CN102734673A - Light-emitting diode (LED) illumination module - Google Patents

Abstract

The invention relates to a light-emitting diode (LED) illumination module. The LED illumination module comprises an LED light source and a rotational symmetric single light-transmitting auxiliary optical structure, wherein the light-transmitting auxiliary optical structure comprises a flood lens group, a reflecting lens group and a blind hole opening; the LED light source is arranged at the opening; the opening comprises a concave bent basic surface and a conical circumferential surface and has circumferential diameter which allows the LED light source to relatively move along the optical axis of the light-transmitting auxiliary optical structure; the flood lens group comprises the basic surface and a convex aspheric surface; the reflecting lens group comprises the conical circumferential surface, a shell circumferential surface and a conical curved surface; a plurality of annular convex edges taking the optical axis as a central axis are arranged on the conical curved surface; light emitted by the LED light source is refracted and reflected by the flood lens group and the reflecting lens group and transmitted forwards at an angle of more than 90 degrees; and the LED light source moves along the optical axis to generate a light cone of which the conical angle is changed in the range of more than or equal to 10 degrees to less than or equal to 90 degrees.

Description

A kind of LED lighting module

Technical field

The present invention relates to optical technical field, more particularly, relate to a kind of LED lighting module.

Background technology

LED in the application of lighting field more and more widely for example is applied to flashlight.At present with optical system that LED matches in, great majority are to constitute parabolical concave mirror in that set inside is one or more, on the focus of concave mirror, design led light source.Adopt this set mode, can guarantee its best beam projecting efficient in theory.But along with the application of high-power LED light source at lighting field, flaw very easily appears in this type speculum light efficiency and hot spot.And such concave mirror advances dust easily or foreign material cause pollution, and specular surface is easily oxidized or corroded, and causes the exitance of light to descend.

In present flashlight; The general dual mode that adopts carries out luminous intensity distribution to high-power LED light source; A kind of for a collector lens is set on the light outgoing plane, it is arranged in the position that light is taken place under the situation on the focus of this collector lens, can realize the parallel ejaculation of light basically.Can move light source or lens vertically, thereby change the relative position of collector lens, cause it to change the characteristic of light beam within certain limit with respect to led light source.But this structure only can be utilized the light that penetrates forward, and side light is not utilized and causes the light inefficiency, and this kind structure also very easily produces imaging, and the light source that makes is presented on the object with the form of hot spot.

Another kind is in the lens bottom groove to be set, and led light source is embedded in the groove, and the light emission point fixed-site of led light source makes it in the optical axial scope, reflect into parallel light shafts towards the light that opening direction sends through collimator effect.But adopt this kind lens arrangement light distribution effect single, can not satisfy many-sided luminous intensity distribution demand.

Summary of the invention

The technical problem that the present invention will solve is, to the above-mentioned defective of prior art, provides a kind of and can produce uniform light spots and the high LED lighting module of the efficiency of light energy utilization.

The technical solution adopted for the present invention to solve the technical problems is:

Construct a kind of LED lighting module, comprise led light source and rotational symmetric single-piece printing opacity auxiliary optical structure; Wherein, said printing opacity auxiliary optical structure comprises floodlight lens set in the middle of being positioned at, the reflex reflector lens group around being positioned at and the blind hole shape opening that is positioned at the back side, and said led light source is arranged on said opening part; Wherein, said opening comprises the basal plane and the tapered circumferential surface of bow, and said opening has the circle diameter that allows said led light source to relatively move along the optical axial of said printing opacity auxiliary optical structure;

Said floodlight lens set comprises as the said basal plane of plane of light incidence with as the convex aspheric surface of beam projecting face;

Said reflex reflector lens group comprises said tapered circumferential surface as plane of light incidence, as the shell type periphery of light reflecting surface with as the conical camber of beam projecting face, it is the circular fin of central shaft with said optical axial that said conical camber edge is provided with a plurality of;

The light that is sent by said led light source is higher than 90% penetrate towards the place ahead after said floodlight lens set and refraction of said reflex reflector lens group and reflection, and moves along said optical axial through said led light source and to produce cone angle at the light cone that changes between smaller or equal to 90 ° more than or equal to 10 °.

LED lighting module of the present invention, wherein, the arbitrary tangent of said shell type periphery is 38 °～65 ° with respect to the inclination angle perpendicular to the vertical plane of said optical axial.

LED lighting module of the present invention, wherein, as the conical camber curvature of said reflex reflector lens group beam projecting face greater than curvature as the shell type periphery of said reflex reflector lens group light fully reflecting surface.

