CN114474586A

CN114474586A - Defocused lens forming die

Info

Publication number: CN114474586A
Application number: CN202111324685.1A
Authority: CN
Inventors: 陈冠南; 周瑜
Original assignee: Albo Technology Co ltd
Current assignee: Albo Technology Co ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-05-13
Anticipated expiration: 2041-11-10
Also published as: CN114474586B

Abstract

The invention relates to the technical field of glasses processing, and particularly discloses a defocused lens forming die which comprises an upper die and a lower die, wherein the upper die is provided with a concave curved surface used for forming the front surface of a spectacle lens, the lower die is provided with a convex curved surface used for forming the rear surface of the spectacle lens, and the concave curved surface of the upper die and the convex curved surface of the lower die are matched to form a containing cavity; the upper die comprises a plurality of annular splicing blocks, the splicing blocks are coaxially arranged from inside to outside, and one sides of the splicing blocks are spliced into a concave curved surface; the lower die comprises a plurality of fan-shaped modules, and one sides of the modules are spliced into a convex curved surface. The invention has the advantages that the concave annular groove with the same size as the annular lens structure is arranged on the concave curved surface of the upper die, the annular lens structure can be directly formed on the front surface of the spectacle lens during injection molding, and the spectacle lens subjected to injection molding can be polished to form the out-of-focus lens, so that the manufacturing cost of the out-of-focus lens can be greatly reduced.

Description

Defocused lens forming die

Technical Field

The invention relates to the technical field of glasses processing, in particular to a defocusing lens forming die.

Background

Medical science today admits: the growth of the eyeballs of the human visual eyes depends on the regulation and control of the peripheral retina focus, the peripheral retina hyperopic defocus promotes the growth of the eyeballs, the peripheral retina hyperopic defocus is corrected, and the growth of the myopic eyeballs can be controlled. The inner side or the outer side area of the traditional myopia spectacle lens and the central area are concave lens sheets with the same degree, the concave lens sheets in the central area of the spectacle lens correct the central myopic defocusing of the retina, simultaneously, the concave lens sheets in the inner side and the outer side peripheral area of the spectacle lens increase the peripheral hyperopic defocusing of the inner side and the outer side of the spectacle lens, promote the growth of eyeballs and increase the myopic degree, under the condition, the defocusing spectacle lens for performing myopia correction aiming at the inner side retina and the outer side retina appears on the market, the prior art discloses a Chinese patent with a patent number of CN202110815415.4, provides a myopia spectacle lens for protecting the vision of eyes, an annular convex lens is arranged on the surface of the correcting spectacle lens, a functional spectacle body only converges incident light on the cross section of the functional spectacle body, leads the light on the same cross section to converge towards the direction of the circle center of the cross section, converges to a limit position and then diffuses far in a divergent mode, on the same functional lens body, parallel light rays incident on different cross sections do not converge together, namely, the light rays passing through the functional lens body do not form an image on a retina, and the light rays which do not form an image cannot induce backward adjustment of eyes, so that the myopia is prevented from deepening; as another example, the patent numbers are: CN202110656194.0 chinese patent discloses an ophthalmic lens, wherein the tilt directions of the first lens and the second lens are not the same, so that the focused light beams are deflected differently, the parallel light beams are refracted outwardly by the first lens, and are combined and refracted by the inner surface of the ophthalmic lens to finally form an image on the retina, which is a correction area, the parallel light beams are refracted inwardly by the second lens, and are combined and refracted by the inner surface of the ophthalmic lens to finally form an image on the front of the retina, which is a defocus area, by the above arrangement, the light beams realize the change of the light refraction position and the focus position according to the given bending requirements of the first lens and the second lens, so as to ensure that the light beams are just focused on the retina, and the second refraction area is focused on the front of the retina, so as to avoid hypermetropia, thereby effectively inhibiting the backward growth tendency of the eyeball, and playing the role of myopia prevention and control; above-mentioned patent has all proposed that the mode that sets up convex lens on the lens surface realizes out of focus, and the processing of lens among the prior art adopts the mould shaping to become the blank more, then the mode shaping of polishing through the cutting, and this kind of mode is applicable to the lens of spherical, and out of focus lens's structure is complicated, especially the structure of lens front surface, and the annular lens size of front surface is very little, and the height that outstanding lens surface is 0.005 ~ 0.1mm, adopts ordinary cutting process to be difficult to process, and the processing cost is high.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a defocused lens forming mold.

