CN103162234A - Lens for ultraviolet light-emitting diode (LED) collimation - Google Patents
Lens for ultraviolet light-emitting diode (LED) collimation Download PDFInfo
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- CN103162234A CN103162234A CN201210552914XA CN201210552914A CN103162234A CN 103162234 A CN103162234 A CN 103162234A CN 201210552914X A CN201210552914X A CN 201210552914XA CN 201210552914 A CN201210552914 A CN 201210552914A CN 103162234 A CN103162234 A CN 103162234A
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Abstract
The invention discloses a lens for ultraviolet light-emitting diode (LED) collimation. The lens for the ultraviolet LED collimation comprises a first free-form surface and a total-reflection free-form surface, wherein the first free-form surface and the total-reflection free-form surface are rotary bodies and an optical axis serves as the axle center of the rotary bodies, an opening of the total-reflection free-form surface gradually increases along the emitting direction of the optical axis, the first free-form surface is arranged in the interior of the total-reflection free-form surface, the first free-form surface protrudes along the direction of the optical axis, the first free-form surface is used for carrying out refraction on light which is close to an optical axis area and enabling the light to be capable of emitting parallel to the optical axis, and the total-reflection free-form surface is used for carrying out reflection on light which is away from the optical axis area and enabling the light to be capable of emitting parallel to the optical axis. The lens for the ultraviolet LED collimation is high in collimation degree, long in service life, very suitable for the ultraviolet LED collimation and capable of solving the problems that an original LED collimation lens is complex in structure, low in the collimation degree, not suitable for the ultraviolet LED collimation and the like.
Description
Technical field
The present invention relates to semiconductor lighting technology and applied technical field, particularly a kind of can the light that LED light source sends being collimated, and make collimation angle less than the collimation lenses of 2 degree.
Background technology
In recent years, along with the development of semiconductor chip and encapsulation technology, light efficiency and the life-span of ultraviolet LED are improved constantly, and become ultraviolet source of new generation.Traditional ultraviolet mercury lamp in use temperature is higher, and power consumption is huge, and the life-span is shorter, easily causes larger environmental pollution in process of manufacture, although industry be devoted to it is improved always, because the limitation of its original hardware is difficult to break through always.Ultraviolet LED is because having constant intensity of illumination, and outstanding temperature is controlled, and environmental protection and energy saving, the life-span is long, wave band is single pure in advantages such as clutters, and is widely used in every field.
In the uv-exposure field, because being generally lambert's type, the light distribution of ultraviolet LED light source distributes, larger lighting angle is arranged, can not directly use among uv-exposure, and the colimated light system that exists at present collimates mainly for high-voltage ultraviolet mercury lamp, and is not suitable for ultraviolet LED light source.Therefore ultraviolet LED light source is collimated and just become the emphasis of research.Be applied at present the device of ultraviolet LED collimation, the general reflection-type that adopts, need to reflect collimation at the curved surface metal-coated membrane, this kind lens are comparatively desirable for the collimation effect of ideal point light source, but the LED light source for reality, due to luminous comparatively concentrated, be difficult to collimate with this device.
In addition, although ultraviolet LED has a lot of benefits, ultraviolet LED in the past adopts epoxy encapsulation mostly, and this makes obviously reduce its service life, this is because the ultraviolet wire harness easily decomposes the epoxy resin of LED, thereby the life-span of ultraviolet LED was reduced to less than 5,000 hours.The next-generation technology of ultraviolet LED is take " sclerosis " or " defence line " epoxy packages as feature, although the life-span that provides will reach 10,000 hours, but still can not meet most application far away.
Problem and defective for the lens existence that is used at present the ultraviolet LED collimation, this patent has been drawn the peculiar advantage of free-form surface lens, introduce simultaneously the thought of free form surface and total internal reflection, adopt the design of free form surface reflection and refraction associating collimation, the problem that runs into to solve prior art.
