CN102928991B - Light beam collimator - Google Patents
Light beam collimator Download PDFInfo
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- CN102928991B CN102928991B CN201210433344.2A CN201210433344A CN102928991B CN 102928991 B CN102928991 B CN 102928991B CN 201210433344 A CN201210433344 A CN 201210433344A CN 102928991 B CN102928991 B CN 102928991B
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- 239000002184 metal Substances 0.000 claims abstract description 6
- 239000013307 optical fiber Substances 0.000 abstract description 9
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- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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Abstract
The invention discloses a novel light beam collimator for collimating non-collimated light beams. The collimator is a circular table formed by transparent media, namely, formed by a cone by removing a small cone at the top. The light beams enter from a small circle and are output from a large circle. The upper and lower surfaces of the circular table are smooth, effective input and output are achieved, and the lateral side of the circular table is a smooth surface or coated with a high reflection metal film to achieve effective reflection for lights entering from the inside of the circular table to the lateral side of the circular table. The collimator can shape light beams with large divergence angles into light beams with small divergence angles and can be applied to sunlight collecting systems, laser beam collimation and the like; and therefore the collecting capacity of a follow-up condenser to the lights is effectively improved, and the problem that common condensers cannot effectively converge the lights into optical fibers for transmission due to large divergence angles of condensed lights is solved.
Description
Technical field
The present invention relates to the fields such as solar energy development, laser application, LED illumination, particularly sunlight optical fibre illuminator.
Background technology
In the systems such as solar collector, need the focusing system such as scioptics or catoptron that light is assembled, thereby be input in the transmission medium that optical fiber iso-cross-section is less.At present, general optical collector is made up of multiple arrays, to realize efficient sunlight collecting.As patent of invention " sunlight optical fibre illuminator (CN01113529) " adopts the high sensor being made up of collector lens and four-quadrant photovoltaic detector, realize stable, reliable sunshine tracking.And in the time adopting lens or catoptron to assemble the parallel of sunshine or wide aperture or quasi-parallel light beam, although structure is more simple, caustic surface can be larger, if but focal beam spot more at a distance produce, whole system size can be very large, affects its actual use.If will closely produce focal beam spot, very large at the angle of focal position light beam and lens axis, and the optically focused angle of optical fiber is little, this just causes having part light cannot be coupled in optical fiber., need to take effective measures, to reduce the angle of divergence of focused beam for this reason.
Summary of the invention
For above deficiency, the present invention proposes a kind of novel beam collimation device, to realize, the light beam after line focus is collimated, and reduces the angle of divergence of light beam, is beneficial to the coupling of light beam or further light beam is focused on, to reduce spot size.。This collimating apparatus is a transparent round platform, is generally made up of glass or polymeric material.Round platform outside surface is smooth surface, and its outside can add one deck and have the thin metal layer of high reflective characteristic.
The beam collimation device that the present invention proposes can be the light beam having compared with small divergence angle by the beam shaping larger angle of divergence, can be used for sunlight collection system, laser beam collimation etc.Thereby effectively improve the capacity gauge of follow-up condenser to light, solve the light angle of divergence of common condenser after due to optically focused large and light effectively cannot be converged to the shortcoming of transmitting in optical fiber.
The technical scheme of beam collimation device of the present invention is: this collimating apparatus is a round platform, is formed by the conicle at a circular cone removal top.This collimating apparatus is for carrying out beam collimation to uncollimated rays.Light beam is entered by round platform upper base (1), from round platform go to the bottom (2) output.Round platform upper and lower surface is smooth surface, realizes and effectively inputs, exports, and frustum cone side (3) is for smooth surface or apply high anti-thin metal layer, effectively reflects with the light of realizing incided frustum cone side by round platform inside.
The beam collimation device that the present invention proposes can be the light beam having compared with small divergence angle by the beam shaping larger angle of divergence, can be used for sunlight collection system, laser beam collimation etc.Thereby effectively improve the capacity gauge of follow-up condenser to light, solve the light angle of divergence of common condenser after due to optically focused large and light effectively cannot be converged to the shortcoming of transmitting in optical fiber.
