Optical lens barrel plastic mold

Abstract

The present application discloses a plastic mold for an optical lens barrel, comprising a movable side mold core, a slider group and a fixed side mold core connected in sequence, wherein the movable side mold core is a truncated cone-shaped boss on the side close to the slider group, the boss is provided with an assembly groove, and the middle of the boss is provided with a center hole penetrating the movable side mold core; the slider group is fitted with the assembly groove, the slider group comprises a plurality of sliders, each of which extends from the edge of the boss to the middle of the boss, and each of which is in the shape of a quadrangular pyramid on the side close to the middle of the boss, the top of the quadrangular pyramid has an inwardly sunken arc-like surface, and the sides of all sliders with the arc-like surface are abutted and connected to form a ring, the middle of the ring is a slurry inlet hole corresponding to the center hole, and the periphery of the slider group is connected with a locking ring; the fixed side mold core comprises a first main body and a top support arranged on one side of the first main body, and the other side of the first main body is connected to the slurry inlet hole. The present application can effectively eliminate the gap change caused by thermal expansion, improve positioning accuracy, have good stability, and stable mass production yield.

Description

Technical Field

[0001] The present application belongs to the technical field of injection molds, and specifically relates to a plastic mold for an optical lens barrel. Background Art

[0002] With the development of camera technology, lens modules are widely used in camera devices for various purposes. The combination of lens modules with various portable electronic devices such as mobile phones and computers is more favored by many consumers. A lens module usually includes a lens barrel, an optical element housed in the lens barrel, and a lens mount and electronic parts connected thereto.

[0003] The lens barrel in the lens module is generally made of plastic parts, which are manufactured and mass-produced using plastic injection molding technology; the design of the high-pixel lens module often uses a combination of multiple lenses inside the lens barrel, and the outside of the lens barrel is connected to the lens holder by screws, which is responsible for both focusing and connecting with electronic components. It is necessary to ensure the various dimensional parameters of the lens barrel itself and to coordinate with other components.

[0004] In the prior art, the core of the lens barrel mold used when the lens barrel is plastic consists of three parts: a fixed side mold core, a movable side mold core, and a slider. These three parts move repeatedly during the molding process. During the molding of the plastic lens barrel, the temperature of the mold parts will rise to over 100°C. Due to the uncertainty of thermal expansion, the gap between the mold parts will change, resulting in mold positioning accuracy errors, mold relative position deterioration, reduced stability, and ultimately unstable mold production.

[0005] The error caused by thermal expansion of the mold often exceeds the tolerance range allowed by the optical design system, resulting in serious problems such as poor lens resolution and low production yield. Summary of the invention

[0006] The present application provides a plastic mold for an optical lens barrel, which can effectively eliminate gap changes caused by thermal expansion, improve positioning accuracy, and has good stability and stable mass production yield.

[0007] In order to achieve the above purpose, the technical solution adopted by this application is:

[0008] A plastic mold for an optical lens barrel, comprising a movable side mold core, a slider group and a fixed side mold core connected in sequence.

[0009] The movable side mold core is a truncated cone-shaped boss on the side close to the slider group, the boss is provided with a mounting groove, and the middle of the boss is provided with a center hole penetrating the movable side mold core;

[0010] The slider group is fitted and mounted in the assembly groove, and the slider group includes a plurality of sliders, each of which extends from the edge of the boss to the middle of the boss, and each of which is in the shape of a quadrangular pyramid on the side close to the middle of the boss, and the top of the quadrangular pyramid has an inwardly sunken arc-like surface, and the sides of all the sliders with the arc-like surface are abutted and connected to form a ring, and the middle of the ring is a slurry inlet hole corresponding to the center hole, and the periphery of the slider group is connected with a locking ring;

[0011] The fixed side mold core includes a first main body and a top support arranged on one side of the first main body, and the other side of the first main body is correspondingly connected to the slurry inlet hole.

[0012] Preferably, the optical lens barrel plastic mold further comprises a movable side insert, which penetrates into the central hole from the side of the movable side mold core away from the slider group, and extends to the slurry entry hole and then abuts against the fixed side mold core;

[0013] The movable side insert is in contact with the inner wall of the central hole, and a gap is provided between the movable side insert and the inner wall of the pulp inlet hole, and the gap serves as a molding hole for the lens barrel plastic.

