CN104169776A - Improved optical systems and LED luminaires - Google Patents

Abstract

In this invention, the first refraction groove and the second refraction groove, which are located on two opposite ends of the reflection lens, are set on the same central axis. The said lens features a translucent shell and is of a horn-shaped appearance. The horn or cone-shaped mouth points from the first refraction groove to the second refraction groove. The outer surface is designed to have multiple reflection sections. When the LED light source is positioned at or in the first refraction groove, the light emitted from LED is refracted by the first refraction groove and then is sent out from the cone mouth at the second refraction groove. Meanwhile, the light which gets through the translucent lens shell is refracted by the multi-section reflection surface and then is also projected from the cone mouth. The reflection surface lens in this invention integrates multiple functions within the one body including focusing, refraction and reflection, which allows uniform illumination and other desired illumination effects without the need for any reflective coating. It simplifies the processing technique of LED illumination systems and reduces processing costs.

Description

Improved optical system and LED light fixture

Technical field

The present invention relates to novel lens, in particular, relate to a kind of lens that can significantly promote the optical efficiency of LED light fixture.

Background technology

As a kind of novel emulative solid light source in 21 century, LED lamp has the following advantages: high-level efficiency, and pure photochromic, low energy consumption, the life-span is long, reliability and durability, pollution-free, and controls flexibly.Along with updating of LED technology, the luminous flux of LED light fixture and optical efficiency will constantly improve.At present, more than the luminous flux of single white light LEDs has reached 2000Im.Quantity as the illuminator of the LEDs of light fixture increases rapidly.The light sending from LED chip distributes and projects with lambert (Lambertian).In most of the cases, if in when application not by suitable optical system processing, when such optical field distribution is used in light fixture, can not meet performance requirement.Therefore, the secondary optical design of the illuminator of LED light fixture is indispensable.

Secondary optical design can form in target area the hot spot with Uniform Illumination, thereby illuminator can realize Uniform Illumination.Illuminator is generally divided into reflection-type, refractive and reflected refraction mixed type.Wherein, this mixed type mainly adopts TIR (total internal reflection) technology.In general, due to LED to go out optical range wide, reflection-type or refractive are difficult to control all bright dippings of LED.On the other hand, TIR technology can be given full play to refraction and total reflection, and effectively assembles most of bright dippings of LED, and controls beam distribution, thereby ensures the compact conformation of illuminator.

The LED lens of existing reflection-type have antiradar reflectivity, by being 80%.Due to the restriction of condition, as lens diameter, the transmittance of the LED lens of refractive is low to moderate 90%.The LED lens of existing reflected refraction mixed type generally have independent refraction and reflecting part, and these parts have increased the job sequence of technical costs and LED lamp.But the reflecting surface of existing reflecting part requires reflectance coating, such as aluminum coating, this has also increased the technical costs of LED lamp.

As shown in figure 10, application 200910108644.1 is LED collector lens.Although this collector lens has two refraction grooves,, lens do not have reflector design, and therefore, it does not have good illumination effect.

Summary of the invention

A kind of optical system of LED light fixture is provided according to claim 1 according to a first aspect of the invention.Therefore, the invention provides a kind of optical system, comprising:

(i) the roughly cone of being made by transparent or semitransparent material, described cone has the first narrow end, the second wide end, and outside surface, described outside surface is designed to substantially completely to described pyramidal the second end reflected light, and described cone has the main shaft that extends to the second end from first end;

(ii) be positioned at depression or the groove of described pyramidal first end, described depression or groove are suitable for holding LED light fixture;

It is characterized in that, described pyramidal outside surface comprises multiple reflectings surface or reflecting surface.

Such optical system is constructed the light that LED light fixture is sent and is focused into light beam, with respect to traditional optical system, it is dazzling fewer that this bundle light produces, wherein, described optical system structure is preferably formed by integral material, the refractive index of described material is higher than the refractive index of air, thus generation total internal reflection.

Preferably, described reflecting surface covers described pyramidal whole outside surface substantially.

Preferably, the bottom or the inside surface that are positioned at the depression of described pyramidal first end are nonplanar.Compared with other situation, this situation has caused more light by reflecting or reflecting on the reflecting surface that is directly directed to optical system outside surface.