Its ultimate principle is, the light beam with certain angle of divergence enters the upper surface of round platform (roundlet region), reflects, and enters round platform, and the light beam less with round platform axis angle will directly arrive great circle, and output.And the larger light beam of round platform axis angle will arrive the side of round platform, and produce total reflection, because side is circular conical surface, light beam after reflection and round platform axis angle will change.For a specific round platform, angle of divergence light beam within the specific limits effectively can be collimated.
As shown in Figure 1, for cylindrical transparent medium rod, the light that bottom surface enters from it, its incident angle is identical with emergence angle.Therefore, this dielectric rod does not have collimating effect to light beam.
The beam collimation device that the present invention proposes is a round platform, as shown in Figure 2.Be that it is the transparent medium rod being formed by the conicle at a circular cone removal top.Light beam is entered by round platform upper base 1, from round platform 2 outputs of going to the bottom.The upper and lower basal surface of round platform is smooth surface, realizes and effectively inputs, exports, and frustum cone side 3 is for smooth surface or apply high anti-thin metal layer, effectively reflects with the light of realizing incided frustum cone side by round platform inside.And for round platform, when the light in certain angular range is from the incident of round platform upper base, after conical outer surface reflection, then in the time that round platform is gone to the bottom output, its incident angle can reduce.
For convenience of describing, provide to give a definition.
Upper base radius, the radius of round platform upper base border circular areas, uses a
1represent.
The radius of going to the bottom: the go to the bottom radius of border circular areas of round platform, use a
2represent.Here a,
1>a
2.
Round platform axis: the line in the upper base center of circle and the center of circle of going to the bottom.
Frustum cone height: the distance between upper base and the center of circle of going to the bottom, represents with h.
Round platform is trapezoidal: trapezoidal through the surperficial tangent formation of plane and round platform in upper base and the center of circle of going to the bottom.
Round platform waist: refer to the waist that round platform is trapezoidal.
Round platform angle: the base angle that round platform is trapezoidal, represents with θ.
Round platform inclination angle: the angle of round platform waist and round platform axis, represents γ=90 °-θ with γ.
The angle of divergence: the maximum angle between incident ray and round platform axis, represents with α '.
Angle of divergence light: incident angle equals the incident ray of the angle of divergence.
The interior angle of divergence: angle of divergence light enters round platform by round platform upper base, after refraction, the angle of light and round platform axis, represents with α.
Interior output angle: when incident ray arrives under round platform basal surface, the maximum angle of light and round platform axis, represents with β.
Output angle: when incident ray arrives under round platform basal surface, equal the light of β with the angle of round platform axis, in the time that round platform is gone to the bottom refraction output, the angle of output light and round platform axis, represents with β '.
Round platform refractive index: the refractive index of round platform composition material, use n
1represent.Obviously, α > β, α=arcsin (sin (α ')/n
1), β '=arcsin (n
1sin (β)).
Further, interior angle of divergence alpha, interior output angle β, and should meet between round platform tilt angle gamma: γ≤β and α-2 γ≤β.Obviously there is α > β.In better situation, Ying You: interior angle of divergence alpha, interior output angle β, and meet between round platform tilt angle gamma: β=γ, γ=α/3.
Further, require frustum cone height h>=a
1sin (θ) sin (90 °-α)/sin (α-γ).
Further, require frustum cone height h≤1.05a
1sin (θ) sin (90 °-α)/sin (α-γ).
Beneficial effect of the present invention: the beam collimation device that the present invention proposes can be by the light beam larger angle of divergence, collimation is the less light beam of the angle of divergence, and keep its less spot size, be conducive to follow up device and light be incorporated in the transmission systems such as optical fiber or in the application such as Laser Processing.Owing to can reducing the angle of divergence, make can use the device such as lens or catoptron of high focusing power in front end system, reduce system dimension and complexity.
Brief description of the drawings
The transmission schematic diagram of Fig. 1 light in right cylinder;
Fig. 2 frustum cone structure schematic diagram; Wherein, 1 is round platform upper base, and 2 go to the bottom for round platform, and 3 is frustum cone side.
Trapezoidal and the correlation parameter schematic diagram of Fig. 3 round platform.
