CN102540286B - Fresnel light condensing lens - Google Patents
Fresnel light condensing lens Download PDFInfo
- Publication number
- CN102540286B CN102540286B CN201210029157.8A CN201210029157A CN102540286B CN 102540286 B CN102540286 B CN 102540286B CN 201210029157 A CN201210029157 A CN 201210029157A CN 102540286 B CN102540286 B CN 102540286B
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- light
- incidence
- condensing lens
- lens
- plane
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- 244000309464 bull Species 0.000 claims description 32
- 238000000465 moulding Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 235000012431 wafers Nutrition 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/52—PV systems with concentrators
Abstract
The invention discloses a Fresnel light condensing lens with smaller light loss. The Fresnel light condensing lens comprises an incidence surface and an emergence surface, wherein the incidence surface is a smooth surface, a plurality of sunken tooth grooves are arranged on the emergence surface, each tooth groove comprises a first surface and a second surface, the first surface is used for exerting a light condensing function, the second surface is crossed with the first surface, two ends of the second surface are respectively connected with heads and tails of adjacent two first surfaces through an inner circular corner and an outer circular corner, and the second surface is inclined towards the direction of the incidence surface such that the loss of light passing through the Fresnel light condensing lens is smaller than the loss of light passing through the Fresnel light condensing lens when second surface is vertical to the incidence surface. According to the Fresnel light condensing lens disclosed by the invention, a structure different from the surface tooth grooves of the traditional Fresnel light condensing lens is utilized, thereby reducing the light loss and improving the utilization efficiency of light energy; and in addition, the power generation efficiency can be improved if the Fresnel light condensing lens is applied to the field of light condensing photovoltaic generation.
Description
Technical field
The present invention relates to Fresnel light condensing lens, be specifically related to the surperficial tooth slot structure of lens.
Background technology
Concentrating photovoltaic power generation technology is the effective way of the reduced photovoltaic generation cost of generally acknowledging.A complete light gathering photovoltaic power generating system mainly comprises several parts such as compound eye type photovoltaic concentrator module, sun tracker, power storage or contravariant equipment.Compound eye type photovoltaic concentrator module, as photoelectric conversion part, is mainly made up of compound eye type lens light gathering device and the circuit board that photovoltaic battery wafers is installed.Wherein, compound eye type lens light gathering device comprises the collector lens of polylith planar array, when use, make collector lens substantially just to sunniness direction by sun tracker, then respectively sunshine is converged and projected on the receiving plane of photovoltaic battery wafers corresponding with each collector lens on circuit board by these collector lenses, thereby make generation current in each photovoltaic battery wafers, these electric currents are by the circuit output on circuit board.Publication number is that the disclosed photovoltaic concentrator module of application for a patent for invention file of CN101640502A has representativeness.The point light-focusing Fresnel lens adopting in this battery component has become the best choosing folding of the generally acknowledged collector lens of industry.Still have many disclosing to adopt light-focusing Fresnel lens to make the list of references of the concentrating photovoltaic power generation technology of collector lens, do not repeat them here.
As shown in Fig. 5 a, Fig. 5 b, existing Fresnel light condensing lens comprises the plane of incidence 3 and exit facet 1, the described plane of incidence 3 is plane, and described exit facet 1 is provided with the teeth groove 2 of many depressions, and described teeth groove 2 has comprised the first surface 2a of optically focused effect and the second surface 2b crossing with this first surface.In the time that these teeth groove are designed to concentric ring groove, this collector lens can converge in incident ray a bit upper, becomes a light-focusing Fresnel lens; In the time of straight trough that these teeth groove are designed to be parallel to each other, this collector lens can converge incident ray point-blank, becomes line light-focusing Fresnel lens.Affected by processing, the two ends that are connected in the second surface between adjacent two first surfaces head and the tail will inevitably be connected with described adjacent two first surfaces with bull nose R2 by filleted corner R1; Even if superb clear angle technique also can only be controlled at 0.1 millimeter by the radius of filleted corner and bull nose.In addition, for the second surface being connected between adjacent two first surfaces head and the tail, as shown in Figure 5 a, mostly existing Fresnel light condensing lens is the form that is designed to tilt towards the focus direction of collector lens, make focus one side of second surface 2b towards collector lens, the fundamental purpose of design is to make second surface produce certain pattern draft like this, the demoulding requirement when meeting lens die moulding; In addition, the Fresnel light condensing lens also having be second surface 2b is designed to vertical with the plane of incidence, i.e. situation as shown in Figure 5 b.
