CN1762866A - Optical lens forming mold - Google Patents

Abstract

The invention relates to an optical lens forming mold, which mainly comprises a first mold and a second mold. The first mold has a first mold surface, the second mold has a second mold surface, and the second mold forms a mold cavity corresponding to the first mold. In the molding process, the flowing speed of the glass material is controlled by the difference of the surface roughness of the first mold surface and the second mold surface or the difference of the friction force of the first mold surface and the second mold surface relative to the glass material, so as to obtain the glass lens with the shape meeting the requirement. The optical lens forming mold can simplify the manufacturing process, reduce the cost of forming materials and reduce the manufacturing time, thereby saving the production cost of the optical lens.

Description

Optical lens forming mold

technical field

The invention relates to a forming mold, in particular to an optical lens forming mold which can save lens production cost.

Background technique

In recent years, with the development and progress of science and technology, various optical products, including cameras, digital cameras, video cameras, digital video cameras, fax machines, photocopiers, CD players, scanners and projectors, etc., have continued to improve in performance and drop in price. It has gradually become popular in ordinary daily life.

General optical products have precision optical lens elements. Optical lenses can generally be divided into two types: spherical lenses and aspheric lenses. Among them, spherical lenses generally need to use spherical correction lenses to compensate for aberrations, and the overall lens set uses more lenses and is heavier. On the contrary, the aspherical lens can reduce the spherical aberration of the spherical lens in terms of optical effect, so that the quality of the lens can be improved, and the overall lens group uses fewer lenses and is lighter in weight. Therefore, it is widely used in optical products.

Based on the above, in the existing known manufacturing technology of aspheric optical glass lenses, a mold or sleeve is usually matched with a pair of upper mold and lower mold to form a mold cavity, and the glass material will soften when exposed to high temperature. The characteristics of the glass material in the mold cavity are molded by the pressurization process of the upper mold or the lower mold. After these processes, the surface shape of the upper mold surface and the lower mold surface will be transferred to the glass material to obtain an optical glass lens with a surface shape that meets the requirements. Afterwards, after the preliminarily formed optical glass lens is subjected to a core-taking process, the production of the optical glass lens can be completed.

Please refer to FIG. 1 , which is a schematic cross-sectional view of a conventional optical lens forming mold. The conventional optical lens forming mold 100 is applied to the molding of a glass material 80 . The optical lens forming mold 100 includes an upper mold 110 and a lower mold 120 . Wherein, the upper mold 110 has an upper mold surface 112 . In addition, the lower mold 120 corresponds to the upper mold 110 to form a mold cavity 122 for placing the glass nitrate material 80 . The lower mold 120 has a lower mold surface 124 , wherein the upper mold surface 212 and the lower mold surface 224 have the same surface roughness.

Please also refer to FIG. 2A to FIG. 2C , which are schematic diagrams of various steps of molding glass nitrate material by a conventional optical lens forming mold. First, as shown in FIG. 2A , in the prior art, a glass nitrate material 80 is usually first ground into a shape similar to that of the required glass lens, that is, a preform, and then placed on the On the mold cavity 122 of the lower mold 120, heat and soften the glass nitrate material 80, and at the same time press the upper mold 110 downward gradually.

Next, as shown in Figure 2B, when utilizing the upper mold 110 and the lower mold 120 to mold the glass nitrate material 80, since the glass nitrate material 80 has been ground into a preform, it is easier to mold the glass nitrate material 80 to meet the requirements. face shape.

Afterwards, as shown in FIG. 2C , the upper mold 110 is separated from the lower mold 120 to obtain a glass lens blank 80a with a surface shape meeting the requirement.

In the above-mentioned method, it is necessary to spend manpower and equipment to first grind the glass nitrate material 80 into a preform whose surface shape is similar to that of the required glass lens and then mold it, thus increasing the production cost of the glass lens.

Please also refer to FIG. 3A to FIG. 3C , which are schematic diagrams of steps for molding glass nitrate material by another conventional optical lens molding mold. In the existing conventional method, in order to omit the process of grinding the glass nitrate material 50 into a preform and save the production cost of the glass lens, another molding method is adopted. First, as shown in FIG. 3A , directly place an oval glass nitrate material 50 on the mold cavity 122 of the lower mold 120 , and heat and soften the glass nitrate material 50 , and at the same time press the upper mold 110 downward gradually.

