CN109664476B

CN109664476B - Optical lens mold demolding structure capable of avoiding deformation during molding and demolding

Info

Publication number: CN109664476B
Application number: CN201910017973.9A
Authority: CN
Inventors: 郎欢标
Original assignee: Mikolta Optical Technology Co ltd
Current assignee: Mikolta Optical Technology Co ltd
Priority date: 2019-01-08
Filing date: 2019-01-08
Publication date: 2024-05-28
Anticipated expiration: 2039-01-08
Also published as: CN109664476A

Abstract

The invention discloses an optical lens mold demolding structure capable of avoiding deformation during molding and demolding, which comprises an optical lens, and a conformal ejection pin arranged below the edge of the optical lens, wherein the optical lens comprises a lens main body, the edge of the lens main body is provided with a flange edge, the side surface of the flange edge is provided with a clearance groove which is opened towards the center direction of the lens main body, one side of the top of the conformal ejection pin, which faces the clearance groove, is provided with a conformal step with a shape corresponding to the clearance groove, the thickness error of the optical lens manufactured by the method can be ensured to be within three micrometers, the eccentric error can be controlled within 1.5 micrometers, the inclination of each surface can be controlled within 0.016 DEG, and in addition, the surface error of the lens after injection molding shrinkage can be controlled within one Newton ring. The assembly yield of the mobile phone lens module is greatly improved, and the yield can be controlled to be more than 80%.

Description

Optical lens mold demolding structure capable of avoiding deformation during molding and demolding

Technical Field

The invention relates to the field of injection molding of optical plastic lenses, in particular to an optical lens mold demolding structure capable of avoiding deformation during molding and demolding.

Background

Because the plastic lens has the advantages of good shape plasticity, light weight, difficult fracture, high toughness, capability of adopting a die for mass production, high production efficiency, low cost, wider application range and the like. So that the plastic lens is more and more widely applied in the photoelectric industry.

After the existing plastic lens is molded in the mold, the existing plastic lens is ejected out of one side of the mold in a specific mode practically and reliably, and the optical lens cannot be deformed in the process, so that a clear design effect cannot be achieved. This particular device is the ejector system. In addition, the device must be able to ensure that, when the mold is closed, the device returns to the initial position before ejection without interfering with other parts of the mold, so as to perform repeated injection molding (ejection).

In designing the ejection system of a mold, the mold designer first needs to determine the mold retention pattern of the optical lens, the ejection system must be built into the mold section where it is retained, and typically, most of the ejection systems of the mold are installed in moving molds, to improve efficiency, shorten cycle time and automate, not only to smooth demolding, but also to have a specific demolding pattern for the plastic in the runner. The ejection system is required to accurately release the optical lens without deformation within a predetermined period of time.

The most common demolding mode of the injection molding of the existing optical lens is a mode of ejecting an ejection pin (also called an ejector pin or an ejector rod), and the ejection pin is generally arranged at one side of a movable die; because the plastic part is generally left on one side of the movable mould for ejection. The contact surface between the ejection pin and the plastic part is the position (generally the flange edge position of the lens) of the edge of the optical lens, which has the least influence on the optical effect, so as to ensure that the precision of the optical curved surface in the effective aperture of the optical lens is not influenced. The ejection pins are uniformly distributed on the periphery of the optical lens, and the ejection force acts on the part with the largest bearing force of the plastic part. To prevent deformation and damage. The ejection mechanism is stable, smooth, flexible, reliable, high in strength and wear resistance, stable, smooth, free of clamping stagnation, convenient to manufacture and easy to maintain.

In the conventional injection molding technology of optical lenses, the ejection pin is ejected in the manner shown in fig. 1 to 4. In the drawing, 1 is a fixed template, 2 is a cavity, 30 is a plastic optical lens, the partial enlarged view of the cavity is shown on the right side of fig. 2 and the left side of fig. 4,4 or more ejection pins 32 and 31 are uniformly arranged on a round flange edge on the outer side of the cavity, and the plastic optical lens is a runner for plastic injection molding. When the mobile phone lens is injection molded, as the mobile phone lens is a tiny aspheric surface, the mobile phone lens is extremely sensitive to the inclination, concentricity and thickness of the lens, when the optical lens is ejected and demolded by adopting a common ejection pin (or called a push rod) ejection mode, if the ejection pin is provided with a sharp edge at the extraction position, the tiny sharp edge can cause the uneven thickness of the flange edge of the mobile phone lens, so that the mobile phone lens is almost completely invalid to assemble, and the yield is extremely low.

For lenses of camera modules of mobile phones, some existing manufacturers have improved the method of ejecting pins (or ejector pins). Namely, a hollow concave surface is formed at the contact position of the lower surface (or the upper surface) of the flange edge and the ejection pin, and the hollow concave surface is slightly recessed, such as the concave surface 301 in fig. 4, so that even if the ejection pin is extracted to generate a sharp, the sharp is in the concave surface, the flange edge of the optical lens can be ensured to be absolutely smooth, and the assembly precision of the lens of the mobile phone can be ensured. The method for ejecting the pins of the mobile phone lens is commonly called as a 'crater', namely, a 'crater' is pre-processed at the flange edge of the optical lens contacted with the pins, and the edge-cutting error of the pins caused by demolding is controlled within the 'crater'.

