Lens mold

Abstract

The lens mold comprises a first mold body and a second mold body, the first mold body is provided with a first lens forming face, at least two forming plates are installed on the first mold body in a sliding mode, all the forming plates are arranged in the circumferential direction of the first lens forming face, and a forming groove is formed in one end of each forming plate; the forming plate can slide close to or away from the first lens forming surface; the first die body is provided with a first lens forming face, the second die body is provided with a second lens forming face, a driving device is arranged between the first die body and the second die body and used for driving the forming plate to slide to be close to or away from the first lens forming face, and a pouring system is arranged between the first die body and the second die body. And all the forming plates are close to the first lens forming surface, the side walls of all the forming grooves, the first lens forming surface and the second lens forming surface enclose to form a lens forming cavity. The lens mold provided by the invention can effectively avoid serious deformation of a large-size thin lens in a demolding stage, and ensures the quality of the lens.

Description

Technical Field

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

[0002] In existing technologies, large-sized lenses with a diameter of approximately 10cm are mostly formed using injection molds. Compared to conventional-sized lenses with a diameter of approximately 2cm, the molding difficulty of large-sized lenses is significantly increased, and improving the molding quality of large-sized lenses is a technical challenge in this field. Especially for large-sized thin lenses with a thickness of only about 1mm, their molding quality is not only affected by the mold processing accuracy and assembly accuracy, but is also highly susceptible to deformation defects during the demolding stage, leading to a decrease in lens quality. During the demolding process, existing lens molds generally adopt a ring-shaped multi-point synchronous ejection method. First, multiple ejector pins arranged in a ring on the mold push the lens out of the lens molding cavity, and then the lens is removed. However, when the lens is removed from the lens molding cavity, large-sized thin lenses are prone to excessive relative deformation between the outer ring and the central area, which leads to a decrease in the optical accuracy of the lens or even renders the lens unusable. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a lens mold that, by disassembling the lens molding cavity, allows the lens to be detached from the cavity, effectively preventing severe deformation of large-sized thin lenses during the demolding stage and ensuring lens quality.

[0004] According to an embodiment of the present invention, a lens mold includes a first mold body and a second mold body. One end of the first mold body is provided with a first lens forming surface. At least two forming plates are slidably mounted on one end of the first mold body, and all the forming plates are arranged circumferentially around the first lens forming surface. A forming groove is provided at the end of each forming plate near the first lens forming surface, and the forming plate is slidably close to or away from the first lens forming surface. One end of the second mold body is provided with a second lens forming surface. A driving device is provided between the first mold body and the second mold body, and the driving device is used to drive the forming plates to slide closer to or away from the first lens forming surface. A gating system is provided between the bodies. When one end of the second mold body is closed with one end of the first mold body, all the molding plates are close to the first lens molding surface, and two adjacent molding plates are spliced ​​together. The first mold body and the second mold body clamp and fix the molding plates so that the sidewalls of all the molding grooves, the first lens molding surface and the second lens molding surface surround and form a lens molding cavity. The gating system is connected to the lens molding cavity. When the first mold body and the second mold body are separated, the driving device can drive all the molding plates away from the first lens molding surface and the second lens molding surface away from the first lens molding surface, so that the lens molding cavity is disassembled.

[0005] The lens mold according to the embodiments of the present invention has at least the following beneficial effects: The lens mold provided by the present invention can disassemble the lens molding cavity to realize the lens detachment from the lens molding cavity so that the lens can be removed later. This demolding method does not actively remove the lens from the lens molding cavity, but rather the molding plate that makes up the circumferential sidewall of the lens molding cavity moves away from the first lens molding surface, thereby realizing the lens detachment from the lens molding cavity in the reverse direction. This effectively avoids severe deformation of large-size thin lenses during the demolding stage and ensures the quality of the lens.

[0006] According to some embodiments of the present invention, the molding plate includes a main board, which is slidably mounted on one end of the first mold body. A molding part is provided at one end of the main board near the molding surface of the first lens, and a molding groove is formed in the molding part. When the first mold body and the second mold body are molded together, the molding part is in contact with the first mold body.