[0014] Preferably, a first flow channel penetrating the first main body and the top support is provided on the fixed side mold core, and the first flow channel is connected to an end of the forming hole close to the fixed side mold core.

[0015] Preferably, a second flow channel penetrating through the first main body and the top support is provided on the fixed side mold core, and the second flow channel is closer to the outer edge of the first main body than the first flow channel;

[0016] A guide hole corresponding to the second flow channel is provided at the abutting position of two adjacent sliders, and the guide hole is provided with a gate connected to the molding hole, and the gate is located at one end of the molding hole close to the movable side mold core.

[0017] Preferably, the top support is provided with a plurality of first exhaust grooves, and each first exhaust groove is correspondingly connected to the first flow channel or the second flow channel.

[0018] Preferably, the assembly groove is cross-shaped, the intersection of the cross corresponds to the center hole, and the outer wall of the cross extends from the intersection to the outer edge of the boss; the sliders are four, and each slider is embedded in correspondence with the outer wall of the cross.

[0019] Preferably, a pressing block is connected to the boss, and a step structure is provided on the side of each sliding block, and the pressing block abuts against the step structure.

[0020] Preferably, the number of the sliding blocks is 3, 4 or more than 4.

[0021] Preferably, the locking ring is annular, the inner wall of the locking ring abuts against the outer wall of the slider and the outer wall of the boss, and a first oil channel is provided on the inner wall of the locking ring, and a lubricant is provided in the first oil channel.

[0022] Preferably, each of the sliders is provided with an inclined hole, and an inclined guide column is connected to the inclined hole. One end of the inclined guide column is connected to the top support of the fixed side mold core, and the other end of the inclined guide column is abutted against the inner wall of the inclined hole. When the fixed side mold core moves upward, the inclined guide column drives each slider to move outward and apart.

[0023] The optical lens barrel plastic mold provided by the present application uses the principle of mutual tightening of cones to maintain the angle of the cone unchanged when deformed by heat, thereby effectively eliminating the gap change caused by thermal expansion and improving the positioning accuracy; the movable side mold core, the slider and the fixed side mold core are limited by the hole position, and the locking ring can be used to complete self-positioning correction during the mold movement process, thereby improving the stability of the mold and stabilizing the mold mass production yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the plastic mold of the optical lens barrel of the present application;

[0025] Figure 2 A cross-sectional view of a plastic mold for an optical lens barrel of the present application;

[0026] Figure 3 This is a schematic diagram of the structure of the movable side mold core of this application;

[0027] Figure 4 A top view of the movable side mold core of this application;

[0028] Figure 5 for Figure 4 Cross-sectional view of the middle AA part;

[0029] Figure 6 This is a schematic diagram of the structure of the movable side entry of this application;

[0030] Figure 7 for Figure 6 A partial enlarged view of part a in the middle;

[0031] Figure 8 This is a schematic diagram of the structure of the slider group of this application;

[0032] Fig. 9 This is a schematic diagram of the structure of the first slider of the present application;

[0033] Fig.10 This is a schematic diagram of the structure of the first slider of the present application close to the movable side mold core;

[0034] Fig.11 A cross-sectional view of the first slider of the present application;

[0035] Fig.12 This is a schematic diagram of the structure of the second slider of this application;

[0036] Fig.13 This is a schematic diagram of the structure of the second slider of the present application close to the movable side mold core;

[0037] Fig.14 A cross-sectional view of the second slider of the present application;

[0038] Fig.15 This is a schematic diagram of the structure of the third slider of this application;

[0039] Fig.16 This is a schematic diagram of the structure of the third slider of the present application close to the movable side mold core;

[0040] Fig.17 A cross-sectional view of a third slider of the present application;

[0041] Fig.18 This is a schematic diagram of the structure of the fourth slider of the present application;

[0042] Fig.19 This is a schematic structural diagram of the fourth slider of the present application close to the movable side mold core;

[0043] Fig. 20 A cross-sectional view of a fourth slider of the present application;

[0044] Fig.21 This is a schematic diagram of the structure of the locking ring of this application;

[0045] Fig. 22 for Fig.21 Cross-sectional view of the CC section;

[0046] Fig.23 A top view of the fixed side mold core of this application;

[0047] Fig.24 This is a bottom view of the fixed side mold core of this application;

[0048] Fig.25 for Fig.24 Cross-sectional view of the middle DD part;

[0049] Fig.26 for Fig.24 Cross-sectional view of the BB part.