The "crater" ejection method may be applicable to lenses with relatively large flange edges, such as the first or second two optical lenses near the front of the lens, with relatively wide flange edges, with sufficient positions to place the "crater" concave surface for clearance and ejection pins. However, for the lens close to the image sensor, the flange edge is usually narrow due to the limitation of the diameter of the lens barrel of the mobile phone camera module, the narrowest flange edge is usually only about 0.1 mm-0.2 mm, the minimum diameter of the ejection pin is 0.4 mm-0.5 mm, the diameter of the ejection pin exceeds the width of the flange edge of the optical lens, and in this case, the ejection pin can be arranged on the flange edge of the optical lens.

For lenses with narrower flange edges or no flange edges at all, the ejection mode of the crater is not applicable, and the current common practice in the industry is to directly eject (or push) the whole mold core for ejection and demolding. As shown in fig. 3 to 6, 21 is a fixed mold plate, 22 is a cavity, 230 is a plastic optical lens, the partial enlarged view of which is shown in fig. 4 and 6, the outer ring of the optical lens is not provided with any ejection pin, and 231 is a plastic runner during injection molding. As shown in fig. 8, the aspherical mold core 232 serves as an ejector pin, and when injection molding is completed, the ejector module pushes it forward under the action of a spring, and the entire mold core 232 is ejected upward, thereby performing demolding of the lens 230.

The demolding technology of the whole mold core ejection is directly adopted, and the mold core is an ejection module, so that when the mold core is ejected, the whole surface of the lens is uniformly contacted in the ejection process, the deformation of the lens in the ejection process is smaller, and a higher surface type error can be ensured. However, in the injection molding and demolding process, abrasion is caused between the outer wall of the mold core and the sleeve of the mold plate due to back and forth pumping of the mold core, concentricity of the mold core becomes worse and worse, and meanwhile, errors exist in the ejection and resetting processes of the mold core, so that errors exist in the thickness of the lens. Therefore, the demolding technology of directly adopting the mold core ejection is unstable to the precision requirement of the lens of the mobile phone camera, and the eccentric error and the thickness error of the lens are serious, so that the production yield is greatly reduced.

In the prior art, a push-tube ejection scheme is also adopted, namely, a sleeve capable of being pushed out is arranged on the flange edge of the outer ring of the optical lens, the injection-molded optical lens is ejected by pushing the sleeve, but the problem of abrasion between a mold core and the sleeve exists, and the concentricity and the gradient of the mold core cannot be ensured to be within the required range

Under the condition that the existing demolding and ejection technology for injection molding of the mobile phone lens has difficulty, the current common practice in the industry is to directly perform demolding and ejection on the lens together with the solidified pouring runner after injection molding and mold opening without adopting any scheme of ejecting pins, pushing mold cores and jacking pipes, and then take out the lens manually or directly take out the lens by using a mechanical arm. This method can ensure that the thickness and decentration of the lens are not greatly affected, but because the stress of the lens at the position close to the gate and other positions is inconsistent under the condition that the lens is pulled out by hard force during demolding, the phenomenon of asymmetrical sub-ss (AS) in the X and Y directions of the lens is easy to occur, and when the surface type is measured by an interferometer, the locally asymmetrical interference fringes similar to those shown in fig. 9 can be observed. When the profile meter is used for measurement, the situation shown in fig. 10 can be generally seen, and the two profile curves measured in the X and Y directions are seriously misaligned. Fig. 10 shows the phenomenon of a mobile phone lens showing that the PV values differ by about 0.5um (about approaching two newton rings) over a diameter of 1.6 mm. The problem of subs can cause asymmetric definition in the X and Y directions when the mobile phone camera module shoots, and in general, severe problems can occur when subs in the X and Y directions exceed 1 newton ring (the asymmetric surface error of X and Y is about 0.3 μm), which mainly appears as follows: the local area of the picture can generate double images and even be completely blurred, so that the yield of the mobile phone camera module is greatly reduced.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides an optical lens mold demolding structure capable of avoiding deformation during molding and demolding.

In order to achieve the above-mentioned purpose, the invention provides an optical lens mold demolding structure capable of avoiding deformation during molding and demolding, comprising an optical lens, and a conformal ejection pin arranged below and beside the edge of the optical lens, wherein the optical lens comprises a lens main body, the edge of the lens main body is provided with a flange edge, the side surface of the flange edge is provided with a clearance groove which is opened towards the center direction of the lens main body, the conformal ejection pin is arranged at the clearance groove position of the side of the optical lens, the projection part of the conformal ejection pin is intersected with the contour position of a local lens, the top of the conformal ejection pin is provided with a conformal step, the conformal step wraps the outer side surface of the clearance groove of the flange edge of the optical lens, the conformal step has local contour characteristics of the edge position of the optical lens, and the section shape of the conformal step is matched with the local section contour line of the edge position of the optical lens.

Preferably, the mold further comprises mold legs, a supporting plate arranged above the mold legs, a rear mold plate arranged above the supporting plate, a lower mold arranged in the rear mold plate, a fixed mold plate arranged above the rear mold plate, a cavity corresponding to the lower mold arranged in the fixed mold plate, a runner arranged between the cavity and the lower mold, and an ejector arranged on the side edge of the rear mold plate, wherein the conformal ejector pins are in transmission connection with the ejector, and penetrate through the supporting plate and the lower mold to extend into the lower side and the side edge of the flange edge of the optical lens.

