CN117656368A - Optical mould and injection moulding machine - Google Patents

Abstract

The embodiment of the application discloses an optical die and an injection molding machine, relates to the technical field of dies, and solves the problem that a lens manufactured by the existing optical die is easy to deform in demolding. The movable template and the fixed template in the optical mould are arranged oppositely, and the pushing piece is movably arranged in the movable template. The movable mould core is arranged in the movable mould plate and the pushing piece and is opposite to the fixed mould core. The surface of the fixed die core, which is close to the movable die core, is provided with a first main body cavity surface. An annular outer diameter cavity surface is formed on the fixed die core along the periphery of the first main body cavity surface. The annular outer diameter cavity surface forms the outer side surface of the lens. A second main body cavity surface is formed on the surface of the movable die core, which is opposite to the first main body cavity surface. The annular outer diameter cavity surface and the second main body cavity surface are connected with a partial area of the pushing piece, which is close to one side surface of the fixed template; the first main body cavity surface, the annular outer diameter cavity surface, the second main body cavity surface and a part of the area of one side surface of the pushing piece, which is close to the fixed die plate, enclose a cavity for forming a lens.

Description

Optical mould and injection moulding machine

Technical Field

The application relates to the technical field of molds, in particular to an optical mold and an injection molding machine.

Background

With the rapid development of consumer electronic products, especially the full popularization of smart phones, camera modules equipped on smart phones are also being continuously upgraded to meet the functional and quality requirements of consumers for camera shooting. The lens in the camera module can be divided into a glass lens, a plastic lens, a glass-plastic mixed lens and the like according to manufacturing materials. Among them, plastic lenses are most widely used.

The existing plastic lenses are produced by injecting molten plastic into an optical mold, and demolding the plastic from the optical mold after the plastic is cooled and solidified. The existing optical mold is not provided with a demolding mechanism, and only a thimble is arranged in the movable mold plate. When the mold is opened, the ejector pin can jack up part of waste materials in the runner of the optical mold. The waste material in the runner can drive the plastic lens formed in the cavity to move in the direction away from the movable mold core. Therefore, the plastic lens formed in the cavity can be separated from the movable mold core.

However, since the waste material in the runner is only connected with a partial area of the molded plastic lens, when the ejector pin ejects the waste material in the runner and drives the plastic lens to move upwards, the molded plastic lens is stressed on one side, so that the plastic lens is easy to deform when being separated from the movable mold core.

Disclosure of Invention

The embodiment of the application provides an optical die and an injection molding machine, which solve the problem that a lens manufactured by the existing optical die is easy to deform in demolding.

In order to achieve the above purpose, the present application adopts the following technical scheme:

in a first aspect, an embodiment of the present application provides an optical mold including a stationary platen, a movable platen, a stationary mold core, a pushing member, and a movable mold core. When the optical mold is closed, the movable mold plate and the fixed mold plate are oppositely arranged along the first direction. The surface of one side of the movable template, which is close to the fixed template, can be provided with a mounting groove. The fixed die core is fixedly arranged in the fixed die plate, and the fixed die core can penetrate out of the fixed die plate and is arranged close to one side surface of the movable die plate. The pushing piece is movably arranged in the mounting groove of the movable template along the first direction and is opposite to the fixed die core and the partial area of the fixed die core. The movable mould core is arranged in the movable mould plate and the pushing piece and is opposite to the fixed mould core. The surface of the fixed die core, which is close to the movable die core, is provided with a first main body cavity surface. The first main body cavity surface is opposite to the fixed die core and the pushing piece. The first body cavity surface is for forming a first optical surface of the lens. An annular outer diameter cavity surface is formed on the fixed die core along the periphery of the first main body cavity surface. The annular outer diameter cavity surface is used to form the outer side surface of the lens. The surface of the movable die core opposite to the first main body cavity surface forms a second main body cavity surface. The second body cavity surface is for forming a central region of a second optical surface of the lens. One side surface of the pushing piece, which is close to the fixed die plate, is connected with the cavity surface of the second main body and the cavity surface of the annular outer diameter. And, a partial area surface of the pusher between the second body cavity surface and the annular outer diameter cavity surface is used to form an edge area of the second optical surface of the lens. The first main body cavity surface, the annular outer diameter cavity surface, the second main body cavity surface and a part of the area, which is close to one side surface of the fixed die plate, on the pushing piece enclose a cavity for forming a lens. Therefore, when the optical mold of the embodiment of the application is opened, the pushing member can drive the edge region of the lens in the cavity to move along the first direction in a direction away from the movable mold core, so that the lens is separated from the movable mold core. Since part of the cavity surface for forming the edge region of the second optical surface of the lens is provided on the pusher, the pusher can exert a force on the outer diameter of the lens for one revolution. When the lens is separated from the movable mold core, deformation is not easy to generate. And the annular outer diameter cavity surface is only arranged on the fixed die core, so that the outer diameter surface of the lens can be directly formed on the fixed die core. And the center of the lens is arranged between the fixed die core and the movable die core. Therefore, the installation error generated when the pushing piece and the movable mould plate are coaxially installed has little influence on the eccentricity of the lens.

