CN103809227A - Thin Fresnel lens with a short focal length - Google Patents
Thin Fresnel lens with a short focal length Download PDFInfo
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- CN103809227A CN103809227A CN201210437456.5A CN201210437456A CN103809227A CN 103809227 A CN103809227 A CN 103809227A CN 201210437456 A CN201210437456 A CN 201210437456A CN 103809227 A CN103809227 A CN 103809227A
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Abstract
The invention discloses a thin Fresnel lens with a short focal length. The thin Fresnel lens comprises a reference plane and a light-condensing plane, wherein the light-condensing plane is provided with a light-condensing projection formed by an inclined surface and a vertical surface. The light-condensing projection comprises a reflection projection performing reflection on the inclined surface. The light-condensing plane of the Fresnel lens is provided with the reflection projection such that when light perpendicular to the reference plane is irradiated to the inclined surface of the reflection projection, total reflection occurs on the inclined surface of the reflection projection. And then, light is focused at the focal point of the lens through refraction, thereby effectively shortening the focus length of the lens.
Description
Technical field
The invention belongs to optical instrument field, relate to specifically the slim Fresnel Lenses of a kind of short focal length.
Background technology
Fresnel Lenses is widely used in concentration photovoltaic system, in order to improve optical efficiency, requires Fresnel Lenses to want daylighting area large.Therefore, need to provide a kind of large scale Fresnel Lenses.Light is reflected and is converged to Fresnel Lenses focus by Fresnel Lenses, and in focal length one timing, larger apart from the external tooth face tilt angle that lens center is far away, reflection loss also increases thereupon.For reducing reflection loss, when increasing Fresnel Lenses size, also need to increase focal length, but this can make Photospot solar entire system size become large, and increase control difficulty, thereby increase system cost.Adopt the Fresnel Lenses of the anaclasis principle design of conventional geometric optics, its burnt footpath is controlled between 0.8～1.4 conventionally than (ratio of focal length of lens F and collector lens diagonal line), in lens sizes one timing, if burnt footpath ratio too conference makes focal length elongated, thereby increase system dimension and cost, if burnt footpath is than too little, although can obtain shorter focal length, but can increase reflection loss, thereby reduce the photoelectric transformation efficiency of solar cell.The Fresnel Lenses of the short focal length of design high optical efficiency large scale is to improving concentration photovoltaic system efficiency and reducing costs significant.
Summary of the invention
The technical matters that the present invention solves is to provide the slim Fresnel Lenses of a kind of short focal length, and it,, in the large-sized situation of assurance Fresnel Lenses, can obtain short focal length, thereby reduce the overall dimensions of lens combination, improves light energy conversion efficiency.
In order to solve the problems of the technologies described above, the invention provides the slim Fresnel Lenses of a kind of short focal length, comprise base plane and caustic surface, caustic surface is provided with optically focused projection, this optically focused projection is made up of dip plane and vertical plane, and described optically focused projection is included in the reflection protrusion that reflection occurs on dip plane;
Compared to the prior art, in this programme, on Fresnel Lenses caustic surface, reflection protrusion is set, in the time that the vertical base plane of light is irradiated on the dip plane of reflection protrusion, on the dip plane of reflection protrusion, there is total reflection, then converge in lens focus place by refraction, effectively shortened the focal length of lens.
On the dip plane of described reflection protrusion, scribble reflective membrane; Reflective membrane reflecting effect is better, less demanding to the gradient of dip plane, can meet multiple demand.
Angle between dip plane and the base plane of described reflection protrusion is greater than the cirtical angle of total reflection of dip plane; Energy loss is reduced by total reflection in dip plane, improves light energy conversion efficiency.
Described optically focused projection also comprises refraction projection, and this refraction projection is positioned at the inner side of reflection protrusion; This refraction projection realizes incident light and complete unirefringence on the protruding dip plane of refraction, thereby realizes optically focused.
On described caustic surface, be also provided with plano-convex lens projection, it is arranged in the center of caustic surface; Center arrangement plano-convex lens projection at caustic surface can be optimized spotlight effect.
Described reflection protrusion and refraction projection are around plano-convex lens projection arrangements, this structure can make Q-RING around, annulus around or other shapes around, rationally distributed, and the curvature of the convex shape of dip plane, the inclined degree that reflects protruding dip plane and the plano-convex lens projection of reflection protrusion on caustic surface will can make light converge to focus 6 positions just.
Described reflection protrusion and refraction projection are circular around plano-convex lens projection, and circular effect is best.
Described plano-convex lens projection root area is 1/6～1/4 of caustic surface area; The root diameter (RD) of plano-convex lens projection should be tried one's best greatly, can further improve optical efficiency.
The height of described plano-convex lens projection is less than the height of optically focused projection; Can guarantee, in situation that lens overall dimensions is larger, still to there is good optical efficiency.
