An optical lens injection mold assembly and its injection molding method

Abstract

The present invention relates to the technical field of lens manufacturing, and particularly relates to an optical lens injection mold assembly and an injection molding method thereof. An optical lens injection mold assembly includes a core structure, an upper mold structure, and a lower mold structure. The core structure includes an upper core, an inner lower core, and an outer lower core. The upper mold structure includes an upper template, an upper mold base plate, a first demolding structure, and a sprue bushing. The lower mold structure includes a lower template, a support plate, a lower mold base plate, a second demolding structure, and a third demolding structure. By changing the demolding method of the optical lens from the ejection of the inner lower core that controls the surface shape to the core pulling of the outer lower core that controls the outer diameter, the outer lower core that controls the outer diameter of the lens moves along with the support plate, and the upper core and the inner lower core do not move relative to the upper template and the lower template respectively, avoiding manufacturing errors caused by the movement of the core that controls the surface shape. Only by the relative movement of the outer lower core that controls the outer diameter relative to the lower template can demolding be achieved, thereby improving the optical quality of the lens.

Description

Technical Field

[0001] The present invention relates to the technical field of lens manufacturing, and in particular to an optical lens injection mold assembly and an injection molding method thereof. Background Art

[0002] The function of an optical lens is to produce optical images. An essential component in an optical imaging system, the optical lens directly impacts image quality and the implementation and effectiveness of algorithms. Structurally, an optical lens generally consists of a lens barrel, lenses, spacers, shading paper, and other optical components. The lens is one of the most important components of an optical lens. Based on the principles of optical lens characteristics, optical lenses can be divided into three categories: plastic lenses, glass lenses, and glass-plastic hybrid lenses. To reduce lens costs, many lenses are plastic. Due to the extremely high requirements for optical lenses, the processing and manufacturing precision of injection molds must reach a higher level.

[0003] Existing lens injection molds usually achieve demolding by directly moving the mold core. After a long period of movement, the mold core will shift, causing errors in the eccentricity accuracy of the subsequent injection-molded lenses, affecting the optical quality of the lenses. Summary of the Invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide an optical lens injection mold assembly and an injection molding method thereof.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an optical lens injection mold assembly, comprising a mold core structure, an upper mold structure, and a lower mold structure.

[0006] The mold core structure includes an upper mold core, an inner lower mold core, and an outer lower mold core. The upper mold core, the inner lower mold core, and the outer lower mold core respectively shape the upper surface, the lower surface, and the side surface of the lens.

[0007] The upper mold structure includes an upper mold plate, an upper mold base plate, a first demolding structure, and a sprue sleeve. The upper mold plate is fixedly connected to the upper mold base plate. The upper mold core and the sprue sleeve are fixedly arranged in the upper mold plate. An ejection part connected to the lens is formed between the sprue sleeve and the mold core structure. The first demolding structure is used to press against the lens and the ejection part during demolding, so that the upper mold core is separated from the upper surface of the lens and the sprue sleeve is separated from the ejection part.

[0008] The lower mold structure includes a lower mold plate, a support plate, a lower mold base plate, a second demolding structure, and a third demolding structure. The lower mold plate is arranged on the support plate, and the support plate is fixed on the lower mold base plate. The inner lower mold core is fixed on the lower mold plate, and the outer lower mold core is arranged on the support plate. The second demolding structure is connected to the lower mold plate and is used to drive the lower mold plate to move upward and separate from the support plate. The third demolding structure abuts against the ejection part and is used to drive the ejection part to move upward.

[0009] Further, the first demolding structure includes an upper die insert. A first elastic member is disposed between the top of the upper die insert and the upper template and connects them through the first elastic member, and the bottom of the upper die insert abuts against the ejecting part.

[0010] Further, the first demolding structure includes a first limiting member. One end of the first limiting member is connected to the upper template, and the other end is clamped with the upper die insert to limit the moving distance of the upper die insert.

[0011] Further, the lower template includes a first lower template and a second lower template. The first lower template is fixed on the second lower template and abuts against the upper template, and the bottom of the inner lower die core is fixed between the first lower template and the second lower template.

[0012] Further, a first ejector rod is disposed on the upper template. A second elastic member is disposed between the top of the first ejector rod and the upper die base plate and connects them through the second elastic member, and the bottom of the first ejector rod abuts against the lower template.

[0013] Further, the second demolding structure includes a second ejector rod. A third elastic member is disposed between the bottom of the second ejector rod and the support plate and connects them through the third elastic member, and the top of the second ejector rod abuts against the upper template. The bottom of the second ejector rod is clamped with the lower template.

