TWI444667B - Method for manufacturing ball fresnel lens - Google Patents

Description

Spherical Fresnel lens processing method

The present invention relates to a method of processing an optical component, and more particularly to a method of processing a Fresnel lens.

Solar focusing applications can significantly reduce system cost in the field of photovoltaics; high-temperature heat collection can be achieved in the field of light and heat. Therefore, the prospects are promising. One of the important means of achieving solar focus is the use of Fresnel lenses.

In order to collect as much ambient sunlight as possible, a spherical Fresnel lens is available in the prior art. The spherical Fresnel lens is processed with a plurality of tiny Fresnel lenses to focus the surrounding light on the spherical Fresnel lens center. When the solar cell is placed at the center of the sphere, the flat plate can be obtained. The lens has more solar energy.

However, although this spherical Fresnel lens can collect more sunlight than a flat Fresnel lens, when the spherical Fresnel lens is integrally formed by injection molding, since its shape is spherical, it will The size of the mold is too large, which is not convenient for the manufacture of the spherical Fresnel lens.

In view of this, it is necessary to provide a method of processing a spherical Fresnel lens which is convenient to manufacture.

The molding has a first Fresnel micromirror structure centered on a regular hexagon, six positive a first element of a hexagonal second Fresnel micromirror structure that is connected to each side of the first Fresnel micromirror structure; the first element is bent into a spherical crown; and the molding has a plurality of Fresnel a second element of the micromirror structure; the second element is bent into an arcuate structure having the same curvature as the first element after bending; and the plurality of second elements are wound around the first element The first element is bonded end to end in a hemispherical shape.

The processing method provided by the invention forms a spherical Fresnel lens by using a plurality of planar lenses, and then forms by bending and splicing. Thus, it is possible to process with a smaller mold for molding a flat lens, which facilitates the manufacture of a spherical Fresnel lens.

100‧‧‧spherical Fresnel lens

9‧‧‧Fresnel micromirror structure

1‧‧‧ first tablet

10‧‧‧ first component

11‧‧‧First Fresnel micromirror structure

12‧‧‧Second Fresnel micromirror structure

120‧‧‧ first side

121‧‧‧ second side

2‧‧‧ second tablet

20‧‧‧second component

21‧‧‧ Third Fresnel Micromirror Structure

210‧‧‧ third side

211‧‧‧ fourth side

212‧‧‧ fifth side

22‧‧‧Four Fresnel micromirror structure

220‧‧‧ sixth side

221‧‧‧ seventh side

23‧‧‧ fifth Fresnel micromirror structure

230‧‧‧ fifth Fresnel micromirror structure side

3‧‧‧ third tablet

30‧‧‧ third component

31‧‧‧ sixth Fresnel micromirror structure

4‧‧‧fourth tablet

40‧‧‧ fourth component

41‧‧‧ seventh Fresnel micromirror structure

1 is a schematic view of a spherical Fresnel lens processed by the spherical Fresnel lens processing method provided by the present invention; FIG. 2 is a schematic side view of the spherical Fresnel lens of FIG. 1; FIG. 3 is a processing method provided by the present invention. Schematic diagram of the processing process of the first element of the spherical Fresnel lens; FIG. 4 is a schematic view showing the processing process of the second element of the spherical Fresnel lens in the processing method provided by the present invention; FIG. 5 is a spherical phenanthrene in the processing method provided by the present invention Schematic diagram of the processing process of the third component of the Ner lens; FIG. 6 is a schematic view showing the processing process of the fourth component of the spherical Fresnel lens in the processing method provided by the present invention.

The invention will be further described in detail below with reference to the accompanying drawings.

1 and 2, a spherical Fresnel lens 100 manufactured by the method of processing a spherical Fresnel lens provided by the present invention, the spherical Fresnel lens 100 being hemispherical. The spherical Fresnel lens 100 is formed by splicing a first component 10, six second components 20, six third components 30, and six fourth components 40. Each element has a Fresnel micromirror structure 9 provided with a polygon, and each Fresnel micromirror structure 9 is provided with an equidistant concentric circular tooth structure (not shown), of course, the Fresnel micromirror structure 9 Other shapes of the stripe structure can also be set.

The first component 10 includes a hexagonal first Fresnel micromirror structure 11 and six hexagonal second Fresnel micromirror structures 12. The six second Fresnel micromirror structures 12 are arranged around the first Fresnel mirror structure 11.

The second element 20 includes a pentagonal third Fresnel micromirror structure 21, three hexagonal fourth Fresnel micromirror structures 22, and two heptagonal fifth Fresnel micros Mirror structure 23. The fourth Fresnel micromirror structure 22 and the fifth Fresnel micromirror structure 23 are arranged around the third Fresnel mirror structure 21. Six second elements are arranged around the first element 10. The third element 30 is hexagonal, and the third element 30 is filled in a gap between the first element 10 and the second element 20. The fourth element 40 is a heptagonal shape, and the fourth element 40 is filled in a gap between the two second elements 20.

