CN212666606U - Precise mold for demolding of fixed mold side and optical lens - Google Patents

Abstract

The utility model discloses a precise mould for demoulding of a fixed mould side, which comprises a fixed mould and a movable mould, wherein the fixed mould comprises at least two front mould inserts, and a demoulding mechanism is arranged on the fixed mould; the edge of the mirror surface area of the front mold core is provided with at least two arc channel-shaped structures which are distributed annularly and have arc slope-shaped transition at two ends, a vacancy avoidance position is arranged between the arc channel-shaped structures, and an ejection pin hole is arranged on the vacancy avoidance position; the demolding mechanism comprises at least two ejector pins and an ejector device arranged on one side of each ejector pin, and the ejector device is used for driving the ejector pins to telescopically slide along the ejector pin holes; the utility model also provides an accurate optical lens piece that is used for the drawing of patterns of cover half side, the utility model discloses send demoulding mechanism package on the cover half, solve the deformation problem of ultra-thin, the thickness ratio disparity that is located the cover half side, the optical lens piece that the edge bending is severe when the shaping drawing of patterns effectively, guarantee the high accuracy production of product.

Description

Precise mold for demolding of fixed mold side and optical lens

Technical Field

The utility model relates to a field of moulding plastics is made to optical lens's mould, especially relates to an accurate mould and optical lens who is used for cover half side drawing of patterns.

Background

With the continuous improvement and the continuous reduction of the size of the pixels of the mobile phone camera, the requirement on the precision of the die is higher and higher. The existing mold for the mobile phone camera lens is generally processed by adopting an ultra-precision processing technology, for example, a nanoscale single-point diamond ultra-precision processing machine tool is used for processing a lens mold core, an ultra-precision coordinate grinding machine is used for processing a through hole of a thimble pin, and all ultra-precision processing equipment is used to ensure that the precision of the mold is controlled at a micro-nano level. The injection molding precision of the mobile phone camera lens is greatly improved.

The existing mold technology basically adopts a mode of side ejection of a movable mold (a rear mold), namely, a front mold is not moved, and a rear mold ejects a cured optical lens and a runner by using an ejection pin in a mold splitting process. Although the ultra-precision machining process of the mold and the modern fully-electronic-controlled precision injection molding process can ensure the product quality and yield of most mobile phone camera lenses, for some special lenses, such as ultra-thin lenses, the thickness is within 0.23mm, and lenses with different thicknesses, such as lenses with very thick center positions and very thin edge positions, or lenses with very thin center positions and very thick edge positions, and the thickness ratio is more than 3 times of lenses; some aspheric lenses have sharp, relatively sharp edges. For these types of lenses, after injection molding and pressure maintaining, in the demolding and releasing process, due to the fact that the curved surface is deep and the slope is steep, the surface bonding force of the mold core is large, the surface shape of the lens is often distorted and deformed when the fixed mold side (front mold) and the movable mold side (rear mold) are separated and demolded, the curved surfaces on the two sides of the lens generate the problem of yas (AS, and the surface shape errors in the X and Y directions are not consistent), so that serious surface shape errors are caused, double images or blurring of the images are directly caused, and the resolving power of optical imaging is reduced.

Wherein taiwan burt photoelectricity proposes an optical lens and a mold for manufacturing the same in patent CN201520892820.6, the mold for manufacturing is provided with a base, a lower mold, an upper mold and an ejection head, the base is provided with at least three ejection pins, the lower mold is provided with a lower mold and a lower mold core, the lower mold core is provided with a lower mold cavity and at least three through holes, each ejection pin extends into the lower mold cavity through the through hole, the upper mold is provided with an upper mold and an upper mold core with the upper mold cavity, a mold cavity is formed between the two mold cavities when the two mold cavities are attached, liquid plastic forms an optical lens in the mold cavity, each ejection pin simultaneously abuts against the bottom surface of the optical lens to enable the optical lens to be uniformly stressed to be separated from the lower mold cavity, and an optical lens and a mold for manufacturing the same are provided, which apply a uniform force, are not.

