Injection mold for producing optical lens

Abstract

The utility model discloses an injection mold for producing an optical lens, which comprises a lower mold provided with a lower mold core and an upper mold provided with an upper mold core, the bottom of the upper mold core is in contact with the top of the lower mold core to form an injection molding cavity, the injection molding cavity is used for injecting an injection molding material to form the optical lens, and the injection mold also comprises an annular sealing ring; an annular groove for mounting an annular sealing ring is formed in a parting surface of the lower mold; the lower mold core is positioned in an annular shape of the annular groove; a closed space is formed among the parting surface of the lower die, the parting surface of the upper die and the annular sealing ring; the parting surface of the lower mold is further provided with an exhaust hole and an exhaust groove which are communicated to the air exhaust connector, the exhaust hole is located in the annular shape of the annular groove, and the exhaust groove is used for communicating the injection molding cavity with the exhaust hole; the air exhaust connector is connected with vacuumizing equipment and used for extracting air in the closed space. According to the utility model, the injection molding cavity can be filled more fully, air marks are reduced, and the qualified rate of lenses is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical lens injection molding technical field especially relates to a kind of injection mold for producing optical lens. BACKGROUND

[0002] The function and performance of imaging lens on the market are higher and higher, so the appearance and performance of single lens are also required to improve, and the gas (gas) produced by the decomposition of injection material melting in the injection process of lens is one of the factors that affect the appearance of lens most.In the injection process of lens, if there are more initial air, initial moisture and gas produced by material decomposition in the cavity, it will lead to insufficient filling in the process of filling cavity, local gas, so that weld line will be generated on lens, and lens appearance is unqualified, and the burnt material and gas adhere to the mold core, so that the mold core needs to be reprocessed in a short period of time, which increases the mold maintenance cost and production cost. SUMMARY

[0003] The utility model solves the technical problem to provide a kind of injection mold for producing optical lens, can make injection cavity fill more fully, reduce gas mark, improve the qualified rate of lens.

[0004] In order to solve the above technical problems, the utility model discloses an injection mold for producing optical lens, the injection mold includes the lower mould installed with lower mould core and the upper mould installed with upper mould core, the upper mould covers the lower mould, the bottom of upper mould core is concave, the top of lower mould core is convex, the bottom of upper mould core contacts with the top of lower mould core to form injection cavity, the injection cavity is used for injecting injection material to form optical lens, and further includes annular sealing ring;

[0005] The parting surface of the lower mould is provided with annular groove for installing the annular sealing ring, and the lower mould core is located in the annular groove.

[0006] The parting surface of the lower mould, the parting surface of the upper mould and the annular sealing ring form a closed space.

[0007] The parting surface of the lower mould is further provided with exhaust hole and exhaust groove communicated to exhaust joint, the exhaust hole is located in the annular groove, and the exhaust groove is used for connecting the injection cavity and the exhaust hole;The exhaust joint is connected to vacuum extraction equipment for extracting gas in the closed space.

[0008] As an optional embodiment, the shape of the annular groove is circular, square, rectangular, square-like with rounded corners or rectangular-like with rounded corners.

[0009] As another optional embodiment, the material of the annular sealing ring is fluorine rubber.

[0010] As a further alternative embodiment, the annular sealing ring is adhered to the annular groove by high-temperature resistant glue.

[0011] As a further alternative embodiment, a series of vent grooves are arranged on the parting surface of the lower mold, and the series of vent grooves are used to connect two adjacent vent holes.

[0012] As a further alternative embodiment, the thickness of the annular sealing ring is 0.5-2mm larger than the depth of the annular groove.

[0013] As a further alternative embodiment, the cross section of the annular groove is inverted trapezoidal.

[0014] As a further alternative embodiment, the flatness and parallelism of the parting surface of the lower mold and the parting surface of the upper mold are both not more than 0.01mm.

[0015] As a further alternative embodiment, the dimensional tolerance of the depth of the annular groove is within ±0.02mm.

[0016] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0017] The embodiments of the present application are provided with the exhaust hole and the exhaust groove, which are used to make the gas generated in the injection molding cavity of the optical lens smoothly exhaust out of the mold, make the injection molding cavity more fully filled, avoid the gas remaining in the cavity to pollute the appearance of the lens, thereby reducing the gas marks and improving the qualified rate of the lens. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] Figure 1 is a structure schematic view of an injection mold for producing optical lenses disclosed by the embodiments of the present application;

[0020] Figure 2 is a partial enlarged schematic view of part A in Figure 1

[0021] Figure 3 is a top view structure schematic view of a lower mold of an injection mold for producing optical lenses disclosed by the embodiments of the present application. DETAILED DESCRIPTION ​

[0022] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Referring to Figures 1 to 3 The injection mold for producing optical lenses comprises a lower mold 1 provided with a lower mold core 11 and an upper mold 2 provided with an upper mold core 21, the upper mold 2 covers the lower mold 1, the bottom of the upper mold core 21 is concave, the top of the lower mold core 11 is convex, the bottom of the upper mold core 21 and the top of the lower mold core 11 are in contact to form an injection cavity 4, and the injection cavity 4 is used for injecting injection material to form an optical lens. Wherein, the injection mold further comprises an annular sealing ring 3.

[0024] The parting surface of the lower mold 1 is provided with an annular groove 12 for mounting the annular sealing ring 3, and the lower mold core 11 is located in the annular groove 12.