[0050] In the figure: 1, fixed side mold core; 101, top support; 102, first main body; 103, first exhaust groove; 104, first mounting hole; 105, U-shaped hole; 106, injection port; 107, connecting groove; 108, first flow channel; 109, second flow channel; 110, first exhaust hole; 111, second exhaust groove; 2, slider group; 201, first slider; 202, second slider; 203, third slider; 204, fourth slider; 205, second mounting hole; 206, guide hole; 207, slurry inlet hole; 208, inclined hole; 209, gate; 210, first type of arc surface; 211, second type of arc surface; 213 , third type of cambered surface; 214, fourth type of cambered surface; 215, third exhaust groove; 216, fourth exhaust groove; 217, dividing hole; 218, step structure; 3, locking ring; 301, first oil channel; 4, movable side mold core; 401, boss; 402, second main body; 403, assembly groove; 404, center hole; 405, third mounting hole; 406, fifth exhaust groove; 407, second exhaust hole; 408, fourth mounting hole; 5, movable side insert; 501, screw hole; 502, longitudinal exhaust hole; 503, transverse exhaust hole; 504, second oil channel; 6, inclined guide column; 7, bushing; 8, forming hole; 9, pressing block. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] It should be noted that when a component is referred to as being “connected” to another component, it may be directly connected to the other component or there may be a central component; when a component is referred to as being “fixed” to another component, it may be directly fixed to the other component or there may be a central component.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0054] like Figures 1-2 As shown, in one embodiment, a plastic mold for an optical lens barrel is provided, comprising a movable side mold core 4, a slider group 2 and a fixed side mold core 1 which are connected in sequence.

[0055] The movable side mold core 4 is a truncated cone-shaped boss on the side close to the slider group 2 . The boss is provided with a mounting groove, and a center hole penetrating the movable side mold core 4 is provided in the middle of the boss.

[0056] The slider group 2 is embedded in the assembly groove, and the slider group 2 includes multiple sliders. Each slider extends from the edge of the boss to the middle of the boss, and each slider is in the shape of a quadrangular pyramid on the side close to the middle of the boss. The top of the quadrangular pyramid has an inward-concave arc-like surface. All the sliders have a side with a arc-like surface that is abutted and connected to form a ring. The middle of the ring is a slurry inlet hole corresponding to the center hole. The outer periphery of the slider group 2 is connected with a locking ring 3.

[0057] The fixed side mold core 1 includes a first main body and a top support arranged on one side of the first main body, and the other side of the first main body is correspondingly connected to the slurry inlet hole.

[0058] The optical lens barrel plastic mold provided in this embodiment uses the principle of mutual tightening of cones to keep the angle of the cone unchanged when deformed by heat, thereby effectively eliminating the gap caused by thermal expansion and improving the positioning accuracy; the movable side mold core 4, the slider and the fixed side mold core 1 are limited by the hole position, and the locking ring can be used to complete self-positioning correction during the mold movement process, thereby improving the stability of the mold and stabilizing the mold mass production yield.

[0059] like Figures 3 to 5 As shown, the movable side mold core 4 includes a second body 402 and the boss 401 disposed on the second body 402, and the assembly groove 403 on the boss 401 is formed by the top surface of the boss 401 (the top surface is Figure 3 In one embodiment, the assembly groove 403 is cross-shaped, the intersection of the cross corresponds to the center hole 404, and the outer wall of the cross extends from the intersection to the outer edge of the boss 401.

[0060] A plurality of third mounting holes 405 and four fifth exhaust grooves 406 are provided on the bottom surface of the assembly groove 403. The fifth exhaust grooves 406 are used to exhaust air in the mold during plastic molding to avoid affecting the flow of the plastic fluid. Each fifth exhaust groove 406 is connected to a second exhaust hole 407, which is arranged side by side with the center hole 404 and passes through the movable side mold core 4.

[0061] In one embodiment, a logo may be disposed in the fifth exhaust groove 406 to facilitate orderly installation of the slider.

[0062] The boss 401 is composed of four independent convex blocks except the indented assembly groove 403 . A fourth mounting hole 408 is provided on the top surface of each convex block, and a pressing block 9 is connected through the fourth mounting hole 408 .