Although the above-mentioned technology solves the problem of uniform stress when the optical lens is demolded and molded, for some lenses that are ultra-thin, have a very different thickness ratio, or have a severely curved edge, the technology still cannot determine the distortion deformation generated when the mold side (front mold) is opened and separated, so that a serious asian problem (AS, i.e., an asymmetric surface type error in the X and Y directions) is easily generated, resulting in unclear imaging or ghost images. Meanwhile, the ejection pins can generate more or less burrs or batch peaks, generally the minimum is a few tenths of micrometers, the maximum can reach twenty-thirty micrometers, for a mobile phone camera with extremely high precision requirement, as long as the burrs or batch peaks with the size of a few tenths of micrometers exist, the assembly parallelism and the air gap between the lens assembly bearing surface and other lenses can be directly influenced, and the influence factor belongs to a great abnormal problem in the field of high-precision optics.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the above-mentioned defect among the prior art, provide a drawing of patterns atress even, drawing of patterns precision is high, can effectively eliminate the ya si problem of lens, can guarantee the assembly precision between each lens, can solve the precision problem's of the optical lens shaping drawing of patterns of ultra-thin and thickness ratio disparity precision be used for the mould side drawing of patterns mould, still provide one kind can adapt to ultra-thin, and thickness ratio disparity, the optical lens who is used for the mould side drawing of patterns of the sharp high precision lens drawing of patterns of edge bending.

In order to achieve the purpose, the utility model provides a precise die for demoulding the fixed die at the side, which comprises a fixed die and a movable die, wherein the fixed die comprises at least two front die inserts, and a demoulding mechanism is arranged on the fixed die; the edge of the mirror surface area of the front mold core is provided with at least two arc channel-shaped structures which are distributed annularly and have arc slope-shaped transition at two ends, a vacancy avoidance position is arranged between the arc channel-shaped structures, and an ejection pin hole is arranged on the vacancy avoidance position; the demolding mechanism comprises at least two ejector pins and an ejector device arranged on one side of each ejector pin, and the ejector device is used for driving the ejector pins to slide along the ejector pin holes in a telescopic mode.

Preferably, the ejection device comprises an upper fixed plate arranged on the fixed die, a lower fixed plate fixedly connected with one side of the upper fixed plate, a compression spring arranged on one side of the upper fixed plate, and return guide posts arranged around the upper fixed plate; the ejector pin is arranged on the lower fixing plate.

Preferably, the distance between the lower fixing plate and the lower fixing plate of the front mold is 0.2mm-50 mm.

Preferably, the ejection device is a spring device, a magnet device, a pneumatic device, an elastic glue device or a hydraulic pushing device.

Preferably, the fixed die is provided with eight front die cores.

Preferably, the number of the arc channel-shaped structures is three, and the arc channel-shaped structures are annularly arranged on the edge of the mirror surface area on the front mold core at 120 degrees.

Preferably, the surface of the vacancy avoidance position is a plane or an arc-shaped curved surface.

Preferably, the cross-sectional profile of the vacancy-avoiding position is a wave shape with slope-shaped and arc-shaped transitions on two sides or a plurality of arc-shaped sections.

Preferably, the surface of the vacancy avoiding position is higher than the arc channel-shaped structure, and the surface of the vacancy avoiding position is flush with or close to the flange plane at the edge of the front mold core.

Preferably, the cross-sectional shape of the ejector pin is a circle, a square, a triangle, a polygon, a circular ring, or an asymmetric shape.

Preferably, the fixed die comprises a front die upper fixing plate, a front die lower fixing plate arranged on one side of the front die upper fixing plate, and an upper die plate arranged on one side of the front die lower fixing plate;

the upper fixing plate, the lower fixing plate and the compression spring are respectively arranged between the front die upper fixing plate and the front die lower fixing plate, the compression spring is in contact with the front die upper fixing plate, and the front die core is arranged on the upper die plate.

Preferably, the fixed die further comprises an insert fixing screw arranged on the upper fixing plate of the front die, and the insert fixing screw penetrates through the upper fixing plate, the lower fixing plate and the lower fixing plate of the front die to be fixedly connected with the front die core.

