WO2010098466A1 - 成形型およびプラスチックレンズの製造方法 - Google Patents
成形型およびプラスチックレンズの製造方法 Download PDFInfo
- Publication number
- WO2010098466A1 WO2010098466A1 PCT/JP2010/053159 JP2010053159W WO2010098466A1 WO 2010098466 A1 WO2010098466 A1 WO 2010098466A1 JP 2010053159 W JP2010053159 W JP 2010053159W WO 2010098466 A1 WO2010098466 A1 WO 2010098466A1
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- WIPO (PCT)
- Prior art keywords
- mold
- opening
- injection
- plastic lens
- cavity
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/24—Feeding the material into the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00413—Production of simple or compound lenses made by moulding between two mould parts which are not in direct contact with one another, e.g. comprising a seal between or on the edges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/0048—Moulds for lenses
- B29D11/00538—Feeding arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0077—Moulds or cores; Details thereof or accessories therefor characterised by the configuration of the mould filling gate ; accessories for connecting the mould filling gate with the filling spout
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/003—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor characterised by the choice of material
- B29C39/006—Monomers or prepolymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
Definitions
- the present invention relates to a mold for molding a plastic lens by casting polymerization and a method for producing a plastic lens using the mold.
- Plastic lenses for spectacles are generally formed by cast polymerization.
- Cast polymerization is a method in which a curable plastic raw material liquid is injected into a mold and cured by heat or energy such as ultraviolet rays to obtain a molded product.
- the mold used for the casting polymerization is formed by, for example, making a pair of molds face each other with a predetermined interval and sticking an adhesive tape around the entire periphery of the molds.
- Patent Document 1 describes a plastic raw material liquid injection device for plastic lens molding.
- the plastic raw material liquid injection device described in Patent Document 1 includes an injection pipe for injecting a plastic raw material liquid into a mold and an intake pipe provided beside the injection pipe.
- part of the joining portion of the adhesive tape is peeled off to provide an opening, and the injection tube is inserted into the mold.
- the tip of the intake pipe is positioned at the level of the liquid surface when the plastic raw material liquid is filled in the mold.
- the liquid level reaches the tip of the intake pipe and closes the intake port, so that the negative pressure in the intake pipe changes.
- the plastic raw material liquid injection device stops the injection of the plastic raw material liquid when it detects a change in the negative pressure in the intake pipe. Thereafter, the adhesive tape is attached again to seal the space (cavity) in the mold.
- Patent Document 2 describes a technique related to a method for producing a cured product of plastic.
- an injection hole is provided in an adhesive tape wound around the entire periphery of a mold, and a plastic raw material liquid is injected from the injection hole.
- an ultraviolet curable resin is applied to the injection hole to seal the space in the mold.
- the injection hole provided in the pressure-sensitive adhesive tape also serves as an air exhaust port in the mold, and therefore needs to be set larger than the nozzle.
- the nozzle can increase the flow rate of the plastic raw material liquid as the cross-sectional area of the hole is increased, and can complete the filling earlier.
- the cross-sectional area of the nozzle hole and the injection hole are increased, the time required for the operation of sealing the injection hole increases accordingly.
- the plastic raw material liquid may overflow from the injection hole.
- the overflowing plastic raw material liquid may affect equipment, workers, and the like used for injection work and polymerization process.
- the present invention has been made in view of such a situation, and it is not necessary to precisely control the height of the liquid surface of the plastic raw material liquid (plastic material), and the flow rate of the plastic raw material liquid is increased. It is an object to improve productivity.
- the mold of the present invention includes a mold assembly and an injection assisting member attached to the mold assembly.
- the mold assembly includes first and second molds facing each other, a tape member connecting between the outer circumferences of the first mold and the second mold, a cavity into which a plastic lens material is injected, It has a through hole that opens partly.
- the injection assisting member is provided around the first opening, the first opening facing the through hole of the mold assembly, the second opening communicating with the first opening, and the mold assembly. And a mounting piece that is in close contact with the solid body.
- the method for producing a plastic lens of the present invention includes a mold assembling step, an auxiliary member attaching step, a through hole forming step, an injection step, a sealing step, and a polymerization step.
- the first mold and the second mold are opposed to each other, and the outer periphery of both is connected by a tape member to form a mold assembly having a cavity.
