Summary of the invention
The object of the embodiment of the present invention is to provide a kind of lens, and being intended to solve LED, to send light long-pending less after existing lens outgoing, and uniform not problem.
The embodiment of the present invention is achieved in that a kind of lens, has:
One bottom surface;
One in order to receive the incidence surface that light source emits beam;
One is used as the first convex surface of the first exiting surface;
One is used as the first annular chamfer of the second exiting surface;
One is used as the second convex surface of the 3rd exiting surface;
Wherein, described first exiting surface, the second exiting surface are sequentially connected from top to bottom, from the inside to the outside with the 3rd exiting surface; Second exiting surface connects with the 3rd exiting surface formation first stage; Described incidence surface is inner concave arc surface, and tangent line and its rotating shaft of this inner concave arc surface bus intersect the first angle; Described first exiting surface is umbilicate convex surface, and tangent line and its rotating shaft of this convex surface bus intersect the second angle; Described second exiting surface and bottom surface intersect the 3rd angle; Described 3rd exiting surface is convex outward, and the tangent line of this convex outward bus and its rotating shaft intersect the 4th angle.
Another object of the embodiment of the present invention is to provide a kind of LED-backlit module, comprises multiple LED, and described backlight module adopts said lens, and each LED coordinates with described lens.
Another object of the embodiment of the present invention is to provide a kind of display unit, and described display unit adopts said lens.
The light that the embodiment of the present invention is sent by incidence surface reception light source, after the light that light source sends enters lens, wherein some light directly goes out from a certain exiting surface refraction, another part light first reflexes to other exiting surface or bottom surface through a certain exiting surface, by other exiting surface or bottom reflection to other exiting surface, finally go out from the refraction of other exiting surface, the light that light source sends is broken up by such elder generation in lens, each light is made to go out from the different exiting surface refraction of lens again, with this enlarging lighting area, and uniformity is good.Therefore, these lens are applicable to various LED-backlit module and display unit especially.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The light that the embodiment of the present invention is sent by incidence surface reception light source, after the light that light source sends enters lens, wherein some light directly goes out from a certain exiting surface refraction, another part light first reflexes to other exiting surface or bottom surface through a certain exiting surface, by other exiting surface or bottom reflection to other exiting surface, finally go out from the refraction of other exiting surface, the light that light source sends is broken up by such elder generation in lens, each light is made to go out from the different exiting surface refraction of lens again, with this enlarging lighting area, and uniformity is good.
Be that light source is described in detail realization of the present invention below with LED.
As shown in Fig. 1 ~ 5, the lens that the embodiment of the present invention provides have a bottom surface 10, is used as the 3rd exiting surface 3 the second convex surface in order to the first annular chamfer and that the first convex surface, that the incidence surface 9, receiving light source 8 and emit beam is used as the first exiting surface 1 is used as the second exiting surface 2, and wherein said first exiting surface 1, second exiting surface 2 is sequentially connected from top to bottom, from the inside to the outside with the 3rd exiting surface 3; Second exiting surface 2 connects with the 3rd exiting surface 3 formation first stage; Described incidence surface 9 is inner concave arc surface, and tangent line and its rotating shaft OP of this inner concave arc surface bus intersect the first angle; Described first exiting surface 1 is umbilicate convex surface, and tangent line and its rotating shaft OP of this convex surface bus intersect the second angle; Described second exiting surface 2 intersects the 3rd angle with bottom surface 10; Described 3rd exiting surface 3 is convex outward, and tangent line and its rotating shaft OP of this convex outward bus intersect the 4th angle.The light that LED light source sends is received herein by described incidence surface 9, after described LED light source 8 emits beam and enters lens, wherein some light is (as light P1, P3) directly go out from a certain exiting surface refraction, another part light first reflexes to other exiting surface or bottom surface through a certain exiting surface, by other exiting surface (as light P5) or bottom surface (as light P2, P4) other exiting surface is reflexed to, finally go out from the refraction of other exiting surface, the light that light source 8 sends is broken up by such elder generation in lens, each light is made to go out from the different exiting surface refraction of lens again, with this enlarging lighting area, and uniformity is good.