The purpose of the invention is realized by the following technical scheme: a defocused lens forming die comprises an upper die and a lower die, wherein the upper die is provided with a concave curved surface for forming the front surface of a spectacle lens, the lower die is provided with a convex curved surface for forming the rear surface of the spectacle lens, and the concave curved surface of the upper die and the convex curved surface of the lower die are matched to form a containing cavity;

the upper die comprises a plurality of splicing blocks, the splicing blocks are spliced into the upper die, one sides of the splicing blocks are spliced into a concave curved surface, the other sides of the splicing blocks are positioning surfaces, and the upper die further comprises a mounting seat, and the splicing blocks are fixed on the mounting seat; grooves for forming out-of-focus lens annular lenses are formed in the surfaces, spliced into the concave curved surfaces, of the splicing blocks; the splicing blocks are of annular or fan-shaped structures;

the lower die comprises a plurality of fan-shaped modules which are spliced into a complete lower die, one sides of the modules are spliced into a convex curved surface, the other sides of the modules are positioning surfaces, and the lower die further comprises a base, and the modules are installed on the base.

Specifically, be provided with the mounting groove on the mount pad, the bottom surface of mounting groove is the locating surface, and is a plurality of all seted up a plurality of screw holes on the locating surface of splice, set up the mounting hole that corresponds with the screw hole on the splice on the mount pad, the bolt is put into to the mounting hole and screw hole threaded connection fixes the splice on the mount pad.

Specifically, the mounting base on seted up the air vent, the air vent is the through-hole, and its one end intercommunication the mounting groove, the through-hole is provided with a plurality ofly, and a plurality ofly the air vent distributes and sets up on a plurality of concentric circles, a plurality ofly the air vent corresponds the setting with a plurality of splice blocks.

Specifically, the base on be provided with the constant head tank, the bottom surface of constant head tank is the locating surface, and is a plurality of all seted up a plurality of location screw holes on the locating surface of module, set up the locating hole that corresponds with the location screw hole on the module on the base, positioning bolt and location screw hole threaded connection are put into to the locating hole and are fixed the module on the base.

Specifically, the base is provided with a plurality of second vent holes, the second vent holes are through holes, one end of each second vent hole is communicated with the positioning groove, the second vent holes are distributed on a plurality of concentric circles, and the second vent holes are arranged corresponding to the modules.

The fixture comprises a mounting seat and a base, and is characterized in that a centering structure is arranged on the mounting seat and the base, the centering structure comprises a fixing sleeve, an external thread A is arranged on the fixing sleeve, the positioning groove and the mounting groove are identical in structure and comprise a thread section, a conical section and a straight section, the thread section, the conical section and the straight section are sequentially arranged, the fixing sleeve is in threaded connection with the thread section, a plurality of sliding grooves are formed in one end face of the fixing sleeve and are arranged in a manner of radial uniform distribution in the center of the fixing sleeve, the centering structure further comprises a fixture block, one end of the fixture block is in sliding fit with the sliding grooves, the fixture block is wedge-shaped, and the bevel edge of the fixture block is matched with the bevel angle of the conical section.

Specifically, the spout be T type groove, the one end of fixture block be provided with the slider that matches with the spout, slider and spout sliding fit are provided with reset spring in the spout, reset spring's one end is fixed in the spout, the other end with the slider butt.

Specifically, the vent hole and the second vent hole are both in threaded connection with a joint.

Specifically, the surface of base is provided with the toper constant head tank, set up the frustum that matches with the toper constant head tank on the terminal surface of mount pad.

Specifically, all be provided with the connecting hole on base and the mount pad, base and mount pad are put into locking bolt fixed connection through the connecting hole and are in the same place, the runner has been seted up between base and the mount pad, the runner intercommunication hold the chamber.

The invention has the following advantages:

1. the concave annular groove with the same size as the annular lens structure is arranged on the concave curved surface of the upper die, the annular lens structure can be directly formed on the front surface of the spectacle lens during injection molding, and the spectacle lens subjected to injection molding can be polished to form the out-of-focus lens, so that the manufacturing cost of the out-of-focus lens can be greatly reduced.