It should be noted that the optical mold according to the embodiments of the present application may be a "one-mold multi-cavity" mold. Thus, in some possible embodiments of the present application, the "multi-cavity optical mold" includes a plurality of movable mold cores and a plurality of fixed mold cores, the plurality of movable mold cores being mounted on a pushing member at intervals. The fixed mold cores are arranged on the fixed mold plate at intervals, and the movable mold cores and the fixed mold cores are respectively and correspondingly arranged. For example, the number of the movable mold cores is the same as the number of the fixed mold cores. The movable mold cores and the fixed mold cores are arranged in one-to-one correspondence. The components in the optical mould described above are relatively simple.

In other possible embodiments of the present application, the optical mold of the "one-mold multi-cavity" includes a plurality of pushing members, a plurality of movable mold cores, and a plurality of fixed mold cores. A plurality of mounting grooves are formed in the surface of one side, close to the fixed die plate, of the movable die plate at intervals. The plurality of pushing pieces are respectively arranged in the plurality of mounting grooves on the movable template. The movable mold cores are respectively arranged in the pushing pieces, and at least one movable mold core is arranged on each pushing piece. The fixed mould cores are respectively arranged at positions on the fixed mould plate corresponding to the movable mould cores. Therefore, the plurality of fixed mold cores can be correspondingly arranged with the plurality of movable mold cores.

Based on the above, the pushing member in the embodiment of the present application may be a pushing plate, or may be a hollow pushing tube. The push plate and the hollow push tube are simple in structure and convenient to process and manufacture.

In some embodiments, a main runner is formed in the fixed die plate, and a sub runner communicated with the main runner is formed between the fixed die plate and the pushing piece. The shunt is also in communication with the cavity. The optical mold further comprises a first ejection member movably installed in the movable mold plate and the pushing member along the first direction. And, the first ejector member may be inserted into the sub-runner near the first end of the stationary platen. When the optical mold is opened, the first end of the first ejection member can eject the waste in the sub-runner. Because the sub-runner is communicated with the cavity, the waste materials in the sub-runner can drive the lens in the cavity to be separated from the movable mold core. Thus, the first ejector can assist in the demolding operation.

And a first tensioning structure is arranged at the first end of the first ejection piece, and the first tensioning structure can tension runner scraps in the sub-runners. Therefore, the problem of separation of the lens when the movable mold core is separated from the fixed mold core is avoided.

In some embodiments, the first tightening structure is a tightening hook disposed at a first end of the first ejector.

In some embodiments, the first tensioning structure is a frosted surface disposed on the first end surface of the first ejector member.

In some embodiments, the first tightening structure is a serrated surface provided on a first end surface of the first ejector.

In addition, in some embodiments of the present application, a flash well is formed between the fixed mold insert and the pushing member. The flash well is communicated with the cavity. And the optical mould also comprises a second ejection piece which is movably arranged in the movable mould plate and the pushing piece along the first direction. The second ejector member may be inserted into the flash well adjacent the first end of the stationary platen. When the optical mould is opened, the second ejection piece can eject the waste in the flash well. Because the flash well is communicated with the cavity, the waste in the flash well can drive the lens in the cavity to be separated from the movable mold insert, and the separation of the lens and the movable mold insert is facilitated.

Also, in some embodiments, the flash well is disposed opposite the flow channel in a radial direction of the cavity. Therefore, the first ejection piece and the second ejection piece are arranged oppositely, and force is applied to the two opposite sides of the lens by the first ejection piece and the second ejection piece when the optical mold is demolded, so that the stress of the lens is uniform, and the problem of deformation in the demolding process of the lens is reduced.

Similarly, the first end of the second ejector may be provided with a second tensioning structure. The second tensioning structure can tension the scraps in the flash well, so that the problem of separation type of the lens when the movable template is separated from the fixed template is further avoided.

Also, in some embodiments, the second tightening structure is a tightening hook disposed at the first end of the second ejector.

In some embodiments, the second tensioning structure is a frosted surface disposed on an end surface of the first end of the second ejector member.

In some embodiments, the second tightening structure is a serrated surface provided on an end surface of the first end of the second ejector.

In a second aspect, embodiments of the present application also include an injection molding machine that includes a body and the optical mold described in the previous embodiments. The optical mold is mounted on the body. Because the optical mold in the injection molding machine of the embodiment of the application has the same structure as the optical mold in the above embodiment, the two can solve the same technical problem and obtain the same technical effect, and the description is omitted here.

Drawings

In order to describe the technical solutions of the embodiments of the present application, the following description will describe the drawings that are required to be used in the embodiments of the present application.