Summary of the invention
In view of this, the invention provides a kind of lens for the ultraviolet LED collimation, adopt the design of free form surface reflection and refraction associating collimation, realize that collimation reaches the collimation effect of 2 degree, solved the undesirable problem of existing LED collimation lens collimation effect.In addition, the lens for ultraviolet LED collimation of the present invention use the optical quartz material to be made into integration, and in the service life when therefore greatly having improved it and being used for the ultraviolet LED collimation, have significant progress.
The present invention solves the problems of the technologies described above by following technological means:
Lens for the ultraviolet LED collimation of the present invention, comprise the first free form surface and total reflection free form surface, described the first free form surface and total reflection free form surface are the revolving body take optical axis as the axle center, and the opening of total reflection free form surface increases gradually along the optical axis exit direction; Described the first free form surface is arranged on the inside of bowl-shape total reflection free form surface, and described the first free form surface protrudes along the optical axis exit direction; Described the first free form surface is used for the light near the optical axis zone is reflected, and makes light can be parallel to optical axis and penetrates; Described total reflection free form surface is used for the light away from the optical axis zone is reflected, and makes light can be parallel to optical axis and penetrates.Described near the optical axis zone LED light and be to distinguish with the fan-shaped irradiating angle that the LED spot light on optical axis is injected in lens away from the LED light in optical axis zone.
Further, also comprise the tubular joint face that parallels with optical axis and with the perpendicular annular exit facet of optical axis, one end of described tubular joint face stretches to the inside of total reflection free form surface and is connected with the outward flange of the first free form surface along optical axis, and the other end of described tubular joint face is connected with the inward flange of annular exit facet; The large end opening edge of the outward flange of described annular exit facet and total reflection free form surface is connected.Described joint face parallels with the collimated light that penetrates from the first free form surface, and it mainly plays the effect that connects the first free form surface and exit facet, makes described lens become as a whole.Described exit facet can not produce refraction action to light, makes the collimated ray after the reflection of total reflection free form surface straightly to penetrate.
Further, also comprise the second free form surface along the optical axis direction indent, the outward flange of described the second free form surface is connected with the inward flange of total reflection free form surface.Described the second free form surface is as the LED plane of light incidence, and optical axis passes from the center of the second free form surface.The concave shaped design forming of the second free form surface can hold the space of LED light source, and can form to the light that LED light source sends certain effect of contraction and initial modulation, and gained LED light more is injected in collimation lens in the concentrated area.
Further, described the second free form surface is connected with the total reflection free form surface by transition plane, and described transition plane and optical axis are perpendicular.The inside and outside edge of transition plane coincides with the outward flange of the second free form surface and the inward flange of total reflection free form surface respectively.
Further, described lens are made by the optical grade quartz material.The light transmittance of optical grade quartz is more than 90%, and high temperature resistant.
Further, the Outside Dimensions r of described the first free form surface
1Satisfy following relation: r
1/ h
1=r
2/ h
2, wherein, h
1Be the height of the first free form surface distance from bottom overall lens base plane, r
2Be the Outside Dimensions at total reflection free form surface top, h
2Be its height apart from the overall lens base plane.
Further, vector S nell law is adopted in the calculating of described the first free form surface and total reflection free form surface, and its expression formula is as follows:
In the computational process of the first free form surface, the n value is that the lens material quartz is in the refractive index of ultraviolet band; In the computational process of total reflection free form surface, the n value is-1; In the process of calculating the first free form surface and total reflection free form surface, incident ray is expressed as
Wherein, θ,
Be the angle of incident ray under polar coordinate system, and as collimation lens, its emergent ray is expressed as
Be the normal vector of free form surface at light incidence point place.
Further, the seamed edge place of described lens is provided with fillet chamfering or direct chamfering.
As the alternative of technique scheme, described lens are designed and produced by optical quartz material and reflectorized material split and form.Wherein, described reflectorized material is used for making the total reflection free form surface; Described optical quartz material is used for making the first free form surface and the second free form surface.