Preferably, the fixed die further comprises guide rod fixing bolts arranged on the periphery of the upper die plate, a sprue bush arranged in the middle of the lower fixing plate of the front die, and a runner communicated with the sprue bush, the front die core is provided with a rubber inlet, and the rubber inlet is communicated with the runner.

Preferably, the movable mould includes the back mould fixed plate, installs the mould foot in back mould fixed plate both sides, installs the layer board of mould foot one side, installs the lower bolster in layer board one side, installs two at least back benevolence on the lower bolster, the quantity of back benevolence is the same with the front mould benevolence, the position and the front mould benevolence of back benevolence suit.

Preferably, the movable mold further comprises a movable mold side guide rod arranged on the mold foot or the supporting plate, and a water gap thimble arranged between the rear mold fixing plate and the supporting plate, wherein one end of the water gap thimble penetrates through the supporting plate and the lower mold plate successively.

Compared with the prior art, the utility model provides a pair of accurate mould that is used for cover half side drawing of patterns's beneficial effect lies in:

the demolding mechanism is arranged on the fixed mold, so that the deformation problem of the ultrathin optical lens with great thickness ratio and severe edge bending at the fixed mold side during molding and demolding can be effectively solved, and the high-precision production of products is ensured;

the fixed die comprises a front die core, at least two arc channel-shaped structures which are distributed annularly and have arc slope-shaped transition at two ends are arranged on the edge of a mirror surface area of the front die core, an avoidance space is arranged between the arc channel-shaped structures, the arc channel-shaped structures enable an assembling bearing surface of the optical lens to have very high precision after demolding, the assembling precision among the lenses is ensured, the avoidance space can prevent burrs of an ejection pin of the optical lens from being higher than the assembling bearing surface of the lens during demolding, the assembling parallelism and air gaps between the optical lens and other components are effectively prevented from being influenced, and the product yield is improved;

in addition, the demolding mechanism comprises at least two ejector pins and an ejector device arranged on one side of each ejector pin, the ejector device is used for driving the ejector pins to slide in a telescopic mode along ejector pin holes in the front mold core, and then the ejector pins are used for ejecting and demolding products, the arrangement of the two ejector pins can ensure that the stress of the optical lens is more uniform in the demolding process, the optical lens has very high surface accuracy after demolding, and the problem of Asia-Si caused by steep surface type of the optical lens is solved.

The utility model also provides an accurate optical lens piece that is used for drawing of patterns of deciding mould side, including the surface for the glossy mirror surface region of nanometer precision, set up the flange disc at the regional outside round of mirror surface, the both ends head that is provided with cyclic annular distribution on the flange disc has two at least boss structure of circular arc slope shape transition, is provided with between per two boss structure and has the gluey position of subtracting of circular arc slope transition, boss structure's shape characteristic is opposite with the shape of the arc channel shape structure of front mould benevolence, and position and quantity are corresponding, the shape characteristic of subtracting gluey position is opposite with the empty position shape of keeping away of front mould benevolence, and position and quantity are corresponding.

Preferably, the glue reducing position is lower than the upper surface of the boss structure, the glue reducing position is close to or flush with the plane of the flange disc, and the glue reducing position can be in contact with the ejection pin.

Preferably, the boss structure is between 10 and 500 microns above the flange disc.

Compared with the prior art, the utility model provides a pair of accurate optical lens piece product that is used for fixed mould side drawing of patterns's beneficial effect lies in:

the optical lens can adapt to ultrathin high-precision lens demoulding with great thickness ratio and severe edge bending.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a front view of a first embodiment of the present invention;

fig. 2 is a top view of a first embodiment of the present invention;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken at B-B of FIG. 2;

FIG. 5 is a cross-sectional view at C-O-C in FIG. 2;

FIG. 6 is an enlarged partial view of view E of FIG. 5;

