CN201902993U - Novel LED illuminating optical lens - Google Patents

Abstract

The utility model discloses a novel LED illuminating optical lens, which comprises a refraction lens of a refraction portion and a reflection cup of a reflection portion. The refraction lens and the reflection cup are connected integrally; the bottom of the refraction lens is a recessed hemispherical opening; the upper surface of the refraction lens consists of a top end portion and a lower half portion; the top end portion is a free curved surface calculated according to special algorithm; the included angle reserved between a bounding circle of the top end portion and the central axis of the optical lens is 45 degrees; two lateral surfaces of the lower half portion are two arc surfaces concentric to the recessed hemispherical opening; the top surface of the lower half portion is a plane; the bottom bore of the reflection cup is overlapped with the bottom edge of the refraction lens; the radius of an opening at the upper end of a cup body of a reflector is equal to the height of the cup body; and the inner wall of the reflector is a free curved surface calculated according to the special algorithm. The novel LED illuminating optical lens is simple in structure and reasonable in design, large-range even illumination is realized, the utilization field of LEDs is widened, the utilization efficiency of the LEDs is increased, and the novel LED illuminating optical lens is fine in effect and convenient for popularization and utilization.

Description

A kind of New LED light optics lens

Technical field

The utility model belongs to the LED lighting technical field, especially relates to a kind of New LED light optics lens.

Background technology

Since size and energy-conservation aspect advantage, increasing illuminator uses light emitting diode (LED) as light source, but how to realize that wherein the even illumination of target face and making full use of of luminous energy are urgent problems in the LED illumination system layout.LED-based secondary optics element, the key technology that addresses this problem just plays crucial effects to the performance of final illuminating device and product.The light distribution characteristic of led light source can be effectively modulated in design at the secondary optics of LED, makes its optical field distribution satisfy lighting demand on a large scale.In actual illumination, all require even illumination such as projection lamp, reading lamp, venue illuminating lamp, indoor illumination, therefore, LED is outside to be installed specific secondary optics camera lens and could satisfy the actual illumination demand by giving, and make the LED energy-conserving and environment-protective, advantage such as durable finds full expression flexibly.

The utility model content

Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of New LED light optics lens are provided, it is simple in structure, reasonable in design, realized on a large scale evenly illumination, the utilization ratio of LED has been improved in the field that utilizes of having widened LED, result of use is good, is convenient to promote the use of.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of New LED light optics lens, it is characterized in that: comprise the refractor of refracted portion and the reflector of reflecting part, described refractor and reflector are connected as a single entity, going to the bottom of described refractor is an indent hemisphere face opening, the upper surface of described refractor is made up of head portion and the latter half, described head portion is the free form surface of trying to achieve according to special algorithm, the border circle of described head portion is 45 ° with the angle of described optical lens central shaft, two sides of described the latter half are two cambered surfaces concentric with indent hemisphere face opening, and the end face of described the latter half is a plane; Go to the bottom bore and the refractor of the described reflector coincident of going to the bottom, the cup upper end open radius of described reflector equates with cup height, the free form surface of the inwall of described reflector for being tried to achieve by special algorithm.

Above-mentioned a kind of New LED light optics lens, the bore of described indent hemisphere face opening equates with the bore of going to the bottom of reflector and is connected as a single entity.

Above-mentioned a kind of New LED light optics lens, the making material of described refractor is glass or plastics; Described glass is optical glass.

Above-mentioned a kind of New LED light optics lens, the making material of described reflector is glass or plastics, the inwall of described reflector is coated with highly reflective material; Described glass is optical glass.

The utility model compared with prior art has the following advantages: the utility model is at the requirement of the characteristics of led light source and actual illumination and propose, designed necessary secondary optics element, LED luminous energy is modulated again, refractor and reflector respectively LED is sent with the primary optical axis angle be that luminous energy in 0～45 ° and 45 °～90 ° scopes is modulated, realize evenly illumination on a large scale on the target face, make LED can be used for occasions such as venue illumination, room lighting, further widened utilizing the field, having improved the utilization ratio of LED of LED.