- the attachment piece provided around the first opening of the injection assisting member having the first opening and the second opening communicating with the first opening is brought into close contact with the mold assembly. The first opening is opposed to the tape member that forms the outer periphery of the cavity.
- a through-hole is provided in a portion facing the first opening of the tape member.
- a nozzle is inserted from the second opening of the injection assisting member, and a plastic lens material is injected into the cavity.
- the sealing step the second opening of the injection assisting member is sealed with the sealing member.
- the plastic lens material injected into the cavity is polymerized.
- the plastic lens material filling the cavity and overflowing from the through hole can be accumulated in the injection assisting member. Accordingly, since the plastic lens material can be prevented from leaking to the outside, there is no fear that the plastic lens material adheres to and influences equipment, workers, etc. used in the injection process and the polymerization process.
- the cavity is sealed by sealing the second opening of the injection assisting member with the sealing member. Therefore, it is not necessary to precisely control the liquid level of the plastic lens material injected into the cavity. Even if the cross-sectional area and the through hole of the nozzle are increased, the cavity can be easily sealed by sealing the injection assisting member.
- the present invention it is not necessary to precisely control the liquid level of the plastic lens material, and the productivity can be improved by increasing the flow rate of the plastic lens material.
- FIG. 1A is a perspective view of a first embodiment of a molding die according to the present invention
- FIG. 1B is a cross-sectional view of the molding die shown in FIG. 1A taken along line AA ′.
- FIG. 6A is a perspective view of a second embodiment of the molding die of the present invention
- FIG. 6B is a cross-sectional view of the molding die shown in FIG. 6A taken along line BB ′.
- FIG. 1A is a perspective view of a first embodiment of a mold
- FIG. 1B is a cross-sectional view of the mold shown in FIG. 1A taken along line AA ′.
- the mold 1 includes a mold assembly 2, an injection assisting member 3, and a sealing member 4 (see FIG. 4).
- the mold assembly 2 includes a first mold 21 and a second mold 22 that face each other at a predetermined interval, and a tape member 23 that connects between the outer peripheries of the two molds 21 and 22.
- the first mold 21 is formed in a shape having a continuous curve, such as a circle or an ellipse, or a surface surrounded by a continuous straight line and a curve, and has a lens forming surface 21a made of a concave surface.
- the second mold 22 is formed in a shape substantially equal to the first mold 21.
- the second mold 22 has a lens forming surface 22a made of a convex surface.
- the lens forming surface 22 a of the second mold 22 faces the lens forming surface 21 a of the first mold 21.
- the first and second molds 21 and 22 are formed, for example, by pouring molten glass into a mold.
- the first and second molds 21 and 22 are made of glass.
- the first and second molds according to the present invention can be made of resin or metal. Further, the first mold and the second mold may be formed using different materials.
- the tape member 23 is a so-called adhesive tape, and is wound around and pasted around the outer circumferences of the first and second molds 21 and 22.
- the width of the tape member 23 is set to a length protruding from the outer peripheral surfaces of the first and second molds 21 and 22. Therefore, the tape member 23 covers the entire outer surfaces of the first and second molds 21 and 22.
- the width of the tape member according to the present invention may be a length that seals the gap between the first and second molds 21 and 22.
- the tape member 23 includes a base material and an adhesive layer formed on one surface (adhesive surface) of the base material.
- the base material of the tape member 23 include polyester.
- the adhesive layer for example, a material that does not melt into the plastic lens material 51 (see FIG. 4) or inhibit the polymerization is preferable, and examples thereof include a silicone-based adhesive.
- the mold assembly 2 is formed with the lens forming surfaces 21 a and 22 a of the first and second molds 21 and 22 and a cavity 24 surrounded by the tape member 23.
- a plastic lens material 51 (see FIG. 4) is injected into the cavity 24.
- the tape member 23 that forms the outer periphery of the cavity 24 is provided with a through hole 25.
- FIG. 2 is a perspective view of the injection assisting member 3.
- the injection assisting member 3 is formed, for example, by injection molding a thermoplastic resin that is easy to process, such as polypropylene or polyethylene.
- the injection assisting member 3 includes an auxiliary member main body 31 formed in a substantially quadrangular cylindrical shape, and an attachment piece 32 continuous to one end of the auxiliary member main body 31.
- the auxiliary member main body 31 includes a first opening 33 and a second opening 34 that faces the first opening 33.