FIG. 7 is a schematic view of the mold shown in FIG. 6 with the front and rear mold cores removed;

fig. 8 is a schematic structural view of a front mold insert according to a first embodiment of the present invention;

fig. 9 is a bottom view of the front mold insert according to the first embodiment of the present invention;

fig. 10 is an exploded view of a first embodiment of the present invention;

fig. 11 is a front view of a second embodiment of the present invention;

fig. 12 is a top view of a second embodiment of the present invention;

fig. 13 is a schematic structural diagram of a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example one

The existing mold technology adopts a movable mold side (rear mold) ejection mode, namely, a front mold is not moved, and a movable mold pushes an ejection pin and a lower fixed plate to eject cooled and solidified optical lenses and a flow channel by the ejection pin during mold separation of the movable mold and the movable mold, wherein an ejection scheme of a fixed mold side is not provided at present. The first embodiment provides a die which is ejected and demoulded from the first fixed die side in the industry.

The traditional scheme of side ejection of the movable mold has an unsolvable technical bottleneck, for some aspheric lenses, the edge part of a curved surface positioned on the fixed mold side is bent very sharply and steeply, and the bonding force between the lenses and the surface of a mold core on the fixed mold side is relatively large due to the fact that the curved surface on the fixed mold side is relatively deep and the gradient is relatively steep in the demolding and releasing processes after injection molding, the surface shape of the lenses is often distorted and deformed when the fixed mold side (front mold) and the movable mold side (rear mold) are separated and demolded, the curved surfaces on two sides of the lenses generate Asia (AS and the surface shape errors in the X direction and the Y direction are inconsistent), so that serious surface shape errors are caused, imaging ghost images or blurring are directly caused, and the image resolving power of optical imaging is reduced. In addition, some ultrathin lenses are provided, the thickness is within 0.23 mm; or the thickness is very different, the thickness is more than 3 times of the lens, for example, the center position of the lens is very thick, and the edge position of the lens is very thin, or the center position of the lens is very thin and the edge position is very thick, because of the uneven internal stress, the lens is easy to warp and deform when being ejected and demoulded. Aiming at the problems, the embodiment provides the mold for ejecting and demolding the first fixed mold side in the industry, so that the optical lens after injection molding can be ejected out under balanced stress at the fixed mold side, and the chances of yas and deformation are reduced to a great extent.

As shown in fig. 1-10, the present embodiment provides a precise mold for demolding a fixed mold side, which includes a fixed mold (or called front mold) 1 and a movable mold (or called rear mold) 2, where the fixed mold (or called front mold) 1 includes at least one front mold core 1110, and the fixed mold (or called front mold) 1 is provided with a demolding mechanism 3; the edge of the mirror surface area of the front mold core 1110 is provided with at least two arc channel-shaped structures 1112 which are distributed annularly and have arc slope-shaped transition at two ends, a vacancy avoidance position 1115 is arranged between the arc channel-shaped structures 1112, and the vacancy avoidance position 1115 is provided with an ejection pin hole 1113; the demolding mechanism 3 includes at least two ejector pins 1060, and an ejector device installed on one side of the ejector pins 1060, where the ejector device is used to drive the ejector pins 1060 to slide telescopically along the ejector pin holes 1113.

Specifically, the demolding mechanism 3 is arranged on the fixed mold 1, so that the deformation problem of the ultrathin optical lens with great thickness ratio and severe edge bending at the fixed mold side during molding and demolding can be effectively solved, and the high-precision production of the product is ensured; the arc channel-shaped structure 1112 ensures that the assembly bearing surface of the optical lens has very high precision after demoulding, ensures the assembly precision among the lenses, and the clearance 1115 can prevent the burrs of the ejection pin 1060 of the optical lens from being higher than the assembly bearing surface of the lens during demoulding, effectively avoids influencing the assembly parallelism and air gaps between the optical lens and other components, and improves the product yield; the ejection device is used for driving the ejection pin 1060 to make telescopic sliding along the ejection pin hole 1113 on the front mold core 1110, so that the ejection pin 1060 can eject and demold a product, the arrangement of the two or more ejection pins 1060 can ensure that the stress of the optical lens is more uniform in the demolding process, the surface accuracy is very high after demolding, and the problem of Asia-Si caused by the steep surface of the lens is solved.