2. The invention designs the upper die into a modularized structure, a plurality of annular splicing blocks are spliced together into a complete upper die, the splicing blocks are in a concentric structure, the central splicing block is cylindrical, the other splicing blocks are coaxially arranged from inside to outside in sequence, and the splicing blocks are tightly attached together, so that one side with the same splicing blocks can be spliced into a complete concave curved surface, the splicing blocks corresponding to the annular lens 17 are selected to be spliced according to different shape and size requirements, the required shapes can be randomly combined, the reuse rate of the splicing blocks can be improved, the number of the dies can be reduced, the use cost of the dies can be reduced, similarly, the lower die is also in a modularized design, the lower die is formed by splicing a plurality of fan-shaped modules, and the defocused spectacle lens has a far light area, a near light area, an inner light area and an outer light area which are all fan-shaped areas, the module that splices into the bed die can correspond respectively with above-mentioned light area, the diopter in every light area can be the same also can be different, can choose complete integrated into one piece's bed die for use when every light area adopts the same diopter, if adopt different diopters, so can select the module that corresponds to splice, the bed die of final formation concatenation, fix every module and just can use on the base, finally fix mount pad and base together just can form complete forming die, form between last mould and the bed die and hold the chamber this moment, toward holding the intracavity and inject the material and just can carry out the shaping of lens, adopt such mode can reduce the use cost of mould, can select different module concatenation to go up mould 4 and bed die according to the demand of difference, use nimble diversification.

Drawings

FIG. 1 is a schematic view of the overall structure of a forming mold according to the present invention;

FIG. 2 is a schematic cross-sectional view of a forming mold according to the present invention;

FIG. 3 is a schematic view of the upper mold structure of the present invention;

FIG. 4 is a schematic view of the back structure of the upper mold of the present invention;

FIG. 5 is a schematic view of the lower mold structure of the present invention;

FIG. 6 is a schematic view of the mounting base structure of the present invention;

FIG. 7 is a schematic view of a base structure of the present invention;

fig. 8 is a schematic view of the structure of the fixing sleeve of the present invention;

FIG. 9 is a diagram illustrating a cartridge structure according to the present invention;

FIG. 10 is a schematic view of a fitting structure of the fixture block and the fixing sleeve according to the present invention;

FIG. 11 shows the structure of an out-of-focus lens;

FIG. 12 is a first structural view of a ring lens;

FIG. 13 is a second structural view of the ring lens;

in the figure: 1-mounting seat, 2-base, 3-lower die, 31-module, 32-positioning threaded hole, 4-upper die, 41-splicing block, 42-threaded hole, 5-mounting groove, 51-straight cylinder section, 52-conical section, 53-threaded section, 6-mounting hole, 7-frustum, 8-vent hole, 9-positioning groove, 10-positioning hole, 11-second vent hole, 12-fixing sleeve, 121-chute, 13-clamping block, 131-sliding block, 14-locking bolt, 15-sprue, 16-cavity, 17-ring lens and 18-spectacle lens.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element identified by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following. As shown in fig. 1 to 13, a defocused lens forming mold comprises an upper mold 4 and a lower mold 3, wherein the upper mold 4 has a concave curved surface for forming a front surface of a spectacle lens 18, the lower mold 3 has a convex curved surface for forming a rear surface of the spectacle lens 18, and the concave curved surface of the upper mold 4 and the convex curved surface of the lower mold 3 cooperate to form a cavity 16;

the upper die 4 comprises a plurality of splicing blocks 41, the splicing blocks 41 are spliced into the upper die 4, one sides of the splicing blocks 41 are spliced into a concave curved surface, the other sides of the splicing blocks 41 are positioning surfaces, the upper die further comprises an installation seat 1, and the splicing blocks 41 are fixed on the installation seat 1; grooves for forming out-of-focus lens annular lenses are formed in the surfaces, spliced into the concave curved surfaces, of the splicing blocks 41; the splicing blocks 41 are in an annular or fan-shaped structure;