- the 1st opening part 33 is formed in the elongate substantially rectangular shape, and the 2nd opening part 34 is formed in the substantially rectangular shape (refer FIG. 2).
- the opening area of the first opening 33 is set smaller than the opening area of the second opening 34.
- the auxiliary member main body 31 includes a guide plate portion 35, a flat plate portion 36 that faces the guide plate portion 35, an inclined plate portion 37 that continues to the flat plate portion 36, and two side plate portions 38 and 39. ing.
- the guide plate portion 35 forms one side of the first opening 33 and the second opening 34, and has a plane parallel to the direction in which both the openings 33 and 34 are opened.
- the plane of the guide plate portion 35 serves as a guide surface for guiding the nozzle 101 (see FIG. 4).
- the flat plate portion 36 forms one side of the second opening 34 and has a plane parallel to the plane of the guide plate portion 35.
- the inclined plate portion 37 forms one side of the first opening portion 33 and is inclined with respect to the direction in which the first opening portion 33 and the second opening portion 34 are opened. Thereby, the internal space 31a of the auxiliary member main body 31 becomes narrower as it reaches the first opening 33 side (see FIG. 2).
- the two side plate portions 38 and 39 are respectively continuous with the guide plate portion 35, the flat plate portion 36, and the inclined plate portion 37, and form two sides of the first opening portion 33 and the second opening portion 34. .
- a fixed piece 41 is provided on the peripheral edge of the second opening 34.
- the fixed piece 41 is formed in a rectangular frame shape continuously with the guide plate portion 35, the flat plate portion 36, and the two side plate portions 38 and 39 (see FIG. 1).
- the sealing member 4 is closely fixed to the fixing piece 41.
- the mounting piece 32 is provided in the peripheral part of the 1st opening part 33, and is formed in the substantially rectangular frame shape.
- the mounting piece 32 is curved in an arc shape and has a curved surface 32 a corresponding to the outer peripheral surface of the mold assembly 2. That is, the curvature radius of the curved surface 32 a of the mounting piece 32 is set to be substantially equal to the curvature radius of the outer peripheral surface of the mold assembly 2.
- the injection assisting member 3 is attached to the mold assembly 2 by fixing the curved surface 32 a of the attachment piece 32 to the outer peripheral surface of the mold assembly 2.
- FIG. 2 is a perspective view of the adhesive member 45.
- the adhesive member 45 is a double-sided adhesive tape for fixing the curved surface 32 a of the mounting piece 32 to the outer peripheral surface of the mold assembly 2.
- the adhesive member 45 is formed in a rectangular sheet shape having a size substantially equal to that of the mounting piece 32, and has a through hole 45a.
- the through hole 45 a of the adhesive member 45 faces the first opening 33 of the injection assisting member 3.
- the adhesive member 45 has a polyethylene base material and an adhesive layer made of an acrylic adhesive.
- a base material for the adhesive member 45 polyester, cloth, or the like may be used.
- the adhesive layer a material that does not dissolve into the plastic lens material 51 (see FIG. 4) or inhibit the polymerization may be used, and a rubber-based adhesive may be used in addition to the silicone-based material.
- a double-sided adhesive tape is used as the adhesive member.
- a normal temperature curable adhesive a heat curable adhesive, an ultraviolet curable adhesive, a hot curable adhesive, as long as the adhesive member does not lose its adhesiveness by dissolving in the plastic lens material 51 (see FIG. 4)
- a melt adhesive or the like may be used as the adhesive member.
- the sealing member 4 (see FIG. 4) is formed in a sheet shape having a size that covers the second opening 34 and the fixing piece 41 of the auxiliary member main body 31.
- the sealing member 4 is fixed in close contact with the fixing piece 41 using a heat sealing method or an adhesive.
- FIG. 4 is an explanatory view for explaining a method for producing a plastic lens of the present invention.
- a mold assembly process In the plastic lens manufacturing method performed using the mold 1, a mold assembly process, an auxiliary member attaching process, a through hole forming process, an injection process, a sealing process, and a polymerization process are performed.
- the mold assembly process will be described with reference to FIG.
- the first mold 21 and the second mold 22 are opposed to each other with a predetermined interval, and the outer periphery of both is connected by the tape member 23.
- the mold assembly 2 is assembled.
- lens forming surfaces 21 a and 22 a of the first and second molds 21 and 22 and a cavity 24 sealed by a tape member 23 are formed.
- the auxiliary member attaching step will be described with reference to FIG.
