CN104020574A - Optical system for collimation of LED light source - Google Patents
Optical system for collimation of LED light source Download PDFInfo
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- CN104020574A CN104020574A CN201410188603.9A CN201410188603A CN104020574A CN 104020574 A CN104020574 A CN 104020574A CN 201410188603 A CN201410188603 A CN 201410188603A CN 104020574 A CN104020574 A CN 104020574A
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- collimation
- led
- optical system
- lens
- collimation lens
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Abstract
The invention provides an optical system for collimation of an LED light source, belonging to the technical field of LED package and application. The system comprises an aspheric reflection surface, a collimating lens and a transparent panel, the whole system is rotationally symmetrical by taking the central axis as the center, all light radiated on the aspheric reflection surface is reflected and then emitted without passing through the collimating lens, all light radiated on the collimating lens is refracted and then emitted, and the transparent panel is connected with the reflection surface at the outer side and the collimating lens in the middle to fix the collimating lens and not change the direction of light radiated on the transparent panel. The LED area source is placed at a position 3mm in front of the collimating lens, so that light emitted from the 1mm*1mm LED light source passes the optical system, and then the maximal semi-field angle of emitted light is 4.400, Fresnel loss and material absorption are not counted, the utilization rate of luminous energy can reach 100%, and a circular illumination area whose center is bright and edge is relatively dark is formed in the far field.
Description
Technical field
The present invention relates to a kind of optical system for LED light source collimation, object is that the light that LED chip is sent is limited in the conglobate light area of outgoing shape in certain angle under there is no the condition of energy loss, belongs to LED package and applied technical field.
Background technology
The high-power LED light source of fast development is because its luminescence efficiency surpasses incandescent lamp, again more mercurous than fluorescent light, plumbous, have environmental protections such as ultraviolet light and stroboscopic, also have that volume is little, the advantage such as long service life, corresponding speed are fast, vibration resistance, be therefore widely used in lighting field.Illuminator for the design of LED light source feature is also maked rapid progress.
But LED sends only disperses, can cause very large energy loss.Due to actual demand, such as searchlight, electric torch, night vision system focusing system even, need to not have under the prerequisite of energy loss, solve the excessive problem in LED divergence of beam angle, LED light source emergent light is become near parallel emergent light.Realize this transformation (also referred to as the collimation of LED light source) and mainly rely on a set of collimating optical system, comprise collimation lens and reflecting curved surface mirror etc.Collimation lens mainly contains symmetroid lens, symmetrical non-spherical lens and free-form surface lens according to its shape, and reflecting curved surface mirror mainly contains free-form surface mirror, non-spherical reflector etc.Utilizing free-form surface lens or free-form surface mirror is present the most general collimation mode as collimating optical system, and designing this collimating mirror conventional method is by the mapping relations between electric light source and lighting target, design problem to be converted to and to separate one group of differential equation.
At present, the alignment problems of ideal point light source has obtained good solution, as given total internal reflection and dioptric system in document < < Freeform lens design for LED collimating illumination > > and < < Freeform surface design for a light-emitting diode – based collimating lens > >.But still there is outgoing angle of half field-of view problems of too for LED light source, for 1 mm * 1 mm LED light source, the given colimated light system of document < < Freeform lens design for LED collimating illumination > >, at angle of half field-of view 5
0the interior efficiency of light energy utilization is 86.5%; The given colimated light system of document < < Freeform surface design for a light-emitting diode – based collimating lens > >, at angle of half field-of view 5
0the interior efficiency of light energy utilization is 81.5%.These systems are all approximately ideal point light source by LED area source and complete, and are then generalized to LED area source, by particular optical software simulation or experiment, obtain its maximum half field angle and efficiency of light energy utilization.But LED light source is not ideal point light source eventually, and its size can not be ignored as ideal point light source, so these methods can not be for the secondary optical design of LED area source.
Field angle is excessive, and some light can be irradiated to outside required field of illumination, and the waste that causes luminous energy is light pollution and glare problem even.Therefore be necessary to design a set of for LED area source collimating optical system, the field angle that makes LED area source send light through colimated light system is as far as possible little, and all emergent raies are all limited in this field angle, and optical energy loss is only because the material absorption of Fresnel loss and manufacture optical system causes.