The purposes that to the invention also discloses described collimated wavelength be 320～400nm ultraviolet light.Wavelength is that 320～400nm ultraviolet light is the UV-A wave band, and the ultraviolet LED collimation lens of making according to the UV-A wave band is more suitable for for uv-exposure, curing and field of medical technology.
Lens for the ultraviolet LED collimation of the present invention have following beneficial effect:
1, the lens for the ultraviolet LED collimation of the present invention can realize that collimation less than the collimation effect of 2 degree, has reached goal of the invention.
2, by being set, joint face and exit facet make described collimation lens of the present invention can make one, and simple in structure.
3, the lens for the ultraviolet LED collimation of the present invention adopt the optical grade quartz material to make, and make its collimation that is specially adapted to ultraviolet LED, make extend at least ten times the service life of ultraviolet LED, reach 50,000 hours.
4, the curved surface in lens of the present invention calculates and adopts vector S nell law, and by the lens curved surface that law provided by the invention and computational methods obtain, it collimates better effects if.
5, each seamed edge of the lens for ultraviolet LED collimation of the present invention has all carried out fillet chamfering or direct chamfering, makes lens of the present invention be difficult for breaking, and is more durable.
6, the lens for ultraviolet LED collimation of the present invention have solved the problem of short, collimation weak effect in existing ultraviolet LED collimation lens service life, and it is more suitable for for fields such as uv-exposure, curing and medical skills.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the lens basic structure three-dimensional perspective in the embodiment of the present invention one;
Fig. 2 is the collimated principle schematic (in figure, arrow is depicted as the light direction of illumination) in the embodiment of the present invention one;
Fig. 3 is the lens cross sectional representation in the embodiment of the present invention one;
Fig. 4 is the collimated simulated effect figure in the embodiment of the present invention one;
Fig. 5 adopts the lens arrangement schematic diagram of split design in the embodiment of the present invention two.
The specific embodiment
The present invention is described in detail below with reference to drawings and Examples:
Figure 1 shows that the lens three-dimensional structure schematic diagram of employing Integral design of the present invention, its cross-sectional view as shown in Figure 3.In the present embodiment, preferred day inferior NCSU033B ultraviolet LED chip is as light source, and lens material adopts the optical grade quartz material, consider the size of LED chip, the preferred 5mm of the Outside Dimensions of the second free form surface 5 considers the factor of processing, the transition plane 6 preferred 1mm of size.Through after collimated of the present invention, the collimation angle of ultraviolet LED light is less than 2 degree, as shown in Figure 4.In addition, the lens that adopt the optical grade quartz material to make are applied to can greatly extend in the ultraviolet LED collimation service life of ultraviolet LED.
Embodiment one adopts the LED collimation lens of integrated design
Lens shown in the present embodiment comprise the first free form surface 1 and total reflection free form surface 2, and described the first free form surface 1 and total reflection free form surface 2 are the revolving body take optical axis as the axle center, and the opening of total reflection free form surface 2 increases gradually along the optical axis exit direction; Described the first free form surface 1 is arranged on the inside of total reflection free form surface 2, and described the first free form surface 1 is to protrude along the optical axis exit direction.Described the first free form surface 1 is used for the light near the optical axis zone is reflected, and makes light can be parallel to optical axis and penetrates; Described total reflection free form surface 2 is used for the light away from the optical axis zone is reflected, and makes light can be parallel to optical axis and penetrates.