the lower die 3 comprises a plurality of fan-shaped modules 31, the plurality of modules 31 are spliced into the complete lower die 3, one sides of the plurality of modules 31 are spliced into a convex curved surface, the other sides of the plurality of modules 31 are positioning surfaces, the lower die further comprises a base 2, and the plurality of modules 31 are installed on the base 2. The defocusing lens forming die in the embodiment is used for forming a defocusing lens, a plurality of protruding concentric annular lenses 17 are arranged on the front surface of the defocusing lens, the cross sections of the annular lenses 17 can be circular arc-shaped or arc-shaped structures inclined to one side, a containing cavity 16 is formed between an upper die 4 and a lower die 3 when the upper die 4 and the lower die 3 are spliced together, the containing cavity 16 is used for casting materials, the materials are cooled to form a lens with the same shape as the containing cavity 16, in the prior art, the lens is processed by forming a blank through a die and then forming through a cutting and grinding mode, the mode is suitable for a spherical lens 18, the structure of the defocusing lens is complex, particularly the structure of the front surface of the lens 18, the size of the annular lenses 17 on the front surface is small, and the height of the surfaces of the protruding lens 18 is 0.005-0.1 mm, the specific height is confirmed according to the defocusing amount, the common cutting process is difficult to process, and the processing cost is high, therefore, the embodiment adopts the structure that the concave curved surface of the upper die 4 is provided with the groove with the same size as the structure of the annular lens 17, the annular lens 17 can be directly formed on the front surface of the spectacle lens 18 during injection molding, and the defocusing lens can be formed by polishing the injection molded spectacle lens 18, so that the manufacturing cost of the defocusing lens can be greatly reduced, and the spectacle lens 18 meeting the requirements can be manufactured as long as the precision of the die is controlled. In addition, according to different requirements, the sizes of the annular lenses 17 in the out-of-focus spectacle lenses 18 are different, and are embodied as that the sizes of different annular lenses 17 on the same spectacle lens 18 are different, for example, the heights of the protruding front surfaces of different arc-shaped annular lenses 17 are different, or the inclination angles and directions of the arc-shaped annular lenses 17 are different, so that according to different requirements, the front surface structures of the spectacle lenses 18 have a plurality of different combinations, if the integrally formed upper mold 4 is matched according to each combination, the cost of the mold is increased, therefore, the upper mold 4 is designed into a modular structure, a plurality of annular splicing blocks 41 are jointly spliced into a complete upper mold 4, the splicing blocks 41 are of a concentric cylindrical structure, wherein the central splicing block 41 is a cylindrical structure, the rest splicing blocks 41 are coaxially arranged from inside to outside in sequence, and the splicing blocks 41 are tightly and mutually attached, therefore, the same side of the splicing blocks 41 can be spliced into a complete concave curved surface, the splicing blocks 41 corresponding to the annular lens 17 are selected according to different shape and size requirements for splicing, the required shapes can be combined randomly, the reuse rate of the splicing blocks 41 can be improved, the number of the molds is reduced, the use cost of the molds is reduced, each splicing block 41 can be processed independently, or the splicing blocks 41 can be cut into a plurality of splicing blocks 41 by adopting a high-precision linear cutting device after being processed and formed into an integrated upper mold 4, and the upper mold 4 can be formed by fixing the required splicing blocks 41 on the mounting seat 1 after the required splicing blocks 41 are selected; similarly, the lower mold 3 is also designed in a modularized manner, the lower mold 3 is formed by splicing a plurality of fan-shaped modules 31, the out-of-focus spectacle lens 18 has a far light area a, a near light area C, an inner light area D and an outer light area B, wherein the fan-shaped angle α of the inner light area D is 50-90 °, the fan-shaped angle β of the outer light area B is 50-90 °, the areas are fan-shaped areas, the modules 31 spliced into the lower mold 3 can respectively correspond to the light areas, the diopter of each light area can be the same or different, the lower mold 3 integrally formed can be selected when each light area has the same diopter, if different diopters are adopted, the corresponding modules 31 can be selected for splicing, the spliced lower mold 3 is finally formed, each module 31 can be used by fixing on the base 2, and finally the mounting base 1 and the base 2 can be fixed together to form a complete forming mold, at this moment, the cavity 16 is formed between the upper mold 4 and the lower mold 3, the molding of the lens 18 can be carried out by injecting materials into the cavity 16, the use cost of the mold can be reduced by adopting the mode, the upper mold 4 and the lower mold 3 can be spliced by selecting different modules 31 according to different requirements, the use is flexible and diversified, simultaneously, each regional diopter difference can be spliced by corresponding to the fan-shaped splicing blocks 41 to form the upper mold 4, the depth of the groove on each splicing block 41 is different, the annular lenses 17 with different protruding heights are correspondingly formed, the heights of the different diopter annular lenses 17 are different, therefore, the upper mold 4 in the embodiment adopts the annular splicing blocks 41 and the fan-shaped splicing blocks 41 to carry out the injection molding of the lens, and different types are selected according to different requirements.