FIG. 1 is a schematic perspective view of an optical mold according to an embodiment of the present application;

FIG. 2 is an exploded view of an optical mold according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of an optical mold according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a fixed mold and a movable mold separated in an optical mold according to an embodiment of the present application;

FIG. 5 is a schematic diagram showing the separation of a lens from a mold core in an optical mold according to a first related art;

FIG. 6 is a schematic view showing a partial structure of an optical mold according to a second related art;

FIG. 7 is a schematic diagram of a second related art optical mold and lens structure;

FIG. 8 is a schematic view showing a partial structure of an optical mold of a third related art;

FIG. 9 is a schematic view of a partial structure of an optical mold according to an embodiment of the present application;

FIG. 10 is a top view of a portion of an optical mold having a pusher member according to an embodiment of the present disclosure;

FIG. 11 is a perspective view of a portion of an optical mold having a pusher member according to an embodiment of the present application;

FIG. 12 is a top view of a portion of the structure of a pusher member having 4 pusher plate structures in an optical die according to an embodiment of the present application;

FIG. 13 is a partial structural perspective view of a pusher member having 4 pusher plate structures in an optical die according to an embodiment of the present application;

FIG. 14 is a top view of a portion of the structure of a pusher having 4 hollow push tube structures in an optical die according to an embodiment of the present application;

FIG. 15 is a partial perspective view of a pusher member having 4 hollow push tube structures in an optical die according to an embodiment of the present application;

fig. 16 is an enlarged view of a portion a of fig. 3;

FIG. 17 is a cross-sectional view of a portion of the structure of an optical mold according to an embodiment of the present application, wherein the first end of the first ejector and the first end of the second ejector are both serrated surfaces;

fig. 18 is a sectional view of a part of the structure of the optical mold according to the embodiment of the present application, in which the first end of the first ejector and the first end of the second ejector are both tensioning hooks.

Reference numerals:

1000-optical mold; 1-fixing the mold; 11-fixing a cover plate; 12-a fixed template; 13-a fixed mould core; 2-a movable mould; 21-a movable cover plate; 22-a movable cushion block; 23-moving templates; 231-mounting grooves; 24-moving the mold core; 25-demolding device; 251-first ejector; 2511—an upper end of the first ejector 251; 2510-a first tensioning arrangement; 250-liftout piece; 252-pusher; 253—a first drive assembly; 2531-ejecting the block; 2532-a first pusher plate; 2533-a guide post; 2534-a return spring; 254-a second pusher plate; 255-a second ejector; 2551—a first end of second ejector 255; 2550-a second tensioning arrangement; 2510a, 2550 a-frosting; 2510b, 2550 b-serrated surfaces; 2510c, 2550 c-tightening hooks; 100-cavity; 101-a body part; 1011-a first body cavity surface; 1012-a second body cavity surface; 1013-annular body cavity surface; 1013 a-upper surface partial region; 102-outer diameter; 1020 a-a first annular outer diameter cavity surface; 1020 b-a second annular outer diameter cavity surface; 1021-annular outer diameter cavity surface; 200-a main runner; 300-a sub-runner; 400-flash well; 2000-product; 201-a lens; 2011-edge area; 202-runner waste; 203-flash well waste.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.

Hereinafter, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

Furthermore, in this application, directional terms "upper", "lower", "left", "right", "horizontal", and "vertical" are defined with respect to the orientation in which the components are schematically disposed in the drawings, and it should be understood that these directional terms are relative terms, which are used for descriptive and clarity with respect thereto, and which may be correspondingly varied according to the variation in the orientation in which the components are disposed in the drawings. In this application, unless explicitly specified and limited otherwise, the term "coupled" is to be construed broadly, e.g., as "coupled" may refer to a mechanical, physical, or a combination of structures. For example, the two parts can be fixedly connected, detachably connected or integrated; can be directly connected or indirectly connected through an intermediate medium. The circuit structure is also understood to be in physical contact and electrical conduction with components, and also understood to be in a form of connection between different components in a circuit structure through a PCB copper foil or a lead and other physical circuits capable of transmitting electric signals.

Embodiments of the present application include an optical mold that is a cavity clamp for injection molding an optical product. Referring to fig. 1 and fig. 2, fig. 1 is a perspective view of an optical mold according to some embodiments of the present application, and fig. 2 is an exploded schematic view of the optical mold according to some embodiments of the present application. The optical mold 1000 may be mounted on a body of an injection molding machine and used to make lenses. The lens may be a lens in an image capturing module, or may be a lens for other purposes, which is not limited in this application.

Illustratively, the body of the injection molding machine includes a stationary platen and a movable platen. The optical mold 1000 of the embodiment of the application includes a fixed mold 1 and a movable mold 2, the fixed mold 1 can be mounted on a fixed mold plate of an injection molding machine, and the movable mold 2 can be mounted on a movable mold plate of the injection molding machine. When the optical mold 1000 performs injection molding, the movable mold plate of the injection molding machine can drive the movable mold 2 to contact with the fixed mold 1 and be closed. When the optical mold 1000 is opened, the movable mold plate of the injection molding machine can drive the movable mold 2 to be separated from the fixed mold 1.

In some embodiments, as shown in fig. 1, a stationary mold 1 is stacked above a movable mold 2. It is understood that the fixed mold 1 may be disposed below the movable mold 2, which is not limited in this application. For convenience of explanation, the following stationary mold 1 may be stacked above the movable mold 2.

In some embodiments of the present application, the fixed mold 1 may include a fixed cover plate 11, a fixed mold plate 12, and a fixed mold core 13 as shown in fig. 2. Wherein the fixed platen 11 is stacked under the fixed platen 12. The fixed platen 12 is provided with a first assembly hole which extends in the vertical direction and penetrates the entire fixed platen 12. As shown in fig. 3, the fixed mold core 13 is fixedly installed in the first assembly hole and fixedly connected with the fixed cover plate 11. For example, the stationary mold core 13 is fixed to the stationary cover plate 11 by bolts. Thus, the stationary platen 12 is fixedly connected with the stationary platen 11.

