WO2014045891A1 - 成形金型、光学素子の製造方法、及び光学素子 - Google Patents
成形金型、光学素子の製造方法、及び光学素子 Download PDFInfo
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- WO2014045891A1 WO2014045891A1 PCT/JP2013/073984 JP2013073984W WO2014045891A1 WO 2014045891 A1 WO2014045891 A1 WO 2014045891A1 JP 2013073984 W JP2013073984 W JP 2013073984W WO 2014045891 A1 WO2014045891 A1 WO 2014045891A1
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- Prior art keywords
- gate
- outer peripheral
- mold
- forming
- transfer surface
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- 230000003287 optical effect Effects 0.000 title claims abstract description 118
- 238000000465 moulding Methods 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 230000013011 mating Effects 0.000 claims abstract description 5
- 230000002093 peripheral effect Effects 0.000 claims description 114
- 230000015572 biosynthetic process Effects 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 11
- 238000005452 bending Methods 0.000 abstract description 7
- 239000011347 resin Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/38—Cutting-off equipment for sprues or ingates
-
- 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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
- B29C45/401—Ejector pin constructions or mountings
-
- 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 molding die for molding a minute optical element, an optical element manufacturing method using the molding die, and an optical element manufactured using the molding die.
- Patent Document 1 it is difficult to secure a space for providing an ejector pin when the product portion is very small. Moreover, even if it is the structure which protrudes the core part which forms a product part, there exists a limit in making a core part thin or small according to a product part, and a process is difficult. Moreover, even if such a core part can be processed, the rigidity of the core part cannot be ensured, and it is difficult to mold the product part with good reproducibility.
- the thickness of the flange portion and the thickness of the gate portion are the same, and the molding surfaces forming the flange portion and the gate portion are the same plane.
- the shape of the gate portion so as to be suitable for mold release.
- the rigidity of the gate part can be secured by making the thickness of the gate part the same as the thickness of the flange part. Further, by making the molding surfaces of the flange portion and the gate portion on the fixed mold side the same plane, there is no notch shape that may cause a crack at the time of mold release.
- the gate thickness is increased to connect the gate part to the runner part. The part that has begun to change is bent. Thereby, a crack occurs in the gate portion, the gate portion is broken, and it may be difficult to take out the product portion.
- the shape of the gate portion of Patent Document 3 is wider than the product portion, and it becomes difficult to cut the gate along the outer shape of the product portion. That is, even if the gate is cut, a part of the gate part is often left large, and when the product part is assembled to a holder or the like, the restriction on the relief shape of the gate part on the holder side becomes large.
- Patent Document 4 when projecting a molded product, there is a method of projecting a product part in a direction perpendicular to the parting surface and projecting a runner part in an oblique direction with respect to a direction perpendicular to the parting surface (for example, Patent Document 4). reference).
- a runner portion is protruded along an inclined gate portion, and the product portion and the gate portion are cut.
- the runner part is projected obliquely without providing a mechanism for projecting the product part.
- the outer peripheral part of the product part may be caught by the mold, and the gate part may be bent and broken.
- the present invention prevents the gate portion associated with the optical element from being bent or broken, and allows a fine optical element with good surface accuracy. It is an object to provide a molding die that can be easily released.
- Another object of the present invention is to provide an optical element manufacturing method using the molding die and an optical element manufactured using the molding die.
- a molding die includes a fixed die that forms a first optical surface of an optical element and a first outer peripheral surface extending around the first optical surface, and a first mold of the optical element.
- a molding die comprising two optical surfaces, a second outer peripheral surface extending around the second optical surface, and a movable die forming an outer peripheral side surface connecting the first outer peripheral surface and the second outer peripheral surface,
- the fixed mold forms a first optical transfer surface that forms a first optical surface, a first outer peripheral transfer surface that forms a first outer peripheral surface, a first gate formation surface that forms a gate portion, and a flow path portion.
- the movable mold has a second optical transfer surface that forms a second optical surface, a second outer peripheral transfer surface that forms a second outer peripheral surface, and a side surface that forms an outer peripheral side surface.
- a pair of surfaces parallel to the mold-mating surfaces of the fixed mold and the movable mold, the first outer peripheral transfer surface and the first gate forming surface are on the same plane, and the fixed mold and the movable mold are: An outer periphery forming portion including first and second outer peripheral transfer surfaces and a side transfer surface; and a gate forming portion including first and second gate forming surfaces.
- the portion connecting the two has an R shape in a cross section parallel to the die-matching surface, the side transfer surface has a taper angle that narrows on the second outer peripheral transfer surface side, and the movable mold protrudes the flow path portion of the optical element.
- the protrusion mechanism has an protrusion pin that protrudes toward the first flow path formation surface side of the movable mold at the same angle as the taper angle of the surface on the second gate formation surface side of the side transfer surface.
- the flow path part is a molding part excluding the base gate part of the optical element formed by the part that supplies the resin through the gate formation part in the mold space that forms the optical element,
- a support shaft portion provided between the runner portion and the gate portion is also included.
