, Fig. 4 and Fig. 5); This broached-tooth design, space can be saved, can in less bottom space, the offering question of the sub-composite surface of good solution, reduce the thickness of lens, the volume of compression lens, well achieves the technique effect reflected away towards the direction of departing from lens body central shaft by Fresnel boundary reflection light.
Preferred as one, the angle (as shown in Fig. 4 label 303-3) of described non-working surface 303-2 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.
Further, the sawtooth root in the composite surface jagged line of described bottom is positioned on same straight line, the central axis of this straight line and lens body; I.e. composite surface bottom described lens body, sub-composite surface root be positioned at same plane bottom lens body, such structural design structure is simple, convenient processing and manufacturing, and reduces production cost.
Preferred as one, the sawtooth root on the composite surface saw-tooth profile line of described bottom is located along the same line, and the central shaft of this straight line and described lens body tilts, and intersects at above the bottom of described lens body with the central shaft of described lens body; Like this, being equivalent to all serrated faces to be positioned in a large inclined plane, better can realizing the effect reflected away to the direction of departing from lens body central shaft by the Fresnel boundary reflection light through reflecting from exit facet.
Preferred as one, the sawtooth root on the composite surface saw-tooth profile line of described bottom is positioned at one on the curve of lens body top depression; On described curve, the normal of every bit and the central shaft of described lens body intersect at the below of described lens body; There is the angle of inclination of a gradual change like this between each sawtooth, better can ensure the even photosensitiveness reflecting away light through sawtooth, be also conducive to the intensity improving high angle scattered light simultaneously.
Preferred as one, described sub-composite surface hatching is straight line; Sub-composite surface is like this equivalent to a taper seat, and structure is simple, is convenient to make.
Preferred as one, described sub-composite surface hatching is curve, and the design of curve can according to the position of the zone of reflections, the angle of the sub-composite surface of flexible modulation and described lens body bottom surface, to reach optimum light-out effect.
Further, described sub-composite surface is identical with the angle of inclination of described lens body bottom surface; Identical angle of inclination, facilitates processing and fabricating, lowers production cost.
Preferred as one, the angle of inclination of described sub-composite surface and described lens body bottom surface, increases successively near the direction of lens body axis.The design that this angle of inclination increases successively, can better reflect away the light near lens body center with the direction of more departing from lens body central shaft, is conducive to the light reduced further near lens axis and piles up.Better even light effect can be realized.
Further, the hatching length of described each sub-composite surface is equal, and the bottom composite surface of described lens body is evenly distributed; This equally distributed sub-composite surface design, structure is simple, is convenient to processing and makes, and is conducive to lowering production cost.
Preferred as one, the hatching length of described sub-composite surface increases successively along the direction to lens body central shaft.More sparse near the distribution of crossing lens body center, and the position distribution at close lens body edge is more intensive; This outer close inner thin reflection endless belt design can reduce non-working surface outside lens to the interference of the sub-composite surface institute reflection ray of adjacent close lens inboard.
Further, further improved by the face type of sub-composite surface, described sub-composite surface comprises at least 2 recombiner units.Secondary recombiner unit on sub-composite surface is flakey distribution, the composite surface of this flake type, further splits the light field of reflected light, and the little light field after segmentation reconfigures, under the prerequisite not reducing beam projecting efficiency, further improve the even photosensitiveness of outgoing light field.
Preferred as one, described recombiner unit is plane, and the project organization of plane is simple, and convenient processing and the manufacturing, reduce production cost.
Preferred as one, described recombiner unit is the design of curved surface, curved surface, when light reflects to the direction away from lens body central shaft through mutually discrete described sub-composite surface, there is further peptizaiton to reflected light, be conducive to the even photosensitiveness improving emergent ray.
Preferred as one, described time recombiner unit is uniformly distributed on described sub-composite surface around the central shaft of described lens body, and such is uniformly distributed design, and lens arrangement symmetrically, reduces manufacturing cost.
Preferred as one, described recombiner unit also can be around the central shaft non-uniform Distribution of described lens body on the sub-composite surface of correspondence.
Preferred as one, the alignment arrangement between the secondary recombiner unit on adjacent sub-composite surface similarly is split formation successively along crossing the just sub-composite surface of lens body center one rule cut-off rule.Such proper alignment, convenient processing and production.
Preferred as one, arrangement of staggering between the secondary recombiner unit on adjacent sub-composite surface, the compound light field of segmentation formation is more even like this.
Preferred as one, in order to improve the even photosensitiveness of outgoing light field further, sub-composite surface is set to hair side; Or sub-composite surface is carried out atomization process, the direction of the light main body reflected through sub-composite surface so does not change, or towards reflecting away from the direction of described lens body central shaft as far as possible, but the even photosensitiveness of reflection ray is further improved.Contribute to the halation phenomenon eliminating emergent light light field edge.Be conducive to improving sub-composite surface regular secondary reflection and cause in diffuser plate glazed thread phenomenon pockety.
Preferred as one, sub-composite surface being arranged to depth-to-width ratio is 0.3, and speciality is of a size of the hair side of 0.05; The sub-composite surface of such parameter, realizes reasonable, even light effect.
