CN114890656B - Optical lens molding method - Google Patents
Optical lens molding method Download PDFInfo
- Publication number
- CN114890656B CN114890656B CN202210406213.9A CN202210406213A CN114890656B CN 114890656 B CN114890656 B CN 114890656B CN 202210406213 A CN202210406213 A CN 202210406213A CN 114890656 B CN114890656 B CN 114890656B
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- CN
- China
- Prior art keywords
- die
- gasket
- glass
- lower die
- upper die
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/06—Construction of plunger or mould
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
- C03B11/084—Construction of plunger or mould for making solid articles, e.g. lenses material composition or material properties of press dies therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/0013—Re-forming shaped glass by pressing
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/0093—Tools and machines specially adapted for re-forming shaped glass articles in general, e.g. chucks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The method comprises the steps of arranging an upper die and a lower die, wherein the center positions of the upper die and the lower die are respectively provided with a pit, one surface of the upper die or the lower die is provided with a silicon carbide or tungsten carbide gasket, the size of the gasket is similar to that of the lower surface of the upper die or the upper surface of the lower die, a cylindrical through hole is arranged in the center position of the gasket, and the diameter of the circular through hole is not smaller than that of the opposite pit of the upper die or the pit of the lower die; the upper die and the lower die are made of monocrystalline silicon materials with graphene-like coatings. By adopting the method, the pressure of glass to the surface structure, particularly the edge structure, of the silicon mold in the molding process is reduced, so that the service life of the mold is further prolonged, and the cost is effectively reduced.
Description
Technical Field
The present invention relates to a method for manufacturing an optical lens, and more particularly, to a method for manufacturing an optical lens by molding an optical lens by adding a spacer.
Background
The global optical lens shipment is predicted to increase from 68.7 to 120 hundred million from 2020-2025 according to the report of the prospective industry institute, and the annual compound growth rate is 11.8%. The TSR predicts that the market size of global optics will increase from 46.44 to $79.05 billion in 2016-2021 with a annual compound growth rate of 11.2%. The sales volume and market scale of the global optical lens steadily increase, wherein three fields of mobile phones, security monitoring and vehicle-mounted cameras occupy the vast majority of the current market.
In these lens markets, the development weight of upstream optical lens manufacturers is mainly focused on three directions of special resin materials, glass molded aspherical lenses and multilayer coating due to the strong competition of downstream markets in terms of price, so as to further improve the quality of optical lenses and compress the cost of optical systems.
The heating method of the existing optical element lens compression molding equipment generally adopts a die direct heating method and an infrared heating method. The method has the advantages that the time required for heating and radiating is long, and complex elements are heated unevenly in the mould; the infrared heating device is complex in structure, large in size and needs to be fixed, the processing adaptability to optical elements with different sizes is poor, the energy utilization rate is low, the optical elements are heated unevenly, meanwhile, an infrared heating lamp is easy to damage, and the whole service life of the device is short.
A relatively high moldable temperature is required in order to expand the variety of glass raw materials, i.e., more varieties of glass can be used as raw materials, thereby reducing the cost of the glass lens hot press process.
Disclosure of Invention
The invention aims to provide a molding method of an optical lens, in particular to a preparation method for molding the optical lens by adding a gasket.
The invention provides a mould pressing preparation method of an optical lens, which comprises the following steps: the method comprises the steps of arranging an upper die and a lower die, wherein pits are respectively arranged in the central positions of the upper die and the lower die, a silicon carbide or tungsten carbide gasket is arranged on one surface of the upper die or the lower die, the size of the gasket is similar to that of the lower surface of the upper die or the upper surface of the lower die, a cylindrical through hole is formed in the central position of the gasket, and the diameter of the circular through hole is not smaller than that of the corresponding pit of the upper die or the pit of the lower die; the upper die and the lower die are made of monocrystalline silicon materials with graphene-like coatings; placing a glass product to be pressed below the upper die lower gasket or above the lower die upper gasket; heating and pressing the glass product to be pressed; when the glass product to be pressed is deformed under pressure, the glass product to be pressed is firstly extruded to the silicon carbide or tungsten carbide gasket, and then enters the structure of the monocrystalline silicon die; and cooling the upper die and the lower die, and demolding to generate the optical lens.