This lens entirety is square or circular, and is made by glass, plastics or silica gel material; In actual applications, the instrument of mounted lens has different demands to lens monnolithic case, for this situation, preferably lens monnolithic case is arranged to squarely or circular, and described material can be cost-saving, is easy to processing.
Accompanying drawing explanation
Fig. 1 is the planar structure schematic diagram of the embodiment of the present invention.
Fig. 2 is partial cross section's structural representation of the embodiment of the present invention.
In accompanying drawing, 1. reflection protrusion; 11. dip plane; 12. vertical planes; 2. refraction projection; 3. plano-convex lens projection; 4. base plane; 5. caustic surface; 6. focus.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Embodiment 1:
Fig. 1 illustrates plane arrangement structure of the present invention, lens monnolithic case is square, centre arranges plano-convex lens projection 3, plano-convex lens projection 3 peripheral annular arrange refraction projection 2, the peripheral annular of refraction projection 2 arranges reflection protrusion 1, wherein can determine according to actual needs about the number of rings of refraction projection 2 and reflection protrusion 1.The present invention, in order to realize short focal length, in the present embodiment, adopts the structure of reflection protrusion in the periphery of lens.By reference to the accompanying drawings 2, the lens arrangement that is provided with reflection protrusion 1 is further illustrated.Fig. 2 is the sectional view of lens arrangement, and the first half is only shown.Wherein, comprise the base plane 4 and the caustic surface 5 that are parallel to each other, optically focused projection and plano-convex lens projection 3 are set on caustic surface 5, optically focused projection comprises reflection protrusion 1 and refraction projection 2, reflection protrusion 1 and refraction projection 2 are equipped with dip plane and vertical plane, and dip plane is for focusing on incident light.Angle between dip plane 11 and the base plane 4 of reflection protrusion 1 is greater than the cirtical angle of total reflection of dip plane 11.In fact, namely vertical sand shooting penetrates to the incident light of base plane 4 directions the cirtical angle of total reflection that incident angle on dip plane 11 is greater than dip plane 11.Like this, incident ray forms total reflection on the dip plane 11 of reflection protrusion 1, thereby incident light is reflexed on vertical plane 12 completely, again reflects and converges to focus 6 through vertical plane 12, realizes the object that shortens focal length, and improves optical efficiency.In order to optimize lens integral arrangement, improve efficiency, the dip plane of the refraction projection 2 that reflection protrusion 1 inner side arranges is to complete focusing through unirefringence, the angle of its dip plane and base plane 4 is less than the cirtical angle of total reflection of this dip plane.In order further to improve the optical property of lens, the root area of the plano-convex lens projection 3 arranging on the central optical axis of caustic surface 5 should be tried one's best greatly, preferably reach 1/6 of caustic surface 2 entire area, even 1/4, can effectively improve like this optical efficiency of lens.The curvature of the inclined degree of the dip plane 11 of the reflection protrusion 1 on caustic surface 5, the dip plane of refraction projection 2 and plano-convex lens projection 3 convex shapes will can make light converge to focus 6 positions just.The height of plano-convex lens projection 3 had better not, higher than the height of optically focused projection, if the height of plano-convex lens projection 3 is too high, can affect overall spotlight effect, increases the cost of manufacture of lens etc.The material of lens can preferred glass, plastics or silica gel, and spotlight effect can meet the demands, and cost is not high, is easy to processing.
Embodiment 2:
The present embodiment is compared with embodiment 1, its difference is: on the dip plane 11 of reflection protrusion 1, reflective membrane is set, light is radiated on the reflective membrane of dip plane 11 and reflects, this structure is less demanding to the slope of dip plane, still spotlight effect can be played even if incident angle is less than the cirtical angle of total reflection, focal length can be shortened.
Embodiment 3:
The present embodiment is compared with embodiment 1, and its difference is: lens monnolithic case is for circular.
Claims (10)
1. the slim Fresnel Lenses of short focal length, comprises base plane and caustic surface, and caustic surface is provided with optically focused projection, and this optically focused projection is made up of dip plane and vertical plane, it is characterized in that: described optically focused projection is included in the reflection protrusion that reflection occurs on dip plane.
2. the slim Fresnel Lenses of short focal length according to claim 1, is characterized in that: on the dip plane of described reflection protrusion, scribble reflective membrane.
3. the slim Fresnel Lenses of short focal length according to claim 1, is characterized in that: the angle between dip plane and the base plane of described reflection protrusion is greater than the cirtical angle of total reflection of dip plane.
4. according to the slim Fresnel Lenses of short focal length described in claim 1,2 or 3, it is characterized in that: described optically focused projection also comprises refraction projection, and this refraction projection is positioned at the inner side of reflection protrusion.