[0007] According to some embodiments of the present invention, the first mold body is provided with a positioning boss around the first lens forming surface, and the first mold body is provided with a mounting groove around the positioning boss. The thickness of the main board is greater than the thickness of the forming part. There is a clearance gap between the outer periphery of the positioning boss and the main board. The main board is slidably mounted in the mounting groove. The driving device is in transmission cooperation with the main board. When the forming plate slides close to the first lens forming surface, the positioning boss abuts and fits against the forming part.

[0008] According to some embodiments of the present invention, the first mold body is provided with an air supply channel, which is connected to the clearance gap. The outer periphery of the positioning boss is provided with a first air guide surface, and the end of the main board facing the positioning boss is provided with a second air guide surface. The first mold body is provided with an air supply channel, which is connected to the clearance gap. When the molding plate slides away from the first lens molding surface, the molding part disengages from the positioning boss to form an air outlet between the molding part and the positioning boss.

[0009] According to some embodiments of the present invention, the cross-section of the lens forming cavity is circular, the diameter of the lens forming cavity is greater than 8cm, and the axial thickness of the lens forming cavity is less than 2mm.

[0010] According to some embodiments of the present invention, the gating system has a submarine gate disposed in the first mold body and located between two of the molding plates, the submarine gate being located outside the first lens molding surface and communicating with the lens molding cavity.

[0011] According to some embodiments of the present invention, the driving device includes a first transmission member and a second transmission member, both of which are disposed on the second mold body. Both the first transmission member and the second transmission member are used to detachably drive and cooperate with the molding plate. When the first mold body and the second mold body are closed, the first transmission member can drive the molding plate to slide closer to the first lens molding surface. When the second mold body is separated from the first mold body, the second transmission member can drive the molding plate to slide away from the first lens molding surface.

[0012] According to some embodiments of the present invention, the first transmission member is provided with a first transmission inclined surface, the molding plate is provided with a second transmission inclined surface, the second transmission inclined surface is provided with a transmission groove on the side opposite to the first lens molding surface, the second transmission member is inclined, and the molding plate is provided with an inclined actuating hole. During the mold closing process of the first mold body and the second mold body, the second transmission member is inserted into the actuating hole, and one end of the first transmission member is inserted into the transmission groove. The first transmission member drives the molding plate to slide closer to the first lens molding surface through the cooperation between the second transmission inclined surface and the first transmission inclined surface. During the separation process of the first mold body and the second mold body, the second lens molding surface first moves away from the molding groove, and then the second transmission member abuts against one side wall of the actuating hole to drive the molding plate to slide away from the first lens molding surface.

[0013] According to some embodiments of the present invention, the first mold body has a mounting hole, the mounting hole is used to mount a first mold core, the first lens forming surface is at least partially located in the first mold core, and a ball bearing sleeve is provided between the first mold core and the inner wall of the mounting hole; the second mold body is provided with a second mold core, and the second lens forming surface is at least partially located in the second mold core.

[0014] According to some embodiments of the present invention, the demolding steps include: S1: the first mold body and the second mold body separate from each other, wherein the second lens forming surface is first moved away from the forming groove, and then the driving device drives the forming plate away from the first lens forming surface, so as to disintegrate the lens forming cavity; S2: the unloading mechanism holds the lens on the first lens forming surface through the porous vacuum adsorption device, and then the unloading mechanism removes the lens from the first lens forming surface; during the process of the porous vacuum adsorption device holding the lens, the porous vacuum adsorption device first performs a first stage of vacuum adsorption with periodic changes in suction force at a preset distance from the lens, while the vibration device drives the first mold core to vibrate, and then the porous vacuum adsorption device moves closer to the lens to perform a second stage of vacuum adsorption, thereby completing the porous vacuum adsorption device holding the lens.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a cross-sectional view of the lens mold (during mold parting) according to an embodiment of the present invention; Figure 2 for Figure 1A cross-sectional view of the lens mold (when closed); Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view of point B in the middle; Figure 5 for Figure 1 A schematic diagram of the first mold body of the lens mold is shown; Figure 6 for Figure 1 A schematic diagram of the second mold body of the lens mold is shown; Figure 7 A cross-sectional view of the lens mold produced for 2 on section CC.