Lens in the present embodiment also comprise the tubular joint face 3 that parallels with optical axis and with the perpendicular annular exit facet 4 of optical axis, one end of described tubular joint face 3 stretches to the inside of bowl-shape total reflection free form surface 2 and is connected with the outward flange of the first free form surface 1 along optical axis, and the other end of described tubular joint face 3 is connected with the inward flange of annular exit facet 4; The large end opening edge of the outward flange of described annular exit facet 4 and total reflection free form surface 2 is connected.Described joint face 3 parallels with the collimated light that penetrates from the first free form surface 1, and it mainly plays the effect that connects the first free form surface 1 and exit facet 4.Described exit facet 4 can not produce refraction action to light, makes the collimated ray after 2 reflections of total reflection free form surface straightly to penetrate.Lens in the present embodiment also comprise the second free form surface 5 as the LED plane of light incidence, described the second free form surface 5 is inner concave, optical axis passes from the center of the second free form surface 5, described the second free form surface 5 is connected with total reflection free form surface phase 2 by transition plane 6, described transition plane 6 is perpendicular with optical axis, and the Outside Dimensions of transition plane equates with the bottom size of total reflection free form surface.The inside and outside edge of transition plane 6 coincides with the outward flange of the second free form surface and the inward flange of total reflection free form surface respectively.The space that the concave shaped design forming of the second free form surface 5 can hold LED light source 7, and can form to the light that LED light source 7 sends certain effect of contraction and initial modulation, gained LED light is gathered to optical axis, makes to penetrate more crypto set of light.
Collimated principle in above-described embodiment one, as shown in Figure 2, in figure, θ is the angle of isolychn and symmetry axis (optical axis), when at first light will shine on the second free form surface 5 after less than the outgoing of θ angle, through shining after the refraction of the second free form surface 5 on the first free form surface 1, be parallel to optical axis and penetrate after the birefringence of the first free form surface 1; When at first light will shine on the second free form surface 5 after greater than the outgoing of θ angle, through shining after the refraction of the second free form surface 5 on total reflection free form surface 2, the total reflection that is reflected into lens inside of this total reflection free form surface 2, being parallel to optical axis after the reflection of light through total reflection free form surface 2 penetrates, be perpendicular to the plane of optical axis due to exit facet 4, so can not change the path of the light after 2 reflections of total reflection free form surface.
As further improvement in the technical proposal, as shown in Figure 3, the Outside Dimensions r of described the first free form surface
1Satisfy following relation:
r
1/h
1＝r
2/h
2，
Wherein, h
1Be the height of the first free form surface distance from bottom overall lens base plane, r
2Be the Outside Dimensions at total reflection free form surface top, h
2Be its height apart from the overall lens base plane.
Vector S nell law is adopted in the calculating of described the first free form surface and total reflection free form surface, and its expression formula is as follows:
In the computational process of the first free form surface, the n value be the lens material quartz in the refractive index of ultraviolet band, in the present embodiment, n preferred 1.458; In the computational process of total reflection free form surface, the n value is-1; In the process of calculating the first free form surface and total reflection free form surface, incident ray is expressed as
Wherein, θ,
Be the angle of incident ray under polar coordinate system, and as collimation lens, its emergent ray is expressed as
Be the normal vector of free form surface at light incidence point place.
By the lens that curved surface algorithm provided by the invention calculates, its collimation effect is better, has realized the collimation effect of collimation less than 2 degree.
Embodiment two adopts the LED collimation lens of split design
Lens described in the present embodiment two are designed and produced by optical quartz material and reflectorized material split and form.As shown in Figure 5, wherein, described reflectorized material is used for making total reflection free form surface 2; Described optical quartz material is used for making the first free form surface 1 and the second free form surface 5.In the split design, lens have saved joint face and exit facet, make the structure of lens simply too much for embodiment one, manufacture the lens that also do not have in embodiment one complicated.In addition, as the alternative of embodiment two, lens component and the LED light source 7 with the first free form surface 1 and the second free form surface 5 in embodiment two can also be carried out integrative packaging.
As embodiment one and two further improvement, the first free form surface of described lens, the second free form surface or total reflection free form surface calculation Design theoretical according to nonimaging optics obtains.Adopt rim ray principle and SMS (multiaspect is method for designing simultaneously) method in the nonimaging optics theory, calculate the primary face type of the non-imaging LED of refraction/fully-reflected type collimation lens free form surface, then utilize optical design software to be optimized design to structure, finally obtain the higher LED collimation lens of collimation.The lens that adopt the theoretical calculation Design of nonimaging optics to obtain, its efficiency of light energy utilization and target face illuminance uniformity all increase.
