WO2011037038A1 - 成形金型及び成形方法 - Google Patents
成形金型及び成形方法 Download PDFInfo
- Publication number
- WO2011037038A1 WO2011037038A1 PCT/JP2010/065798 JP2010065798W WO2011037038A1 WO 2011037038 A1 WO2011037038 A1 WO 2011037038A1 JP 2010065798 W JP2010065798 W JP 2010065798W WO 2011037038 A1 WO2011037038 A1 WO 2011037038A1
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- WIPO (PCT)
- Prior art keywords
- mold
- lens
- central portion
- pin
- molding die
- 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
- 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
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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
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- 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 used for molding a lens and a molding method using the molding die.
- Some molds include a fixed mold and a movable mold.
- a method of taking out the molded product from such a molding die for example, the molded product remaining on the movable mold side after the mold is opened is gripped by the hand, and the movable die is moved backward in this state, thereby forming from the movable die.
- Some products are separated (see Patent Document 1).
- the molded product suction means for vacuum-sucking the molded product adhering to the transfer surface of the core provided on the lower mold after the mold is opened, and ascending by entering the lower position of the molded product there is a product provided with product peeling means for peeling the molded product from the transfer surface (see Patent Document 2).
- the peeling claw is only applied to one point on the lens outer periphery, and a biased force is applied to a part of the lens outer periphery, so that the lens surface is deformed or uneven. The shape collapses and the desired releasability cannot be ensured.
- an object of the present invention is to provide a molding die and a molding method capable of realizing lens performance that satisfies the standard by preventing deformation of the lens surface and accurately transferring the uneven shape.
- a molding die according to the present invention is arranged around a central portion provided with a first transfer surface for forming an optical surface having an uneven shape in a lens, and around the central portion when the die is closed. And a second mold having a second transfer surface formed shallower than the first transfer surface, and the first mold is centered after the mold is opened.
- a protrusion suppressing operation is possible that moves the portion forward relative to the peripheral portion toward the second mold, and suppresses the backward movement of the lens when the central portion is moved backward after the protruding operation.
- the return restraining portion provided in the first die enables smooth release from the center portion of the lens by suppressing the backward movement of the lens when the center portion is retracted after the protruding operation. Therefore, basically, the operation in which the central portion retreats in the axial direction enables the mold release without distortion of the lens from the deep first transfer surface provided in the central portion. Thereby, compared with the operation
- the return suppressing portion has a plurality of pin-shaped members incorporated in the peripheral portion, and the plurality of pin-shaped members together with the central portion during the protruding operation Each of them moves forward and receives a force held on the peripheral side when the central part is retracted, so that the backward movement is suppressed.
- the plurality of pin-shaped members tend to be kept in their original positions with respect to the peripheral portion while the central portion is retracted, and thus simple release from the central portion of the lens becomes possible.
- the plurality of pin-like members are embedded in the peripheral portion so as to be displaceable, and the return suppressing portion has a plurality of pin-like shapes between the peripheral portion and the plurality of pin-like members. It has a locking member that prevents the member from retreating with a force greater than a predetermined value.
- the plurality of pin-shaped members can be held together with the peripheral portion at the original projecting position, and it is possible to reliably prevent the lens from retreating even if the central portion is retracted.
- a runner protruding member that protrudes from the lens by advancing together with the central portion during a protruding operation and that suppresses the retreat of the runner when the central portion is retracted is provided.
- the release of the lens can be assisted from the runner portion side by the runner protruding member, and the reliable release is possible.
- the return suppression unit separates the lens from the center using air pressure.
- the lens can be released from the central portion with a relatively uniform force.
- a plurality of protrusions extend from the lens to the periphery along the parting line, and the return suppression portion prevents the plurality of protrusions from retreating when the center portion is retracted. By doing so, the lens is separated from the central portion. In this case, the lens can be released from the central portion in a balanced manner using a plurality of protrusions extending around the lens.
- a separation mechanism is provided that moves the lens in the direction of the protruding operation after releasing the lens from the center.
- the entire molded product including the lens can be sufficiently separated from the first mold by the separation mechanism to facilitate the removal of the lens.
- the central portion forms the optical function portion of the lens
- the peripheral portion forms the flange portion of the lens
- the second mold is fixedly supported, and the first mold moves in the horizontal direction to open and close the mold with the second mold.
- the first mold and the second mold are incorporated into a horizontal molding machine.
- the first mold is fixedly supported, and the second mold moves in the vertical direction to open and close the mold with the first mold.
- the first mold and the second mold are incorporated into a vertical molding machine.
- the molding method according to the present invention includes a first mold having a central portion provided with a first transfer surface for forming an optical surface having a concavo-convex shape in a lens, and a shallower depth than the first transfer surface.
- the first step of molding the lens in the mold space in a state where the mold space is formed by combining the second mold having the second transfer surface and the first mold and the second mold are separated from each other.
- a fourth step of releasing the lens from the central portion by retracting the central portion after the step and suppressing the backward movement of the lens by the return suppressing portion.
- the lens is released from the central portion by suppressing the backward movement of the lens by the return suppressing portion, so that it is possible to moderately release the mold by avoiding an excessive force being applied to the lens locally. Therefore, it is possible to obtain a lens in which the concave and convex shape is precisely transferred by preventing deformation of the lens surface.