Preferably, the runner comprises a plurality of runner branches which are circularly arranged, and the die leg is also provided with a central ejection pin extending into the lower part of the center of the runner and a middle ejection pin extending into the lower part of the branch.

Preferably, the shape-preserving ejection pin is one, the clearance groove is arranged on the flange edge of one side opposite to the optical lens and the runner, and the shape-preserving ejection pin is also arranged below the flange edge of the optical lens opposite to the runner and corresponds to the clearance groove.

Preferably, the two or more conformal ejection pins are arranged below and beside the flange edge of the optical lens, and the clearance grooves are arranged in the number corresponding to the pins and are uniformly distributed and arranged on the side surface of the flange edge of the optical lens corresponding to the conformal ejection pins.

Preferably, the flange edge of the optical lens mold core is provided with a conformal ejector pin pinhole for placing a conformal ejector pin.

Preferably, the shape of the end face of the conformal ejection pin is round, semicircular, elliptic, D-shaped or polygonal.

Preferably, the optical lens has a circular shape, a semicircular shape, an elliptical shape, a D-shape or a polygonal shape.

Preferably, the material of the optical lens is an optically transparent resin for injection molding or an optically transparent resin for compression molding.

Compared with the prior art, the invention has the beneficial effects that:

The invention comprises an optical lens, a conformal ejection pin arranged at the edge of the optical lens, the optical lens comprises a lens main body, the edge of the lens main body is provided with a flange edge, the side surface of the flange edge is provided with a clearance groove which is arranged towards the center direction of the lens main body, one side of the top of the conformal ejection pin towards the clearance groove is provided with a conformal step which is corresponding to the clearance groove in shape, the thickness error of the optical lens manufactured by the invention can be ensured to be within three micrometers, the eccentric error can be controlled within 1.5 micrometers, the inclination of each surface can be controlled within 0.016 DEG, and in addition, the surface type error of the lens after injection molding shrinkage can be controlled within one Newton ring. The assembly yield of the mobile phone lens module is greatly improved, and the yield can be controlled to be more than 80%.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a top view of a prior art ejector structure employing ejector pins;

Fig. 2 is an enlarged view of a portion a in fig. 1;

FIG. 3 is a front view of a prior art ejector structure employing ejector pins;

fig. 4 is an enlarged view of a portion B in fig. 3;

FIG. 5 is a top view of a prior art ejector structure employing ejection of a full mold core;

fig. 6 is an enlarged view of a portion C in fig. 5;

FIG. 7 is a front view of a prior art ejector structure for ejecting a complete mold core;

fig. 8 is an enlarged view of a portion D in fig. 7;

FIG. 9 is a diagram of the optical lens sub-Sitting effect observed using an interferometer;

fig. 10 is a case analysis diagram of the optical lens X and Y direction surface type errors due to the subs phenomenon;

FIG. 11 is a three-dimensional isometric exploded view of a mold that avoids deformation during mold release provided in accordance with one embodiment;

Fig. 12 is an enlarged view of the portion E in fig. 11;

FIG. 13 is a three-dimensional front exploded view of a mold for avoiding deformation at the time of molding and demolding provided in the first embodiment;

FIG. 14 is a top view of a mold for avoiding deformation during molding and demolding according to the first embodiment;

FIG. 15 is A cross-sectional view of A-O-A of FIG. 14;

FIG. 16 is an isometric view of a lower mold of a mold that avoids deformation during demolding in accordance with one embodiment;

FIG. 17 is a top view of FIG. 16;

FIG. 18 is a bottom view of FIG. 16;

FIG. 19 is an isometric view of a mold release structure of an optical lens mold with channels engaging an optical lens to avoid deformation during mold release;

fig. 20 is an enlarged view of F in fig. 19;

FIG. 21 is an isometric view of a conformal ejector pin that avoids deformation during mold release provided in accordance with one embodiment;

Fig. 22 is an enlarged view of a portion G in fig. 21;

Fig. 23 is a schematic diagram of a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release according to the first embodiment;

Fig. 24 is an analysis chart of the situation of the surface type errors in the X and Y directions of the optical lens ejected by the optical lens mold release structure for avoiding deformation at the time of molding and releasing according to the first embodiment;

fig. 25 is a schematic diagram of a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release;

Fig. 26 is a schematic diagram of a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release according to the third embodiment;

Fig. 27 is a schematic view of a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release according to a fourth embodiment;

Fig. 28 is a schematic diagram of a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release;

fig. 29 is a schematic view of a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release according to a sixth embodiment;

fig. 30 is a schematic diagram of a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release;

FIG. 31 is a schematic view showing a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release;

Fig. 32 is a schematic diagram of a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release according to a ninth embodiment;

Fig. 33 is a schematic view of a process of ejecting an optical lens by a conformal ejection pin of an optical lens mold release structure for avoiding deformation during molding and release according to the tenth embodiment.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The embodiment of the invention provides an optical lens mold demolding structure capable of avoiding deformation during molding and demolding.