Furthermore, three arc channel-shaped structures 1112 with two annularly distributed ends provided with arc slope-shaped transition are arranged on the edge of the mirror surface area of the front mold core 1110 and annularly arranged at the edge of the mirror surface area of the front mold core 1110 according to 120 degrees, each two arc channel-shaped structures 1112 are provided with a clearance position 1115, so that the front mold core 1110 is provided with three clearance positions 1115, each clearance position 1115 is provided with an ejection pin hole 1113, and the ejection pin holes 1113 are respectively arranged according to 120 degrees; three ejector pins 1060 are inserted through the three ejector pin holes 1113, respectively, and the upper end of each ejector pin 1060 is thicker and the lower end thereof is thinner, and the thinner end thereof is in contact with the flange edge of the optical lens. The concave part in the center of the lower surface of the front mold core 1110 is a mold cavity 1111, which is a nano-scale optical surface ultra-precisely processed by using single-point diamond. The movable mold 2 includes a rear mold core 1150, the rear mold core 1150 faces the front mold core 1110, the rear mold core 1150 is not provided with an ejection pin hole 1113, and the ejection of the lens is performed by an ejection pin 1060 on the fixed mold side. The optical lens 1130 is molded in a cavity between the front core 1110 and the rear core 1150. The surface types of the upper and lower surfaces of the optical lens are completely the same as the surfaces of the mold cavities of the front and rear mold cores.

Furthermore, the surface of the clearance 1115 is a plane or an arc curved surface; the cross-sectional profile of the clearance 1115 is in a wave shape with slope-shaped and arc-shaped transition at two sides or a plurality of arc-shaped sections; the surface of the clearance 1115 is higher than the arc channel-shaped structure 1112, and the surface of the clearance 1115 is flush with or close to the flange plane at the edge of the front mold core 1110; the sectional shape of the ejector pin 1060 may be circular, square, triangular, polygonal, circular, or asymmetric.

The ejector includes an upper fixing plate 1040 disposed on the stationary mold 1, a lower fixing plate 1070 fixedly connected to the upper fixing plate 1040, a compression spring 1030 disposed at one side of the upper fixing plate 1040, and a withdrawing guide 1050 disposed around the upper fixing plate 1040, wherein an ejector pin 1060 is mounted on the lower fixing plate 1070. Specifically, 4 compression springs 1030 are disposed in the counter bore below the front mold upper fixing plate 1020, and when demolding is performed, the compression springs 1030 push the upper fixing plate 1040 toward the lower fixing plate 1070 under the action of the elastic force of the compression springs 1030, so as to push the ejector pins 1060 to eject the optical lens 1130 smoothly. Further, a distance between the lower fixing plate 1070 and the front mold lower fixing plate 1090 is 0.2mm to 50mm, which is a stroke of the ejector pin 1060.

Of course, the ejection device may also be a spring device, a magnet device, a pneumatic device, an elastic glue device, or a hydraulic pushing device.

The fixed die 1 comprises a front die upper fixing plate 1020, a front die lower fixing plate 1090 arranged on one side of the front die upper fixing plate 1020, an upper die plate 1120 arranged on one side of the front die lower fixing plate 1090, insert fixing screws 1010 arranged on the front die upper fixing plate 1020, guide rod fixing bolts 1100 arranged on the periphery of the upper die plate 1120, a sprue bush 1080 arranged in the middle of the front die lower fixing plate 1090 and a runner 1139 communicated with the sprue bush 1080.

