Mold, and lens manufacturing method

Abstract

Provided in the present invention are a mold and a lens manufacturing method. The mold is used for compression molding of lenses, and comprises a first mold and a second mold matching the first mold, wherein the first mold comprises: a first mold body, a plurality of first molding portions, which are formed on the side of the first mold body close to the second mold and have arc-shaped surfaces, ring-shaped second molding portions respectively formed on the peripheries of the first molding portions, and ring-shaped first balance rings formed on the peripheries of the second molding portions; and the second mold comprises: a second mold body, a plurality of ring-shaped third molding portions formed on the side of the second mold body close to the first mold, ring-shaped fourth molding portions respectively surrounding the peripheries of the third molding portions, and ring-shaped second balance rings formed on the peripheries of the fourth molding portions. Compared with the prior art, lenses manufactured by the mold and the lens manufacturing method of the present invention have consistent molding pressure, the production efficiency is high, and molded products are attractive.

Description

Mold and lens preparation methods Technical Field

[0001] This invention relates to the field of mold technology, and in particular to a mold and a method for preparing a lens. Background Technology

[0002] The basic process of lens manufacturing usually involves placing a thin sheet of material on the surface of a lower mold, pressing the upper mold against the lower mold to form the thin sheet of material, and then cutting the formed lens into individual lenses as required or applying it directly. Technical issues

[0003] The mold in the related technology includes an upper mold and a lower mold. The upper mold has multiple upper forming parts, and the lower mold has multiple lower forming parts. The upper and lower forming parts correspond to form a mold cavity. The upper forming parts have recessed parts and flat parts away from the recessed parts, and the upper forming parts also have protrusions and flat parts away from the recessed parts. Thin sheet material is extruded by the upper and lower molds to form a lens. However, the multiple upper and lower forming parts are arranged in an array, which leads to inconsistent forming pressure between the inner and outer rings. This results in significant differences in the forming of the inner and outer rings, and some rings have poor appearance.

[0004] Therefore, it is necessary to provide a new mold to solve the above-mentioned technical problems. Technical solutions

[0005] The purpose of this invention is to provide a mold that provides consistent lens forming pressure, high production efficiency, and aesthetically pleasing finished products.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a mold for lens molding, the mold comprising a first mold and a second mold matching the first mold;

[0007] The first mold includes a first mold body, a plurality of first molding portions with an arc-shaped surface formed on the side of the first mold body near the second mold, a second molding portion in an annular shape formed on the outer periphery of each first molding portion, and a first balancing ring in an annular shape formed on the outer periphery of the second molding portion; the second molding portion surrounds the corresponding first molding portion; the first balancing ring surrounds the corresponding second molding portion, and the first balancing ring makes the outer periphery of the second molding portion inclined to transition with the side of the first mold body near the second mold;

[0008] The second mold includes a second mold body, a plurality of third molding portions in an annular shape formed by the side of the second mold body near the first mold, a fourth molding portion in an annular shape formed around the outer periphery of each of the third molding portions, and a second balancing ring in an annular shape formed by the outer periphery of the fourth molding portion; the second balancing ring transitions the outer periphery of the fourth molding portion with the side of the second mold body near the first mold.

[0009] The first mold body and the second mold body are correspondingly arranged, the first molding part and the third molding part correspond to each other and are spaced apart to form a first gap, and the optical part of the lens is located in the first gap; the second molding part and the fourth molding part correspond to each other and are spaced apart to form a second gap, and the structural part of the lens is located in the second gap; the first balance ring and the second balance ring correspond to each other and are spaced apart to form a third gap, and the auxiliary part of the lens is located in the third gap.

[0010] Preferably, the plurality of first molding parts are arranged in an array, and the plurality of third molding parts are arranged in an array.

[0011] Preferably, the thickness of the first gap gradually increases from its center toward the direction close to the second gap, and the thickness of the third gap gradually decreases from its side close to the second gap toward the direction away from the second gap.

[0012] Preferably, the thickness of the optical part gradually increases from its center to its outer edge; the thickness of the inner edge of the structural part is the same as the thickness of the outer edge of the optical part, and the thickness of the inner edge of the structural part gradually decreases from its outer edge; the thickness of the auxiliary part gradually decreases from the thickness near the outer edge of the structural part to the thickness away from the outer edge of the structural part.