Below by drawings and Examples, the technical solution of the utility model is described in further detail.

Description of drawings

Fig. 1 is a stereogram of the present utility model.

Fig. 2 is a sectional structure schematic diagram of the present utility model.

Fig. 3 is the schematic diagram that the utility model free form surface and target face network are divided thought.

Fig. 4 is the one-to-one relationship figure of each point on free form surface bus and the target face radial direction under the two-dimensional coordinate.

Fig. 5 determines the schematic diagram of each point coordinates of free form surface bus for the tangent line iterative method.Description of reference numerals:

The 1-refractor; The 1-1-head portion; 1-2-the latter half;

The 2-reflector; The 3-light source; 4-illumination target face;

5-incident light vector; 6-emergent light vector; 7-method vector;

8-free form surface bus.

The specific embodiment

As depicted in figs. 1 and 2, the utility model comprises the refractor 1 of refracted portion and the reflector 2 of reflecting part, described refractor 1 is connected as a single entity with reflector 2, refractor and reflector respectively LED is sent with the primary optical axis angle be that luminous energy in 0～45 ° and 45 °～90 ° scopes is modulated, realize evenly illumination on a large scale on the target face; Going to the bottom of described refractor 1 is an indent hemisphere face opening, LED is positioned at the hemisphere centre of sphere place during use, the upper surface of described refractor 1 is made up of head portion 1-1 and the latter half 1-2, described head portion 1-1 is the free form surface of trying to achieve according to special algorithm, the border circle of described head portion 1-1 is 45 ° with the angle of described optical lens central shaft, this face make in the LED emergent light with 45 ° of scopes of primary optical axis angle in the light redistribution, realize the even illumination of central area; Two sides of described the latter half 1-2 are two cambered surfaces concentric with indent hemisphere face opening, and the end face of described the latter half 1-2 is a plane, and the LED emergent light through this face deviation does not take place; Go to the bottom bore and the refractor 1 of described reflector 2 coincident of going to the bottom, the cup upper end open radius of described reflector 2 equates with cup height, through the reflection of reflector 2 inwalls, the inwall of described reflector 2 is the free form surface of being tried to achieve by special algorithm by light in 45 °～90 ° scopes of LED outgoing in assurance.

As depicted in figs. 1 and 2, in the present embodiment, the bore of described indent hemisphere face opening equates with the bore of going to the bottom of reflector 2 and is connected as a single entity.The making material of described refractor 1 is glass, plastics or optical glass.The making material of described reflector 2 is glass, plastics or optical glass, and the inwall of described reflector 2 is coated with highly reflective material.

As shown in Figure 3, the free form surface resolution principle of the free form surface of the upper surface head portion of the utility model refractor 1 and reflector 2 inwalls is: down approximate at spot light 3, if free form surface is carried out latticed division, each grid node place has only an incident ray so.Again according to nonimaging optics rim ray principle, by that part of light at each grid edge on the free form surface, through after the system, will be corresponding to the edge of an infinitesimal face on the target, by the light of continuous part in the middle of the grid, through after the system, also in the middle continuous distributed of target infinitesimal.By the divergence conservation of light source (

Conservation) principle is known, if optical system does not have loss, the divergence of the light source 3 of optical system and target is a conservation so.Consider from energy point of view, can project fully on the corresponding infinitesimal face of target face after promptly the interior energy of each grid and solid angle that light source becomes passes through system on the free form surface.According to above-mentioned principle, illuminator for given illumination requirement, target face and free form surface can be divided into the grid that number equates, make on the target face little node form corresponding one by one with the grid node of free form surface, so according to the Snell law, by the method vector of control free form surface grid node, control the exit direction of each grid node place incident ray, just can realize accurately that the energy in each grid projects on corresponding little.When little self-energy of each target equates, promptly realized even illumination.

At the illumination target face is rotational symmetric even lighting problem, only needs to find the solution under two-dimensional coordinate corresponding free form surface bus during design, and it along 360 ° of rotation symmetries of optical axis direction, can be obtained corresponding free form surface.