As shown in fig. 2 and 3, the movable mold 2 may include a movable cover 21, a movable cushion 22, a movable mold plate 23, a movable mold core 24, and a demolding device 25. Wherein, the movable cover plate 21, the movable cushion block 22 and the movable template 23 are sequentially stacked from bottom to top and fixedly connected. The movable mold plate 23 is provided with a second assembly hole, and the second assembly hole extends in the vertical direction and penetrates through the whole movable mold plate 23. The fixed mold core 13 is installed in the second assembly hole. When the optical mold 1000 performs injection molding, the fixed mold plate 12 and the movable mold plate 23 are relatively attached, and the fixed mold core 13 are relatively arranged.

Fig. 4 is a schematic diagram showing the structure of the optical mold 1000 in which the fixed mold 1 and the movable mold 2 are opened. A cavity 100 as shown in fig. 4 is formed between a fixed mold 1 and a movable mold 2 of the optical mold 1000 according to the embodiment of the present application. The mold cavity 100 is used to form an optical lens. In the following, as shown in fig. 4, an optical mold 1000 is taken as a multi-cavity optical mold (i.e., a plurality of cavities in the optical mold 1000), and the main runner 200 shown in fig. 4 may be formed in the fixed platen 11 and the fixed platen 12. Also, a plurality of flow dividing passages 300 as shown in fig. 4 may be formed on a contact area between the lower surface of the stationary platen 12 and the upper surface of the movable platen 23, and the plurality of flow dividing passages 300 communicate with the lower end of the main flow passage 200. In other words, the upper wall surfaces of the plurality of sub-runners 300 may be formed on the lower surface of the stationary platen 12, and the lower ends of the main runners 200 are connected to the upper wall surfaces of the plurality of sub-runners 300. The movable platen 23 may have a plurality of sub-runners 300 formed on an upper surface thereof, and the lower walls of the sub-runners 300 may be positioned opposite to the upper walls of the sub-runners 300. When the fixed platen 12 and the movable platen 23 are clamped, the fixed platen 12 and the movable platen 23 are bonded to each other. Meanwhile, the upper wall surfaces of the plurality of sub-runners 300 on the lower surface of the stationary platen 12 and the lower wall surfaces of the plurality of sub-runners 300 on the upper surface of the movable platen 23 enclose the plurality of sub-runners 300. Meanwhile, the upper wall surfaces of the plurality of cavities 100 and the lower wall surfaces of the plurality of cavities 100 enclose a plurality of cavities 100. The plurality of runners 300 communicate with the plurality of cavities 100 shown in fig. 4, respectively. For example, the plurality of runners 300 are in one-to-one correspondence with the plurality of cavities 100. Each of the runners 300 communicates with one of the cavities 100. In the optical mold 1000, the main runner 200, the plurality of sub-runners 300, and the plurality of cavities 100 are opened to obtain a product 2000 as shown in fig. 2. The product 2000 includes a plurality of lenses.

The above-described mold release device 25 includes a first ejector 251 as shown in fig. 3, the first ejector 251 being movably installed in the movable mold plate 23 in the vertical direction. The first ejector 251 may be a push rod or a push pin structure. Also, the upper end 2511 of the first ejector 251 may be inserted into the flow path 300. If the cavity 100 is formed in the region between the fixed mold core 13 and the movable mold core 24, the scrap in the split runner 300 (i.e., the runner scrap 202 shown in fig. 5) can be ejected only by the first ejector 251 when the optical mold 1000 is opened, as shown in fig. 5. Since the runner 300 is communicated with the cavity 100, the runner waste 202 can drive the lens 201 in the cavity 100 to be separated from the movable mold core 24. However, the connection of the flow channel waste 202 to only a partial region of the lens 201 can be considered a "single ended" connection. Therefore, in the demolding process, the single side of the lens 201 is stressed, so that deformation is easy to generate when the lens 201 is separated from the movable mold core 24.

Alternatively, as shown in fig. 6, if the demolding device 25 further includes a plurality of ejector members 250, the plurality of ejector members 250 are movably installed in the movable mold plate 23 in the vertical direction. The ejector 250 may be a thimble. When the optical mold 1000 is opened, the upper ends of the plurality of ejector members 250 may be inserted into the positions of the outer diameters of the lenses 201 in the cavity 100, respectively, and abut against different positions of the edge regions 2011 of the lenses 201 in the circumferential direction, respectively, as shown in fig. 7. Because the ejector 250 of the plurality of ejector pins has poor machining consistency, the plurality of ejector pins have uneven pushing force on the outer diameter of the lens 201 in a circle, so that the lens 201 is easy to deform in the demolding process.