- the first outer peripheral transfer surface of the fixed mold and the first gate forming surface are the same plane, so that a notch shape is formed between the outer peripheral portion on the fixed mold side of the molded product and the gate portion. Alternatively, no step is formed.
- the part which connects an outer periphery formation part and a gate formation part is R shape, it can prevent that stress concentrates on the part which connects an outer periphery part and a gate part at the time of mold release of a molded article. Thereby, it can prevent that the gate part of a molded product bends or a fracture
- the flow path portion by projecting the flow path portion at the same angle as the taper angle of the side transfer surface on the second gate forming surface side, it is possible to prevent bending deformation of the gate portion that may occur when projecting in the direction perpendicular to the die-matching surface. it can. Thereby, it is possible to prevent the outer peripheral portion of the optical element from being caught at the portion on the fixed mold side in the outer peripheral forming portion on the side opposite to the gate forming portion (on the opposite gate side), which is particularly likely to cause mold release inhibition.
- the side transfer surface has a taper angle, even if only the flow path portion protrudes in an oblique direction, the outer peripheral side surface is not caught by the mold, and the optical element can be easily released from the mold.
- the second outer peripheral transfer surface and the second gate forming surface are at least an extension perpendicular to the mold-matching surface of the portion connecting the first outer peripheral transfer surface and the first gate forming surface. They are on the same plane up to the line or plane, and the depth of the outer periphery forming portion and the depth of at least the connecting portion of the gate forming portions are the same.
- the outer peripheral portion to be molded and the gate portion have the same thickness at least at the connecting portion, and the rigidity of the gate portion can be ensured. Accordingly, the optical element can be released from the mold in a state where the surface accuracy of the optical element is good without directly projecting the optical element as the product portion.
- the gate surface formed by the second gate forming surface is formed by the second outer peripheral transfer surface. It is possible to prevent the outer peripheral surface from protruding from the extension.
- the gate forming portion increases in depth and / or width as it goes from the outer periphery forming portion side to the flow passage forming portion side constituted by the flow passage forming surface in the movable mold.
- the portion connecting the gate forming portion and the flow path forming portion has an R shape in a cross section perpendicular to the die-matching surface. In this case, the thickness of the gate part to be molded can be secured and the rigidity of the gate part can be improved.
- the ridge portion on the second outer peripheral surface side of the outer peripheral forming portion has an R shape in a cross section perpendicular to the mold matching surface (surface along the resin flow direction). In this case, it is possible to further prevent the outer peripheral portion of the optical element from being caught by the movable mold at the time of mold release.
- the gate forming portion extends outward from the second outer peripheral transfer surface and is parallel to the mold transfer surface, and extends outward from the first transfer surface to the first transfer surface.
- the portion having the second transfer surface inclined with respect to the first transfer surface and the second transfer surface has an R shape in a cross section perpendicular to the die-matching surface.
- the following conditional expression is satisfied when the taper angle of the side transfer surface is ⁇ . 0.1 ° ⁇ ⁇ ⁇ 10 °
- an optical element manufacturing method includes a molding step of molding a molded product using the molding die described above, and a gate forming surface side of a side transfer surface using a protrusion mechanism.
- the optical element can be extended in a state where the surface shape of the optical element is good without causing bending or breaking of the gate portion. Can be easily released.
- the optical element according to the present invention is manufactured using the above-described molding die.
- the first outer peripheral surface and the gate surface are the same plane, so that a notch shape is not formed at the connecting portion.
- the part which connects an outer peripheral part and a gate part is R shape, it can prevent that a stress concentrates on the said connection part at the time of mold release. Thereby, it can prevent that a gate part bends or a fracture
- the outer peripheral side surface has a taper angle, the outer peripheral side surface is not caught by the mold even when only the flow path portion protrudes in an oblique direction, and an optical element that can be easily released from the mold can be obtained.
- FIG. 1A is a side view of the optical element according to the first embodiment
- FIG. 1B is a plan view of the optical element side of the optical element in FIG. 1A
- FIG. 1C is a first view of the optical element in FIG. 1A
- FIG. 1D is a plan view of the second optical surface side
- FIG. 1D is a diagram illustrating an end surface on the gate portion side.
- 2A is an enlarged side view of a molded product molded by the molding die according to the first embodiment
- FIG. 2B is a plan view of the first optical surface side of the molded product of FIG. 2A
- FIG. FIG. 2B is a plan view of the molded product in FIG. 2A on the second optical surface side.
- FIG. 4A is a partially enlarged cross-sectional view of the molding die of FIG. 3
- FIG. 4B is a plan view of the molding die of FIG. 4A on the first optical transfer surface side
- FIG. 4C is the molding die of FIG. 4A. It is a top view by the side of the 2nd optical transfer surface of a type
- FIG. 5A is a conceptual diagram illustrating a state in which the molded product is released from the fixed mold
- FIG. 5B is a conceptual diagram illustrating a state in which the molded product is being released from the movable mold.
- FIGS. 6A and 6B are diagrams illustrating a molding die for molding the optical element according to the second embodiment
- FIG. 6C is a molded product molded using the molding die of FIGS. 6A and 6B.