[0013] Preferably, the first forming part is formed by protruding from the side of the first mold body near the second mold body, the second forming part is formed by recessing from the side of the first mold body near the second mold body, and the first balancing ring is formed by recessing from the side of the first mold body near the second mold body.

[0014] The third forming part is formed by recessing the second mold body inward from the side of the second mold body close to the first mold body, the fourth forming part is formed by recessing the second mold body inward from the side of the second mold body close to the second mold body, and the second balance ring is formed by recessing the second mold body inward from the side of the second mold body close to the first mold body; wherein, the recess depth of the third forming part is less than the recess depth of the fourth forming part.

[0015] Preferably, the thickness of the first gap gradually decreases from its center along the direction close to the second gap, the thickness of the third gap gradually increases from the side close to the second gap to the side away from the second gap, and the thickness of the third gap is less than the thickness of the first gap.

[0016] Preferably, the thickness of the optical part gradually decreases along its outer edge; the thickness of the inner edge of the structural part is the same as the thickness of the outer edge of the optical part, and the thickness of the inner edge of the structural part gradually increases along its outer edge; the thickness of the auxiliary part gradually increases from the thickness near the outer edge of the structural part to the thickness away from the outer edge of the structural part.

[0017] Preferably, the first molding part is formed by a recess on the side of the first mold body near the second mold body, the second molding part is formed by a protrusion on the first mold body near the second mold body, and the first balancing ring is formed by a recess on the side of the first mold body near the second mold body.

[0018] The third forming part is formed by a recess on the side of the second mold body near the first mold body, the fourth forming part is formed by a recess on the side of the second mold body near the second mold body, and the second balancing ring is formed by a horizontal extension of the second mold body near the first mold body.

[0019] Preferably, the thickness of the first gap is equal to the thickness of the second gap, and the thickness of the third gap gradually decreases from the side closer to the second gap to the side farther away from the second gap.

[0020] Preferably, the center thickness of the optical part is the same as the thickness of its outer edge; the thickness of the inner edge of the structural part is the same as the thickness of the outer edge of the optical part, and the thickness of the inner edge of the structural part gradually increases along the direction of its outer edge; the thickness of the auxiliary part gradually decreases from the thickness near the outer edge of the structural part to the thickness away from the outer edge of the structural part.

[0021] Preferably, the first forming part is formed by protruding from the side of the first mold body near the second mold body, the second forming part is formed by recessing into the side of the first mold body near the second mold body, and the first balancing ring is formed by protruding from the side of the first mold body near the second mold body.

[0022] The third forming part is formed by a recess on the side of the second mold body close to the first mold body, the fourth forming part is formed by a recess on the side of the second mold body close to the second mold body, and the second balance ring is formed by a recess on the side of the second mold body close to the first mold body.

[0023] Preferably, the first balancing ring and the second balancing ring together achieve overflow or flow obstruction.

[0024] Secondly, embodiments of the present invention provide a lens manufacturing method, the manufacturing method being implemented based on the aforementioned mold;

[0025] The preparation method includes the following steps:

[0026] S1. Provide the thin sheet material for the lens to be manufactured;

[0027] S2. The thin sheet material is stacked on the upper surface of the second mold;

[0028] S3. Heat the second mold to soften the sheet material;

[0029] S4. Align the first mold with the second mold and place them on the sheet material;

[0030] S5. A lens blank is formed by pressing the first mold under a preset pressure;

[0031] S6. The portion of the lens blank corresponding to the third gap is cut off to obtain the finished lens. Beneficial effects