Example 1

Referring to fig. 11 to 24, the present invention provides an optical lens mold demolding structure capable of avoiding deformation during molding and demolding. Comprises a die leg 1100, a supporting plate 1090 arranged above the die leg 1100, a rear die plate 1080 arranged above the supporting plate 1090, a lower die 1040 arranged in the rear die plate 1080, a fixed die plate 1020 arranged above the rear die plate 1080, a cavity 1030 arranged in the fixed die plate 1020 and corresponding to the lower die 1040, a runner 1051 arranged between the cavity 1030 and the lower die 1040, the runner 1051 comprises eight branch flows which are circularly arranged, the outer end parts of the branch flows form an optical lens 1050, the optical lens 1050 comprises a lens main body, the edge of the lens main body is provided with a flange edge, the side surface of the flange edge is provided with a clearance groove 1052 which is arranged towards the center direction of the lens main body, a shape-preserving ejection pin 1060 arranged on the die leg 1100 and penetrating through the supporting plate 1090 and the lower die 1040 to extend to the lower part below the flange edge of the optical lens 1050, and an ejection device arranged on the side edge of the rear die plate 1080, the ejector device is provided with a central ejector pin extending to the center lower part of the runner 1051 and a middle ejector pin 1063 extending to the lower part of the branch, the outer ring of the flange edge of the lower die 1040 is provided with a conformal ejector pin hole for placing the conformal ejector pin 1060, the inner ring of the flange edge of the lower die 1040 is provided with a middle ejector pin hole for placing the middle ejector pin 1063, the center of the lower die 1040 is provided with a middle ejector pin hole for placing the central ejector pin, the conformal ejector pin 1060 is in transmission connection with the ejector device and extends to the lower part of the flange edge of the optical lens 1050 through the conformal ejector pin hole through the supporting plate 1090 and the lower die 1040, the conformal ejector pin 1060 is arranged at the position of the empty-keeping groove 1052 on the side of the optical lens 1050, the projection part of the conformal ejector pin 1060 is intersected with the contour position of the local optical lens 1050, the top of the conformal ejector pin 1060 is provided with a conformal step 1061, the shape-keeping step 1061 wraps the outer side surface of the hollow recess 1052 of the flange edge of the optical lens 1050, the shape-keeping step 1061 has a local contour feature of the edge position of the optical lens 1050, and the cross-sectional shape of the shape-keeping step completely coincides with the local cross-sectional contour line of the edge position of the optical lens 1050.

Referring to fig. 14, eight cavities for forming the optical lens 1050 are uniformly arranged between the lower mold 1040 and the cavity 1030, and the eight cavities are communicated by a branching flow of the flow channel 1051.

Molten plastic liquid injected from the sprue bush 1010 during injection molding enters the eight cavities simultaneously through the runners 1051, and after mold locking and pressure maintaining, the plastic material of the optical lens 1050 is cooled. After molding and cooling, the injection molding machine control mechanism pulls back mold plate 1080 apart, and simultaneously ejects ejector pins 1060 through ejector devices provided on the sides of back mold plate 1080, thereby demolding injection molded optical lens 1050.

The conformal ejector pins 1060 are arranged in two and equidistantly and evenly below the flange of the optical lens 1050, and the corresponding side surfaces of the clearance grooves 1052 arranged in two and evenly open to the flange of the optical lens 1050 correspond to the conformal ejector pins 1060. That is, the flange edge of optical lens 1050 is slightly recessed in the radial direction toward the center of optical lens 1050 at the location where it contacts conformal step 1061 of conformal ejector pin 1060, forming a clearance groove 1052, which remains within this recessed range even if a sharp edge is created when conformal ejector pin 1060 is withdrawn, and does not affect the outer diameter, thickness, and eccentricity errors of the flange edge.

The shape-keeping step 1061 is partially machined by ultra-precise machining to have the same contour shape as the clearance groove 1052 of the flange edge of the optical lens 1050, which ensures that the shape of the edge of the optical lens 1050, the shape and thickness of the flange edge are not changed during the ejection of the optical curved surface of the optical lens 1050 after injection molding.

The flange edge of optical lens 1050 is provided with a clearance groove 1052, typically in the radial 1-to-2-wire range, at a location radially in contact with conformal step 1061 of conformal ejector pin 1060.

The two conformal ejection pins 1060 and the middle ejection pin are provided with three ejection pins in total, and the three ejection pins are uniformly distributed around the optical lens 1050 at intervals of 120 degrees, so that the stress balance of the optical lens 1050 in all directions is ensured when the optical lens 1050 is demolded, the optical curved surface of the optical lens 1050 is not deformed, the surface type error of the optical lens 1050 is ensured to be accurately controlled, and the problem of low yield of the traditional mobile phone lens caused by Asian (AS) in the ejection process is effectively solved. Ensuring good repeatability of the miniature optical lens 1050 during production and high precision.

The result of actual measurement of the contour lines of the optical lens 1050 ejected according to the present embodiment along two different directions X and Y is shown in fig. 24. It can be seen that the two directions of the surface patterns are very well matched, and the phenomenon of subus is effectively eliminated. The thickness error of the lens can be ensured to be within 3 micrometers, the eccentric error can be controlled to be within 1.5 micrometers, the inclination of each surface can be controlled to be within 0.016 DEG, and the Asian and surface type errors of the optical lens 1050 after the injection molding shrinkage can be controlled to be within 1 Newton ring. The assembly yield of the mobile phone lens module is greatly improved, and the yield can be controlled to be more than 80%.