- the lens molded in the mold space is an objective lens for an optical pickup, and is formed by a first mold and corresponds to a first transfer surface.
- One optical surface is disposed on the light source side, and a second optical surface formed by the second mold and corresponding to the second transfer surface is disposed on the optical information recording medium side.
- the lens molded in the mold space has an NA of 0.75 or more.
- the objective lens for the optical pickup has a precise uneven shape while having a high NA.
- BD Blu-Ray Disc
- high-precision reading or writing becomes possible.
- a compatible objective lens corresponding to an optical information recording medium of a plurality of standards including BD is formed, the transfer of the diffractive structure as a concavo-convex shape becomes precise, and the reliability of the objective lens can be improved.
- FIG. 2A is a diagram illustrating a flow path space for supplying resin to the mold space
- FIG. 2B is a diagram illustrating a mold space for molding a lens
- FIG. 3A is a perspective view for explaining the appearance of a molded product formed by the molding die shown in FIG. 1, and FIG. 3B is a side view of a lens as a product.
- FIG. 4A is a side sectional view for explaining the main part of the molding die, and FIG. 4B is an end view for explaining the main part of the molding die.
- 5 (A) to 5 (D) are diagrams illustrating a method of locking the pin-shaped member shown in FIG. 4 (A).
- FIGS. 9A to 9C are side cross-sectional views for explaining a main part of the molding die of the second to fourth embodiments.
- FIG. 10A to FIG. 10C are side cross-sectional views for explaining the main part of the molding die of the fifth embodiment. It is a sectional side view explaining the shaping die of a 6th embodiment. It is a figure explaining the injection molding machine incorporating the molding die of a 7th embodiment.
- the molding die 40 of the present embodiment includes a first die 41 and a second die 42.
- die 41 can be reciprocated to AB direction.
- the first mold 41 is moved toward the second mold 42, the first mold 41 and the second mold 42 are matched with the parting surfaces PS1 and PS2, and the mold is clamped. ),
- a mold space CV for molding a lens and a flow path space FC for supplying resin to the mold space CV are formed.
- the flow path space FC is a space that forms the sprue portion SP and the runner portion RP of the molded product MP shown in FIG. 3 (A).
- the flow path space FC is branched into four corresponding to the four runner parts RP, and four molds are formed via the gate part GS that forms the gate part GP of the molded product MP at the four branched front ends. Each communicates with the space CV.
- the mold space CV is surrounded by a main body space CV1 sandwiched between the first and second transfer surfaces S1 and S2, and the third and fourth transfer surfaces S3 and S4. Flange space CV2.
- the first and second transfer surfaces S1 and S2 are for forming the optical surfaces OS1 and OS2 of the central optical function part OP in the lens LP shown in an enlarged manner in FIG. This corresponds to the end faces of the core molds 64a and 74a.
- One first transfer surface S1 is disposed on the laser light source side, and has a deeper curvature than the other second transfer surface S2 disposed on the information recording medium side.
- the first transfer surface S1 is provided with a concavo-convex shape that is a diffractive structure, and the one optical surface OS1 of the lens LP has a diffractive structure.
- the third and fourth transfer surfaces S3 and S4 are portions for forming the flange portion FL of the lens LP, and correspond to end surfaces of outer peripheral molds 64b and 74b described later.
- the lens LP shown in FIG. 3B is an objective lens for an optical pickup, and in the case of this embodiment, it is assumed to be a three-standard compatible single objective lens.
- the lens LP has, for example, a BD (Blu-ray Disc) with a wavelength of 405 nm and a DVD (with a wavelength of 655 nm, NA 0.65) depending on optical characteristics such as a diffractive structure formed on the optical surface OS1. It is possible to read or write optical information corresponding to three standards of Digital (Versatile (Disc)) and a CD of wavelength 780 nm and NA 0.53.
- the first mold 41 on the movable side supports a template 61 that forms the parting surface PS1, a receiving plate 62 that supports the template 61 from the back, and supports the receiving plate 62 from the back.
- the projecting pins 65 and 66 for projecting and releasing the runner portion RP and the like of the product MP, the movable rod 67a for pushing the core mold 64a from the rear, the movable rod 67b for pushing the ejecting pins 65 and 66 from the rear, and the movable rod 67a, And an advancing / retreating mechanism 69 for moving 67b forward / backward.
- the core die 64a is driven by the moving movable rod 67a to move forward to the second mold 42 side, and automatically moves backward with the moving rod 67a moving backward to return to the original position.
- the protruding pins 65 and 66 are driven by the movable rod 67b to move forward to the second mold 42 side and are held as they are even when the movable rod 67b is moved backward, but when the external force is applied, the protruding pins 65 and 66 move backward. Return to the position.
- a mold plate 61 which is a mold part on the mold surface side corresponds to a cold slug recess 61a corresponding to the cold slug part 00 of the molded product MP shown in FIG. 3A and a runner part RP.
- a jacket 51 which is a flow path for circulating a heat medium, is formed in order to keep the temperature of the mold at an appropriate temperature during molding. Further, a temperature sensor 52 for measuring the temperature of the first mold 41, that is, the surface temperature of the mold space CV formed by the mold plate 61 is embedded in the mold plate 61.
- the second mold 42 on the fixed side includes a mold plate 71 that forms the parting surface PS2, a mounting plate 72 that supports the mold plate 71 from behind, and a mold space CV shown in FIG.