[0014] Further, the second demolding structure includes a first pull rod and a pull block. The top of the first pull rod is disposed on the upper template, and the bottom is engaged with the pull block. The pull block is disposed on the lower template. When the upper template rises to a certain height, the first pull rod contacts the pull block and drives the pull block to move upward.

[0015] Further, the second demolding structure includes a second pull rod. A clamping hole for the second pull rod to move is disposed on the lower template. The top of the second pull rod is disposed on the upper template, and the bottom is engaged with the clamping hole. When the upper template rises to a certain height, the second pull rod is clamped with the lower template and drives the lower template to move upward.

[0016] Further, the second demolding structure includes a second limiting member. One end of the second limiting member is connected to the support plate, and the other end is clamped with the lower template to limit the moving distance of the lower template.

[0017] Further, the third demolding structure includes a pushing rod, an ejector pin plate, and two demolding ejector pins. The bottoms of the two demolding ejector pins are both fixed on the ejector pin plate, and the tops respectively abut against different parts of the ejecting part. The pushing rod is used to push the ejector pin plate upward, so that the ejecting part and the lens move upward and separate from the inner lower die core.

[0018] Further, the third demolding structure includes a reset ejector pin and a reset spring. The reset ejector pin is fixed on the ejector plate, and the reset spring is sleeved around the reset ejector pin. The upper end of the reset spring is connected to the support plate, and the lower end is connected to the ejector plate.

[0019] Further, the ejector plate includes an upper top plate and a lower top plate which are fixedly connected. The bottoms of the demolding ejector pin and the reset ejector pin are fixed between the upper top plate and the lower top plate.

[0020] Further, the bottom of the outer lower mold core is fixed on the support plate by bolts.

[0021] Further, a bottom plate is connected to the bottom of the outer lower mold core. A fourth elastic member is provided between the top of the bottom plate and the lower template, and the bottom of the bottom plate abuts against the support plate.

[0022] The present invention also provides an injection molding method for an optical lens injection mold assembly, including the following steps:

[0023] Step 1, injecting through the sprue bushing into the mold core structure, so that the lens is formed in the mold core structure, and the ejecting part is formed between the sprue bushing and the mold core structure; [[ID=,16]]

[0024] Step 2, the upper template moves upward to separate from the lower template to start demolding. The upper mold insert moves downward relative to the upper template under the action of the first elastic member to continuously abut against the lens and the ejecting part. The upper mold core and the sprue bushing move upward following the upper template. The upper mold core separates from the upper surface of the lens, and the sprue bushing separates from the ejecting part;

[0025] Step 3, the upper template continues to move upward. The first ejector rod moves downward relative to the upper template under the action of the second elastic member to continuously abut against the lower template, so that the lower template remains stationary. The upper mold insert stops its relative movement with the upper template under the action of the first limiting member. The upper mold insert moves upward following the upper template, and the upper mold insert separates from the lens and the ejecting part;

[0026] Step 4, the upper template continues to move upward. The first ejector rod reaches the maximum movement distance. The first ejector rod moves upward following the upper template. The first ejector rod separates from the lower template. The second ejector rod moves upward under the action of the third elastic member and drives the lower template to move upward. The lower template separates from the support plate. The lower template drives the inner lower mold core and the lens to move upward, and the side surface of the lens separates from the outer lower mold core;

[0027] Step 5, the lower template stops moving under the action of the second limiting member. The push rod pushes the ejector plate and the two demolding ejector pins to move upward. The demolding ejector pins drive the ejecting part and the lens to move upward. The lower surface of the lens separates from the inner lower mold core, and demolding is completed to remove the lens.

[0028] As can be seen from the above description of the present invention, compared with the prior art, the optical lens injection mold assembly of the present invention has at least one of the following beneficial effects:

[0029] 1. The optical lens injection mold assembly of the present invention changes the demolding method of the optical lens from the inner lower mold core that controls the surface shape to the outer lower mold core that controls the outer diameter. During the entire demolding process, under the action of the first demolding structure, the second demolding structure, and the third demolding structure, the upper mold core that controls the lens surface shape follows the upper template to move, the inner lower mold core that controls the lens surface shape follows the lower template to move, and the outer lower mold core that controls the lens outer diameter follows the support plate to move. The upper mold core and the inner lower mold core do not move relative to the upper template and the lower template respectively, avoiding manufacturing errors caused by the movement of the mold core that controls the surface shape. Only the outer lower mold core that controls the outer diameter moves relative to the lower template to achieve demolding, further improving the eccentricity accuracy of the upper and lower optical surfaces of the lens, thereby improving the optical quality of the lens.

[0030] 2. When the thickness of the lens outer diameter is large, resulting in the demolding force of the outer diameter being greater than the demolding force of the surface shape, due to the large demolding force of the outer diameter, it is easy to cause damage to the lens structure; by using the demolding method of the present application, first removing the outer diameter area with a large demolding force and then removing the surface shape area with a small demolding force can make the force on each part of the lens during the demolding process more balanced and can greatly reduce the demolding damage of the lens during the demolding process.