For avoiding wide-angle emergent ray generation total reflection, special to the LED emergent light be divided into the primary optical axis angle be 0～45 ° and 45 °～90 ° two parts, the former by refractor 1 modulation, is modulated by reflector 2 latter.The resolution principle of both free form surfaces as mentioned above, difference is the Snell equation that the former adopts the refraction form, two latter then adopt the Snell equation of reflected version.

Particularly, under the two-dimensional case, find the solution 8 time-divisions of free form surface bus, three steps:

Step 1, the energy that LED is shone half space is divided equally.Spot light 3 is down approximate, and LED constitutes a hemisphere face to the half space end points that emits beam in the space, the light on the hemisphere face unique corresponding on the lens surface free form surface a bit.This moment, the gross energy Ф of radiation of light source was:

$\mathrm{\Φ}=\underset{0}{\overset{2\mathrm{\π}}{\∫}}\mathrm{d\θ}\underset{0}{\overset{\mathrm{\π}/2}{\∫}}I\cos \mathrm{\φ}\sin \mathrm{\φd\φ}=\mathrm{\πI}{\sin }^2\frac{\mathrm{\π}}{2}=\mathrm{\πI}---\left(1\right)$

I is a light intensity on the primary optical axis, and φ is the angle of light and LED primary optical axis.θ is that I (φ) direction light is at the XY plane inner projection of spherical coordinates and the angle of X-axis.

Divide thought according to grid shown in Figure 3, for obtaining the uniform illuminated area of illumination, need the energy Ф that light source 3 is projected on the free form surface to carry out five equilibrium, because designed free form surface is a rotational symmetry structure, therefore can carry out the equipartition of energy along the φ direction, suppose that counting of five equilibrium is N+1, then contained energy can be expressed as in each endless belt:

${\mathrm{\Φ}}_i=\underset{0}{\overset{2\mathrm{\π}}{\∫}}\mathrm{d\θ}\underset{{\mathrm{\φ}}_i}{\overset{{\mathrm{\φ}}_{i+1}}{\∫}}I\cos {\mathrm{\φ}}_i\sin {\mathrm{\φ}}_i\mathrm{d\φ}=\frac{\mathrm{\Φ}}{N}---\left(2\right)$

When

The time, release by following formula:

${\mathrm{\φ}}_i=\arcsin \sqrt{i/N}$ (i＝0，1，2L?N)(3)

The N+1 that is got on the free form surface bus 8 led light source of naming a person for a particular job is divided into N energy band that equates to the light energy that half space sends along the φ direction.

Step 2 is carried out area to the illumination target face and is divided equally, and according to the rotational symmetric characteristic of target face, target face is divided into N the endless belt that area equates, only needs its radius R is carried out the N equal portions.Under the two-dimensional coordinate, by plane geometry knowledge, the radius R of j the point that target face is radially divided _jCan be expressed as:

$R_j=R\·\sqrt{j/N}---\left(4\right)$

The one-to-one relationship of each point as shown in Figure 4 on free form surface bus and the target face radial direction.

Step 3, as shown in Figure 5, according to the energy equipartition principle, free form surface bus 8 is divided into a discrete point by incident ray, for avoiding wide-angle emergent light generation total reflection to make the luminous energy loss, special to the LED emergent light be divided into the primary optical axis angle be 0～45 ° and 45 °～90 ° two parts, the former is modulated by the free form surface of realizing refraction, the latter is modulated by the free form surface of realizing reflection, promptly to the individual energy band that equates along the φ direction of the N of five equilibrium, preceding 1～N/2 the corresponding refraction form of some place incident ray, the corresponding reflected version of the incident ray at back N/2～N point place.If certain some place method vector is

This some place incident light unit vector is The emergent light unit vector is

Relation below then satisfying according to vector form Snell equation three:

Wherein n is the refractive index of the free-form surface lens material of asking.Be reflected into the refraction special circumstances, get n=1 and get final product.Know that by this equation the method vector at each node place is unique definite by the incident light vector 5 and the emergent light vector 6 of this point.