- a core die 74a as a central portion to be formed, an outer peripheral die 74b as a peripheral portion for forming the die space CV from the fixed side, and a sprue bush 77 are provided.
- a mold plate 71 which is a mold part on the mold surface side includes a sprue bush hole 71a provided for inserting the sprue bush 77, and a runner portion of the molded product MP shown in FIG.
- a runner recess 71b for forming the RP, a gate surface 71c for forming the gate portion GP, and a through hole 71e provided for inserting the outer peripheral die 74b are provided.
- the sprue bush 77 is inserted and fixed in the sprue bush hole 71 a of the template 71 and the sprue bush hole 72 a of the mounting plate 72.
- the flow path 77a formed in the sprue bush 77 forms a sprue portion SP of the molded product MP shown in FIG.
- a jacket 53 which is a flow path for circulating a heat medium, is formed in order to keep the temperature of the mold at an appropriate temperature during molding. Further, a temperature sensor 54 for measuring the temperature of the second mold 42, that is, the surface temperature of the mold space CV, etc. is embedded in the template 71.
- the core mold 64a has a cylindrical outer shape, is accommodated in the outer peripheral mold 64b, and is movable in the axis AX direction corresponding to the AB direction in FIG.
- the outer peripheral mold 64 b has a cylindrical outer shape and is fixed in a state of being embedded in the through hole 61 e of the template 61.
- the core mold 64a is pushed and moved while being supported by the movable rod 67a from behind, advances to the second mold 42 side ahead along the axis AX, and protrudes from the parting surface PS1 of the template 61.
- the core mold 64a is arranged by winding a return spring 81 around the periphery, and when the movable rod 67a is retracted, the core mold 64a is retracted rearward along the axis AX and is accommodated in the outer periphery mold 64b.
- the outer peripheral mold 64b is not displaced by being accommodated in the through hole 61e of the template 61 even if the core mold 64a moves back and forth.
- the outer peripheral mold 64b has a step of the third transfer surface S3 at the tip 82, and the tip 82 has four insertion holes 82a extending through the third transfer surface S3 and parallel to the axis AX. Is formed.
- the four insertion holes 82a are symmetrically arranged around the axis AX so as to be separated from each other by an equal angle.
- a pin-like member 83 is passed through each insertion hole 82a as a return suppressing portion.
- the pin-shaped member 83 is passed through the insertion hole 82a and extends to the base side of the outer peripheral mold 64b. Similarly to the core mold 64a, the pin-shaped member 83 is pushed and moved from behind by the movable rod 67a, advances to the second mold 42 side ahead along the axis AX, and the insertion hole 82a of the template 61 Or projecting from the parting surface PS1. Note that the pin-shaped member 83 is independent of the core mold 64a, and even if the movable rod 67a is retracted, the relative position with respect to the outer peripheral mold 64b is maintained unless an external force greater than a predetermined value is applied, and the insertion hole 82a and the like.
- the pin-like member 83 moves forward and once protrudes, the pin-like member 83 is held in that state unless it is pushed back with a strong force of a certain degree or more. It is stored in the hole 82a and returns to the retracted state.
- the pin-shaped member 83 can be replaced with, for example, an annular member surrounding the outer periphery of the core die 64a. In this case as well, if the pin-shaped member 83 moves forward and temporarily protrudes, it is not pushed back with a strong force of a certain degree or more. It shall be held in that state.
- the pin-like member 83 is restrained from retreating toward the movable rod 67a by, for example, a locking member 84.
- the locking member 84 includes a recess 84a provided on the side surface of the outer peripheral mold 64b and a ball 84b fitted in the recess 84a.
- the ball 84b is blocked by the pin-like member 83, is prevented from being detached from the recess 84a, and is maintained in a state of being locked to the recess 84a.
- FIG. 5B shows a modification of the locking member 84 shown in FIG.
- the locking member 84 is configured to include a magnet 84d provided at an appropriate position of the pin-shaped member 83, and cooperates with the inner wall portion 84e around the insertion hole 82a provided in the outer peripheral mold 64b.
- the suction force is applied so that 84d is held in the insertion hole 82a.
- the magnet 84d is attracted to the inner wall portion 84e of the magnetic body and is maintained in the protruding state.
- the pin-like member 83 is pushed back with a strong force against the magnetic force of the magnet 84d, the pin-like member 83 returns to the retracted state accommodated in the insertion hole 82a of the outer peripheral die 64b.
- FIG. 5C shows another modification of the locking member 84 shown in FIG.
- the locking member 84 includes an elastic member 84g provided at an appropriate position of the pin-shaped member 83, and restricts the movement of the pin-shaped member 83 in cooperation with the inner wall portion 84e of the outer peripheral mold 64b. Apply frictional force. As a result, when the pin-like member 83 moves forward and once protrudes, the pin-like member 83 is locked to the inner wall portion 84e via the elastic member 84g and is maintained in the protruding state.
- the pin-shaped member 83 when the pin-shaped member 83 is pushed back with a strong force exceeding the frictional force between the elastic member 84g and the inner wall portion 84e, the pin-shaped member 83 returns to the retracted state accommodated in the insertion hole 82a of the outer peripheral mold 64b.
- FIG. 5D shows still another modification of the locking member 84 shown in FIG.