[0031] 3. The optical lens injection mold assembly of the present invention can significantly improve the accuracy of the lens with the positioning structure set inside. Since the positioning structure of the lens is set inside and does not use external edge positioning, the requirements for the outer diameter size are relatively low. By setting the ejection mechanism only in the part that affects the outer diameter, the positioning accuracy of the positioning structure can be greatly improved, effectively improving the assembly stability of the lens and improving the optical performance of the lens.

[0032] 4. The optical lens injection mold assembly of the present invention controls the moving distance of the core-pulling mold core, making it move at a very small distance, and the positioning accuracy control of the outer lower mold core that controls the outer diameter does not need to be very high, and its sliding gap can be set larger. The moving distance and sliding gap of the core-pulling mold core solve the problem of mold core jamming.

[0033] 5. The optical lens injection mold assembly of the present invention has multi-stage demolding. Since the lens surface contains steps or the surface shape is relatively tortuous, using multi-stage demolding, the overall adhesion force of the mold to the lens is dispersed, thereby avoiding the phenomenon of poor demolding on the lens surface, reducing the force of the mold on the lens, and making the lens not easily deformed.

[0034] 6. The optical lens injection mold assembly of the present invention has a good exhaust effect. The multi-stage demolding method increases the number of inserts in the cavity, and the gaps between the inserts are beneficial to the exhaust effect during the molding process, effectively improving the problems such as trapped air during the lens molding.

[0035] 7. In the injection molding method of the present invention, during the entire demolding process, the upper mold core for controlling the lens surface shape and the inner lower mold core do not move relative to the upper template and the lower template respectively, avoiding manufacturing errors caused by the movement of the mold cores for controlling the surface shape. Only the outer lower mold core for controlling the outer diameter moves relative to the lower template to achieve demolding, improving the optical quality of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is one of the structural schematic diagrams of an optical lens injection molding die assembly in the first specific embodiment of the present invention;

[0037] Figure 2 It is Figure 1 the enlarged view of part A of

[0038] Figure 3 It is the second structural schematic diagram of an optical lens injection molding die assembly in the first specific embodiment of the present invention;

[0039] Figure 4 It is the third structural schematic diagram of an optical lens injection molding die assembly in the first specific embodiment of the present invention;

[0040] Figure 5 It is the fourth structural schematic diagram of an optical lens injection molding die assembly in the first specific embodiment of the present invention;

[0041] Figure 6 It is the fifth structural schematic diagram of an optical lens injection molding die assembly in the first specific embodiment of the present invention;

[0042] Figure 7 It is the sixth structural schematic diagram of an optical lens injection molding die assembly in the first specific embodiment of the present invention;

[0043] Figure 8 It is the structural schematic diagram of the lens in the first specific embodiment of the present invention;

[0044] Figure 9 It is the structural schematic diagram of an optical lens injection molding die assembly in the second specific embodiment of the present invention;

[0045] Figure 10 It is the structural schematic diagram of an optical lens injection molding die assembly in the third specific embodiment of the present invention;

[0046] Figure 11 It is the structural schematic diagram of an optical lens injection molding die assembly in the fourth specific embodiment of the present invention;

[0047] Reference numerals: 1, core structure; 2, upper mold structure; 3, lower mold structure; 4, lens; 5, ejecting part; 11, upper core; 12, inner lower core; 13, outer lower core; 21, upper template; 22, upper mold base plate; 23, first demolding structure; 24, sprue bushing; 31, lower template; 32, support plate; 33, lower mold base plate; 34, second demolding structure; 35, third demolding structure; 131, bottom plate; 132, fourth elastic member; 211, first ejector rod; 212, second elastic member; 231, upper mold insert; 232, first elastic member; 233, first limiting member; 311, first lower template; 312, second lower template; 341, second ejector rod; 342, third elastic member; 343, first pull rod; 344, pull block; 345, second pull rod; 346, second limiting member; 351, pusher rod; 352, ejector plate; 353, demolding ejector pin; 354, reset ejector pin; 355, reset spring. Detailed implementation manners

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0049] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present invention.

[0050] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Specific embodiment 1:

[0052] Referring to Figure 1-8 As shown, in a preferred embodiment of the present invention, an optical lens injection mold assembly includes a core structure 1, an upper mold structure 2, and a lower mold structure 3.

[0053] The mold core structure 1 includes an upper mold core 11, an inner lower mold core 12, and an outer lower mold core 13. The upper mold core 11, the inner lower mold core 12, and the outer lower mold core 13 respectively form the upper surface, the lower surface, and the side surface of the lens 4.