Preferably, the inside surface of described depression comprises multiple lens surfaces, and described lens surface is suitable for dispersing any light that drops on concave bottom surface.

Preferably, the form of described multiple lens surfaces is a series of convex projections, and more preferably, the form of described multiple lens surfaces is multiple convex reflecting surfaces, and described convex reflecting surface connects around the outside surface of cone successively.Other forms that can be used in the reflecting surface in this context comprise cambered surface without limitation, plane, and lozenge, diamond surface or other any shapes, these shapes can reach and will reflect the required effect of pyramidal the second end from the light of LED light fixture.

Preferably, the radius of reflecting surface increases to the second end of cone gradually from the first end of cone.

Preferably, the plurality of mirror lens surface is round the main shaft of described cone with layered arrangement, and more preferably, the radius of these reflecting surfaces that connect successively increases to the second end gradually from described pyramidal first end.Have implication widely at this term " radius ", comprise the distance through reflecting surface, described reflecting surface is not generally circular.

Preferably, described optical system also comprises the depression or the groove that are positioned at described pyramidal the second end.Described the second depression causes more light reflection or is refracted in described pyramidal reflective outer surface, otherwise these more light will directly be sent out described optical system.

Preferably, described optical system also comprises one or more LED light fixtures.

According to a second aspect of the invention, providing a kind of comprises according to the LED light fixture of the secondary optical system of the first invention.

The reflecting surface that the present invention proposes is included reflection function in common refractor in, and this can reach good reflecting effect in the situation that not needing to apply reflectance coating, and has simplified the structure of LED light fixture.In addition, reflecting surface lens energy global formation of the present invention, compared with existing refraction reflection hybrid lens, it has simpler structure.The reflecting surface that has been divided into multiple sections can better more effectively utilize the light sending from LED.

The present invention adopts following technical scheme.In reflecting surface lens, lay respectively at the first refractive groove of two opposite ends of described mirror lens or depression and the second refraction groove or depression and be arranged on same central shaft.Described lens adopt translucent shell, and tapered appearance.The opening of cone points to the second refraction groove from first refractive groove.Outside surface is designed to have multiple reflection sections.

Term described here " cone " has implication widely, and comprises frustum or truncated cone, or any general angular structure.The outside surface of described cone is generally multiaspect.

In the time that LED light source is placed on first refractive groove, the light that LED sends reflects by described first refractive groove, then projects away from cone opening at the second refraction groove., reflected by multi-segmental reflecting surface by the light of translucent lens shell meanwhile, then also project away from cone opening part.The LED that reflecting surface lens of the present invention send can reach various required illuminating effects, and this is to reach by traditional LED lens.

Further, above-mentioned multi-segmental reflecting surface is in turn connected into taper and is formed by multi-turn reflecting surface.,, on the direction from first refractive groove to the second refraction groove, the radius of the reflecting surface connecting successively increases gradually, to form taper.In one is better designed, every circle reflecting surface is formed by the multiple reflector elements that connect successively.Described reflector element can be various shapes, comprises without limitation cambered surface, plane, and the face of rhombus, diamond face, or other can reach the shape of required effect.Specific shape can design according to refraction and reflecting effect and law of conservation of energy.

Mirror lens of the present invention is one-body molded, simple in structure.It has reflection function and without any need for reflectance coating; This contributes to the installation of LED light fixture.Multi-segmental reflecting surface on the outside surface of translucent shell has good gathering and reflecting effect, thereby the various required illuminating effect of LED light fixture is provided.

In a word, in the present invention, be positioned at first refractive groove and the second refraction groove of two opposite ends of mirror lens, be arranged on same central shaft.Described lens adopt translucent shell, and its outward appearance is trumpet type.Trumpet type or tapered opening are pointed to the second refraction groove from first refractive groove.Outside surface is designed to have multiple reflection sections.When LED light source is positioned at or during at first refractive groove, the light that LED sends by the refraction of first refractive groove after, send from cone opening at the second refraction groove.Meanwhile, after being reflected by multi-segmental reflecting surface by the light of translucent shell, also project from cone opening.Reflecting surface lens of the present invention integrally combine several functions, comprise focusing, refraction and reflection, and make is having uniform illumination and other required illuminating effect under reflectance coating.The process technology that this has simplified LED illuminator, has reduced processing cost.