[0017] Figure label: First mold body 110, mounting hole 111, positioning boss 112, first air guide surface 1121, gate part 113, mounting groove 114, second mold body 120, first mold core 130, first lens forming surface 131, second mold core 140, second lens forming surface 141, lens forming cavity 150, gating system 160, submarine gate 161, molding plate 170, main plate 171, second air guide surface 1711, transmission groove 1712 The components include: second transmission inclined surface 1713, actuation hole 1714, forming part 172, forming groove 1721, exhaust groove 1722, pressure relief groove 1723, clearance gap 180, air outlet 181, first cooling channel 191, second cooling channel 192, driving device 200, first transmission component 210, first transmission inclined surface 211, second transmission component 220, ball bearing sleeve 300, excess material ejection device 400, and vibration device 500. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] Existing lens molds typically demold by directly ejecting the lens axially from the lens forming cavity. During demolding, the circumferential sidewalls of the lens forming cavity hinder the lens's ejection. Simultaneously, the circumferential sidewalls of the cavity, along with the lens, seal the cavity, creating a vacuum between the lens and the bottom wall of the cavity. This results in pressure in the center of the lens, making direct ejection difficult. In particular, existing lens molds commonly employ a ring-shaped, multi-point synchronous ejection method, which can lead to excessive deformation between the central area and the outer ring of large, thin lenses. This can result in decreased optical precision or even render the lens unusable.

[0023] Reference Figures 1 to 4According to an embodiment of the present invention, a lens mold includes a first mold body 110 and a second mold body 120. One end of the first mold body 110 is provided with a first lens forming surface 131. At least two forming plates 170 are slidably mounted on one end of the first mold body 110. All the forming plates 170 are arranged circumferentially around the first lens forming surface 131. A forming groove 1721 is provided at the end of each forming plate 170 near the first lens forming surface 131, allowing the forming plates 170 to slide closer to or away from the first lens forming surface 131. One end of the second mold body 120 is provided with a second lens forming surface 141. A driving device 200 is provided between the first mold body 110 and the second mold body 120. The driving device 200 is used to drive the forming plates 170 to slide closer to or away from the first lens forming surface 131. A gating system 160 is provided between the second mold bodies 120. When one end of the second mold body 120 is closed with one end of the first mold body 110, all the molding plates 170 are close to the first lens molding surface 131, and two adjacent molding plates 170 are spliced ​​together. The first mold body 110 and the second mold body 120 clamp and fix the molding plates 170 so that the side walls of all the molding grooves 1721, the first lens molding surface 131 and the second lens molding surface 141 surround and form a lens molding cavity 150. The gating system 160 is connected to the lens molding cavity 150. When the first mold body 110 and the second mold body 120 are separated, the driving device 200 can drive all the molding plates 170 away from the first lens molding surface 131 and the second lens molding surface 141 away from the first lens molding surface 131 so that the lens molding cavity 150 is disassembled.

[0024] The lens mold provided by the present invention can disassemble the lens forming cavity 150 to remove the lens from the lens forming cavity 150 for subsequent removal. This demolding method does not actively remove the lens from the lens forming cavity 150, but rather removes the lens from the lens forming cavity 150 by moving the forming plate 170, which forms the circumferential sidewall of the lens forming cavity 150, away from the first lens forming surface 131. This process avoids the lens being obstructed by the sidewall of the lens forming cavity 150 and the lens center being compressed by the vacuum at the bottom of the lens forming cavity 150. This effectively avoids severe deformation of large-size thin lenses during the demolding stage and ensures lens quality.