[0063] like Figures 6-7As shown, the optical lens barrel plastic mold further includes a movable side insert 5, which penetrates into the center hole 404 from the side of the movable side mold core 4 away from the slider group 2, and extends to the slurry entry hole to abut against the fixed side mold core 1.

[0064] The L3 section of the movable side insert 5 is exposed outside the movable side mold core 4; the L2 section of the movable side insert 5 is in contact with the inner wall of the center hole 404, and a gap is provided between the L1 section of the movable side insert 5 and the inner wall of the slurry inlet hole, and the gap serves as a molding hole 8 for the lens barrel plastic.

[0065] In order to achieve the insertion and withdrawal of the movable side inserter 5, a screw hole 501 is provided at the bottom of the movable side inserter 5, and the screw hole 501 is connected to an external power mechanism for controlling the movement of the movable side inserter 5.

[0066] Furthermore, a longitudinal exhaust hole 502 and a transverse exhaust hole 503 are provided on the movable side inlet 5 to exhaust air from the bottom of the mold.

[0067] The outer wall of the portion (i.e., L2 segment) where the movable side insert 5 abuts against the inner wall of the center hole 404 is provided with a second oil passage 504, and lubricant is provided in the second oil passage 504 to reduce the friction between the movable side insert 5 and the center hole 404 and reduce component loss. In one embodiment, the maximum depth of the second oil passage 504 is 0.15 mm.

[0068] like Figure 8 As shown, in one embodiment, the slider group 2 is provided with four sliders, namely, the first slider 201, the second slider 202, the third slider 203 and the fourth slider 204. The quadrangular pyramidal parts of each slider are abutted and connected, so that the slider group 2 as a whole forms a cross-shaped structure, and each slider is correspondingly embedded in the cross-shaped outer wall of the assembly groove 403. In order to facilitate the orderly installation of the sliders, a number corresponding to the logo in the assembly groove 403 of the movable side mold core 4 can be set on the slider.

[0069] All the sliders are matched with two inclined surfaces in the quadrangular pyramid, and at the same time, the tail cone surface brought by the locking ring 3 is tightened to maintain the overall uniform action and ensure the consistency and stability of the front end forming part. If the front end forming (i.e. forming in the forming hole 8) is a cylindrical product, the roundness and coaxiality of the product will be better.

[0070] The abutment area between two adjacent sliders is provided with a guide hole 206, which penetrates the slider group 2 and has a gate on the guide hole 206. Figure 8 The visible surface is the front side) and is provided with a recessed area. The recessed areas of the four sliders are spliced ​​to form a positioning groove for positioning and installing the fixed side mold core 1. The positioning groove can improve the assembly stability between the fixed side mold core 1 and the slider group 2.

[0071] Each slider is provided with a second mounting hole 205, and the second mounting hole 205 and the third mounting hole 405 of the movable side mold core 4 are used to realize positioning and assembly of the two, thereby improving positioning accuracy.

[0072] like Figures 9-11 As shown, the top of the quadrangular pyramid of the first slider 201 (with Fig. 9 The orientation shown is for reference) is indented to form a first type of arc surface 210. Here, the arc surface should be understood as the indented portion having an extension trend of the arc surface as a whole, but not strictly an arc surface. The specific structure of the first type of arc surface 210 depends on the structure of the desired plastic lens barrel.

[0073] A fourth exhaust groove 216 is provided on one side of the first slider 201 close to the movable side mold core 4. The fourth exhaust groove 216 is provided on the side close to the arc-like surface, and in order to better exhaust the air in the mold, the fourth exhaust groove 216 is connected to the third exhaust groove 215, and the third exhaust groove 215 extends from the fourth exhaust groove 216 to the side away from the arc-like surface. In one embodiment, in order to achieve a better assembly effect between the sliders, the splicing angle α of the quadrangular pyramid of the first slider 201 is set to 83°.

[0074] In one embodiment, a step structure 218 is provided on the side of the first slider 201, and the pressing block 9 connected to the top of the protrusion of the movable side mold core 4 through the fourth mounting hole 408 abuts against the step structure 218. Specifically, the edge of the pressing block 9 is pressed against the step structure 218 to prevent the first slider 201 from shifting up and down during horizontal separation or convergence movement.