Further, the mounting seat 1 is provided with a mounting groove 5, the bottom surface of the mounting groove 5 is a positioning surface, a plurality of threaded holes 42 are formed in the positioning surface of the splicing block 41, a mounting hole 6 corresponding to the threaded hole 42 in the splicing block 41 is formed in the mounting seat 1, and the mounting hole 6 is connected with the threaded hole 42 through threads to fix the splicing block 41 on the mounting seat 1. In this embodiment, the mounting seat 1 is provided with the mounting groove 5 for mounting the upper mold 4, one surface of the upper mold 4 opposite to the concave curved surface is designed to be a positioning surface, similarly, the bottom surface of the mounting groove 5 is also a positioning surface, and the mounting accuracy of the upper mold 4 can be controlled by adopting the cooperation of the two positioning surfaces, so that the accuracy of the spliced concave curved surface meets the requirement, the splicing blocks 41 are provided with the threaded holes 42, the threaded holes 42 are used for connecting bolts in a threaded manner, the mounting seat 1 is provided with the mounting holes 6 corresponding to the bolts, wherein four threaded holes 42 are preferably arranged on each splicing block 41 in a circumferential array, the threaded holes 42 are blind holes, the bolts penetrate through the mounting holes 6 and are in threaded connection with the threaded holes 42, so that the splicing blocks 41 can be fixed on the mounting seat 1, the processing accuracy required by the splicing blocks 41 is high, and therefore, the coaxiality of each splicing block 41 can be ensured during splicing, and the spliced gap is small, the injection molding is not influenced, the injection molding material cannot enter the gap, and even the injection molding material enters the gap, the injection molding material is a small part which can be eliminated in the later polishing of the spectacle lens 18, and the molding quality of the spectacle lens 18 is not influenced.

Furthermore, the mounting base 1 is provided with a plurality of vent holes 8, each vent hole 8 is a through hole, one end of each vent hole is communicated with the mounting groove 5, the plurality of through holes are formed, the vent holes 8 are distributed on a plurality of concentric circles, and the vent holes 8 are arranged corresponding to the splicing blocks 41. In the embodiment, the installation seat 1 is provided with the vent holes 8, the vent holes 8 are used for connecting an air tightness detection device, in order to ensure the installation precision of the upper die 4 on the installation seat 1, the positioning surface of each splicing block 41 is required to be completely attached to the positioning surface of the installation groove 5, so that the installation precision can be ensured, in the embodiment, the installation precision is detected in an air tightness detection mode, after the splicing blocks 41 are arranged in the installation groove 5 and attached to the positioning surfaces, each splicing block 41 can shield the corresponding vent hole 8, the vent holes 8 are distributed on different circumferences, each circumference is arranged corresponding to the corresponding splicing block 41, four vent holes 8 are preferably arranged on each circumference in a circumferential array, each vent hole 8 is connected to the air tightness detection device through a connector during air tightness detection, and the air tightness of the splicing block 41 at the vent hole 8 and the installation seat 1 is detected, the splicing blocks 41 are tightly attached to the mounting base 1 when the detection is qualified, if the detection of the four vent holes 8 on each circumference is qualified, the splicing blocks 41 are integrally mounted on the mounting base 1 to meet the precision requirement, and if the detection of each splicing block 41 is qualified, the integral splicing meets the precision requirement, so that the precision of the spliced concave curved surface can be ensured.