[0025] Reference Figure 1 and Figure 5 According to some embodiments of the present invention, the molding plate 170 includes a main plate 171, which is slidably mounted on one end of the first mold body 110. A molding portion 172 adapted to the lens thickness is provided at one end of the main plate 171 near the first lens molding surface 131. A molding groove 1721 is formed in the molding portion 172. Referring to… Figure 2 and Figure 4When the first mold 110 and the second mold 120 are molded together, the molding part 172 fits into the first mold 110, thereby effectively sealing the lens molding cavity 150.

[0026] Reference Figure 1 and Figure 5 According to some embodiments of the present invention, the first mold body 110 is provided with a positioning boss 112 around the first lens forming surface 131, and the first mold body 110 is provided with a mounting groove 114 around the positioning boss 112. The thickness of the main board 171 is greater than the thickness of the forming part 172. The main board 171 is slidably mounted in the mounting groove 114. The drive device 200 is in transmission cooperation with the main board 171. Figure 2 and Figure 4 When the molding plate 170 slides close to the first lens molding surface 131, the positioning boss 112 abuts against and fits against the molding part 172 to support the molding part 172 and close the lens molding cavity 150. Thus, by thickening the part of the molding plate 170 that is in transmission cooperation with the drive device 200—the main plate 171—severe deformation of the molding part 172 during sliding can be avoided, the accuracy of the molding part 172 can be maintained, its service life can be improved, and ultimately the lens molding accuracy can be guaranteed.

[0027] According to an embodiment of the present invention, the lens mold can be applied to large-sized thin circular lenses with a diameter greater than 8cm and an axial thickness less than 2mm. Correspondingly, the lens forming cavity 150 has a circular cross-section, a diameter greater than 8cm, and an axial thickness less than 2mm. At this time, the thickness of the forming part 172 is adapted to the thickness of the lens forming cavity 150, and the forming part 172 is arc-shaped, and the forming groove 1721 is also arc-shaped.

[0028] It should be noted that, in some other embodiments, the lens mold provided by the present invention can also be applied to non-circular large-size thin lenses, such as non-circular large-size thin lenses with an outer circle greater than 8cm, a thickness less than 2mm, and a polygonal shape.

[0029] Reference Figure 3 and Figure 4 According to some embodiments of the present invention, there is a clearance gap 180 between the outer periphery of the positioning boss 112 and the main board 171, so as to avoid the machining accuracy of the outer periphery of the positioning boss 112 affecting the sliding range of the main board 171 and to ensure that the forming part 172 accurately reaches the working position.

[0030] According to some embodiments of the present invention, the first mold body 110 is provided with an air supply channel, which is connected to the clearance gap 180. With the above arrangement, air cooling can be achieved around the lens forming cavity 150. In addition, during the lens mold production process, the clearance gap 180 can be used to test the airtightness between the forming part 172 and the positioning boss 112.

[0031] Reference Figure 5 In specific implementation, the side of the molding part 172 facing the second mold body 120 is the parting surface. The parting surface typically has an venting groove 1722 and a pressure relief groove 1723. The venting groove 1722 communicates with the molding groove 1721, and the pressure relief groove 1723 is located on the side of the venting groove 1722 away from the molding groove 1721 and communicates with the venting groove 1722. The depth of the venting groove 1722 is less than or equal to the flash value of the material used for the lens, to expel air from the lens molding cavity during injection molding and prevent flash from forming on the molded lens. The depth of the pressure relief groove 1723 is greater than the depth of the venting groove 1722, to allow for rapid air expulsion from the venting groove 1722. The flash value is the minimum gap thickness at which flash just begins to form during injection molding. The flash value for different materials can be determined based on existing production process data or the manufacturer's own production experience. In this invention, the molding plate 170 is detachable; therefore, by replacing different molding plates, the lens mold can be adapted to produce lenses made of different materials.

[0032] Reference Figure 7 In the specific implementation process, in order to accelerate the cooling speed, the first mold body 110 and the second mold body 120 are usually provided with a first cooling channel 191, and the cooling liquid is delivered to the first cooling channel 191 to achieve rapid cooling.