Therefore, in order to solve the above-described problem, the upper surface of the movable die plate 23 of the embodiment of the present application is provided with the mounting groove 231 as shown in fig. 2. The above-described mold release device 25 further includes a pusher 252 as shown in fig. 3, the pusher 252 being movably installed in the vertical direction in the installation recess 231 of the movable mold plate 23. The pushing member 252 may be disposed opposite to a partial region of the stationary platen 12 and the stationary core 13. The pushing piece 252 can be a pushing plate or a hollow pushing tube, and has simple structure. The movable mold core 24 may be installed in the pushing member 252 in addition to the movable mold plate 23, so as to ensure that the movable mold core 24 is opposite to the fixed mold core 13. In other words, the lower surface of the fixed mold core 13 is opposite to a partial area of the upper surface of the pushing member 252, the upper surface of the movable mold core 24. I.e. the projection of the fixed mold core 13 on the movable mold plate 23 can cover the whole movable mold core 24. In addition, the pushing member 252 is movably connected with the movable mold core 24, so as to ensure that the pushing member 252 does not drive the movable mold core 24 to move.

Illustratively, the second mounting hole on the movable die plate 23 communicates with the mounting recess 231 described above. The pushing member 252 is a pushing plate as shown in fig. 2, and a third assembly hole corresponding to the second assembly hole is formed on the pushing plate, and the third assembly hole can penetrate through the thickness of the pushing plate. The movable mold core 24 is fixedly installed in the second assembly hole, and is in clearance fit in the third assembly hole. The push plate can move along the extending direction (i.e., the vertical direction) of the movable mold core 24. Therefore, the movable mould core 24 can be fixedly connected with the movable mould plate 23, and meanwhile, the movable mould core 24 cannot influence the movement of the push plate.

The demolding device 25 further comprises a first driving assembly 253 shown in fig. 3, and the first driving assembly 253 is in transmission connection with the pushing piece 252. The first driving assembly 253 may drive the pusher 252 to move in the vertical direction.

The cavity 100 is formed in the region between the fixed mold core 13 and the movable mold core 24 and the pushing member 252. As shown in fig. 8, for example, the cavity 100 includes a main body 101 and an outer diameter 102. The main body 101 includes a first main body cavity surface 1011, a second main body cavity surface 1012, and an annular main body cavity surface 1013. The first main body cavity surface 1011 is formed on the lower surface of the fixed mold core 13, and may be opposite to both the movable mold core 24 and the pushing member 252. The first body cavity surface 1011 may be adapted to the first optical surface of the lens 201. The adaptation means that the shape and size of the first body cavity surface 1011 are the same as the shape and size of the first optical surface of the lens 201. Therefore, the first body cavity surface 1011 may form a first optical surface of the lens 201. The first optical surface may be the light incident surface of the lens 201 or the light emergent surface of the lens 201, which is not limited in this application. And the second body cavity surface 1012 is formed on the upper surface of the movable die core 24 opposite to the central region of the first body cavity surface 1011. The annular body cavity surface 1013 is provided on the pusher 252 and opposes the edge region 2011 of the first body cavity surface 1011. The annular body cavity surface 1013 diffracts around the outer periphery of the second body cavity surface 1012. The second body cavity surface 1012 may be adapted to the central region of the second optical surface of the lens 201. The annular outer diameter cavity surface 1021 may be adapted to the edge region 2011 of the second optical surface of the lens 201. Therefore, when the fixed mold plate 12 and the movable mold plate 23 are clamped, the second body cavity surface 1012 forms a central region of the second optical surface of the lens 201. The annular body cavity surface 1013 forms an edge region 2011 of the second optical surface of the lens 201. Thus, the second body cavity surface 1012 and the annular body cavity surface 1013 may together form a second optical surface of the lens 201.

When the optical mold 1000 is opened, the first driving component 253 can push the pushing piece 252 to move upwards, and the pushing piece 252 can apply an upward moving force to the whole edge area 2011 of the second optical surface of the lens 201, so as to separate the lens 201 from the movable mold core 24. Compared to the optical mold shown in fig. 6 and 7, the pushing member 252 of the embodiment of the present application can apply a force to a circumference of the lens 201, so that the lens 201 is not easy to deform when separated from the movable mold core 24.

However, with continued reference to fig. 8, if the outer diameter portion 102 is formed between the fixed mold core 13 and the pusher 252, that is, the outer diameter portion 102 includes a first annular outer diameter cavity surface 1020a and a second annular outer diameter cavity surface 1020b. The first annular outer diameter cavity surface 1020a is formed on the fixed mold core 13 and diffracts on the outer periphery of the first main body cavity surface 1011. The second annular outer diameter cavity surface 1020b is formed on the pusher 252 and diffracts at the outer periphery of the annular body cavity surface 1013. The lower edge of the first annular outer diameter cavity surface 1020a may meet the upper edge of the second annular outer diameter cavity surface 1020b. Therefore, when the fixed die plate 12 and the movable die plate 23 are clamped, the first main body cavity surface 1011, the second main body cavity surface 1012, the annular main body cavity surface 1013, the first annular outer diameter cavity surface 1020a, and the second annular outer diameter cavity surface 1020b collectively define the cavity 100. The first annular outer diameter cavity surface 1020a corresponds to an upper portion of an outer side surface of the lens 201 (the outer side surface is a surface on which an outer diameter of the lens 201 is located), and the second annular outer diameter cavity surface 1020b corresponds to a lower portion of the outer side surface of the lens 201. The first and second annular outer diameter cavity surfaces 1020a, 1020b may collectively form an outer side surface of the lens 201. Since an installation error occurs when the pusher 252 is coaxially installed with the movable die plate 23, the lens 201 formed between the pusher 252 and the movable die plate 23 has a problem of large eccentricity. Decentration refers to the relative position of the center of the lens to the center of fit of the outer diameter of the lens.

