CN203823656U - Low-angle lens used for light distribution of multiple LEDs and lamp thereof - Google Patents

Abstract

The utility model discloses a low-angle lens used for light distribution of multiple LEDs and a lamp thereof. The low-angle lens comprises a refracting curved surface, a reflecting curved surface and a light-emitting surface. LED light sources are distributed in an array and an LED light source array is externally covered by the refracting curved surface. The reflecting curved surface is externally connected to the refracting curved surface in a sleeving mode and has a focus superposed with a virtual focus of the refracting curved surface. The light-emitting surface is a fly-eye lens array formed by staggered arrangement of micro protruding spherical surfaces. The lamp comprises the LED light sources distributed on an aluminum substrate in an array and the lens made to be complementary to the light sources. The low-angle lens used for light distribution of the multiple LEDs and the lamp thereof have following beneficial effects: light distribution of the multiple miniwatt LED light sources by one lens is achieved; purposes of saving materials and reducing dimension of the lamp are fulfilled; and effects of low-angle light distribution and uniform illumination of light spots are exerted.

Description

A kind of low-angle lens and light fixture thereof for plurality of LEDs luminous intensity distribution

Technical field

The utility model relates to lighting technical field, particularly a kind of low-angle lens for plurality of LEDs luminous intensity distribution and have the light fixture of these lens.

Background technology

Existing LED lamp luminous intensity distribution is mainly to adopt a LED lamp pearl to join the mode of lens, and particularly low-angle luminous intensity distribution, adopts in this way especially.And light fixture generally all forms powerful light source by plurality of LEDs lamp pearl, adopt man-to-man light-configuration mode simultaneously, this just causes a light fixture the inside to have a plurality of lenslets, and the size of the lens module being comprised of a plurality of lenslets will be very large, this just causes the size of whole light fixture to be difficult to do small and exquisitely.

If plurality of LEDs lamp pearl shares lens, can greatly reduce the quantity of light fixture the inside lens, effectively the size of reducing glass module, reduce the consumption of optical material, reduce manufacturing cost, finally reduce the material cost of whole lamp, and the size of whole light fixture also can diminish.But the single low-angle lens that almost do not form in the market light source module for many low-power LED light sources.

For the COB lens of COB light source design and be not suitable for light source die group, because COB light source is that face is luminous, and the discrete light-emitting area that light source module is comprised of many low power LED light sources, if COB lens are applied on light source module, the hot spot that throws light on has defect, and light distribution angle is also difficult to do little.

As seen from the above analysis, if adopt the luminous intensity distribution of the light fixture of many low power LED light sources to adopt a LED lamp pearl to join the mode of lens, have that lens numbers is many, size is large, the shortcoming of waste lens material, but the existing lens of developing for COB light source cannot be applied to again on the light source module of plurality of LEDs small light source composition.

Utility model content

The purpose of this utility model is to overcome the existing deficiency of prior art, for current many low-power LED light sources, adopt light-configuration mode one to one to cause lens sizes large, the shortcoming that optical material consumption is many, provide a kind of reasonable in design, simple, applicable to the low-angle lens of plurality of LEDs light source light distribution.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:

A kind of low-angle lens for plurality of LEDs luminous intensity distribution, comprise LED light source, also comprise refraction curved surface, reflecting curved surface and exiting surface, described LED light source is arranged in array, the light that refraction curved surface covers at the some place's outgoing of LED light source array Wai Yijiang LED light source array center converges at a virtual focus point, it is outer the light of light source become to parallel rays and to penetrate through exiting surface that described reflecting curved surface is socketed on refraction curved surface, the focus of this reflecting curved surface overlaps with the virtual focus point of refraction curved surface, described exiting surface be by small protruding sphere Heterogeneous Permutation, formed for changing the fly eye lens array of the shooting angle of parallel rays.

Further, the height of described fly eye lens array is 0.05～0.08mm.

Further, the virtual focus point of described refraction curved surface and the focus of reflecting curved surface are positioned on the axis of reflecting curved surface.

Further, described refraction curved surface is free form surface.

Further, described refraction curved surface is the curved surface with up-narrow and down-wide space being formed around fixed axis revolution by bus, and its bus is wave-like line.

Further, described reflecting curved surface is a parabola.

Further, described LED light source is donut array or rectangular array is arranged.

Further, described refraction curved surface, reflecting curved surface and exiting surface are formed in one.

Further, described refraction curved surface, reflecting curved surface and exiting surface adopt that optical-grade transparent is plastic injection-moulded to be formed.

Another object of the present utility model is for the light fixture size of existing assembling plurality of LEDs lamp pearl large, optical material consumption is many, the problem that manufacturing cost is high, a kind of light fixture that adopts above-mentioned low-angle lens is provided, it comprise LED light source and with the low-angle lens of light source adaptation, described LED light source is arranged in array and is welded on aluminium base, described low-angle lens comprise refraction curved surface, reflecting curved surface and exiting surface, refraction curved surface covers at outside LED light source array, for the light of LED light source array center point place's outgoing is converged to a virtual focus point, it is outer for the light of light source being become to parallel rays and penetrating through exiting surface that described reflecting curved surface is socketed on refraction curved surface, the focus of this reflecting curved surface overlaps with the virtual focus point of refraction curved surface, described exiting surface is for changing the shooting angle of parallel rays, it is the fly eye lens array consisting of small protruding sphere Heterogeneous Permutation.