In another aspect of the present invention, the glass product to be pressed is glass ball, and is borosilicate glass, silicate glass, phosphoric acid glass, lanthanide glass optical glass material; wherein the silicon carbide or tungsten carbide gasket and the surface structure of the upper die or the lower die form a flying saucer type pit structure; in the pressing process, as the silicon carbide or tungsten carbide gasket material is harder than the upper die or the lower die prepared from the monocrystalline silicon material, the edges of the upper die and the lower die can be effectively prevented from being cracked in repeated use.
By adopting the mould pressing method, the pressure of glass to the surface structure of the silicon mould, particularly the edge structure, in the mould pressing process is reduced, so that the service life of the mould is further prolonged, and the cost is effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below. It will be apparent to those skilled in the art that the drawings in the following description are merely examples of the invention and that other drawings may be derived from them without undue burden to those skilled in the art.
FIG. 1 is a schematic diagram showing a pressing step in the compression molding method of the present invention.
Fig. 2 is an enlarged cross-sectional view of upper and lower molds in a molding method of the prior art.
Fig. 3 is an enlarged cross-sectional view of the lower die and a top view of the gasket after the step of adding the gasket in the compression molding method of the present invention.
Fig. 4 is a cross-sectional view of a lower mold that does not include shims.
Fig. 5 is a cross-sectional view of one embodiment of a lower die of the present invention including a gasket.
Detailed Description
Specific embodiments of the present invention will now be described with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The terminology used in the detailed description of the embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention.
FIG. 1 is a schematic diagram showing a pressing step in the compression molding method of the present invention. The press molding method of the present invention includes a step of placing a glass product to be pressed, such as glass beads 103, on a lower mold 102, and the type of glass that can be used is not particularly limited, and known glass can be selected and used according to the application. For example, an optical glass such as borosilicate glass, silicate glass, phosphate glass, or lanthanoid glass. A silicon carbide or tungsten carbide shim is placed over the lower mold 102. And detecting the difference between the positions of the lower die and the silicon carbide or tungsten carbide gasket by a secondary element detector, and ensuring concentricity of the silicon carbide or tungsten carbide gasket and the lower die by manually adjusting a clamp. After the cavity where the upper die and the lower die are located is closed and vacuumized, a motor (not shown) drives the lower die 102 to rise, the lower die 102 is heated by voltage, heat is transferred to the glass ball 103, and the temperature of the glass ball 103 rises to the glass transition temperature (Tg) and above; after the specified temperature is reached, the upper die and the lower die start to be closed, and the glass is softened at the specified temperature and extruded by the closing pressure of the upper die and the lower die; a pressing step, wherein the motor continuously drives the lower die 102 to ascend and simultaneously carries the glass ball 103 to displace, so that the glass ball 103 contacts the upper die 101, and the pressing process is completed; at this time, the glass ball 103 is deformed, and the stress at the position of the hole position edge on the gasket is the greatest, and then the glass ball is gradually filled into the whole upper and lower die structures along with the further deformation of the glass.
Annealing and cooling, namely performing slow annealing treatment, and performing primary annealing treatment on the formed lens in a forming die so as to release internal stress; taking the annealed molded lens out of the molding die, and placing the molded lens on a cooling disc to be independently cooled to room temperature; and a mold-taking step of taking out the cooled compression molded product from the upper mold 101 and the lower mold 102.
The upper mold 101 and the lower mold 102 are both monocrystalline silicon material with a graphene-like coating.
Fig. 2 is an enlarged cross-sectional view of upper and lower molds in a molding method of the prior art. Because the traditional process adopts monocrystalline silicon material as the material of the upper die and the lower die and adopts monocrystalline silicon material as the die, when the monocrystalline silicon is repeatedly pressed during mass production, the maximum stress area of the die, namely the inner structure edge 201 and the bottom of the die, is damaged when the pressure of the monocrystalline silicon becomes larger due to a certain molding frequency or occasionally insufficient heating of glass and exceeds the force born by the monocrystalline silicon material at high temperature, and the service life of the die is shortened. In the molding process, the diameter of the glass ball is larger than or equal to the surface structure of the mold, so that the edge 201 of the mold structure is pressed first during the molding process, and this local position is stressed more, and is easily damaged.