[0075] Considering the convenience of mold processing and the subsequent modification of the mold, a dividing hole 217 is provided on the first slider 201 , and a positioning dividing block is embedded in the dividing hole 217 for positioning the movable side insert 5 .

[0076] In one embodiment, an inclined hole 208 is provided on the first slider 201, and an inclined guide column 6 is connected to the inclined hole 208. One end of the inclined guide column 6 is connected to the top support 101 of the fixed side mold core 1, and the other end of the inclined guide column 6 is abutted against the inner wall of the inclined hole 208. When the fixed side mold core 1 moves upward, the inclined guide column 6 drives the first slider 201 to move outward and apart, and when the fixed side mold core 1 moves downward, the inclined guide column 6 drives the first slider 201 to move inward and converge.

[0077] like Figures 12-14 As shown, the top of the quadrangular pyramid of the second slider 202 (with Fig.12 The orientation shown is for reference) is indented to form a second type of arc surface 211. The specific structure of the second type of arc surface 211 depends on the structure of the desired plastic lens barrel.

[0078] A fourth exhaust groove 216 is provided on a side of the second slider 202 close to the movable side mold core 4. The fourth exhaust groove 216 is provided on a side close to the arc-like surface, and in order to better exhaust the air in the mold, the fourth exhaust groove 216 is connected to the third exhaust groove 215, and the third exhaust groove 215 extends from the fourth exhaust groove 216 to the side away from the arc-like surface. In one embodiment, in order to achieve a better assembly effect between the sliders, the quadrangular pyramid splicing angle β of the second slider 202 is set to 97°.

[0079] In one embodiment, a step structure 218 is provided on the side of the second slider 202, and the pressing block 9 on the movable side mold core 4 abuts against the step structure 218. Specifically, the edge of the pressing block 9 is pressed against the step structure 218 to prevent the second slider 202 from shifting up and down during horizontal separation or convergence movement.

[0080] In one embodiment, an inclined hole 208 is provided on the second slider 202, and an inclined guide column 6 is connected to the inclined hole 208. One end of the inclined guide column 6 is connected to the top support 101 of the fixed side mold core 1, and the other end of the inclined guide column 6 is abutted against the inner wall of the inclined hole 208. When the fixed side mold core 1 moves upward, the inclined guide column 6 drives the second slider 202 to move outward and apart. When the fixed side mold core 1 moves downward, the inclined guide column 6 drives the second slider 202 to move inward and converge.

[0081] like Figures 15 to 17 As shown, the top of the quadrangular pyramid of the third slider 203 (with Fig.15 The orientation shown is for reference) is indented to form a third type of arc surface 213. The specific structure of the third type of arc surface 213 depends on the structure of the desired plastic lens barrel.

[0082] A fourth exhaust groove 216 is provided on one side of the third slider 203 close to the movable side mold core 4. The fourth exhaust groove 216 is provided on the side close to the arc-like surface, and in order to better exhaust the air in the mold, the fourth exhaust groove 216 is connected to the third exhaust groove 215, and the third exhaust groove 215 extends from the fourth exhaust groove 216 to the side away from the arc-like surface. In one embodiment, in order to achieve a better assembly effect between the sliders, the quadrangular pyramid splicing angle α of the third slider 203 is set to 83°.

[0083] In one embodiment, a step structure 218 is provided on the side of the third slider 203, and the pressing block 9 on the movable side mold core 4 abuts against the step structure 218. Specifically, the edge of the pressing block 9 is pressed against the step structure 218 to prevent the third slider 203 from shifting up and down during horizontal separation or convergence movement.

[0084] In one embodiment, an inclined hole 208 is provided on the third slider 203, and an inclined guide column 6 is connected to the inclined hole 208. One end of the inclined guide column 6 is connected to the top support 101 of the fixed side mold core 1, and the other end of the inclined guide column 6 is abutted against the inner wall of the inclined hole 208. When the fixed side mold core 1 moves upward, the inclined guide column 6 drives the third slider to move outward and apart, and when the fixed side mold core 1 moves downward, the inclined guide column 6 drives the third slider to move inward and converge.