Further, the base 2 is provided with a positioning groove 9, the bottom surface of the positioning groove 9 is a positioning surface, a plurality of positioning threaded holes 32 are formed in the positioning surface of the module 31, the base 2 is provided with positioning holes 10 corresponding to the positioning threaded holes 32 in the module 31, and the positioning holes 10 are connected with the positioning threaded holes 32 in a threaded manner to fix the module 31 on the base 2 through positioning bolts. Similarly, be provided with the constant head tank 9 that is used for installing bed die 3 on base 2, the bottom surface of bed die 3 is the locating surface, the bottom surface of constant head tank 9 is the locating surface, place bed die 3 in the geostationary inslot makes the locating surface of bed die 3 and the laminating of locating surface of constant head tank 9 during the installation, realize the location through the laminating of locating surface and locating surface, be provided with location screw hole 32 on the module 31 of constituteing bed die 3, be provided with two at least location screw hole 32 on every module 31, it is provided with locating hole 10 to correspond on base 2, positioning bolt passes locating hole 10 and fixes module 31 on base 2 with location screw hole 32 threaded connection, every module 31 carries out fixed connection through two at least positioning bolt, it is fixed more stable, same location screw hole 32 also is the blind hole.

Further, a plurality of second vent holes 11 are formed in the base 2, the second vent holes 11 are through holes, one end of each second vent hole 11 is communicated with the positioning groove 9, the second vent holes 11 are distributed on a plurality of concentric circles, and the second vent holes 11 are arranged corresponding to the modules 31. In order to meet the installation accuracy of the lower die 3, a plurality of second vent holes 11 are also formed in the base 2, the second vent holes 11 are also distributed on different circumferences, four second vent holes 11 are preferably arranged on each circumference in an array mode, each module 31 corresponds to the plurality of second vent holes 11, each second vent hole 11 is connected to an air tightness detection device through a connector during air tightness detection, the air tightness of the module 31 at the position of each second vent hole 11, which is attached to the base 2, is detected to be qualified, namely the module 31 is tightly attached to the base 2, if the second vent hole 11 corresponding to each module 31 is detected to be qualified, the fact that the whole module 31 and the base 2 are installed to meet the accuracy requirement is indicated, and if each module 31 is detected to be qualified, the fact that the whole splicing meets the accuracy requirement is indicated, and the accuracy of the spliced convex curved surface can be guaranteed.