Next, as shown in Figure 3B, when the upper mold 110 and the lower mold 120 molded the glass nitrate material 50, since the roughness of the lower mold surface 124 was equal to the roughness of the upper mold surface 112, the glass nitrate material 50 and the lower mold The flow rate at the interface of the surface 124 is equal to the flow rate at the interface of the glass nitrate material 50 with the lower mold surface 124 . Therefore, the part of the glass nitrate material 50 in contact with the lower mold surface 124 is easy to extend to both sides. If a smaller glass nitrate material 50 is used, the molded surface shape 52a cannot reach the desired shape. Therefore, it is necessary to use a larger glass material 50 to obtain the required surface shape 52b, so as to achieve the effect of complete transfer.

Afterwards, as shown in FIG. 3C , the upper mold 110 is separated from the lower mold 120 to obtain a glass lens blank 50 a with a surface shape meeting the requirement.

However, in the above-mentioned method, since the volume of the glass nitrate material 50 extending to both sides is relatively large during molding, it is necessary to use a larger volume of glass nitrate material 50 , resulting in a waste of the cost of the glass nitrate material 50 . In addition, it takes a long time to remove these parts extending to both sides during the core-taking process. In addition, since the glass nitrate material 50 is easy to extend to both sides, the stroke of its surface shape transfer is relatively large, and the friction time between the mold and the glass nitrate material 50 is also long, thereby reducing the service life of the mold.

This shows that the above-mentioned existing optical lens molding die obviously still has inconvenience and defects in structure and use, and needs to be further improved urgently. In order to solve the problems existing in optical lens forming molds, relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure for general products to solve the above problems. Obviously, it is a problem that relevant industry players are eager to solve.

In view of the defects in the above-mentioned existing optical lens forming molds, the inventor actively researches and innovates based on years of rich practical experience and professional knowledge engaged in the design and manufacture of such products, and cooperates with the application of academic theories, in order to create a new type of structure The optical lens forming mold can improve the general existing optical lens forming mold and make it more practical. Through continuous research, design, and after repeated trial samples and improvements, the present invention with practical value is finally created.

Contents of the invention

The object of the present invention is to overcome the existing defects in the existing optical lens molding dies, and provide a new optical lens molding die, the technical problem to be solved is mainly by the surface roughness of the upper mold surface and the lower mold surface Different to manufacture optical lenses, or to manufacture optical lenses by the friction of the upper and lower mold surfaces relative to the material to be formed. Since there is no need to spend manpower and materials to make the preform (Preform), it can save the production cost of the lens. Therefore, it is more suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. According to the present invention, an optical lens forming mold is applied to the molding of a material to be formed. The optical lens forming mold includes: a first mold with a protruding first mold surface; and a second mold, Corresponding to the first mold and having a concave second mold surface, the second mold is provided with a cavity for placing the material to be formed, wherein the surface roughness of the first mold surface and the second mold surface are different.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the aforementioned optical lens forming mold, the surface of the second mold is rougher than the surface of the first mold.

In the aforementioned optical lens forming mold, the surface roughness of the second mold is 15-20 microns, and the roughness of the first mold surface is 0.1-0.7 microns.

The aforementioned optical lens forming mold, wherein the first and the second mold surfaces are polished with diamond powder, and the particle size of the diamond powder polished on the second mold surface is coarser than that of the polished first mold surface .

In the aforementioned optical lens forming mold, the first mold surface and the second mold surface are made of different materials.

In the aforementioned optical lens forming mold, the material to be formed is one of glass and polymer.

The purpose of the present invention and the solution to its technical problems are also achieved by the following technical solutions. According to the present invention, an optical lens forming mold is applied to the molding of a material to be formed. The optical lens forming mold includes: a first mold with a protruding first mold surface; and a second mold, Corresponding to the first mold and having a concave second mold surface, the second mold is provided with a mold cavity for placing the material to be formed, wherein the first mold surface and the second mold surface are relative to the material to be formed Friction is different.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the aforementioned optical lens forming mold, wherein the frictional force of the second mold surface relative to the material to be formed is greater than the frictional force of the first mold surface relative to the material to be formed.

In the aforementioned optical lens forming mold, the surface of the second mold is rougher than the surface of the first mold.

In the aforementioned optical lens forming mold, the first mold surface and the second mold surface are made of different materials.

In the aforementioned optical lens molding mold, the surface temperature of the first mold surface and the second mold surface are different when the material to be molded is molded.

In the aforementioned optical lens forming mold, the surface roughness of the second mold is 15-20 microns, and the roughness of the first mold surface is 0.1-0.7 microns.

The aforementioned optical lens forming mold, wherein the first and the second mold surfaces are polished with diamond powder, and the particle size of the diamond powder used to polish the second mold surface is larger than that of the polished first mold surface Those who are coarse.