In this embodiment, the end surfaces of conformal ejector pins 1060 are circular in shape and the optical lens is circular in shape.

The material of the optical lens is optical transparent resin for injection molding or optical transparent resin for compression molding.

Example two

Referring to fig. 25, the present invention provides an optical lens mold demolding structure for avoiding deformation during molding and demolding, and the difference between the second embodiment and the first embodiment is that: the clearance groove 2052 is disposed on a flange edge of the optical lens 2050 opposite to the tributary of the flow channel 2051, and the conformal ejection pin 2060 is disposed at a flange edge position opposite to the tributary opening of the flow channel 2051 and corresponding to the clearance groove 2052. In this embodiment, two ejection pins are provided.

The molten plastic liquid injected from the sprue bush during injection enters the cavity of the optical lens 2050 through the runner 2051, and after mold locking and pressure maintaining, the cooling system cools the optical lens 2050 and the plastic material in the runner 2051. After molding and cooling, the demolding control mechanism of the injection molding machine pulls the rear mold plate open, and simultaneously, the optical lens 2050 and the runner 2051 are simultaneously ejected by the conformal ejection pins 2060 opposite to the runner 2051 and the middle ejection pins 2063 below the runner 2051 through the ejection device arranged on the side of the rear mold plate, so that the molded optical lens 2050 is demolded. Because the two ejection pins are respectively ejected upwards at two sides of the optical lens 2050 in each mold cavity during demolding, the optical lens 2050 is ensured to be stressed uniformly in all directions, so that the surface type error of an optical curved surface can be accurately controlled in the demolding process of the optical lens 2050, and meanwhile, the surface type precision of the edge of the optical lens 2050, the thickness, the outer diameter, the eccentricity and the concentricity error of the flange edge of the optical lens 2050 can be accurately controlled by the shape-preserving step 2061 of the shape-preserving ejection pin 2060. Effectively solves the problem of low yield caused by Asian (AS) in the ejection process of the traditional mobile phone lens. Ensuring good repeatability and high precision of the miniature optical lens 2050 in production.

Example III

Referring to fig. 26, the present invention provides an optical lens mold demolding structure for avoiding deformation during molding and demolding, and the difference between the third embodiment and the first embodiment is that: the end face of the conformal ejection pin 3060 is flat and oval.

The end surface of the conformal ejection pin 3060 is made into a step shape to form a conformal step 3061, and the conformal step 3061 of the conformal ejection pin 3060 is used for supporting the clearance groove 3052 on the narrow flange edge of the optical lens 3050 so as to eject and demold the optical lens 3050.

The molten plastic liquid injected from the sprue bush during injection molding enters the cavity of the optical lens 3050 through the runner 3051, and after mold locking and pressure maintaining, the cooling system cools the optical lens 3050 and the plastic material in the runner 3051. After molding and cooling, the demolding control mechanism of the injection molding machine pulls the rear mold plate open, and simultaneously, the conformal ejection pins 3060 and the middle ejection pins 3063 positioned below the runner 3051 simultaneously eject the optical lens 3050 and the runner 3051 through the ejection device arranged on the movable mold side, so that the molded optical lens 3050 is demolded. Since the three ejector pins are uniformly distributed around the optical lens 2050 in each mold cavity at 120 ° intervals, the optical lens 3050 is stressed uniformly in all directions, so that the surface errors of the optical curved surface can be precisely controlled in the demolding process of the optical lens 3050, and meanwhile, the shape-preserving steps of the shape-preserving ejector pins 3061 can precisely control the thickness, the outer diameter, the eccentricity and the concentricity errors of the flange edge of the optical lens 3050. Effectively solves the problem of low yield caused by Asian (AS) in the ejection process of the traditional mobile phone lens. Ensuring good repeatability and high precision of the miniature optical lens 3050 in production.

Example IV

Referring to fig. 27, the present invention provides an optical lens mold demolding structure for avoiding deformation during molding and demolding, and the fourth embodiment is different from the first embodiment in that: the end surface of the conformal ejection pin 4060 is fan-shaped.

The end surface of the conformal ejection pin 4060 is made into a step shape to form a conformal step 4061, and the conformal step 4061 of the conformal ejection pin 4060 is used for supporting the clearance groove 4052 on the narrow flange edge of the optical lens 4050 so as to eject and demold the optical lens 4050.

The molten plastic liquid injected from the sprue bush during injection molding enters the cavity of the optical lens 4050 through the runner 4051, and after mold locking and pressure maintaining, the cooling system cools the plastic material in the optical lens 4050 and the runner 4051. After molding and cooling, the demolding control mechanism of the injection molding machine pulls the rear mold plate open, and simultaneously, the conformal ejection pins 4060 and the middle ejection pins 4063 positioned below the runner 4051 simultaneously eject the optical lens 4050 and the runner 4051 through the ejection device arranged on the movable mold side, so that demolding of the injection molded optical lens 4050 is completed. Since the three ejection pins are uniformly distributed around the optical lens 4050 in each mold cavity at 120 ° intervals, the optical lens 4050 is stressed uniformly in all directions, so that the surface errors of the optical curved surface can be precisely controlled in the demolding process of the optical lens 4050, and the thickness, the outer diameter, the eccentricity and the concentricity errors of the flange edge of the optical lens 4050 can be precisely controlled by the conformal steps of the conformal ejection pins 4061. Effectively solves the problem of low yield caused by Asian (AS) in the ejection process of the traditional mobile phone lens. Ensuring good repeatability and high precision of the miniature optical lens 4050 in production.