- 7A and 7B are diagrams illustrating a molding die for molding the optical element according to the third embodiment
- FIG. 7C is a molded product molded using the molding die of FIGS. 7A and 7B.
- 8A and 8B are diagrams illustrating a molded product including the optical element according to the fourth embodiment
- FIG. 8C is a diagram illustrating a molding die for molding the optical element of FIGS. 8A and 8B.
- 9A and 9B are diagrams illustrating a modification of the optical element.
- the lens OP which is an optical element, is a resin-made small lens, for example, used as an objective lens (specifically, a BD (Blu-ray Disc) trademark) lens or an endoscope lens of an optical pickup device. It is done.
- the lens OP is obtained by cutting the gate part GP in the molded product MP shown in FIGS. 2A to 2C.
- the lens OP has an optical part OL having an optical function and an annular outer peripheral part FL extending from the optical part OL in the outer diameter direction.
- the optical part OL has a convex first optical surface OL1 and a convex second optical surface OL2. That is, the optical part OL is thick on the center side.
- the first optical surface OL1 and the second optical surface OL2 are smooth as a whole, and face each other with a light-transmitting main body (center of the lens OP) interposed therebetween.
- the outer peripheral portion FL includes a first outer peripheral surface FL1 on the first optical surface OL1 side, a second outer peripheral surface FL2 on the second optical surface OL2 side, and an outer peripheral side surface FL3 connecting the first and second outer peripheral surfaces FL1 and FL2.
- the first and second outer peripheral surfaces FL1 and FL2 are annular surfaces parallel to each other and extending perpendicularly to the optical axis OA. That is, the first and second outer peripheral surfaces FL1 and FL2 are a pair of opposed surfaces perpendicular to the optical axis OA.
- the outer peripheral portion FL becomes a reference when the lens OP is assembled, for example, by the first outer peripheral surface FL1.
- the outer peripheral side surface FL3 is a cylindrical surface FL3a having a taper angle ⁇ narrowing on the second outer peripheral surface FL2 side with respect to the optical axis OA as a whole, but at the B direction (right side in the AB direction) or the X direction end. It has a flat rectangular end face EF parallel to the optical axis OA.
- the taper angle ⁇ of the cylindrical surface FL3a of the outer peripheral surface FL3 is in the range of 0.1 ° ⁇ ⁇ ⁇ 10 °.
- the ridge portion R1 on the second outer peripheral surface FL2 side of the outer peripheral portion FL has an R shape in a cross section parallel to the optical axis OA (more specifically, a cross section passing through the optical axis OA).
- the ridge portion R1 of the outer peripheral portion FL is a boundary portion between the second outer peripheral surface FL2 and the outer peripheral side surface FL3.
- R shape means that a corner
- the lens OP is cut parallel to the optical axis OA in a state where the gate portion GP is not substantially left with reference to the outer diameter of the second outer peripheral surface FL2.
- a portion such as the corner portion CO1 attached to the end surface EF on the second optical surface OL2 side can also be regarded as a removal trace of the gate portion GP.
- one molded product MP has one or more runners RP corresponding to the number of lenses OP (only one is shown in the drawing for simplification). It has one or more gate parts GP and one or more lenses OP.
- the gate part GP is connected to the runner part RP, and the lens OP which is a product part is connected to the gate part GP before cutting the molded product MP.
- the gate portion GP and the like are removed by finishing.
- the gate portion GP has a first gate surface GL1 on the first outer peripheral surface FL1 side, a second gate surface GL2 on the second outer peripheral surface FL2 side, and a pair of gate side surfaces GL3 and GL4 on the outer peripheral surface FL3 side.
- the first outer peripheral surface FL1 and the first gate surface GL1 are on the same plane.
- the second outer peripheral surface FL2 and the second gate surface GL2 are extended lines extending in parallel to the optical axis OA from at least a portion M1 connecting the first outer peripheral surface FL1 and the first gate surface GL1. Or, up to the extension plane (broken line in FIG.
- a portion M2 (linear or strip-like portion) connecting the outer peripheral side surface FL3 and the gate side surfaces GL3 and GL4 has an R shape in a cross section perpendicular to the optical axis OA.
- the latter connecting portion M2 corresponds to a shallow hollow portion formed adjacent to the end surface EF in the cylindrical surface FL3a, as shown in FIGS. 1A and 1C.
- the second gate surface GL2 of the gate part GP includes a first surface GL2a extending radially outward from the second outer peripheral surface FL2 and perpendicular to the optical axis OA, and a first surface GL2a. Furthermore, it has the 2nd surface GL2b which extends outside and inclines with respect to 1st surface GL2a. That is, the thickness of the gate portion GP increases as it goes from the outer peripheral portion FL side to the runner portion RP side.
- a portion M3 (linear or strip-like portion) connecting the first surface GL2a and the second surface GL2b is R in a cross section parallel to the optical axis OA (more specifically, a cross section parallel to the optical axis OA and the forming axis PX).