- the injection auxiliary member 3 is attached to the mold assembly 2. That is, the curved surface 32 a of the mounting piece 32 provided on the injection assisting member 3 is fixed to the outer peripheral surface of the mold assembly 2 by the adhesive member 45.
- the curved surface 32a of the mounting piece 32 is set to a curvature radius (substantially the same) corresponding to the outer peripheral surface of the mold assembly 2. Therefore, the curved surface 32 a of the mounting piece 32 can be securely adhered to the outer peripheral surface of the mold assembly 2.
- the first opening 33 of the injection assisting member 3 is opposed to the outer periphery of the cavity 24 formed in the mold assembly 2 via the tape member 23. Further, the first opening 33 is disposed on the lens forming surface 22 a side of the second mold 22. That is, when the injection assisting member 3 is attached to the mold assembly 2, the first opening 33 is opposed to the outer periphery of the cavity 24, and the extension line of the first opening 33 forms the lens of the second mold 22. Intersects surface 22a.
- the through hole forming step will be described with reference to FIG.
- the through hole 25 is provided in a portion of the tape member 23 that faces the first opening 33.
- the internal space 31 a and the cavity 24 of the injection assisting member 3 are communicated with each other through the through hole 25 and the first opening 33.
- the through hole 25 is provided by inserting a tool through the second opening 34 of the injection assisting member 3 and cutting the tape member 23 along the first opening 33.
- the tape member 23 may be processed using a method such as a laser to provide the through hole 25.
- a method such as a laser to provide the through hole 25.
- thermosetting resin composition that is polymerized and cured by heat is used as the plastic lens material 51.
- bisisocyanatomethylbicycloheptane, 1-mercapto-2,3-bismercaptoethylthiopropane, and pentaerythritol tetrakismercaptopropionate are mixed as plastic lens material 51, and dibutyltin is used as a polymerization catalyst.
- a monomer using dichloride is used.
- thermosetting resin composition As the plastic lens material 51 according to the present invention, in addition to the thermosetting resin composition as described above, a photocurable resin composition that is polymerized and cured by light such as ultraviolet rays can be used.
- the photocurable resin composition contains a photocurable monomer and a photopolymerization initiator.
- the nozzle 101 inserted from the second opening 34 is guided along the guide plate portion 35 of the injection assisting member 3, and the tip 101 a passes through the through hole 25 and is inserted into the cavity 24. Then, the plastic lens material 51 is discharged from the nozzle 101.
- the plastic lens material 51 discharged from the nozzle 101 first fills the cavity 24 along the lens forming surface 22a of the second mold 22. Therefore, it is possible to suppress the generation of bubbles in the plastic lens material 51 filled in the cavity 24.
- the plastic lens material 51 fills the cavity 24 and overflows from the through hole 25 to the internal space 31 a of the injection assisting member 3.
- the plastic lens material 51 is injected until an appropriate amount of the plastic lens material 51 is accumulated in the internal space 31a of the injection assisting member 3 (see FIG. 4E).
- the nozzle 101 is pulled out from the injection assisting member 3.
- the sealing member 4 is brought into close contact with the fixing piece 41 and fixed by a heat sealing method. Thereby, the internal space 31a of the injection assisting member 3 communicating with the cavity 24 and the cavity 24 is sealed. In this sealing step, since the sealing member 4 does not touch the plastic lens material 51, the second opening 34 can be reliably sealed without being affected by the plastic lens material 51.
- the plastic lens material 51 does not fill the internal space 31 a of the injection assisting member 3. Therefore, the 2nd opening part 34 can be easily sealed with the sealing member 4, and workability
- the appropriate amount of the plastic lens material 51 described above is determined according to the posture of the mold in the polymerization step described later, and is an amount that the liquid surface of the plastic lens material 51 completely fills the through hole 25.
- the mold 1 filled with the plastic lens material 51 is placed in a heating furnace (not shown) and polymerized. Thereby, the plastic lens material 51 is cured, and a plastic lens (not shown) is formed.
- the temperature in the heating furnace was raised to 120 ° C. over about 20 hours, but the sealing of the internal space 31a and the cavity 24 of the injection assisting member 3 sealed by the sealing member 4 was impaired. There was no.
- the plastic lens material is polymerized by irradiating the plastic lens material with light such as ultraviolet rays and visible rays.
- the cured plastic lens material 51 is released and the plastic lens is taken out.
