A precise mold for demolding on the fixed mold side and its product

Abstract

The present invention discloses a precise mold for demolding on the fixed mold side, including a fixed mold and a moving mold. The fixed mold includes at least two front mold cores, and a demolding mechanism is installed on the fixed mold; at least two arc-shaped channel-shaped structures with arc-shaped slope transitions at both ends are annularly distributed on the edge of the mirror surface area of the front mold core. There is a clearance position between the arc-shaped channel-shaped structures, and an ejector pin hole is arranged on the clearance position; the demolding mechanism includes at least two ejector pins and an ejecting device installed on one side of the ejector pins. The ejecting device is used to drive the ejector pins to slide telescopically along the ejector pin holes; the present invention also provides a precise optical lens for demolding on the fixed mold side. The present invention installs the demolding mechanism on the fixed mold, effectively solving the deformation problem of optical lenses with ultra-thin, large thickness ratios, and severely curved edges on the fixed mold side during molding and demolding, and ensuring high-precision production of products.

Description

Technical Field

[0001] The present invention relates to the field of mold manufacturing and injection molding of optical lenses, and particularly to a precision mold for demolding on the fixed mold side and its product. Background Art

[0002] With the continuous improvement of the pixel and the continuous reduction of the size of mobile phone cameras, the requirements for mold accuracy are also getting higher and higher. For the existing molds for mobile phone camera lenses, generally ultra-precision machining technologies are adopted for processing. For example, a nano-level single-point diamond ultra-precision machining machine tool is used to process the lens core, and an ultra-precision coordinate grinder is used to process the through holes of the ejector pins. All ultra-precision machining equipment is mobilized to ensure that the mold accuracy is controlled at the micro-nano level. This has greatly improved the injection molding accuracy of mobile phone camera lenses.

[0003] The existing mold technologies basically adopt the method of ejecting on the moving mold side (rear mold), that is, the front mold remains stationary, and during the mold opening process, the cured optical lens and the runner are ejected with ejector pins on the rear mold. Although the ultra-precision machining process of the mold and the modern fully electric-controlled precision injection molding process can ensure the product quality and yield rate of most mobile phone camera lenses, for some special lenses, such as ultra-thin lenses with a thickness within 0.23 mm, and lenses with a large difference in thickness, such as lenses with a very thick center position and a very thin edge position, or lenses with a very thin center position and a very thick edge position, and the thickness ratio exceeds 3 times; in addition, some aspherical lenses have a very sharp curvature at the edge and are relatively steep. For these types of lenses, after injection molding and pressure holding, during the demolding and release process, due to the relatively deep curved surface and steep slope, the bonding force with the surface of the mold core is relatively large. When the fixed mold side (front mold) and the moving mold side (rear mold) are separated and demolded, it often causes the surface shape of the lens to be distorted and deformed, and the two curved surfaces of the lens will both have the problem of AS (i.e., the surface shape error in the X and Y directions is inconsistent), resulting in serious surface shape errors, directly leading to double imaging or blurring in imaging, and a decrease in the resolution of optical imaging.

[0004] Among them, Bert Optoelectronics in Taiwan, China proposed an optical lens and its manufacturing mold in the patent CN201520892820.6. The manufacturing mold is provided with a base, a lower module, an upper module and an injection head. The base is provided with at least three ejector pins. The lower module is provided with a lower mold and a lower mold core. The lower mold core is provided with a lower mold cavity and at least three through holes. Each ejector pin extends into the lower mold cavity through the through hole. The upper module is provided with an upper mold and an upper mold core with an upper mold cavity. When the two mold cavities are abutted, a mold cavity is formed between the two mold cavities. The liquid plastic forms an optical lens in the mold cavity. Each ejector pin simultaneously abuts against the bottom surface of the optical lens, so that the optical lens is uniformly stressed and separated from the lower mold cavity, providing an optical lens and its manufacturing mold with an average force application, not easy to deform and a high yield rate.

