Fresnel lens mold

Abstract

The utility model relates to a Fresnel lens die which comprises a plurality of die steel pieces which are sequentially spliced together in an overlapped mode, and each die steel piece is provided with a first positioning hole and a second positioning hole. The double-thread screw sequentially penetrates through the first positioning holes in the die steel pieces and locks the nuts at the two ends of the double-thread screw, a step face with the high outer side and the low middle is formed at one end of each die steel piece, and the step faces form an optical-level cylindrical face or a concave spherical face after being machined. And the double-thread screw sequentially penetrates through the second positioning holes in the die steel pieces and locks the nuts at the two ends of the double-thread screw, one end of each die steel piece forms a tooth-shaped surface matched with the Fresnel lens, the other end of each die steel piece is flush with the tooth-shaped surface, and therefore the cylindrical or spherical die for the Fresnel lens is formed. The Fresnel lens mold is simple in structure, simple in manufacturing process and low in cost, and large-size Fresnel lenses can be produced with low cost and high efficiency.

Description

A Fresnel lens mold Technical Field

[0001] This utility model relates to the field of optical component manufacturing mold technology, specifically to a Fresnel lens mold. Background Technology

[0002] Fresnel lenses are flat lenses that improve upon traditional lenses by utilizing the periodicity of phase retardation. Due to their advantages such as thinness and lightness and material savings, they are widely used in lighting, solar energy collection, and AR / VR head-mounted displays. Traditional Fresnel lens molds are generally machined by turning, resulting in poor surface quality. Large-size Fresnel lenses are usually made of optical plastics, whose size is limited by the manufacturing process, and the plastic material has disadvantages such as poor UV resistance and short lifespan. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a Fresnel lens mold.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A Fresnel lens mold includes multiple mold steel parts stacked together in sequence, each mold steel part having a first positioning hole and a second positioning hole respectively;

[0006] The double-ended screw passes through the first positioning hole on each mold steel part in sequence and locks the nuts at both ends of the double-ended screw. One end of each mold steel part forms a stepped surface with a high outer side and a low middle side. After processing, the stepped surface forms an optical grade cylindrical surface or concave spherical surface.

[0007] The double-ended screw passes through the second positioning hole on each mold steel part in sequence and locks the nuts at both ends of the double-ended screw. One end of each mold steel part forms a toothed surface that matches the Fresnel lens, and the other end of each mold steel part is flush, thus forming a mold for a cylindrical or spherical Fresnel lens.

[0008] In one embodiment, the mold steel component is a mold steel plate, and the width of the stripes at the corresponding positions of the mold steel plates and the cylindrical Fresnel lens is the same.

[0009] In another embodiment, the mold steel component located in the middle position is a mold steel column, and the mold steel components in other positions are mold steel rings. The diameter of the mold steel column is the same as the stripe in the middle position of the spherical Fresnel lens, and the thickness of each mold steel ring is the same as the width of the stripe at the corresponding position of the spherical Fresnel lens.

[0010] Furthermore, the outermost mold steel component is secured by two semi-circular steel rings.

[0011] The present invention adopts the above technical solution and has the following beneficial effects:

[0012] 1. The Fresnel lens mold of this utility model has a simple structure, is easy to manufacture, and has low cost;

[0013] 2. On a flat glass production line, during the glass softening stage, the mold of this invention is used to press out the required Fresnel lens shape. Its advantage lies in its compatibility with traditional flat glass production lines, enabling low-cost and high-efficiency production of large-size Fresnel lenses. Attached Figure Description

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0015] Figure 1 is a front view of the various mold steel parts connected together through the first positioning hole in Embodiment 1 of this utility model;

[0016] Figure 2 is a top view of the various mold steel parts connected together through the first positioning hole in Embodiment 1 of this utility model;

[0017] Figure 3 is a schematic diagram of the mold steel parts in Embodiment 1 of this utility model;

[0018] Figure 4 is a front view of each mold steel part in Figure 1 after cutting and polishing;

[0019] Figure 5 is a front view of the various mold steel parts connected together through the second positioning hole in Embodiment 1 of this utility model;

[0020] Figure 6 is a front view of the various mold steel parts connected together through the first positioning hole in Embodiment 2 of this utility model;

[0021] Figure 7 is a schematic diagram of the mold steel parts in Embodiment 2 of this utility model;

[0022] Figure 8 is a front view of the various mold steel parts connected together through the second positioning hole in Embodiment 2 of this utility model;

[0023] Figure 9 is a top view of the various mold steel parts connected together through the second positioning hole in Embodiment 2 of this utility model. Detailed Implementation

[0024] Example 1, as shown in Figures 1-5, specifically relates to a cylindrical Fresnel lens mold, comprising multiple mold steel parts 11 stacked sequentially. Each mold steel part 11 is a mold steel plate, and the width of the stripes on each mold steel plate corresponding to the cylindrical Fresnel lens is the same. Each mold steel part 11 is provided with a first positioning hole 111 and a second positioning hole 112. The specific positions of the first positioning hole 111 and the second positioning hole 112 on each mold steel part 11 are designed according to specific needs.