In a word, there is the problem that light loss is larger in above-mentioned Fresnel light condensing lens always.For the Fresnel light condensing lens shown in Fig. 5 a, the light passing through from these three regions of filleted corner R1, cylindrical R2 angle and second surface 2b will all depart from lens focus, and the light passing through from above-mentioned these three regions is by total loss; And for the Fresnel light condensing lens shown in Fig. 5 b, the light passing through from filleted corner R1 and these two regions of bull nose R2 will all depart from lens focus, the light total loss of passing through from these two regions, and because its second surface 2b is vertical with the plane of incidence 3, therefore can be considered on second surface 2b and do not produce light loss.Visible, although the Fresnel light condensing lens light loss shown in Fig. 5 b is little compared with the Fresnel light condensing lens shown in Fig. 5 a, due to the existence of filleted corner and bull nose, therefore the light loss problem of the Fresnel light condensing lens shown in Fig. 5 b is still to be improved.
Summary of the invention
The technical matters that the present invention is intended to solve is to provide the less Fresnel light condensing lens of a kind of light loss.
For this reason, Fresnel light condensing lens of the present invention comprises the plane of incidence and exit facet, the described plane of incidence is plane, described exit facet is provided with the teeth groove of many depressions, described teeth groove has comprised the first surface of optically focused effect and the second surface crossing with this first surface, the two ends of described second surface are connected with the head and the tail of adjacent two first surfaces with bull nose by filleted corner respectively, and described second surface tilts so that be less than when second surface is vertical and the light loss of scioptics when the plane of incidence by the light loss of these lens towards described plane of incidence direction.
Because second surface tilts towards the plane of incidence, second surface is towards the plane of incidence one side of collector lens, therefore the angle between second surface and the plane of incidence is acute angle.When the angle between second surface and the plane of incidence large (being that second surface inclined degree is less than normal), partly overlapping in the radial direction at lens between adjacent filleted corner and bull nose, do not pass through bull nose at overlapping region light, be the loss of only having subregion can produce light in bull nose, therefore the light loss of whole Fresnel light condensing lens is compared when second surface is vertical and reduced when the plane of incidence; In the time that the angle between second surface and the plane of incidence continues to reduce, finally can make light completely not by bull nose region, and now light also can not pass through second surface after first surface deviation, therefore for whole Fresnel light condensing lens, light only produces loss in filleted corner region, the light loss of whole Fresnel light condensing lens is further reduced; If the angle between second surface and the plane of incidence continues to reduce, reach while making part light still can pass through the degree of second surface after first surface deviation, now second surface inclined degree is bigger than normal, the light loss of whole Fresnel light condensing lens will increase thereupon, but still can in to a certain degree, be less than when second surface is vertical and when the plane of incidence and the light loss of scioptics.As can be seen here, the present invention should preferentially select to make second surface inclined degree so that light be not neither also advisable by this second surface by the bull nose being connected with this second surface; Secondly,, if in the case of the degree of tilt of second surface of having to suitably reduce (as lens material is limit etc.), also can select to allow the inclined degree of second surface can make light only by the subregion of the bull nose that is connected with this second surface.
The radius of filleted corner and bull nose is certainly the smaller the better, and the radius of the preferred filleted corner of the present invention and bull nose is below 0.1 millimeter.In addition the projector distance of the two-end-point that, the inclined degree of the preferred second surface of the present invention is second surface on the described plane of incidence is between 0.3 to 0.6 millimeter.
The design of tilting towards the plane of incidence due to second surface makes the pattern draft of second surface for negative, thereby product stripping is caused to obstruction to a certain degree, therefore in the time of product stripping, likely causes Fresnel light condensing lens surface damage.To this, Fresnel light condensing lens of the present invention is preferably made up of the flexible material that does not produce withdrawing pattern damage when the mould molding, such as silica gel.