[0054] The upper mold structure 2 includes an upper template 21, an upper mold base plate 22, a first demolding structure 23, and a sprue bushing 24. The upper template 21 is fixedly connected to the upper mold base plate 22. The upper mold core 11 and the sprue bushing 24 are fixedly arranged in the upper template 21. A ejector part 5 connected to the lens 4 is formed between the sprue bushing 24 and the mold core structure 1. The first demolding structure 23 is used to abut against the lens 4 and the ejector part 5 during demolding, so that the upper mold core 11 is separated from the upper surface of the lens 4, and the sprue bushing 24 is separated from the ejector part 5.

[0055] The lower mold structure 3 includes a lower template 31, a support plate 32, a lower mold base plate 33, a second demolding structure 34, and a third demolding structure 35. The lower template 31 is arranged on the support plate 32. The support plate 32 is fixed on the lower mold base plate 33. The inner lower mold core 12 is fixed on the lower template 31. The outer lower mold core 13 is arranged on the support plate 32. The second demolding structure 34 is connected to the lower template 31 and is used to drive the lower template 31 to move upward and separate from the support plate 32. The third demolding structure 35 abuts against the ejector part 5 and is used to drive the ejector part 5 to move upward.

[0056] In the optical lens injection mold assembly of the present invention, the demolding method of the optical lens 4 is changed from the ejection of the inner lower mold core 12 that controls the surface shape to the core pulling of the outer lower mold core 13 that controls the outer diameter. During the entire demolding process, under the action of the first demolding structure 23, the second demolding structure 34, and the third demolding structure 35, the upper mold core 11 that controls the surface shape of the lens 4 moves with the upper template 21, the inner lower mold core 12 that controls the surface shape of the lens 4 moves with the lower template 31, and the outer lower mold core 13 that controls the outer diameter of the lens 4 moves with the support plate 32. The upper mold core 11 and the inner lower mold core 12 do not move relative to the upper template 21 and the lower template 31 respectively, avoiding manufacturing errors caused by the movement of the mold core that controls the surface shape. Only the outer lower mold core 13 that controls the outer diameter moves relative to the lower template 31 to achieve demolding, further improving the eccentricity accuracy of the upper and lower optical surfaces of the lens 4, thereby improving the optical quality of the lens 4.

[0057] When the thickness of the outer diameter of the lens 4 is large, resulting in the demolding force of the outer diameter being greater than the demolding force of the surface shape, due to the large demolding force of the outer diameter, it is easy to cause damage to the structure of the lens 4; by adopting the demolding method of the present application, first removing the outer diameter area with a large demolding force and then removing the surface shape area with a small demolding force can make the force on each part of the lens 4 more balanced during the demolding process, and can greatly reduce the demolding damage of the lens 4 during the demolding process.

[0058] The optical lens injection mold assembly of the present invention particularly improves the accuracy of the lens 4 with the positioning structure arranged inside. Since the positioning structure of the lens 4 is arranged inside and does not use the outer edge for positioning, the requirements for the outer diameter size are relatively low. By arranging the ejection mechanism in the part that only affects the outer diameter, the positioning accuracy of the positioning structure can be greatly improved, effectively improving the assembly stability of the lens 4 and improving the optical performance of the lens. Refer to Figure 8 As shown, the demolding forces of the side, upper positioning surface, and lower positioning surface of the lens 4 from the mold core are different. The side of the lens 4 does not play a positioning role during lens assembly, so the dimensional accuracy requirements for the side are relatively low. The mold structure of the present application is more suitable for the lens 4 with such a structure.

[0059] The optical lens injection mold assembly of the present invention controls the moving distance of the core-pulling mold core, enabling it to move within a very small distance, and the positioning accuracy control of the outer lower mold core 13 for the outer diameter does not need to be very high, and its sliding clearance can be set larger. The moving distance and sliding clearance of the core-pulling mold core solve the problem of mold core jamming.

[0060] The optical lens injection mold assembly of the present invention has multi-stage demolding. Since the surface of the lens 4 contains steps or the surface shape is relatively tortuous, with multi-stage demolding, the overall adhesion force of the mold to the lens 4 is dispersed, thereby avoiding the phenomenon of poor demolding on the surface of the lens 4, reducing the force of the mold on the lens 4, and making the lens 4 not easily deformed.

[0061] The optical lens injection mold assembly of the present invention has a good exhaust function. The multi-stage demolding method increases the number of inserts in the cavity, and the gaps between the inserts are beneficial to the exhaust function during the molding process, effectively improving the problem of air entrapment during the molding of the lens 4.