[0032] Compared with the prior art, in the mold of the present invention, the first mold includes a first mold body, a plurality of first molding portions with arc-shaped surfaces formed on the side of the first mold body near the second mold, a second molding portion in an annular shape formed on the outer periphery of each first molding portion, and a first balancing ring in an annular shape formed on the outer periphery of the second molding portion; the second molding portion surrounds the corresponding first molding portion; the first balancing ring surrounds the corresponding second molding portion, and the first balancing ring achieves an inclined transition between the outer periphery of the second molding portion and the side of the first mold body near the second mold; the second mold includes a second mold body, a plurality of third molding portions in an annular shape formed on the side of the second mold body near the first mold, a plurality of fourth molding portions in an annular shape formed on the outer periphery of each third molding portion, and a second balancing ring in an annular shape formed on the outer periphery of the fourth molding portion; the second balancing ring achieves a transition between the outer periphery of the fourth molding portion and the side of the second mold body near the first mold; the first mold body and the second mold body are correspondingly arranged. By setting a first balance ring and a second balance ring on the outer periphery of the second molding part and the fourth molding part respectively, the molding pressure of the first gap and the second gap can be easily adjusted through the first balance ring and the second balance ring, thereby adjusting the consistency of the molding of the inner and outer ring cavities and shortening the molding cycle. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0034] Figure 1 is a three-dimensional structural diagram of the mold provided in Embodiment 1 of the present invention;

[0035] Figure 2 is a cross-sectional view along line AA in Figure 1;

[0036] Figure 3 is a magnified view of part B in Figure 2;

[0037] Figure 4 is a diagram showing the molding process of the mold provided in Embodiment 2 of the present invention.

[0038] Figure 5 is a diagram showing the mold in separate use according to Embodiment 2 of the present invention;

[0039] Figure 6 is a three-dimensional structural diagram of the mold provided in Embodiment 3 of the present invention;

[0040] Figure 7 is a cross-sectional view along line CC of Figure 6;

[0041] Figure 8 is a magnified view of part D in Figure 7;

[0042] Figure 9 is a three-dimensional structural diagram of the mold provided in Embodiment 4 of the present invention;

[0043] Figure 10 is a cross-sectional view of the EE line in Figure 9;

[0044] Figure 11 is a magnified view of part F in Figure 10;

[0045] Figure 12 is a flowchart of the lens preparation method provided in an embodiment of the present invention.

[0046] In the figure, 100 is the mold, 1 is the first mold, 11 is the first mold body, 12 is the first forming part, 13 is the second forming part, 14 is the first balancing ring, 2 is the second mold, 21 is the second mold body, 22 is the third forming part, 23 is the fourth forming part, 24 is the second balancing ring, 3 is the first gap, 4 is the second gap, 5 is the third gap, and 20 is the lens. Embodiments of the present invention

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Example 1

[0049] Referring to Figures 1 to 5, this embodiment of the invention provides a mold 100 for molding a lens 20. The mold 100 includes a first mold 1 and a second mold 2 that matches the first mold 1. The first mold 1 is the upper mold, and the second mold 2 is the lower mold. By placing a sheet material on the upper surface of the second mold 2, the sheet material is compressed by the first mold 1 corresponding to the second mold 2. By increasing a preset molding pressure, the sheet material is shaped as required to obtain the desired lens 20.

[0050] The first mold 1 includes a first mold body 11, a plurality of first molding portions 12 with arc-shaped surfaces formed on the side of the first mold body 11 near the second mold 2, a second molding portion 13 extending in a ring around the outer periphery of each of the first molding portions 12, and a ring-shaped first balancing ring 14 formed on the outer periphery of the second molding portion 13. The second molding portion 13 surrounds the corresponding first molding portion 12; the first balancing ring 14 surrounds the corresponding second molding portion 13, and the first balancing ring 14 provides an inclined transition between the outer periphery of the second molding portion 13 and the side of the first mold body 11 near the second mold 2. The second mold 2 includes a second mold body 21, a plurality of third molding portions 22 forming in a ring shape on the side of the second mold body 21 near the first mold 1, a fourth molding portion 23 forming in a ring shape around the outer periphery of each of the third molding portions 22, and a ring-shaped second balancing ring 24 formed on the outer periphery of the fourth molding portion 23. The second balancing ring 24 provides a transition between the outer periphery of the fourth molding portion 23 and the side of the second mold body 21 near the first mold 1.

[0051] In this embodiment, the first molding part 12, the second molding part 13, the third molding part 22, the fourth molding part 23, the first balance ring 14, and the second balance ring 24 are all circular structures.