Fig. 3 is an enlarged cross-sectional view of the lower die and a top view of the gasket after the step of adding the gasket in the compression molding method of the present invention. As can be seen from the enlarged view of the lower mold in fig. 2, the lower mold 102 of the present invention has a dimple 301 at the center, which may be in the shape of a spherical cap; the method aims at facilitating the production of lenses with various shapes, so that the shapes of the pits on the upper die and the lower die are not necessarily completely corresponding, and only the preparation requirement of the lenses can be met. In the molding method adopted by the invention, before the step of placing the glass ball 103, a corresponding silicon carbide gasket 302 is placed on the lower mold, the size of the gasket 302 is similar to the upper surface of the lower mold, and a cylindrical through hole is formed in the center position. The diameter of the circular through hole is not smaller than the diameter of the lower die pit. Corresponding to the edges protecting the pressed position of the mould core. In the pressing step, after the glass ball is pressed and deformed, the glass ball is firstly extruded to silicon carbide or silicon carbide chips, and then the glass ball enters the structure of the monocrystalline silicon die, and at the moment, the hardness of the silicon carbide or tungsten carbide gasket is higher than that of the monocrystalline silicon die, so that the upper die and the lower die are not easy to crack in the repeated die pressing process, and the service life of the die is prolonged.
The mould pressing method adopted by the invention provides gasket protection for one of the upper mould and the lower mould which is more vulnerable. In one embodiment of the present invention, the molding method is a method that a lower mold gradually rises to drive the glass ball to approach an upper mold, so that in general, the gasket 302 is placed on the lower mold in the process of manufacturing the glass lens, so that the service life of the upper and lower molds can be prolonged. One of ordinary skill in the art can choose to place the gasket under the upper mold or over the lower mold depending on the movement of the upper and lower molds, the size of the lens to be prepared, and the size of the upper and lower molds in the actual production process.
Fig. 4 is a cross-sectional view of a lower mold that does not include shims. Fig. 5 is a cross-sectional view of one embodiment of a lower die of the present invention including a gasket. As can be seen from fig. 4, the pit structure of the lower die surface is a flying saucer-shaped pit, first a cylindrical pit having a depth of 0.5015mm and a diameter of 4.0120mm. Then a circular arc shaped pit with a radius of 2.8094mm is located at the center of the mold. As shown in fig. 5, a silicon carbide or tungsten carbide pad 302 with a diameter of 4.0120mm round hole was placed on the monocrystalline silicon lower die 102, and the surface structure of the silicon carbide or tungsten carbide pad 302 and the monocrystalline silicon lower die 102 was exactly the same as the structure of the flying saucer-shaped pit in fig. 4. During mould pressing, the structural edges (at the points a and b) of the mould surface bear larger stress, but as the silicon carbide or tungsten carbide gasket material is harder than the monocrystalline silicon lower mould 102, the fracture of the position can be effectively avoided in repeated use, so that the aim of protecting the surface structure of the monocrystalline silicon mould from being damaged is fulfilled, namely the service life of the monocrystalline silicon lower mould is prolonged.
In the mould pressing process, the upper edge of the cylindrical pit and the edge of the circular arc pit are easy to damage, so that the cylindrical pit is replaced by manufacturing a gasket by using silicon carbide or tungsten carbide materials, and when glass in the mould pressing process is deformed, the harder gasket is extruded first, so that the damage to the structural edge of the monocrystalline silicon mould caused by the concentrated and oversized stress is avoided, and finally the use times of the mould is prolonged, namely the service life of the mould is prolonged.
The invention has the advantage of greatly reducing the production cost. The material cost of the monocrystalline silicon upper and lower dies is several tenth of that of the traditional upper and lower dies, and the surface type error of the structure is in submicron level due to the very high precision required by processing the surface structure, and the surface roughness error of the structure is in nanometer level, so that the cost is reduced by several times on the premise of ensuring enough precision by adopting silicon carbide or a silicon carbide gasket. In addition, because silicon carbide or tungsten carbide materials are much harder than single crystal silicon, damage to the edge locations of the structures on the mold is avoided by using shims, which ultimately can increase the service life of the mold several times. The number of times of using the mould is increased, and the cost of the pressed lens can be further reduced, so that the mould is more competitive.
Reference herein to "one embodiment," "an embodiment," or "one or more embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Furthermore, it is noted that the word examples "in one embodiment" herein do not necessarily all refer to the same embodiment.
The above description is only for the purpose of illustrating the technical solution of the present invention, and any person skilled in the art may modify and change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, the protection scope of the invention should be considered as the scope of the claims. The invention has been described above with reference to examples. However, other embodiments than the above described are equally possible within the scope of the disclosure. The different features and steps of the invention may be combined in other ways than those described. The scope of the invention is limited only by the appended claims. More generally, one of ordinary skill in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the teachings of the present invention are used.
