Method and device for mold pressing manufacturing and surface treatment of coated glass lens simultaneously

Abstract

The invention belongs to the technical field of glass surface treatment and coated glass lens precision manufacturing, and particularly relates to a method and device for mold pressing manufacturing and surface treatment of a coated glass lens. The method is applied to a heating stage of glass lens mold pressing, in the stage, heating and surface treatment are simultaneously carried out on a glass prefabricated part so as to ensure that components on the glass surface are kept stable, surface defects of the molded glass lens are inhibited, and when the glass prefabricated part is heated, the optical surface of the glass prefabricated part does not make contact with the inner surface of a mold cavity of a mold; according to the surface treatment, the optical surface of the glass prefabricated part is exposed in a specific gas atmosphere, and the gas is used for reducing the temperature of the surface of the glass and taking away part of unstable substances on the surface through flowing. According to the invention, the surface state of the glass prefabricated part is improved, the heating mode of the glass prefabricated part is optimized, and long-time contact between the glass and the mold is avoided, so that the problems of surface defects of molded glass and poor coating quality are solved, and the surface quality and yield of the coated glass lens are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of glass surface treatment and precision manufacturing of coated glass lenses, and in particular to a method and device for simultaneous surface treatment of coated glass lenses during molding and manufacturing. Background Art

[0002] Optical glass is a fundamental material for the manufacture of various optical components. With its excellent optical and thermodynamic properties, it is widely used in the processing of various substrates, lenses, and mirrors. In recent years, as optical products have increasingly demanded higher levels of system integration and performance, the shapes of glass optical components have become increasingly complex to meet requirements such as aberration correction, light field manipulation, and expanded field of view. For example, aspheric surfaces, free-form surfaces, diffractive structures, and microlens arrays are widely used in virtual reality (VR) / augmented reality (AR) devices, projectors, and lidar.

[0003] Traditional milling, grinding and polishing techniques are widely used for batch processing of high-precision spherical glass lenses, but for glass lenses with complex shapes, the processing efficiency is low. Therefore, this type of glass lens is generally processed in batches using precision compression molding technology. The precision compression molding process steps can be divided into: heating (including preheating and soaking), molding, cooling (including annealing and rapid cooling) and demolding. Specifically, the temperature is first raised to above the glass transition temperature Tg to soften the glass preform, and the internal temperature of the glass is made uniform by soaking and heat preservation; then, under a certain pressure, the glass is deformed to fill the mold cavity and replicate the surface shape of the mold; finally, the optical lens is obtained after cooling and demolding. This method has a high processing efficiency and is suitable for batch processing of complex-shaped glass lenses made of materials such as low-melting-point glass and quartz glass.

[0004] Glass optical surfaces require specific coatings to achieve the desired optical properties. Coating processes typically include physical vapor deposition (PVD), chemical vapor deposition (CVD), and atomic layer deposition (ALD). Common coating types vary depending on the optical properties: Surfaces with transmissive properties are typically coated with anti-reflective layers composed of magnesium fluoride and metal oxides to achieve high transmittance within specific wavelengths; surfaces with optical functions such as filtering and polarization are treated with specialized coatings that can control light; and surfaces with waterproof and scratch-resistant properties are coated as needed with waterproof or high-hardness materials. Despite their varying functions, these coatings all require strong adhesion to the glass substrate to ensure longevity. This adhesion is generally considered to be closely related to the glass material, coating material, surface condition of the glass substrate, and the coating process.

[0005] However, molded glass lenses often exhibit surface defects such as sticky spots, pitting, and blurred spots. These defects severely reduce the bond strength between the glass and the film layer, and can even cause partial film shedding or failure to coat the film, severely impacting the yield rate of coated glass lenses. These defects are generally believed to be caused by physical adhesion and chemical reactions at the glass-mold interface. This is particularly true for glass materials containing unstable components, such as chalcogenide glass and fluor-crown glass. Under high temperature conditions, these unstable components can easily evaporate from the glass surface, causing defects at the glass-mold interface.

