Optical lens mold and lens forming and demolding method thereof

Abstract

The invention relates to the technical field of optical lens molds, in particular to an optical lens mold and a lens forming and demolding method thereof.The optical lens mold comprises an upper cover plate, an upper mold core, a lower mold core, a bottom plate, a demolding assembly, a middle mold and a lens finished product; the lower mold core is arranged to be in a semicircular protrusion shape and installed on the surface of the bottom plate, the middle mold is installed on the bottom plate in a sliding mode, the upper cover plate covers and fits the middle mold, a cavity is formed among the upper cover plate, the middle mold and the lower mold core, the optical lens is formed in the cavity, and the demolding assembly is arranged in the middle mold. By layering the mold of the optical lens, the binding force of the lens finished product to the mold core is reduced during demolding, the surface type distortion of the lens finished product caused by the binding force is avoided, the quality and yield of the lens finished product are improved, and the production qualification rate of the lens finished product is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of optical lens molds, and in particular to an optical lens mold and a lens molding and demoulding method thereof. Background Art

[0002] Optical lenses refer to transparent materials with one or more curved surfaces made of optical materials such as glass or resin, and are used in structures such as optical systems. When using resin to make optical lenses, molds are required to achieve molding. With the replacement of mobile phones and cameras, the precision requirements for optical lenses are getting higher and higher, and at the same time, the requirements for mold precision are also increasing. The existing mold technology basically adopts the method of ejection from the movable mold side, that is, the front mold does not move, and the rear mold ejects the already solidified optical lens in the runner with an ejector pin during the mold separation process. This mold technology can guarantee the quality and yield of most optical lenses, but for some special lenses, such as ultra-thin lenses, lenses with a large difference in thickness, or lenses with severe and steep edge curvatures. For these types of lenses, after injection molding and pressure holding, during the demolding process, the fixed mold side and the movable mold side will often cause the lens surface to distort and deform during separation and demolding due to the deep and steep curved surfaces and strong surface bonding with the mold core. The curved surfaces on both sides of the lens will produce Yas problems, resulting in serious surface errors, which will directly lead to ghosting or blurring of the image and a decrease in the resolution of the optical image.

[0003] In order to avoid the bending of the surface of the optical lens after molding and demolding, which may cause ghosting or blurred images, the invention patent with application number CN202020518590.8 provides a precise mold and optical lens for demolding on the fixed mold side. The invention arranges a demolding mechanism on the fixed mold, and an arc-shaped channel structure with a circular arc slope on the edge of the mirror area of ​​the front mold core, and an avoidance space is arranged between the arc-shaped channel structures. The ejector pin on the demolding mechanism passes through the avoidance space, and the optical lens is demolded by the telescopic sliding of the ejector pin, thereby solving the deformation problem of the optical lens during molding and demolding, and ensuring high-precision production of the product. However, the ejector pin may wear during use, resulting in uneven force during the lens ejection process, and there is still a large bonding force when the optical lens is demolded inside the mold. Therefore, there is still a problem of distortion and deformation of the surface of the optical lens due to excessive bonding force during demolding.

[0004] Therefore, in order to avoid the Yass phenomenon when the optical lens is separated from the mold, which causes the surface of the optical lens to be distorted and deformed, and causes ghosting and blurring of the imaging, an optical lens mold and a lens molding demolding method are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an optical lens mold and a lens molding and demolding method thereof, in order to prevent the optical lens from generating the Yass phenomenon when the mold is separated, resulting in distortion and deformation of the optical lens surface, ghosting and blurring of the imaging, thereby affecting the quality and yield of the optical lens and reducing the qualified rate of the optical lens, by setting the optical lens mold to three layers, the mold of the middle layer is opened to both sides during the optical lens molding and demolding, thereby reducing the binding force of the optical lens to the mold core, and when the ejector pin ejects the optical lens from the mold core, the Yass phenomenon caused by excessive binding force between the curved surface of the optical lens and the surface of the mold core is avoided, thereby causing distortion and deformation of the optical lens surface, ghosting and blurring of the imaging, thereby improving the quality and yield of the optical lens and ensuring the qualified rate of the optical lens.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An optical lens mold comprises an upper cover plate, an upper mold core, a bottom plate, a lower mold core, a demoulding assembly, an intermediate mold, and a finished lens product, wherein the lower mold core is fixedly installed in the middle of the bottom plate, the lower mold core is arranged in a semicircular convex shape, the intermediate mold is arranged in a curved plate with two side walls fitted to each other, the two curved plates can slide within a limited position on the upper surface of the bottom plate, the inner walls of the curved plates form a circle when the two curved plates are fitted, thrust assemblies are symmetrically arranged at the fitting positions of the curved plates, the demoulding assembly is installed inside the intermediate mold, and the thrust assembly drives the demoulding assembly to move when pushing the curved plates, the upper mold core is in a semicircular concave shape and is arranged inside the upper cover plate, the bottom of the upper mold core is flush with the bottom of the upper cover plate, the upper cover plate is fitted and covered with the intermediate mold, a cavity is formed between the upper cover plate, the intermediate mold and the lower mold core, the finished lens product is formed in the cavity, and the upper cover plate is provided with a perfusion flow channel, which is connected to the cavity.