In sum, Fresnel light condensing lens of the present invention has adopted the structure different from the surperficial teeth groove of existing Fresnel light condensing lens, thereby reduce the loss of light, improved the utilization ratio of luminous energy, as can improve generating efficiency while being used to concentrating photovoltaic power generation field.
In addition, another technical matters that the present invention also will solve is to provide a kind of mould for molding Fresnel condenser lenses, to produce the above-mentioned less Fresnel light condensing lens of this light loss.
For this reason; this mould comprises dynamic model and cover half; on described dynamic model or cover half, be processed with the groove of many depression teeth groove on molding Fresnel condenser lenses exit facet; described groove comprises the second forming surface for the second surface of teeth groove described in moulding; described the second forming surface tilts so that the second surface of the lens after moulding tilts towards the plane of incidence direction of lens along the outside to crown direction towards dynamic model at the bottom of the tooth of groove, and then makes to be less than when second surface is vertical and when the plane of incidence and the light loss of scioptics by the light loss of these lens.
As preferably, the inclined degree of described the second forming surface so that light neither by the bull nose that is connected with described second surface on the lens after moulding also by this second surface.Or, the inclined degree of described the second forming surface so that light only by the subregion of the bull nose that is connected with described second surface on the lens after moulding.
Below in conjunction with the drawings and specific embodiments, the present invention is described further.The aspect that the application is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by the application's practice.
Brief description of the drawings
Fig. 1 is the schematic perspective view of Fresnel light condensing lens of the present invention.
Fig. 2 is that A in Fig. 1 is to diagram.
Fig. 3 is the partial enlarged drawing in Fig. 2.
Fig. 4 a is the schematic diagram of the inclined degree of second surface in lens of the present invention time less than normal.
Fig. 4 b is the schematic diagram of the inclined degree of second surface in lens of the present invention when moderate.
Fig. 4 c is the schematic diagram of the inclined degree of second surface in lens of the present invention time bigger than normal.
Fig. 5 is lens of the present invention and relatively schematic diagram of existing lensed light loss region.
Fig. 5 a is the light loss area schematic of existing lens (second surface is towards focus lopsidedness).
Fig. 5 b is the light loss area schematic of existing lens (second surface is vertical with the plane of incidence).
Fig. 5 c is the light loss area schematic of lens of the present invention.
Fig. 6 is the mould schematic diagram of moulding lens of the present invention.
Fig. 7 is the structural representation of dynamic model in Fig. 6.
Embodiment
Fresnel light condensing lens as shown in Figure 1, comprise the plane of incidence 3 and exit facet 1, the described plane of incidence 3 is plane, and described exit facet 1 is provided with the teeth groove 2 of many depressions, and described teeth groove 2 has comprised the first surface 2a of optically focused effect and the second surface 2b crossing with this first surface 2a, from Fig. 2 to Fig. 3, can know and find out, the two ends of described second surface 2b are connected with the head and the tail of adjacent two first surface 2a with bull nose R2 by filleted corner R1 respectively, and described second surface 2b tilts towards the described plane of incidence 3 directions, and can find out by Fig. 4 a to Fig. 4 c, when the inclined degree of second surface 2b is during in situation less than normal shown in Fig. 4 a, the light A1 injecting perpendicular to the plane of incidence 3 reflects the focus of rear sensing lens from the left end point of the filleted corner R1 that is connected with this second surface 2b, another light A2 injecting perpendicular to the plane of incidence 3 reflects the focus of rear sensing lens from the right endpoint of the bull nose R2 that is connected with this second surface 2b, when by filleted corner R1 and bull nose R2, lose at the pass light beam between light A1 and light A2, no longer converge at focus, but while meriting attention be, due to partly overlapping in the radial direction at lens between adjacent filleted corner R1 and bull nose R2, in overlapping region, (being the region between the right endpoint of filleted corner R1 and the left end point of bull nose R2) light is not by bull nose R2, be on bull nose R2, to only have subregion can produce the loss of light, therefore the light loss of whole Fresnel light condensing lens is compared when second surface 2b is vertical and reduced when the plane of incidence, when the inclined degree of second surface 2b is during in situation as shown in Figure 4 b, the light A1 injecting perpendicular to the plane of incidence 3 reflects the focus of rear sensing lens from the left end point of the filleted corner R1 that is connected with this second surface 2b, another light A2 injecting perpendicular to the plane of incidence 3 from the right endpoint of this filleted corner R1 through and arrive the focus that refraction occurs after the first surface 2a on top and point to lens, because light is not completely by bull nose R2 region, and now light also can not pass through second surface 2b after first surface 2b deviation, therefore for whole Fresnel light condensing lens, light only produces loss in filleted corner R1 region, the light loss of whole Fresnel light condensing lens is further reduced, and when the inclined degree of second surface 2b is during in situation as shown in Fig. 4 c, at this moment, the light A1 injecting perpendicular to the plane of incidence 3 occurs to be about to contact with this second surface 2b after refraction from the left end point of the filleted corner R1 that is connected with this second surface 2b, once when the inclined degree of second surface 2b continues to increase, light A1 will be by second surface 2b, the loss of light will be produced on second surface 2b thus, but nonetheless, the inclined degree that continues to increase second surface 2b in to a certain degree still can make the light loss of scioptics compare when second surface 2b is vertical and less when the plane of incidence.