[0052] The first mold body 11 and the second mold body 21 are correspondingly arranged. The first forming part 12 and the third forming part 22 correspond to each other and are spaced apart to form a first gap 3, with the optical part of the lens located within the first gap 3. The second forming part 13 and the fourth forming part 23 correspond to each other and are spaced apart to form a second gap 4, with the structural part of the lens located within the second gap 4. The first balancing ring 14 and the second balancing ring 24 correspond to each other and are spaced apart to form a third gap 5, with the auxiliary part of the lens located within the third gap 5. By providing the first balancing ring 14 and the second balancing ring 24 on the outer periphery of the second forming part 13 and the fourth forming part 23 respectively, the forming pressure at the positions of the first gap 3 and the second gap 4 can be easily adjusted through the first balancing ring 14 and the second balancing ring 24, thereby adjusting the consistency of the forming of the inner and outer ring cavities and shortening the forming cycle.

[0053] By setting different first gap 3, second gap 4 and third gap 5, a variety of different lens structures can be obtained, such as concave lenses or convex lenses.

[0054] In this embodiment, a plurality of first forming parts 12 are arranged in an array, and a plurality of third forming parts 22 are arranged in an array. This results in a large number of lenses 20 being formed, leading to high production efficiency.

[0055] In this embodiment, the structures of the first balance ring 14 and the second balance ring 24 can be the same or different, thereby allowing for more precise adjustment of the internal and external molding pressure and molding time.

[0056] Example 2

[0057] Referring to Figures 1 to 5, based on Embodiment 1, in this embodiment, the thickness of the first gap 3 gradually increases from its center towards the direction closer to the second gap 4, while the thickness of the third gap 5 gradually decreases from its side closer to the second gap 4 towards the direction farther from the second gap 4. The sheet material is molded using the first mold 1 and the second mold 2, causing the sheet material to be extruded and shaped within the first gap 3, the second gap 4, and the third gap 5. By gradually increasing the thickness of the first gap 3 from its center towards the side closer to the second gap 4, the lens 20 forms a cap-shaped structure with a thin center and thick edges. By adding a balance ring structure formed by the third gap 5 to the edge of the lens 20, the forming pressure of the outer ring acupoints can be significantly increased, shortening the forming time of the outer ring acupoints.

[0058] In this embodiment, the center thickness of the optical part gradually increases along its outer edge; the thickness of the inner edge of the structural part is the same as the thickness of the outer edge of the optical part, and the thickness of the inner edge of the structural part gradually decreases along its outer edge; the thickness of the auxiliary part gradually decreases from the thickness near the outer edge of the structural part to the thickness away from the outer edge of the structural part.

[0059] In this embodiment, the plane relative to the outer periphery of the first mold 1 and the second mold 2 is used as the reference plane. The first forming part 12 is formed by protruding from the side of the first mold body 11 near the second mold body 21, the second forming part 13 is formed by recessing from the side of the first mold body 11 near the second mold body 21, and the first balancing ring 14 is formed by recessing from the side of the first mold body 11 near the second mold body 21. The third forming part 22 is formed by recessing from the side of the second mold body 21 near the first mold body 11, the fourth forming part 23 is formed by recessing from the side of the second mold body 21 near the second mold body 21, and the second balancing ring 24 is formed by recessing from the side of the second mold body 21 near the first mold body 11. The recess depth of the third forming part 22 is less than the recess depth of the fourth forming part 23. This facilitates the molding of a concave mirror that is thin at the center and thick at the edges. By setting the first balancing ring 14 and the second balancing ring 24 at the closing position, the molding pressure of the outer ring cavity can be significantly increased, and the molding time of the outer ring cavity can be shortened.

[0060] Optionally, the first forming part 12 can be recessed, and the third forming part 22 can be protruding, so that the thickness of the center of the first gap 3 gradually increases along the side close to the second gap 4, forming a lens structure that is thin in the center and thick at the edges. The first balancing ring 14 and the second balancing ring 24 can be either recessed or both recessed, as long as the connection between the second gap 4 and the first gap 3 forms a tapered structure.