[0008] The middle mold is installed by sliding on the bottom plate, and the upper cover plate fits and covers the middle mold. The molding mold of the optical lens is divided into three layers. The middle mold is set as two separable arc plates. When the two arc plates are fitted, the inner wall forms a circle, which is the side wall shape of the finished lens. The upper mold core is set inside the upper cover plate, and the bottom of the upper mold core is flush with the bottom of the upper cover plate. The lower mold core is a semicircular convex shape and is fixedly installed in the middle of the bottom plate. When the three-layer mold is fully fitted, the molten resin is injected from the infusion flow channel, and the finished lens can be formed in the cavity. After waiting for the resin to cool, the finished lens can be taken out of the mold. The thrust component can open the middle mold. During the opening of the middle mold, the demoulding component works to push the finished lens out of the lower mold core, and the mold is layered. When the optical lens is molded and demolded, the binding force of the optical lens on the mold core is reduced to avoid the Yas phenomenon caused by excessive binding force between the curved surface of the optical lens and the mold core surface, which leads to distortion and deformation of the optical lens surface, ghosting and blurring of the imaging, thereby improving the quality and yield of the optical lens and ensuring the qualified rate of the optical lens.

[0009] Preferably, the thrust assembly includes a pushing plate, a long rod, a pressure plate, a rotating rod, a pressure block, and a thrust spring. A rectangular groove is symmetrically opened inside the upper cover plate, the long rod is vertically fixedly mounted on the bottom plate, one end of the long rod passes through the middle mold and is located in the rectangular groove, an opening and closing groove is provided at the joint of the two arc plates, and pushing plates are symmetrically installed on both sides of the inner wall of the opening and closing groove, the pressure plate is horizontally sleeved on the long rod, the pressure plate can slide in the vertical direction with an upper limit, one end of the rotating rod is rotatably connected to the pushing plate, and the other end is rotatably connected to the pressure plate, the thrust spring is vertically wound on the long rod, one end of the thrust spring is fixedly mounted on the bottom plate, and the other end is connected to the bottom of the pressure plate, one end of the pressure block is set to be cylindrical, and the pressure block is slidably connected to the long rod, and the other end is set to be rectangular, located inside the rectangular groove and fits with the inner wall of the rectangular groove, and when the pressure plate slides downward in the vertical direction, the two pushing plates will move in the directions away from the two sides of the pressure plate.

[0010] By arranging a thrust assembly in the opening and closing groove, the top of the push plate is flush with the top of the opening and closing groove, and the top of the push plate is tightly fitted with the bottom of the upper cover plate, so as to avoid the push plate protruding from the top of the opening and closing groove to affect the molding process of the finished lens. When the two arc-shaped plates are fitted together, the top of the pressure plate and the top of the push plate are at the same horizontal position under the upward thrust of the thrust spring. When the pressure block is applied with vertical downward pressure, the cylindrical part of the pressure block and the long rod slide relative to each other, and the pressure block squeezes the pressure plate to make the pressure plate move vertically downward along the axis direction of the long rod. At this time, the rotating rods connected to the pressure plate and the push plate simultaneously rotate in a limited position, and the pressure plate transmits thrust through the rotating rod to make the push plate move away from the pressure plate on both sides, and the push plate pushes the two fitted arc plates apart, and the inner walls of the arc plates are separated from the contact with the side walls of the finished lens. At this time, the fitting force between the finished lens and the side walls of the mold disappears, making it easier for the finished lens to be ejected from the lower mold core when demolding, thereby preventing the optical lens from having a large bonding force with the inside of the mold when demolding, causing surface errors in the optical lens, and improving the quality of the finished optical lens.

[0011] Preferably, the demoulding assembly includes an ejector pin, a sliding support plate, a T-shaped block, a closed baffle plate, and a switch spring. The T-shaped block is symmetrically fixedly mounted on the bottom plate. The T-shaped block is located inside the arc-shaped plate. The top of the T-shaped block is cylindrical. The sliding support plate is arranged inside the arc-shaped plate on one side of the T-shaped block. One side of the sliding support plate is in contact with the inner wall of the arc-shaped plate. The sliding support plate can be limitedly moved in the horizontal and vertical directions. A curved track is provided in the sliding support plate. The curved track is composed of an arc and a rectangle. The rectangular part is close to one side of the T-shaped block. , and the top of the rectangular part and the top of the T-shaped block are at the same horizontal position, the arc-shaped part is close to the arc plate and is connected to the rectangular part, the arc opening of the arc is facing obliquely upward, the T-shaped block can slide in the curved track, the ejector pin is vertically fixed on the sliding support plate, a U-shaped switch groove is opened on the arc plate, the closed baffle is horizontally slidably installed in the switch groove, a long plate is vertically installed on the closed baffle, the long plate is fitted with one end of the sliding support plate, one end of the switch spring is fixedly installed on the T-shaped block, and the other end is connected to the long plate.