- the extracted plastic lens is, for example, a finished lens or a semi-finished lens.
- Finished lens has both optical surfaces completed at the time of molding.
- the semi-finished lens one optical surface is completed at the time of molding, and the other surface is individually cut to a corresponding frequency by an order or the like.
- This semi-finished lens can be used for special lenses such as progressive addition lenses and prism prescription lenses.
- the plastic lens material 51 that fills the cavity 24 and overflows from the through hole 25 can be stored in the internal space 31 a of the injection assisting member 3. Therefore, it is not necessary to precisely control the liquid level of the plastic lens material injected into the cavity.
- the plastic lens material 51 is prevented from leaking outside the mold 1 in the injection process of the plastic lens material 51. Thereby, there is no fear that the plastic lens material 51 adheres to equipment, workers, etc. used in the injection process and the polymerization process.
- the second opening 34 of the injection assisting member 3 is sealed by the sealing member 4. Therefore, even if the sectional area of the hole of the nozzle 101 and the through hole 25 are increased, the operation of sealing the injection assisting member 3 is not complicated, and the cavity 24 can be easily sealed. Therefore, productivity can be improved by increasing the flow rate of the plastic material.
- the plastic lens material 51 discharged from the nozzle 101 is filled in the cavity 24 along the lens forming surface 22 a of the second mold 22. Thereby, it can suppress that a bubble arises in the plastic lens material 51 with which the cavity 24 was filled.
- the radius of curvature of the curved surface 32 a of the mounting piece 32 provided on the injection assisting member 3 is made substantially equal to the radius of curvature of the outer peripheral surface of the mold assembly 2. Therefore, the curved surface 32 a of the mounting piece 32 can be brought into close contact with the outer peripheral surface of the mold assembly 2. As a result, the internal space 31a and the cavity 24 of the injection assisting member 3 can be reliably sealed.
- the second opening 34 is larger than the first opening 33. Therefore, the nozzle 101 can be easily inserted into the injection assisting member 3.
- the first opening 33 is formed in an elongated and substantially rectangular shape, the first opening 33 can be opposed to the outer periphery of the cavity even when a plastic lens having a thin outer peripheral portion is formed. it can.
- the second opening 34 can be formed larger with respect to the nozzle 101, it is not necessary to control the position of the nozzle 101 and the mold 1 in the insertion work with high accuracy, and the nozzle 101 is inserted into the injection assisting member 3. Work can be simplified.
- the inner space 31a of the injection assisting member 3 becomes narrower as it reaches the first opening 33 side.
- the guide plate portion 35 forms one side of the first opening 33 and the second opening 34 and has a plane parallel to the direction in which the openings 33 and 34 are opened.
- the inclined plate portion 37 forms one side of the first opening portion 33 and is inclined with respect to the direction in which both the opening portions 33 and 34 are opened.
- the gas (air) in the internal space 31 a does not enter the cavity 24.
- the tip end portion 101 a of the nozzle 101 can be easily inserted into the cavity 24.
- the second opening 34 of the injection assisting member 3 is sealed by the sealing member 4.
- the second opening of the injection assisting member according to the present invention can be sealed by welding the injection assisting member itself with ultrasonic waves or the like. In that case, the injection assisting member also serves as the sealing member.
- the second opening When the second opening is sealed by welding the injection assisting member itself with ultrasonic waves or the like, the second opening may be formed into two independent tube-shaped holes.
- One of the two tubular holes is an insertion hole for inserting a nozzle, and the other hole is a discharge hole for discharging the air in the internal space 31a.
- the opening area of a 2nd opening part can be made small, and welding can be performed easily.
- FIG. 6A is a perspective view of a second embodiment of the mold
- FIG. 6B is a cross-sectional view of the mold shown in FIG. 6A taken along line BB ′.
- the molding die 61 of the second embodiment has the same configuration as the molding die 1 (see FIG. 1) of the first embodiment, and the only difference is the mold assembly 62. Therefore, as for the mold 61, only the mold assembly 62 will be described, and the same reference numerals will be given to portions common to the mold 1, and redundant description will be omitted.
- the tape member 63 is the same adhesive tape as the tape member 23, and is affixed to the outer periphery of the first and second molds 21 and 22.
- the length (longitudinal direction) of the tape member 63 is set to be shorter than the outer peripheral lengths of the first and second molds 21 and 22. Therefore, a cavity 64 and an injection opening 65 that opens the cavity 64 are formed in the mold assembly 62.