[0006] Currently, glass preforms without any surface treatment are generally used directly in the glass molding process. During the entire process cycle, the optical surface of the glass is always in close contact with the mold cavity, which easily induces volatiles to be produced on the glass surface and retained at the contact interface, eventually forming surface defects.

[0007] Japanese Patent Laid-Open No. 9-71424 (JP, 09-071424, A) discloses a method of heating glass raw materials to a viscosity of 10 before forming. 9 -10 14 Poise is equivalent to the temperature and the air pressure is below 10 3 Pa, the glass is subjected to high temperature volatilization heat treatment, and then the glass is heated to a viscosity of 10 5 -10 7 Poise is a temperature that is quite high, and the glass is quickly molded. On the one hand, this method requires an additional high-temperature treatment process before the glass is formed, and the treatment time is as long as several hours, which makes the processing efficiency low. At the same time, this process is also prone to defects such as dirt on the optical surface of the glass. On the other hand, this method requires that the glass be heated to a relatively high temperature (much higher than the softening point of the glass) when it is formed. However, in the actual production process, in order to extend the service life of the mold, the heating temperature should be as low as possible below the softening point of the glass. In addition, higher temperatures will also bring defects such as glass sticking to the mold and sticky spots on the glass surface. Therefore, this method still has many practical problems to be solved.

[0008] Japanese Patent Application Laid-Open No. 2014-24741 (JP, 2014-24741, A) addresses surface defects in molded phosphate glass and discloses a process for polishing a molded optical component using zirconium oxide abrasives, etc., to remove the surface alteration layer. This eliminates the surface defect layer and meets subsequent coating requirements. However, the polishing process can easily affect the surface accuracy of the optical component and easily introduce new scratches, abrasive residue, and other defects on the optical surface. Therefore, strict and precise control of the polishing process is required, significantly reducing the production efficiency of optical components. Therefore, this method still has certain limitations in mass production.

[0009] At present, there are no more new methods and processes developed specifically to address this type of coated glass molded surface defect problem in public reports. Therefore, there is an urgent need for a method and technology that can suppress glass lens surface defects to improve the surface quality of coated glass lens molding and the yield rate of coating. Summary of the Invention

[0010] The purpose of the present invention is to overcome the shortcomings of the prior art, carry out surface stabilization treatment on a glass preform at a relatively low temperature, and provide a method and apparatus for simultaneous surface treatment during molding and manufacturing of a coated glass lens.

[0011] In the glass molding process, glass preforms are usually made of spherical parts with high precision and high surface quality. Before molding, the clean glass preform is placed in the mold, and the spherical surface of the glass is in direct contact with the mold, which not only realizes the initial positioning of the glass preform, but also can use this contact surface to realize heat exchange between the mold and the glass. However, for some glass materials, a large number of defects such as sticky spots, pitting, and blurred spots appear on the surface after molding, making it difficult to meet the appearance standard requirements of subsequent coating, which in turn leads to poor quality of glass surface coating or even inability to be plated. The applicant found that the areas where defects on the glass surface occur are mostly interfaces where the glass and the mold are in contact for a long time, and most of these glass materials contain high-temperature unstable components, which are easily volatilized through the glass surface after heating. These volatiles fail to escape effectively in the contact area between the glass and the mold and remain on the surface, thus causing surface defects in this area.

[0012] The method and apparatus of the present invention are applied to the heating stage of glass lens molding. During this stage, the glass preform is simultaneously heated and surface-treated to ensure that the glass surface composition remains stable and to suppress the formation of surface defects in the molded glass lens. When heating the glass preform, the optical surface of the glass preform is kept out of contact with the inner surface of the mold cavity. The surface treatment involves exposing the optical surface of the glass preform to a specific gas atmosphere. The gas is used to reduce the glass surface temperature and remove unstable substances on the surface through its flow.

[0013] Furthermore, the non-contact is achieved by arranging a retaining ring component of the glass preform inside the mold.