Therefore, in the embodiment of the present application, as shown in fig. 9, the outer diameter portion 102 includes only one annular outer diameter cavity surface 1021. The annular outer diameter cavity surface 1021 is formed on the fixed mold insert 13 and diffracts on the outer periphery of the first main body cavity surface 1011. The upper surface portion 1013a of the pusher 252 is directly contiguous with the annular outside diameter cavity surface 1021 and the first body cavity surface 1011 such that the first body cavity surface 1011, the second body cavity surface 1012, the upper surface portion 1013a of the pusher 252, and the annular outside diameter cavity surface 1021 together define the cavity 100. The upper surface portion 1013a of the pusher 252 may be adapted to the edge area 2011 of the second optical surface of the lens 201. Therefore, the upper surface portion 1013a of the pusher 252 can form an edge region 2011 of the second optical surface of the lens 201.

Since the annular outer diameter cavity surface 1021 for forming the outer side surface of the lens 201 is directly provided on the fixed mold core 13, and the center of the lens 201 is provided between the fixed mold core 13 and the movable mold core 24. Therefore, the mounting error generated when the pusher 252 is mounted coaxially with the movable die plate 23 has little influence on the decentration of the lens 201. Further, experiments prove that the torsion of the lens 201 manufactured by the optical mold 1000 according to the embodiment of the present application may be less than 0.15 μm, and the eccentricity may be less than 1 μm.

It should be noted that, for the optical mold of "one-mold multi-cavity", the number of the movable mold cores 24 and the number of the fixed mold cores 13 in the optical mold 1000 are plural. While the number of pushing members 252 in optical mold 1000 may be one or more, the present application is not limited thereto.

In some embodiments of the present application, as shown in fig. 10 and 11, pusher 252 in optical mold 1000 is one. The number of the fixed mold cores 13 and the number of the movable mold cores 24 in the optical mold 1000 are 4, and the 4 fixed mold cores 13 are uniformly distributed on the fixed mold plate 12 at intervals. The outer circumference of the pushing piece 252 is located outside the projection of the 4 fixed mold cores 13 on the movable mold plate 23. The pushing piece 252 is provided with 4 third assembly holes corresponding to the positions of the 4 fixed die cores 13, and the movable die plate 23 is provided with 4 second assembly holes corresponding to the 4 second assembly holes. The 4 movable mold cores 24 are arranged in the 4 second assembly holes and the 4 third assembly holes in a one-to-one correspondence manner. The optical mold 1000 has only one pusher 252, which can reduce the assembly steps.

In other embodiments of the present application, as shown in fig. 12 and 13, the number of pushing members 252, the moving mold core 24, and the fixed mold core 13 in the optical mold 1000 is 4. Wherein, 4 fixed mould inserts 13 are distributed on the fixed mould plate 12 at intervals. The movable mold plate 23 is provided with 4 mounting grooves 231,4 corresponding to the positions of the 4 fixed mold cores 13, and the pushing pieces 252 are correspondingly arranged in the 4 mounting grooves 231 one by one. The 4 pushing members 252 may have a push plate structure as shown in fig. 13, or may have a hollow push tube structure as shown in fig. 14 and 15. Each pushing member 252 is provided with a third assembly hole. If the pushing member 252 is a hollow pushing tube, the wall surface of the third assembly hole is the inner wall of the hollow pushing tube. The movable mold plate 23 is provided with 4 second assembly holes corresponding to the positions of the third assembly holes on the 4 pushing pieces 252. The 4 movable mold cores 24 are arranged in the 4 second assembly holes and the 4 third assembly holes in a one-to-one correspondence manner, so that the 4 movable mold cores 24 are in one-to-one correspondence with the 4 fixed mold cores 12.

The configuration of the first driving assembly 253 required is also different for the optical mold 1000 having different distribution schemes of the pushing member 252, the movable mold core 24 and the fixed mold core 13. Taking 1 pushing member 252 and 4 moving mold cores 24 and 13 in the optical mold 1000 as an example, referring back to fig. 3, the first driving assembly 253 includes an ejection block 2531, a pushing member plate 2532, a guide pillar 2533 and a return spring 2534. Wherein, the ejection block 2531 is in transmission connection with the ejector rod of the injection molding machine. The pushing plate 2532 is installed in the movable cushion block 22 and is in transmission connection with the upper end of the ejection block 2531. The guide posts 2533 are movably installed on the movable block 22 and the movable die plate 23 in the vertical direction. And, both ends of the guide pillar 2533 are fixedly connected with the pusher plate 2532 and the pusher 252, respectively. The return spring 2534 is sleeved outside the guide post 2533 and connected with the movable cushion block 22. When the optical mold 1000 is demolded, the ejector rod of the injection molding machine drives the ejector block 2531 to move upwards, the ejector block 2531 can push the first ejector plate 2532, the guide post 2533 and the pushing piece 252 to move upwards together, and the pushing piece 252 pushes the whole peripheral area of the second optical surface of the lens 201, so that the central area of the second optical surface of the lens 201 is separated from the movable mold core 24. At the same time, return spring 2534 is compressed or stretched. After demolding, the first pusher plate 2532, the guide post 2533, the pusher 252 and the ejector block 2531 are driven to move downward until returning to the initial position under the action of the restoring force of the restoring spring 2534.