Example five

Referring to fig. 28, the present invention provides an optical lens mold demolding structure for avoiding deformation during molding and demolding, and the fifth embodiment is different from the first embodiment in that: the end face of the conformal ejection pin 5060 is triangular.

The end surface of the conformal ejection pin 5060 is stepped to form a conformal step 5061, and the conformal step 5061 of the conformal ejection pin 5060 is used to support the clearance groove 5052 on the narrow flange side of the optical lens 5050, so as to eject and demold the optical lens 5050.

Molten plastic liquid injected from the sprue bush during injection molding enters the cavity of the optical lens 5050 through the runner 5051, and after mold locking and pressure maintaining, the cooling system cools the optical lens 5050 and the plastic material in the runner 5051. After molding and cooling, the demolding control mechanism of the injection molding machine pulls the rear mold plate open, and simultaneously, the conformal ejection pins 5060 and the middle ejection pins 5063 positioned below the runner 5051 eject the optical lens 5050 and the runner 5051 simultaneously through the ejection device arranged on the movable mold side, so that the demolding of the injection molded optical lens 5050 is completed. Since the three ejector pins are uniformly distributed around the optical lens 5050 in each mold cavity at 120 ° intervals, the optical lens 5050 is stressed uniformly in all directions, so that the surface errors of the optical curved surface can be precisely controlled in the demolding process of the optical lens 5050, and the conformal steps of the conformal ejector pins 5061 can precisely control the thickness, the outer diameter, the eccentricity and the concentricity errors of the flange edge of the optical lens 5050. Effectively solves the problem of low yield caused by Asian (AS) in the ejection process of the traditional mobile phone lens. Ensuring good repeatability and high precision of the miniature optical lens 5050 in production.

Example six

Referring to fig. 29, the present invention provides an optical lens mold demolding structure for avoiding deformation during molding and demolding, and the difference between the sixth embodiment and the first embodiment is that: the end surface of the conformal ejection pin 6060 is quadrilateral.

The end surface of the conformal ejection pin 6060 is made into a step shape to form a conformal step 6061, and the conformal step 6061 of the conformal ejection pin 6060 is used for supporting the clearance groove 6052 on the narrow flange edge of the optical lens 6050 so as to eject and demold the optical lens 6050.

The molten plastic liquid injected from the sprue bush during injection molding enters the cavity of the optical lens 6050 through the runner 6051, and after mold locking and pressure maintaining, the cooling system cools the plastic material in the optical lens 6050 and the runner 6051. After molding and cooling, the demolding control mechanism of the injection molding machine pulls the rear mold plate open, and simultaneously, the conformal ejection pin 6060 and the middle ejection pin 6063 positioned below the runner 6051 simultaneously eject the optical lens 6050 and the runner 6051 through the ejection device arranged on the movable mold side, so that demolding of the injection molded optical lens 6050 is completed. Since the three ejection pins are uniformly distributed around the optical lens 6050 in each mold cavity at 120 ° intervals, the optical lens 6050 is stressed uniformly in all directions, so that the surface errors of the optical curved surface can be precisely controlled in the demolding process of the optical lens 6050, and meanwhile, the shape-preserving steps of the shape-preserving ejection pins 6061 can precisely control the thickness, the outer diameter, the eccentricity and the concentricity errors of the flange edge of the optical lens 6050. Effectively solves the problem of low yield caused by Asian (AS) in the ejection process of the traditional mobile phone lens. Ensuring good repeatability and high precision of the miniature optical lens 6050 during production.

Example seven

Referring to fig. 30, the present invention provides an optical lens mold demolding structure for avoiding deformation during molding and demolding, and the difference between the seventh embodiment and the first embodiment is that: the end face of the conformal ejection pin 7060 is hexagonal. Of course, in other embodiments, the end shape of the conformal ejector pin 7060 may also be "D" shaped or other polygonal shapes.

The end surface of the conformal ejection pin 7060 is made into a step shape to form a conformal step 7061, and the conformal step 7061 of the conformal ejection pin 7060 is used for supporting the clearance groove 7052 on the narrow flange edge of the optical lens 7050 so as to eject and demold the optical lens 7050.