LED lighting module of the present invention wherein, is 7 °～20 ° as the arbitrary tangent of the conical camber of said reflex reflector lens group beam projecting face with respect to the inclination angle perpendicular to the vertical plane of said optical axial.

LED lighting module of the present invention, wherein, said opening narrowest diameter is greater than 5mm.

LED lighting module of the present invention, wherein, the tapered circumferential surface institute corresponding circle cone angle that constitutes said opening is less than 7 °.

LED lighting module of the present invention, wherein, said printing opacity auxiliary optical total height of structure is between 10.3mm and 21mm.

LED lighting module of the present invention, wherein, said basal plane curvature is greater than the convex aspheric curvature as said floodlight lens set beam projecting face.

LED lighting module of the present invention, wherein, as the maximum profile diameter of the maximum profile diameter of the convex aspheric surface of said floodlight lens set beam projecting face greater than said basal plane.

LED lighting module of the present invention, wherein, the height of said floodlight lens set with respect to the ratio of the total height of said printing opacity auxiliary optical structure between 0.25 and 0.55.

Beneficial effect of the present invention is: through setting have floodlight lens set in the middle of being positioned at, the reflex reflector lens group around being positioned at and the printing opacity auxiliary optical structure that is positioned at the blind hole shape opening at the back side; Led light source to being positioned at opening part carries out luminous intensity distribution; And led light source can move with respect to optical axial, to produce cone angle at the light cone that changes between smaller or equal to 90 ° more than or equal to 10 °, so that the light around making full use of; And to around the light dispersed play the effect of converging; Row secondary light filling during to main spot makes the hot spot of formation even, and improves the utilization rate of luminous energy.

Description of drawings

To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:

Fig. 1 is the LED lighting module structural representation of preferred embodiment of the present invention;

Fig. 2 is the LED lighting module vertical view of preferred embodiment of the present invention;

Fig. 3 is the LED lighting module cutaway view of preferred embodiment of the present invention;

Fig. 4 is the LED lighting module light path sketch map one of preferred embodiment of the present invention;

Fig. 5 is the LED lighting module light path sketch map two of preferred embodiment of the present invention;

Fig. 6 is the led light source surface of intensity distribution of preferred embodiment of the present invention.

The specific embodiment

The LED lighting module structure of preferred embodiment of the present invention such as Fig. 1, Fig. 2, shown in Figure 3 consult Fig. 4 and Fig. 5 simultaneously, and this LED lighting module comprises ledlight source 10 and rotational symmetric single-piece printing opacity auxiliary optical structure.Printing opacity auxiliary optical structure is a secondary optical system, comprises floodlight lens set 20 in the middle of being positioned at, the reflexreflector lens group 30 around being positioned at and the blind hole shape opening 40 that is positioned at the back side, and ledlight source 10 is arranged on opening 40 places.Wherein, opening 40 comprises thebasal plane 21 and taperedcircumferential surface 31 of bow, and opening 40 has the circle diameter that allows ledlight source 10 to relatively move along the optical axial 50 of printing opacity auxiliary optical structure;Floodlight lens set 20 comprises as thebasal plane 21 of plane of light incidence with as the convexaspheric surface 22 of beam projecting face; Theshell type periphery 32 of the reflecting surface that reflexreflector lens group 30 comprises taperedcircumferential surface 31 as plane of light incidence, reflect as light fully and as theconical camber 33 of beam projecting face, it is thecircular fin 34 of central shaft with optical axial 50 thatconical camber 33 edges are provided with a plurality of; The light that is sent by ledlight source 10 is higher than 90% penetrate towards the place ahead after floodlight lens set 20 and 30 refractions of reflex reflector lens group and reflection; And move along optical axial 50 throughled light source 10 and to produce cone angle at the light cone that changes between smaller or equal to 90 ° more than or equal to 10 °, the minimum diameter of tapered opening is more than or equal to 6mm.

Like Fig. 4 and shown in Figure 5, consult Fig. 1, Fig. 2 and Fig. 3 simultaneously, the light that sends from ledlight source 10 is divided into two parts and carries out luminous intensity distribution by rotational symmetric single-piece printing opacity auxiliary optical structure.Wherein, central ray is by floodlight lens set 20 luminous intensity distributions, and light is by reflexreflector lens group 30 luminous intensity distributions all around.Particularly; Most central ray is frombasal plane 21 incidents as floodlight lens set 20 planes of light incidence; Get in the lenticular body and reflect; When the convexaspheric surface 22 as floodlight lens set 21 beam projecting faces is divergent, carry out the refraction second time, the hot spot angle that promptly produces can with in printing opacity auxiliary optical structural base very big-difference is arranged.Light is incident to theshell type periphery 32 as the light reflecting surface from the taperedcircumferential surface 31 as plane of light incidence around most; After 32 total reflections of shell type periphery, penetrate the light around making full use of like this with approximate parallel direction again with optical axial 50 throughconical camber 33; And to around the light dispersed play the effect of converging; Row secondary light filling during to main spot makes the hot spot of formation even, and improves the utilization rate of luminous energy.