Based on the structure of the first driving assembly 253, the demolding device 25 further includes a second pusher plate 254 as shown in fig. 3, and the second pusher plate 254 is stacked on the first pusher plate 2532. The lower end of the first ejector 251 is mounted in the movable block 22 and is in driving connection with the second ejector plate 254. When the ejector 2531 pushes the second ejector plate 254, the second ejector plate 254 drives the first ejector 251 to move upwards, the first ejector 251 ejects the runner waste 202 in the runner 300, and the runner waste 20 can drive the lens 201 to be separated from the movable mold core 24.

It should be noted that, in some embodiments of the present application, a limiting structure, such as a limiting block, is disposed in the movable cushion block 22. The first pushing plate 2532 can abut against the limiting block when moving upwards to a preset position. The upper end of the ejector 2531 may be directly in driving connection with the second ejector plate 254. Therefore, when the optical mold 1000 is released, the movable mold 2 is separated from the fixed mold 1. Thereafter, the ejector pin of the injection molding machine drives the ejector block 2531 to move upwards, and the ejector block 2531 can push the first ejector plate 2532, the guide post 2533 and the ejector 252 to move upwards together, and push the second ejector plate 254 and the first ejector 251 to move upwards, so that the ejector 252 can push the lens 201 to be separated from the movable mold core 24 from the edge area 2011 for one circle, and meanwhile, the first ejector 251 ejects the waste in the shunt 300. When the first pushing plate 2532 reaches the preset position, the first pushing plate 2532 abuts against the limiting block. The ejector 2531 can continuously push the second ejector plate 254 and the first ejector 251 to move upwards, and the first ejector 251 ejects the runner waste 202 in the runner 300 and drives the lens 201 to be separated from the movable mold core 24.

However, when the movable mold 2 is separated from the fixed mold 1, a problem of reverse release is liable to occur. The reverse release refers to a phenomenon in which the lens 201 is pulled to the side of the fixed mold 1 when the fixed mold 1 is separated from the movable mold 2 in the optical mold 1000. Since the mold releasing device is not provided on the fixed mold 1, the lens 201 is not easily separated from the fixed mold 1 after the lens 201 is pulled to one side of the fixed mold 1.

To solve this problem, in the embodiment of the present application, the first end 2551 of the first ejector 251 is provided with a first tightening structure 2510 as shown in fig. 16, and the first tightening structure 2510 can pull the runner scrap 202 in the runner 300 to avoid pulling the lens 201 to the side of the fixed mold 1 after mold opening.

The first tension structure 2510 in the present embodiment may take various structural forms. For example, as shown in fig. 16, the first tensioning structure 2510 is a frosted surface 2510a formed on the end surface of the first end 2551 of the first ejector member 251. As another example, as shown in fig. 17, the first tightening structure 2510 is a serrated surface 2510b formed on the end surface of the first end 2551 of the first ejector 251. As another example, as shown in fig. 18, the first tightening structure 2510 is a tightening hook 2510c formed on the first end 2511 of the first ejector 251.

However, considering that the first tightening structure 2510 can be tightened only from one circumferential side of the lens 201, other regions of the lens 201 may be pulled up by the fixed mold 1 to be tilted or deformed. Thus, in some embodiments of the present application, a flash well 400 as shown in fig. 16 is formed between the stationary mold core 13 and the pushing member 252. And, the flash well 400 communicates with the cavity 100, and the excessive material flowing into the cavity 100 may enter the flash well 400. Note that, when the size of the fixed mold core 12 in the horizontal direction in fig. 16 is small, the flash well 400 is formed between the fixed mold core 13 and the pushing member 252 and the fixed mold plate 12.

The above-described mold release device 25 further includes a second ejector 255 as shown in fig. 16, the second ejector 255 being movably installed in the vertical direction in the movable mold plate 23 and the pusher 252. Also, a first end 2551 (i.e., an upper end) of the second ejection member 255 may be inserted into the flash well 400. Specifically, the second ejector 255 may also be a thimble or ejector structure.

It should be noted that, referring back to fig. 3, the second end (i.e., the lower end) of the second ejector 255 may be installed in the movable block 22 and be in driving connection with the second ejector plate 254. When the ejector block 2531 pushes the second ejector plate 254, the first ejector 251 and the second ejector 255 may be simultaneously driven to move upward. The first ejection member 251 ejects the runner waste 202 in the runner 300 and drives the lens 201 to be separated from the movable mold core 24, and the second ejection member 255 ejects the lens through the burr hole waste 203 in the burr hole 400 and drives the lens to be separated from the movable mold core 24. Also, the burr hole 400 and the shunt 300 may be symmetrically disposed along the center of the cavity 100. The flash well 400 and the shunt 300 apply upward forces to the lens 201 from both sides, respectively, and the lens 201 is not easily deformed.