[0005] Although the above-mentioned technology solves the problem of uniform force during the demolding and forming of optical lenses, for some ultra-thin lenses with a large difference in thickness ratio or severely curved edges, this technology still cannot solve the distortion and deformation that occur during the mold opening and separation on the fixed mold side (front mold), which is likely to cause serious AS problems (AS, that is, the surface shape error asymmetric in the X and Y directions), resulting in unclear imaging or double images. At the same time, burrs or flash will more or less be generated on the ejector pins, generally as small as a few tenths of a micron at the minimum and up to twenty or thirty microns at the maximum. For mobile phone cameras with extremely high precision requirements, as long as there are burrs or flash with a size of a few tenths of a micron, it will directly affect the assembly parallelism and air gap between the assembly bearing surface of the lens and other lenses. Such influencing factors are major abnormal problems in the field of high-precision optics. Summary of the Invention

[0006] The object of the present invention is to overcome the above-mentioned defects in the prior art, and provides a precision mold for demolding on the fixed mold side with uniform demolding force, high demolding precision, which can effectively eliminate the AS problem of the lens, ensure the assembly precision between each lens, and solve the precision problem of the forming and demolding of ultra-thin and lenses with a large difference in thickness ratio. The present invention also provides an optical lens product for demolding on the fixed mold side that can adapt to the demolding of ultra-thin, lenses with a large difference in thickness ratio, and lenses with severely curved edges and high precision.

[0007] To achieve the above object, the present invention provides a precision mold for demolding on the fixed mold side, including a fixed mold and a moving mold. The fixed mold includes at least two front mold cores, and a demolding mechanism is installed on the fixed mold; at least two arc-shaped channel structures with circular arc slope transitions at both ends are annularly distributed on the edge of the mirror surface area of the front mold core. There is a clearance position between the arc-shaped channel structures, and an ejector pin hole is arranged on the clearance position; the demolding mechanism includes at least two ejector pins and an ejecting device installed on one side of the ejector pins. The ejecting device is used to drive the ejector pins to slide telescopically along the ejector pin holes.

[0008] Preferably, the ejecting device includes an upper fixing plate arranged on the fixed mold, a lower fixing plate fixedly connected to one side of the upper fixing plate, a compression spring arranged on one side of the upper fixing plate, and a return guiding column arranged around the upper fixing plate; the ejector pins are installed on the lower fixing plate.

[0009] Preferably, the distance between the lower fixing plate and the lower front mold fixing plate is between 0.2 mm and 50 mm.

[0010] Preferably, the ejecting device is a spring device, a magnet device, a pneumatic device, a rubber elastic device, or a hydraulic pushing device.

[0011] Preferably, eight front mold cores are arranged on the fixed mold.

[0012] Preferably, the number of the arc-shaped channel structures is three, and they are arranged in a 120° circular pattern at the edge of the mirror surface area on the front mold core.

[0013] Preferably, the surface of the clearance space is a plane or an arc-shaped curved surface.

[0014] Preferably, the cross-sectional contour of the clearance space has slopes and arc transitions on both sides, or is a wavy shape composed of multiple circular arcs.

[0015] Preferably, the surface of the clearance space is higher than the arc-shaped channel structure, and the surface of the clearance space is flush with or close to the flange plane at the edge of the front mold core.

[0016] Preferably, the cross-sectional shape of the ejector pin is circular, square, triangular, polygonal, circular ring-shaped, or asymmetric.

[0017] Preferably, the stationary mold includes a front mold upper fixing plate, a front mold lower fixing plate installed on one side of the front mold upper fixing plate, and an upper template installed on one side of the front mold lower fixing plate;

[0018] The upper fixing plate, the lower fixing plate, and the compression spring are respectively installed between the front mold upper fixing plate and the front mold lower fixing plate. The compression spring is in contact with the front mold upper fixing plate, and the front mold core is installed on the upper template.

[0019] Preferably, the stationary mold further includes insert fixing screws installed on the front mold upper fixing plate. The insert fixing screws pass through the upper fixing plate, the lower fixing plate, and the front mold lower fixing plate and are fixedly connected to the front mold core.

[0020] Preferably, the stationary mold further includes guide rod fixing bolts installed around the upper template, a sprue bushing installed in the middle of the front mold lower fixing plate, a runner connected to the sprue bushing, a gate is provided on the front mold core, and the gate is connected to the runner.

[0021] Preferably, the moving mold includes a rear mold fixing plate, mold feet installed on both sides of the rear mold fixing plate, a support plate installed on one side of the mold feet, a lower template installed on one side of the support plate, and at least two rear mold cores installed on the lower template. The number of the rear mold cores is the same as that of the front mold cores, and the positions of the rear mold cores are adapted to those of the front mold cores.

[0022] Preferably, the moving mold further includes a moving mold side guide rod installed on the mold feet or the support plate, and a sprue ejector pin installed between the rear mold fixing plate and the support plate. One end of the sprue ejector pin penetrates through the support plate and the lower template in sequence.