- the injection opening 65 of the mold assembly 62 is set smaller than the curved surface 32 a of the attachment piece 32 provided in the injection assisting member 3.
- the injection assisting member 3 is attached to the periphery of the injection opening 65 formed in the mold assembly 62. That is, the attachment piece 32 of the injection assisting member 3 is fixed to the outer peripheral surfaces of the first and second molds 21 and 22 by the adhesive member 45.
- the injection opening 65 is covered with the attachment piece 32 of the injection assisting member 3.
- the cavity 64 of the mold assembly 62 and the internal space 31 a of the injection assisting member 3 are communicated with each other through the first opening 33.
- the first mold 21 and the second mold 22 are opposed to each other with a predetermined interval, and the outer periphery of both is connected by the tape member 63.
- the mold assembly 62 having the cavity 64 provided with the injection opening 65 is assembled.
- the tape member is cut and an injection opening is formed. You may make it provide. Moreover, you may make it connect the 1st and 2nd molds 21 and 22 with the tape member by which the opening part for injection
- the injection auxiliary member 3 is attached to the mold assembly 62.
- the injection opening 65 is covered with the attachment piece 32, and the cavity 64 and the inner space 31a of the injection assisting member 3 are communicated with each other.
- the same effects as the plastic lens manufacturing method and the mold 1 according to the first embodiment can be obtained. And since the through-hole formation process can be skipped, the work efficiency can be improved.
- the injection opening 65 is formed in the mold assembly 62 by making the length of the tape member 63 shorter than the length of the outer periphery of the first and second molds 21 and 22.
- the injection opening according to the present invention may be provided in advance in the tape member. In that case, the length of the tape member is set longer than the outer peripheries of the first and second molds 21 and 22.
- FIG. 7 is a cross-sectional view of an injection assisting member according to the third embodiment of the mold.
- the molding die of the third embodiment has the same configuration as that of the molding die 1 (see FIG. 1) of the first embodiment, and the only difference is the injection assisting member 73. Therefore, the injection assisting member 73 will be described with respect to the mold according to the third embodiment.
- the injection assisting member 73 is formed by injection-molding a thermoplastic resin, and an auxiliary member main body 81 formed in a substantially square cylindrical shape, An attachment piece 32 is provided at one end of the auxiliary member main body 81.
- the attachment piece 32 is the same as the attachment piece 32 according to the injection assisting member 3 of the first embodiment.
- the guide plate portion 85 forms one side of the first opening 83 and the second opening 84.
- the inner surface of the guide plate 85 is formed between the tapered guide surface 85a on the first opening 83 side, the inclined surface 85b on the second opening 84 side, and the tapered guide surface 85a and the inclined surface 85b.
- the taper guide surface 85a is a curved surface that continuously reduces the internal space 81a of the auxiliary member body 81 toward the first opening 83, and has a substantially arcuate cross-sectional shape.
- the taper guide surface 85a serves as a guide surface for guiding the nozzle 101 (see FIG. 4) to the first opening 83.
- the inclined surface 85 b is inclined in a direction away from the flat plate portion 86, and continuously increases the internal space 81 a of the auxiliary member main body 81 toward the second opening 84. Further, the plane 85c is parallel to the direction in which both the openings 83 and 84 are opened.
- the flat plate portion 86 forms one side of the second opening portion 84 and has an inner surface parallel to the flat surface 85c of the guide plate portion 85.
- the inclined plate portion 87 forms one side of the first opening 83 and is inclined with respect to the direction in which both the openings 83 and 84 are opened. As a result, the internal space 81 a of the auxiliary member body 81 becomes narrower toward the first opening 83.
- the inclined plate portion 87 has a taper guide surface 87 a that continuously reduces the internal space 81 a of the auxiliary member main body 81 as it goes toward the first opening 83.
- the taper guide surface 87 a serves as a guide surface that guides the nozzle 101 to the first opening 83.
- the two side surface plate portions 88 are respectively connected to the guide plate portion 85, the flat plate portion 86, and the inclined plate portion 87, and form two sides of the first opening portion 83 and the second opening portion 84.
- a fixing piece 41 is provided on the peripheral edge of the second opening 84.
- the fixed piece 41 is formed in a rectangular frame shape that continues to the guide plate portion 85, the flat plate portion 86, and the two side surface plate portions 88.