[0085] like Figures 18 to 20 As shown, the top of the quadrangular pyramid of the fourth slider 204 (with Fig.18 The orientation shown is for reference) is indented to form a fourth type of arc surface 214. The specific structure of the fourth type of arc surface 214 depends on the structure of the desired plastic lens barrel.

[0086] A fourth exhaust groove 216 is provided on a side of the fourth slider 204 close to the movable side mold core 4. The fourth exhaust groove 216 is provided on a side close to the arc-like surface, and in order to better exhaust the air in the mold, the fourth exhaust groove 216 is connected to the third exhaust groove 215, and the third exhaust groove 215 extends from the fourth exhaust groove 216 to the side away from the arc-like surface. In one embodiment, in order to achieve a better assembly effect between the sliders, the splicing angle β of the quadrangular pyramid of the fourth slider 204 is set to 97°.

[0087] In one embodiment, a step structure 218 is provided on the side of the fourth slider 204, and the top of the protrusion of the movable side mold core 4 is connected to the pressing block 9 through the fourth mounting hole 408 and abuts against the step structure 218. Specifically, the edge of the pressing block 9 is pressed against the step structure 218 to prevent the fourth slider 204 from shifting up and down during horizontal separation or convergence movement.

[0088] Among the four sliders, the step structures on the two sides of the same slider are pressed by different pressing blocks 9, that is, the same pressing block 9 presses on the step structures of two adjacent sliders. The slurry inlet hole 207 is formed by splicing the first type of arc surface 210, the second type of arc surface 211, the third type of arc surface 213 and the fourth type of arc surface 214 of the four sliders.

[0089] Considering the convenience of mold processing and the subsequent modification of the mold, a dividing hole 217 is provided on the fourth slider 204 , and a positioning dividing block is embedded in the dividing hole 217 for positioning the movable side insert 5 .

[0090] In one embodiment, an inclined hole 208 is provided on the fourth slider 204, and an inclined guide column 6 is connected to the inclined hole 208. One end of the inclined guide column 6 is connected to the top support 101 of the fixed side mold core 1, and the other end of the inclined guide column 6 is abutted against the inner wall of the inclined hole 208. When the fixed side mold core 1 moves upward, the inclined guide column 6 drives the fourth slider to move outward and apart, and when the fixed side mold core 1 moves downward, the inclined guide column 6 drives the fourth slider to move inward and converge.

[0091] In order to achieve a better exhaust effect without affecting product molding, the depth of the fourth exhaust groove 216 on the first slider 201, the second slider 202, the third slider 203 and the fourth slider 204 can be set to 0.01mm, and the depth of the third exhaust groove 215 can be set to 0.2mm.

[0092] The structures of the first slider 201, the second slider 202, the third slider 203 and the fourth slider 204 are basically the same, but there may be separate structures between the sliders due to the lens barrel structure or mold assembly requirements. This part of the structure is not the focus of improvement in this application and will not be described in detail.

[0093] It should be noted that this embodiment eliminates the gap caused by thermal expansion and improves positioning accuracy by changing the shape and assembly structure of the slider, but the number of sliders is not limited to 4. In other embodiments, the number of sliders may be 3, 4 or more than 4.

[0094] like Figures 21-22 As shown, in order to generate a compressive force on each slider, a locking ring 3 is provided on the outer wall of the slider group 2. The locking ring 3 is annular, and the inner wall of the locking ring 3 is simultaneously against the outer wall of the slider and the outer wall of the boss 401, so as to reduce the gap change between the sliders.

[0095] A first oil passage 301 is provided on the inner wall of the locking ring 3 , and lubricant is provided in the first oil passage 301 , so as to reduce the friction between the locking ring 3 and the slider and the boss 401 .

[0096] like Figures 23-26 As shown, a first flow channel 108 penetrating the first main body 102 and the top support 101 is provided on the fixed side mold core 1, and the first flow channel 108 is connected to an end of the molding hole 8 close to the fixed side mold core 1; a second flow channel 109 penetrating the first main body 102 and the top support 101 is provided on the fixed side mold core 1, and the second flow channel 109 is closer to the outer edge of the first main body 102 than the first flow channel 108.

[0097] The second flow channel 109 is connected to the guide hole 206 of the slider group 2, and is connected to the molding hole 8 through the gate 209 on the guide hole 206. The gate 209 provided on the guide hole 206 of the slider group 2 is located on the side of the guide hole 206 close to the movable side mold core 4.