[0023] Compared with the prior art, the beneficial effects of a precision mold for demolding on the stationary mold side provided by the present invention are as follows:

[0024] The present invention installs the demolding mechanism on the fixed mold, which can effectively solve the deformation problem of ultra-thin, large thickness ratio difference, and severely curved edges of optical lenses on the fixed mold side during molding and demolding, ensuring high-precision production of products;

[0025] The fixed mold includes a front mold core. At least two arc-shaped channel structures with circular arc slope transitions at both ends are annularly distributed on the edge of the mirror surface area of the front mold core. There is a clearance position between the arc-shaped channel structures. The arc-shaped channel structures enable the assembly and bearing surface of the optical lens to have very high precision after demolding, ensuring the assembly precision between lenses. The clearance position can prevent the burrs of the ejector pins from protruding above the lens assembly and bearing surface during demolding, effectively avoiding affecting the assembly parallelism and air gap between the optical lens and other components, and improving the product yield;

[0026] In addition, the demolding mechanism includes at least two ejector pins and an ejection device installed on one side of the ejector pins. The ejection device is used to drive the ejector pins to slide telescopically along the ejector pin holes on the front mold core, so as to eject and demold the product with the ejector pins. The setting of more than two ejector pins can ensure that the optical lens is more evenly stressed during demolding, has very high surface accuracy after demolding, and eliminates the YAS problem caused by the steep surface of the lens.

[0027] The present invention also provides a precision optical lens product for demolding on the fixed mold side, including a mirror surface area with nanoscale precision smoothness on the surface, a flange disk arranged on the outer circle of the mirror surface area. At least two boss structures with circular arc slope transitions at both ends are annularly distributed on the flange disk. There is a glue reduction position with a circular arc slope transition between every two boss structures. The shape characteristics of the boss structures are opposite to those of the arc-shaped channel structures of the front mold core, and the positions and quantities correspond. The shape characteristics of the glue reduction position are opposite to those of the clearance position of the front mold core, and the positions and quantities correspond.

[0028] Preferably, the glue reduction position is lower than the upper surface of the boss structure, the glue reduction position is close to or flush with the plane of the flange disk, and the glue reduction position can contact the ejector pin.

[0029] Preferably, the distance from the boss structure to the flange disk is between 10 and 500 microns.

[0030] Compared with the prior art, the beneficial effects of a precision optical lens product for demolding on the fixed mold side provided by the present invention are as follows:

[0031] This optical lens can adapt to the demolding of ultra-thin, large thickness ratio difference, and severely curved high-precision lenses. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 is the front view of Embodiment 1 provided by the present invention;

[0034] Figure 2 is the top view of Embodiment 1 provided by the present invention;

[0035] Figure 3 is Figure 2 the sectional view at A - A in;

[0036] Figure 4 is Figure 2 the sectional view at B - B in;

[0037] Figure 5 is Figure 2 the sectional view at C - O - C in;

[0038] Figure 6 is Figure 5 the partial enlarged view of View E in;

[0039] Figure 7 is Figure 6 the structural schematic diagram with the front mold core and the rear mold core removed in;

[0040] Figure 8 is the structural schematic diagram of the front mold core in Embodiment 1 provided by the present invention;

[0041] Figure 9 is the bottom view of the front mold core in Embodiment 1 provided by the present invention;

[0042] Figure 10 is the exploded view of Embodiment 1 provided by the present invention;

[0043] Figure 11 is the front view of Embodiment 2 provided by the present invention;

[0044] Figure 12 is the top view of Embodiment 2 provided by the present invention;

[0045] Figure 13 is the structural schematic diagram of Embodiment 2 provided by the present invention. Specific Embodiments

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the scope protected by the present invention.

[0047] Embodiment 1

[0048] All existing mold technologies adopt the method of ejecting from the moving mold side (rear mold), that is, the front mold remains stationary. During the mold opening process of the moving mold side, the ejector pins of the injection molding machine are used to push the upper and lower fixing plates of the ejector pins to eject the already cooled and solidified optical lens and the runner with the ejector pins. Currently, there is no solution for ejecting from the fixed mold side. Embodiment 1 of the present invention proposes the first mold in the industry for ejecting from the fixed mold side for demolding.