[0012] By fixing a T-block on the bottom plate, the top of the T-block is set to be cylindrical. When the arc plate drives the sliding pallet to move in the horizontal direction, the sliding pallet approaches the T-block, and one end of the sliding pallet pushes the long plate, so that the long plate drives the closed baffle to move in the horizontal direction. The switch spring is extended, and the switch slot is gradually opened when the closed baffle moves toward the inside of the arc plate. After the switch slot is opened, the top of the T-block begins to enter the curved track, and the T-block slides from the rectangular part to the circular arc part of the curved track. When the T-block slides in the rectangular part, the sliding pallet does not move in the vertical direction. When the T-block slides in the circular arc part, the sliding pallet gradually moves upward in the vertical direction, and the end of the ejector extends out of the switch slot, exerts a thrust on the edge of the optical lens, so that the optical lens is separated from the lower mold core, and when the arc plate is fitted The closed baffle closes the switch slot to prevent molten resin from falling into the demoulding component during the injection molding process. One end of the sliding pallet is fitted with the long plate. When the sliding pallet moves, the closed baffle is pushed as soon as possible. At this time, the T-block has not yet slid in the circular arc portion of the curved track to prevent the ejector from colliding with the closed baffle when it is extended, causing structural interference. When the push plate opens the curved plate, the T-plate slides in the rectangular portion of the curved track, and the ejector cannot extend. When the curved plate moves a certain distance, the T-block slides in the circular arc portion of the curved track, and the T-block drives the sliding pallet to move upward. The ejector performs demoulding only after the curved plate is separated from the side wall of the optical lens. This prevents the ejector from generating a tilting force when applying thrust to the side wall of the optical lens, affecting the demoulding effect of the optical lens, and improving the uniformity of the ejector thrust.

[0013] Preferably, a compensation spring is sleeved on the ejector pin, one end of the compensation spring is connected to the inside of the arc plate, and the other end is connected to the upper surface of the sliding support plate.

[0014] By arranging a compensation spring on the ejector pin, the compensation spring applies downward pressure to the sliding plate. After the sliding plate slides multiple times, friction loss will be generated on the surface. The pressure of the compensation spring makes the sliding plate close to the surface of the bottom plate, achieving the effect of friction loss compensation, thereby increasing the service life of the mechanism and ensuring the stable operation of the demoulding component.

[0015] Preferably, two identical telescopic springs are symmetrically mounted on the pushing plate, and the telescopic springs are connected to two pushing plates at opposite positions.

[0016] By symmetrically installing two identical telescopic springs on the push plate, when pressure is applied to the pressure block, the arc plate opens and the telescopic spring extends. After the pressure is removed, the telescopic spring contracts to automatically close the two arc plates. When the pressure plate moves downward and drives the push plate to slide, the spring damping will make the thrust of the push plate to both sides more uniform and stable, so that the finished lens is evenly stressed during demolding, avoiding distortion of the optical lens surface and ensuring the quality of the finished optical lens.

[0017] Preferably, a semicircular sliding groove is provided on the bottom plate, a semicircular slider is provided at the bottom of the arc plate, the semicircular slider slidably cooperates with the semicircular sliding groove, a square slider is installed on the arc plate, a square sliding groove is provided at the bottom of the upper cover plate, and the square slider slidably cooperates with the square sliding groove.

[0018] By opening a semicircular sliding groove on the bottom plate and a square sliding groove on the bottom of the upper cover plate, the curved plate can be moved more smoothly to both sides. When the upper cover plate is reinstalled on the middle mold, the square slider and the square sliding groove also have the function of positioning and guiding. The smooth sliding of the curved plate makes the finished lens evenly stressed during demolding, avoiding distortion of the optical lens surface and ensuring the qualified rate of the optical lens.

[0019] Preferably, the closed baffle plate has the same shape as the switch slot, and the thickness of the closed baffle plate is the same as the height of the switch slot, and the top of the ejector pin is flush with the bottom of the switch slot.

[0020] By setting the shape of the closed baffle to be the same as the switch slot and the thickness to be the same as the height of the switch slot, the closed baffle will not affect the shape of the optical lens during the injection molding process of the optical lens, and the top of the ejector pin is flush with the bottom of the switch slot. When the closed baffle moves toward the inside of the arc plate to open the switch slot, the ejector pin can extend out of the switch slot in time for demolding, and eject the optical lens out of the lower mold core, thereby avoiding distortion of the optical lens surface.

[0021] A lens molding and demoulding method for the above optical lens mold comprises the following steps:

[0022] S1. Injecting the liquid resin heated to a molten state into the cavity of the mold through an injection channel.

[0023] S2. After the liquid plastic is cooled, the finished lens is formed in the cavity, the upper cover is taken out, and the upper mold core is separated from the upper surface of the finished lens.