Further, the mounting seat 1 and the base 2 are both provided with a centering structure, the centering structure comprises a fixing sleeve 12, the fixing sleeve 12 is provided with external threads, the positioning groove 9 and the mounting groove 5 are structurally identical and respectively comprise a thread section 53, a conical section 52 and a straight cylinder section 51, the thread section 53, the conical section 52 and the straight cylinder section 51 are sequentially arranged, the fixing sleeve 12 is in threaded connection with the thread section 53, the end face of one end of the fixing sleeve 12 is provided with a plurality of sliding grooves 121, the sliding grooves 121 are radially and uniformly arranged in the center of the fixing sleeve 12, the centering structure further comprises a fixture block 13, one end of the fixture block 13 is in sliding fit with the sliding grooves 121, the fixture block 13 is wedge-shaped, the bevel edge of the fixture block 13 is matched with the bevel angle of the conical section 52, the sliding grooves 121 are T-shaped grooves, one end of the fixture block 13 is provided with a sliding block 131 matched with the sliding grooves 121, the sliding block 131 is in sliding fit with the sliding groove 121, a return spring is arranged in the sliding groove 121, one end of the return spring is fixed in the sliding groove 121, and the other end of the return spring is abutted to the sliding block 131. When the upper mold 4 is mounted on the mounting seat 1 and the lower mold 3 is mounted on the base 2 and then spliced together, the molding quality of the spectacle lens 18 can be ensured only when the coaxiality of the upper mold 4 and the lower mold 3 meets the requirement, so that in the embodiment, the centering structures are arranged on the mounting seat 1 and the base 2 to ensure that the upper mold 4 and the mounting seat 1 are coaxial and the lower mold 3 and the base 2 are coaxial, so that the coaxiality of the upper mold 4 and the lower mold 3 can be kept to meet the requirement when the mounting seat 1 and the base 2 are spliced together; the opening of the mounting groove 5 is a threaded section 53, the diameter of the threaded section 53 is greater than that of the straight cylinder section 51, the threaded section 53 and the straight cylinder section 51 are transited through a conical section 52, an external thread is arranged on the fixing sleeve 12, the external thread of the fixing sleeve 12 is in threaded connection with the threaded section 53 of the mounting groove 5, the fixing sleeve 12 is provided with a central through hole, the diameter of the central through hole is the same as that of the straight cylinder section 51 of the mounting groove 5, the bottom surface array of the fixing sleeve 12 is provided with a plurality of sliding grooves 121 arranged along the radial direction, a sliding block 131 matched with the sliding grooves 121 is arranged on the fixture block 13, the fixture block 13 can move along the radial direction of the fixing sleeve 12 after the sliding block 131 is matched with the sliding grooves 121, the fixture block 13 is in a wedge-shaped structure, the inclined edge of the fixture block is matched with the inclined surface of the conical section 52, so that the fixture block 13 is pressed down by the fixing sleeve 12 when the fixing sleeve 12 is in threaded connection with the mounting seat 1, the conical section 52, the fixture block 13 moves along the sliding groove 121 towards the axis of the fixing sleeve 12 while moving downwards along the conical section 52, at the moment, the clamping blocks 13 approach to each other to clamp the upper die 4, so that the axis of the upper die 4 is superposed with the axis of the mounting seat 1, and the upper die 4 and the mounting seat 1 are coaxial; similarly, the lower die 3 is formed by splicing fan-shaped modules 31, the precision of the spliced cylindrical lower die 3 is difficult to ensure when the fan-shaped modules 31 are spliced, the fan-shaped modules 31 are easy to shift, and the splicing precision problem cannot be solved by fixing positioning bolts, the clamping blocks 13 of the embodiment can drive the fan-shaped modules 31 to approach the axis when the clamping blocks 13 contract and approach, so that the spliced lower die 3 has higher precision, therefore, the splicing precision of the lower die 3 can be higher due to the centering structure arranged on the base 2, and the coaxiality of the lower die 3 and the base 2 can be ensured at the same time, in addition, when the upper die 4 is a fan-shaped splicing block 41, the installation precision can be improved due to the centering structure if the modules 31 are the same; in addition, a return spring is arranged in the sliding groove 121, the return spring is compressed when the fixture block 13 moves along the axis of the fixing sleeve 12, and the return spring drives the fixture block 13 to return when the fixing sleeve 12 is loosened from the base 2, so that the fixture block 13 loosens the lower die 3 and the upper die 4.

Further, the vent hole 8 and the second vent hole 11 are both connected with a joint in a threaded manner. The connector is used for connecting the air tightness detection device, and the air tightness detection device is connected through the connector when the air tightness detection is needed, and the air tightness detection device can be disconnected from the connector after the detection is completed.

Further, the surface of base 2 is provided with toper constant head tank 9, set up on the terminal surface of mount pad 1 with the frustum 7 of toper constant head tank 9 matching. In order to guarantee the connection axiality of base 2 and mount pad 1, this embodiment sets up toper constant head tank 9 on base 2 terminal surface, sets up frustum 7 on the terminal surface of mount pad 1, realizes the axiality installation of base 2 and mount pad 1 through the cooperation of frustum 7 and toper constant head tank 9.

Further, all be provided with the connecting hole on base 2 and the mount pad 1, base 2 and mount pad 1 are put into locking bolt 14 fixed connection together through the connecting hole, runner 15 has been seted up between base 2 and the mount pad 1, runner 15 communicates hold the chamber 16. The base 2 and the mounting seat 1 are fixed together by matching with bolts through the arrangement of the connecting holes.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.

Claims

1. The utility model provides a defocus lens forming die which characterized in that: the mold comprises an upper mold (4) and a lower mold (3), wherein the upper mold (4) is provided with a concave curved surface for molding the front surface of a spectacle lens, the lower mold (3) is provided with a convex curved surface for molding the rear surface of the spectacle lens, and the concave curved surface of the upper mold (4) is matched with the convex curved surface of the lower mold (3) to form a containing cavity (16);

the upper die (4) comprises a plurality of splicing blocks (41), the splicing blocks (41) are spliced into the upper die (4), one sides of the splicing blocks (41) are spliced into a concave curved surface, the other sides of the splicing blocks (41) are positioning surfaces, the upper die further comprises a mounting seat (1), and the splicing blocks (41) are fixed on the mounting seat (1); grooves for forming out-of-focus lens annular lenses are formed in the surfaces, spliced into the concave curved surfaces, of the splicing blocks (41); the splicing blocks (41) are of annular or fan-shaped structures;

the lower die (3) comprises a plurality of fan-shaped modules (31), the modules (31) are spliced into the complete lower die (3), one sides of the modules (31) are spliced into a convex curved surface, the other sides of the modules (31) are positioning surfaces, the lower die further comprises a base (2), and the modules (31) are installed on the base (2).