[0033] Reference Figure 5 and Figure 7According to some embodiments of the present invention, the gating system 160 has a submarine gate 161 disposed in the first mold body 110 and located between two molding plates 170 therein. The submarine gate 161 is located outside the first lens molding surface 131 and communicates with the lens molding cavity 150. The side of the molding plate 170 facing the second mold body 120 is the parting surface. The submarine gate 161 is located on the lower side of the parting surface and is inclined to connect to the lens molding cavity 150. This makes the flow area of ​​the submarine gate 161 gradually decrease as it approaches the lens molding cavity 150. As a result, the connection between the submarine gate 161 and the lens molding cavity 150 is relatively narrow. After injection molding, the excess material in the gating system forms a narrow neck structure at the connection between the submarine gate 161 and the lens molding cavity 150. When the mold is opened, the narrow neck structure can be automatically broken, so that the lens and the excess material are automatically separated. This prevents external force from being transmitted from the excess material across the narrow neck structure to the lens, ensuring the appearance of the lens and preventing the lens from being deformed by the excess material.

[0034] Reference Figure 7 In the specific implementation process, the first mold body 110 is also equipped with a residual material ejection device 400. During demolding, the residual material ejection device 400 is used to eject the residual material at the gating system 160. Since the connection between the residual material and the lens has been cut off, the ejection of the residual material will not affect the lens.

[0035] Reference Figure 5 In the specific implementation process, the first mold body 110 is provided with a gate part 113, and the submarine gate 161 is located in the gate part 113. When the first mold body 110 and the second mold body 120 are closed, the opposite two sides of the gate part 113 are in one-to-one contact with the two corresponding molding plates 170 to ensure the airtightness between the molding plate 170 and the gate part and to prevent defects such as flash. At the same time, the gate part 113 is used to position the molding plate 170 to ensure that the molding plate 170 slides accurately.

[0036] Reference Figure 1 , Figure 2 , Figure 6According to some embodiments of the present invention, the driving device 200 includes a first transmission member 210 and a second transmission member 220. Both the first transmission member 210 and the second transmission member 220 are disposed on the second mold body 120. Both the first transmission member 210 and the second transmission member 220 are used to detachably drive and cooperate with the molding plate 170. When the first mold body 110 and the second mold body 120 are closed, the first transmission member 210 can drive the molding plate 170 to slide close to the first lens molding surface 131. When the second mold body 120 is separated from the first mold body 110, the second transmission member 220 can drive the molding plate 170 to slide away from the first lens molding surface 131. With the above settings, the drive device 200 does not require additional power. It uses the relative movement between the first mold body 110 and the second mold body 120 to drive the molding plate 170 to slide. The structure is ingenious and simple, a purely mechanical structure, with high reliability and low failure rate. Moreover, the sliding position of the molding plate 170 is strongly related to the use state of the lens mold (mold closing or mold opening). It will not cause the molding plate 170 to not be close to the first lens molding surface 131 during mold closing, resulting in the lens molding cavity 150 not being formed, thus avoiding injection molding errors.

[0037] Reference Figure 1 , Figure 2 , Figure 5 and Figure 6 According to some embodiments of the present invention, the first transmission member 210 is provided with a first transmission inclined surface 211, the molding plate 170 is provided with a second transmission inclined surface 1713, the second transmission inclined surface 1713 is provided with a transmission groove 1712 on the side opposite to the first lens molding surface 131, the second transmission member 220 is inclined, and the molding plate 170 is provided with an inclined actuating hole 1714. During the mold closing process of the first mold body 110 and the second mold body 120, the second transmission member 220 is inserted into the actuating hole 1714, and one end of the first transmission member 210 is inserted into the transmission groove 1712. The actuator 210, through the engagement between the second drive ramp 1713 and the first drive ramp 211, drives the molding plate 170 to slide closer to the first lens molding surface 131, and causes one side wall of the actuating hole 1714 to move closer to the second drive member 220. During the separation of the first mold body 110 and the second mold body 120, the second lens molding surface 141 first moves away from the molding groove 1721, causing the lens to move away from the second lens molding surface 141. Then, the second drive member 220 engages with one side wall of the actuating hole 1714 to drive the molding plate 170 to slide away from the first lens molding surface 131. With the above configuration, the first drive member 210 can drive the molding plate 170 to slide closer to the first lens molding surface 131 when the mold is closed, and the second drive member 220 can drive the molding plate 170 to slide away from the first lens molding surface 131 when the mold is separated.