[0062] As a preferred embodiment of the present invention, it may further have the following additional technical features:

[0063] In this embodiment, the first demolding structure 23 includes an upper mold insert 231. A first elastic member 232 is arranged between the top of the upper mold insert 231 and the upper template 21 and is connected through the first elastic member 232. The bottom is in contact with the ejection part 5. The first demolding structure 23 includes a first limiting member 233. One end of the first limiting member 233 is connected to the upper template 21, and the other end is clamped with the upper mold insert 231 to limit the moving distance of the upper mold insert 231.

[0064] Refer to Figure 3As shown, when the mold starts to demold, in the first-stage position, the upper template 21 and the lower template 31 begin to separate. The upper die insert 231 is ejected by the first elastic member 232 by a distance d1. Under the action of the first limiting member 233, the upper die insert 231 stops after moving a distance d1. During the ejection process of the upper die insert 231, the ejected part 5 and the lens 4 are separated from the sprue bushing 24 and the upper die core 11, completing the first demolding action.

[0065] In this embodiment, the lower template 31 includes a first lower template 311 and a second lower template 312. The first lower template 311 is fixed on the second lower template 312 and abuts against the upper template 21. The bottom of the inner lower die core 12 is fixed between the first lower template 311 and the second lower template 312. The lower template 31 includes the first lower template 311 and the second lower template 312 which are fixedly connected. Through the first lower template 311 and the second lower template 312, the inner lower die core 12 can be better fixed, ensuring that the inner lower die core 12 does not move relative to the lower template 31, and further improving the eccentricity accuracy of the lower optical surface of the lens 4.

[0066] In this embodiment, a first ejector rod 211 is provided on the upper template 21. A second elastic member 212 is provided between the top of the first ejector rod 211 and the upper die base plate 22 and they are connected by the second elastic member 212. The bottom of the first ejector rod 211 abuts against the lower template 31. The second demolding structure 34 includes a second ejector rod 341. A third elastic member 342 is provided between the bottom of the second ejector rod 341 and the support plate 32 and they are connected by the third elastic member 342. The top of the second ejector rod 341 abuts against the upper template 21. The bottom of the second ejector rod 341 is clamped with the lower template 31. The second demolding structure 34 includes a second limiting member 346. One end of the second limiting member 346 is connected to the support plate 32 and the other end is clamped with the lower template 31, for limiting the moving distance of the lower template 31.

[0067] In Figure 3 when the first demolding action is completed, at this time, the second ejector rod 341 also moves upward by a distance d1 under the action of the third elastic member 342 and applies a certain pressure f2' to the upper template 21. At the same time, the first ejector rod 211 applies a certain pressure f1' to the lower template 31. Under the action of the pressure f1', the second ejector rod 341 has not yet generated an upward elastic force on the lower template 31, and the lower template 31 and the support plate 32 remain in place;

[0068] Figure 4 Shows Figure 3When the mold shown further separates to the second-stage position and the second ejector rod 341 moves to a distance d3, the second ejector rod 341 exerts no pressure on the upper template 21 at this time. The elastic force of the third elastic member 342 on the second ejector rod 341 is f3 at this time. The first ejector rod 211 continues to exert a pressure f4 on the lower template 31, and f4 > f3, so that the lower template 31 and the support plate 32 will not be ejected by the third elastic member 342.

[0069] Figure 5 shows Figure 4 After the mold shown continues to separate, under the action of the third elastic member 342, when the second ejector rod 341 reaches the maximum distance d2, the first ejector rod 211 stops under the action of the upper template 21. At this time, since the lower template 31 is still under the pressure of the first ejector rod 211 when moving upward, it continues to remain stationary.

[0070] Figure 6 shows Figure 5 After the mold shown continues to separate, the first ejector rod 211 separates from the lower template 31. Under the action of the third elastic member 342, the lower template 31 and the support plate 32 are ejected a distance d4 and then fixed by the second limiting member 346. Since the outer lower die core 13 is fixed on the support plate 32, relative movement occurs between the lower template 31 and the outer lower die core 13. The ejector part 5, the lens 4, and the lower template 31 move upward simultaneously, and the side surface of the lens 4 disengages from the outer lower die core 13.

[0071] In this embodiment, the third demolding structure 35 includes a push rod 351, a thimble plate 352, and two demolding thimbles 353. The bottoms of the two demolding thimbles 353 are both fixed on the thimble plate 352, and the tops are respectively in contact with different parts of the ejector part 5. The push rod 351 is used to push the thimble plate 352 to move upward, so that the ejector part 5 and the lens 4 move upward to disengage from the inner lower die core 12.

[0072] Figure 7 shows Figure 6 After the upper template 21 and the lower template 31 of the mold shown are completely separated, the two demolding thimbles 353 eject the ejector part 5 under the thrust of the thimble plate 352, so that the lower surface of the lens 4 disengages from the inner lower die core 12, completing the final demolding.