[0061] Example 3

[0062] Referring to Figures 6 to 8, based on Embodiment 1, in this embodiment, the thickness of the first gap 3 gradually decreases from its center towards the second gap 4, and the thickness of the third gap 5 gradually increases from its side near the second gap 4 towards the side away from the second gap 4, and the thickness of the third gap 5 is less than the thickness of the first gap 3. The sheet material is molded using the first mold 1 and the second mold 2, so that the sheet material is extruded and formed within the first gap 3, the second gap 4, and the third gap 5. By gradually decreasing the thickness of the first gap 3 from its center towards the side near the second gap 4, the lens 20 forms a lens structure that is thicker in the center and thinner at the edges. By adding a balance ring structure formed by the third gap 5 to the edge of the lens 20, the forming pressure of the inner acupoints can be significantly increased, and the forming time of the inner acupoints can be shortened.

[0063] In this embodiment, the center thickness of the optical part gradually decreases along its outer edge; the thickness of the inner edge of the structural part is the same as the thickness of the outer edge of the optical part, and the thickness of the inner edge of the structural part gradually increases along its outer edge; the thickness of the auxiliary part gradually increases from the thickness near the outer edge of the structural part to the thickness away from the outer edge of the structural part.

[0064] In this embodiment, the first molding part 12 is recessed on the side of the first mold body 11 near the second mold body 21, the second molding part 13 is protruding from the first mold body 11 near the second mold body 21, and the first balancing ring 14 is recessed on the side of the first mold body 11 near the second mold body 21. The third molding part 22 is recessed on the side of the second mold body 21 near the first mold body 11, the fourth molding part 23 is recessed on the side of the second mold body 21 near the second mold body 21, and the second balancing ring 24 extends horizontally from the side of the second mold body 21 near the first mold body 11. This facilitates the molding of a convex mirror with a thick center and thin edges. By positioning the first balancing ring 14 and the second balancing ring 24 at the opening, the molding pressure of the inner ring cavity can be significantly increased, and the molding time of the outer ring cavity can be shortened.

[0065] Optionally, the first balancing ring 14 and the second balancing ring 24 can be formed by one of them being recessed or both being recessed, as long as the connection position between the second gap 4 and the first gap 3 forms an open structure.

[0066] Example 4

[0067] Referring to Figures 9 to 11, based on Embodiment 1, in this embodiment, the thickness of the first gap 3 is equal to the thickness of the second gap 4, and the thickness of the third gap 5 gradually decreases from the side closer to the second gap 4 to the side farther away from the second gap 4. The sheet material is molded using the first mold 1 and the second mold 2, causing the sheet material to be extruded and formed within the first gap 3, the second gap 4, and the third gap 5. By making the thickness of the first gap 3 equal to the thickness of the second gap 4, the lens 20 forms a structure lens with equal thickness at the center and edges. By adding a balance ring structure formed by the third gap 5 to the edge of the lens 20, the forming pressure of the outer ring acupoints can be significantly increased, shortening the forming time of the outer ring acupoints.

[0068] In this embodiment, the center thickness of the optical part is the same as the thickness of its outer edge; the thickness of the inner edge of the structural part is the same as the thickness of the outer edge of the optical part, and the thickness of the inner edge of the structural part gradually increases along the direction of its outer edge; the thickness of the auxiliary part gradually decreases from the thickness near the outer edge of the structural part to the thickness away from the outer edge of the structural part.

[0069] In this embodiment, the first molding part 12 protrudes from the side of the first mold body 11 near the second mold body 21, the second molding part 13 is recessed from the side of the first mold body 11 near the second mold body 21, and the first balancing ring 14 protrudes from the side of the first mold body 11 near the second mold body 21; the third molding part 22 is recessed from the side of the second mold body 21 near the first mold body 11, the fourth molding part 23 is recessed from the side of the second mold body 21 near the second mold body 21, and the second balancing ring 24 is recessed from the side of the second mold body 21 near the first mold body 11. This facilitates the molding of a concave mirror that is thin at the center and thick at the edges. By placing the first balancing ring 14 and the second balancing ring 24 at the closing position, the molding pressure of the outer ring cavity can be significantly increased, shortening the molding time of the outer ring cavity.

[0070] In this embodiment, the first balance ring 14 and the second balance ring 24 together achieve overflow or flow obstruction.