In sum, the structure of the encapsulating optical system of present stage LED can not meet semiconductor lighting needs, is necessary to design a kind ofly the LED area source emergent light at Vernonia parishii Hook． F． angle to be all compressed in to the optical system within little field angle.
Summary of the invention
The present invention is excessive in order to solve in LED illumination field angle, the efficiency of light energy utilization completes compared with low problem, its objective is a kind of collimating optical system designing for LED area source is provided, can make all light that LED light source sends all be limited in a little field angle.
In order to solve the problems of the technologies described above, the present invention proposes following technical scheme:
A kind of optical system for LED area source collimation, it is characterized in that: comprise that the high order aspheric surface (1) in outside is, middle collimation lens (2), the fixing Plane-parallel Transparent Materiel of collimation lens (3), described optical system is about its central shaft Rotational Symmetry;
The collimation lens part of the illumination of sending from LED light source (4) in the middle of being mapped to neglect rink corner outgoing, is irradiated to outside optical system reflecting surface (1) part after reflection without middle collimation lens (2) and directly outgoing after twice refraction of lens; Fixedly the Plane-parallel Transparent Materiel of collimation lens does not change direction of light.
Preferably, described collimation lens (2) is surrounded by front surface (21), rear surface (22), upper tapered plane (23), lower tapered plane (25), upper horizontal plane (24) and lower horizontal plane (26); Front surface is sphere, is highly 6.58 mm, and rear surface is high order aspheric surface, is highly 11.3 mm, upper horizontal plane and lower horizontal plane width 1.16 mm; The asphericity coefficient of the non-spherical reflector of above-mentioned high order and high order aspheric surface lens should meet the requirement of following formula:
(1)
Wherein:
,
for the coefficient of aspherical equation,
cfor aspheric vertex curvature,
dfor leaving the distance of initial point in aspheric surface summit;
Preferably, the thickness of Plane-parallel Transparent Materiel (3) is less than the upper lower horizontal plane width of collimation lens (2), and thickness is 0.5mm, and material is ACRYLIC;
Preferably, LED chip is placed at the front 3 mm places of described collimation lens (2), and the maximum light-emitting area of chip is 1 mm * 1 mm;
Preferably, the material of the high order aspheric surface in described outside (1) is ACRYLIC, and aspheric surface parameter is:
Preferably, the lens parameters of described collimation lens (2) is:
The material of described collimation lens (2) is ACRYLIC, and refractive index is 1.52054.
The advantage of this optical system is: 1. system architecture is simple, just can make the angle of divergence of emergent light greatly reduce, and improve the efficiency of light energy utilization very significantly by a reflecting surface and lens; 2. material adopts ACRYLIC, is conducive to system processing, assembling and mass production; 3. the light sending from LED light source is divided into two parts, the part that is irradiated to collimation lens after twice refraction of lens to neglect rink corner outgoing, be irradiated to after the part reflection of outside reflecting surface without middle collimation lens and directly outgoing, fixedly the Plane-parallel Transparent Materiel of collimation lens does not change through the direction of light on it.
Accompanying drawing explanation
Fig. 1 is optical system structure schematic diagram of the present invention;
Fig. 2 LED several special intersection point with colimated light system that emits beam;
The light that Fig. 3 LED light source sends is through the light path simulation of collimation lens in the middle of system;
The light path simulation of reflecting surface outside the light process system that Fig. 4 LED light source sends
The light that Fig. 5 LED light source sends is through the light path simulation of whole colimated light system;
Fig. 6 LED after colimated light system
xthe lighting simulation figure at=6 m places;
Fig. 7 exists
xthe Two dimensional Distribution of light intensity on=6 m place perpendicular planes;
Fig. 8 exists
xthe distributed in three dimensions of light intensity on=6 m place perpendicular planes;
Reference numeral is as follows:
In figure: d
lfor the spacing distance of LED light source 4 with collimation lens 2 front surface 21 summits;
D
2collimation lens 2 front surface 21 summits are to the horizontal range of tapered plane 23 left ends;
D
3the horizontal range of the tapered plane left and right end of collimation lens 2
D
4width for the upper lower horizontal plane of collimation lens 2
D
5thickness for Plane-parallel Transparent Materiel;
D
6the distance on collimation lens 2 front and rear surfaces summits;
R1 is the vertex curvature radius of non-spherical reflector;
R21 is collimation lens 2 front surface radius-of-curvature;
R22 is the aspheric surface vertex curvature radius of collimation lens 2 rear surfaces.