[0038] It should be noted that in some other embodiments, the driving device 200 may also adopt other configuration methods. For example, the driving device 200 may include a cylinder, which is disposed on the first mold body 110 and connected to the molding plate 170, thereby the molding plate 170 can be directly driven to slide by the cylinder.

[0039] Reference Figure 1 and Figure 2 According to some embodiments of the present invention, the first mold body 110 has a mounting hole 111, and a first mold core 130 is mounted in the mounting hole 111. The first lens forming surface 131 is at least partially located on the first mold core 130. A ball bearing sleeve 300 is provided between the first mold core 130 and the inner wall of the mounting hole 111 to ensure easy assembly and disassembly of the first mold core 130. A vibration device 500 is provided between the first mold core 130 and the first mold body 110 to vibrate the first mold core 130 during lens removal. The second mold body 120 is provided with a second mold core 140, and the second lens forming surface 141 is at least partially located on the second mold core 140. In the art, the first mold core 130 and the second mold core 140 are usually precision-machined from materials specifically used for lens injection molding. Therefore, setting the lens forming surface on a dedicated mold core can ensure that the processing accuracy, processing quality, and other properties of the lens forming surface meet product requirements.

[0040] Reference Figure 1 and Figure 2 According to some embodiments of the present invention, both the first mold core 130 and the second mold core 140 are provided with a second cooling channel 192 to improve the cooling speed and cooling uniformity.

[0041] Reference Figure 1 and Figure 3 , Figure 4 In the specific implementation process, a first air guide surface 1121 is provided on the outer periphery of the positioning boss 112, and a second air guide surface 1711 is provided on the end of the main board 171 facing the positioning boss 112. The clearance gap 180 is located between the first air guide surface 1121 and the second air guide surface 1711 to increase the air cooling area and improve the air cooling efficiency. When the molding plate 170 slides away from the first lens molding surface 131, the molding part 172 disengages from the positioning boss 112, forming an air outlet 181 between the molding part 172 and the positioning boss 112. Thus, when the first mold body 110 and the second mold body 120 separate, air can be sent from the air outlet 181 to the first lens molding surface 131. The flowing air forms a negative pressure above the first lens molding surface 131. At the same time, the vibration device 500 vibrates the first mold core 130, thereby causing the lens to detach from the first lens molding surface 131, making it convenient for subsequent workers or unloading mechanisms to remove the lens. In addition, air can be sent to the first lens molding surface 131 to clean dust.

[0042] According to some embodiments of the present invention, the demolding step of the lens mold of the present invention may include: S1: the first mold body 110 and the second mold body 120 separate from each other, wherein the second lens forming surface 141 first moves away from the forming groove 1721, and then the driving device 200 drives the forming plate 170 away from the first lens forming surface 131, so that the lens forming cavity 150 disintegrates; S2: the unloading mechanism holds the lens on the first lens forming surface 131 through the porous vacuum adsorption device, and then the unloading mechanism removes the lens from the first lens forming surface 131. The porous vacuum adsorption device has numerous uniformly arranged vacuum holes, which can uniformly adsorb the lens, making the force more uniform during the lens detachment from the first lens forming surface 131. Since the sidewall of the lens forming cavity 150 is removed, the sidewall of the lens forming cavity 150 will not hinder the lens detachment from the first lens forming surface 131, and also allows outside air to easily enter between the lens and the first lens forming surface 131, thereby making it easier for the lens to detach from the first lens forming surface 131, reducing the force on the lens, and reducing lens deformation.