- the sealing member 4 (see FIG. 5) is fixed to the fixing piece 41 in close contact.
- the inner space 81a of the injection assisting member 73 has an asymmetric shape in the direction in which the guide plate portion 85 and the flat plate portion 86 face each other about the axis of the first opening 83.
- the same effects as those of the mold 1 according to the first embodiment can be obtained.
- the taper guide surface 85a and the inclined surface 85b are provided on the auxiliary member main body 81, in order to ensure the rigidity of the nozzle 101, for example, the root that is crushed only at the tip of the cylinder is thick, and the tip is narrowed stepwise. Even if it is the shape which becomes, the nozzle 101 can be inserted vertically. As a result, when the nozzle is obliquely inserted into the first opening 83, it is possible to prevent the auxiliary member main body 81 from being peeled off when a pressing force is applied to the first opening 83 or the mounting piece 32.
- the lens forming surface 21a of the first mold 21 is a concave surface
- the lens forming surface 22a of the second mold 22 is a convex surface.
- the lens forming surface according to the present invention can be appropriately set according to the shape of the plastic lens to be formed.
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- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
[成形型]
まず、本発明の成形型の第1の実施の形態について、図1を参照して説明する。
成形型1は、モールド組立体2と、注入補助部材3と、封止部材4(図4参照)とを備えている。
[モールド組立体]
モールド組立体2は、所定の間隔をあけて対向する第1のモールド21及び第2のモールド22と、これら2つのモールド21,22の外周間を連結するテープ部材23からなっている。
次に、注入補助部材3について、図2を参照して説明する。
図2は、注入補助部材3の斜視図である。
次に、接着部材45について、図2を参照して説明する。
図2は、接着部材45の斜視図である。
次に、封止部材4について説明する。
封止部材4(図4参照)は、補助部材本体31の第2の開口部34及び固定片41を覆う大きさのシート状に形成されている。この封止部材4は、ヒートシール方法又は接着剤等を用いて固定片41に密着して固定される。
次に、成形型1を用いて行われる本発明のプラスチックレンズの製造方法について、図4を参照して説明する。
図4は、本発明のプラスチックレンズの製造方法を説明する説明図である。
まず、モールド組立工程について、図4(a)を参照して説明する。
モールド組立工程では、第1のモールド21と第2のモールド22を所定の間隔をあけて対向させ、両者の外周間をテープ部材23によって連結する。これにより、モールド組立体2が組み立てられる。このモールド組立体2には、第1及び第2のモールド21,22のレンズ形成面21a,22aと、テープ部材23によって密閉されたキャビティ24が形成される。
次に、補助部材取付工程について、図4(b)を参照して説明する。
補助部材取付工程では、注入補助部材3をモールド組立体2に取り付ける。つまり、注入補助部材3に設けた取付片32の曲面32aを、モールド組立体2の外周面に接着部材45によって密着させて固定する。
次に、貫通孔形成工程について、図4(c)を参照して説明する。
貫通孔形成工程では、テープ部材23の第1の開口部33に対向する部分に貫通孔25を設ける。これにより、注入補助部材3の内部空間31aとキャビティ24が、貫通孔25及び第1の開口部33を介して連通される。
次に、注入工程について、図4(d)を参照して説明する。
注入工程では、注入補助部材3の第2の開口部34からノズル101を挿入し、キャビティ24にプラスチックレンズ材料51を注入する。
次に、封止工程について、図4(e)を参照して説明する。
封止工程では、注入補助部材3の第2の開口部34を封止部材4によって封止する。
図5に示すように、封止工程を終えた成形型1は、注入補助部材3のガイド板部35を下方に向けて載置することができる。
次に、重合工程について説明する。
重合工程では、キャビティ24に注入したプラスチックレンズ材料51を重合させる。