Claims (3)
1. A method for the compression molding preparation of an optical lens comprising the steps of:
the method comprises the steps of arranging an upper die and a lower die, wherein pits are respectively arranged in the central positions of the upper die and the lower die, a silicon carbide or tungsten carbide gasket is arranged on one surface of the upper die or the lower die, the size of the gasket is similar to that of the lower surface of the upper die or the upper surface of the lower die, a cylindrical through hole is formed in the central position of the gasket, and the diameter of the circular through hole is not smaller than that of the corresponding pit of the upper die or the pit of the lower die; the upper die and the lower die are made of monocrystalline silicon materials with graphene-like coatings;
placing a glass product to be pressed below the upper die lower gasket or above the lower die upper gasket; heating and pressing the glass product to be pressed; when the glass product to be pressed is deformed under pressure, the glass product to be pressed is firstly extruded to the silicon carbide or tungsten carbide gasket, and then enters the structure of the monocrystalline silicon die; and cooling the upper die and the lower die, and demolding to generate the optical lens.
2. The press molding method according to claim 1, wherein the glass article to be pressed is a glass sphere, and is borosilicate glass, silicate glass, phosphate glass, or lanthanoid glass optical glass material.
3. The molding preparation method of claim 1, wherein the silicon carbide or tungsten carbide gasket and the surface structure of the upper mold or the lower mold form a flying saucer-shaped pit structure; in the pressing process, as the silicon carbide or tungsten carbide gasket material is harder than the upper die or the lower die prepared from the monocrystalline silicon material, the edges of the upper die and the lower die can be effectively prevented from being cracked in repeated use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210406213.9A CN114890656B (en) | 2022-04-18 | 2022-04-18 | Optical lens molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210406213.9A CN114890656B (en) | 2022-04-18 | 2022-04-18 | Optical lens molding method |
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| Publication Number | Publication Date |
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| CN114890656A CN114890656A (en) | 2022-08-12 |
| CN114890656B true CN114890656B (en) | 2023-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210406213.9A Active CN114890656B (en) | 2022-04-18 | 2022-04-18 | Optical lens molding method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003146672A (en) * | 2001-11-07 | 2003-05-21 | Matsushita Electric Ind Co Ltd | Substrate molding apparatus and middle die for molding |
| JP2004277242A (en) * | 2003-03-17 | 2004-10-07 | Matsushita Electric Ind Co Ltd | Optical element molding die, method and apparatus |
| CN2693763Y (en) * | 2004-03-13 | 2005-04-20 | 鸿富锦精密工业（深圳）有限公司 | Glass modeling device |
| CN1824618A (en) * | 2005-02-24 | 2006-08-30 | 株式会社茉莉特斯 | Molded glass lens with a lens holding cylinder integrated, and a production device thereof |
| CN102264654A (en) * | 2008-11-25 | 2011-11-30 | 康宁股份有限公司 | Apparatus and method of forming shaped article from sheet of glass |
| CN113651522A (en) * | 2021-09-14 | 2021-11-16 | 李莉华 | Non-isothermal glass molding method |
-
2022
- 2022-04-18 CN CN202210406213.9A patent/CN114890656B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003146672A (en) * | 2001-11-07 | 2003-05-21 | Matsushita Electric Ind Co Ltd | Substrate molding apparatus and middle die for molding |
| JP2004277242A (en) * | 2003-03-17 | 2004-10-07 | Matsushita Electric Ind Co Ltd | Optical element molding die, method and apparatus |
| CN2693763Y (en) * | 2004-03-13 | 2005-04-20 | 鸿富锦精密工业（深圳）有限公司 | Glass modeling device |
| CN1824618A (en) * | 2005-02-24 | 2006-08-30 | 株式会社茉莉特斯 | Molded glass lens with a lens holding cylinder integrated, and a production device thereof |
| CN102264654A (en) * | 2008-11-25 | 2011-11-30 | 康宁股份有限公司 | Apparatus and method of forming shaped article from sheet of glass |
| CN113651522A (en) * | 2021-09-14 | 2021-11-16 | 李莉华 | Non-isothermal glass molding method |
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| Publication number | Publication date |
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| CN114890656A (en) | 2022-08-12 |
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