Specifically, the upper fixing plate 1040, the lower fixing plate 1070 and the compression spring 1030 are respectively installed between the front mold upper fixing plate 1020 and the front mold lower fixing plate 1090, the compression spring 1030 is in contact with the front mold upper fixing plate 1020, and the front mold core 1110 is installed on the upper mold plate 1120; the insert fixing screw 1010 penetrates through the upper fixing plate 1040, the lower fixing plate 1070 and the front mold lower fixing plate 1090 to be fixedly connected with the front mold core 1110; the front mold core 1110 is provided with a glue inlet 1114, the glue inlet 1114 is communicated with a flow channel 1139, the front mold core 1110 is located in a through hole of the upper mold plate 1120 and is fixed on the front mold upper fixing plate 1020 through an insert fixing screw 1010, the number of the front mold cores 1110 is more than two, in order to improve the production efficiency, the number of the front mold cores 1110 is preferably eight in the embodiment, and the eight front mold cores 1110 are arranged on the upper mold plate 1120 in a circumferential array.

In addition, the movable mold 2 comprises a rear mold fixing plate 1190, mold legs 1180 arranged on two sides of the rear mold fixing plate 1190, a supporting plate 1170 arranged on one side of the mold legs 1180, a lower mold plate 1140 arranged on one side of the supporting plate 1170, at least two rear mold cores 1150 arranged on the lower mold plate 1140, a movable mold side guide rod 1160 arranged on the mold legs 1180 or the supporting plate 1170, and a water gap thimble 1260 arranged between the rear mold fixing plate 1190 and the supporting plate 1170, wherein the movable mold side guide rod 1160 is in sliding connection with the guide rod fixing bolt 1100.

Specifically, the number of the rear mold core 1150 is the same as that of the front mold core 1110, and the position of the rear mold core 1150 is adapted to that of the front mold core 1110, in this embodiment, it is preferable that the number of the front mold core 1110 is eight, and since the optical lens is ejected out of the mold through the fixed mold side, the rear mold core 1150 is not provided with an ejection pin. The optical lens 1130 is molded in a mold cavity (i.e., a cavity) between the front mold core 1110 and the rear mold core 1150, the surface types of the upper and lower surfaces of the optical lens 1130 are identical to those of the front and rear mold cores, and the surfaces of the mold cavities of the front mold core 1110 and the rear mold core 1150 are both processed by nano-scale single-point diamond ultra-precision machining, so that the precision of the surface type of the lens after injection molding can reach the nano-scale of a super-mirror surface. The optical lenses 1130 are connected to each other through a flow channel 1139.

During injection molding, the liquid plastic heated to a molten state enters the flow channel 1139 and each mold cavity through the hole in the middle of the sprue bush 1080, and an optical lens 1130 product is formed after pressure maintaining molding, cooling and solidification. One end of the water gap thimble 1260 penetrates through the supporting plate 1170 and the lower template 1140 to contact with the flow channel 1139 and cool the flow channel 1139, after the optical lens 1130 is cooled in the injection molding process, the cooled flow channel 1139 is ejected and separated by the water gap thimble 1260 in the process that the injection molding machine pulls the movable mold 2 open for demolding, because the optical lens 1130 is relatively steeply bent in the surface of the fixed mold 1, the cooled optical lens has large surface adhesive force and is attached to the mold cavity surface of the front mold core 1110 of the fixed mold 1, the cooled optical lens 1130 is ejected and demolded through an ejection pin 1060 on the ejection device, when the ejection pin 1060 ejects the optical lens 1130, the guide column 1050 is withdrawn and is simultaneously protruded out of the split surface of the upper template 1120, after the optical lens 1130 is demolded, the injection molding machine pushes the movable mold 2 and the fixed mold 1 to close, the split surface of the lower template 1140 positioned on the movable mold 2 pushes the retraction guide column, the ejector pins 1060 of the fixed mold 1 are pushed by the retracting guide posts 1050 to return to the original positions, and the retracting guide posts 1050 also bring the compression springs 1030 to be compressed and reset.

Example two

As shown in fig. 11-13, the utility model also provides an accurate optical lens piece product that is used for drawing of patterns of deciding mould side, including the surface be the smooth mirror surface region 91 of nanometer precision, set up the flange disc 92 of the round outside mirror surface region 91, the both ends head that is provided with cyclic annular distribution on the flange disc 92 has two at least boss structures 93 of circular arc slope transition, is provided with between per two boss structures 93 and has the gluey position 94 of subtracting of circular arc slope transition, boss structure 93's shape characteristic is opposite with the shape of the arc channel shape structure 1112 of front mould benevolence, and position and quantity are corresponding, the shape characteristic of subtracting gluey position 94 is opposite with the empty position 1115 shape of front mould benevolence, and position and quantity are corresponding.