Embodiment
According to the optical texture of Fig. 1, designed an optical system, the light that 1 mm * 1 mm LED light source sends maximum half field angle of emergent ray after this optical system is less than 4.40
0if, to disregard Fresnel loss and material and absorb, the efficiency of light energy utilization can reach 100%.
Technical indicator is as shown in table 1, and optical system specific design parameter is as shown in table 2,3,4.
Claims (7)
1. the optical system for LED area source collimation, it is characterized in that: comprise that the high order aspheric surface (1) in outside is, middle collimation lens (2), the fixing Plane-parallel Transparent Materiel of collimation lens (3), described optical system is about its central shaft Rotational Symmetry; The collimation lens part of the illumination of sending from LED light source (4) in the middle of being mapped to after twice refraction of lens to neglect rink corner outgoing, be irradiated to outside optical system reflecting surface (1) part after reflection without middle collimation lens (2) and directly outgoing, fixedly the Plane-parallel Transparent Materiel of collimation lens (3) does not change direction of light.
2. a kind of optical system for LED collimation as claimed in claim 1, is characterized in that: described collimation lens (2) is surrounded by front surface (21), rear surface (22), upper tapered plane (23), lower tapered plane (25), upper horizontal plane (24) and lower horizontal plane (26); Front surface is sphere, is highly 6.58 mm, and rear surface is high order aspheric surface, is highly 11.3 mm, upper horizontal plane and lower horizontal plane width 1.16 mm; The asphericity coefficient of the non-spherical reflector of above-mentioned high order and high order aspheric surface lens should meet the requirement of following formula:
(1)
Wherein:
,
for the coefficient of aspherical equation,
cfor aspheric vertex curvature,
dfor leaving the distance of initial point in aspheric surface summit.
3. a kind of optical system for LED collimation as described in claim 1-2, is characterized in that: the thickness of Plane-parallel Transparent Materiel (3) is less than the upper lower horizontal plane width of collimation lens (2), and thickness is 0.5mm, and material is ACRYLIC.
4. a kind of optical system for LED collimation as described in claim 1-3, is characterized in that: LED chip is placed at the front 3 mm places of described collimation lens (2), and the maximum light-emitting area of chip is 1 mm * 1 mm.
5. a kind of optical system for LED collimation as described in claim 1-4, is characterized in that: the material of the high order aspheric surface in described outside (1) is ACRYLIC, and aspheric surface parameter is
。
6. a kind of optical system for LED collimation as claimed in claim 1, is characterized in that: the lens parameters of described collimation lens (2) is
7. a kind of optical system for LED collimation as claimed in claim 1, is characterized in that: the material of described collimation lens (2) is ACRYLIC, and refractive index is 1.52054.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410188603.9A CN104020574B (en) | 2014-05-07 | 2014-05-07 | A kind of optical system for LED light source collimation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410188603.9A CN104020574B (en) | 2014-05-07 | 2014-05-07 | A kind of optical system for LED light source collimation |
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| CN104020574A true CN104020574A (en) | 2014-09-03 |
| CN104020574B CN104020574B (en) | 2019-04-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146986A (en) * | 2019-01-14 | 2019-08-20 | 深圳珑璟光电技术有限公司 | A kind of augmented reality display optical system |
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- 2014-05-07 CN CN201410188603.9A patent/CN104020574B/en not_active Expired - Fee Related
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| CN110146986A (en) * | 2019-01-14 | 2019-08-20 | 深圳珑璟光电技术有限公司 | A kind of augmented reality display optical system |
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| CN104020574B (en) | 2019-04-12 |
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Granted publication date: 20190412 Termination date: 20200507 |