As further improvement in the technical proposal, the seamed edge place of described lens has carried out fillet chamfering or direct chamfering, makes lens of the present invention be difficult for breaking, and is more durable.As in embodiment one, the fillet that the seamed edge place of lens leaves the 0.2mm left and right breaks to prevent quartz glass.
The purposes that the present invention further comprises and uses described collimated wavelength is 320～400nm ultraviolet light.1) for the purposes of collimation wavelength at 320～365nm ultraviolet light: macromolecule and ink printing; 2) be the purposes of 365nm ultraviolet light for the collimation wavelength: be used for ultra-violet curing; 3) for the purposes of collimation wavelength at 375～395nm ultraviolet light: discrimination; 4) for the purposes of collimation wavelength at 390～410hm ultraviolet light: surperficial degerming/beauty treatment degerming.
LED collimation lens of the present invention has been drawn the peculiar advantage of free-form surface lens, introduce simultaneously the thought of free form surface and total internal reflection, realize the design of free form surface reflection and refraction associating collimation, solved existing collimation lens complicated in process, the undesirable shortcoming of collimation effect realizes that collimation is less than the collimation effect of 2 degree.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. be used for the lens of ultraviolet LED collimation, comprise the first free form surface (1) and total reflection free form surface (2), described the first free form surface (1) and total reflection free form surface (2) are the revolving body take optical axis as the axle center, it is characterized in that, the opening of total reflection free form surface (2) increases gradually along the optical axis exit direction; Described the first free form surface (1) is arranged on the inside of total reflection free form surface (2), and described the first free form surface (1) protrudes along optical axis direction; Described the first free form surface (1) is used for the light near the optical axis zone is reflected, and makes light can be parallel to optical axis and penetrates; Described total reflection free form surface (2) is used for the light away from the optical axis zone is reflected, and makes light can be parallel to optical axis and penetrates.
2. lens for ultraviolet LED collimation according to claim 1, it is characterized in that, also comprise the tubular joint face (3) that parallels with optical axis and with the perpendicular annular exit facet (4) of optical axis, one end of described tubular joint face (3) stretches to the inside of total reflection free form surface (2) and is connected with the outward flange of the first free form surface (1) along optical axis, and the other end of described tubular joint face (3) is connected with the inward flange of annular exit facet (4); The large end opening edge of the outward flange of described annular exit facet (4) and total reflection free form surface (2) is connected.
3. lens for ultraviolet LED collimation according to claim 2, it is characterized in that, also comprise the second free form surface (5) along the optical axis direction indent, the outward flange of described the second free form surface (5) is connected with the inward flange of total reflection free form surface (2).
4. lens for ultraviolet LED collimation according to claim 3, it is characterized in that, described the second free form surface (5) is connected with total reflection free form surface (2) by transition plane (6), described transition plane (6) is perpendicular with optical axis, and the Outside Dimensions of transition plane (6) equates with the bottom size of total reflection free form surface (2).
5. the lens for the ultraviolet LED collimation according to claim 4, is characterized in that, described lens are made by the optical quartz material.
6. the lens for the ultraviolet LED collimation according to claim 5, is characterized in that the Outside Dimensions r of described the first free form surface (1)
1Satisfy following relation:
r
1/h
1＝r
2/h
2
Wherein, h
1Be the height of the first free form surface (1) distance from bottom overall lens base plane, r
2Be the Outside Dimensions at total reflection free form surface (2) top, h
2Be its height apart from the overall lens base plane.