- the locking member 84 is configured to include a plunger 84h embedded in the distal end portion 82 of the outer peripheral mold 64b, and provides a frictional force that restricts the movement of the pin-shaped member 83 in cooperation with the inner wall portion 84e.
- the pin-like member 83 moves forward and once enters the protruding state, the pin-like member 83 is biased by the plunger 84h and is locked to the inner wall portion 84e and is maintained in the protruding state.
- the pin-like member 83 is pushed back with a strong force exceeding the frictional force with the inner wall portion 84e, the pin-like member 83 returns to the retracted state accommodated in the insertion hole 82a of the outer peripheral mold 64b.
- the protrusion pin 65 functions as a runner protrusion member. That is, the protrusion pin 65 is pushed and moved from behind by the movable rod 67b, moves forward parallel to the axis AX, and protrudes from the parting surface PS1 of the template 61. Even if the movable rod 67b is retracted, the protrusion pin 65 is held in a state of protruding from the parting surface PS1 unless an external force exceeding a predetermined value is applied.
- the protrusion pin 65 moves forward and once enters the protrusion state, the protrusion pin 65 is maintained in that state unless pushed back with a strong force of a certain degree or more, and when pushed back with a relatively strong force, the through hole of the template 61 It is stored in 61f and returns to the retracted state.
- the protruding pin 66 is also driven by the movable rod 67b and operates in the same manner as the protruding pin 65.
- FIG. 6A shows a state in which the molded product MP is released from the second mold 42 by opening the mold to retract the first mold 41 (second step).
- the molded product MP is held in the first mold 41 having a large depression, and the lens LP is in close contact with the core mold 64a and the outer mold 64b.
- a protruding operation is performed to advance the core mold 64a and the protruding pins 65 and 66 toward the second mold 42 (third step).
- the whole mold release is performed about the molded product MP. That is, the flange portion FL of the lens LP is released from the outer peripheral mold 64b, and the runner portion RP and the like are released from the mold plate 61. Note that the optical surface OS1 of the optical function part OP of the lens LP remains in close contact with the first transfer surface S1 of the core mold 64a. At this stage, the molded product MP is loosely gripped by a take-out hand to be described later. Next, as shown in FIG. 6C, the core die 64a is moved backward to release the optical function part OP of the lens LP (fourth step).
- the first transfer surface S1 of the core mold 64a and the optical surface OS1 of the optical function part OP of the lens LP are separated from each other, and the release of the optical function part OP from the core mold 64a is achieved.
- the core mold 64a is retracted, a large force is not received as the molded product MP, so that the protruding pin 65 is maintained in a state of protruding from the parting surface PS1 of the template 61.
- the pin-shaped member 83 is also maintained in a state of protruding from the third transfer surface S3 and the parting surface PS1 of the template 61.
- the pin-shaped member 83 assists the backward movement of the lens LP, and further promotes the release of the optical function part OP of the lens LP. As a result, it is possible to avoid applying a local force to the lens LP, and it is possible to prevent deformation of the optical surface OS1 and transfer failure during release.
- the molded product MP including the lens LP is conveyed to a place away from the first mold 41.
- the four pin-shaped members 83 are embedded in the outer peripheral mold 64b, but three or five or more pin-shaped members 83 may be embedded in the outer peripheral mold 64b. it can.
- FIG. 7 is a front view for explaining a molding apparatus incorporating the molding die 40 shown in FIG.
- the illustrated molding apparatus 100 includes an injection molding machine 10 that is a main body part that performs injection molding to produce a molded product MP, a take-out device 20 that is an accessory part that takes out the molded product MP from the injection molding machine 10, and a molding apparatus 100. And a control device 30 for comprehensively controlling the operation of each unit constituting the.
- the injection molding machine 10 is a horizontal molding machine, and includes a molding die 40, a movable platen 11, a fixed platen 12, a mold clamping plate 13, an opening / closing drive device 15, and an injection device 16.
- the injection molding machine 10 includes a first mold 41 and a second mold by sandwiching a first mold 41 and a second mold 42 constituting the molding mold 40 between the movable platen 11 and the fixed platen 12. Molding is possible by clamping the mold 42.
- the movable platen 11 is supported by a slide guide 15a so as to be movable back and forth with respect to the fixed platen 12.
- the movable platen 11 detachably supports the first mold 41.
- an ejector 45 is incorporated in the movable platen 11.
- the ejector 45 is a part that operates the advance / retreat mechanism 69 shown in FIG. 1, and by moving the movable rods 67a and 67b, the molded product MP in the first mold 41 is released to release the second mold. It extrudes to 42 side, and the transfer by the taking-out apparatus 20 is enabled.
- the fixed platen 12 is fixed to the center of the support frame 14 so as to face the movable platen 11, and supports the take-out device 20 on the top thereof.
- the stationary platen 12 detachably supports the second mold 42.
- the fixed platen 12 is fixed to the mold clamping machine 13 via a tie bar so that it can withstand the pressure of mold clamping at the time of molding.
- the mold clamping machine 13 is fixed to the end of the support frame 14.
- the mold clamping machine 13 supports the movable board 11 from the back via the power transmission part 15d of the opening / closing drive device 15 at the time of mold clamping.
- the opening / closing drive device 15 includes a slide guide 15a, a power transmission unit 15d, and an actuator 15e.