This shows, optimum selection is to make the inclined degree of second surface 2b so that light is not neither also advisable by this second surface 2b by the bull nose R2 being connected with this second surface 2b.On this basis, preferably make the radius of filleted corner R1 and bull nose R2 below 0.1 millimeter, like this, when the two-end-point of the second surface 2b projector distance D on the described plane of incidence 3 be between 0.3 to 0.6 millimeter, can make light neither by the bull nose R2 that is connected with this second surface 2b also by this second surface 2b.
Fig. 5 is lens of the present invention and relatively schematic diagram of existing lensed light loss region.Wherein, Fig. 5 a is the light loss area schematic of existing lens (second surface 2b is towards focus lopsidedness); Fig. 5 b is the light loss area schematic of existing lens (second surface 2b is vertical with the plane of incidence 3); Fig. 5 c is the light loss area schematic of lens of the present invention (inclined degree of second surface 2b is not so that light neither passes through this second surface 2b by the bull nose R2 being connected with this second surface 2b yet).In Fig. 5 a to Fig. 5 c, the light loss region 4 of the region representation lens between dotted line.From relatively can finding out of three figure, the light loss region 4 in Fig. 5 c is significantly less than the light loss region 4 of Fig. 5 a and Fig. 5 b.
Fresnel light condensing lens of the present invention can pass through silicon gel injection forming, needs to be thus designed to mould.As shown in Figure 6 to 7, mould for molding Fresnel condenser lenses comprises dynamic model 5 and cover half 6, on described dynamic model 5 or cover half 6, be processed with the groove 8 of many depression teeth groove 2 on molding Fresnel condenser lenses exit facet 1, described groove 8 comprises the second forming surface 8b for the second surface 2b of teeth groove described in moulding 2, described the second forming surface 8b tilts along the outside to crown direction towards dynamic model 5 at the bottom of the tooth of groove 8 so that the second surface 2b of the lens after moulding tilts towards the plane of incidence 3 directions of lens, and then make to be less than when second surface 2b is vertical and when the plane of incidence 3 and the light loss of scioptics by the light loss of these lens.
Under moving, the cover half matched moulds state shown in Fig. 6, between dynamic model 5 and cover half 6, can form injection die cavity 7, do not considering under the deformations such as Material shrinkage, the shape of this injection die cavity 7 and size in theory with moulding after the shape, in the same size of Fresnel light condensing lens.
As shown in Figure 7, on described dynamic model 5, the first forming surface 8a of groove 8, for the first surface 2a of molded lens, therefore requires it to have higher machining precision; And because the second surface 2b of lens does not play optically focused effect, as long as ensure that the angle of inclination of second surface 2b is in the scope requiring, therefore the machining precision of mould the second forming surface 8b can suitably reduce, but must ensure as far as possible that the angle between the first forming surface 8a and the second forming surface 8b is wedge angle.
As said above, select because the present invention is preferential to make second surface 2b inclined degree so that light be not neither also advisable by this second surface 2b by the bull nose R2 being connected with this second surface 2b, if in the case of the degree of tilt of second surface 2b of having to suitably reduce (as lens material is limit etc.), also can select to allow the inclined degree of second surface 2b can make light only by the subregion of the bull nose R2 that is connected with this second surface 2b, therefore, in the time of the second forming surface 8b of designing mould also above this condition be as the criterion.