[成形型]
次に、本発明の成形型の第2の実施の形態について、図6を参照して説明する。
図6(a)は、成形型の第2の実施の形態の斜視図、図6(b)は、図6(a)に示す成形型をB-B′線で断面した断面図である。
モールド組立体62は、所定の間隔をあけて対向する第1のモールド21及び第2のモールド22と、これら2つのモールド21,22の外周間を連結するテープ部材63からなっている。2つのモールド21,22は、成形型1(図1参照)と同じ形状、材質であるため、説明を省略する。
次に、成形型61を用いて行われるプラスチックレンズの製造方法について説明する。
本実施の形態に係る製造方法では、モールド組立工程と、補助部材取付工程と、注入工程と、封止工程と、重合工程が行われる。つまり、本実施の形態に係る製造方法では、成形型1を用いて行われるプラスチックレンズの製造方法における貫通孔形成工程が省略される。
[成形型]
次に、本発明の成形型の第3の実施の形態について、図7を参照して説明する。
図7は、成形型の第3の実施の形態に係る注入補助部材の断面図である。
Claims (4)
- 対向する第1のモールド及び第2のモールドと、前記第1のモールド及び前記第2のモールドの外周間を連結するテープ部材からなり、プラスチックレンズ材料が注入されるキャビティと、前記キャビティの一部を開口する貫通孔を有するモールド組立体と、
前記モールド組立体に取り付けられる注入補助部材と、を備え、
前記注入補助部材は、前記モールド組立体の前記貫通孔に対向する第1の開口部と、前記第1の開口部に連通する第2の開口部と、前記第1の開口部の周囲に設けられていて前記モールド組立体に密着する取付片とを有する成形型。 - 前記取付片は、前記モールド組立体の取付面に対して、沿うように撓み変形可能に形成されている
請求項1に記載の成形型。 - 第1のモールドと第2のモールドを対向させ、前記第1のモールド及び前記第2のモールドの外周間をテープ部材によって連結し、キャビティを有するモールド組立体を組み立てるモールド組立工程と、
第1の開口部及び前記第1の開口部に連通する第2の開口部を有する注入補助部材の前記第1の開口部の周囲に設けられた取付片を前記モールド組立体に密着させて取り付け、前記キャビティの外周を形成する前記テープ部材に前記第1の開口部を対向させる補助部材取付工程と、
前記テープ部材の前記第1の開口部に対向する部分に貫通孔を設ける貫通孔形成工程と、
前記注入補助部材の前記第2の開口部からノズルを挿入し、前記キャビティにプラスチックレンズ材料を注入する注入工程と、
前記注入補助部材の前記第2の開口部を封止部材によって封止する封止工程と、
前記キャビティに注入したプラスチックレンズ材料を重合させる重合工程と、
を有するプラスチックレンズの製造方法。 - 第1のモールドと第2のモールドを対向させ、前記第1のモールド及び前記第2のモールドの外周間をテープ部材によって連結し、注入用開口部が設けられたキャビティを有するモールド組立体を組み立てるモールド組立工程と、
第1の開口部及び該第1の開口部に連通する第2の開口部を有する注入補助部材の前記第1の開口部の周囲に設けられた取付片を前記モールド組立体に密着させて取り付け、前記注入用開口部に前記第1の開口部を対向させる補助部材取付工程と、
前記注入補助部材の前記第2の開口部からノズルを挿入し、前記キャビティにプラスチックレンズ材料を注入する注入工程と、
前記注入補助部材の前記第2の開口部を封止部材によって封止する封止工程と、
前記キャビティに注入したプラスチックレンズ材料を重合させる重合工程と、
を有するプラスチックレンズの製造方法。
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EP10746345.7A EP2402135A4 (en) | 2009-02-27 | 2010-02-26 | MOLD AND METHOD FOR PRODUCING A LENS OF PLASTIC MATERIAL |
US13/203,619 US9067344B2 (en) | 2009-02-27 | 2010-02-26 | Mold and method for producing plastic lens |
CN2010800093754A CN102333628A (zh) | 2009-02-27 | 2010-02-26 | 模具和用于制造塑料透镜的方法 |
JP2011501680A JPWO2010098466A1 (ja) | 2009-02-27 | 2010-02-26 | 成形型およびプラスチックレンズの製造方法 |
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Cited By (2)
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JP2012115998A (ja) * | 2010-11-29 | 2012-06-21 | Hoya Corp | 成形型およびプラスチックレンズの製造方法 |
US9453000B2 (en) | 2007-08-31 | 2016-09-27 | Eisai R&D Management Co., Ltd. | Polycyclic compound |
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KR102166475B1 (ko) * | 2017-12-14 | 2020-10-16 | 주식회사 엘지화학 | 배터리 모듈의 제조 방법 |
CN111531770B (zh) * | 2020-03-31 | 2021-11-19 | 厦门晶华视康医疗器械有限公司 | 一种透镜成型的模具 |
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