[0073] In this embodiment, the third demolding structure 35 includes a reset thimble 354 and a reset spring 355. The reset thimble 354 is fixed on the thimble plate 352, and the reset spring 355 is sleeved around the reset thimble 354. The upper end of the reset spring 355 is connected to the support plate 32, and the lower end is connected to the thimble plate 352. The third demolding structure 35 includes a reset thimble 354 and a reset spring 355. Through the action of the reset thimble 354 and the reset spring 355, when the push rod 351 retracts, the reset spring 355 drives the thimble plate 352 to move downward for resetting.

[0074] In this embodiment, the ejector plate 352 includes an upper top plate and a lower top plate fixedly connected, and the bottoms of the demolding ejector pins 353 and the reset ejector pins 354 are fixed between the upper top plate and the lower top plate. The ejector plate 352 includes an upper top plate and a lower top plate fixedly connected, and the demolding ejector pins 353 and the reset ejector pins 354 can be better fixed through the upper top plate and the lower top plate.

[0075] In this embodiment, the bottom of the outer lower die core 13 is fixed on the support plate 32 by bolts. The bottom of the outer lower die core 13 is fixed on the support plate 32 by bolts, so that the outer lower die core 13 moves synchronously with the support plate 32. Specific Embodiment Two:

[0077] Refer to Figure 9 As shown, the difference between this embodiment and the first embodiment is that the second demolding structure 34 does not adopt the second ejector rod 341 and the third elastic member 342.

[0078] The second demolding structure 34 includes a first pull rod 343 and a pull block 344. The top of the first pull rod 343 is arranged on the upper template 21, and the bottom is matched with the pull block 344. The pull block 344 is arranged on the lower template 31. When the upper template 21 rises to a certain height, the first pull rod 343 contacts the pull block 344 and drives the pull block 344 to move upward.

[0079] The second demolding structure 34 drives the lower template 31 to move through the first pull rod 343 and the pull block 344, so that the lower template 31 is separated from the support plate 32, and the overall structure is simpler. Specific Embodiment Three:

[0081] Refer to Figure 10 As shown, the difference between this embodiment and the first embodiment is that the second demolding structure 34 does not adopt the second ejector rod 341 and the third elastic member 342.

[0082] The second demolding structure 34 includes a second pull rod 345. A clamping hole for the second pull rod 345 to move is arranged on the lower template 31. The top of the second pull rod 345 is arranged on the upper template 21, and the bottom is matched with the clamping hole. When the upper template 21 rises to a certain height, the second pull rod 345 is clamped with the lower template 31 and drives the lower template 31 to move upward.

[0083] The second demolding structure 34 drives the lower template 31 to move through the second pull rod 345 and the clamping hole, so that the lower template 31 is separated from the support plate 32, and the overall structure is simpler. Specific Embodiment Four:

[0085] Refer to Figure 11As shown in the figure, the difference between this embodiment and the first embodiment is that the bottom of the outer lower die insert 13 is not fixed to the support plate 32 by bolts.

[0086] A bottom plate 131 is connected to the bottom of the outer lower die insert 13. A fourth elastic member 132 is provided between the top of the bottom plate 131 and the lower template 31, and the bottom abuts against the support plate 32.

[0087] The outer lower die insert 13 is not completely bolt-fixed to the support plate 32. Instead, pressure is provided to the bottom plate 131 through the fourth elastic member 132 to achieve a flexible connection between the outer lower die insert 13 and the support plate 32. The flexible connection can well solve the possible jamming problem of the outer lower die insert 13.

[0088] The present invention also provides an injection molding method for an optical lens injection molding die assembly, including the following steps:

[0089] Step 1, injection molding is carried out into the die structure 1 through the sprue bushing 24, so that the lens 4 is formed in the die structure 1, and the ejector part 5 is formed between the sprue bushing 24 and the die structure 1.

[0090] Step 2, the upper template 21 moves upward to separate from the lower template 31 to start demolding. The upper die insert 231 moves downward relative to the upper template 21 under the action of the first elastic member 232 to continuously abut against the lens 4 and the ejector part 5. The upper die insert 11 and the sprue bushing 24 move upward following the upper template 21. The upper die insert 11 is separated from the upper surface of the lens 4, and the sprue bushing 24 is separated from the ejector part 5.

[0091] Step 3, the upper template 21 continues to move upward. The first ejector rod 211 moves downward relative to the upper template 21 under the action of the second elastic member 212 to continuously abut against the lower template 31, so that the lower template 31 remains stationary. The upper die insert 231 stops its relative movement with the upper template 21 under the action of the first limiting member 233. The upper die insert 231 moves upward following the upper template 21, and the upper die insert 231 is separated from the lens 4 and the ejector part 5.