In addition, theoretically, when known ledlight source 10 in a lenticular body when optical axial 50 moves, can obtain the size variation of facula area.Because the LED luminescence chip all is a square mostly at present, if promptly can produce imaging in along, causes occurring tetragonal hot spot effect, this effect should be avoided as far as possible.Desirable situation is, ledlight source 10 can both produce the diameter difference in two focal positions of lens, but hot spot effect uniformly.Promptly require ledlight source 10 when the secondary optical lens bottom, the focus of above-mentionedfloodlight lens set 20 can be on ledlight source 10 luminous flat.

In the foregoing description; As depicted in figs. 1 and 2, through be similar to thecircular fin 34 of the lonely shape endless belt of Fresnel in conical camber 33 edge settings, make from the light ofconical camber 33 edge outgoing through thiscircular fin 34 further after the refraction; Penetrate with certain inclination angle; Converge to the center, can be used as the light intensity of center spot is replenished, also can avoid occurring secondary imaging.Can realize thus that ledlight source 10 moves to make at 1 meter in the secondary optical lens body can obtain a circular light spot by 17.5CM～100CM, avoids tetragonal hot spot to occur.

In the foregoing description; The total that is made up of ledlight source 10 and lamp socket can move to axial in blind hole shape opening 40; Makeled light source 10 with respect to of the relative motion of blind hole shape opening 10, to change the illumination characteristic and the lighting angle of light along optical axial 50.Wherein, can ledlight source 10 and lamp socket thereof be fixed, achieve the above object, adjustment facula area size through moving single-piece printing opacity auxiliary optical structure; Perhaps, move through 10 combinations of single-piece printing opacity auxiliary optical structure and led light source and realize.

In the foregoing description; All optical surfaces in the printing opacity auxiliary optical structure; Like Fig. 1, Fig. 2 and shown in Figure 3; Thebasal plane 21, convexaspheric surface 22, taperedcircumferential surface 31,shell type periphery 32 and theconical camber 33 that comprise bow, all preferentially select for use following aspheric surface equation (1) and calculating of the LED surface of intensity distribution and analogue simulation checking as shown in Figure 6 to draw:

$z=\frac{?b\±\sqrt{b^2?4ac}}{1+\sqrt{1?(1+k)c^2{r}^2}}+c_{1}r+c_2{r}^2+c_3{r}^3+\mathrm{...}+c_{29}{r}^{29}---\left(1\right);$

Wherein, R is the coordinate (x on the aspheric surface; Y) the corresponding spherical radius of loca, its computing formula is:

; The computing formula of said c is:

; Said R is aspheric vertex curvature radius; The concrete value of x, y and R can be set according to the design requirement of light fixture.

Further; If the arbitrary tangent ofshell type periphery 32 is excessive or too small with respect to the inclination angle perpendicular to the vertical plane of optical axial 50; Then possibly cause not reach the beam projecting rate and to be higher than 90% purpose fully by total reflection from the part side light that ledlight source 10 sends.Through a large amount of analogue simulation experiment proofs; The utilization that preferably but the arbitrary tangent ofshell type periphery 32 is designed to 38 °～65 ° of fullests with respect to the inclination angle perpendicular to the vertical plane of optical axial 50 wherein most preferably is 60 ° from the side light that ledlight source 10 sends; Simultaneously, preferably will be designed to 7 °～20 ° with respect to inclination angle as the arbitrary tangent of theconical camber 33 of reflexreflector lens group 30 beam projecting faces perpendicular to the vertical plane of optical axial 50; And preferably, will be asconical camber 33 curvature of reflexreflector lens group 30 beam projecting faces greater than curvature as theshell type periphery 32 of reflexreflector lens group 30 light fully reflecting surfaces.

Preferably; Printing opacity auxiliary optical total height of structure is between 10.3mm and 21mm; Blind hole shape opening 40 narrowest diameters are greater than 5mm, and 31 the corresponding circle cone angles of tapered circumferential surface that constitute opening 40 are less than 5 °, so that common LED light source and high-power LED light source all can move along optical axial 50 in opening; Big or small with adjustment institute's circular light spot that produced, the generation different optical characteristics.