- the slide guide 15a supports the movable platen 11 and enables a smooth reciprocating movement in the advancing and retreating direction with respect to the fixed platen 12.
- the power transmission unit 15 d expands and contracts by receiving a driving force from an actuator 15 e that operates under the control of the control device 30.
- the movable platen 11 moves forward and backward freely with respect to the mold clamping plate 13, and as a result, the movable platen 11 and the fixed platen 12 move close to and away from each other, and the first die 41 is moved. And the second mold 42 are clamped and opened.
- the injection device 16 includes a cylinder 16a, a raw material storage unit 16b, a screw drive unit 16c, and the like.
- the injection device 16 operates at an appropriate timing under the control of the control device 30, and can inject molten resin from the resin injection nozzle 16d in a temperature-controlled state.
- the injection device 16 brings the resin injection nozzle 16d into contact with the sprue bush 77 shown in FIG. 1, and the flow path space FC (FIG. 2A).
- the molten resin in the cylinder 16a can be supplied at a desired timing.
- a mold temperature controller 46 attached to the injection molding machine 10 is temperature controlled by jackets 51 and 53 (see FIG. 1) formed in the first mold 41 and the second mold 42. Circulate the heat medium. Thereby, the temperature of the 1st metal mold
- the take-out device 20 includes a hand 21 that can hold the molded product MP and a three-dimensional drive device 22 that moves the hand 21 three-dimensionally.
- the take-out device 20 operates at an appropriate timing under the control of the control device 30, and remains in the first die 41 after the first die 41 and the second die 42 are separated and opened. It has the role of gripping the molded product MP and carrying it out.
- the control device 30 includes an opening / closing control unit 31, an injection device control unit 32, an ejector control unit 33, and a take-out device control unit 34.
- the opening / closing controller 31 enables the first mold 41 and the second mold 42 to be clamped and opened by operating the actuator 15e.
- the injection device controller 32 causes the resin to be injected at a desired pressure into the mold space formed between the first mold 41 and the second mold 42 by operating the screw driving unit 16c and the like.
- the ejector control unit 33 operates the ejector 45 to push the molded product MP remaining in the first mold 41 when the mold is opened from the first mold 41 to release the mold.
- the take-out device control unit 34 operates the take-out device 20 to grip the molded product MP remaining in the first mold 41 after mold opening and releasing and carry it out of the injection molding machine 10.
- FIG. 8 is a flowchart conceptually illustrating the operation of the molding apparatus 100 shown in FIG.
- the mold temperature controller 46 heats the surfaces of the first mold 41 and the second mold 42 to a temperature suitable for molding (step S10).
- the opening / closing drive device 15 is operated to advance the movable platen 11 to start mold closing (step S11).
- the movable platen 11 moves to the fixed platen 12 side to the die contact position where the first die 41 and the second die 42 are in contact with each other, and the die closing is completed.
- mold clamping is performed to clamp the first mold 41 and the second mold 42 with a necessary pressure (step S12).
- the injection device 16 is operated to inject molten resin into the mold space CV between the clamped first mold 41 and the second mold 42 at a necessary pressure. Injection is performed (step S13).
- the injection molding machine 10 maintains the resin pressure in the mold space CV.
- the mold temperature controller 46 appropriately heats the mold space CV and the flow path space FC (see FIG. 2A), and the molten resin can be quickly introduced into the mold space CV.
- the resin can be appropriately cooled in the mold space CV. Note that after the molten resin is introduced into the mold space CV, the molten resin in the mold space CV is gradually cooled by heat dissipation, so that the molten resin is solidified with the cooling and waits for the completion of molding (step) S14).
- the opening / closing drive device 15 is operated to open the mold to retract the movable platen 11 (step S15).
- the first mold 41 is retracted, and the first mold 41 and the second mold 42 are separated.
- the molded product MP that is, the lens LP is released from the second mold 42 while being held by the first mold 41.
- the ejector 45 is operated to cause the molded product MP to be ejected by the movable rods 67a and 67b (step S16). Thereby, as shown to FIG. 6 (B), the whole mold release is performed about molded product MP.
- the flange portion FL of the lens LP can be released from the outer peripheral mold 64b, and the runner portion RP can be released from the mold plate 61.
- an appropriate position of the molded product MP is taken out and supported by the hand 21 of the apparatus 20 to prevent the molded product MP from dropping.
- the ejector 45 is operated to move the movable rods 67a and 67b backward (step S17).
- the optical function part OP of the lens LP is released. That is, the optical function part OP can be released from the core mold 64a, and the release of the molded product MP from the first mold 41 can be completed.
- the take-out device 20 is operated to hold the molded product MP completely released from the first mold 41 with the hand 21 and carry it out (step S18).
- the ejecting pins 65 and 66 and the pin-shaped member 83 are returned to the retracted state in which the projecting pins 65 and 66 are retracted into the template 61 by the pins and air injection nozzles provided on the hand 21 of the take-out device 20. Can do.
- the protruding pins 65 and 66 and the pin-like member 83 can be returned to the retracted state in the template 61 by bringing the molded product MP close to the first mold 41 side by the hand 21.
- the projecting pins 65 and 66 and the pin-like member 83 can be returned to the retracted state by a return pin (not shown) provided in the second mold 42.