The molten plastic liquid injected from the sprue bush during injection molding enters the cavity of the optical lens 7050 through the runner 7051, and after mold locking and pressure maintaining, the cooling system cools the optical lens 7050 and the plastic material in the runner 7051. After molding and cooling, the demolding control mechanism of the injection molding machine pulls the rear mold plate open, and simultaneously, the optical lens 7050 and the runner 7051 are simultaneously ejected out through the conformal ejection pin 7060 and the middle ejection pin 7063 positioned below the runner 7051 by the ejection device arranged on the movable mold side, so that demolding of the molded optical lens 7050 is completed. Since the three ejector pins are uniformly distributed around the optical lens 7050 in each mold cavity at 120 ° intervals, the optical lens 7050 is stressed uniformly in all directions, so that the surface errors of the optical curved surface can be precisely controlled in the demolding process of the optical lens 7050, and meanwhile, the shape-preserving steps of the shape-preserving ejector pins 7061 can precisely control the thickness, the outer diameter, the eccentricity and the concentricity errors of the flange edge of the optical lens 7050. Effectively solves the problem of low yield caused by Asian (AS) in the ejection process of the traditional mobile phone lens. Ensuring good repeatability and high precision of the miniature optical lens 7050 during production.

Example eight

Referring to fig. 31, the present invention provides an optical lens mold demolding structure for avoiding deformation during molding and demolding, and the difference between the eighth embodiment and the second embodiment is that: the optical lens 8050 has a trapezoidal shape.

The end face of the conformal ejector pin 8060 is provided with a conformal step 8061. The keep-away grooves 8052 provided on the opposite side of the optical lens 8050 from the flow channel 8051 correspond to the conformal steps 8061.

The molten plastic liquid injected from the sprue bush during injection molding enters the cavity of the optical lens 8050 through the runner 8051, and after mold locking and pressure maintaining, the cooling system cools the optical lens 8050 and the plastic material in the runner 8051. After molding and cooling, the demolding control mechanism of the injection molding machine pulls the rear mold plate open, and simultaneously the optical lens 8050 and the runner 8051 are simultaneously ejected out by the conformal ejection pin 8060 positioned opposite to the runner 8051 and the middle ejection pin 8063 positioned below the runner 8051 through the ejection device arranged on the side of the rear mold plate, so that the molded optical lens 8050 is demolded. Because the two ejection pins are respectively arranged at two sides of the optical lens 8050 in each mold cavity, the two ejection pins are simultaneously ejected upwards during demolding, so that the optical lens 8050 is ensured to be stressed uniformly in all directions, the surface type error of an optical curved surface can be accurately controlled in the demolding process of the optical lens 8050, and meanwhile, the surface type precision of the edge of the optical lens 8050, the thickness, the outer diameter, the eccentricity and the concentricity error of the flange edge of the optical lens 8050 can be accurately controlled by the shape-preserving step 8061 of the shape-preserving ejection pin 2060. Effectively solves the problem of low yield caused by Asian (AS) in the ejection process of the traditional mobile phone lens. Ensuring good repeatability and high precision of the miniature optical lens 8050 in production.

Example nine

Referring to fig. 32, the present invention provides an optical lens mold demolding structure for avoiding deformation during molding and demolding, and the difference between the ninth embodiment and the first embodiment is that: the optical lens 9050 has a D-shape. Three conformal ejection pins 9060 are arranged on the left and right sides of the optical lens 9050 and on the edge positions opposite to the runner 9051. Four ejector pins are formed together with the intermediate ejector pins 9063 provided at the bottom of the tributary of the flow passage 9051.

The end of the conformal ejector pin 9060 is provided with a conformal step 9061. The optical lens 9050 is provided with a clearance groove 9052 at a position contacting with the conformal step 9061 of the conformal ejection pin 9060. The position of the ejector pin corresponds to the position of the demolding ejector pin completely; that is, the flange of the optical lens 9050 is slightly concave toward the center of the optical lens 9050 at the position where the flange radially contacts the conformal step 9061 of the conformal ejector pin 9060, so as to avoid the outer diameter, thickness and eccentric error of the flange caused by the sharp edge when the conformal ejector pin 9060 is withdrawn.

The molten plastic liquid injected from the sprue bush during injection molding enters the cavity of the optical lens 9050 through the runner 9051, and after mold locking and pressure maintaining, the cooling system cools the optical lens and the plastic material in the runner. After molding and cooling, the demolding control mechanism of the injection molding machine pulls the rear mold plate open, and simultaneously three conformal ejection pins 9060 positioned at the edge of the D-shaped optical lens 9050 and one middle ejection pin 9063 positioned below the runner 9051 simultaneously eject the optical lens 9050 and the runner 9051 through an ejection device arranged on the side of the rear mold plate, so that the molded optical lens 9050 is demolded. Because four ejection pins are uniformly arranged on the front, back, left and right of the optical lens 9050 in each die cavity, the four ejection pins are simultaneously ejected upwards during the demolding, so that the optical lens 9050 is ensured to be stressed uniformly in all directions, the surface type error of an optical curved surface can be accurately controlled in the demolding process of the optical lens 9050, and meanwhile, the surface type precision of the edge of the optical lens 9050, the thickness, the outer diameter, the eccentricity and the concentricity error of the flange edge of the optical lens 9050 can be accurately controlled by the shape-preserving steps of the shape-preserving ejection pins. Effectively solves the problem of low yield caused by Asian (AS) in the ejection process of the traditional mobile phone lens. Ensuring good repeatability and high precision of the miniature optical lens 9050 in production.