The glue reduction site 94 is lower than the upper surface of the boss structure 93, the glue reduction site 94 is close to or flush with the plane of the flange disc 92, and the glue reduction site 94 can contact with the ejector pin 1060.

Specifically, in this embodiment, the boss structure 93 is disposed on the flange disk 92 in a ring shape near the convex side of the middle of the mirror surface region 91. The boss structure 93 is a lens assembly support surface for ensuring the positional accuracy when assembled with other lenses or components (e.g., mylar sheet, spacer). The raised structures 93 are between 15 microns and 100 microns above the end face of the flange disk 92, and the raised structures 93 are preferably 35 microns above the flange disk 92 in this embodiment.

When the ejector pins 1060 are withdrawn after the demolding is completed, even if there is a burr, the assembling accuracy of the optical lens is not affected by the burr and the flaw caused by the ejector pins 1060 since the glue reducing level 94 is lower than the assembling support surface of the optical lens. The assembling parallelism and the air gap between the lens assembling bearing surface and other lenses can not be influenced, the injection molding precision and the qualification rate of the product are improved, and the optical lens product can adapt to ultrathin high-precision lens demoulding with great thickness ratio and severe edge bending.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.

Claims (18)

1. A precise mold for demolding the side of a fixed mold comprises the fixed mold (1) and a movable mold (2), and is characterized in that the fixed mold (1) comprises at least two front mold cores (1110), and a demolding mechanism (3) is arranged on the fixed mold (1);

the edge of the mirror surface area of the front mold core (1110) is provided with at least two arc channel-shaped structures (1112) which are distributed annularly and have arc slope-shaped transition at two ends, a vacancy avoidance position (1115) is arranged between the arc channel-shaped structures (1112), and the vacancy avoidance position (1115) is provided with an ejection pin hole (1113);

the demolding mechanism (3) comprises at least two ejector pins (1060), and an ejector device arranged on one side of each ejector pin (1060), wherein the ejector device is used for driving the ejector pins (1060) to slide in a telescopic mode along the ejector pin holes (1113).

2. A precise mold for demolding the fixed mold side as claimed in claim 1, wherein the ejection device comprises an upper fixing plate (1040) arranged on the fixed mold (1), a lower fixing plate (1070) fixedly connected with one side of the upper fixing plate (1040), a compression spring (1030) arranged on one side of the upper fixing plate (1040), and a withdrawal guide column (1050) arranged around the upper fixing plate (1040); the ejector pin (1060) is mounted on the lower fixing plate (1070).

3. A precision die for fixed die side demolding according to claim 2, wherein the distance between the lower fixing plate (1070) and the front die lower fixing plate (1090) is 0.2mm-50 mm.

4. A precise mold for demolding the fixed mold side as claimed in claim 1, wherein the ejection device is a spring device, a magnet device, a pneumatic device, an elastic glue device or a hydraulic pushing device.

5. A precision mold for fixed mold side demolding according to claim 1, wherein the fixed mold (1) is provided with eight front mold cores (1110).

6. A precision mold for fixed mold side demolding according to claim 1, wherein the number of the arc channel structures (1112) is three, and the arc channel structures are arranged on the edge of the mirror surface area on the front mold core (1110) in a 120-degree annular mode.

7. A precision mold for fixed mold side demolding according to claim 1, wherein the surface of the vacancy-avoiding place (1115) is a plane or an arc-shaped curved surface.

8. A precision mold for demolding a fixed mold side as claimed in claim 1, wherein the cross-sectional profile of the void-avoiding portion (1115) is in a wave shape with slope-shaped and arc-shaped transition at two sides or in a multi-segment arc shape.

9. A precision mold for demolding the fixed mold side as claimed in claim 1, wherein the surface of the clearance (1115) is higher than the arc-shaped channel-shaped structure (1112), and the surface of the clearance (1115) is flush with or close to the flange plane of the edge of the front mold core (1110).