- the runner portion RP includes a first runner surface RL1 on the first gate surface GL1 side, a second runner surface RL2 on the second gate surface GL2 side, and a pair of runner side surfaces RL3 and RL4 on the outer peripheral side surface FL3 side.
- the runner part RP is a quadrangular or semi-cylindrical member that narrows on the gate part GP side.
- the first runner surface RL1 is on the same plane as the first gate surface GL1, or has a surface on the extension of the first gate surface GL1.
- the second runner surface RL2 has a surface substantially parallel to the first runner surface RL1, and is connected to the second surface GL2b of the second gate surface GL2.
- Portions M4 and M5 (linear or strip portions) connecting the gate portion GP and the runner portion RP have an R shape in a cross section parallel to or perpendicular to the optical axis OA.
- a portion M4 connecting the second surface GL2b of the second gate surface GL2 and the second runner surface RL2 is a cross section parallel to the optical axis OA (more specifically, parallel to the optical axis OA and the forming axis PX). (Cross section) has an R shape.
- a portion M5 connecting the gate side surfaces GL3, GL4 and the runner side surfaces RL3, RL4 has an R shape in a cross section perpendicular to the optical axis OA.
- the molded product MP has the following conditional expression where d is the maximum outer diameter of the outer peripheral portion FL, W is the width of the gate portion GP in plan view, and r is the R radius of the R shape of the connecting portion M2. Satisfied. d ⁇ 2.0mm W ⁇ d / 2 r ⁇ d / 4
- a molding die 100 shown in FIG. 3 forms a mold space CV shown in FIG. 4A by clamping the movable die 10 and the fixed die 20 to form a lens OP (see FIGS. 1A to 1C) as an optical element. ).
- the molding die 100 is incorporated in an injection molding apparatus 400 that includes a temperature adjusting unit 30, a movable mold driving unit 40, a resin injection unit (not shown), and the like.
- the molding die 100 includes a movable die 10 and a fixed die 20.
- the movable mold 10 is driven by the movable mold drive unit 40 and can move forward and backward in the CD direction, and can be opened and closed with the fixed mold 20.
- a mold space CV and a flow path space FC are formed between both molds 10 and 20 shown in FIG. 4A.
- the mold space CV is for forming the lens OP shown in FIGS. 1A to 1C, and corresponds to the shape of the lens OP.
- the flow path space FC is for supplying resin to the mold space CV, and becomes the gate part GP and the runner part RP in the molded product MP shown in FIGS. 2A to 2C.
- the mold space CV is filled with molten resin by the resin injection portion through the flow path space FC.
- the mold space CV has a main body forming portion CV1 and an outer periphery forming portion CV2.
- the main body forming portion CV1 is formed by the first optical transfer surface 11A and the second optical transfer surface 12A.
- the outer periphery forming portion CV2 is formed by the first outer periphery transfer surface 21A, the second outer periphery transfer surface 22A, and the side surface transfer surface 23A.
- the first and second outer peripheral transfer surfaces 21A and 22A are a pair of surfaces parallel to the mold matching surfaces PL1 and PL2 of the movable mold 10 and the fixed mold 20.
- the ridge 41b on the second outer peripheral transfer surface 21A side of the outer periphery forming portion CV2 has an R shape in a cross section perpendicular to the mold matching surface PL1 (surface along the resin flow direction).
- the flow path space FC includes a gate formation portion GC that forms the gate portion GP and a runner formation portion RC that forms the runner portion RP.
- the gate forming portion GC communicates with a part of the periphery of the mold space CV.
- the gate forming portion GC is formed by a first gate forming surface 31A, a second gate forming surface 32A, and a pair of gate side surface forming surfaces 33A and 34A.
- the runner formation portion RC is formed by a first runner formation surface 41A that is a first flow path formation surface, a second runner formation surface 42A that is a second flow path formation surface, and a pair of runner side surface formation surfaces 43A and 44A. Is done.
- the movable mold 10 of the molding mold 100 includes a core mold 61, a mold plate 62, a receiving plate 63, a mounting plate 64, and an ejecting mechanism 65.
- the core mold 61 and the template 62 are made of the same steel material, for example, and are integrally fixed to each other. That is, the core mold 61 of the movable mold 10 is inserted and fixed in the hole 62 a provided in the mold plate 62.
- the template 62 is provided with a hole 62b into which a protrusion pin 65a of a protrusion mechanism 65 described later is inserted.
- the protrusion pin 65a moves back and forth at an appropriate timing in synchronism with the operation in which the mold plate 62 is driven by the movable mold drive unit 40 and moves forward and backward in the CD direction.
- the core mold 61 has a second optical transfer surface 12A having a smooth concave surface as a whole.
- the second optical transfer surface 12A corresponds to the second optical surface OL2 (see FIGS. 1A to 1C) of the lens OP in the molded product MP.
- the second outer peripheral transfer surface 22A and the side transfer surface 23A on the peripheral side formed by the template 62 respectively correspond to the second outer peripheral surface FL2 and the outer peripheral side surface FL3 (see FIGS. 1A to 1C) on the peripheral side of the lens OP.