[0071] Compared with the prior art, in the mold of the present invention, the first mold includes a first mold body, a plurality of first molding portions with arc-shaped surfaces formed on the side of the first mold body near the second mold, a second molding portion in an annular shape formed on the outer periphery of each first molding portion, and a first balancing ring in an annular shape formed on the outer periphery of the second molding portion; the second molding portion surrounds the corresponding first molding portion; the first balancing ring surrounds the corresponding second molding portion, and the first balancing ring achieves an inclined transition between the outer periphery of the second molding portion and the side of the first mold body near the second mold; the second mold includes a second mold body, a plurality of third molding portions in an annular shape formed on the side of the second mold body near the first mold, a plurality of fourth molding portions in an annular shape formed on the outer periphery of each third molding portion, and a second balancing ring in an annular shape formed on the outer periphery of the fourth molding portion; the second balancing ring achieves a transition between the outer periphery of the fourth molding portion and the side of the second mold body near the first mold; the first mold body and the second mold body are correspondingly arranged. By setting a first balance ring and a second balance ring on the outer periphery of the second molding part and the fourth molding part respectively, the molding pressure of the first gap and the second gap can be easily adjusted through the first balance ring and the second balance ring, thereby adjusting the consistency of the molding of the inner and outer ring cavities and shortening the molding cycle.

[0072] Example 5

[0073] Referring to Figures 1 to 12, this embodiment of the invention provides a lens manufacturing method, which is implemented based on the mold 100 of Embodiments 1 to 4 above;

[0074] The preparation method includes the following steps:

[0075] S1. Provide the thin film material for the lens to be prepared.

[0076] The thin sheet material can be optical glass or quartz glass, etc.

[0077] S2. The thin sheet material is stacked on the upper surface of the second mold 2.

[0078] S3. The second mold 2 is heated to soften the sheet material.

[0079] S4. Align the first mold 1 with the second mold 2 and place them on the sheet material.

[0080] S5. A lens blank is formed by pressing the first mold 1 under a preset pressure. By ensuring that the forming pressure of the inner and outer rings of the first balance ring 14 and the second balance ring 24 is consistent, the forming pressure and forming time of the inner and outer rings can be adjusted more precisely.

[0081] S6. The position of the lens blank corresponding to the third gap 5 is cut off to obtain the finished lens.

[0082] Specifically, by horizontally fixing the second mold 2 to the ground or workbench, the sheet material is placed on the upper surface of the second mold 2. A heating device is used to heat the second mold 2 and the sheet material to soften it. The first mold 1 is then used to mold the second mold 2, forming a lens blank from the sheet material. After cooling the lens blank to room temperature, a laser cutting device is used to cut away portions of the lens blank formed in the third gap 5 according to predetermined requirements, resulting in the finished lens. This ensures consistent forming pressure on the inner and outer rings of the lens, allowing for more precise adjustment of the forming pressure and time.

[0083] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A mold for lens molding, said mold comprising a first mold and a second mold mating with the first mold; characterized in that, The first mold includes a first mold body, a plurality of first molding portions with an arc-shaped surface formed on the side of the first mold body near the second mold, a second molding portion in an annular shape formed on the outer periphery of each first molding portion, and a first balancing ring in an annular shape formed on the outer periphery of the second molding portion; the second molding portion surrounds the corresponding first molding portion; the first balancing ring surrounds the corresponding second molding portion, and the first balancing ring makes the outer periphery of the second molding portion inclined to transition with the side of the first mold body near the second mold; The second mold includes a second mold body, a plurality of third molding portions in an annular shape formed by the side of the second mold body near the first mold, a fourth molding portion in an annular shape formed around the outer periphery of each of the third molding portions, and a second balancing ring in an annular shape formed by the outer periphery of the fourth molding portion; the second balancing ring transitions the outer periphery of the fourth molding portion with the side of the second mold body near the first mold. The first mold body and the second mold body are correspondingly arranged, the first molding part and the third molding part correspond to each other and are spaced apart to form a first gap, and the optical part of the lens is located in the first gap; the second molding part and the fourth molding part correspond to each other and are spaced apart to form a second gap, and the structural part of the lens is located in the second gap; the first balance ring and the second balance ring correspond to each other and are spaced apart to form a third gap, and the auxiliary part of the lens is located in the third gap.

2. The mold according to claim 1, characterized in that, The first molding parts are arranged in an array, and the third molding parts are arranged in an array.

