CN202049248U

CN202049248U - Silica gel tooth form surface Fresnel lens

Info

Publication number: CN202049248U
Application number: CN2011200615046U
Authority: CN
Inventors: 章琳
Original assignee: SHANGHAI CORAY TECHNOLOGY Co Ltd
Current assignee: SHANGHAI CORAY TECHNOLOGY Co Ltd
Priority date: 2011-03-10
Filing date: 2011-03-10
Publication date: 2011-11-23
Anticipated expiration: 2021-03-10

Abstract

The present utility model relates to a silica gel tooth form surface Fresnel lens. The lens is composed of a toughening flat ultrawhite glass, a bonding layer and a silica gel layer, and the three parts are connected successively. A Fresnel tooth form surface is formed by the external surface of the silica gel, and composed of a plurality of tooth form concentric circles or broken rings, the tooth form cross section of each ring is a right angled triangle, one right-angle side of the right angled triangle is vertical with the upper surface of the Fresnel lens, that is to say, the incident plane of the sunlight, and the refracting surface of the sunlight is formed by the surface in which the sloping side lies. The tilt angle of the refracting surface of each tooth form of the Fresnel tooth form surface increases from the center to the outside per ring. Compared with the prior art, the Fresnel lens has the advantages of high optical transmissivity, good weatherability, high surface hardness, strong dust storm proof capability, and low material cost.

Description

Silica gel toothed surface Fresnel Lenses

Technical field

The utility model relates to a kind of solar-energy light collector, relates in particular to a kind of silica gel toothed surface Fresnel Lenses.

Background technology

The mankind face energy shortage, the greenhouse effect aggravation, and environmental pollution is serious.Sun power comes into one's own day by day as a kind of main clean energy resource.Present solar electrical energy generation mainly adopts monocrystalline silicon battery, polycrystal silicon cell or hull cell.These several batteries are subjected to the restriction of technology and principle, and efficiency ratio is lower; Compare with traditional energy, cost exceeds more than 1 times, and this becomes one of bottleneck of restriction solar electrical energy generation large-scale application.

The high concentration solar generating technology is a third generation photovoltaic technology.Photospot solar adopts the GaAs battery, and electricity conversion is more than 40%, and light concentrating times is more than 500 times, and the cell area that needs is saved more than 500 times.

Adopt traditional spherical lens can't realize light concentrating times more than 500 times.Must adopt aspheric surface type lens.But adopt aspheric surface type lens to have following problem:

1. aspherical mirror machining difficulty, the cost height.

2. lens thickness is thick, and material cost height, and Heavy Weight are unfavorable for installing.

Salar light-gathering is most at present uses Fresnel Lenses, utilizes the tooth of a series of different angles to realize optically focused, and Fresnel Lenses uses PMMA (polymethylmethacrylate) materials processing to form more.There is following deficiency in the Fresnel Lenses of PMMA material in the Salar light-gathering Application for Field:

1, the PMMA Fresnel Lenses mostly is the unit, the packaging cost height, and package reliability is poor.

2, the PMMA strength of materials is not high, especially is not suitable for large-area fresnel lens array.

3, PMMA material weatherability is good inadequately, and the easy xanthochromia of material down that is exposed to the sun for a long time causes that transmitance descends, and reduces system effectiveness and life-span.

4, PMMA material surface hardness is not high, scratches easily at the wind sand environment lower surface, reduces system effectiveness and life-span.

4, PMMA material expansion coefficient is higher, differs bigger with expansion coefficient such as glass, metals, sealing and fixing difficulty, and be difficult to guarantee long-life of sealing.

The utility model content

The purpose of this utility model is exactly in order to provide the silica gel toothed surface Fresnel Lenses of a kind of optical efficiency height, good weatherability.

In order to achieve the above object, the utility model has adopted following technical scheme: a kind of silica gel toothed surface Fresnel Lenses, be linked in sequence by the dull and stereotyped ultra-clear glasses of tempering, tack coat and layer of silica gel and constitute, the outside surface of layer of silica gel forms the Fresnel toothed surface, this Fresnel toothed surface is made up of a plurality of profile of tooth donuts or abscission ring, the all rectangular triangle in the profile of tooth cross section of each ring, right-angle triangle one right-angle side is the plane of incidence of sunshine perpendicular to the upper surface of Fresnel Lenses, and the face at hypotenuse place forms the plane of refraction of sunshine.