- the second outer peripheral transfer surface 22A and the second gate forming surface 32A of the movable mold 10 are matched with each other at least a portion 41c connecting the first outer peripheral transfer surface 21A on the fixed mold 20 side and the first gate forming surface 31A. They are on the same plane up to an extension line or extension plane (dashed line in FIG. 4A) perpendicular to the plane PL1. That is, the depth of the outer periphery forming portion CV2 and the depth of at least the connecting portion 41c in the gate forming portion GC are the same.
- a portion 41d that connects the side surface transfer surface 23A of the outer periphery forming portion CV2 and the gate side surface forming surfaces 33A and 34A of the gate forming portion GC has an R shape in a cross section parallel to the die matching surface PL1.
- the side transfer surface 23A has a taper angle ⁇ that becomes narrower on the second outer peripheral transfer surface 22A side with respect to an axis AX (FIG. 3) perpendicular to the mold matching surface PL1.
- the taper angle ⁇ is in the range of 0.1 ° ⁇ ⁇ ⁇ 10 °.
- the second gate forming surface 32A of the gate forming portion GC extends outward from the second outer peripheral transfer surface 22A, and extends outward from the first transfer surface 32Aa and the first transfer surface 32Aa parallel to the mold combining surface PL1. And a second transfer surface 32Ab inclined with respect to the transfer surface 32Aa. That is, in the movable mold 10, the depth of the gate forming portion GC increases from the outer periphery forming portion CV2 side toward the runner forming portion RC side.
- a portion 41e that connects the first transfer surface 32Aa and the second transfer surface 32Ab has an R shape in a cross section perpendicular to the die mating surface PL1 (more specifically, a cross section perpendicular to the die mating surface PL1 and along the flow direction CU).
- the portion connecting the gate forming portion GC and the runner forming portion RC has an R shape in a cross section perpendicular to or parallel to the die matching surface PL1.
- a section 41f connecting the second transfer surface 32Ab of the second gate formation surface 32A and the second runner formation surface 42A is a cross section perpendicular to the mold matching surface PL1 (more specifically, perpendicular to the mold matching surface PL1).
- a portion 41g connecting the gate side surface forming surfaces 33A, 34A and the runner side surface forming surfaces 43A, 44A has an R shape in a cross section parallel to the die matching surface PL1.
- the receiving plate 63 supports the template 62 from behind.
- the mounting plate 64 supports the receiving plate 63 from behind.
- the receiving plate 63 is formed with a hole 63b into which a protrusion pin 65a of a protrusion mechanism 65 described later is inserted.
- the ejection mechanism 65 is for ejecting the runner part RP of the molded product MP from the movable mold 10.
- the protrusion mechanism 65 includes a protrusion pin 65a that protrudes the runner portion RP from an oblique direction with respect to the mold matching surface PL1 or the axis AX, and an advance / retreat member 65b that moves the protrusion pin 65a forward and backward.
- the protruding pin 65a is inserted into holes 62b and 63b formed in the template 62 and the receiving plate 63, respectively, so as to advance and retract.
- the tip of the protrusion pin 65a is disposed near the second runner formation surface 42A, preferably the second gate formation surface 32A of the second runner formation surface 42A.
- the ejector pin 65a is driven by the advancing / retracting member 65b to advance toward the fixed mold 20, and automatically retracts and returns to its original position as the advancing / retracting member 65b moves backward.
- the advance / retreat member 65b is driven by an advance / retreat drive device (not shown), and advances / retreats in the CD direction parallel to the axis AX at an appropriate timing and amount.
- the projecting pin 65a of the projecting mechanism 65 has the second runner forming surface of the movable mold 10 at the same angle as the taper angle ⁇ of the side transfer surface 23A on the second gate forming surface 32A side. Protrudes from 42A.
- the fixed mold 20 includes a core mold 71, a mold plate 72, and a mounting plate 74.
- the core mold 71 and the template 72 are made of, for example, the same steel material and are integrally fixed to each other. That is, the core mold 71 of the fixed mold 20 is inserted and fixed in a hole 72 a provided in the mold plate 72.
- the core mold 71 has a smooth concave first optical transfer surface 11A on the side facing the movable mold 10.
- the first optical transfer surface 11A corresponds to the first optical surface OL1 (see FIGS. 1A to 1C) of the lens OP of the molded product MP.
- the peripheral first outer peripheral transfer surface 21A formed by the template 72 corresponds to the peripheral first peripheral outer surface FL1 (see FIGS. 1A to 1C).
- the first outer peripheral transfer surface 21A and the first gate forming surface 31A of the fixed mold 20 are on the same plane.
- the first gate formation surface 31A and the first runner formation surface 41A are on the same plane.
- the mounting plate 74 supports the template 72 from behind. Unlike the mold plate 62 of the movable mold 10, the mold plate 72 supported by the mounting plate 74 is maintained in a fixed state. A sprue bush (not shown) or the like is attached to the outside of the attachment plate 74 on the molten resin supply source side.