In the aforementioned optical lens forming mold, the material to be formed is one of glass and polymer.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. As can be seen from the above technical solutions, in order to achieve the aforementioned object of the invention, the main technical contents of the present invention are as follows:

The invention provides an optical lens forming mold, which includes a first mold and a second mold. Wherein, the first mold has a protruding first mold surface, and the second mold corresponds to the first mold and has a concave second mold surface. The second mold has a cavity for placing the material to be formed. In addition, the surface roughness of the first and second mold surfaces is different.

The present invention also provides an optical lens forming mold, which includes a first mold and a second mold. Wherein, the first mold has a protruding first mold surface, and the second mold corresponds to the first mold and has a concave second mold surface. The second mold has a cavity for placing the material to be formed. Furthermore, the first mold surface and the second mold surface have different friction forces with respect to the material to be formed.

With the above technical solution, the optical lens forming mold of the present invention has at least the following advantages:

1, the present invention is because of adopting the different molding dies of surface roughness, or the frictional force of two mold surfaces with respect to the material to be formed is different, so that the velocity that molding material flows on the surface of the upper mold is different from the velocity that flows on the surface of the lower mold, and then Mold an optical lens whose shape meets the requirements.

2. The use of the optical lens forming mold does not need to grind the material to be formed into a preform, so the lens manufacturing process can be simplified.

3. In addition, since the material to be formed is less likely to extend to both sides during molding, the material with a smaller volume can be used to reduce the cost of the material.

4. Moreover, when the core-taking process is performed, it takes less time to remove these parts extending to both sides.

5. In addition, because the material to be formed is not easy to extend to both sides, the transfer stroke of the surface shape is small, and the friction time between the mold and the material to be formed is shorter, so the time for surface shape transfer can be reduced and the mold can be increased. service life.

To sum up, the optical lens molding mold with special structure of the present invention mainly manufactures optical lenses by the difference in surface roughness between the upper mold surface and the lower mold surface, or by the difference between the upper and lower mold surfaces relative to the material to be formed. Different friction forces are used to manufacture optical lenses. With this optical lens forming mold, since there is no need to spend manpower and materials to make a preform (Preform), it can simplify the manufacturing process, reduce the cost of molding materials and reduce manufacturing time, thereby saving the cost of optical lenses. Cost of production. It has the above-mentioned many advantages and practical value, and there is no similar structural design publicly published or used in similar products, so it is indeed innovative. It has great improvements in both structure and function, and has a great technical advantage. It has improved, and produced easy-to-use and practical effects, and has improved multiple functions compared with the existing optical lens forming molds, so it is more suitable for practical use, and has a wide range of industrial application value. It is a novel, progressive and practical tool. new design.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a structural cross-sectional view of a known optical lens molding die.

2A to 2C are schematic diagrams of various steps of molding glass nitrate material by a conventional optical lens forming mold.

3A to 3C are schematic diagrams of steps of molding glass nitrate material by another conventional optical lens forming mold.

Fig. 4 is a structural cross-sectional view of a preferred embodiment of the optical lens forming mold of the present invention.

5A to 5C are schematic diagrams of the various steps of molding the glass material by the optical lens forming mold of the present invention.

Fig. 6 is a structural sectional view of another preferred embodiment of the optical lens forming mold of the present invention.

50, 80: glass nitrate material 50a, 80a: glass lens embryo

100: Optical lens forming mold 110, 210: Upper mold

112, 212: Upper mold surface 120, 220: Lower mold

122, 222: Mold cavity 124, 224: Lower mold surface

200a, 200b: optical lens forming mold

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, characteristics and effects of the optical lens forming mold proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. , as detailed below.

The optical lens forming mold of the present invention is used to mold a material to be formed into an optical lens, wherein the material to be formed is usually glass or optical polymer, and the material to be formed in the following two preferred embodiments will be an oval glass Glass nitrate material is used as an example for illustration, but the scope of application of the present invention should not be limited to glass nitrate material.

first embodiment

Please refer to FIG. 4 , which is a structural sectional view of an optical lens forming mold according to a preferred embodiment of the present invention. This embodiment proposes an optical lens forming mold 200 a, which is applied to molding an oval glass material 50 . The optical lens forming mold 200a includes an upper mold 210 and a lower mold 220 . Wherein, the upper mold 210 has an upper mold surface 212 . In addition, the lower mold 220 corresponds to the upper mold 210 to form a cavity 222 suitable for placing the glass material 50 . The lower mold 220 has a lower mold surface 224 , wherein the upper mold surface 212 and the lower mold surface 224 have different surface roughnesses.