In Fig. 5, N/2 the discrete point and the Z axle clamp angle of establishing that free form surface bus 8 is divided out are respectively φ _i(i=0,1,2...N), any point coordinate (ρ then _iSin φ _i, ρ _iCos φ _i) promptly represent this some place incident light vector

If this is corresponding to a bit (x on the target face _i, z ₀), emergent light vector then

Be (x _i-ρ _iSin φ _i, z ₀-ρ _iCos φ _i).By each point place incident light vector With the emergent light vector

Representation know, as the radical length ρ of each point place _iAfter determining, each point coordinates and this incident and emergent light vector are promptly definite fully, and then this method vector is determined.Determine each node radical length ρ below by the tangent line iterative method _i

Initially choose node S on the free form surface bus 8 ₀, its coordinate determines that incident light vector 5 is

By its node T in the target face correspondence ₀Can determine the outgoing light vector With above two vector unitsization, can try to achieve this some place method vector by formula (5) Determine this tangential equation simultaneously.When interstitial content was abundant, the incident ray at the some place adjacent with this point must intersect with this tangent line.If this intersection point is S ₁, its incident light vector

Also promptly determine the emergent light vector

By a S ₁With target face respective point T ₁Coordinate determine method vector that in like manner can this adjacent node place

And then definite this tangential equation.Press above method along φ _iDirection iteration is always gone down, and can try to achieve the coordinate (ρ of N/2 point on the bus _iSin φ _i, ρ _iCos φ _i).So far, the free form surface bus of the refraction form of asking is promptly determined, it can be obtained the free form surface of refractor 1 outer surface correspondence around 360 ° of rotation of axle.

To the back N/2～N point of reflected version correspondence, similar with above-mentioned alternative manner, when difference is calculating n in the formula (5) is got 1 and get final product.The free form surface bus of asking refraction form can be obtained the free form surface of reflector 2 inwall correspondences around 360 ° of rotations of axle.

The utility model is at the requirement of the characteristics of led light source and actual illumination and propose, designed necessary secondary optics element, LED luminous energy is modulated again, made LED can be used for occasions such as venue illumination, room lighting, further widened utilizing the field, having improved the utilization ratio of LED of LED.

The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; everyly any simple modification that above embodiment did, change and equivalent structure are changed, all still belong in the protection domain of technical solutions of the utility model according to the utility model technical spirit.

Claims (5)

1. New LED light optics lens, it is characterized in that: comprise the refractor (1) of refracted portion and the reflector (2) of reflecting part, described refractor (1) is connected as a single entity with reflector (2), going to the bottom of described refractor (1) is an indent hemisphere face opening, the upper surface of described refractor (1) is made up of head portion (1-1) and the latter half (1-2), described head portion (1-1) is the free form surface of trying to achieve according to special algorithm, the border circle of described head portion (1-1) is 45 ° with the angle of described optical lens central shaft, two sides of described the latter half (1-2) are two cambered surfaces concentric with indent hemisphere face opening, and the end face of described the latter half (1-2) is a plane; Go to the bottom bore and the refractor (1) of described reflector (2) coincident of going to the bottom, the cup upper end open radius of described reflector (2) equates with cup height, the free form surface of the inwall of described reflector (2) for being tried to achieve by special algorithm.

2. according to the described a kind of New LED light optics lens of claim 1, it is characterized in that: the bore of described indent hemisphere face opening equates with the bore of going to the bottom of reflector (2) and is connected as a single entity.

3. according to the described a kind of New LED light optics lens of claim 1, it is characterized in that: the making material of described refractor (1) is glass or plastics.

4. according to the described a kind of New LED light optics lens of claim 1, it is characterized in that: the making material of described reflector (2) is glass or plastics, and the inwall of described reflector (2) is coated with highly reflective material.

5. according to claim 3 or 4 described a kind of New LED light optics lens, it is characterized in that: described glass is optical glass.

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