Embodiment
The collimating apparatus that the present invention proposes is a round platform, is formed by the conicle at a circular cone removal top.This collimating apparatus is for carrying out beam collimation to uncollimated rays.Light beam is entered by round platform upper base 1, from round platform 2 outputs of going to the bottom.Round platform upper and lower surface is smooth surface, realizes and effectively inputs, exports, and frustum cone side 3 is for smooth surface or apply high anti-thin metal layer, effectively reflects with the light of realizing incided frustum cone side by round platform inside.
For realizing the effective collimation to light beam, the selection of round platform tilt angle gamma is relevant with the interior output angle β of interior angle of divergence alpha and requirement.Angle of divergence alpha in, interior output angle β, and should meet between round platform tilt angle gamma: γ≤β and α-2 γ≤β.Reason is: when light is from the incident of round platform upper base, in the time of refraction, if its refraction angle is γ, obviously, now, light can not arrive frustum cone side, go to the bottom but directly arrive round platform, and output.Therefore, interior output angle β can not be less than round platform tilt angle gamma, has γ≤β.On the other hand, if the incident light that refraction angle is ω enters round platform by round platform upper base, and arrive frustum cone side, after reflection, arrive round platform and go to the bottom.Supposing to arrive light while going to the bottom and the angle of round platform axis is ψ.Obviously, ψ=ω-2 γ.In the time of ω=α, light when arrival is gone to the bottom and the angle maximum of round platform axis, be α-2 γ.Therefore, interior output angle meets β >=α-2 γ.To sum up, should there is (alpha-beta)/2≤γ≤β.If in fact there is (alpha-beta)/2 > β, this collimating apparatus cannot realize.For example, if α=45 °, and require β=10 °, there is (alpha-beta)/2=17.5 °, there is (alpha-beta)/2 > β, adopt structure of the present invention to realize.
Obviously, in the time of the γ of γ=α-2, (alpha-beta)/2=γ=β, interior output angle β has minimum value.Therefore, refraction angle of divergence alpha, interior output angle β, and best relation between round platform tilt angle gamma is: γ=α/3, β=γ.
Owing to being greater than the light of round platform tilt angle gamma for refraction angle ω, light need to reflect once through frustum cone side, with reduce that it arrives that round platform goes to the bottom time and the angle ψ of round platform axis.If light is by the edge incident of round platform upper base, the frustum cone height now needing is the highest, and the height h of corresponding round platform should meet h>=dsin (θ), d=a here
1sin (90 °-α)/sin (α-γ) are that the trapezoidal waist of round platform is long.Should there is the height h>=a of round platform
1sin (θ) sin (90 °-α)/sin (α-γ).
On the other hand, frustum cone height h value is larger, and the surface area that round platform is gone to the bottom is also larger.Thereby cause the facula area of output beam to increase.This is unfavorable for the collection to light beam.For this reason, should there is frustum cone height h≤1.05a
1sin (θ) sin (90 °-α)/sin (α-γ).
Embodiment 1
Round platform is made up of pure quartz, and surface is smooth surface, roundlet radius a
1=10mm, round platform tilt angle gamma=13.3 °, frustum cone height h=16.6mm.Can, by the light beam of interior angle of divergence alpha=40 ° (angle of divergence alpha '=68.8 °), collimate the collimated light beam into interior emergence angle β=13.3 ° (output angle β '=19.5 °).Large radius of circle a
2=13.9mm, facula area only increases 93%.
Embodiment 2
Round platform is made up of pure quartz, and side applies through argent thin layer, roundlet radius a
1=15mm, round platform tilt angle gamma=9 °, frustum cone height h=21mm.Can, by the light beam of interior angle of divergence alpha=30 ° (angle of divergence alpha '=46.5 °), collimate the collimated light beam into interior output angle β=12 ° (output angle β '=17.6 °).Large radius of circle a
2=18.3mm, facula area only increases 49%.
Embodiment 3
Round platform is made up of polymeric material, and surface is smooth surface, roundlet radius a
1=20mm, round platform tilt angle gamma=10 °, frustum cone height h=30mm.Can, by the light beam of interior angle of divergence alpha=30 ° (angle of divergence alpha '=48.2 °), collimate the collimated light beam into interior output angle β=10 ° (output angle β '=15 °).Large radius of circle a
2=25.3mm, facula area only increases 60%.