[0014] Furthermore, the heating method is to implement contact heat transfer to the glass preform through the retaining ring component. Specifically, contact heat transfer to the mold is achieved by installing a heating plate outside the mold, or non-contact radiative heat transfer is achieved by installing an infrared heater outside the mold. Furthermore, the retaining ring component can be heated by contact with the mold or radiative heat transfer, thereby achieving contact heating of the glass preform. The advantage of this heating method is that it avoids prolonged contact between the optical surface of the glass and the mold.

[0015] Furthermore, a retaining ring is assembled inside the mold, in close contact with the non-optical surface of the glass preform to position and clamp the glass preform. The retaining ring separates the optical surface of the glass preform from the inner surface of the mold cavity and maintains this separation until heating is completed. After heating, the retaining ring releases the glass preform into the mold cavity, and the molding process begins.

[0016] Furthermore, the retaining ring releases the glass preform synchronously with the closing of the mold. The retaining ring releases the glass preform in the following ways: the retaining ring spontaneously separates under external control, or a specific structure inside the mold expands the retaining ring to separate it.

[0017] Glass surface treatment involves exposing the optical surface of the glass to a specific flowing gas atmosphere, at a temperature several tens of degrees below the glass's heating temperature, preferably 20-30°C. This gas not only lowers the glass's surface temperature but also removes unstable surface substances through its flow. Depending on the unstable surface components of different glass materials, a different gas atmosphere is selected, either a single gas or a combination of gases. Specifically, because the retaining ring component already separates the optical surface of the glass preform from the mold surface, the desired gas can be introduced directly into the heating chamber of the molding press, ensuring that the mold is immersed in the gas atmosphere.

[0018] Furthermore, the single gas is an inert gas. When the unstable substance on the glass surface has low-temperature stability, the single gas is used for treatment to reduce the glass surface temperature through gas flow, thereby maintaining the stability of the physical and chemical properties of the glass surface.

[0019] Furthermore, the composite gas includes an inert gas and a gas that reacts with unstable substances on the glass surface. When the unstable substances on the glass surface do not have low-temperature stability, the composite gas is used for treatment to transfer the unstable substances on the glass surface into the gas, thereby efficiently achieving glass surface stabilization treatment.

[0020] Furthermore, the gas pressure, temperature and flow rate are adjusted according to the surface treatment requirements of the glass material to achieve the optimal surface treatment effect.

[0021] The present invention achieves the following beneficial technical effects:

[0022] 1. The present invention provides a method and device for contactless heating of glass optical surfaces and simultaneous surface treatment. During the heating stage, the glass preform conducts heat transfer based on its non-optical surface, while its optical surface is separated from the mold surface and fully exposed to a specific flowing gas atmosphere for low-temperature stabilization treatment, and then is subjected to mold forming, thereby effectively suppressing defects caused by volatiles on the glass surface. In existing glass molding methods, the glass optical surface always maintains close contact with the mold surface throughout the entire process cycle, and does not have the conditions for surface treatment of unstable glass materials. At the same time, the mold structure itself cannot achieve contactless heating and surface treatment of the glass optical surface, so it is easy to cause surface defects in molded glass lenses and reduce the coating quality. The method and device for simultaneous surface treatment of coated glass lenses proposed by the present invention cleverly utilize contactless heating of the glass optical surface and flowing gas atmosphere surface treatment. First, the glass surface is treated in a specific flowing gas atmosphere, which can keep the glass optical surface at a low temperature at all times, reducing the generation of volatiles. In addition, composite gas is used for surface treatment of glass materials with poor thermal stability, achieving surface stabilization, thereby solving the problem of the source of surface defects. Second, the heating method adopts non-contact heating of the glass optical surface, avoiding long-term close contact between the glass and the mold surface, and allowing the gas to flow on the glass optical surface, which not only cools the optical surface but also has the effect of taking away a small amount of volatiles that escape from the glass optical surface, reducing the problem of volatile retention caused by contact, thereby blocking the external conditions for the formation of surface defects. Third, the glass surface treatment is carried out in parallel with the heating process, achieving the effect of suppressing glass surface defects while ensuring the molding efficiency. Therefore, the method provided by the present invention provides a stable glass surface and heating conditions from the perspective of improving the glass surface state and optimizing the heating method, which can achieve the purpose of suppressing molded glass surface defects, thereby improving the yield rate of molded glass coating.