- the protruding pins 65 and 66 and the pin-like member 83 can be returned to the retracted state by air pressure or resin pressure supplied to the flow path space FC or the mold space CV.
- the pin-like member 83 as the return suppressing portion provided in the first die 41 causes the core die 64a as the central portion to retreat after the protruding operation.
- the core mold 64a is basically moved back in the direction of the axis AX.
- the lens LP can be released from the deep first transfer surface S1 without distortion. As a result, it is possible to avoid applying an excessive force to the lens LP locally as compared with the operation of peeling the lens LP, and to release the mold gently.
- the molding method of the present embodiment is compared to a case where the lens LP is strongly released from the lens LP by pushing the flange portion FL of the lens LP with a protruding pin or peeling the flange portion FL with a nail. The flange portion FL and its surroundings can be easily prevented from being deformed.
- the molding die according to the second embodiment is a modification of the first embodiment, and parts not specifically described are the same as those of the first embodiment.
- FIG. 9 (A) is a view for explaining the main part of the molding die of the second embodiment, and corresponds to FIG. 4 (A).
- a pipe 86 for air blowing is provided instead of the pin-shaped member 83.
- a plurality of pipes 86 are assembled on the inner side of the outer peripheral mold 64b, and the tip portions 86a of the pipes 86 are exposed to the third transfer surface S3 of the tip portion 82.
- the base side of each pipe 86 is connected to the pressurized air supply device of the ejector 45 through a movable rod 67a.
- the flange portion FL of the lens LP is released from the outer peripheral die 64b by the protrusion of the core die 64a, and the protrusion pin 65 is also released.
- the runner part RP is released from the template 61 by protruding the like.
- the lens LP is also retracted by the retraction of the core mold 64a.
- the flange portion FL of the lens LP approaches the outer peripheral mold 64b, the flange portion is caused by the air injected from the distal end portion 86a of the pipe 86 as a return suppressing portion. FL receives force in the protruding direction.
- the left and right protrusions can be made even with respect to the optical surface OS1 of the lens LP with a simple configuration.
- the runner portion RP is limited to only one side of the lens LP, it is possible to reduce costs without using an unnecessary resin material, and it is possible to omit unnecessary cutting work.
- the molding die according to the third embodiment is a modification of the first embodiment, and parts not specifically described are the same as those of the first embodiment.
- FIG. 9 (B) is a diagram for explaining the main part of the molding die of the third embodiment, and corresponds to FIG. 4 (A).
- an air chuck 87 is provided in place of the pin-shaped member 83.
- the air chuck 87 can be attached to the hand 21 of the take-out device 20, for example, and includes an annular suction pad 87a having a size corresponding to the flange portion FL of the lens LP.
- the flange portion FL of the lens LP is released from the outer peripheral die 64b by the protrusion of the core die 64a, as in FIG.
- the runner portion RP is released from the template 61 by the protrusion.
- the air chuck 87 as a return suppressing portion is brought close to the flange portion FL, and air suction is started from the suction pad 87a. Accordingly, the lens LP can be held on the air chuck 87 via the flange portion FL.
- the optical function part OP of the lens LP held by the air chuck 87 can be released from the core mold 64a, and the molded product MP is released from the first mold 41. Can be completed. In this case as well, it is possible to avoid applying an excessive force to the lens LP locally as compared with the operation of peeling the lens LP, and release can be made gentle.
- left and right can be evenly attracted to the optical surface OS1 of the lens LP with a simple configuration.
- the runner portion RP is limited to only one side of the lens LP, it is possible to reduce costs without using an unnecessary resin material, and it is possible to omit unnecessary cutting work.
- the molding die according to the fourth embodiment is a modification of the first embodiment, and parts not specifically described are the same as those of the first embodiment.
- FIG. 9C is a diagram for explaining a main part of the molding die of the fourth embodiment, and corresponds to FIG.
- the molded product MP not only the runner portion RP is provided on a part of the outer periphery of the lens LP via the gate portion GP, but also an extension portion DP having a similar shape on the opposite side of the gate portion GP.
- the projecting pin 65 projecting to the movable rod 67b is increased.
- the flange portion FL of the lens LP is released from the outer peripheral die 64b by the protrusion of the core die 64a, as in FIG.
- the runner part RP and the extension part DP are released from the template 61 by the protrusion.
- FIG. 9C when the core die 64a is retracted, the core die 64a is supported by the runner portion RP and the extension portion DP that are locked to the protruding pin 65 as the return suppressing portion in which the retracting is suppressed.
- the lens LP can be held in a protruding state.
- the optical function part OP of the lens LP can be released from the core mold 64a, and the release of the molded product MP from the first mold 41 can be completed. In this case as well, it is possible to avoid applying an excessive force to the lens LP locally as compared with the operation of peeling the lens LP, and release can be made gentle.
- one extension portion DP is provided.
- two or more extension portions DP are provided, and the two or more extension portions DP and the runner portion RP are provided correspondingly.
- the optical function part OP of the lens LP can be released by preventing the extension part DP and the runner part RP from retreating when the core mold 64a is retreated by the projecting pin 65.
- the molding die according to the fifth embodiment is a modification of the first embodiment, and parts not specifically described are the same as those of the first embodiment.
- FIG. 10 (A) is a diagram for explaining a main part of the molding die of the fifth embodiment, and corresponds to FIG. 4 (A).