[0043] In some embodiments, during the process of holding a lens by a porous vacuum adsorption device, the porous vacuum adsorption device first performs a first stage of vacuum adsorption with periodic changes in suction strength at a preset distance from the lens. At the same time, the vibration device 500 drives the first mold core 130 to vibrate. Then, the porous vacuum adsorption device moves closer to the lens to perform a second stage of vacuum adsorption, thereby completing the process of holding the lens by the porous vacuum adsorption device. The first-stage vacuum adsorption uses an air-tight adsorption method, which can create a more uniform negative pressure zone above the lens, thereby subjecting the lens to a more evenly distributed upward suction force. Secondly, the suction force generated by the first-stage vacuum adsorption changes periodically, which can vibrate the lens. At the same time, the vibration device 500 drives the first mold core 130 to vibrate, thereby causing a slight relative movement between the lens and the first lens forming surface 131. Since the sidewall of the lens forming cavity 150 has been removed, the vibration of the lens is not hindered or restricted by the lens forming cavity 150. During the relative vibration between the lens and the first mold core 130, outside air can enter between the lens and the first lens forming surface 131, eliminating the vacuum and breaking the interfacial adhesion between the lens and the first lens forming surface 131, thereby releasing the tight adhesion between the lens and the first lens forming surface 131. As a result, the subsequent unloading mechanism can remove the lens as a whole, synchronously, and without stress from the first lens forming surface 131, further reducing the force on the lens during the process of detaching from the first lens forming surface 131.

[0044] In the specific implementation process, the vibration device 500 drives the first mold core 130 to vibrate ultrasonically at a low amplitude, while the suction force change frequency of the vacuum adsorption in the first stage is less than 100 Hz, so that the vibration of the lens and the vibration of the first mold core 130 are staggered. In this way, it is easier to release the tight adhesion between the lens and the first lens forming surface 131.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A lens mold, characterized in that, include: A first mold body (110) is provided with a first lens forming surface (131) at one end of the first mold body (110). At least two forming plates (170) are slidably installed at one end of the first mold body (110). All the forming plates (170) are arranged circumferentially around the first lens forming surface (131). A forming groove (1721) is provided at the end of the forming plate (170) close to the first lens forming surface (131). The forming plate (170) can slide close to or away from the first lens forming surface (131). The second mold (120) has a second lens forming surface (141) at one end; A driving device (200) is provided between the first mold body (110) and the second mold body (120). The driving device (200) is used to drive the molding plate (170) to slide closer to or away from the first lens molding surface (131). A gating system (160) is provided between the first mold body (110) and the second mold body (120). When one end of the second mold body (120) is closed with one end of the first mold body (110), all the molding plates (170) are close to the first lens molding surface (131), and two adjacent molding plates (170) are joined together. The first mold body (110) and the second mold body (120) are connected. 20) The molding plate (170) is clamped and fixed so that the sidewalls of all the molding grooves (1721), the first lens molding surface (131) and the second lens molding surface (141) surround and form a lens molding cavity (150). The gating system (160) is connected to the lens molding cavity (150). When the first mold (110) and the second mold (120) are separated, the driving device (200) can drive all the molding plates (170) away from the first lens molding surface (131) and the second lens molding surface (141) away from the first lens molding surface (131) so that the lens molding cavity (150) disintegrates.

2. The lens mold according to claim 1, characterized in that, The molding plate (170) includes a main plate (171), which is slidably mounted on one end of the first mold body (110). A molding part (172) is provided on one end of the main plate (171) near the first lens molding surface (131). A molding groove (1721) is formed in the molding part (172). When the first mold body (110) and the second mold body (120) are molded together, the molding part (172) is attached to the first mold body (110).

3. A lens mold according to claim 2, characterized in that, The first mold body (110) is provided with a positioning boss (112) around the first lens forming surface (131). The first mold body (110) is provided with a mounting groove (114) around the positioning boss (112). The thickness of the main board (171) is greater than the thickness of the forming part (172). The main board (171) is slidably mounted in the mounting groove (114). The driving device (200) is in transmission cooperation with the main board (171). There is a clearance gap (180) between the outer periphery of the positioning boss (112) and the main board (171). When the forming plate (170) slides close to the first lens forming surface (131), the positioning boss (112) abuts and fits against the forming part (172).