The thickness of the dull and stereotyped ultra-clear glasses of described tempering is 3-5mm, and two-sided all is smooth surface; The thickness of described tack coat is less than 0.1mm; The thickness of described layer of silica gel is not more than 1mm.

The angle of inclination of the plane of refraction of each profile of tooth is outwards increased by ring by the center in the described Fresnel toothed surface.

The a plurality of profile of tooth donuts of described Fresnel toothed surface or the profile of tooth of abscission ring comprise two types, and each profile of tooth of a plurality of profile of tooth donuts of inner part is wide not contour, and the height of profile of tooth increases by ring from inside to outside; The a plurality of profile of tooth donuts of outer part or the profile of tooth of abscission ring are contour not wide, and the width of profile of tooth reduces by ring from inside to outside; The profile of tooth height of the outer shroud of inner part is identical with the profile of tooth height of outer part.

The width of each wide profile of tooth of a plurality of profile of tooth donuts of described inner part is 0.8-1.2mm, and the height of a plurality of profile of tooth donuts of described outer part or each contour profile of tooth of abscission ring is 0.4-0.7mm.

The refractive index of described tack coat is identical with the refractive index of layer of silica gel or close.

The utility model silica gel toothed surface Fresnel Lenses has been owing to adopted above technical scheme, compared with prior art, have following advantage and and characteristics:

1. the utility model employing tempered glass is matrix, has extraordinary weatherability.And the skin hardness height has good anti-dust storm ability.

2. because employing tempered glass is matrix, can make the lens arra that surpasses 2 square meters easily.Compare PMMA lens unit or array, be easy to encapsulation.

3. because employing tempered glass is matrix, the cost of material is low.

4. the layer of silica gel thin thickness in the utility model helps economical with materials, reduces the cost of product.

5. the layer of silica gel thin thickness in the utility model helps improving the optical transmittance of product.

6. the layer of silica gel thin thickness in the utility model effectively reduces the transmitance of silica gel product own and descend, and the product optical transmittance that brings descends.

7. the rectangular triangle of profile of tooth of the Fresnel tooth in the utility model does not have demoulding angle, thereby has improved the optical efficiency of lens.

8. the Fresnel tooth in the utility model divides 2 partial design, and the wide not contour and profile of tooth broad of the profile of tooth of inner part has the less number of teeth, and the crown of each Fresnel tooth and tooth root all can't be accomplished wedge angle completely, so this part is a lightproof part.The minimizing of the Fresnel number of teeth can provide the efficient of lens.

9. the Fresnel tooth in the utility model divides 2 partial design, the profile of tooth of outer part is contour not wide, defines the degree of depth of tooth, has reduced because the decline of the lens efficiency that the silica gel distortion brings, the Zui Da minimizing Fresnel number of teeth again, thus the efficient of silica-gel lens effectively improved.

10. the tooth Shape Design of the outer part of the Fresnel tooth in the utility model is contour, make this part crown and tooth root respectively on same, help the production technology of silica-gel lens array.

Description of drawings

Fig. 1 is the planar structure synoptic diagram of the utility model silica gel toothed surface Fresnel Lenses;

Fig. 2 is the broken section structural representation of the utility model silica gel toothed surface Fresnel Lenses;

Fig. 3 is the tooth-shape structure synoptic diagram of the utility model silica gel toothed surface Fresnel Lenses;

The 3*3 array synoptic diagram that Fig. 4 is made up of the utility model silica gel toothed surface Fresnel Lenses.