7. the lens for the ultraviolet LED collimation according to claim 6, is characterized in that, vector S nell law is all adopted in the calculating of described the first free form surface (1) and total reflection free form surface (2), and its expression formula is as follows:
In the computational process of the first free form surface (1), the n value is that the lens material quartz is in the refractive index of ultraviolet band; In the computational process of total reflection free form surface (2), the n value is-1; In the process of calculating the first free form surface (1) and total reflection free form surface (2), incident ray is expressed as
Wherein, θ,
Be the angle of incident ray under polar coordinate system, and as collimation lens, its emergent ray is expressed as
Be the normal vector of free form surface at light incidence point place.
8. lens for ultraviolet LED collimation according to claim 7 is characterized in that: the seamed edge place of described lens is provided with fillet chamfering or direct chamfering.
9. according to claim 1-8 described collimated wavelength of any one purposes that is 320～400nm ultraviolet light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210552914.XA CN103162234B (en) | 2012-12-19 | Lens for ultraviolet LED collimation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210552914.XA CN103162234B (en) | 2012-12-19 | Lens for ultraviolet LED collimation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103162234A true CN103162234A (en) | 2013-06-19 |
| CN103162234B CN103162234B (en) | 2016-11-30 |
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Cited By (8)
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| CN103912844A (en) * | 2014-03-31 | 2014-07-09 | 中国人民解放军海军工程大学 | LED uniform-collimation optical system |
| CN104474638A (en) * | 2014-12-17 | 2015-04-01 | 重庆德马光电技术有限公司 | Ultraviolet therapeutic apparatus |
| CN105653810A (en) * | 2016-01-06 | 2016-06-08 | 华南理工大学 | Making method of ultraviolet LED curing optical system |
| CN106444067A (en) * | 2016-08-30 | 2017-02-22 | 京东方科技集团股份有限公司 | Light collimation structure, substrate and manufacturing method, backlight module group and display apparatus |
| CN106945389A (en) * | 2017-03-22 | 2017-07-14 | 深圳市奇普仕科技有限公司 | A kind of ultraviolet LED collimation lens for 3D silk-screens |
| TWI633356B (en) * | 2017-07-12 | 2018-08-21 | 志聖工業股份有限公司 | A light source module of a exposure machine with a total internal reflection lens and a sleeve |
| CN110389457A (en) * | 2018-04-16 | 2019-10-29 | 立碁电子工业股份有限公司 | Project structured light system |
| CN113847578A (en) * | 2021-10-23 | 2021-12-28 | 福建吉星智能科技股份有限公司 | Combined rotating curved lens for beacon light and working method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912844A (en) * | 2014-03-31 | 2014-07-09 | 中国人民解放军海军工程大学 | LED uniform-collimation optical system |
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| CN105653810A (en) * | 2016-01-06 | 2016-06-08 | 华南理工大学 | Making method of ultraviolet LED curing optical system |
| CN105653810B (en) * | 2016-01-06 | 2019-04-09 | 华南理工大学 | The production method that a kind of ultraviolet LED solidifies optical system |
| CN106444067A (en) * | 2016-08-30 | 2017-02-22 | 京东方科技集团股份有限公司 | Light collimation structure, substrate and manufacturing method, backlight module group and display apparatus |
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| CN106945389A (en) * | 2017-03-22 | 2017-07-14 | 深圳市奇普仕科技有限公司 | A kind of ultraviolet LED collimation lens for 3D silk-screens |
| TWI633356B (en) * | 2017-07-12 | 2018-08-21 | 志聖工業股份有限公司 | A light source module of a exposure machine with a total internal reflection lens and a sleeve |
| CN110389457A (en) * | 2018-04-16 | 2019-10-29 | 立碁电子工业股份有限公司 | Project structured light system |
| CN113847578A (en) * | 2021-10-23 | 2021-12-28 | 福建吉星智能科技股份有限公司 | Combined rotating curved lens for beacon light and working method thereof |
| CN113847578B (en) * | 2021-10-23 | 2023-11-14 | 福建吉星智能科技股份有限公司 | Combined rotating curved surface lens for navigation mark lamp and working method thereof |
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