Further, just non-working surface is set to hair side; Or non-working surface is carried out atomization process, the benefit of being carried out by non-working surface being atomized process or being set to hair side is, can avoid because part reverberation is irradiated to unfavorable reflection caused by non-working surface as far as possible, the design of hair side, this part light can be become diffuse reflection, weaken the luminous intensity of the main direction of this part light.
In order to significantly improve secondary light-distribution lens central shaft near the accumulation problem of low-angle light, in the present invention, the face type of the described plane of incidence and exit facet has carried out further improvement.
The exit facet of lens body described in the present invention and the face type of the plane of incidence are high power 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 of the present invention 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 of the present invention 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, in order to ensure that described lens and LED light source are installed accurately and light-distribution lens easy to assembly, the bottom surface of lens or side are provided with positioner.
Further, in order to realize the accurate positioning of the installation of lens and LED light source panel and improve installation effectiveness, simplify installation process, at the correspondence position of LED panel corresponding to lens or pcb board, be provided with the corresponding positioner that described lens positioning device matches.
Preferred as one, described positioner is locating dowel.
Preferred as one, described positioner is locating hole.
Preferred as one, described positioner is locating fastener.
Be locating groove as the preferred described positioner of one.
Preferred as one, described locating dowel, locating hole, locating fastener or locating groove distribute at described lens bottom even.
Preferred as one, the number of described locating dowel, locating hole, locating fastener or locating groove be greater than 1 integer, such as 2,3,4,5.
Further, described positioner, is arranged on the marginal position bottom described lens, can be the bottom margin being set directly at lens body, also can be the position arranging positioner in the bottom outside of described lens body specially.
Further, the positioner of described lens body and described lens body one-body molded; Its molding mode is hot pressing or injection moulding.
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 is 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, 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; Use refraction type secondary light-distribution lens in the present invention very low to the degree of dependence in reflecting layer, high efficiency uniform illumination can be realized when not using reflecting layer, but the use in reflecting layer better improves the service efficiency of LED light source, although refraction type secondary light-distribution lens is very low to the degree of dependence in reflecting layer in use the present invention, but the use in reflecting layer can improve the optical energy utilization efficiency of backlight illuminating system better, reaches energy-saving effect well.
The invention provides a kind of TV, comprise said lens, or comprise above-mentioned backlight illuminating system.
The invention provides a kind of panel light, comprise said lens.
The present invention is not limited to aforesaid detailed description of the invention.The present invention 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 bottom composite surface of the backlight lens in the present embodiment comprises a sub-composite surface, on described sub-composite surface section, the upper normal of any point and the central shaft of described lens body intersect at the below of described lens body, lens arrangement in the present embodiment is simple, easily produces in enormous quantities; As shown in Fig. 6, Fig. 7 and Fig. 8, (wherein Fig. 6 is the perspective view of the present embodiment; Fig. 7 is the generalized section of the present embodiment; Fig. 8 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 bottom composite surface that backlight lens in the present embodiment comprise comprises 6 sub-composite surfaces, the hatching of described bottom composite surface is zigzag, 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. 9, Figure 10, Figure 11, (wherein Fig. 9 is the perspective view of the present embodiment; Figure 10 is the generalized section of the present embodiment; Figure 11 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 3
The bottom composite surface that backlight lens in the present embodiment comprise comprises 6 sub-composite surfaces, the hatching of described bottom composite surface is zigzag, the sawtooth root of the hatching of described bottom composite surface is positioned on curve, and on this curve, any point is larger the closer to the distance of its distance lens base of lens body central shaft; 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, (wherein Figure 12 is the schematic perspective view of the present embodiment as shown in Figure 12 and Figure 13, Figure 13 is the generalized section 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 4
The bottom composite surface that backlight lens in the present embodiment comprise comprises 6 sub-composite surfaces, the hatching of described bottom composite surface is zigzag, the sawtooth root of the hatching of described bottom composite surface is positioned on curve, and on this curve, any point is larger the closer to the distance of its distance lens base of lens body central shaft; The hatching of described sub-composite surface is linear structure, and described sub-composite surface is the closer to the denser arrangement mode in lens body edge, every sub-composite surface moreover in the present embodiment comprises 60 recombiner units, and mutually aligns between secondary recombiner unit on every straton composite surface.As shown in Figure 14, Figure 15 and Figure 16, (wherein, Figure 14 is the schematic perspective view of the present embodiment, Figure 15 is the generalized section of the present embodiment, Figure 16 is the elevational schematic 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 5
The bottom composite surface that backlight lens in the present embodiment comprise comprises 6 sub-composite surfaces, the hatching of described bottom composite surface is zigzag, the sawtooth root of the hatching of described bottom composite surface is positioned on curve, and on this curve, any point is larger the closer to the distance of its distance lens base of lens body central shaft; The hatching of described sub-composite surface is linear structure, and described sub-composite surface is the closer to the denser arrangement mode in lens body edge, every sub-composite surface moreover in the present embodiment comprises 60 recombiner units, and mutually staggers between secondary recombiner unit on every straton composite surface.As shown in Figure 17, Figure 18 and Figure 19, (wherein Figure 17 is the perspective view of the present embodiment. Figure 18 is the cross-sectional view of the present embodiment, Figure 19 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 6
As shown in figure 20, the bottom of the backlight lens in the present embodiment has locating dowel D, and the number of wherein said locating dowel D is 3, is evenly distributed in the bottom margin of lens, be arranged on special locating dowel installation site in the present embodiment, one-body molded with lens body in 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 invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (25)
1. a novel even smooth 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; It is characterized in that:
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: the part Fresnel boundary reflection light that described exit facet reflects by described sub-composite surface reflects away towards the direction away from described lens body central shaft.
2. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 1, it is characterized in that, described bottom composite surface is provided with a transition face near the side of lens body central shaft, and sub-composite surface as claimed in claim 1 is connected with bottom the described plane of incidence by described transition face.
3. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 2, it is characterized in that, the height of hatching bottom the distance lens body of one end of sub-composite surface of described transition face is greater than the height of bottom bottom lens body of the plane of incidence.
4. even smooth 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.
5. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 1, 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; The sub-composite surface of described bottom composite surface and non-working surface form zigzag endless belt.
6. even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 5, is characterized in that, the sawtooth root of the saw-tooth profile line of described bottom composite surface can be located on the same line or on a curve.
7. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 5, it is characterized in that, the straight line inclined that is perpendicular with the central shaft of described lens body or described lens body at the sawtooth root place of described saw-tooth profile line is crossing.
8. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 5, it is characterized in that, the angle of described non-working surface and lens base is between 75 ° to 90 °.
9. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 5, it is characterized in that, the hatching length of described sub-composite surface is greater than the hatching length of the non-working surface be adjacent.
10. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 5, it is characterized in that, the hatching of described sub-composite surface is straight line or curve.
11. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 5, it is characterized in that, described sub-composite surface is identical with the angle of inclination of described lens body bottom surface.
12. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 5, is characterized in that, the inclination angle of described sub-composite surface and described lens body bottom surface increases gradually along the direction near lens centre axle.
13. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 5, it is characterized in that, the hatching length of described each sub-composite surface is equal.
14. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 5, is characterized in that, the hatching length of described sub-composite surface increases successively along the direction to lens body central shaft.
15. novel even smooth direct-light type LED backlight illumination light-distribution lens as described in one of claim 1 to 14, is characterized in that, described sub-composite surface comprises at least 2 recombiner units.
16. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 15, it is characterized in that, described recombiner unit can be plane, also can be curved surface.
17. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 15, is characterized in that, the arrangement of can aliging between the secondary recombiner unit on adjacent sub-composite surface, arrangement of also can staggering.
18. novel even smooth direct-light type LED backlight illumination light-distribution lens as described in claim 2,3,4,5 or 15, is characterized in that, are set to by sub-composite surface be atomized hair side.
19. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 1, 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
ifor i 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; The Xiang Cizhong of type expression formula i>=4, described plane of incidence face has a term coefficient α at least
inon-vanishing.
20. as described in claim 2,3,4,5 or 15 novel even smooth direct-light type LED backlight illumination light-distribution lens, it is characterized in that, bottom surface or the side of described lens are provided with positioner.
21. novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 20, it is characterized in that, described positioner is locating dowel, locating hole, locating fastener or locating groove.
22. locate the parts of novel even smooth direct-light type LED backlight illumination light-distribution lens as claimed in claim 20 with installation in direct-light type LED backlight illuminator, it is characterized in that, in the place corresponding with lens positioning device, be provided with the positioner matched with described lens.
23. 1 kinds of Novel straight down type LED-backlit illuminators, is characterized in that, comprise the novel even smooth direct-light type LED backlight illumination light-distribution lens as described in one of claim 1 to 21.
24. 1 kinds of TVs, 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 it is characterized in that, described lens are the lens of one of claim 1 to 21.
25. 1 kinds of panel lights, is characterized in that, comprise the lens that one of claim 1 to 21 is described.
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|---|---|---|---|
| CN201510080477.XA CN104806976B (en) | 2015-02-14 | 2015-02-14 | Even smooth direct-light type LED backlight illumination light-distribution lens, system and a kind of TV |
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|---|---|---|---|
| CN201510080477.XA CN104806976B (en) | 2015-02-14 | 2015-02-14 | Even smooth direct-light type LED backlight illumination light-distribution lens, system and a kind of TV |
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| CN108105644A (en) * | 2017-12-19 | 2018-06-01 | 深圳市利科达光电有限公司 | A kind of lens arrangement for LED television backlight |
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| WO2019119710A1 (en) * | 2017-12-19 | 2019-06-27 | 深圳市利科达光电有限公司 | Lens structure for led television backlight source |
| CN112505967A (en) * | 2020-12-09 | 2021-03-16 | 宁波视睿迪光电有限公司 | Optical lens, light supplementing device and liquid crystal display module |
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