Compared with prior art, the beneficial effects of the utility model have following some: use the utility model can realize a plurality of LED light sources and share lens, lens sizes is reduced, can realize the compact design of light fixture, save light fixture material; With respect to the lens for COB light source design, the utility model can be realized less angle design, realizes the uniform effect of light spot illumination simultaneously.

Accompanying drawing explanation

Fig. 1 is stereogram of the present utility model;

Fig. 2 is top view of the present utility model;

Fig. 3 is cutaway view of the present utility model;

Fig. 4 is that light is through the schematic diagram that moves towards of lens reflection and reflection.

The specific embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but is not the restriction to the utility model structure.

Embodiment 1

Refer to Fig. 1, it is explosive view of the present utility model.The utility model comprises LED light source 2, refraction curved surface 14, reflecting curved surface 13 and exiting surface, and refraction curved surface, reflecting curved surface and exiting surface adopt that optical-grade transparent is plastic injection-moulded to be formed and one-body molded.LED light source 2 is welded on aluminium base 3, is arranged in array simultaneously, and such as donut array, rectangular array etc.

Please refer to Fig. 2～3, Fig. 3 is the longitudinal sectional view of the utility model low-angle lens.Lens mainly consist of refraction curved surface 14, reflecting curved surface 13 and exiting surface.Wherein, refraction curved surface 14 covers at LED light source array, and for the light of LED light source array center point place's outgoing is converged to a virtual focus point, this virtual focus point is positioned on the axis of reflecting curved surface 13.Reflecting curved surface 13 is socketed on outside refraction curved surface, and for the light of light source being become to parallel rays and penetrating through exiting surface, reflecting curved surface is a parabola.

In order to realize goal of the invention, refraction curved surface 14 is up-narrow and down-wide free form surface, and it is the curved surface with up-narrow and down-wide space being formed around fixed axis revolution by bus, and its bus is wave-like line.The bus that reflects curved surface is that the segmental arc by two sections of opposite directions is formed by connecting, and this two segmental arc is outward-dipping from top to bottom.

The focus of this reflecting curved surface overlaps with the virtual focus point of refraction curved surface, is positioned on the axis of reflecting curved surface.It is upper that the light sending in order to ensure LED light source converges at virtual focus point O ' after 14 refractions of refraction curved surface, and the bus that reflects curved surface need meet following vector correlation formula (1):

If:

O point coordinates is (a, b), and wherein O is the central point of LED light source array on the section through axis Z;

O ' point coordinates is that (0, c), wherein O ' is virtual focus point;

Q point coordinates is (d, 0);

Refraction surface equation is z=f (x);

Incident medium refractive index is no;

Refractive medium refractive index is ni;

: from O point, inciding the unit vector of any plane of refraction can be expressed as:

$\stackrel{\→}{I}=(\frac{x-a}{\sqrt{{(x-a)}^2+{(z-b)}^2}},0,\frac{z-b}{\sqrt{{(x-a)}^2+{(z-b)}^2}})$

Because of refracted ray all pass through virtual focus point (0, c), the unit vector of refracted ray is:

$\stackrel{\→}{o}=(\frac{x}{\sqrt{x+{(z-c)}^2}},0,\frac{z-c}{\sqrt{x+{(z-c)}^2}})$

Refraction curve equation is z=f (x), and the unit normal vector of refraction curve can be expressed as:

$\stackrel{\→}{N}=(\frac{f\text{'}\left(x\right)}{\sqrt{1+{(f\text{'}\left(x\right))}^2}},0,\frac{1}{\sqrt{1+{(f\text{'}\left(x\right))}^2}})$

Incident ray unit vector, refracted ray unit vector, refraction curved surface unit normal vector has following relational expression (1):

$\mathrm{no}\×\stackrel{\→}{o}-\mathrm{ni}\×\stackrel{\→}{I}=[{\mathrm{no}}^2+{\mathrm{ni}}^2-2\×\mathrm{no}\×\mathrm{ni}\×(\stackrel{\→}{o}\·\stackrel{\→}{I}){]}^{1/2}\×\stackrel{\→}{N}$

Wherein:

O point coordinates point (a, b) is according to the actual size of LED light source and be arranged as known;

The coordinate of O ' point be (0, c), wherein c value can preset, its value can be on the occasion of or negative value;

The coordinate that Q is ordered is (d, 0), and wherein d value can preset according to arranging of LED;

Through Q point and the curvilinear equation that meets vector correlation formula (1), be the bus that reflects curved surface.

Exiting surface be by small protruding sphere Heterogeneous Permutation, formed for changing the fly eye lens array of the shooting angle of parallel rays, comprise that the first exiting surface 111 and the second exiting surface 112 form.The height of fly eye lens array is 0.05～0.08mm.As Fig. 3, exiting surface has the cone-shaped space 12 of a depression, and its effect is the consumption of saving optical material.Exiting surface 112 is positioned at the bottom of cone-shaped space 12.