[0024] S3, applying pressure to the pressure block, the pressure plate moves vertically downward, the rotating rod is displaced to move the push plate to both sides, the push plate pushes the arc plate to open the middle mold, and the arc plate is separated from the side wall of the finished lens.

[0025] S4. During the process of continuously applying pressure, the movement of the arc plate drives the sliding support plate to move, one end of the sliding support plate pushes the closed baffle plate, the switch spring extends, and the closed baffle plate slides in the switch slot.

[0026] S5. After the sliding support plate moves a certain distance, the T-shaped block cooperates with the curved track, the T-shaped block slides in the curved track, the sliding support plate slides upward, and the ejector pin extends out of the switch slot to apply thrust to the bottom of the finished lens.

[0027] S6. The ejector pin completes the demoulding work, and the bottom of the finished lens is separated from the lower mold core. After the finished lens is taken out, no pressure is applied to the pressure block. After the telescopic spring contracts, the arc plate closes again.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. By dividing the mold of the optical lens into three layers, the bonding force of the optical lens to the mold core is reduced when the optical lens is molded and demolded, avoiding the Yass phenomenon caused by excessive bonding force between the curved surface of the optical lens and the surface of the mold core, resulting in distortion of the optical lens surface, double imaging and blurring, thereby improving the quality and yield of the optical lens and ensuring the qualified rate of the optical lens.

[0030] 2. By setting a thrust component in the middle mold, the middle mold is pushed open when the optical lens is demolded, so that the fitting force between the side wall of the optical lens and the mold disappears, which facilitates the optical lens to be ejected from the lower mold core when demolding, and prevents the optical lens from having a large bonding force with the inside of the mold when demolding, resulting in surface errors of the optical lens, thereby improving the quality of the finished optical lens.

[0031] 3. By setting a demoulding component inside the arc plate, the demoulding component is linked with the thrust component. The ejector pin will perform demoulding work only after the arc plate is separated from the side wall of the optical lens, avoiding the tilting force generated when the ejector pin applies thrust to the side wall of the optical lens, causing deformation of the curved surface when the optical lens is demoulded, and improving the uniformity of the ejector pin thrust. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the appearance structure of the present invention;

[0033] Figure 2 A schematic diagram of taking out the upper cover plate for the present invention;

[0034] Figure 3 Take out the top view of the upper cover plate for the present invention;

[0035] Figure 4 It is a schematic diagram of the structure of the thrust assembly of the present invention;

[0036] Figure 5 It is a schematic diagram of the structure of the demoulding component of the present invention;

[0037] Figure 6 It is a cutaway view of the thrust assembly of the present invention;

[0038] Figure 7 It is a cutaway view of the demoulding assembly of the present invention;

[0039] Figure 8 Schematic diagram of demoulding the optical lens of the present invention

[0040] Fig. 9 Schematic diagram of the demoulding method for optical lens molding.

[0041] In the figure: 1. upper cover plate; 101. upper mold core; 102. injection flow channel; 103. rectangular groove; 2. bottom plate; 21. lower mold core; 3. demoulding assembly; 31. ejector pin; 32. sliding support plate; 321. curved track; 33. T-shaped block; 34. closed baffle; 35. long plate; 36. switch spring; 4. middle mold; 41. arc plate; 411. switch groove; 42. opening and closing groove; 5. finished lens; 6. thrust assembly; 61. push plate; 62. long rod; 63. pressure plate; 64. rotating rod; 65. pressure block; 66. thrust spring; 7. cavity; 8. compensation spring; 9. telescopic spring; 10. semicircular sliding groove; 11. semicircular slider; 12. square slider; 13. square slide groove. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it is necessary to understand that the terms "middle", "symmetrical", "one end", "flush", "vertical", "horizontal", "upper", "lower", "both sides", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] See also Figures 1 to 4 The present invention provides an optical lens mold, and the technical solution is as follows:

[0045] The bottom plate 2 is fixedly mounted on the workbench by bolts, and the lower mold core 21 is fixedly mounted on the middle part of the upper surface of the bottom plate 2. The shape of the lower mold core 21 is set to be a semicircular convex shape. The middle mold 4 is slidably mounted on the bottom plate 2. The middle mold 4 is composed of two arc plates 41 whose side walls fit each other. The two arc plates 41 can slide to both sides in a limited position in the horizontal direction. When the two arc plates 41 fit together, the inner wall of the arc plate 41 forms a circle. The upper mold core 101 is set to be a semicircular concave shape and is installed inside the upper cover plate 1. The bottom of the upper mold core 101 is flush with the bottom of the upper cover plate 1. The bottom plate 2, the middle mold 4, and the upper cover plate 1 fit each other to form a cavity 7 inside. The molding mold of the finished lens product 5 is divided into three layers. The circle formed when the two arc plates fit together is the side wall shape of the finished lens product 5. The upper mold core 101 cooperates with the lower mold core 21 to form the curved surface of the finished lens product 5. The upper cover plate 1 is provided with a filling Injection channel 102, the injection channel 102 is connected with the cavity 7, and the molten resin is injected into the cavity 7 through the injection channel 102. After the resin is cooled, the finished lens 5 is formed in the inner cavity. The thrust components 6 are symmetrically installed at the joints of the two arc plates 41, and a demolding component 3 is arranged inside the arc plate 41. After the finished lens 5 is formed, pressure is applied to the thrust component 6. The thrust component 6 can open the middle mold 4. During the opening process of the middle mold 4, the demolding component 3 works to eject the finished lens 5 from the lower mold core 21, and the mold is layered. When the optical lens is formed and demolded, the binding force of the optical lens to the mold core is reduced to avoid the Yas phenomenon caused by excessive binding force between the curved surface of the optical lens and the surface of the mold core, which leads to distortion and deformation of the optical lens surface, ghosting and blurring of the imaging, thereby improving the quality and yield of the optical lens and ensuring the qualified rate of the finished optical lens.

[0046] As an embodiment of the present invention, refer to Figures 1 to 8The thrust assembly 6 includes a push plate 61, a long rod 62, a pressure plate 63, a rotating rod 64, a pressure block 65, and a thrust spring 66. The long rod 62 is vertically fixedly installed on the bottom plate 2. A rectangular groove 103 is symmetrically opened inside the upper cover plate 1. An opening and closing groove 42 is provided with two arc plates fitted together. One end of the long rod 62 passes through the opening and closing groove 42 and is located in the rectangular groove 103. The push plates 61 are symmetrically installed on both sides of the inner wall of the opening and closing groove 42 by bolts. A rectangular pressure plate 63 is sleeved on the long rod 62. The pressure plate 63 can slide in a limited position along the axis of the long rod 62 in the vertical direction. Two rotating rods 64 are symmetrically installed on the pressure plate 63. The rotating rod 64 can rotate within the limit position on the pressure plate 63. The other end of the rotating rod 64 The push plate 61 is hingedly connected to the push plate 61. The movement of the pressure plate 63 can drive the push plate 61 to move in the horizontal direction. The thrust spring 66 is vertically wound on the long rod 62. One end of the thrust spring 66 is fixedly connected to the bottom plate 2, and the other end is connected to the bottom of the pressure plate 63. Under the upward thrust of the thrust spring 66, the top of the pressure plate 63 and the top of the opening and closing groove 42 are at the same horizontal position. One end of the pressure block 65 is set to be cylindrical and slidably connected to the long rod 62, and the other end is set to be rectangular and located inside the rectangular groove 103 and fits with the inner wall of the rectangular groove 103. The top of the push plate 61 is flush with the top of the opening and closing groove 42 to prevent the push plate 61 from protruding from the top of the opening and closing groove 42 to affect the molding process of the finished lens 5. When the finished lens product 5 is demolded, a vertical downward pressure is applied to the pressure block 65, and the cylindrical part of the pressure block 65 slides relative to the long rod 62. The pressure block 65 squeezes the pressure plate 63 to make the pressure plate 63 move vertically downward along the axis of the long rod 62. At this time, the rotating rod 64 connected to the pressure plate 63 and the push plate 61 rotates in a limited position. The pressure plate 63 transmits a thrust through the rotating rod 64 to make the push plate 61 move in the direction away from the two sides of the pressure plate 63. The push plate 61 pushes the two fitted arc plates 41 apart, and the inner wall of the arc plate 41 is out of contact with the side wall of the finished lens product 5. At this time, the fitting force between the finished lens product 5 and the side wall of the mold disappears, which makes it easy for the finished lens product 5 to be ejected from the lower mold core 21 when demolding, preventing When the optical lens is demoulded, there is a large bonding force with the inside of the mold, which causes the optical lens to have a surface error, thereby improving the quality of the finished optical lens; two identical telescopic springs 9 are symmetrically installed on the push plate 61, and the telescopic springs 9 are horizontally connected to the two push plates 61 at opposite positions. When pressure is applied to the pressure block 65, the arc plate 41 opens, and the telescopic spring 9 extends. After the pressure is removed, the telescopic spring 9 contracts to automatically close the two arc plates 41. When the pressure plate 63 moves downward to drive the push plate 61 to slide, the spring damping will make the push force of the push plate 61 to both sides more uniform and stable, so that the finished lens 5 is evenly stressed when demoulding, avoiding distortion and deformation of the optical lens curved surface, and ensuring the quality of the finished optical lens;Four symmetrical semicircular sliding grooves 10 are provided on the upper surface of the bottom plate 2. Semicircular sliders 11 are symmetrically provided on the bottom plate 2 of the arc plate 41. The semicircular sliders 11 slide in cooperation with the semicircular sliding grooves 10. A square slider 12 is installed above the arc plate 41. A square sliding groove 13 is provided at the bottom of the upper cover plate 1. The square sliders 12 cooperate with the square sliding grooves 13 to make the arc plate 41 more stable when moving to both sides, thereby improving the demoulding effect of the middle mold 4. When the upper cover plate 1 is reinstalled on the middle mold 4, the cooperation between the square sliders 12 and the square sliding grooves 13 also has a positioning and guiding function. ;