[0025] The double-ended screw 12 passes through the first positioning hole 111 on each mold steel part 11 in sequence and locks the nuts 13 at both ends of the double-ended screw 12. One end of each mold steel part 11 forms an arc-shaped stepped surface 110 with a high outer side and a low middle side (this stepped surface is similar to the overall curvature arc surface of the cylindrical Fresnel lens). After the stepped surface is processed by cutting and polishing, it forms an optical grade cylindrical surface 113.

[0026] Loosen the aforementioned nut 13, remove the double-ended screw 12, and then pass the double-ended screw 12 through the second positioning hole 112 on each mold steel part 11 in sequence and lock the nuts 13 at both ends of the double-ended screw 12. One end of each mold steel part 11 forms a toothed surface 114 that matches the cylindrical Fresnel lens, and the other end of each mold steel part 11 is flush, thereby forming a cylindrical Fresnel lens mold.

[0027] Example 2, as shown in Figures 6-9, specifically relates to a spherical Fresnel lens mold, comprising multiple mold steel parts 21 stacked sequentially. The mold steel part 21 located in the middle position is a mold steel pillar, while the mold steel parts 22 in other positions are mold steel rings. The diameter of the mold steel pillar is the same as the stripe at the middle position of the spherical Fresnel lens, and the thickness of each mold steel ring is the same as the width of the corresponding stripe at the spherical Fresnel lens. Each mold steel part 21 is provided with a first positioning hole 211 and a second positioning hole 212. The specific positions of the first positioning hole 211 and the second positioning hole 212 on each mold steel part 21 are designed according to specific needs.

[0028] The double-ended screw 22 passes through the first positioning hole 211 on each mold steel part 21 in sequence and locks the nuts 23 at both ends of the double-ended screw 22. One end of each mold steel part 21 forms a (ring-shaped) stepped surface 210 with a high outer side and a low middle side (this stepped surface is similar to the overall curvature arc surface of the spherical Fresnel lens). After the stepped surface is processed by cutting and polishing, it forms an optical-grade concave spherical surface.

[0029] Loosen the aforementioned nut 23, remove the double-ended screw 22, and pass the double-ended screw 22 sequentially through the second positioning holes 212 on each mold steel part 21. Then, tighten it around the outermost mold steel part 21 using two semi-circular steel rings 24. The double-ended screw 22 also passes through the two semi-circular steel rings 24. Finally, tighten the nuts at both ends of the double-ended screw 22. One end of each mold steel part 21 forms a toothed surface 214 that matches the spherical Fresnel lens, and the other end of each mold steel part 21 is flush, thus forming a spherical Fresnel lens mold.

[0030] In this invention, the Fresnel lens processing mold is used as follows: during the glass softening stage on a glass flat production line, the mold is used to imprint the desired Fresnel lens shape. Its advantage lies in its compatibility with traditional flat glass production lines, enabling the low-cost and high-efficiency production of large-size Fresnel lenses.

[0031] The specific embodiments of this utility model have been described above. However, those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this embodiment without departing from the principle and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.

Claims

1. A Fresnel lens mold, characterized in that: The system comprises multiple mold steel parts stacked sequentially, each mold steel part having a first positioning hole and a second positioning hole; a double-ended screw passes sequentially through the first positioning hole on each mold steel part and locks the nuts at both ends of the double-ended screw; one end of each mold steel part forms a stepped surface with a higher outer side and a lower middle side, and the stepped surface is processed to form an optical-grade cylindrical surface or concave spherical surface; the double-ended screw passes sequentially through the second positioning hole on each mold steel part and locks the nuts at both ends of the double-ended screw; one end of each mold steel part forms a toothed surface that matches a Fresnel lens, and the other end of each mold steel part is flush, thereby forming a mold for a cylindrical or spherical Fresnel lens.

2. The Fresnel lens mold according to claim 1, characterized in that: The mold steel parts are mold steel plates, and the width of the stripes at the corresponding positions of the mold steel plates and the cylindrical Fresnel lenses is the same.

3. The Fresnel lens mold according to claim 1, characterized in that: The mold steel component located in the middle position is the mold steel column, and the mold steel components in other positions are mold steel rings. The diameter of the mold steel column is the same as the stripe in the middle position of the spherical Fresnel lens, and the thickness of each mold steel ring is the same as the width of the stripe at the corresponding position of the spherical Fresnel lens.

4. A Fresnel lens mold according to claim 3, characterized in that: The outermost mold steel part is tightened by two semi-circular steel rings.

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