2. The off-focus lens forming mold according to claim 1, wherein: be provided with mounting groove (5) on mount pad (1), the bottom surface of mounting groove (5) is the locating surface, and is a plurality of all seted up a plurality of screw holes (42) on the locating surface of concatenation piece (41), set up mounting hole (6) that correspond with screw hole (42) on concatenation piece (41) on mount pad (1), bolt and screw hole threaded connection are put into in mounting hole (6) and splice piece (41) and fix on mount pad (1).

3. The off-focus lens forming mold according to claim 2, wherein: the mounting seat (1) on seted up air vent (8), air vent (8) are the through-hole, its one end intercommunication mounting groove (5), air vent (8) are provided with a plurality ofly, and a plurality ofly air vent (8) distribute to set up on a plurality of concentric circles, a plurality ofly air vent (8) and a plurality of splice block (41) correspond the setting.

4. The off-focus lens forming mold according to claim 3, wherein: the base (2) on be provided with constant head tank (9), the bottom surface of constant head tank (9) is the locating surface, and is a plurality of all seted up a plurality of location screw hole (32) on the locating surface of module (31), set up locating hole (10) that correspond with location screw hole (32) on module (31) on base (2), set into positioning bolt and location screw hole threaded connection in locating hole (10) and fix module (31) on base (2).

5. The off-focus lens forming mold according to claim 4, wherein: the base (2) on seted up a plurality of second venthole (11), second venthole (11) are the through-hole, its one end intercommunication constant head tank (9), and a plurality of second venthole (11) distribute and set up on a plurality of concentric circles, a plurality of second venthole (11) and a plurality of module (31) correspond the setting.

6. The off-focus lens forming mold according to claim 4, wherein: the mounting seat (1) and the base (2) are both provided with centering structures, the centering structures comprise fixed sleeves (12), the fixing sleeve (12) is provided with external threads, the positioning groove (9) and the mounting groove (5) have the same structure and respectively comprise a thread section (53), a conical section (52) and a straight cylinder section (51), the thread section (53), the conical section (52) and the straight cylinder section (51) are arranged in sequence, the fixed sleeve (12) is in threaded connection with the threaded section (53), a plurality of sliding grooves (121) are formed in the end face of one end of the fixed sleeve (12), the sliding grooves (121) are radially and uniformly distributed in the center of the fixed sleeve (12), the centering structure further comprises a clamping block (13), one end of the clamping block (13) is in sliding fit with the sliding groove (121), the clamping block (13) is wedge-shaped, the inclined edge of the fixture block (13) is matched with the inclined angle of the conical section (52).

7. The off-focus lens forming mold according to claim 6, wherein: the sliding groove (121) is a T-shaped groove, a sliding block (131) matched with the sliding groove (121) is arranged at one end of the clamping block (13), the sliding block (131) is in sliding fit with the sliding groove (121), a return spring is arranged in the sliding groove (121), one end of the return spring is fixed in the sliding groove (121), and the other end of the return spring is abutted to the sliding block (131).

8. The off-focus lens forming mold according to claim 5, wherein: the vent hole (8) and the second vent hole (11) are both in threaded connection with a joint.

9. The off-focus lens forming mold according to claim 4, wherein: the surface of base (2) is provided with toper constant head tank (12), set up frustum (7) with toper constant head tank (12) matching on the terminal surface of mount pad (1).

10. The off-focus lens forming mold according to claim 9, wherein: all be provided with the connecting hole on base (2) and mount pad (1), base (2) and mount pad (1) are put into locking bolt (14) through the connecting hole and are fixed connection together, runner (15) have been seted up between base (2) and mount pad (1), runner (15) intercommunication hold chamber (16).