Refer to Fig. 4, it moves towards schematic diagram for light after lens reflection and reflection.Wherein, Z is the axis of the utility model lens, because described LED light source 2 is the array of source around axis Z circumferential arrangement, so the center of all LED light sources is all positioned on same circumference.Wherein O is the central point of LED light source array on the section through axis Z, the light sending from central point O can converge at virtual focus point O ' after 14 refractions of refraction curved surface, this virtual focus point O ' is positioned on axis Z, the focus of reflecting curved surface 13 overlaps with virtual focus point O ', so incide the Z outgoing of paralleling to the axis of light on reflecting surface 13, light by central point O outgoing becomes directional light after plane of refraction 14 refractions and reflecting curved surface 13 reflections, when parallel light emergence arrives exiting surface, because exiting surface is comprised of small protruding sphere Heterogeneous Permutation, directional light will be upset, becoming with axis Z has the light of certain angle to penetrate, thereby make the hot spot of accepting on face become more even, because of the height of small protruding sphere smaller, so the angle that directional light changes is very little, with this, realize low-angle luminous intensity distribution, guarantee to accept again the hot spot uniformity on face simultaneously.

Embodiment 2

As Fig. 1～4, the utility model also provides a kind of light fixture that assembles above-described embodiment 1 low-angle lens, comprise LED light source 2 and with the low-angle lens 1 of light source adaptation, LED light source 2 is arranged in array and is welded on aluminium base 3, described low-angle lens 1 comprise refraction curved surface 14, reflecting curved surface 13 and exiting surface, refraction curved surface 14 covers at outside LED light source array, for the light of LED light source array center point place's outgoing is converged to a virtual focus point, it is outer for the light of light source being become to parallel rays and penetrating through exiting surface that described reflecting curved surface 13 is socketed on refraction curved surface 14, the focus of this reflecting curved surface overlaps with the virtual focus point of refraction curved surface, described exiting surface is for changing the shooting angle of parallel rays, it is the fly eye lens array consisting of small protruding sphere Heterogeneous Permutation.

In the present embodiment, the structure of lens is identical with the lens arrangement described in embodiment 1, specifically can, with reference to described in embodiment 1, not repeat them here.

The utility model is not limited to above-mentioned embodiment, if various changes of the present utility model or distortion are not departed to spirit and scope of the present utility model, if within these changes and distortion belong to claim of the present utility model and equivalent technologies scope, intention of the present utility model also comprises these changes and distortion.

Claims (10)

1. low-angle lens for plurality of LEDs luminous intensity distribution, comprise LED light source, it is characterized in that: also comprise refraction curved surface, reflecting curved surface and exiting surface, described LED light source is arranged in array, the light that refraction curved surface covers at the some place's outgoing of LED light source array Wai Yijiang LED light source array center converges at a virtual focus point, it is outer the light of light source become to parallel rays and to penetrate through exiting surface that described reflecting curved surface is socketed on refraction curved surface, the focus of this reflecting curved surface overlaps with the virtual focus point of refraction curved surface, described exiting surface be by small protruding sphere Heterogeneous Permutation, formed for changing the fly eye lens array of the shooting angle of parallel rays.

2. low-angle lens according to claim 1, is characterized in that: the height of described fly eye lens array is 0.05～0.08mm.

3. low-angle lens according to claim 1, is characterized in that: the virtual focus point of described refraction curved surface and the focus of reflecting curved surface are positioned on the axis of reflecting curved surface.

4. according to the low-angle lens described in the arbitrary claim of claim 1～3, it is characterized in that: described refraction curved surface is free form surface.

5. low-angle lens according to claim 4, is characterized in that: described refraction curved surface is the curved surface with up-narrow and down-wide space being formed around fixed axis revolution by bus, and its bus is wave-like line.

6. low-angle lens according to claim 4, is characterized in that: described reflecting curved surface is a parabola.

7. low-angle lens according to claim 1, is characterized in that: described LED light source is donut array or rectangular array is arranged.

8. low-angle lens according to claim 1, is characterized in that: described refraction curved surface, reflecting curved surface and exiting surface are formed in one.

9. low-angle lens according to claim 8, is characterized in that: described refraction curved surface, reflecting curved surface and exiting surface adopt that optical-grade transparent is plastic injection-moulded to be formed.

10. a light fixture that is provided with low-angle lens described in claim 1, it is characterized in that: comprise LED light source and with the low-angle lens of light source adaptation, described LED light source is arranged in array and is welded on aluminium base, described low-angle lens comprise refraction curved surface, reflecting curved surface and exiting surface, refraction curved surface covers at outside LED light source array, for the light of LED light source array center point place's outgoing is converged to a virtual focus point, it is outer for the light of light source being become to parallel rays and penetrating through exiting surface that described reflecting curved surface is socketed on refraction curved surface, the focus of this reflecting curved surface overlaps with the virtual focus point of refraction curved surface, described exiting surface is for changing the shooting angle of parallel rays, it is the fly eye lens array consisting of small protruding sphere Heterogeneous Permutation.