[0047] As an embodiment of the present invention, refer to Figures 1 to 8The demoulding assembly 3 includes an ejector pin 31, a sliding support plate 32, a T-shaped block 33, a closed baffle plate 34, and a switch spring 36. The two T-shaped blocks 33 are symmetrically fixedly installed on the bottom plate 2. The top of the T-shaped block 33 is set to be cylindrical and the T-shaped block 33 is located inside the arc plate 41. The sliding support plate 32 is set inside the arc plate 41 and fits with the inner wall of the arc plate 41. The sliding support plate 32 is located on one side of the T-shaped block 33. A curved track 321 is opened in the sliding support plate 32. The curved track is composed of an arc and a rectangle. The T-shaped block 33 can slide in the curved track 321. When the T-shaped block 33 slides in the curved track 321, the sliding support plate 32 can move in a limited position in the horizontal direction and the vertical direction. The ejector pin 31 is vertically fixedly installed on the sliding support plate The plate 32 is on the arc plate 41, and a U-shaped switch groove 411 is opened on the arc plate 41. The closed baffle plate 34 is horizontally slidably installed in the switch groove 411. A long plate 35 is vertically installed on the side wall of the closed baffle plate 34. One end of the sliding support plate 32 is in contact with the long plate 35. The switch spring 36 is arranged inside the T-shaped block 33 and connected with the long plate 35. When the thrust assembly 6 pushes the arc plate 41 to move to both sides, the arc plate 41 pushes the sliding support plate 32 to approach the T-shaped block 33, and one end of the sliding support plate 32 pushes the long plate 35. The long plate 35 drives the closed baffle plate 34 to enter the arc plate 41. The switch spring 36 gradually extends, and the switch groove 411 is opened. After the switch groove 411 is opened, the top of the T-shaped block 33 begins to enter the curved track 321, and the T-shaped block 33 The sliding support plate 32 does not move in the vertical direction when the T-shaped block 33 slides in the rectangular part. When the T-shaped block 33 slides in the circular part, the sliding support plate 32 gradually moves upward in the vertical direction. The end of the ejector pin 31 extends out of the switch slot 411, exerts a thrust on the edge of the finished lens product 5, and separates the finished lens product 5 from the lower mold core 21. When the arc plate 41 is fitted, the closed baffle plate 34 closes the switch slot 411 to prevent molten resin from falling into the demolding component 3 during the injection molding process. One end of the sliding support plate 32 is fitted with the long plate 35. When the sliding support plate 32 moves, the closed baffle plate 34 is pushed at the first time. At this time, the T-shaped block 33 has not yet moved in the circular arc part of the curved track 321. The push plate 61 pushes the arc plate 41 to open the arc plate 41, and the T-shaped plate slides on the rectangular part of the curved track 321, and the ejector 31 cannot be extended. When the arc plate 41 moves a certain distance, the T-shaped block 33 slides on the circular arc part of the curved track 321, and the T-shaped block 33 drives the sliding support plate 32 to move upward. The ejector 31 is demoulded only after the arc plate 41 is separated from the side wall of the finished lens 5, so as to avoid the ejector 31 from generating a tilting force when applying a thrust to the side wall of the finished lens 5, so that the finished lens 5 is evenly stressed during demoulding, and the optical lens curved surface is prevented from being distorted and deformed, thereby ensuring the qualified rate of the optical lens and improving the uniformity of the thrust of the ejector 31.A compensation spring 8 is sleeved on the ejector pin 31. One end of the compensation spring 8 is connected to the upper surface of the sliding support plate 32, and the other end is connected to the inside of the arc plate 41. The compensation spring 8 applies downward pressure to the sliding support plate 32. After sliding multiple times, friction loss will occur on the surface of the sliding support plate 32. The pressure of the compensation spring 8 makes the sliding support plate 32 close to the surface of the bottom plate 2, achieving the effect of friction loss compensation, improving the service life of the mechanism and ensuring the stable operation of the demolding component 3; the baffle shape is set to be the same as the shape of the switch slot 411, and the thickness is the same as the height of the switch slot 411. During the injection molding process of the optical lens, the closed baffle 34 will not affect the shape of the optical lens. The top of the ejector pin 31 is set to be flush with the bottom of the switch slot 411. When the closed baffle 34 moves to the inside of the arc plate 41 to open the switch slot 411, the ejector pin 31 can extend out of the switch slot 411 in time to perform demolding work, and eject the optical lens out of the lower mold core 21 to avoid distortion of the optical lens surface. ;

[0048] Optical lens molding demoulding method and working principle:

[0049] refer to Figures 1 to 9: When producing optical lenses, the bottom plate 2, the middle mold 4, and the upper cover plate 1 are tightly fitted and installed, and the molten resin is injected into the injection flow channel 102. After the resin cools down, the finished lens 5 is formed in the cavity 7, and the upper cover plate 1 is taken out. The finished lens 5 is separated from the upper mold core 101. At this time, the inner curved surface of the finished lens 5 and the lower mold core 21 still have a fit. At this time, a vertical downward pressure is applied to the rectangular part of the pressure block 65, and the cylindrical part of the pressure block 65 slides relative to the long rod 62. When the pressure block 65 squeezes the pressure plate 63, the pressure plate 63 moves along the long rod 62. The axis direction moves vertically downward. At this time, the rotating rod 64 connected to the pressure plate 63 and the pushing plate 61 simultaneously rotates in a limited position. The pressure plate 63 transmits thrust through the rotating rod 64 to make the pushing plate 61 move in the directions away from both sides of the pressure plate 63. The pushing plate 61 pushes the two fitted arc plates 41 apart. The arc plates 41 slide horizontally on the bottom plate 2. The inner wall of the arc plates 41 is separated from the contact with the side wall of the finished lens 5. At this time, the fitting force between the finished lens 5 and the side wall of the mold disappears. When the thrust assembly 6 pushes the arc plates 41 to move to both sides, the arc plates 41 push The sliding support plate 32 approaches the T-shaped block 33, and one end of the sliding support plate 32 pushes the long plate 35, so that the long plate 35 drives the closed baffle plate 34 to move in the horizontal direction. The switch spring 36 is extended, and the switch slot 411 gradually opens when the closed baffle plate 34 moves toward the inside of the arc plate 41. After the switch slot 411 is opened, the top of the T-shaped block 33 begins to enter the curved track 321, and the T-shaped block 33 slides from the rectangular part to the circular arc part of the curved track 321. When the T-shaped block 33 slides in the circular arc part, the sliding support plate 32 gradually moves due to the influence of the trajectory of the circular arc part. The upper cover plate 1 is moved upward, the compensation spring 8 is compressed, and the end of the ejector pin 31 extends out of the switch slot 411, exerting a thrust on the edge of the finished lens product 5, so that the finished lens product 5 is separated from the lower mold core 21. At this time, there is no fitting force between the finished lens product 5 and the mold, and the finished lens product 5 can be taken out; after the finished lens product 5 is taken out, the arc plate 41 slides on the bottom plate 2 under the action of the telescopic spring 9 and fits again. At this time, the square slide groove 13 of the upper cover plate 1 is buckled into the square slider 12 of the arc plate 41, and the upper cover plate 1 is fitted with the middle mold 4, and the resin can be injected into the injection channel 102 again.

[0050] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. An optical lens mold, characterized in that: The lens comprises an upper cover plate (1), an upper mold core (101), a bottom plate (2), a lower mold core (21), a demoulding assembly (3), an intermediate mold (4), and a finished lens product (5). The lower mold core (21) is fixedly mounted on the middle of the bottom plate (2). The lower mold core (21) is arranged in a semicircular convex shape. The intermediate mold (4) is arranged in the form of two arc-shaped plates (41) whose side walls are fitted together. The two arc-shaped plates (41) can slide on the upper surface of the bottom plate (2) in a limited position. When the two arc-shaped plates (41) are fitted together, the inner wall of the arc-shaped plates (41) forms a circle. The fitting position of the arc-shaped plates (41) is symmetrically provided with a thrust assembly (6). The demoulding assembly (3 ) is installed inside the middle mold (4); when the thrust assembly (6) pushes the arc plate (41), it drives the demoulding assembly (3) to move; the upper mold core (101) is in a semicircular concave shape and is arranged inside the upper cover plate (1); the bottom of the upper mold core (101) is flush with the bottom of the upper cover plate (1); the upper cover plate (1) and the middle mold (4) are fitted and covered; a cavity (7) is formed between the upper cover plate (1), the middle mold (4) and the lower mold core (21); the finished lens product (5) is formed in the cavity (7); the upper cover plate (1) is provided with a perfusion channel (102), and the perfusion channel (102) is connected to the cavity (7).

2. An optical lens mold according to claim 1, characterized in that: The thrust assembly (6) comprises a push plate (61), a long rod (62), a pressure plate (63), a rotating rod (64), a pressure block (65), and a thrust spring (66). A rectangular groove (103) is symmetrically provided inside the upper cover plate (1). The long rod (62) is vertically fixedly installed on the bottom plate (2). One end of the long rod (62) passes through the middle mold (4) and is located in the rectangular groove (103). An opening and closing groove (42) is provided at the joint of the two arc-shaped plates (41). Push plates (61) are symmetrically installed on both sides of the inner wall of the opening and closing groove (42). The pressure plate (63) is horizontally sleeved on the long rod (62). The pressure plate (63) can slide in a vertical direction at an upper limit position. One end of the rotating rod (64) is rotatably connected to the push plate (61), and the other end is rotatably connected to the pressure plate (63). The thrust spring (66) is vertically wound on the long rod (62). One end of the thrust spring (66) is fixedly mounted on the bottom plate (2), and the other end is connected to the bottom of the pressure plate (63). One end of the pressure block (65) is set to be cylindrical, and the pressure block (65) is slidably connected to the long rod (62). The other end of the pressure block (65) is set to be rectangular and located inside the rectangular groove (103) and fits with the inner wall of the rectangular groove (103). When the pressure plate (63) slides downward in the vertical direction, the two push plates (61) will move in the directions away from the two sides of the pressure plate (63).