Examples ten

Referring to fig. 33, the present invention provides an optical lens mold demolding structure for avoiding deformation during molding and demolding, and the tenth embodiment differs from the first embodiment in that: the optical lens 10050 is elliptical in shape, the wider flange edges on the left and right sides of the optical lens 10050 are provided with first middle ejection pins 10062, the lower part of the tributary of the flow channel 10051 is provided with second middle ejection pins 10063, and the edge position of the optical lens 10050, which is opposite to the flow channel 10051, is provided with a conformal ejection pin 10060. The conformal ejector pins 10060 form four ejector pins with three middle ejector pins 10063 disposed on the bottom of the side stream of the flow channel 10051 and on the sides of the optical lens 10050.

The molten plastic liquid injected from the sprue bush during injection molding enters the cavity of the optical lens 10050 through the runner 10051, and after mold locking and pressure maintaining, the cooling system cools the optical lens and the plastic material in the runner. After molding and cooling, the demolding control mechanism of the injection molding machine pulls the rear mold plate open, and simultaneously, the two first middle ejection pins 10062 positioned at two sides of the oval-shaped light lens 10050, one second middle ejection pin 10063 positioned below the runner 10051 and the conformal ejection pin 10060 positioned at the edge position right opposite to the runner 10051 simultaneously eject the optical lens 10050 and the runner 10051 through the ejection device arranged at the side of the rear mold plate, so that the molded optical lens 10050 is demolded. Because the four ejection pins are uniformly arranged on the front, back, left and right sides of the optical lens 10050 in each mold cavity, the four ejection pins are simultaneously ejected upwards during demolding, so that the optical lens 10050 is ensured to be stressed uniformly in all directions, the surface type error of an optical curved surface can be accurately controlled during the demolding process of the optical lens 10050, and meanwhile, the surface type precision of the edge of the lens, the thickness, the outer diameter, the eccentricity and the concentricity error of the flange edge of the optical lens 10050 can be accurately controlled by the shape-preserving step of the shape-preserving ejection pins 10060. Effectively solves the problem of low yield caused by Asian (AS) in the ejection process of the traditional mobile phone lens. Ensuring good repeatability and high precision of the miniature optical lens 10050 during production.

Of course, in other embodiments, the optical lens 10050 may also have a triangular, quadrangular or other polygonal shape.

The mold stripping structure can be used for injection molding molds and compression molding molds.

The ejection device of the ejection control mechanism arranged on the movable mould side of the injection moulding machine can be combined with an ejection mode of a mechanical spring, a pneumatic ejection mode, a hydraulic ejection mode and an ejection mode of a cam screw.

The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims

1. The utility model provides an avoid deformation's optical lens mould drawing of patterns structure during shaping drawing of patterns, includes optical lens, sets up in the ejecting cotter of conformal at optical lens edge, its characterized in that: the optical lens comprises a lens main body, the edge of the lens main body is provided with a flange edge, the side surface of the flange edge is provided with a clearance groove which is opened towards the center direction of the lens main body, the conformal ejection pin is arranged at the clearance groove position of the side surface of the optical lens, the projection part of the conformal ejection pin is intersected with the contour position of the local optical lens, the top of the conformal ejection pin is provided with a conformal step, the conformal step wraps the outer side surface of the clearance groove of the flange edge of the optical lens, the conformal step is provided with local contour characteristics of the edge position of the optical lens, and the section shape of the conformal step is matched with the local section contour line of the edge position of the optical lens; the mold comprises a mold body, a mold foot, a supporting plate arranged above the mold foot, a rear mold plate arranged above the supporting plate, a mold core arranged in the rear mold plate, a fixed mold plate arranged above the rear mold plate, a cavity arranged in the fixed mold plate and corresponding to the mold core, a runner arranged between the cavity and the mold core, and an ejection device arranged on the side of the rear mold plate, wherein a conformal ejection pin is in transmission connection with the ejection device and extends to the lower part and the side of the flange edge of the optical lens through the supporting plate and the rear mold plate; the runner comprises a plurality of runner branches which are circularly arranged, and the die leg is also provided with a central ejection pin extending into the lower part of the center of the runner and an ejection pin extending into the lower part of the branch; the conformal ejection pin is arranged below and beside the flange edge of the optical lens opposite to the flow passage, and corresponds to the clearance groove; the conformal ejection pins are more than two and are arranged below and at the side of the flange edge of the optical lens at equal angular intervals, and the clearance grooves are arranged in the number corresponding to the conformal ejection pins and are uniformly arranged on the side surface of the flange edge of the optical lens corresponding to the conformal ejection pins.

2. An optical lens mold release structure avoiding deformation at the time of molding and release as claimed in claim 1, wherein: the flange edge of the optical lens mold core is provided with a conformal ejector pin pinhole for placing a conformal ejector pin.

3. An optical lens mold release structure avoiding deformation at the time of molding and release according to any one of claims 1 to 2, wherein: the end face of the conformal ejection pin is round, semicircular, elliptic, D-shaped or polygonal.

4. An optical lens mold release structure avoiding deformation at the time of molding and release according to claim 3, wherein: the optical lens is round, semicircular, elliptic, D-shaped or polygonal.

5. An optical lens mold release structure for avoiding deformation at the time of molding and release as claimed in claim 4, wherein: the material of the optical lens is optical transparent resin for injection molding or optical transparent resin for compression molding.