[0098] The first flow channel 108 and the second flow channel 109 are used to inject plastic fluid into the molding hole 8, and the first flow channel 108 and the second flow channel 109 inject plastic fluid from both ends of the molding hole 8 to overcome the defect of uneven plastic fluid filling caused by the long length of the molding hole 8, ensuring that the overall filling is convenient and effective, and facilitating subsequent molding adjustments.

[0099] It should be noted that, in this embodiment, the guide hole 206 is arranged to penetrate the slider group 2, and the gate 209 on the guide hole 206 is not necessarily arranged at the end of the guide hole 206. If the gate 209 is not arranged at the end of the guide hole 206, part of the plastic fluid passing through the gate 209 will be retained in the guide hole 206 to form cold material, and the cold material will eventually be ejected together with the product through the ejector pin.

[0100] In one embodiment, a plurality of first exhaust grooves 103 are provided on the support 101, and each first exhaust groove 103 is respectively connected to the first flow channel 108 or the second flow channel 109. Specifically, the first exhaust groove 103 is connected to the first exhaust hole 110, and the first exhaust groove 103 is connected to the first flow channel 108 or the second flow channel 109 through the connecting groove 107, and the first exhaust hole 110 is set to penetrate the first body 102 and the support 101.

[0101] Since the second flow channel 109 is arranged near the outer edge of the first body 102 in this embodiment, the first exhaust hole 110 between the second flow channel 109 and the first exhaust groove 103 is omitted due to space limitations, and the first exhaust groove 103 is directly connected to the second flow channel 109 through the connecting groove 107 to achieve the effect of exhausting air in the mold. In other embodiments, the number and position of the first exhaust holes 110 can be determined according to the overall spatial position of the fixed side mold core 1.

[0102] In one embodiment, the depth of the first exhaust groove 103 is 0.2 mm, the depth of the connecting groove 107 is 0.02 mm, and the connecting groove 107 is located inside the top support 101. This is to facilitate exhausting the air in the mold, avoid excessive air pressure in the molding hole 8 to affect molding, and ensure the appearance quality and stability of the product.

[0103] In one embodiment, the first flow channel 108 and the second flow channel 109 gradually close at the outlet on the side close to the slider assembly 2 to form an inverted truncated cone with an included angle of 60° on the cross-section bevel and a height of 1.2 mm and 1.5 mm respectively.

[0104] In order to further enhance the exhaust effect, a second exhaust groove 111 is provided on the side of the first body 102 away from the top support 101, and the second exhaust groove 111 is arranged near the middle of the first body 102, and the second exhaust groove 111 is directly connected to the forming hole 8. The depth of the second exhaust groove 111 can be further set to 0.008 mm.

[0105] In this embodiment, the first body 102 and the support 101 are both cylindrical, which facilitates the structural connection between the components. The side of the first body 102 away from the support 101 is connected to the positioning groove formed by the sunken area of ​​the slider group 2.

[0106] An injection port 106 is provided at the top of the top support 101, and the injection port 106 is used to inject plastic fluid into the mold from the outside. The injection port 106 is connected to the first flow channel 108 or the second flow channel 109 (that is, each flow channel) to guide the injected plastic fluid into the molding hole 8 through the flow channel.

[0107] A first mounting hole 104 is provided on the outer edge of the top support 101 , and the inclined guide column 6 connected to each slider is correspondingly connected to the first mounting hole 104 on the top support 101 through the bushing 7 to realize the linkage of the fixed side mold core 1 and the slider group 2 .

[0108] A U-shaped hole 105 is also provided on the edge of the top support 101 , and the U-shaped hole 105 is used to limit the fixed side mold core 1 , thereby avoiding displacement during the plasticizing process and improving the stability of the mold.

[0109] In one embodiment, the process of making the optical lens barrel plastic mold of the present application is as follows:

[0110] At the moment of mold opening, the fixed side mold core 1 moves upward, driving the inclined guide column 6 to drive the sliders to move outward and apart, so that the discharge port of the first flow channel 108 and the gate 209 in the guide hole 206 are separated from the product (lens barrel) first; when the fixed side mold core 1 and the slider move a certain distance and stop, the product begins to be ejected (the movable side mold core 4 is equipped with an ejector pin, and the product is ejected by the ejector pin), and the movable side insert 5 is pulled out during the ejection, and the product is taken out after the ejection is completed.