Embodiment

Referring to Fig. 1, Fig. 2, silica gel toothed surface Fresnel Lenses of the present utility model, be linked in sequence by the dull and stereotyped ultra-clear glasses 1 of tempering, tack coat 2 and layer of silica gel 3 and constitute, the outside surface of layer of silica gel 3 forms the Fresnel toothed surface, this Fresnel toothed surface is made up of a plurality of profile of tooth donuts 31 or abscission ring 32, the all rectangular triangle 33 in the profile of tooth cross section of each ring, right-angle triangle one right-angle side 331 is the plane of incidence of sunshine perpendicular to the upper surface of Fresnel Lenses, and the face at hypotenuse 332 places forms the plane of refraction of sunshine.

The thickness of the dull and stereotyped ultra-clear glasses of the tempering in the utility model is 3-5mm, and two-sided all is smooth surface; The thickness of tack coat is less than 0.1mm; The thickness of layer of silica gel is not more than 1mm.

The angle of inclination of the plane of refraction of each profile of tooth is outwards increased by ring by the center in the Fresnel toothed surface in the utility model.

Cooperation is referring to Fig. 3, and a plurality of profile of tooth donuts of the Fresnel toothed surface in the utility model or the profile of tooth of abscission ring comprise two types, and each profile of tooth of a plurality of profile of tooth donuts of inner part is wide not contour, and the height of profile of tooth increases by ring from inside to outside; The a plurality of profile of tooth donuts of outer part or the profile of tooth of abscission ring are contour not wide, and the width of profile of tooth reduces by ring from inside to outside; The profile of tooth height of the outer shroud of inner part is identical with the profile of tooth height of outer part.Wherein, the width of each wide profile of tooth of a plurality of profile of tooth donuts of inner part is 0.8-1.2mm, and the height of a plurality of profile of tooth donuts of outer part or each contour profile of tooth of abscission ring is 0.4-0.7mm.

The refractive index of the tack coat in the utility model is identical with the refractive index of layer of silica gel or close.

Silica gel toothed surface Fresnel Lenses of the present utility model can closely rearrange any array greater than 2*2 by a plurality of unit, is 3*3 array synoptic diagram as Fig. 4.

Claims

1. silica gel toothed surface Fresnel Lenses, it is characterized in that: being linked in sequence by the dull and stereotyped ultra-clear glasses of tempering, tack coat and layer of silica gel constitutes, the outside surface of layer of silica gel forms the Fresnel toothed surface, this Fresnel toothed surface is made up of a plurality of profile of tooth donuts or abscission ring, the all rectangular triangle in the profile of tooth cross section of each ring, right-angle triangle one right-angle side is the plane of incidence of sunshine perpendicular to the upper surface of Fresnel Lenses, and the face at hypotenuse place forms the plane of refraction of sunshine.

2. silica gel toothed surface Fresnel Lenses as claimed in claim 1 is characterized in that: the thickness of the dull and stereotyped ultra-clear glasses of described tempering is 3-5mm, and two-sided all is smooth surface; The thickness of described tack coat is less than 0.1mm; The thickness of described layer of silica gel is not more than 1mm.

3. silica gel toothed surface Fresnel Lenses as claimed in claim 1 is characterized in that: the angle of inclination of the plane of refraction of each profile of tooth is outwards increased by ring by the center in the described Fresnel toothed surface.

4. silica gel toothed surface Fresnel Lenses as claimed in claim 3, it is characterized in that: a plurality of profile of tooth donuts of described Fresnel toothed surface or the profile of tooth of abscission ring comprise two types, each profile of tooth of a plurality of profile of tooth donuts of inner part is wide not contour, and the height of profile of tooth increases by ring from inside to outside; The a plurality of profile of tooth donuts of outer part or the profile of tooth of abscission ring are contour not wide, and the width of profile of tooth reduces by ring from inside to outside; The profile of tooth height of the outer shroud of inner part is identical with the profile of tooth height of outer part.

5. silica gel toothed surface Fresnel Lenses as claimed in claim 4, it is characterized in that: the width of each wide profile of tooth of a plurality of profile of tooth donuts of described inner part is 0.8-1.2mm, and the height of a plurality of profile of tooth donuts of described outer part or each contour profile of tooth of abscission ring is 0.4-0.7mm.

6. silica gel toothed surface Fresnel Lenses as claimed in claim 1 is characterized in that: the refractive index of described tack coat is identical with the refractive index of layer of silica gel or close.