[0023] 2. The method and apparatus of the present invention are clear and well-defined, easy to implement. The glass surface treatment and non-contact heating of optical surfaces involved can be achieved by setting up a specific gas atmosphere and using specific apparatus, making them easily applicable in production. Therefore, the present invention can effectively suppress the occurrence of surface defects in molded glass lenses and is particularly suitable for use in applications involving molded lenses made of glass materials that are volatile or contain high-temperature unstable components. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 4 is a flow chart of glass lens molding according to an embodiment of the present invention.

[0025] Figure 2 Schematic diagram of a mold structure according to an embodiment of the present invention.

[0026] Figure 3Schematic diagram of heating and surface treatment of a glass preform according to an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of the structure of a retaining ring component clamping a glass preform according to an embodiment of the present invention.

[0028] Figure 5 for Figure 4 CC cross-sectional view.

[0029] Figure 6 Schematic diagram of the positioning structure of the retaining ring component according to an embodiment of the present invention.

[0030] Figure 7 for Figure 6 DD cross-sectional view.

[0031] Figure 8 This is a schematic structural diagram of a retaining ring component after releasing a glass preform according to an embodiment of the present invention.

[0032] Figure 9 Schematic diagram of completing the molding of a glass lens according to an embodiment of the present invention.

[0033] In the figure: 1 upper mold core, 2 glass preform, 3 retaining ring component, 4 positioning sleeve, 5 lower mold core, 6 guide column, 7 positioning block, 8 target lens, 3-1 upper driving mechanism, 3-2 upper semicircular ring, 3-3 lower semicircular ring, 3-4 lower driving mechanism. DETAILED DESCRIPTION

[0034] In order to further illustrate the technical content, features and implementation effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and examples.

[0035] This embodiment uses the molding process of a φ19.5mm biconvex aspheric coated lens as an example to specifically illustrate a method and apparatus for molding and simultaneously surface treating a coated glass lens. The glass material is a fluoride glass. The chemical properties of fluorine (F) vary with temperature. When heated to approximately 50°C above the glass transition temperature (Tg), fluorine becomes chemically active and begins to volatilize in large quantities. At this temperature, its chemical properties are relatively stable. The mold material is tungsten carbide. After molding, an anti-reflective coating of magnesium fluoride is applied to the optical surface of the lens using vacuum evaporation (physical vapor deposition).

[0036] The method and apparatus of the present invention are applied to the heating stage of glass lens molding. During this stage, the glass preform 2 is simultaneously heated and surface-treated to ensure that the glass surface composition remains stable and to suppress the formation of surface defects in the molded glass lens. When heating the glass preform 2, the optical surface of the glass preform 2 is kept out of contact with the inner surface of the mold cavity. The surface treatment involves exposing the optical surface of the glass preform 2 to a specific flowing gas atmosphere. The gas is used to reduce the glass surface temperature and remove unstable surface substances through the flow.

[0037] According to the method, the molding process is determined as follows Figure 1 As shown, the process includes a preparation stage, a heating stage, a molding stage, a cooling stage and a demoulding stage which are performed in sequence.

[0038] Preparation: First, assemble the glass preform 2 into the retaining ring component 3, then place the glass preform 2 and the retaining ring component 3 into the mold as a whole, finally position the retaining ring component 3, and close the mold;

[0039] Heating stage: a specific gas is introduced into the heating chamber of the molding machine, the mold is sent into the heating chamber, and the glass preform 2 is heated and surface treated at the same time;

[0040] Molding stage: the mold core moves to close the mold, and the retaining ring component 3 releases the glass preform 2 into the mold cavity. Under a given pressure, the glass preform 2 is formed into a lens;

[0041] Cooling stage: Under a given holding pressure, the mold is cooled to room temperature. When cooling, it is first slowly cooled and annealed to the glass annealing point to reduce the internal stress of the glass, and then quickly cooled to room temperature;

[0042] Demolding stage: remove the mold from the molding machine and demould the lens after the mold is opened.