Claims (5)
1. Fresnel light condensing lens, comprise the plane of incidence (3) and exit facet (1), the described plane of incidence (3) is plane, described exit facet (1) is provided with the teeth groove (2) of many depressions, described teeth groove (2) has comprised the first surface (2a) of optically focused effect and the second surface (2b) crossing with this first surface (2a), the two ends of described second surface (2b) are connected with the head and the tail of adjacent two first surfaces (2a) with bull nose (R2) by filleted corner (R1) respectively, it is characterized in that: described second surface (2b) tilts towards the described plane of incidence (3) direction so that be less than when second surface (2b) is vertical and the light loss of scioptics when the plane of incidence (3) by the light loss of these lens, wherein, the inclined degree of described second surface (2b) is not so that light neither passes through this second surface (2b) by the bull nose (R2) being connected with this second surface (2b) yet, now, from the left end point of the filleted corner (R1) that is connected with this second surface (2b), there is directly to point to after refraction the focus of lens in the first light (A1) of injecting perpendicular to the plane of incidence (3), the second light (A2) of injecting perpendicular to the plane of incidence (3) from the right endpoint of this filleted corner (R1) through and arrive the focus that refraction occurs after the first surface (2a) on top and directly point to lens, the incident ray being positioned between the first light (A1) and the second light (A2) of injecting perpendicular to the plane of incidence (3) produces loss in described filleted corner (R1) region.
2. Fresnel light condensing lens as claimed in claim 1, is characterized in that: the radius of described filleted corner (R1) and bull nose (R2) is below 0.1 millimeter.
3. Fresnel light condensing lens as claimed in claim 2, is characterized in that: the projector distance (D) of the two-end-point of described second surface (2b) on the described plane of incidence (3) is between 0.3 to 0.6 millimeter.
4. Fresnel light condensing lens as claimed in claim 1, is characterized in that: this Fresnel light condensing lens is to be made up of the flexible material that does not produce withdrawing pattern damage when the mould molding.
5. Fresnel light condensing lens as claimed in claim 4, is characterized in that: this Fresnel light condensing lens is made up of silica gel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210029157.8A CN102540286B (en) | 2012-02-09 | 2012-02-09 | Fresnel light condensing lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210029157.8A CN102540286B (en) | 2012-02-09 | 2012-02-09 | Fresnel light condensing lens |
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| Publication Number | Publication Date |
|---|---|
| CN102540286A CN102540286A (en) | 2012-07-04 |
| CN102540286B true CN102540286B (en) | 2014-07-23 |
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| CN201210029157.8A Expired - Fee Related CN102540286B (en) | 2012-02-09 | 2012-02-09 | Fresnel light condensing lens |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9507985B2 (en) * | 2014-03-31 | 2016-11-29 | Symbol Technologies, Llc | Optical lens for using in illumination system of imaging scanner |
| FR3071071B1 (en) * | 2017-09-11 | 2023-03-17 | Valeo Vision | FRESNEL LENS WITH VARIABLE DROP ANGLE |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230980A (en) * | 2011-06-24 | 2011-11-02 | 佘晓峰 | Method for manufacturing high-luminous-efficacy focusing solar Fresnel lens |
| CN102590902A (en) * | 2012-02-28 | 2012-07-18 | 四川钟顺太阳能开发有限公司 | Fresnel condenser lens and design method of Fresnel condenser lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100396556B1 (en) * | 2001-10-09 | 2003-09-02 | 삼성전자주식회사 | Screen for projection television |
| US20050041307A1 (en) * | 2003-07-22 | 2005-02-24 | Stephen Barone | Directed Fresnel lenses |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230980A (en) * | 2011-06-24 | 2011-11-02 | 佘晓峰 | Method for manufacturing high-luminous-efficacy focusing solar Fresnel lens |
| CN102590902A (en) * | 2012-02-28 | 2012-07-18 | 四川钟顺太阳能开发有限公司 | Fresnel condenser lens and design method of Fresnel condenser lens |
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