3. An optical lens mold according to claim 2, characterized in that: The demoulding assembly (3) comprises an ejector pin (31), a sliding support plate (32), a T-shaped block (33), a closed baffle plate (34), and a switch spring (36). The T-shaped block (33) is symmetrically fixedly mounted on the bottom plate (2). The T-shaped block (33) is located inside the arc-shaped plate (41). The top of the T-shaped block (33) is cylindrical. The sliding support plate (32) is arranged inside the arc-shaped plate (41) on one side of the T-shaped block (33). One side of the sliding support plate (32) is in contact with the inner wall of the arc-shaped plate (41). The sliding support plate (32) can be limitedly moved in the horizontal direction and the vertical direction. A curved track (321) is provided inside the sliding support plate (32). The curved track (321) is composed of an arc and a rectangle. The rectangular part is close to the T-shaped block ( The arc-shaped portion is located on one side of the sliding support plate (33), and the top of the rectangular portion is at the same horizontal position as the top of the T-shaped block (33). The arc-shaped portion is close to the arc plate (41) and is connected to the rectangular portion. The arc opening of the arc is facing obliquely upward. The T-shaped block (33) can slide in the curved track (321). The ejector pin (31) is vertically fixedly installed on the sliding support plate (32). The arc plate (41) is provided with a U-shaped switch groove (411). The closed baffle plate (34) is horizontally slidably installed in the switch groove (411). A long plate (35) is vertically installed on the closed baffle plate (34). The long plate (35) is in contact with one end of the sliding support plate (32). One end of the switch spring (36) is fixedly installed on the T-shaped block (33) and the other end is connected to the long plate (35).

4. An optical lens mold according to claim 3, characterized in that: A compensation spring (8) is sleeved on the ejector pin (31), one end of the compensation spring (8) is connected to the inside of the arc plate (41), and the other end is connected to the upper surface of the sliding support plate (32).

5. An optical lens mold according to claim 2, characterized in that: Two identical telescopic springs (9) are symmetrically mounted on the push plate (61), and the telescopic springs (9) connect the two push plates (61) at opposite positions.

6. An optical lens mold according to claim 2, characterized in that: A semicircular sliding groove (10) is provided on the bottom plate (2), a semicircular slider (11) is provided at the bottom of the arc plate (41), the semicircular slider (11) is slidably matched with the semicircular sliding groove (10), a square slider (12) is installed on the arc plate (41), a square sliding groove (13) is provided at the bottom of the upper cover plate (1), the square slider (12) is slidably matched with the square sliding groove (13).

7. An optical lens mold according to claim 3, characterized in that: The closed baffle (34) has the same shape as the switch slot (411), and the thickness of the closed baffle (34) is the same as the height of the switch slot (411), and the top of the ejector pin (31) is flush with the bottom of the switch slot (411).

8. A lens molding and demoulding method of an optical lens mold according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Injecting liquid resin heated to a molten state into the cavity (7) of the mold through the injection channel (102). S2, after the liquid plastic is cooled, the finished lens product (5) is formed in the cavity (7), the upper cover plate (1) is taken out, and the upper mold core (101) is separated from the upper surface of the finished lens product (5). S3, applying pressure to the pressure block (65), the pressure plate (63) moves vertically downward, the rotating rod (64) is displaced to move the push plate (61) to both sides, the push plate (61) pushes the arc plate (41) to open the middle mold (4), and the arc plate (41) is separated from the side wall of the finished lens product (5). S4. During the process of continuously applying pressure, the arc plate (41) moves to drive the sliding support plate (32) to move, one end of the sliding support plate (32) pushes the closed baffle plate (34), the switch spring (36) extends, and the closed baffle plate (34) slides in the switch slot (411). S5. After the sliding support plate (32) moves a certain distance, the T-shaped block (33) cooperates with the curved track (321), the T-shaped block (33) slides in the curved track (321), the sliding support plate (32) slides upward, and the ejector pin (31) extends out of the switch slot (411), exerting a thrust on the bottom of the finished lens product (5). S6, the ejector pin (31) completes the demoulding work, and the bottom of the finished lens product (5) is separated from the lower mold core (21). After the finished lens product (5) is taken out, no pressure is applied to the pressure block (65), and the arc plate (41) is closed again after the telescopic spring (9) contracts.

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