[0043] After that, the lens enters the coating process, and the demoulded lens is sent to the coating machine to apply a coating layer on its optical surface.

[0044] like Figure 2As shown, based on the method and device described in the present invention, the mold is used in this embodiment to carry out biconvex aspheric lens molding. The mold is composed of an upper mold core 1 and a lower mold core 5 to form a mold cavity. The upper mold core 1 and the lower mold core 5 are both processed with concave aspheric surfaces. After the mold is closed, the glass is deformed to replicate the shape of the mold surface, and a biconvex aspheric lens can be formed. The outside of the upper mold core 1 and the lower mold core 5 is a positioning sleeve 4, which is clearance-matched with the upper mold core 1 and the lower mold core 5 to control the inter-surface eccentricity of the lens. The positioning sleeve 4 is provided with four evenly distributed air holes in the circumference facing the mold cavity, so that the mold cavity is ventilated with the external environment, so that the glass can be surface-treated in a gas atmosphere later. A retaining ring component 3 is provided between the upper mold core 1 and the lower mold core 5 for positioning and clamping the glass preform 2. The retaining ring component 3 is placed on the upper part of the lower mold core 5. There is a guide column 6 on each side of the upper mold core 1, which is connected to the upper mold core 1 by an interference fit. The end of the guide column 6 has a conical surface feature for positioning and movement. There is a reserved hole on each side of the lower mold core 5 that is clearance-fitted with the guide column 6.

[0045] The mold is used as follows: first, the glass preform 2 is loaded into the retaining ring component 3, and then the retaining ring component 3 is installed on the upper part of the lower mold core 5; then, the positioning sleeve 4 is installed on the outside of the lower mold core 5; finally, the upper mold core 1 with the guide pins 6 is placed into the positioning sleeve 4 until the end conical surfaces of the guide pins 6 contact the openings of the guide pin holes reserved on both sides of the retaining ring component 3. Because the diameter of the guide pin holes of the retaining ring component 3 is smaller than the diameter of the guide pins 6 when the glass preform 2 is clamped, the guide pins 6 are limited when contacting the openings of the guide pin holes, and the positioning of the upper mold core 1 is achieved at the same time, thereby completing the molding of the glass preform 2.

[0046] During the heating phase, when the glass preform 2 is heated, the optical surface of the glass is kept in contact with the inner surface of the mold cavity, and the non-optical surface of the glass is used as the contact surface with the mold. The non-contact is achieved by setting a retaining ring component 3 for the glass preform 2 inside and outside the mold. In this embodiment, Figure 3 As shown, the outer cylindrical surface (non-optical surface) of the glass preform 2 is clamped by the retaining ring component 3, which determines its position in the mold cavity. The optical surfaces on both sides of the glass preform 2 retain a large gap with the corresponding mold surface, avoiding long-term contact between the glass optical surface and the mold.

[0047] The heating method is to implement contact heat transfer to the glass preform 2 through the retaining ring component 3. In this embodiment, the mold is placed on a heating plate in the heating chamber of the molding machine, and heat is transferred to the upper mold core 1 and the lower mold core 5 through the heating plate. Further, the lower mold core 5 transfers heat to the retaining ring component 3, and the retaining ring component 3 then transfers heat to the glass preform 2.

[0048] Figure 4 and Figure 5The schematic diagram of the structure of the retaining ring component 3 used in this embodiment is shown, showing the structure when clamping the glass preform 2. The structure of the retaining ring component 3 is as follows: the main body is composed of an upper semicircular ring 3-2 and a lower semicircular ring 3-3. The radius of the two semicircular rings is equal and both are larger than the radius of the molded target lens 8. The axial ends of the two semicircular rings are provided with stoppers for clamping and limiting the glass preform 2. The outer sides of the upper semicircular ring 3-2 and the lower semicircular ring 3-3 are respectively provided with two upper driving mechanisms 3-1 and two lower driving mechanisms 3-4. One side of the driving mechanism is a driving end ( Figure 4 The driving ends of the upper driving mechanism 3-1 and the lower driving mechanism 3-4 are connected to the holes reserved for them on both sides of the upper semicircular ring 3-2 and the lower semicircular ring 3-3 respectively, and the connection method is interference fit, as shown in FIG. Figure 5 When working, the driving ends of the upper driving mechanism 3-1 and the lower driving mechanism 3-4 move, respectively exerting forces on the upper semicircular ring 3-2 and the lower semicircular ring 3-3 to control the movement of the upper semicircular ring 3-2 and the lower semicircular ring 3-3.