Brief description of the drawings

Fig. 1 has shown the distribution curve of the relative light intensity of LED chip;

Fig. 2 has shown the structural principle of reflecting surface lens of the present invention;

Fig. 3 has shown the illumination of incident light source on objective plane in the present invention;

Fig. 4 has shown the design concept of multi-segmental reflecting surface of the present invention;

Fig. 5 is the cut-open view of the embodiment of the present invention 1;

Fig. 6 is the simulate effect figure that carries out the lens illumination data of the embodiment of the present invention 1;

Fig. 7 is the simulation curve figure of the lens illumination data in the embodiment of the present invention 1;

Fig. 8 is the front perspective view of the structure of the embodiment of the present invention 2;

Fig. 9 is the schematic diagram of the outer surface structure of the embodiment of the present invention 2;

Figure 10 is the schematic diagram of prior art LED concentrator lens structure;

Figure 11 is the schematic cross-section of the optical system of the second embodiment of the present invention;

Figure 12 is the vertical view of the optical system of Figure 11;

Figure 13 is the schematic cross-section of the optical system of further embodiment;

Figure 14 is the vertical view of the optical system of Figure 13.

In Figure 11 and 12, numeral represents respectively:

11-frustum

12-right cylinder

13-cylinder shape groove

14-spherical surface

15-spherical

16-right cylinder.

In Figure 13 and Figure 14, numeral represents respectively:

11' – frustum

12' – annulus

13' – cylinder shape groove

14' – spherical surface

15' – spherical.

In Fig. 8 and 9, numeral represents respectively: 1, first refractive groove; 2, the second refraction groove; 3, multi-segmental reflecting surface; 4, lens case; 41, lens outer surface; 42, interdependent limit.

Embodiment

The following description, in conjunction with the accompanying drawings and embodiments only for for example, not for limiting derivative example of the present invention.

As shown in Figure 8 and Figure 9, first refractive groove 1 and the second refraction groove 2 are separately positioned on two ends of described mirror lens, and they are positioned on same central shaft, and are cylindrical.Lens case 4 is translucent, and outside surface 41 is taper.Cone opening points to described the second refraction groove 2 from described first refractive groove 1.Multi-segmental reflecting surface 3 is arranged on outside surface 41.

In the time that LED is positioned at first refractive groove 1, the light that LED sends is reflected by described first refractive groove 1, and projection is through cone opening, and described the second refraction groove 2 is positioned at described cone opening.Light through lens case 4 is reflected by the multi-segmental reflecting surface 3 of taper, also projects through cone opening.Described trnaslucent materials can be silica gel, PMMA, and PC, glass or other trnaslucent materials, such as semi transparent material, but be not limited to above-mentioned trnaslucent materials.

In an important embodiment, it is nonplanar being positioned at the depression of cone first end or the bottom of groove or inside surface.Compared with other situation, this causes more light by reflecting or reflecting on the reflecting surface on the outside surface that is reflected or is refracted to optical system.For example, described groove can be cylindrical depression, and the bottom of described depression or inside surface comprise multiple lens surfaces, and described lens surface is used for dispersing any lip-deep light of described concave bottom that drops on.In external form, while watching from the first end of described optical system, as a series of lip-deep pimples of concave bottom that are arranged in.

In addition or do alternately, also can provide and the similar lens surface being connected with depression or groove that is positioned at cone the second end.

In the present embodiment, the reflecting surface that described multi-segmental reflecting surface 3 is in turn connected into taper by multi-turn forms, than reflecting surface 31,32 and 33 as shown in Figure 8.,, on the direction from first refractive groove to the second refraction groove, the radius of the reflecting surface connecting successively increases gradually, to form taper.For example, the radius of reflecting surface 33 is less than the radius of reflecting surface 32, and the radius of reflecting surface 32 is less than the radius of reflecting surface 31.Every circle reflecting surface is formed by multiple reflector elements that connect successively.Described reflector element can be various shapes, comprises without limitation cambered surface, plane, and the face of rhombus, diamond face, or other can reach the shape of required effect.For example, the reflecting surface in Fig. 8 is formed by arc reflection unit 311,312,313 and 314.