[0111] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0112] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A plastic mold for an optical lens barrel, comprising a movable side mold core, a slider group and a fixed side mold core connected in sequence, characterized in that: The movable side mold core is provided with a truncated cone-shaped boss on a side close to the slider group, the boss is provided with a mounting groove, a center hole penetrating the movable side mold core is provided in the middle of the boss, a fifth exhaust groove is provided on the bottom surface of the mounting groove, the fifth exhaust groove is connected to a second exhaust hole, the second exhaust hole is arranged side by side with the center hole and penetrates the movable side mold core; The slider group is fitted and mounted in the assembly groove, and the slider group includes a plurality of sliders, each of which extends from the edge of the boss to the middle of the boss, and each of which is in the shape of a quadrangular pyramid on the side close to the middle of the boss, and the top of the quadrangular pyramid has an inwardly sunken arc-like surface, and the sides of all the sliders with the arc-like surface are abutted and connected to form a ring, and the middle of the ring is a slurry inlet hole corresponding to the center hole, and the periphery of the slider group is connected with a locking ring; The fixed side mold core includes a first main body and a top support arranged on one side of the first main body, and the other side of the first main body is correspondingly connected to the slurry inlet hole; The optical lens barrel plastic mold also includes a movable side insert, which penetrates into the center hole from the side of the movable side mold core away from the slider group, and extends to the slurry entry hole and then abuts against the fixed side mold core, the movable side insert is in contact with the inner wall of the center hole, and a gap is provided between the movable side insert and the inner wall of the slurry entry hole, and the gap serves as a molding hole for the barrel plastic, the movable side insert is provided with a longitudinal exhaust hole and a transverse exhaust hole that penetrate through, and a second exhaust groove is provided on the side of the first main body away from the top support, the second exhaust groove is arranged near the middle of the first main body, the second exhaust groove is directly connected to the molding hole, and the outer wall of the part where the movable side insert is in contact with the inner wall of the center hole is provided with a second oil channel, and a lubricant is provided in the second oil channel.

2. The optical lens barrel plastic mold according to claim 1, characterized in that: The fixed side mold core is provided with a first flow channel penetrating the first main body and the top support, and the first flow channel is connected to an end of the molding hole close to the fixed side mold core.

3. The optical lens barrel plastic mold according to claim 2, characterized in that: The fixed side mold core is provided with a second flow channel penetrating through the first main body and the top support, and the second flow channel is closer to the outer edge of the first main body than the first flow channel; A guide hole corresponding to the second flow channel is provided at the abutting position of two adjacent sliders, and the guide hole is provided with a gate connected to the molding hole, and the gate is located at one end of the molding hole close to the movable side mold core.

4. The optical lens barrel plastic mold according to claim 3, characterized in that: The top support is provided with a plurality of first exhaust grooves, and each first exhaust groove is correspondingly connected to the first flow channel or the second flow channel.

5. The optical lens barrel plastic mold according to claim 1, characterized in that: The assembly groove is cross-shaped, the intersection of the cross corresponds to the center hole, and the outer wall of the cross extends from the intersection to the outer edge of the boss; the sliders are four, and each slider is embedded in correspondence with the outer wall of the cross.

6. The optical lens barrel plastic mold according to claim 1, characterized in that: A pressing block is connected to the boss, and a step structure is provided on the side of each sliding block, and the pressing block abuts against the step structure.

7. The optical lens barrel plastic mold according to claim 1, characterized in that: The number of the sliding blocks is 3, 4 or more than 4.

8. The optical lens barrel plastic mold according to claim 1, characterized in that: The locking ring is annular, the inner wall of the locking ring abuts against the outer wall of the slider and the outer wall of the boss, and a first oil channel is arranged on the inner wall of the locking ring, and lubricant is arranged in the first oil channel.

9. The optical lens barrel plastic mold according to claim 1, characterized in that: Each of the sliders is provided with an inclined hole, and an inclined guide column is connected to the inclined hole. One end of the inclined guide column is connected to the top support of the fixed side mold core, and the other end of the inclined guide column is abutted against the inner wall of the inclined hole. When the fixed side mold core moves upward, the inclined guide column drives each slider to move outward and apart.

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