[0049] The retaining ring component 3 is located between the upper mold core 1 and the lower mold core 5 and is assembled on the upper part of the lower mold core 5. Figure 6-Figure 7 As shown, four positioning blocks 7 are assembled on the upper part of the lower mold core 5, with two on each side of the mold core. The end face of the upper part of the lower mold core 5 has four corresponding positioning grooves, and the positioning blocks 7 are respectively embedded in the positioning grooves through interference fit to achieve the connection between the two. The assembly of the positioning blocks 7 is completed before the mold is assembled. The positioning block 7 has a semi-cylindrical groove and a single-sided stop. The opening side of the semi-cylindrical groove faces the fixed end of each drive mechanism, and its size is consistent with the size of the fixed end of the drive mechanism. The fixed ends of the two upper drive mechanisms 3-1 and the two lower drive mechanisms 3-4 are respectively installed in the semi-cylindrical groove, and the position of each drive mechanism is limited by the stop. Therefore, when the retaining ring component 3 is assembled, it is only necessary to align the fixed ends of the upper drive mechanism 3-1 and the lower drive mechanism 3-4 with the positioning blocks 7 to achieve rapid positioning and assembly.

[0050] The operating principle of the retaining ring assembly 3 in this embodiment is as follows: During the heating and glass surface treatment process, the retaining ring assembly 3 is mounted on the exterior of the outer cylindrical surface of the glass preform 2. Driven toward each other by the upper drive mechanism 3-1 and the lower drive mechanism 3-4, the upper semi-circular ring 3-2 and the lower semi-circular ring 3-3 consistently position and clamp the glass preform 2, while keeping the optical surface of the glass preform 2 separated from the inner surface of the mold cavity. This state is maintained until the heating is completed. After the heating and surface treatment are completed, the upper mold core 1 moves downward under external pressure to close the mold, and the glass preform 2 is released into the mold cavity.

[0051] The manner in which the retaining ring component 3 releases the glass preform 2 includes: the retaining ring component 3 spontaneously separates through external control, and a specific structure is provided inside the mold to expand the retaining ring component 3 to separate it. In this embodiment, a guide post 6 is used to expand the retaining ring component 3. The guide post 6 moves downward and enters the guide post holes reserved on both sides of the retaining ring component 3. The guide post holes formed by the upper semicircular ring 3-2 and the lower semicircular ring 3-3 expand, exerting a force to separate the two semicircular rings from each other. Since the upper semicircular ring 3-2 and the lower semicircular ring 3-3 have an interference fit with the driving ends of the upper driving mechanism 3-1 and the lower driving mechanism 3-4, the driving ends of the upper driving mechanism 3-1 and the lower driving mechanism 3-4 begin to retract after being subjected to the force. The upper driving mechanism 3-1 and the lower driving mechanism 3-4 move in opposite directions to separate the upper semicircular ring 3-2 and the lower semicircular ring 3-3 from each other, and no longer maintain the clamping state of the glass preform 2. The glass preform 2 is released into the lower mold core 5. Thereafter, as Figure 8 As shown, the retaining ring component 3 will always keep the upper semi-circular ring 3-2 and the lower semi-circular ring 3-3 in a separated state until the process is completed.