[0025] The parting surface of the lower mold 1, the parting surface of the upper mold 2 and the annular sealing ring 3 form a closed space.

[0026] The parting surface of the lower mold 1 is further provided with an exhaust hole 13 and an exhaust groove 14 connected to an exhaust joint 5, the exhaust hole 13 is located in the annular groove 12, the exhaust groove 14 is used for connecting the injection cavity 4 and the exhaust hole 13, and the exhaust joint 5 is connected to a vacuum pumping device for pumping gas in the closed space.

[0027] In the embodiment, the injection mold is provided with the exhaust hole 13 and the exhaust groove 14, which are used for smoothly discharging the gas generated in the injection cavity 4 of the optical lens out of the mold, making the injection cavity 4 more fully filled, avoiding the gas remaining in the cavity to pollute the appearance of the lens, thereby reducing the gas marks and improving the qualified rate of the lens.

[0028] In an optional embodiment, the annular groove 12 is circular, square, rectangular, square-like with rounded corners or rectangular-like with rounded corners.

[0029] In another optional embodiment, the material of the annular sealing ring 3 is fluororubber.

[0030] In another optional embodiment, the annular sealing ring 3 is bonded to the annular groove 12 by high-temperature resistant glue. In another optional embodiment, the annular sealing ring 3 is bonded to the annular groove 12 by high-temperature resistant glue.

[0031] In yet another optional embodiment, a series of vent grooves are arranged on the parting surface of the lower mold 1, and the series of vent grooves are used to communicate two adjacent vent holes.

[0032] In yet another optional embodiment, the thickness of the annular sealing ring 3 is 0.5-2mm larger than the depth of the annular groove 12.

[0033] In yet another optional embodiment, the cross section of the annular groove 12 is inverted ladder-shaped.

[0034] In yet another optional embodiment, the flatness and parallelism of the parting surface of the lower mold 1 and the parting surface of the upper mold 2 are both not more than 0.01mm.

[0035] In yet another optional embodiment, the dimensional tolerance of the depth of the annular groove 12 is within ±0.02mm.

[0036] In actual use, after the external vacuumizing equipment and the mold are installed on the injection molding machine, the starting time and the ending point of the work of the vacuumizing equipment are set on the parameter adjustment panel of the injection molding machine, and then the molding process setting of the product is performed. In the process of starting to dissolve the plastic, the vacuumizing equipment can start to work, and the air in the cavity 4 of the mold parting surface and the mold core part is extracted through the exhaust hole 13.

[0037] The utility model is suitable for the condition that the material is easy to decompose gas in optics, and the accumulation of gas affects the appearance of the product and the performance of the lens. The utility model has very good effect in the actual production application of the factory for many years, and can completely meet the requirements of the Japanese customer product which has strict precision requirement. The structure can make the air in the mold cavity quickly exhaust outside the mold, and the cavity can form stable vacuum degree more quickly. Compared with the traditional molding process, the time period of gas exhaust is reduced, the molding period of the mold is shortened, the cost is reduced, the mold is more stable in the long-time production process, and the function and quality of the injection molding product are stable.

[0038] The utility model discloses the content disclosed only for the preferable embodiment of the utility model, is only used for explaining the technical scheme of the utility model, and is not limited to it. Although the utility model has been explained in detail with reference to the foregoing embodiment, those skilled in the art should understand that the technical scheme recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently. These modifications or replacements do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of the embodiments of the utility model.

Claims

1. An injection mold for producing optical lenses, comprising a lower mold with a lower mold core installed and an upper mold with an upper mold core installed, the upper mold core covering the lower mold core, the upper mold core having a concave bottom and a convex top of the lower mold core, the bottom of the upper mold core contacting the top of the lower mold core to form an injection cavity, the injection cavity being used to inject injection molding material to form an optical lens, characterized in that: Also included is an annular seal; An annular groove for mounting the annular sealing ring is provided on the parting surface of the lower mold, and the lower mold cores are all located in the annular shape of the annular groove; A closed space is formed between the parting surface of the lower mold, the parting surface of the upper mold and the annular sealing ring; The parting surface of the lower mold is also provided with an exhaust hole and an exhaust groove connected to the exhaust joint. The exhaust hole is located in the ring shape of the annular groove, and the exhaust groove is used to connect the injection molding cavity with the exhaust hole; the exhaust joint is connected to the vacuum equipment for extracting the gas in the enclosed space.

2. The injection mold according to claim 1, characterized in that The shape of the annular groove is circular, square, rectangular, a square-like shape with four arc-shaped corners, or a rectangle-like shape with four arc-shaped corners.

3. The injection mold according to claim 1, characterized in that The material of the annular sealing ring is fluororubber.

4. The injection mold according to claim 1, characterized in that The annular sealing ring is bonded to the annular groove by high temperature resistant glue.

5. The injection mold according to claim 1, wherein: The thickness of the annular sealing ring is 0.5 to 2 mm greater than the depth of the annular groove.

6. The injection mold according to claim 1, characterized in that The cross section of the annular groove is in the shape of an inverted trapezoid.

7. The injection mold according to claim 1, characterized in that The flatness and parallelism of the parting surface of the lower mold and the parting surface of the upper mold do not exceed 0.01 mm.

8. The injection mold according to claim 1, characterized in that The dimensional tolerance of the depth of the annular groove is within ±0.02 mm.

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