4. A lens mold according to claim 3, characterized in that, The first mold body (110) is provided with an air supply channel, which is connected to the clearance gap (180). The outer periphery of the positioning boss (112) is provided with a first air guide surface (1121), and the end of the main board (171) facing the positioning boss (112) is provided with a second air guide surface (1711). The clearance gap (180) is located between the first air guide surface (1121) and the second air guide surface (1711). When the molding plate (170) slides away from the first lens molding surface (131), the molding part (172) disengages from the positioning boss (112) to form an air outlet (181) between the molding part (172) and the positioning boss (112).

5. A lens mold according to claim 1, characterized in that, The lens forming cavity (150) has a circular cross-section, a diameter greater than 8cm, and an axial thickness less than 2mm.

6. A lens mold according to claim 1, characterized in that, The gating system (160) includes a submarine gate (161) which is disposed in the first mold body (110) and located between two of the molding plates (170). The submarine gate (161) is located outside the first lens molding surface (131) and communicates with the lens molding cavity (150).

7. A lens mold according to claim 1, characterized in that, The driving device (200) includes a first transmission member (210) and a second transmission member (220). The first transmission member (210) and the second transmission member (220) are both disposed on the second mold body (120). The first transmission member (210) and the second transmission member (220) are both used to detachably drive and cooperate with the molding plate (170). When the first mold body (110) and the second mold body (120) are closed, the first transmission member (210) can drive the molding plate (170) to slide close to the first lens molding surface (131). When the second mold body (120) is separated from the first mold body (110), the second transmission member (220) can drive the molding plate (170) to slide away from the first lens molding surface (131).

8. A lens mold according to claim 7, characterized in that, One end of the first transmission member (210) is provided with a first transmission inclined surface (211), and the molding plate (170) is provided with a second transmission inclined surface (1713). A transmission groove (1712) is provided on the side of the second transmission inclined surface (1713) facing away from the first lens molding surface (131). The second transmission member (220) is inclined, and the molding plate (170) is provided with an inclined actuating hole (1714). During the mold closing process between the first mold body (110) and the second mold body (120), the second transmission member (220) inserts into the actuating hole (1714), and the first transmission member (210)... One end is inserted into the transmission groove (1712). The first transmission member (210) drives the molding plate (170) to slide close to the first lens molding surface (131) through the cooperation between the second transmission inclined surface (1713) and the first transmission inclined surface (211). During the separation process between the first mold body (110) and the second mold body (120), the second lens molding surface (141) moves away from the molding groove (1721) first. Then, the second transmission member (220) abuts against one side wall of the actuating hole (1714) to drive the molding plate (170) to slide away from the first lens molding surface (131).

9. A lens mold according to claim 1, characterized in that, The first mold body (110) has a mounting hole (111) and a first mold core (130) is installed in the mounting hole (111). The first lens forming surface (131) is at least partially located in the first mold core (130). A vibration device (500) is provided between the first mold core (130) and the first mold body (110).

10. A lens mold according to claim 9, characterized in that, Its demolding steps include: S1: The first mold (110) and the second mold (120) are separated from each other, wherein the second lens forming surface (141) is first moved away from the forming groove (1721), and then the driving device (200) drives the forming plate (170) away from the first lens forming surface (131) so that the lens forming cavity (150) disintegrates; S2: The unloading mechanism holds the lens on the first lens forming surface (131) through the porous vacuum adsorption device. Finally, the unloading mechanism removes the lens from the first lens forming surface (131). During the process of holding the lens by the porous vacuum adsorption device, the porous vacuum adsorption device first performs a first stage of vacuum adsorption with periodic changes in suction force at a preset distance from the lens. At the same time, the vibration device (500) drives the first mold core (130) to vibrate. Then, the porous vacuum adsorption device moves closer to the lens to perform a second stage of vacuum adsorption, thereby completing the holding of the lens by the porous vacuum adsorption device.

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