- the movable mold 10 and the fixed mold 20 are appropriately heated by a temperature adjusting unit 30 (not shown). Thereby, in both the molds 10 and 20, the temperature of the mold part that forms the mold space CV and the flow path space FC is set to a temperature state suitable for molding.
- the movable mold driving unit 40 is operated, and the movable mold 10 is advanced to the fixed mold 20 side to be in the mold closed state.
- mold clamping is performed to clamp the movable mold 10 and the fixed mold 20 with a necessary pressure.
- a resin injection unit (not shown) is operated to fill the mold space CV with the molten resin through the flow path space FC.
- the molten resin is gradually cooled by heat dissipation and solidified while maintaining the holding pressure in the mold space CV.
- the movable mold driving unit 40 is operated to move the clamped movable mold 10 backward, and mold opening for separating the movable mold 10 from the fixed mold 20 is performed.
- the molded product MP is released from the fixed mold 20 while being held by the movable mold 10 as shown in FIG. 5A.
- an advance / retreat driving device (not shown) is operated to project the runner portion RP. At this time, as shown in FIG.
- the protrusion pin 65a is the same as the taper angle ⁇ of the surface on the second gate forming surface 32A side of the side transfer surface 23A of the movable mold 10 via the advance / retreat member 65b of the protrusion mechanism 65. It protrudes from the second runner forming surface 42A at an angle.
- the lens OP is released from the movable mold 10.
- the lens OP released from both molds 10 and 20 is carried out of the injection molding apparatus 400 by gripping a sprue portion (not shown) extending from the runner portion RP. Further, the lens OP after being carried out is subjected to outer shape processing such as removal of the gate portion GP to be a product for shipment.
- the first outer peripheral transfer surface 21A and the first gate forming surface 31A of the stationary die 20 are made the same plane, so that the molded product MP on the side of the stationary die 20 is improved.
- a notch shape is not formed in the portion M1 connecting the outer peripheral portion FL and the gate portion GP.
- the outer peripheral portion FL and the gate portion GP to be molded have the same thickness, and the rigidity of the gate portion GP can be ensured.
- the lens OP can be released from the movable mold 10 with good surface accuracy of the lens OP without directly projecting the lens OP as the product portion.
- portion 41d that connects the outer periphery forming portion CV2 and the gate forming portion GC is R-shaped, stress is concentrated at the portion M2 that connects the outer periphery FL and the gate portion GP when the molded product MP is released. Can be prevented. Thereby, it can prevent that the gate part GP of the molded product MP bends or breaks at the time of mold release. Further, by bending the runner portion RP at the same angle as the taper angle ⁇ of the side transfer surface 23A on the second gate forming surface 32A side, bending deformation of the gate portion GP that may occur when protruding in the direction perpendicular to the mold matching surface PL1. Etc. can be prevented.
- the outer peripheral portion FL of the lens OP is prevented from being caught at the portion on the fixed mold 20 side that is particularly susceptible to mold release inhibition in the outer peripheral forming portion CV2 opposite to the gate forming portion GC (on the opposite gate side).
- Can do since the side transfer surface 23A has a taper angle ⁇ , even if only the runner portion RP protrudes in an oblique direction, the outer peripheral side surface FL3 is not more caught by the movable mold 10, and the lens OP is easily separated from the movable mold 10. Can be typed.
- the molding die of the second embodiment is a modification of the molding die or the like of the first embodiment, and matters not specifically described are the same as those of the first embodiment.
- the second gate forming surface 32A of the gate forming portion GC extends outward from the second outer peripheral transfer surface 22A and is parallel to the mold alignment surface PL1.
- the surface 32Aa has a second transfer surface 32Ab that extends outward from the first transfer surface 32Aa and is inclined with respect to the first transfer surface 32Aa.
- the gate side surface forming surfaces 33A and 34A of the gate forming portion GC extend outward from the side surface transfer surface 23A with respect to the mold matching surface PL1 and the portion 41c connecting the first outer peripheral transfer surface 21A and the first gate forming surface 31A.
- Third transfer surfaces 33Aa and 34Aa that are perpendicular to each other and fourth transfer surfaces 33Ab and 34Ab that extend outward from the third transfer surfaces 33Aa and 34Aa and are inclined with respect to the third transfer surfaces 33Aa and 34Aa, respectively. That is, in the movable mold 10, the depth and width of the gate forming portion GC increase from the outer periphery forming portion CV2 side toward the runner forming portion RC side.
- a portion 41h connecting the third transfer surfaces 33Aa and 34Aa and the fourth transfer surfaces 33Ab and 34Ab also has an R shape in a cross section parallel to the mold matching surface PL1.
- the thickness and width increase as the gate portion GP moves from the outer peripheral portion FL side to the runner portion RP side. .
- the molding die or the like of the third embodiment is a modification of the molding die or the like of the first embodiment, and matters not specifically described are the same as those of the first embodiment.