For making the central ray that ledlight source 10 is sent reach the optimum light distribution effect of dispersing; Preferably; As shown in Figure 1, with thebasal plane 21 curvature design that constitutes floodlight lens set 20 planes of light incidence greater than curvature as the convexaspheric surface 22 of floodlight lens set 20 beam projecting faces; As the convexaspheric surface 22 maximum profile diameter of floodlight lens set 20 beam projecting faces maximum profile diameter greater than basal plane 21.Like this; The central ray that sends from ledlight source 10 carries out after the first time, refraction was dispersed throughbasal plane 10, and through convexaspheric surface 22 time, light beam draws in to the center comparatively speaking; Promptly the light after dispersing is played the effect of converging, to obtain emergent ray more uniformly.

Preferably, as shown in Figure 1 among above-mentioned each embodiment, the height h2 of floodlight lens set 20 with respect to the ratio of the total height h1 of printing opacity auxiliary optical structure between 0.25 and 0.55, more preferably 0.37.Reserve enough spaces so that move for ledlight source 10 along optical axial 50; Making can be as much as possible from taperedcircumferential surface 31 incidents from the light ofled light source 10 side outgoing; And after 32 total reflections of shell type periphery, reflect the light around making full use of, row secondary light filling during to main spot fromconical camber 33; Make the hot spot of formation even, improve the utilization rate of luminous energy.

LED lighting module among above-mentioned each embodiment can be applicable in various types of lighting devices, and for example flashlight or the like is not described at this one by one.

Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection domain of accompanying claims of the present invention according to above-mentioned explanation.

Claims (10)

1. a LED lighting module comprises led light source (10) and rotational symmetric single-piece printing opacity auxiliary optical structure; It is characterized in that; Said printing opacity auxiliary optical structure comprises floodlight lens set (20) in the middle of being positioned at, the reflex reflector lens group (30) around being positioned at and the blind hole shape opening (40) that is positioned at the back side, and said led light source (10) is arranged on said opening (40) and locates; Wherein, Said opening (40) comprises the basal plane (21) and the tapered circumferential surface (31) of bow, and said opening (40) has the circle diameter that allows said led light source (10) to relatively move along the optical axial (50) of said printing opacity auxiliary optical structure;

Said floodlight lens set (20) comprises as the said basal plane (21) of plane of light incidence with as the convex aspheric surface (22) of beam projecting face;

Said reflex reflector lens group (30) comprises said tapered circumferential surface (31) as plane of light incidence, as the shell type periphery (32) of light reflecting surface with as the conical camber (33) of beam projecting face, it is the circular fin (34) of central shaft with said optical axial (50) that said conical camber (33) edge is provided with a plurality of;

The light that is sent by said led light source (10) is higher than 90% penetrate towards the place ahead after said floodlight lens set (20) and said reflex reflector lens group (30) refraction and reflection, and moves along said optical axial (50) through said led light source (10) and to produce cone angle at the light cone that changes between smaller or equal to 90 ° more than or equal to 10 °.

2. LED lighting module according to claim 1 is characterized in that, the arbitrary tangent of said shell type circumference (32) face is 38 °～65 ° with respect to the inclination angle perpendicular to the vertical plane of said optical axial (50).

3. LED lighting module according to claim 1; It is characterized in that, as conical camber (33) curvature of said reflex reflector lens group (30) beam projecting face greater than curvature as the shell type periphery (32) of said reflex reflector lens group (30) light fully reflecting surface.

4. LED lighting module according to claim 1 is characterized in that, is 7 °～20 ° as the arbitrary tangent of the conical camber (33) of said reflex reflector lens group (30) beam projecting face with respect to the inclination angle perpendicular to the vertical plane of said optical axial (50).

5. LED lighting module according to claim 1 is characterized in that, said opening (40) narrowest diameter is greater than 5mm.

6. LED lighting module according to claim 1 is characterized in that, tapered circumferential surface (31) the institute corresponding circle cone angle that constitutes said opening (40) is less than 7 °.

7. LED lighting module according to claim 1 is characterized in that, said printing opacity auxiliary optical total height of structure is between 10.3mm and 21mm.

8. LED lighting module according to claim 1 is characterized in that, said basal plane (21) curvature is greater than convex aspheric surface (22) curvature as said floodlight lens set (20) beam projecting face.

9. LED lighting module according to claim 1 is characterized in that, as the maximum profile diameter of convex aspheric surface (22) of said floodlight lens set (20) the beam projecting face maximum profile diameter greater than said basal plane (21).

10. LED lighting module according to claim 1 is characterized in that, the height of said floodlight lens set (20) with respect to the ratio of the total height of said printing opacity auxiliary optical structure between 0.25 and 0.55.

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