[0092] Step 4, the upper template 21 continues to move upward. The first ejector rod 211 reaches the maximum movement distance. The first ejector rod 211 moves upward following the upper template 21, and the first ejector rod 211 is separated from the lower template 31. The second ejector rod 341 moves upward under the action of the third elastic member 342 and drives the lower template 31 to move upward. The lower template 31 is separated from the support plate 32. The lower template 31 drives the inner lower die insert 12 and the lens 4 to move upward, and the side surface of the lens 4 is separated from the outer lower die insert 13.

[0093] Step 5: The lower template 31 stops moving under the action of the second limiting member 346. The ejector rod 351 pushes the ejector plate 352 and the two demolding ejector pins 353 to move upward. The demolding ejector pins 353 drive the ejecting part 5 and the lens 4 to move upward. The lower surface of the lens 4 is separated from the inner lower die core 12, and demolding is completed to remove the lens 4.

[0094] In the injection molding method of the present invention, during the entire demolding process, the upper die core 11 and the inner lower die core 12 for controlling the surface shape of the lens 4 do not move relative to the upper template 21 and the lower template 31 respectively, avoiding manufacturing errors caused by the movement of the die cores for controlling the surface shape. Only the outer lower die core 13 for controlling the outer diameter moves relative to the lower template 31 to achieve demolding, improving the optical quality of the lens 4.

[0095] On the premise of no conflict, those skilled in the art can freely combine and superimpose the above additional technical features.

[0096] It can be understood that the present invention is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent substitutions can be made to these features and embodiments. Additionally, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. An optical lens injection mold assembly, characterized in that, It includes a core structure (1), an upper mold structure (2), and a lower mold structure (3). The core structure (1) includes an upper core (11), an inner lower core (12), and an outer lower core (13). The upper core (11), the inner lower core (12), and the outer lower core (13) respectively form the upper surface, the lower surface, and the side surface of the lens (4). The upper mold structure (2) includes an upper template (21), an upper mold base plate (22), a first demolding structure (23), and a sprue bushing (24). The upper template (21) is fixedly connected to the upper mold base plate (22). The upper core (11) and the sprue bushing (24) are fixedly arranged in the upper template (21). A ejector part (5) connected to the lens (4) is formed between the sprue bushing (24) and the core structure (1). The first demolding structure (23) includes an upper mold insert (231). A first elastic member (232) is arranged between the top of the upper mold insert (231) and the upper template (21) and connected through the first elastic member (232). The bottom of the upper mold insert (231) abuts against the ejector part (5). The first demolding structure (23) includes a first limiting member (233). One end of the first limiting member (233) is connected to the upper template (21), and the other end is snap-connected to the upper mold insert (231) for limiting the moving distance of the upper mold insert (231). The first demolding structure (23) is used to abut against the lens (4) and the ejector part (5) during demolding, so that the upper core (11) is separated from the upper surface of the lens (4), and the sprue bushing (24) is separated from the ejector part (5). The lower mold structure (3) includes a lower template (31), a support plate (32), a lower mold base plate (33), a second demolding structure (34), and a third demolding structure (35). The lower template (31) is arranged on the support plate (32). The support plate (32) is fixed on the lower mold base plate (33). The inner lower core (12) is fixed on the lower template (31). The outer lower core (13) is arranged on the support plate (32). The second demolding structure (34) is connected to the lower template (31) and is used to drive the lower template (31) to move upward and separate from the support plate (32). The third demolding structure (35) abuts against the ejector part (5) and is used to drive the ejector part (5) to move upward.

2. An optical lens injection mold assembly according to claim 1, characterized in that, The lower template (31) includes a first lower template (311) and a second lower template (312). The first lower template (311) is fixed on the second lower template (312) and abuts against the upper template (21). The bottom of the inner lower core (12) is fixed between the first lower template (311) and the second lower template (312).

3. An optical lens injection mold assembly according to claim 1, wherein A first ejector rod (211) is arranged on the upper template (21). A second elastic member (212) is arranged between the top of the first ejector rod (211) and the upper mold base plate (22) and connected through the second elastic member (212). The bottom of the first ejector rod (211) abuts against the lower template (31).

4. An optical lens injection mold assembly according to claim 1, characterized in that, The second demolding structure (34) includes a second ejector rod (341). A third elastic member (342) is provided between the bottom of the second ejector rod (341) and the support plate (32) and they are connected by the third elastic member (342). The top of the second ejector rod (341) abuts against the upper template (21), and the bottom of the second ejector rod (341) is clamped to the lower template (31).