[0052] The surface treatment principle for the glass preform 2 involves exposing the optical surface of the glass preform 2 to a specific gas atmosphere, with the gas temperature several tens of degrees below the glass heating temperature, preferably 20-30°C. This gas not only lowers the glass surface temperature but also removes unstable substances from the surface through its flow. Depending on the unstable surface components of different glass materials, a different gas atmosphere is selected, either a single gas or a composite gas. Specifically, since the retaining ring 3 already separates the optical surface of the glass preform 2 from the mold surface, the desired gas can be introduced directly into the heating chamber of the molding press, ensuring that the mold is immersed in the gas atmosphere.

[0053] The single gas is an inert gas, including but not limited to nitrogen and argon. When the unstable substance on the glass surface has low-temperature stability, the single gas is used for treatment to reduce the glass surface temperature through gas flow and maintain the stability of the physical and chemical properties of the glass surface.

[0054] The composite gas includes an inert gas and a gas that reacts with unstable substances on the glass surface. When the unstable substances on the glass surface do not have low-temperature stability, the composite gas is used for treatment to transfer the unstable substances on the glass surface into the gas, thereby efficiently achieving glass surface stabilization treatment.

[0055] Furthermore, the gas pressure, temperature and flow rate are adjusted according to the surface treatment requirements of the glass material to achieve the optimal surface treatment effect.

[0056] In this embodiment, since the material of the glass preform 2 is chemically more active at high temperatures and more stable at low temperatures, it is not necessary to use a specific composite gas for surface treatment, and a single gas can be used.

[0057] In this embodiment, the specific implementation of the surface treatment is as follows: the heating temperature of the glass material is set to T1, preferably, T1 is set to 50-70°C higher than the glass transition temperature Tg, at which temperature the glass is easily formed under the action of external pressure; the gas is selected to be nitrogen, and the temperature is set to T2, preferably, T2 is set to 20-30°C lower than the heating temperature T1, at which temperature the volatility of fluorine on the glass surface is significantly reduced, and when the temperature is higher than T2, the volatility of fluorine becomes stronger as the temperature rises. Figure 3 As shown, during surface treatment, nitrogen is introduced into the heating chamber of the molding press. The heating chamber is equipped with an air inlet and an air outlet, with the mold positioned between the two inlets. Nitrogen flows from the air inlet to the air outlet within the heating chamber, and the gas pressure within the heating chamber is set to atmospheric pressure. Since the retaining ring component 3 ensures that the optical surface of the glass preform 2 is completely separated from the mold surface, the optical surface of the glass preform 2 can be completely blown by the flowing nitrogen. Due to the poor thermal conductivity of glass, within the limited treatment time (preferably 100-200 seconds), the flowing nitrogen can only remove heat from the glass surface, reducing the glass surface temperature to near T2, while the glass core temperature remains at T1.

[0058] Therefore, the above embodiment achieves the following effects: the glass surface temperature is lower than the glass core temperature. The lower glass surface temperature reduces the generation of fluorine volatiles, while the higher glass core temperature ensures that the glass preform can be easily deformed during the molding process. Furthermore, even if a small amount of fluorine volatiles is generated near the glass surface, they are promptly blown away by the flowing nitrogen gas, preventing the glass surface from accumulating high concentrations of fluorine volatiles and potentially causing defects. Therefore, the surface treatment of this embodiment achieves the effect of suppressing glass surface defects by reducing fluorine volatilization from the glass surface and removing the small amount of fluorine volatiles near the glass surface.

[0059] like Figure 1 As shown, after the glass preform 2 has been heated and surface treated, and fully insulated and heat-matched, it enters the molding process. Under external pressure, the upper mold core 1 moves downward, and the guide pins 6 pass through the retaining ring component 3 and enter the left and right reserved holes of the lower mold core 5. The glass preform 2 is compressed to replicate the mold surface shape, and the lens is formed. Figure 9 The target lens 8 after compression molding and the mold in the closed state are shown. The mold then begins to cool until it reaches room temperature and is removed from the molding machine. During demolding, the upper mold core 1 is removed, followed by the target lens 8. Furthermore, the formed target lens 8 enters the coating process, where a magnesium fluoride antireflection film is applied to its optical surface via vacuum evaporation. Thus, the compression molding process of a coated lens is completed using the method and apparatus of the present invention.