In the above-mentioned optical lens molding mold 200a, the structure and reason of the different surface roughness of the upper mold surface 212 and the lower mold surface 224, for example, the upper mold surface 212 and the lower mold surface 224 are made of different materials, or for example, the lower mold surface The roughness of the mold surface 224 is greater than the roughness of the upper mold surface 212 . Wherein, the roughness of the lower mold surface 224 is, for example, 15-20 microns, and the roughness of the upper mold surface 212 is, for example, 0.1-0.7 microns.

The method for making the upper mold surface 212 and the lower mold surface 224 have different roughnesses, for example, is to polish the diamond powder with different particle sizes for several minutes, so that the upper mold surface 212 and the lower mold surface 224 have different roughnesses. Wherein, the lower mold surface 224 is polished with, for example, 10-micron diamond powder, and the upper mold 212 is, for example, polished with 0.5-micron diamond powder.

Please also refer to FIG. 5A to FIG. 5C , which are schematic diagrams of each step of molding the glass material by the optical lens molding mold of this embodiment.

First, as shown in FIG. 5A , place an oval glass nitrate material 50 on the mold cavity 222 of the lower mold 220 , and heat and soften the glass nitrate material 50 , and simultaneously press the upper mold 210 downward gradually.

Next, as shown in Figure 5B, when the upper mold 210 and the lower mold 220 mold the glass nitrate material 50, since the roughness of the lower mold surface 224 is greater than the roughness of the upper mold surface 212, the glass nitrate material 50 and the upper mold surface The flow rate at the contact surface 212 is higher than the flow rate at the contact surface between the glass nitrate material 50 and the lower mold surface 224 . Therefore, the part where the glass nitrate material 50 is in contact with the upper mold surface 212 is easier to mold a depression that fits the upper mold surface 212; Extend, so that the glass nitrate material 50 has enough volume to achieve the effect of completely transferring the surface shape. Wherein, the width of these parts extending to both sides is, for example, d2, and d2 is smaller than d1 (as shown in FIG. 3B ). In addition, because the glass nitrate material 50 is less likely to extend to both sides, the stroke of surface shape transfer becomes shorter, and the time for friction between the upper mold 210 and the lower mold 220 and the glass nitrate material 50 is also shortened, so the service life of the mold can be increased.

Afterwards, as shown in FIG. 5C , the upper mold 210 is separated from the lower mold 220 to obtain a glass lens blank 50a with a surface shape meeting the requirement. In addition, since the glass lens blank 50a is less likely to extend to both sides, it takes less time to remove these extended portions during the core-out process (because d2 is smaller than d1).

It should be noted that in this embodiment, the flow velocity of the glass nitrate material 50 in contact with the upper mold surface 212 and the lower mold surface 224 can be controlled by changing the roughness of the upper mold surface 212 and the lower mold surface 224 . That is to say, in this embodiment, for example, multiple upper molds and lower molds with different surface roughness can be used together, or multiple upper molds and lower molds made of different materials can be used together, so that the optical lens forming mold 200a is suitable for molding glass nitrate material 50 into various glass lens blanks 50a whose surface shapes meet requirements.

second embodiment

Please refer to FIG. 6 , which is a schematic structural view of another preferred embodiment of the optical lens forming mold of the present invention. This embodiment proposes an optical lens forming mold 200 b, which is applied to the molding of an oval glass material 50 . The optical lens forming mold 200b includes an upper mold 210 and a lower mold 220 . Wherein, the upper mold 210 has an upper mold surface 212 . In addition, the lower mold 220 corresponds to the upper mold 210 to form a cavity 222 suitable for placing the glass material 50 . The lower mold 220 has a lower mold surface 224 , wherein the upper mold surface 212 and the lower mold surface 224 have different frictional forces relative to the glass nitrate material 50 .

The factors affecting the friction between the mold surface and the glass nitrate material include: the roughness of the mold surface, the material of the mold surface, and the temperature of the mold surface. In the above-mentioned optical lens forming mold 200b, the structures and reasons for the different frictional forces between the upper mold surface 212 and the lower mold surface 224 with respect to the glass material 50, for example, the frictional force of the lower mold surface 224 with respect to the glass material 50 is greater than that of the upper mold surface 212 relative to the frictional force of the glass nitrate material 50, the lower mold surface 224 is rougher than the upper mold surface 212, the upper mold surface 212 and the lower mold surface 224 are made of different materials, or the upper mold surface 212 and the lower mold surface 224 are molded on the glass nitrate material 50 When the surface temperature is different and other factors.