The processing method of the above spherical Fresnel lens 100 includes the following steps:

Referring to FIG. 3, the molding process of the first component 10 includes the following steps:

(A1) Forming a first flat plate 1 having a plurality of Fresnel micromirror structures. In this embodiment, the first flat plate 1 includes a hexagonal first Fresnel micromirror structure 11 and six hexagonal second Fresnel micromirror structures 12. The second Fresnel micromirror structure includes a first side 120 and a second side 121 disposed opposite to each other, the six second Fresnel micro The mirror structure 12 is arranged around the first Fresnel mirror structure 11, and the first side 120 of the second Fresnel mirror structure 12 is connected to each side of the first Fresnel mirror structure 11. . In the present embodiment, the first flat plate 1 is produced by hot pressing a transparent acryl with a vacuum forming machine that molds a flat Fresnel lens.

(B1) The first flat plate 1 is cut into the first member 10. In this embodiment, the excess material except the first Fresnel micromirror structure 11 and the second Fresnel micromirror structure 12 in the first flat plate 1 is cut off to form a first one that can be bent into a spherical crown shape. Element 10.

(C1) The first member 10 is bent into a spherical crown shape by a bending process.

Referring to FIG. 4, the molding process of the second component 20 includes the following steps:

(A2) Forming a second flat plate 2 having a plurality of Fresnel micromirror structures. In the embodiment, the second flat plate 2 is formed with a pentagonal third Fresnel micromirror structure 21, three hexagonal fourth Fresnel micromirror structures 22 and two heptagons. The fifth Fresnel micromirror structure 23. The third Fresnel micromirror structure 21 includes a third side 210, two fourth sides 211 connected to the third side 210, and two fifth sides 212 connected to the two fourth sides 211, respectively. The fourth Fresnel micromirror structure 22 includes an opposite sixth side 220 and a seventh side 221 . Each of the fourth Fresnel micromirror structures 22 and each of the fifth Fresnel micromirror structures 23 are arranged around the third Fresnel micromirror structure 21, and the three fourth Fresnel micromirror structures The sixth side 220 of the 22 is in contact with the third side 210 and the fourth side 211, respectively. One side 230 of each of the fifth Fresnel mirror structures 23 is in contact with the fifth side 212 of the third Fresnel mirror structure 21, respectively. In the present embodiment, the second flat plate 2 is produced by the same process as the first flat plate 1.

(B2) Cutting the second flat plate 2 into the second member 20. In this embodiment, the third Fresnel micromirror structure 21 and the fourth Fresnel micromirror structure 22 are removed from the second flat plate 2 and Excess material outside the fifth Fresnel micromirror structure 23 is cut away to form the second member 20 that can be curved into a curved surface.

(C2) The second member 20 is bent into a curved surface structure having the same curvature as the bent first member 10 by a bending process.

Referring to FIG. 5, the molding process of the third component 30 includes the following steps:

(A3) A third flat plate 3 having a sixth Fresnel mirror structure 31 is formed. In the present embodiment, the third flat plate 3 is produced by the same process as the first flat plate 1.

(B3) A hexagonal third member 30 is cut out from the third flat plate 3.

Referring to FIG. 6, the molding process of the fourth component 40 includes the following steps:

(A4) A fourth flat plate 4 having a seventh Fresnel mirror structure 41 is formed. In the present embodiment, the fourth flat plate 4 is produced by the same process as the first flat plate 1.

(B4) The seventh element 40 of the heptagon is cut out from the fourth flat plate 4.

Referring to FIG. 1 and FIG. 2, the six second elements 20 are bonded to the first element 10 by a glue into a hemispherical shape. In this embodiment, the sixth side of the fourth Fresnel micromirror structure 22 is used. 221 is bonded to the second side 121 of the second Fresnel micromirror structure 12 while the third side 210 of the third Fresnel micromirror structure 21 and the second Fresnel micromirror structure The second side 121 of 12 corresponds. And filling the gap between the first component 10 and the second component 20 with six third components 30. The fourth element 40 fills the gap between the fourth Fresnel micromirror structure 22 and the fifth Fresnel mirror structure 23 of the two second elements 20. Thereby a spherical Fresnel lens 100 is constructed.

Of course, the first component 10, the second component 20, the third component 30, and the fourth component 40 can also be subjected to a cutting step when molding, and directly use the mold to form an unbent first. Element 10, second element 20, third element 30 and fourth element 40. The sixth flat plate 2 may also be formed with a sixth Fresnel micro mirror structure 31 or a seventh Fresnel micro mirror structure 41 according to the arrangement in FIGS. 1 and 2, or a sixth Fresnel formed at the same time. The micromirror structure 31 and the seventh Fresnel micromirror structure 41 omits the fabrication steps of the third element 30 and the fourth element 40.