- an adjusting member 88 is provided between the core die 64a and the movable rod 67a for precise position adjustment in the axis AX direction of the core die 64a.
- FIG. 10 (B) is a diagram for explaining an example in which the molding die shown in FIG. 10 (A) is modified.
- a cylindrical dividing member 89 is disposed around the adjustment member 88.
- the split member 89 is movable in the direction of the axis AX independently of the adjustment member 88, and is driven by the movable rod 67a to advance together with the core die 64a to project the pin-like member 83.
- the split member 89 operates in the same manner as the pin-like member 83. Even if the movable rod 67a is retracted, the split member 89 is held at the protruding position, and does not return to the original state unless an external force exceeding a predetermined value is applied.
- FIG. 10 (C) is a diagram for explaining an example in which the molding die shown in FIG. 10 (B) is modified.
- a ball-shaped support 89 a is disposed between the dividing member 89 and the adjusting member 88.
- the support 89a is fitted in a groove provided on the side surface of the adjustment member 88, and functions as a bearing that assists the smooth movement of the dividing member 89.
- the molding die according to the sixth embodiment is a modification of the first embodiment, and parts that are not particularly described are the same as those in the first embodiment.
- FIG. 11 is a partial cross-sectional view for explaining the structure of the first mold 41 in the molding mold according to the sixth embodiment.
- the projecting pin 165 provided additionally can operate independently of the other projecting pins 65, 66 and the like, and after the other projecting pins 65, 66 are ejected by the movable rod 67b, it is movable at a predetermined timing.
- the rod 167b can be pushed out.
- the ejection pin 165 functions as an additional separation mechanism, and has a role of moving the molded product MP including the lens LP again in the direction of the ejection operation after the mold release from the first mold 41 is completed.
- the molding die according to the seventh embodiment is a modification of the first embodiment, and parts not specifically described are the same as those of the first embodiment.
- FIG. 12 is a front view for explaining an injection molding machine 210 incorporating the molding die 40 of the seventh embodiment.
- the injection molding machine 210 is a vertical molding machine, and the first mold 41 is attached to the stationary platen 211 and the second mold 42 is attached to the movable platen 212.
- the fixed platen 211 does not move during molding, but the movable platen 212 is driven by an unillustrated opening / closing drive device and moves up and down together with the injection device 16.
- the present invention has been described based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications are possible.
- the shape of the mold space CV provided in the injection mold constituted by the second mold 42 and the first mold 41 is not limited to the illustrated shape, and can be various shapes. That is, the shape of the mold space CV formed by the core molds 64a, 74a and the like is merely an example, and can be appropriately changed according to the use of the lens LP.
- the use of the lens LP is not limited to compatibility, and may be, for example, a BD alone.
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Abstract
Description
以下、本発明の第1実施形態である成形金型について、図面を参照しつつ詳細に説明する。
以下、第2実施形態に係る成形金型等について説明する。なお、第2実施形態に係る成形金型等は、第1実施形態を変形したものであり、特に説明しない部分については、第1実施形態と同様であるものとする。