3. The mold according to claim 1, characterized in that, The thickness of the first gap gradually increases from its center toward the direction closer to the second gap, and the thickness of the third gap gradually decreases from its side closer to the second gap toward the direction farther away from the second gap.

4. The mold according to claim 3, characterized in that, The thickness of the optical part gradually increases from its center along its outer edge; the thickness of the inner edge of the structural part is the same as the thickness of the outer edge of the optical part, and the thickness of the inner edge of the structural part gradually decreases along its outer edge; the thickness of the auxiliary part gradually decreases from the thickness near the outer edge of the structural part to the thickness away from the outer edge of the structural part.

5. The mold according to claim 4, characterized in that, The first molding part is formed by protruding from the side of the first mold body near the second mold body, the second molding part is formed by recessing from the side of the first mold body near the second mold body, and the first balance ring is formed by recessing from the side of the first mold body near the second mold body. The third forming part is formed by recessing the second mold body inward from the side of the second mold body close to the first mold body, the fourth forming part is formed by recessing the second mold body inward from the side of the second mold body close to the second mold body, and the second balance ring is formed by recessing the second mold body inward from the side of the second mold body close to the first mold body; wherein, the recess depth of the third forming part is less than the recess depth of the fourth forming part.

6. The mold according to claim 1, characterized in that, The thickness of the first gap gradually decreases from its center along the direction close to the second gap, and the thickness of the third gap gradually increases from the side close to the second gap to the side away from the second gap, and the thickness of the third gap is less than the thickness of the first gap.

7. The mold according to claim 6, characterized in that, The thickness of the optical part gradually decreases along its outer edge from its center; the thickness of the inner edge of the structural part is the same as the thickness of the outer edge of the optical part, and the thickness of the inner edge of the structural part gradually increases along its outer edge; the thickness of the auxiliary part gradually increases from the thickness near the outer edge of the structural part to the thickness away from the outer edge of the structural part.

8. The mold according to claim 7, characterized in that, The first molding part is formed by a recess on the side of the first mold body near the second mold body, the second molding part is formed by a protrusion on the first mold body near the second mold body, and the first balance ring is formed by a recess on the side of the first mold body near the second mold body. The third forming part is formed by a recess on the side of the second mold body near the first mold body, the fourth forming part is formed by a recess on the side of the second mold body near the second mold body, and the second balancing ring is formed by a horizontal extension of the second mold body near the first mold body.

9. The mold according to claim 1, characterized in that, The thickness of the first gap is equal to the thickness of the second gap, and the thickness of the third gap gradually decreases from the side closer to the second gap to the side farther away from the second gap.

10. The mold according to claim 9, characterized in that, The center thickness of the optical part is the same as the thickness of its outer edge; the thickness of the inner edge of the structural part is the same as the thickness of the outer edge of the optical part, and the thickness of the inner edge of the structural part gradually increases along the direction of its outer edge; the thickness of the auxiliary part gradually decreases from the thickness near the outer edge of the structural part to the thickness away from the outer edge of the structural part.

11. The mold according to claim 10, characterized in that, The first molding part is formed by protruding from the side of the first mold body near the second mold body, the second molding part is formed by recessing into the side of the first mold body near the second mold body, and the first balance ring is formed by protruding from the side of the first mold body near the second mold body. The third forming part is formed by a recess on the side of the second mold body close to the first mold body, the fourth forming part is formed by a recess on the side of the second mold body close to the second mold body, and the second balance ring is formed by a recess on the side of the second mold body close to the first mold body.

12. The mold according to claim 1, characterized in that, The first and second balance rings work together to achieve either overflow or flow obstruction.

13. A method for preparing a lens, characterized in that, The preparation method is based on the mold described in any one of claims 1-12; The preparation method includes the following steps: S1. Provide the thin sheet material for the lens to be manufactured; S2. The thin sheet material is stacked on the upper surface of the second mold; S3. Heat the second mold to soften the sheet material; S4. Align the first mold with the second mold and place them on the sheet material; S5. A lens blank is formed by pressing the first mold under a preset pressure; S6. The portion of the lens blank corresponding to the third gap is cut off to obtain the finished lens.

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