The processing method provided by the invention forms a spherical Fresnel lens by using a plurality of planar lenses, and then forms by bending and splicing. Thus, it is possible to process with a smaller mold for molding a flat lens, which facilitates the manufacture of a spherical Fresnel lens.

In addition, those skilled in the art can make other changes in the spirit of the invention, and all changes that are made according to the spirit of the invention should be included in the scope of the invention.

100‧‧‧spherical Fresnel lens

9‧‧‧Fresnel micromirror structure

1‧‧‧ first tablet

10‧‧‧ first component

11‧‧‧First Fresnel micromirror structure

12‧‧‧Second Fresnel micromirror structure

20‧‧‧second component

21‧‧‧ Third Fresnel Micromirror Structure

22‧‧‧Four Fresnel micromirror structure

23‧‧‧ fifth Fresnel micromirror structure

230‧‧‧ fifth Fresnel micromirror structure side

30‧‧‧ third component

40‧‧‧ fourth component

Claims (9)

A spherical Fresnel lens processing method, the method comprising the steps of: molding one side of a second Fresnel micromirror structure having six regular hexagons centered on a first Fresnel micromirror structure a first element that is in contact with each side of the first Fresnel micromirror structure; the first element is bent into a spherical crown; and a third Fresnel micromirror structure having a pentagon is formed as a center, three a sixth Fresnel micromirror structure of the hexagon and a second element of the two hemigonal fifth Fresnel micromirror structures connected to each side of the third Fresnel micromirror structure; The second member is bent into an arcuate structure having the same curvature as the first member after the bending; and the plurality of second members are bonded end to end in the hemispherical shape around the first member. The method of processing a spherical Fresnel lens according to claim 1, wherein, in the step of molding the first component, the method further comprises the step of: molding the first having a plurality of regular hexagonal Fresnel micromirror structures a flat plate; the first flat plate is cut into a first member. The spherical Fresnel lens processing method according to claim 1, wherein in molding the second component having a plurality of Fresnel micromirror structures, the method further comprises the steps of: forming a plurality of Fresnel micros a second plate of the mirror structure; the second plate is cut into a second element. The spherical Fresnel lens processing method according to claim 1, wherein the Fresnel micromirror structure is processed with an equidistant concentric circular pattern. The method of processing a spherical Fresnel lens according to claim 1, wherein in the step of molding the first component, the second Fresnel micromirror structure comprises a first side and a second side disposed opposite to each other, a first side of the second Fresnel micromirror structure for use with the first Fresnel micromirror structure The sides are connected. The method of processing a spherical Fresnel lens according to claim 5, wherein in the step of molding a second flat plate having a plurality of Fresnel micromirror structures, forming the third phenanthrene on the second flat plate Nyer micromirror structure, the three fourth Fresnel micromirror structures, two heptagonal fifth Fresnel micromirror structures, a hexagonal sixth Fresnel micromirror structure and a seven An eighth Fresnel micromirror structure, wherein the third Fresnel micromirror structure comprises two third sides, two fourth sides connected to the third side, and two fourth sides respectively Two fifth sides of the connection, the fourth Fresnel micromirror structure and each fifth Fresnel micromirror structure are disposed around the third Fresnel micromirror structure, and the fourth Fresnel One side of the micromirror structure is respectively connected to the third side and the fourth side, and one side of each of the fifth Fresnel micromirror structures is respectively opposite to the fifth side of the third Fresnel micromirror structure The sixth Fresnel micromirror structure is disposed at a gap between two adjacent fourth Fresnel micromirror structures, the seventh phenanthrene The Neel micromirror structure is disposed at a gap between the fourth Fresnel micromirror structure and the fifth Fresnel micromirror structure. The method of processing a spherical Fresnel lens according to claim 6, wherein the third side of the third Fresnel micromirror structure is bonded when the second component is bonded to the first component. The second side of the second Fresnel micromirror structure corresponds. The method of processing a spherical Fresnel lens according to claim 6, wherein in the step of molding the second flat plate having a plurality of Fresnel micromirror structures, the sixth Fresnel micro is further included The step of separately forming the mirror structure, the step comprising: forming a third plate having a sixth Fresnel micromirror structure; and cutting a hexagonal third element from the third plate. The method of processing a spherical Fresnel lens according to claim 6, wherein in the step of molding the second flat plate having a plurality of Fresnel micromirror structures, the seventh Fresnel micromirror is further included The step of separately molding the structure, the step comprising: forming a fourth plate having a seventh Fresnel micromirror structure; and cutting a seventh element of the heptagon from the fourth plate.