Usually, described first angle (i.e. the described tangent line of inner concave arc surface bus and the angle of its rotating shaft) reduces from top to bottom.Particularly, the amplitude that reduces is fixed with LED light source uniformity or light source directivity, that is the design of the angle of the tangent line of inner concave arc surface bus and its rotating shaft need consider the parameters such as below LED light source exiting surface angle and height.Generally speaking, LED light source exiting surface angle is larger or uniformity is better, the tangent line of inner concave arc surface bus and the angle of its rotating shaft less.
Described second angle (i.e. the described tangent line of the first convex surface bus and the angle of its rotating shaft) first increases and then decreases from the inside to the outside in the embodiment of the present invention.Particularly, described first convex surface 1 intermediate recess, Depression Centers is a singular point (being equivalent to catastrophe point), the tangent line of this convex surface bus and the angle of its rotating shaft OP progressively reduce along outward direction after central point 90 ° of elder generations sharply increase from the inside to the outside, and it increases with reducing amplitude and light source uniformity and light source, and to launch size relevant.
Aforementioned second exiting surface 2 is less than 45 ° with the angle of bottom surface 10, incident ray can be made like this refraction more easily to occur and more disperse, and depart from rotating shaft, disperse reflection ray by this, avoids light to concentrate, causes central bright spot, thus reach the object of homogenising light.In addition, described 4th angle (the described tangent line of the 3rd exiting surface bus and the angle of its rotating shaft) increases from top to bottom, and evenly launch light by this, its best angle need depending on LED exiting surface size or angle.
Lens described in the embodiment of the present invention also have the 3rd convex surface or the round table surface that second annular chamfer and being used as the 4th exiting surface 4 is used as the 5th exiting surface 5.Wherein, described 4th exiting surface 4 connects with the 3rd exiting surface 3, and the 4th exiting surface 4 connects with the 5th exiting surface 5 the second stage formed in order to diffusing light; Described 4th exiting surface 4 and the angle of bottom surface 10 are less than the angle of the second exiting surface 2 and bottom surface 10; When described 5th exiting surface 5 is convex outward, the tangent line of this convex outward bus and the angle of its rotating shaft increase from top to bottom.5th exiting surface 5 described herein can also be round table surface, is beneficial to lens shaping.
As shown in Figure 6, long-pending larger for making described light source 8 emit beam after the outgoing of these lens, uniformity is better, establishes to be connected the 3rd stage formed by the 3rd annular chamfer and the 4th convex surface in described lens profile.Wherein said 3rd annular chamfer is used as the 6th exiting surface 6, and described 4th convex surface is used as the 7th exiting surface 7, and described 6th exiting surface 6 connects with the 5th exiting surface 5, and described 6th exiting surface 6 and the angle of bottom surface 10 are less than the angle of the 4th exiting surface 4 and bottom surface 10; When described 7th exiting surface 7 is convex outward, the tangent line of this convex outward bus and the angle of its rotating shaft increase from top to bottom.Light in such lens will disperse more, increase accordingly lighting area, and uniformity strengthens.Certainly, the 7th exiting surface 7 described herein can also be round table surface, is beneficial to lens shaping.
Bottom surface 10 described in the embodiment of the present invention is for having the plane of three-dimensional structure, described three-dimensional structure is specially pyramid, circular cone, Part-spherical, cylinder or prism circle/groove, thus strengthen further light break up effect in lens, promote the uniformity of bright dipping further.If when said light source is LED, can be made into LED-backlit module by multiple LED and the lens that mate with each LED.
This lens material can be made up of following transparent material, as glass, pottery, or polymerizable material, as polytetrafluoroethylene (PTFE) (polytetrafluoroethylene, PTFE), methyl methacrylate (PMMA), PEMA, Merlon, silicone and other polymeric blends, technique can injection moulding or pressing mold be shaped, and is beneficial to these lens so shaping.Wherein, described incidence surface 9 indent, its symmetry axis is lens axis.
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.