The surface configuration of each reflector element can be according to required reflection of light and refraction effect and law of conservation of energy design.The method for designing of reflector element surface configuration will describe in detail below.

LED chip can be considered lambert (Lambertian) light source, and the light that described light source sends is cosine distribution.As shown in the distribution curve of the relative light intensity of LED chip in Fig. 1, transverse axis is light intensity; And the longitudinal axis is angle of radiation.If the youth of LED chip uncle light intensity distributions is known, the light intensity on assigned direction should be as follows:

In formula, Ι _θfor the light intensity on light surface in normal direction; l ₀for forming the optic angle degree of any angle Θ with normal.When LED chip is youth uncle light source, its brightness is in any direction constant, that is:

$L_{\mathrm{\θ}}=\frac{I_0}{\mathrm{dA}\cos \left(\mathrm{\θ}\right)}=\frac{I_0\cos \left(\mathrm{\θ}\right)}{\mathrm{dA}\cos \left(\mathrm{\θ}\right)}=\frac{I_0}{\mathrm{dA}}=L---\left(2\right)$

In this formula, dA is the cellar area on light surface.L is constant, represents chip brightness.Luminous flux in the measurements of the chest, waist and hips angular range of aperture angle Θ as the following formula shown in:

As shown in Figure 1, the light sending when LED chip covers sphere half, when 0=pi/2, and being calculated as follows of the total light flux of chip.

Reflecting surface lens of the present invention can meet the requirement of given emission angle, and can realize the various illuminating effects in specific region.The principle of lens arrangement as shown in Figure 2.

Lens design in the following manner.According to the illumination profile of objective plane and law of conservation of energy, obtain some point on curvilinear surface AB and multi-segmental reflecting surface EF.Subsequently, these points integrated and rotated, obtaining refraction curve surfaces A B and rhombus reflecting surface EF.

I. the design of refractive surface

Based on above analysis, as shown in Figure 3, from sent and dropped on the light curvilinear surface AB by light source, it is the Uniform Illumination of rO that scioptics provide radius on objective plane., radius r O can be from the given maximum angle ψ between the light and the optical axis that send, and obtains apart from I.

According to law of conservation of energy, calculate the brightness of the Uniform Illumination being formed by light on objective plane, described light is sent by light source, and drops on curvilinear surface AB.

$E_1=\frac{\mathrm{LA}\sin \left({\mathrm{\θ}}_1\right)}{r_0^2}---\left(6\right)$

In formula, the brightness that L is light source, the area that A is light source, the θ ι angle, light aperture of sending corresponding to the light source center of a B of serving as reasons.The value of θ ι should guarantee that the ordinate of a B is at least maximum sized 5 times of light source.

The light being sent by light source center, aperture angle is Θ drops on the some P on curvilinear surface AB, and then scioptics drop on the some T on objective plane.By law of conservation of energy, being calculated as follows of ordinate of some T.

Then, obtain ω by formula below:

$y_t=\frac{\ln \sin \left(\mathrm{\ω}\right)}{\sqrt{1-n^2{\sin }^2\left(\mathrm{\ω}\right)}}---\left(8\right)$

Formula calculated curve surfaces A B by is below at a derivative at P place.

$\frac{\mathrm{dy}}{\mathrm{dx}}=-\frac{n\cos \left(\mathrm{\ω}\right)-\cos \left(\mathrm{\θ}\right)}{n\sin \left(\mathrm{\ω}\right)-\sin \left(\mathrm{\θ}\right)}---\left(9\right)$

Consider and y=(h+d+x) tan (θ), obtain the derivative of Θ in conjunction with formula (9).The ordinary differential equation of X and Θ is as follows:

$\frac{\mathrm{dx}}{\mathrm{d\θ}}=\frac{h+d+x}{[-\frac{n\cos \left(\mathrm{\ω}\right)-\cos \left(\mathrm{\θ}\right)}{n\sin \left(\mathrm{\ω}\right)-\sin \left(\mathrm{\θ}\right)}-\tan \mathrm{\θ}]{\cos }^t\mathrm{\θ}}---\left(10\right)$

In formula, h and d have implication as shown in Figure 3.The value of h should be at least maximum sized 5 times of light source, and ω is the root of equation (8).The starting condition of general formulae is Θ=0, x=-d.Separate ordinary differential equation with Runge-Kutta (Runge-Kutta), obtain the series of points on curved surface AB.