[0049] The traditional method of ejecting from the moving mold side has insoluble technical bottlenecks. For some aspherical lenses, the curved surface edge part located on the fixed mold side is severely curved and relatively steep. After injection molding, pressure holding and cooling, during the demolding process, due to the relatively deep curved surface and steep slope on the fixed mold side, the bonding force between it and the surface of the mold core on the fixed mold side is relatively large. When the fixed mold side (front mold) and the moving mold side (rear mold) are separated for demolding, it often causes the surface shape of the lens to be distorted. The two curved surfaces of the lens will both generate astigmatism (AS, and the surface shape errors in the X and Y directions are inconsistent), resulting in serious surface shape errors, directly leading to double imaging or blurring in imaging, and a decrease in the resolution of optical imaging. In addition, there are also some ultra-thin lenses with a thickness within 0.23 mm; or lenses with a large difference in thickness, with a thickness ratio exceeding 3 times. For example, the center position of the lens is very thick, while the edge position of the lens is very thin, or the center position of the lens is very thin while the edge position is very thick. Due to uneven internal stress, warping and deformation are also likely to occur during ejection and demolding. To address these problems, Embodiment 1 of the present invention proposes the first mold in the industry for ejecting from the fixed mold side for demolding, which can enable the optical lens after injection molding to be ejected with balanced force on the fixed mold side, greatly reducing the chance of astigmatism and deformation.

[0050] Such as Figures 1 - 10As shown in the figure, this embodiment provides a precision mold for demolding on the fixed mold side, which includes a fixed mold (or called the front mold) 1 and a moving mold (or called the rear mold) 2. The fixed mold (or called the front mold) 1 includes at least one front mold core 1110, and a demolding mechanism 3 is installed on the fixed mold (or called the front mold) 1; at least two arc-shaped channel structures 1112 with arc-shaped slope transitions at both ends are arranged in a circular distribution on the edge of the mirror surface area of the front mold core 1110. An avoidance space 1115 is arranged between the arc-shaped channel structures 1112, and an ejector pin hole 1113 is arranged on the avoidance space 1115; the demolding mechanism 3 includes at least two ejector pins 1060 and an ejecting device installed on one side of the ejector pins 1060. The ejecting device is used to drive the ejector pins 1060 to slide telescopically along the ejector pin holes 1113.

[0051] Specifically, in the present invention, the demolding mechanism 3 is installed on the fixed mold 1, which can effectively solve the deformation problem of ultra-thin, large thickness ratio, and severely bent edges of optical lenses on the fixed mold side during molding and demolding, and ensure high-precision production of products; the arc-shaped channel structure 1112 enables the assembly bearing surface of the optical lens to have very high precision after demolding, ensuring the assembly precision between each lens. The avoidance space 1115 can prevent the burrs of the ejector pins 1060 from protruding above the lens assembly bearing surface during demolding, effectively avoiding affecting the assembly parallelism and air gap between the optical lens and other components, and improving the product yield; the ejecting device is used to drive the ejector pins 1060 to slide telescopically along the ejector pin holes 1113 on the front mold core 1110, and then the ejector pins 1060 eject and demold the product. The arrangement of more than two ejector pins 1060 can ensure that the optical lens is more evenly stressed during demolding, has very high surface shape precision after demolding, and eliminates the astigmatism problem caused by the steep surface shape of the lens.

[0052] Further, on the edge of the mirror surface area of the front mold core 1110, there are three arc-shaped channel structures 1112 distributed in a ring, with arc-shaped slopes at both ends for transition. They are arranged in a 120° ring on the edge of the mirror surface area of the front mold core 1110. There is a clearance space 1115 between every two arc-shaped channel structures 1112. Therefore, there are three clearance spaces 1115 on the front mold core 1110. Each clearance space 1115 is provided with an ejector pin hole 1113, and the ejector pin holes 1113 are arranged at intervals of 120°. Three ejector pins 1060 pass through the three ejector pin holes 1113 respectively. The upper part of the ejector pin 1060 is thicker and the lower part is thinner. The thinner end of it contacts the flange edge of the optical lens. The center of the lower surface of the front mold core 1110 is recessed to form a cavity 1111, which is a nano-level optical surface processed by single-point diamond ultra-precision machining. The moving mold 2 includes a rear mold core 1150, which faces the front mold core 1110. The rear mold core 1150 is not provided with ejector pin holes 1113. The ejection action of the lens is completed by the ejector pin 1060 on the fixed mold side. The optical lens 1130 is formed in the cavity (hollow cavity) between the front mold core 1110 and the rear mold core 1150. The surface profiles of the upper and lower surfaces of the optical lens are exactly the same as the cavity surfaces of the front and rear mold cores.