- the second gate formation surface 32A of the gate formation portion GC has a gently curved surface from the second outer peripheral transfer surface 22A side to the second runner formation surface 42A side. That is, in the movable mold 10, the depth of the gate forming portion GC increases from the outer periphery forming portion CV2 side toward the runner forming portion RC side.
- the molded product MP molded by the molding die 100 shown in FIGS. 7A and 7B has a gently curved surface whose thickness increases in the gate portion GP from the outer peripheral portion FL side toward the runner portion RP side.
- the second gate surface GL2 is formed.
- the molding die or the like of the fourth embodiment is a modification of the molding die or the like of the first embodiment, and items not specifically described are the same as those of the first embodiment.
- the molded product MP has a support shaft portion SP and a sub-gate portion TP between the gate portion GP and the runner portion RP.
- the flow path part is the runner part RP, the support shaft part SP, and the sub-gate part TP.
- the support shaft portion SP is for fixing the molded product MP to a support jig (not shown), for example.
- the spindle part SP has a main body part SP1 and reference parts SP2 and SP3. The reference portions SP2 and SP3 are used for alignment when the molded product MP is fixed to the support jig.
- the sub-gate portion TP is a portion that connects the runner portion RP and the support shaft portion SP, and is cut at the sub-gate portion TP when used for measuring an optical molded product, for example.
- the support jig is attached to an optical molded product measuring device or the like.
- the molding die 100 corresponds to the shape of the support shaft portion SP of the molded product MP described above, and the flow path forming surfaces 51A and 52A for forming the support shaft portion SP, and the sub-gate portion TP.
- the flow path forming surface 51A on the fixed mold 20 side that forms the support shaft part SP is the first flow path forming surface
- the flow path forming surface 52A on the movable mold 10 side is the second flow path forming. Surface.
- the flow path forming surface 52A is provided with reference portion forming surfaces 55A and 56A for forming the reference portions SP2 and SP3 of the support shaft portion SP.
- the movable mold 10 is provided with a protruding pin 65a that protrudes from the support shaft portion SP so as to protrude from the reference portions SP2 and SP3 of the support shaft portion SP of the molded product MP, that is, from the reference portion forming surfaces 55A and 56A. Yes.
- the molding die according to the present embodiment has been described above, but the molding die according to the present invention is not limited to the above.
- the shape of the lens OP is an exemplification, and the shapes of the optical surfaces OL1, OL2, etc. can be appropriately changed according to the application.
- the lens OP is cut parallel to the optical axis OA and perpendicular to the molding axis PX without substantially leaving the gate portion GP with reference to the outer diameter of the second outer peripheral surface FL2. And as shown to 9B, you may cut
- the boundary between the second gate surface GL2 and the pair of gate side surfaces GL3 and GL4 sandwiching the second gate surface GL2 may be an R shape.