5. according to the slim Fresnel Lenses of short focal length described in claim 1,2 or 3, it is characterized in that: on described caustic surface, be also provided with plano-convex lens projection, it is arranged in the center of caustic surface.
6. according to the slim Fresnel Lenses of short focal length described in claim 1,2 or 3, it is characterized in that: described reflection protrusion and refraction projection are around plano-convex lens projection arrangements.
7. the slim Fresnel Lenses of short focal length according to claim 6, is characterized in that: described reflection protrusion and refraction projection are circular around plano-convex lens projection.
8. the slim Fresnel Lenses of short focal length according to claim 5, is characterized in that: described plano-convex lens projection root area is 1/6～1/4 of caustic surface area.
9. the slim Fresnel Lenses of short focal length according to claim 5, is characterized in that: the height of described plano-convex lens projection is less than the height of optically focused projection.
10. according to the slim Fresnel Lenses of short focal length described in claim 1,2 or 3, it is characterized in that: this lens entirety is square or circular, and is made by glass, plastics or silica gel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210437456.5A CN103809227A (en) | 2012-11-06 | 2012-11-06 | Thin Fresnel lens with a short focal length |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210437456.5A CN103809227A (en) | 2012-11-06 | 2012-11-06 | Thin Fresnel lens with a short focal length |
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| Publication Number | Publication Date |
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| CN103809227A true CN103809227A (en) | 2014-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210437456.5A Pending CN103809227A (en) | 2012-11-06 | 2012-11-06 | Thin Fresnel lens with a short focal length |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016138642A1 (en) * | 2015-03-04 | 2016-09-09 | 博立多媒体控股有限公司 | Surface solar system |
| CN107490816A (en) * | 2017-08-04 | 2017-12-19 | 广州市焦汇光电科技有限公司 | Fully-reflected type Fresnel Lenses |
| CN113701065A (en) * | 2021-08-26 | 2021-11-26 | 屏丽科技成都有限责任公司 | Combined light source collector and design method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11504124A (en) * | 1995-04-07 | 1999-04-06 | ティーアイアール・テクノロジーズ・インコーポレーテッド | Collimating TIR lens device using fluorescent light source |
| JP2002221605A (en) * | 2001-01-26 | 2002-08-09 | Sharp Corp | Fresnel lens, illumination device and display device which use the same, method for designing fresnel lens and designing device therefor |
| CN1576898A (en) * | 2003-07-29 | 2005-02-09 | 株式会社西铁城电子 | Fresnel lens and an illuminating device provided with the fresnel lens |
| CN201060308Y (en) * | 2007-07-02 | 2008-05-14 | 李正云 | Reflection type Fresnel plane optical collector |
| CN101995592A (en) * | 2009-08-11 | 2011-03-30 | 财团法人工业技术研究院 | Total reflection optical device |
| CN102122060A (en) * | 2010-01-07 | 2011-07-13 | 颖台科技股份有限公司 | Composite light condensation device |
| CN202929224U (en) * | 2012-11-06 | 2013-05-08 | 青岛哈工大科创工业技术研究院 | Thin type Fresnel Lens with short focal length |
-
2012
- 2012-11-06 CN CN201210437456.5A patent/CN103809227A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11504124A (en) * | 1995-04-07 | 1999-04-06 | ティーアイアール・テクノロジーズ・インコーポレーテッド | Collimating TIR lens device using fluorescent light source |
| JP2002221605A (en) * | 2001-01-26 | 2002-08-09 | Sharp Corp | Fresnel lens, illumination device and display device which use the same, method for designing fresnel lens and designing device therefor |
| CN1576898A (en) * | 2003-07-29 | 2005-02-09 | 株式会社西铁城电子 | Fresnel lens and an illuminating device provided with the fresnel lens |
| CN201060308Y (en) * | 2007-07-02 | 2008-05-14 | 李正云 | Reflection type Fresnel plane optical collector |
| CN101995592A (en) * | 2009-08-11 | 2011-03-30 | 财团法人工业技术研究院 | Total reflection optical device |
| CN102122060A (en) * | 2010-01-07 | 2011-07-13 | 颖台科技股份有限公司 | Composite light condensation device |
| CN202929224U (en) * | 2012-11-06 | 2013-05-08 | 青岛哈工大科创工业技术研究院 | Thin type Fresnel Lens with short focal length |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016138642A1 (en) * | 2015-03-04 | 2016-09-09 | 博立多媒体控股有限公司 | Surface solar system |
| CN107490816A (en) * | 2017-08-04 | 2017-12-19 | 广州市焦汇光电科技有限公司 | Fully-reflected type Fresnel Lenses |
| CN113701065A (en) * | 2021-08-26 | 2021-11-26 | 屏丽科技成都有限责任公司 | Combined light source collector and design method thereof |
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