10. A precision mold for fixed mold side demolding as claimed in claim 1, wherein the sectional shape of said ejector pin (1060) is circular, square, triangular, polygonal, circular, or asymmetric.

11. A precision mold for fixed mold side demolding according to claim 2, wherein the fixed mold (1) comprises a front mold upper fixing plate (1020), a front mold lower fixing plate (1090) installed at one side of the front mold upper fixing plate (1020), and an upper mold plate (1120) installed at one side of the front mold lower fixing plate (1090);

the upper fixing plate (1040), the lower fixing plate (1070) and the compression spring (1030) are respectively arranged between the front mold upper fixing plate (1020) and the front mold lower fixing plate (1090), the compression spring (1030) is in contact with the front mold upper fixing plate (1020), and the front mold core (1110) is arranged on the upper mold plate (1120).

12. A precision mold for demolding a fixed mold side as claimed in claim 11, wherein the fixed mold (1) further comprises insert fixing screws (1010) arranged on the upper fixing plate (1020) of the front mold, and the insert fixing screws (1010) are fixedly connected with the front mold core (1110) through the upper fixing plate (1040), the lower fixing plate (1070) and the lower fixing plate (1090) of the front mold.

13. The precise mold for demolding the fixed mold side as claimed in claim 11, wherein the fixed mold (1) further comprises a guide rod fixing bolt (1100) arranged around the upper mold plate (1120), a sprue bush (1080) arranged in the middle of the front mold lower fixing plate (1090), and a runner (1139) communicated with the sprue bush (1080), the front mold core (1110) is provided with a glue inlet (1114), and the glue inlet (1114) is communicated with the runner (1139).

14. The precise mold for demolding the fixed mold side as claimed in claim 1, wherein the movable mold (2) comprises a rear mold fixing plate (1190), mold legs (1180) arranged on two sides of the rear mold fixing plate (1190), a supporting plate (1170) arranged on one side of the mold legs (1180), a lower template (1140) arranged on one side of the supporting plate (1170), and at least two rear mold cores (1150) arranged on the lower template (1140), wherein the number of the rear mold cores (1150) is the same as that of the front mold cores (1110), and the positions of the rear mold cores (1150) are matched with that of the front mold cores (1110).

15. The precise mold for demolding the fixed mold side as claimed in claim 14, wherein the movable mold (2) further comprises a movable mold side guide rod (1160) arranged on a mold foot (1180) or a supporting plate (1170), and a water gap ejector pin (1260) arranged between the rear mold fixing plate (1190) and the supporting plate (1170), wherein one end of the water gap ejector pin (1260) penetrates through the supporting plate (1170) and the lower mold plate (1140) in sequence.

16. A precise optical lens for mold-fixing side demolding, which is manufactured by the precise mold for mold-fixing side demolding according to any one of claims 1 to 15, and which comprises a mirror surface area (91) with a nano-scale precision smooth surface, a flange disc (92) arranged in a circle outside the mirror surface area (91), at least two boss structures (93) with arc slope-shaped transition at two ends and distributed annularly are arranged on the flange disc (92), a glue reducing position (94) with arc slope-shaped transition is arranged between every two boss structures (93), the shape characteristics of the boss structures (93) are opposite to the shape of the arc channel-shaped structure (1112) of the front mold core (1110), and the positions and the number of the boss structures correspond to each other, the shape characteristics of the glue reducing position (94) are opposite to the shape of the clearance position (1115) of the front mold core (1110), and the positions and the number correspond to each other.

17. A precision optical lens for mold side stripping as claimed in claim 16 wherein the glue reduction site (94) is lower than the upper surface of the boss structure (93), the glue reduction site (94) is close to or flush with the plane of the flange disk (92), the glue reduction site (94) is capable of contacting the ejector pin (1060).

18. A precision optical lens for mold side stripping according to claim 16, characterized in that the distance of the boss structure (93) above the flange disc (92) is between 10 and 500 μm.

Images