[0053] Furthermore, the surface of the clearance space 1115 is a plane or an arc-shaped curved surface; the cross-sectional profile of the clearance space 1115 has slopes and arc transitions on both sides, or is a wavy shape composed of multiple arc segments; the surface of the clearance space 1115 is higher than the arc-shaped channel structure 1112, and the surface of the clearance space 1115 is flush with or close to the flange plane of the edge of the front mold core 1110; the cross-sectional shape of the ejector pin 1060 can be circular, square, triangular, polygonal, circular ring-shaped, or asymmetric.

[0054] The ejection device includes an upper fixing plate 1040 arranged on the fixed mold 1, a lower fixing plate 1070 fixedly connected to the upper fixing plate 1040, a compression spring 1030 arranged on one side of the upper fixing plate 1040, and return guide columns 1050 arranged around the upper fixing plate 1040. The ejector pin 1060 is installed on the lower fixing plate 1070. Specifically, 4 compression springs 1030 are arranged in the counterbore under the front mold upper fixing plate 1020. During demolding, under the action of the self-elastic force of the compression springs 1030, the upper fixing plate 1040 is pushed towards the lower fixing plate 1070, thereby pushing the ejector pin 1060 to smoothly eject the optical lens 1130. In addition, the distance between the lower fixing plate 1070 and the front mold lower fixing plate 1090 is 0.2 mm - 50 mm, and this distance is the stroke of the ejector pin 1060.

[0055] Of course, the ejection device can also be a spring device, a magnet device, a pneumatic device, an elastic glue device, or a hydraulic pushing device.

[0056] The stationary mold 1 includes a front mold upper fixing plate 1020, a front mold lower fixing plate 1090 installed on one side of the front mold upper fixing plate 1020, an upper template 1120 installed on one side of the front mold lower fixing plate 1090, insert fixing screws 1010 installed on the front mold upper fixing plate 1020, guide rod fixing bolts 1100 installed around the upper template 1120, a sprue bushing 1080 installed in the middle of the front mold lower fixing plate 1090, and a runner 1139 communicating with the sprue bushing 1080.

[0057] Specifically, the upper fixing plate 1040, the lower fixing plate 1070, and the compression spring 1030 are respectively installed between the front mold upper fixing plate 1020 and the front mold lower fixing plate 1090. The compression spring 1030 is in contact with the front mold upper fixing plate 1020. The front mold core 1110 is installed on the upper template 1120. The insert fixing screws 1010 pass through the upper fixing plate 1040, the lower fixing plate 1070, and the front mold lower fixing plate 1090 and are fixedly connected to the front mold core 1110. A glue inlet 1114 is provided on the front mold core 1110, and the glue inlet 1114 communicates with the runner 1139. The front mold core 1110 is located in the through hole of the upper template 1120 and is fixed to the front mold upper fixing plate 1020 by the insert fixing screws 1010. The number of the front mold cores 1110 is more than two. In order to improve production efficiency, the number of the front mold cores 1110 in this specific implementation plan is preferably eight, and the eight front mold cores 1110 are arranged in a circular array on the upper template 1120.

[0058] In addition, the moving mold 2 includes a rear mold fixing plate 1190, mold feet 1180 installed on both sides of the rear mold fixing plate 1190, a support plate 1170 installed on one side of the mold feet 1180, a lower template 1140 installed on one side of the support plate 1170, at least two rear mold cores 1150 installed on the lower template 1140, a moving mold side guide rod 1160 installed on the mold feet 1180 or the support plate 1170, and a gate ejector pin 1260 installed between the rear mold fixing plate 1190 and the support plate 1170. The moving mold side guide rod 1160 is slidably connected to the guide rod fixing bolt 1100.

[0059] Specifically, the number of the rear mold cores 1150 is the same as that of the front mold cores 1110, and the positions of the rear mold cores 1150 are adapted to those of the front mold cores 1110. In this specific implementation, it is preferably that the number of the front mold cores 1110 is eight. Since the optical lens is ejected and demolded from the fixed mold side, ejector pins are not provided on the rear mold cores 1150. The optical lens 1130 is formed in the cavity (i.e., the cavity) between the front mold core 1110 and the rear mold core 1150. The surface profiles of the upper and lower surfaces of the optical lens 1130 are exactly the same as those of the front and rear mold cores. The cavity surfaces of the front mold core 1110 and the rear mold core 1150 are both processed by nano-scale single-point diamond ultra-precision machining to ensure that the accuracy of the lens surface profile after injection molding reaches the nano-scale of a super mirror surface. Multiple optical lenses 1130 are connected to each other through a runner 1139.