Also, in some embodiments of the present application, the first end 2551 of the second ejector 255 may also be provided with a second tensioning structure 2550 as shown in fig. 16. The second tensioning mechanism 2550 can pull the burr hole waste 203 in the burr hole 400 to avoid pulling the lens 201 to the side of the stationary mold 1 after mold opening. The first tensioning structure 2510 and the second tensioning structure 2550 can apply force from both sides of the lens 201, further avoiding the problem of separation of the lens 201.

As shown in fig. 16, the second tightening structure 2550 may be a frosted surface 2550a formed on an end surface of the first end 2551 of the second ejector 255. As shown in fig. 17, the second tightening structure 2550 may be a serrated surface 2550b formed on an end surface of the first end 2551 of the second ejector 255. Alternatively, as shown in fig. 18, the second tightening structure 2550 may be a tightening hook 2550c formed on the first end 2551 of the second ejector 255. Also, the first tensioning structure 2510 and the second tensioning structure 2550 may have the same structure or may have different structures, which is not limited in this application.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (11)

1. An optical mold, comprising:

a stationary mold plate;

the movable template and the fixed template are oppositely arranged along a first direction; a mounting groove is formed in the surface of one side, close to the fixed template, of the movable template;

the fixed die core is fixedly arranged in the fixed die plate and penetrates out of the fixed die plate to be arranged close to one side surface of the movable die plate;

the pushing piece is movably arranged in the mounting groove of the movable template along the first direction and is opposite to the fixed template and the partial area of the fixed mould core;

the movable die core is arranged in the movable die plate and the pushing piece and is opposite to the fixed die core;

a first main body cavity surface is formed on the surface of the fixed die core, which is close to the movable die core, and is opposite to the fixed die core and the pushing piece and used for forming a first optical surface of the lens; an annular outer diameter cavity surface is formed on the fixed die core along the periphery of the first main body cavity surface, and the annular outer diameter cavity surface is used for forming the outer side surface of the lens; a second main body cavity surface is formed on the surface, opposite to the first main body cavity surface, of the movable mold core; the second body cavity surface is used for forming a central area of a second optical surface of the lens; a part of area, close to one side surface of the fixed die plate, of the pushing piece is connected with the second main body cavity surface and the annular outer diameter cavity surface, and is used for forming an edge area of a second optical surface of the lens; the first main body cavity surface, the annular outer diameter cavity surface, the second main body cavity surface and a part of the area, which is close to one side surface of the fixed die plate, on the pushing piece enclose a cavity for forming a lens.

2. The optical mold of claim 1, wherein the optical mold comprises a plurality of the movable mold cores and a plurality of the fixed mold cores, the plurality of movable mold cores being mounted on the pushing member at intervals; the fixed mould cores are respectively arranged at the positions on the fixed mould plate, which are opposite to the movable mould cores.

3. The optical mold according to claim 1, wherein a plurality of the mounting grooves are provided on a side surface of the movable platen adjacent to the stationary platen at intervals; the optical die comprises a plurality of pushing pieces, a plurality of movable die cores and a plurality of fixed die cores, and the pushing pieces are respectively arranged in a plurality of mounting grooves on the movable die plate; the movable mold cores are respectively arranged in the pushing pieces, and at least one movable mold core is arranged in each pushing piece; the fixed mould cores are respectively arranged on the fixed mould plate at positions corresponding to the movable mould cores.

4. An optical mould according to any one of claims 1 to 3, wherein the pushing member is a push plate or a hollow push tube.

5. The optical mold according to any one of claims 1 to 4, wherein a split flow passage is formed between the stationary platen and the pushing member, the split flow passage being in communication with the cavity;

the optical die further comprises a first ejection member which is movably arranged in the movable die plate and the pushing member along the first direction, and the first ejection member is inserted into the flow dividing channel close to the first end of the fixed die plate.

6. The optical mold of claim 5, wherein the first end of the first ejector is provided with a first tensioning structure for tensioning runner scrap in the shunt.

7. The optical mold of claim 6, wherein the first tensioning structure is a tensioning hook provided on the first end of the first ejector, a frosted surface provided on the first end face of the first ejector, or a serrated surface provided on the first end face of the first ejector.

8. The optical mold according to any one of claims 1 to 7, wherein a flash well is formed between the fixed mold core and the pushing member, the flash well being in communication with the cavity;

the optical die further comprises a second ejection piece, the second ejection piece is movably arranged in the movable die plate and the pushing piece along the first direction, and the second ejection piece is inserted into the flash well close to the first end of the fixed die plate.

9. The optical mold of claim 8, wherein the first end of the second ejector is provided with a second tensioning structure for tensioning the slug within the flash well.

10. The optical mold of claim 9, wherein the second tensioning structure is a tensioning hook provided on the first end of the second ejector, a frosted surface provided on the first end face of the second ejector, or a serrated surface provided on the first end face of the second ejector.

11. An injection molding machine comprising a machine body, and an optical mold according to any one of claims 1 to 10, said optical mold being mounted on said machine body.