[0060] In summary, the principles and implementation methods of the method and device of the present invention have been described in conjunction with specific embodiments. The description of the above embodiments is only used to help understand the method and ideas of the present invention, and the scope of protection of the present invention is not limited thereto. Any changes made by any person skilled in the art based on the method and technical route of the present invention by simple modifications, equivalent conversions, etc. should be covered within the scope of protection of the present invention.

Claims

1. A method and apparatus for simultaneous surface treatment of a coated glass lens during molding, characterized in that: The invention is applied to the heating stage of glass lens molding, in which the glass preform (2) is heated and surface-treated simultaneously. When the glass preform (2) is heated, the optical surface of the glass preform (2) is prevented from contacting the inner surface of the mold cavity by a retaining ring component (3). The surface treatment is to expose the optical surface of the glass preform (2) to a flowing gas atmosphere.

2. The method according to claim 1, characterized in that The retaining ring component (3) is arranged inside the mold.

3. The method according to claim 1, characterized in that The heating method is to implement contact heat transfer to the glass preform (2) through the retaining ring component (3).

4. The method according to claim 2, characterized in that The retaining ring component (3) is in close contact with the non-optical surface of the glass preform (2), positioning and clamping the glass preform (2), so that the optical surface of the glass preform (2) is separated from the inner surface of the mold cavity; after the heating is completed, the retaining ring component (3) releases the glass preform (2) into the mold cavity, so that it enters the molding process.

5. The method according to claim 4, characterized in that The retaining ring component (3) releases the glass preform (2), which is completed synchronously with the closing action of the mold.

6. The method according to claim 1, characterized in that The gas is a single gas or a composite gas.

7. The method according to claim 6, characterized in that The single gas is an inert gas.

8. The method according to claim 1, characterized in that Adjust gas pressure, temperature and flow rate according to the surface treatment requirements of the glass material.

9. A device for implementing the method according to any one of claims 1 to 8, comprising a mold, wherein the mold comprises an upper mold core (1) and a lower mold core (5), characterized in that: The invention also includes a retaining ring component (3), which is arranged between the upper mold core (1) and the lower mold core (5). The retaining ring component (3) includes an upper semicircular ring (3-2) and a lower semicircular ring (3-3). The radii of the two semicircular rings are equal and both are larger than the radius of the molded target lens (8). The axial ends of the two semicircular rings are both provided with stoppers for clamping and limiting the glass preform (2). Two upper driving mechanisms (3-1) and two lower driving mechanisms (3-4) are respectively provided on the outer sides of the upper semicircular ring (3-2) and the lower semicircular ring (3-3). The upper driving mechanism (3-1) and the lower driving mechanism (3-4) respectively apply forces to the upper semicircular ring (3-2) and the lower semicircular ring (3-3) to control the movement of the upper semicircular ring (3-2) and the lower semicircular ring (3-3). During the heating and glass surface treatment process, under the mutual push of the upper driving mechanism (3-1) and the lower driving mechanism (3-4), the upper semicircular ring (3-2) and the lower semicircular ring (3-3) always maintain the positioning and clamping of the glass preform (2), while keeping the optical surface of the glass preform (2) separated from the inner surface of the mold cavity, and maintain this state until the heating is completed; after the heating and surface treatment are completed, the upper mold core (1) moves downward under the action of external pressure to close the mold, and the glass preform (2) is released into the mold cavity.

10. The device according to claim 9, characterized in that A guide column (6) is provided on each of the left and right sides of the upper mold core (1), and is connected to the upper mold core (1) in an interference fit manner. During heating and surface treatment, the ends of the guide columns (6) contact the openings of the guide column holes reserved on both sides of the retaining ring component (3). After heating is completed, the guide columns (6) move downward to push the upper drive mechanism (3-1) and the lower drive mechanism (3-4) to move in opposite directions, so that the upper semicircular ring (3-2) and the lower semicircular ring (3-3) are separated from each other, and the glass preform (2) is no longer held in a clamping state, and the glass preform (2) is released into the lower mold core (5).

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