5. An optical lens injection mold assembly according to claim 1, characterized in that, The second demolding structure (34) includes a first pull rod (343) and a pull block (344). The top of the first pull rod (343) is arranged on the upper template (21), and the bottom is matched with the pull block (344). The pull block (344) is arranged on the lower template (31). When the upper template (21) rises to a certain height, the first pull rod (343) contacts the pull block (344) and drives the pull block (344) to move upward.

6. An optical lens injection mold assembly according to claim 1, wherein, The second demolding structure (34) includes a second pull rod (345). A clamping hole for the second pull rod (345) to move is arranged on the lower template (31). The top of the second pull rod (345) is arranged on the upper template (21), and the bottom is matched with the clamping hole. When the upper template (21) rises to a certain height, the second pull rod (345) is clamped to the lower template (31) and drives the lower template (31) to move upward.

7. An optical lens injection mold assembly according to claim 1, characterized in that, The second demolding structure (34) includes a second limiting member (346). One end of the second limiting member (346) is connected to the support plate (32), and the other end is clamped to the lower template (31) for limiting the moving distance of the lower template (31).

8. An optical lens injection mold assembly according to claim 1, characterized in that, The third demolding structure (35) includes a pushing rod (351), an ejector plate (352), and two demolding ejector pins (353). The bottoms of the two demolding ejector pins (353) are both fixed on the ejector plate (352), and the tops respectively abut against different parts of the ejecting part (5). The pushing rod (351) is used to push the ejector plate (352) to move upward, so that the ejecting part (5) and the lens (4) move upward to be separated from the inner lower mold core (12).

9. An optical lens injection mold assembly according to claim 8, characterized in that, The third demolding structure (35) includes a reset ejector pin (354) and a reset spring (355). The reset ejector pin (354) is fixed on the ejector plate (352). The reset spring (355) is sleeved around the reset ejector pin (354). The upper end of the reset spring (355) is connected to the support plate (32), and the lower end is connected to the ejector plate (352).

10. An optical lens injection mold assembly according to claim 9, characterized in that, The ejector plate (352) includes an upper top plate and a lower top plate which are fixedly connected. The bottoms of the demolding ejector pins (353) and the reset ejector pin (354) are fixed between the upper top plate and the lower top plate.

11. An optical lens injection mold assembly according to claim 1, characterized in that, The bottom of the outer lower mold core (13) is fixed to the support plate (32) by bolts.

12. An optical lens injection mold assembly according to claim 1, characterized in that, The bottom of the outer lower mold core (13) is connected with a bottom plate (131). A fourth elastic member (132) is arranged between the top of the bottom plate (131) and the lower template (31), and the bottom abuts against the support plate (32).

13. An injection molding method for an injection molding die assembly of an optical lens, characterized in that, Including an optical lens injection mold assembly according to any one of claims 1-12, the injection method includes the following steps: Step 1, injection molding is carried out into the mold core structure (1) through the sprue bushing (24), so that the lens (4) is formed in the mold core structure (1), and the ejector part (5) is formed between the sprue bushing (24) and the mold core structure (1). Step 2, the upper template (21) moves upward and separates from the lower template (31) to start demolding. The upper die insert (231) moves downward relative to the upper template (21) under the action of the first elastic member (232) to continuously press against the lens (4) and the ejector part (5). The upper mold core (11) and the sprue bushing (24) move upward following the upper template (21). The upper mold core (11) separates from the upper surface of the lens (4), and the sprue bushing (24) separates from the ejector part (5). Step 3, the upper template (21) continues to move upward. The first ejector rod (211) moves downward relative to the upper template (21) under the action of the second elastic member (212) to continuously press against the lower template (31), so that the lower template (31) remains stationary. The upper die insert (231) stops moving relative to the upper template (21) under the action of the first limiting member (233). The upper die insert (231) moves upward following the upper template (21), and the upper die insert (231) separates from the lens (4) and the ejector part (5). Step 4, the upper template (21) continues to move upward. The first ejector rod (211) reaches the maximum moving distance. The first ejector rod (211) moves upward following the upper template (21), and the first ejector rod (211) separates from the lower template (31). The second ejector rod (341) moves upward under the action of the third elastic member (342) and drives the lower template (31) to move upward. The lower template (31) separates from the support plate (32). The lower template (31) drives the inner lower mold core (12) and the lens (4) to move upward, and the side surface of the lens (4) separates from the outer lower mold core (13). Step 5, the lower template (31) stops moving under the action of the second limiting member (346). The push rod (351) pushes the ejector plate (352) and the two demolding ejector pins (353) to move upward. The demolding ejector pins (353) drive the ejector part (5) and the lens (4) to move upward. The lower surface of the lens (4) separates from the inner lower mold core (12), and demolding is completed to remove the lens (4).

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