- the angle at which the runner portion RP is protruded by the protrusion pin 65a may not be exactly the same as the taper angle ⁇ of the side transfer surface 23A on the second gate forming surface 32A side, and there may be a slight angle difference. Are also considered to be at the same angle.
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Abstract
Description
d≦2.0mm
W≦d/2
r≦d/4
この場合、成形金型が上記範囲の寸法を満たすことにより、成形品延いては光学素子を金型から容易に離型することができる。
0.1°≦α≦10°
図1A~1Dを参照しつつ、本発明に係る第1実施形態の光学素子について説明する。光学素子であるレンズOPは、樹脂製の小型レンズであり、例えば光ピックアップ装置の対物レンズ(具体的には、BD(Blu-ray Disc:商標)専用レンズ)や内視鏡用のレンズとして用いられる。レンズOPは、図2A~2Cに示す成形品MPのうちゲート部GPを切断することによって得られる。
d≦2.0mm
W≦d/2
r≦d/4
d≦2.0mm
W≦d/2
r≦d/4
まず、不図示の温度調節部30により、可動金型10と固定金型20とを適宜加熱する。これにより、両金型10,20において、型空間CV及び流路空間FCを形成する金型部分の温度を成形に適する温度状態とする。次に、可動金型駆動部40を動作させ、可動金型10を固定金型20側に前進させて型閉じ状態とする。可動金型駆動部40の閉状態をさらに継続することにより、可動金型10と固定金型20とを必要な圧力で締め付ける型締めが行われる。次に、不図示の樹脂射出部を動作させて、流路空間FCを介して型空間CVに溶融樹脂を充填させる。その後、型空間CV内の保圧を保った状態で溶融樹脂を放熱によって徐々に冷却させ、固化させる。次に、可動金型駆動部40を動作させ、型締めされた可動金型10を後退させ、可動金型10を固定金型20から離間させる型開きを行わせる。この結果、成形品MPは、図5Aに示すように、可動金型10に保持された状態で固定金型20から離型される。次に、不図示の進退駆動装置を動作させて、ランナー部RPの突き出しを行わせる。この際、図5Bに示すように、突き出し機構65の進退部材65bを介して突き出しピン65aを可動金型10の側面転写面23Aのうち第2ゲート形成面32A側の面のテーパー角αと同じ角度で第2ランナー形成面42Aから突き出す。この結果、レンズOPが可動金型10から離型される。なお、両金型10,20から離型されたレンズOPは、ランナー部RPから延びる不図示のスプルー部等を把持することによって、射出成形装置400の外部に搬出される。さらに、搬出後のレンズOPは、ゲート部GPの除去等の外形加工を施されて出荷用の製品とされる。
以下、第2実施形態の成形金型等について説明する。第2実施形態の成形金型等は、第1実施形態の成形金型等を変形したものであり、特に説明しない事項は、第1実施形態と同様である。
以下、第3実施形態の成形金型等について説明する。第3実施形態の成形金型等は、第1実施形態の成形金型等を変形したものであり、特に説明しない事項は、第1実施形態と同様である。
以下、第4実施形態の成形金型等について説明する。第4実施形態の成形金型等は、第1実施形態の成形金型等を変形したものであり、特に説明しない事項は、第1実施形態と同様である。
Claims (9)
- 光学素子の第1光学面と、前記第1光学面の周囲に延びる第1外周面とを形成する固定金型と、前記光学素子の第2光学面と、前記第2光学面の周囲に延びる第2外周面と、前記第1外周面と前記第2外周面とを繋ぐ外周側面とを形成する可動金型とを備える成形金型であって、
前記固定金型は、前記第1光学面を形成する第1光学転写面と、前記第1外周面を形成する第1外周転写面と、ゲート部を形成する第1ゲート形成面と、流路部を形成する第1流路形成面と有し、
前記可動金型は、前記第2光学面を形成する第2光学転写面と、前記第2外周面を形成する第2外周転写面と、前記外周側面を形成する側面転写面と、前記ゲート部を形成する第2ゲート形成面と、前記流路部を形成する第2流路形成面と有し、
前記第1及び第2外周転写面は、前記固定金型と前記可動金型との型合わせ面に平行な一対の面であり、前記第1外周転写面と前記第1ゲート形成面とが同一の平面上にあり、
前記固定金型と前記可動金型とは、前記第1及び第2外周転写面と前記側面転写面とで構成される外周形成部と、前記第1及び2ゲート形成面で構成されるゲート形成部とを有し、
前記外周形成部と前記ゲート形成部とを繋ぐ部分が前記型合わせ面に平行な断面においてR形状を有し、
前記側面転写面は、第2外周転写面側で狭まるテーパー角を有し、
前記可動金型は、前記光学素子の前記流路部を突き出す突き出し機構を有し、
前記突き出し機構は、前記側面転写面のうち前記第2ゲート形成面側の面のテーパー角と同じ角度で前記可動金型の前記第1流路形成面側に突き出る突き出しピンを有する、成形金型。 - 前記第2外周転写面と、前記第2ゲート形成面とは、少なくとも前記第1外周転写面と前記第1ゲート形成面とを繋ぐ部分の前記型合わせ面に垂直な延長線上まで同一の平面上にあり、前記外周形成部の深さと前記ゲート形成部のうち少なくとも前記繋ぐ部分における深さとが同じである、請求項1に記載の成形金型。
- 前記ゲート形成部は、前記可動金型において前記外周形成部側から前記流路形成面で構成される流路形成部側に向かうにつれ深さ及び幅の少なくともいずれか一方が増加し、
前記ゲート形成部と前記流路形成部とを繋ぐ部分が前記型合わせ面に垂直な断面においてR形状を有する、請求項1及び2のいずれか一項に記載の成形金型。 - 前記外周形成部の外径をdとし、前記ゲート形成部の幅をWとし、前記R形状のR半径をrとしたときに、以下の条件式を満足する、請求項1から3までのいずれか一項に記載の成形金型。
d≦2.0mm
W≦d/2
r≦d/4 - 前記外周形成部の前記第2外周面側の稜部は、前記型合わせ面に垂直な断面においてR形状を有する、請求項1から4までのいずれか一項に記載の成形金型。
- 前記ゲート形成部は、前記第2外周転写面から外側に延び前記型合わせ面に対して平行な第1転写面と、前記第1転写面から外側に延び前記第1転写面に対して傾斜する第2転写面とを有し、
前記第1転写面と前記第2転写面とを繋ぐ部分が、前記型合わせ面に垂直な断面においてR形状を有する、請求項1から5までのいずれか一項に記載の成形金型。 - 前記側面転写面のテーパー角をαとしたときに、以下の条件式を満足する、請求項1から6までのいずれか一項に記載の成形金型。
0.1°≦α≦10° - 請求項1から7までのいずれか一項に記載の成形金型を用いて成形品を成形する成形工程と、
前記突き出し機構を用いて前記側面転写面のうち前記ゲート形成面側の面のテーパー角と同じ角度で前記成形品のうち前記流路部を突き出す突き出し工程と、
を備える、光学素子の製造方法。 - 請求項1から7までのいずれか一項に記載の成形金型を用いて製造した光学素子。
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US14/429,313 US9914252B2 (en) | 2012-09-18 | 2013-09-05 | Molding die, optical element manufacturing method, and optical element |
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