以下、第3実施形態に係る成形金型等について説明する。なお、第3実施形態に係る成形金型等は、第1実施形態を変形したものであり、特に説明しない部分については、第1実施形態と同様であるものとする。
以下、第4実施形態に係る成形金型等について説明する。なお、第4実施形態に係る成形金型等は、第1実施形態を変形したものであり、特に説明しない部分については、第1実施形態と同様であるものとする。
以下、第5実施形態に係る成形金型等について説明する。なお、第5実施形態に係る成形金型等は、第1実施形態を変形したものであり、特に説明しない部分については、第1実施形態と同様であるものとする。
以下、第6実施形態に係る成形金型等について説明する。なお、第6実施形態に係る成形金型等は、第1実施形態を変形したものであり、特に説明しない部分については、第1実施形態と同様であるものとする。
以下、第7実施形態に係る成形金型等について説明する。なお、第7実施形態に係る成形金型等は、第1実施形態を変形したものであり、特に説明しない部分については、第1実施形態と同様であるものとする。
11 可動盤
12 固定盤
15 開閉駆動装置
16 射出装置
20 取出し装置
21 ハンド
30 制御装置
40 成形金型
41 第1金型
42 第2金型
45 エジェクタ
61 型板
61b ランナ凹部
61e,61f,61g 貫通孔
62 受板
63 取付板
64a,74a コア型
64b,74b 外周型
65,66 突き出しピン
67a,67b 可動ロッド
69 進退機構部
71 型板
71b ランナ凹部
71e 貫通孔
72 取付板
77 スプルブッシュ
82 先端部
82a 挿通孔
83 ピン状部材
84 係止部材
84a 凹部
84b ボール
84d 磁石
84e 内壁部
84g 弾性部材
84h プランジャ
86 パイプ
87 エアチャック
87a 吸着パッド
88 調整部材
89 分割部材
89a 支持体
100 成形装置
CV 型空間
CV1 本体空間
CV2 フランジ空間
SP スプル部
DP 延長部
FC 流路空間
GS ゲート部分
MP 成形品
LP レンズ
OP 光機能部
FL フランジ部
GP ゲート部
RP ランナ部
OS1,OS2 第1,2光学面
PS1,PS2 パーティング面
S1,S2,S3,S4 第1~第4転写面
Claims (13)
- レンズのうち凹凸形状を有する光学面を形成するための第1転写面を設けた中心部と、型閉じ時に前記中心部の周囲に配置される周辺部と、を有する第1金型と、
前記第1転写面よりも浅く形成された第2転写面を設けた第2金型と、
を備え、
前記第1金型は、型開き後に前記中心部を前記周辺部に対して相対的に前記第2金型側に前進させる突き出し動作が可能であり、
突き出し動作後に前記中心部を後退させる際にレンズの後退を抑える戻り抑制部を備えることを特徴とする成形金型。 - 前記戻り抑制部は、前記周辺部に組み込まれた複数のピン状部材を有し、
前記複数のピン状部材は、突き出し動作時に前記中心部とともにそれぞれ前進し、前記中心部を後退させる際に前記周辺部側に保持される力を受けてそれぞれ後退を抑制されることを特徴とする請求項1に記載の成形金型。 - 前記複数のピン状部材は、前記周辺部に対してそれぞれ変位可能に埋め込まれており、
前記戻り抑制部は、前記周辺部と前記複数のピン状部材との間に前記複数のピン状部材の後退を所定以上の力で阻止する係止部材を有することを特徴とする請求項2に記載の成形金型。 - 突き出し動作時に前記中心部とともに前進することによりレンズから延びるランナ部を突き出すとともに、前記中心部を後退させる際に前記ランナ部の後退を抑えるランナ突き出し部材を備えることを特徴とする請求項1から請求項3までのいずれか一項に記載の成形金型。
- 前記戻り抑制部は、空気圧を利用してレンズを前記中心部から離間させることを特徴とする請求項1に記載の成形金型。
- レンズからは、複数の突起部がパーティングラインに沿って周囲に延びており、
前記戻り抑制部は、前記中心部を後退させる際に前記複数の突起部の後退を阻止することによってレンズを前記中心部から離間させることを特徴とする請求項1に記載の成形金型。 - レンズを前記中心部から離型させた後にレンズを突き出し動作の方向に移動させる離間機構を備えることを特徴とする請求項1から請求項6までのいずれか一項に記載の成形金型。
- 前記中心部は、レンズの光機能部を形成し、前記周辺部は、レンズのフランジ部を形成することを特徴とする請求項1から請求項7までのいずれか一項に記載の成形金型。
- 前記第2金型は、固定的に支持され、前記第1金型は、水平方向に移動することによって前記第2金型との間で型開閉を行うことを特徴とする請求項1から請求項8までのいずれか一項に記載の成形金型。
- 前記第1金型は、固定的に支持され、前記第2金型は、鉛直方向に移動することによって前記第1金型との間で型開閉を行うことを特徴とする請求項1から請求項8までのいずれか一項に記載の成形金型。
- レンズのうち凹凸形状を有する光学面を形成するための第1転写面を設けた中心部と、型閉じ時に前記中心部の周囲に配置される周辺部と、を有する第1金型と、前記第1転写面よりも浅く形成された第2転写面を設けた第2金型とを合わせることによって型空間を形成した状態で、前記型空間中においてレンズを成形する第1工程と、
前記第1金型と前記第2金型とを離間させる型開きにより、前記第2金型からレンズを離型する第2工程と、
前記第2工程後に前記中心部を前記周辺部に対して相対的に前記第2金型側に前進させる第3工程と、
前記第3工程後に前記中心部を後退させるとともに、戻り抑制部によってレンズの後退を抑えることにより前記中心部からレンズを離型させる第4工程と、
を備えることを特徴とする成形方法。 - 前記型空間中で成形されるレンズは、光ピックアップ用の対物レンズであり、
前記第1金型によって形成され前記第1転写面に対応する第1光学面は、光源側に配置され、前記第2金型によって形成され前記第2転写面に対応する第2光学面は、光情報記録媒体側に配置されることを特徴とする請求項11に記載の成形方法。 - 前記型空間中で成形されるレンズは、NA0.75以上であることを特徴とする請求項12に記載の成形方法。
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CN102527110A (zh) * | 2011-12-27 | 2012-07-04 | 杭州兴源过滤科技股份有限公司 | 可控式高密度恒温隔膜滤板及成型方法 |
KR101373201B1 (ko) * | 2012-05-24 | 2014-03-13 | 주식회사 엘엠에스 | 렌즈 제조용 금형 장치 및 이를 이용한 렌즈 제조 방법 |
CN104227988A (zh) * | 2013-06-11 | 2014-12-24 | 汉达精密电子(昆山)有限公司 | 倒灌进胶结构 |
KR20170000888U (ko) * | 2015-08-31 | 2017-03-08 | 에버레디 프리시전 인드. 코프. | 광학부재의 금형 |
JP2017185759A (ja) * | 2016-04-08 | 2017-10-12 | キヤノン株式会社 | プラスチックレンズおよびその製造方法 |
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CN102527110A (zh) * | 2011-12-27 | 2012-07-04 | 杭州兴源过滤科技股份有限公司 | 可控式高密度恒温隔膜滤板及成型方法 |
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KR20170000888U (ko) * | 2015-08-31 | 2017-03-08 | 에버레디 프리시전 인드. 코프. | 광학부재의 금형 |
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JP2017185759A (ja) * | 2016-04-08 | 2017-10-12 | キヤノン株式会社 | プラスチックレンズおよびその製造方法 |
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