[0060] During injection molding, the liquid plastic heated to the molten state enters the runner 1139 and each cavity through the hole in the middle of the sprue bushing 1080, and forms the optical lens 1130 product after pressure holding and cooling and solidification. One end of the gate ejector pin 1260 penetrates through the support plate 1170 and the lower template 1140 in sequence to contact the runner 1139 and cool the runner 1139. When the optical lens 1130 is cooled after injection molding, during the process of the injection molding machine pulling the moving mold 2 to demold, the gate ejector pin 1260 ejects the cooled runner 1139 to separate it. Since the surface profile of the optical lens 1130 on the fixed mold 1 is relatively curved and steep, it has a large surface adhesion force after cooling and adheres to the cavity surface of the front mold core 1110 of the fixed mold 1. The cooled optical lens 1130 is simultaneously ejected and demolded through the ejector pins 1060 on the ejector device. When the ejector pins 1060 eject the optical lens 1130, the return guide posts 1050 protrude from the parting surface of the upper template 1120 at the same time. After the optical lens 1130 is demolded, the injection molding machine pushes the moving mold 2 to close with the fixed mold 1. The parting surface of the lower template 1140 located on the moving mold 2 pushes the return guide posts 1050 to reset. The return guide posts 1050 push the ejector pins 1060 of the fixed mold 1 to return to the original position, and at the same time, the return guide posts 1050 also drive the compression spring 1030 to compress and reset.

[0061] Embodiment 2

[0062] As Figures 11 - 13As shown, the present invention also provides a precision optical lens product for demolding on the fixed mold side, including a mirror surface area 91 with a smooth surface at the nanometer precision level, and a flange disk 92 arranged in a circle outside the mirror surface area 91. At least two boss structures 93 with circular arc slope transitions at both ends are arranged on the flange disk 92 in a circular distribution. A glue reduction position 94 with a circular arc slope transition is arranged between every two boss structures 93. The shape characteristics of the boss structure 93 are opposite to those of the arc-shaped channel structure 1112 of the front mold core, and the positions and quantities correspond. The shape characteristics of the glue reduction position 94 are opposite to those of the clearance position 1115 of the front mold core, and the positions and quantities correspond.

[0063] The glue reduction position 94 is lower than the upper surface of the boss structure 93. The glue reduction position 94 is close to or flush with the plane of the flange disk 92. The glue reduction position 94 can be in contact with the ejector pin 1060.

[0064] Specifically, in this embodiment, the boss structure 93 is close to the side of the mirror surface area 91 that bulges in the middle and is arranged in a circle on the flange disk 92. The boss structure 93 is the assembly support surface of the lens, which is used to ensure the position accuracy when assembled with other lenses or components (such as mylar sheets, spacers). The boss structure 93 protrudes 15 to 100 micrometers above the end face of the flange disk 92. In this implementation, it is preferably that the distance between the boss structure 93 and the flange disk 92 is 35 micrometers.

[0065] When the ejector pin 1060 is retracted after demolding, even if there are flashings, since the glue reduction position 94 is lower than the assembly support surface of the optical lens, the flashings and defects caused by the ejector pin 1060 will not affect the assembly accuracy of the optical lens. It will not affect the assembly parallelism and air gap between the lens assembly support surface and other lenses, improving the injection molding accuracy and qualification rate of the product. This optical lens product can adapt to the demolding of ultra-thin, lenses with a large difference in thickness ratio, and lenses with a severely curved edge and high precision.