The control of the surface roughness of the mold has already been described in the first embodiment, so it will not be repeated here.

In this embodiment, the process of molding the elliptical glass material 50 by the optical lens forming mold 200b is similar to that described in the first embodiment, so it will not be repeated here.

It should be noted that in this embodiment, the flow of the glass nitrate material 50 in contact with the upper mold surface 212 and the lower mold surface 224 can be controlled by changing the frictional force between the upper mold surface 212 and the lower mold surface 224 relative to the glass nitrate material 50 speed. That is to say, in this embodiment, various upper molds and lower molds with different surface roughness can be used together, or multiple upper molds and lower molds made of different materials can be used together, or the upper and lower molds can be controlled during molding. The surface temperature of the lower mold is different, so that the optical lens forming mold 200b is suitable for molding the glass nitrate material 50 into a variety of glass lens blanks whose surfaces meet the requirements.

In summary, in the optical lens forming mold of the present invention, because the friction force of the upper mold surface and the lower mold surface is different with respect to the oval glass material, the speed of the glass material flowing on the upper mold surface is the same as that on the lower mold surface. The speed of the flow is different, and then a glass lens with a shape that meets the requirements is molded. Afterwards, the molded elliptical glass material can be processed to form a final optical lens.

Because the optical lens forming mold does not need to grind the elliptical glass material into a preform, the manufacturing process of the glass lens can be simplified. In addition, since the glass material is less likely to extend to both sides during molding, the glass material with a smaller volume can be used to reduce the cost of the glass material. Moreover, it takes less time to remove these portions extending to both sides during the core-taking process. In addition, since the glass material is less likely to extend to both sides, the transfer stroke of the surface shape is smaller, and the friction time between the mold and the glass material is shorter, so the time for surface shape transfer can be reduced and the service life of the mold can be increased.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all the content that does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence still belong to the scope of the technical solution of the present invention.

Claims (14)

1, a kind of optical lens forming die is applied to the mould model of a material to be formed, it is characterized in that this optical lens forming die comprises:

One first mould has first die surface that protrudes; And

One second mould, to second die surface of should first mould and having a depression, this second mould is provided with a die cavity, provides placement this material to be formed, and wherein this first die surface is different with the surfaceness of this second die surface.

2, optical lens forming die according to claim 1 is characterized in that wherein said second die surface is coarse than this first die surface.

3, optical lens forming die according to claim 1, the roughness that it is characterized in that wherein said second die surface is 15～20 microns, and the roughness of this first die surface is 0.1～0.7 micron.

4, optical lens forming die according to claim 1, it is characterized in that wherein said first with this second die surface be to carry out polished finish with diamond dust, and the particle diameter that polishes the diamond dust of this second die surface is to polish this first die surface for thick.

5, optical lens forming die according to claim 1 is characterized in that wherein said first die surface and this second die surface are to be unlike material.

6, optical lens forming die according to claim 1, it is characterized in that wherein said material to be formed be glass and polymer one of them.

7, a kind of optical lens forming die is applied to the mould model of a material to be formed, it is characterized in that this optical lens forming die comprises:

One first mould has first die surface that protrudes; And

One second mould, to second die surface of should first mould and having a depression, this second mould is provided with a die cavity, provides placement this material to be formed, and wherein this first die surface is different with respect to the frictional force of this material to be formed with this second die surface.

8, optical lens forming die according to claim 7, it is characterized in that wherein said second die surface with respect to the frictional force of this material to be formed greater than the frictional force of this first die surface with respect to this material to be formed.

9, optical lens forming die according to claim 7 is characterized in that wherein said second die surface is coarse than this first die surface.

10, optical lens forming die according to claim 7 is characterized in that wherein said first die surface and this second die surface are to be unlike material.

11, optical lens forming die according to claim 7 is characterized in that wherein said first die surface and this second die surface surface temperature when this forming materials to be formed is different.

12, optical lens forming die according to claim 7, the roughness that it is characterized in that wherein said second die surface is 15～20 microns, and the roughness of this first die surface is 0.1～0.7 micron.

13, optical lens forming die according to claim 7, it is characterized in that wherein said first with this second die surface be to carry out polished finish with diamond dust, and the particle diameter that is used to polish the diamond dust of this second die surface is to polish this first die surface person for thick.

14, optical lens forming die according to claim 7, it is characterized in that wherein said material to be formed be glass and polymer one of them.

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