Above-mentioned accompanying drawing is only explanatory view, protection scope of the present invention is not formed to restriction.Should be understood that these embodiment just in order to demonstrate the invention, but not limit the scope of the invention by any way.
Claims (3)
1. a beam collimation device, is characterized in that: this collimating apparatus is the round platform being made up of transparent medium, and light beam is entered by round platform upper base (1), from round platform go to the bottom (2) output; Round platform upper and lower surface is smooth surface, and the upper surface of round platform is roundlet, and the lower surface of round platform is great circle, and frustum cone side (3) is for smooth surface or apply high anti-thin metal layer; And meet: γ≤β and α-2 γ≤β, wherein:
αthe angle of divergence in representing: refer to that angle of divergence light enters round platform by round platform upper base, after refraction, the angle of light and round platform axis,
β represents interior output angle: refer to that incident ray enters round platform by round platform upper base, and while finally arriving under round platform basal surface, the maximum angle of light and round platform axis;
γ represents round platform inclination angle: the angle that refers to round platform waist and round platform axis;
Frustum cone height
hwith upper base radius
a 1with the interior angle of divergence
α, relation between round platform tilt angle gamma meets:
h>=a
1sin (θ) sin (90 °-α)/sin (α-γ); Wherein θ refers to the base angle that round platform is trapezoidal.
2. beam collimation device according to claim 1, is characterized in that: frustum cone height
h≤ 1.05a
1sin (θ) sin (90 °-α)/sin (α-γ).
3. beam collimation device according to claim 1, is characterized in that: interior angle of divergence alpha, and interior output angle β, and meet between round platform tilt angle gamma: β=γ, γ=α/3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210433344.2A CN102928991B (en) | 2012-11-01 | 2012-11-01 | Light beam collimator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210433344.2A CN102928991B (en) | 2012-11-01 | 2012-11-01 | Light beam collimator |
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| Publication Number | Publication Date |
|---|---|
| CN102928991A CN102928991A (en) | 2013-02-13 |
| CN102928991B true CN102928991B (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101201415A (en) * | 2006-12-15 | 2008-06-18 | 鸿富锦精密工业（深圳）有限公司 | Light guide lens and LED containing the same |
| CN201600339U (en) * | 2010-01-20 | 2010-10-06 | 纳优科技（北京）有限公司 | Filtering collimator combined device of X-ray fluorescence spectrometer |
| CN102313244A (en) * | 2011-09-09 | 2012-01-11 | 中国科学院宁波材料技术与工程研究所湖州新能源产业创新中心 | Light emitting diode (LED) lamp optical lens |
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Address after: 211200 Jiangsu Province, Lishui District Yong Yang Town Bridge Road, No. 688 Applicant after: Jiangsu University Address before: 212013 Zhenjiang City, Jiangsu Province University Road, No. 301 Applicant before: Jiangsu University |
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Address after: 212114 Zhenjiang, Zhejiang Province, Dantu high capital street, Xiangshan Road, No. 1 Patentee after: Jiangsu University Address before: 211200 Jiangsu Province, Lishui District Yong Yang Town Bridge Road, No. 688 Patentee before: Jiangsu University |
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Effective date of registration: 20171120 Address after: 212100 Zhenjiang province Jiangsu city Dantu District Shangdang ecological Automobile Industrial Park No. 8 Patentee after: JIANGSU HUIZHI INTELLECTUAL PROPERTY SERVICES CO., LTD. Address before: 212114 Zhenjiang, Zhejiang Province, Dantu high capital street, Xiangshan Road, No. 1 Patentee before: Jiangsu University |
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Effective date of registration: 20191223 Address after: 225200 No. 88 Wenchang East Road, Jiangdu District, Yangzhou, Jiangsu. Patentee after: Yangzhou (Jiangdu) New Energy Automobile Industry Research Institute of Jiangsu University Address before: 212100 Zhenjiang province Jiangsu city Dantu District Shangdang ecological Automobile Industrial Park No. 8 Patentee before: JIANGSU HUIZHI INTELLECTUAL PROPERTY SERVICES CO., LTD. |