[0066] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A precision mold for demolding on the fixed mold side, comprising a fixed mold (1) and a movable mold (2), characterized in that, The stationary mold (1) includes at least two front mold cores (1110), and a demolding mechanism (3) is installed on the stationary mold (1); On the edge of the mirror surface area of the front mold core (1110), there are at least two arc-shaped channel structures (1112) distributed in a ring with arc-shaped slope transitions at both ends. There is a clearance space (1115) between the arc-shaped channel structures (1112), and ejector pin holes (1113) are arranged on the clearance space (1115); The demolding mechanism (3) includes at least two ejector pins (1060), and an ejecting device installed on one side of the ejector pin (1060). The ejecting device is used to drive the ejector pin (1060) to slide telescopically along the ejector pin hole (1113); The ejecting device includes an upper fixing plate (1040) arranged on the stationary mold (1), a lower fixing plate (1070) fixedly connected to one side of the upper fixing plate (1040), a compression spring (1030) arranged on one side of the upper fixing plate (1040), and return guide columns (1050) arranged around the upper fixing plate (1040); The ejector pin (1060) is installed on the lower fixing plate (1070); The stationary mold (1) includes a front mold upper fixing plate (1020), a front mold lower fixing plate (1090) installed on one side of the front mold upper fixing plate (1020), and an upper template (1120) installed on one side of the front mold lower fixing plate (1090); The upper fixing plate (1040), the lower fixing plate (1070) and the compression spring (1030) are respectively installed between the front mold upper fixing plate (1020) and the front mold lower fixing plate (1090). The compression spring (1030) is in contact with the front mold upper fixing plate (1020), and the front mold core (1110) is installed on the upper template (1120); The stationary mold (1) further includes insert fixing screws (1010) installed on the front mold upper fixing plate (1020). The insert fixing screws (1010) pass through the upper fixing plate (1040), the lower fixing plate (1070) and the front mold lower fixing plate (1090) and are fixedly connected to the front mold core (1110); The stationary mold (1) further includes guide rod fixing bolts (1100) installed around the upper template (1120), a sprue bushing (1080) installed in the middle of the front mold lower fixing plate (1090), a runner (1139) communicating with the sprue bushing (1080). An injection port (1114) is arranged on the front mold core (1110), and the injection port (1114) communicates with the runner (1139); The moving mold (2) includes a rear mold fixing plate (1190), mold feet (1180) installed on both sides of the rear mold fixing plate (1190), a support plate (1170) installed on one side of the mold feet (1180), a lower template (1140) installed on one side of the support plate (1170), and at least two rear mold cores (1150) installed on the lower template (1140). The number of the rear mold cores (1150) is the same as that of the front mold cores (1110), and the positions of the rear mold cores (1150) are adapted to those of the front mold cores (1110); The moving mold (2) further includes a moving mold side guide rod (1160) installed on the mold feet (1180) or the support plate (1170), and a sprue ejector pin (1260) installed between the rear mold fixing plate (1190) and the support plate (1170). One end of the sprue ejector pin (1260) penetrates through the support plate (1170) and the lower template (1140) successively. During injection molding, the liquid plastic heated to the molten state enters the runner (1139) and each cavity through the hole in the center of the sprue bushing (1080), and forms the optical lens (1130) product after pressure holding, forming and cooling and solidifying.

2. The precision mold for demolding on the fixed mold side according to claim 1, wherein The distance between the lower fixing plate (1070) and the front lower mold fixing plate (1090) is between 0.2 mm and 50 mm.

3. A precise mold for demolding on the fixed mold side according to claim 1, characterized in that, The ejecting device is a spring device, a magnet device, a pneumatic device, a rubber elastic device, or a hydraulic pushing device.

4. A precision mold for demolding on the fixed mold side according to claim 1, characterized in that, Eight front mold cores (1110) are arranged on the fixed mold (1).

5. A precise mold for demolding on the fixed mold side according to claim 1, characterized in that, The number of the arc-shaped channel structures (1112) is three, and they are arranged in a 120° circular arrangement on the edge of the mirror area of the front mold core (1110).

6. A precise mold for demolding on the fixed mold side according to claim 1, characterized in that, The surface of the clearance space (1115) is a plane or an arc-shaped curved surface.

7. A precision mold for demolding on the fixed mold side according to claim 1, characterized in that, The cross-sectional contour of the clearance space (1115) has slopes on both sides with arc transitions, or is a wavy shape composed of multiple circular arcs.

8. A precision mold for demolding on the fixed mold side according to claim 1, characterized in that, The surface of the clearance space (1115) is higher than the arc-shaped channel structure (1112), and the surface of the clearance space (1115) is flush with or close to the flange plane at the edge of the front mold core (1110).

9. A precise mold for demolding on the fixed mold side according to claim 1, characterized in that, The cross-sectional shape of the ejector pin (1060) is circular, polygonal, circular ring-shaped, or asymmetric.

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