The design of II, total reflection surface

In order to simulate described multi-segmental reflecting surface, described multi-segmental reflecting surface EF is divided into two parts (as an example) R ₀e and R ₀f.As shown in Figure 4, by send and drop on curvilinear surface R by light source ₀light scioptics forming radius on E is r ₂uniform Illumination.By send and drop on curvilinear surface R by light source ₀light scioptics forming radius on F is the Uniform Illumination of r-ι.After overlapping, the light scioptics forming radius on objective plane that sends and drop on multi-segmental reflecting surface by light source is the Uniform Illumination of r-ι.

Based on above-mentioned analysis, corresponding to reflecting surface R ₀e and reflecting surface R ₀the brightness of the Uniform Illumination of F should equate.According to law of conservation of energy, send and drop on reflecting surface R by light source ₀e (or reflecting surface R ₀f) light on forms the brightness with Uniform Illumination on objective plane, as the following formula shown in:

$E_2=\frac{\mathrm{LA}[\mathrm{si}{n}^2\left({\mathrm{\θ}}_2\right)-s{\mathrm{in}}^2\left({\mathrm{\θ}}_1\right)]}{r_1^2+r_2^2}---\left(11\right)$

In formula, r ₁=r ₀+ H ₀0, r ₂=r ₀-H ₀, wherein, H ₀for R ₀ordinate, its value should be able to guarantee that a F is on line segment BN.θ ₂maximum angle between light and the optical axis sending for light source.

Fig. 4 has shown the design concept of multi-segmental reflecting surface.The angle that light source center sends is that the light of Θ drops on the some R on multi-segmental reflecting surface EF, and then scioptics arrive the some T on objective plane.Ordinate (the Y of point T _t) can obtain according to law of conservation of energy.

A R is placed on to multi-segmental reflecting surface R ₀on F.Now, some T is positioned at line segment T ₀on T-|.The ordinate of point T is as follows:

$y_t=\sqrt{H_0^2+\frac{\mathrm{LA}[{\sin }^2\left({\mathrm{\θ}}_2\right)-{\sin }^2\left(\mathrm{\θ}\right)]}{E_2}}---\left(12\right)$

When a R is positioned at described multi-segmental reflecting surface R ₀e is upper, and some T is positioned at line segment QiT ₀when upper, the ordinate of some T is as follows:

$y_t=\sqrt{H_0^2+\frac{\mathrm{LA}[{\sin }^2\left({\mathrm{\θ}}_3\right)-{\sin }^2\left(\mathrm{\θ}\right)]}{E_2}}---\left(13\right)$

In formula, θ ₃the light sending for light source is corresponding to a R ₀angle.If some T is positioned at line segment QiT ₂upper, the ordinate of some T is as follows:

$y_t=-\sqrt{\frac{\mathrm{LA}[{\sin }^2\left({\mathrm{\θ}}_3\right)-{\sin }^2\left(\mathrm{\θ}\right)]}{E_2}-H_0^2}---\left(14\right)$

Based on the ordinate of a T, obtain ω by formula below.

$y_t=\frac{\ln \sin \left(\mathrm{\ω}\right)}{\sqrt{1-n^2{\sin }^2\left(\mathrm{\ω}\right)}}---\left(15\right)$

The inverse (derivative) of multi-segmental surface, some R place EF is as follows:

Consider and y=H+ (h+d+x-H/tan (θ)), obtain tan φ and Θ.Based on formula (16), meet ordinary differential equation, obtain X and Θ:

$\frac{\mathrm{dx}}{\mathrm{d\θ}}=\frac{\frac{H\sqrt{n^2-{\cos }^2\left(\mathrm{\θ}\right)}}{{\sin }^2\left(\mathrm{\θ}\right)\cos \left(\mathrm{\θ}\right)}+[h+d+x-\frac{H}{\tan \left(\mathrm{\θ}\right)}]\frac{n^2\sin \left(\mathrm{\θ}\right)}{{\cos }^2\left(\mathrm{\θ}\right)\sqrt{n^2-{\cos }^2\left(\mathrm{\θ}\right)}}}{\frac{\cos \left(\mathrm{\θ}\right)-n\cos \left(\mathrm{\ω}\right)}{n\sin \left(\mathrm{\ω}\right)-\sqrt{n^2-{\cos }^2\left(\mathrm{\θ}\right)}}-\frac{\sqrt{n^2-{\cos }^2\left(\mathrm{\θ}\right)}}{\cos \left(\mathrm{\θ}\right)}}---\left(17\right)$

In formula, H is the ordinate of a B, and ω is the root of equation (15).The starting condition of ordinary differential equation is θ=θ ₃, x=x ₀, x ₀for a R ₀horizontal ordinate.Separate ordinary differential equation by Runge-Kutta (Runge-Kutta), obtain the point on multi-segmental reflecting surface EF.

The multi-segmental reflecting surface EF that is divided into two sections has been described above.It also can be divided into wireless segment by identical principle.

Embodiment 1

In embodiment 1 as shown in Figure 5, adopt the LED chip of 1mmx1mm as light source, its luminous flux is 1351m.Its light source forms the angle of divergence of 65 ° through after lens.Lens material is polymethylmethacrylate (PMMA), and is multi-segmental reflecting surface, and the detailed dimensions of described multi-segmental reflecting surface design as shown in Figure 5.Comprise two camber line line segments according to the multi-segmental reflecting surface 3 of said method design, that is, and curved reflection surface EF and curved reflection surface FG.Every camber line line segment also can be designed to multi-segmental camber line.Useful software program TracePro obtains simulated light figure and simulated data, as shown in Figure 6 and Figure 7.

Embodiment 2

Embodiment 2 as shown in Figure 8 and Figure 9, total reflection surface lens are one-body molded with trnaslucent materials.The inner side of cone opening be also solid with translucent.Columniform first refractive groove 1 is positioned at cone opening the inside, and the central shaft of its central shaft and cone is overlapping., first refractive groove 1 is arranged on the centre of cone opening just.Columniform the second refraction groove 2 is arranged on the back side of reflecting surface lens.The center line of it and first refractive groove is overlapping, and still, they do not interconnect.The multi-segmental surface 3 being positioned on the outside surface of reflecting surface lens is formed by reflecting surface 31,32 and 33.Along the direction from first refractive groove 1 to second refraction groove 2, the radius of these reflecting surfaces that connect successively increases gradually.Meanwhile, surface 31,32 reflector elements that are connected successively by several respectively with 33 311,312,313 and 314 form.Reflector element 31,32 and 33 is arc surface.According to the method for describing before, calculate the dot matrix of each arc surface.

The present invention proposes a kind of design concept of the Uniform Illumination from the new high-power LED with multi-segmental reflecting surface, and according to the luminescence feature of LEDs and law of conservation of energy, sets up ordinary differential equation.Described equation is used for obtaining the coordinate of series of points on multi-segmental reflecting surface, thereby on reflecting surface lens, creates multi-segmental reflecting surface.The light that described multi-segmental reflecting surface more effectively utilizes LED to send better.New type reflection surface lens have improved the efficiency of LEDs, and guarantee to export uniformity of light and various required illuminating effect.Along with the use of effective control and light, novel optical reflecting surface lens meet the requirement of high-level efficiency and environmental protection better, also meet the requirement of diversity and the diversity of current illumination market.

Further embodiment of the present invention as shown in FIG. 11 and 12, optical system is made up of the right cylinder (12) that is positioned at the frustum (11) of upper part and is positioned at lower part, and frustum (11) and right cylinder (12) are made by PMMA (polymethylmethacrylate).Frustum (11) and right cylinder (12) are combined into one.The upper end of frustum comprises cylinder shape groove (13), and in described groove (13), has the convex spherical (14) raising up; Outside is covered by spherical (15), and described spherical has identical size along same level circle, and the area of their (15) upwards reduces gradually from bottom.Described cylindrical outside also has the right cylinder (16) of protrusion.

The refraction of the cylinder shape groove (13) of the upper end by frustum (11) and cover the reflection of the spherical (15) in described frustum (11) outside, the light that LED light fixture sends finally reflects away by right cylinder (12); This has not only improved use and the efficiency of light significantly, has also guaranteed projection uniformity of light.

The second embodiment of the present invention is as shown in Figure 13 and 14.According to the present embodiment, the lens of LED light fixture or optical system are made up of with the annulus that is positioned at lower part the frustum that is positioned at upper part, and this frustum and annulus are made by PMMA (polymethylmethacrylate).Described frustum and loops integrator.The upper end of frustum is cylinder shape groove, has the convex spherical of downward protrusion at lower end.Outside is covered by spherical, and described spherical has identical size along same level circle, and their area upwards reduces gradually from bottom.

Can find out from Figure 13 and 14, the present embodiment is made up of the annulus (12') that is positioned at the frustum (11') of upper part and is positioned at lower part, and this frustum (11') and annulus (12') are made by PMMA (polymethylmethacrylate).Described frustum (11') and annulus (12') are combined into one.The upper end of described frustum is cylinder shape groove (13'), has the convex spherical (14') of downward protrusion at lower end.Outside is covered by spherical (15'), and described spherical (15') has identical size along same level circle, and better, their area upwards reduces gradually from bottom.

The refraction of the cylinder shape groove (13') of the upper end by frustum (11') and cover the reflection of the spherical (15') in described frustum (11') outside, the light that LED light fixture sends is finally to the lower part refraction of frustum.This has not only improved use and the efficiency of light significantly, has also guaranteed transmission uniformity of light.

The beneficial effect of this enforcement comprises: the refraction of the cylinder shape groove of the upper end by frustum and cover the reflection of the spherical in described frustum outside, the light that LED light fixture sends is finally to the lower part refraction of frustum.This has not only improved use and the efficiency of light significantly, has also guaranteed transmission uniformity of light.

Last point it should be noted that above-described embodiment is only used for illustrating technical scheme of the present invention.They do not limit the scope of the invention.Although preferred embodiment is described in detail the present invention,, the art personnel should be understood that the amendment of the technical program that is no more than the spirit and scope of the invention or equivalent substitution are feasible.

Claims (12)

1. for an optical system for LED light fixture, described optical system comprises:

(i) the roughly cone being formed by transparent or semitransparent material, described cone has narrow first end, wide the second end and outside surface, described outside surface is designed to light substantially fully to reflect towards the second end of described cone, and described cone has the main shaft that extends to described the second end from described first end;

(ii) be positioned at depression or the groove of described pyramidal described first end, described depression or groove are suitable for holding LED light fixture;

It is characterized in that, described pyramidal described outside surface comprises multiple reflectings surface or reflecting surface.

2. optical system according to claim 1, is characterized in that, described reflecting surface roughly covers described pyramidal whole outside surface.

3. optical system according to claim 1 and 2, is characterized in that, the bottom or the inside surface that are positioned at the described depression on described pyramidal described first end are nonplanar.

4. optical system according to claim 3, is characterized in that, the inside surface of described depression comprises multiple lens surfaces, and described multiple lens surfaces are suitable for making to drop on any light in the lower surface of described depression and disperse and come.

5. optical system according to claim 4, is characterized in that, the form of described multiple lens surfaces is a series of convex projections.

6. according to the optical system described in any one in claim 1-5, it is characterized in that, the described multiple reflectings surface on described pyramidal outside surface comprise the multiple reflecting surfaces that connect successively around the outside surface of described cone.

7. optical system according to claim 6, is characterized in that, the radius of described reflecting surface increases to described second end of described cone gradually from the described first end of described cone.

8. according to the optical system described in any one in claim 4-7, it is characterized in that, described multiple mirror lens surface is arranged as stratiform around the main shaft of described cone.

9. according to the optical system described in aforementioned any one claim, it is characterized in that, described lens combination also comprises depression or the groove of described the second end that is positioned at described cone.

10. according to the optical system described in aforementioned any one claim, it is characterized in that, described optical system also comprises one or more LED light fixtures.

11. combination in any by reference to the accompanying drawings, the optical system described herein.

12. 1 kinds of LED light fixtures, described LED light fixture comprises one or more optical systems as described in any one in claim 1-11.