JP6485449B2 - Mold for optical element and method for manufacturing optical element - Google Patents

Description

  The present invention relates to a molding die for an optical element incorporated in an imaging optical system, an optical pickup device, and the like, and a method for manufacturing an optical element using the molding die.

  With the increase in accuracy of optical elements, molding molds are also required to have high accuracy. For example, in order to eliminate the tilt (tilt) of the optical surface that causes coma aberration in the lens that is an optical element, it is necessary to adjust the tilt (axis tilt) of the nesting of the molding die.

In order to adjust the tilt of the nesting of the molding die for injection molding, there is one provided with a tilt adjustment mechanism that tilts while supporting the core portion facing the bottom surface of the core portion having an optical surface. In this tilt adjustment mechanism, the tilt amount and direction of the core portion can be adjusted by changing the sizes of the three steel balls that support the mold parts for the optical surface (see Patent Document 1). Here, the nesting of the molding die of Patent Document 1 is thick on the base side and is incorporated from the opposite side of the molding surface. Therefore, it is necessary to perform tilt adjustment on the opposite side of the molding surface.
As another molding die, there is one in which three piezoelectric elements are provided between a nest and a sleeve (peripheral mold part) (see Patent Document 2). In the molding die of Patent Document 2, the tilt of the molded product is detected, and the piezoelectric element is expanded or compressed in accordance with the detected tilt amount to adjust the tilt of the nesting.
As another molding die, there is one in which a mold part is fixed in a groove portion of the mold plate so that the tapered surfaces are matched with each other by using wedge action tightening (patent) Reference 3). In the molding die of Patent Document 3, since the mold parts can be taken in and out from the die mating surface, the workability is improved and the reproducibility in the die mating surface (parting surface) direction is also obtained.

However, in the molding die of Patent Document 1, since the tilt amount is adjusted by three steel balls, there is a possibility that the height adjustment between the three points may be complicated. Further, since there is a possibility that the steel ball is deformed by the injection pressure at the time of injection molding, there is a concern about reproducibility and stability of molding. Furthermore, the tilt adjustment is performed on the opposite side of the molding surface, and the workability is not so good.
Further, in the molding die of Patent Document 2, in order to fix the nesting, it is necessary to store the nesting in the sleeve from the base side, and the nesting cannot be easily taken out at the time of tilt adjustment or maintenance, and workability is not so good. . Further, since the nest is tilted, a clearance is formed between the sleeve and the sleeve, and it is difficult to reproduce the position in the direction along the mold matching surface.
Further, in the molding die of Patent Document 3, when the perpendicularity of the abutting surface that is in contact with the side surface of the mold part disposed in the groove portion of the mold plate is poor, the nesting is tilted with respect to the die matching surface. There is a fear.

JP 2007-301744 A JP-A-1-97617 JP 2003-1667 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a molding die that can easily adjust and change the nesting and can adjust the tilt of a molded product with high precision in a lens having a strict optical performance standard such as a pickup lens or a compound eye lens. And

  Another object of the present invention is to provide a method for producing an optical element using the above molding die.

  In order to achieve the above object, a molding die for an optical element according to the present invention includes a nesting provided with a forming surface corresponding to an optical surface and a peripheral surface on one side of the optical element, and a template for holding the nesting. And a fixing tool for fixing the nest to the concave portion of the template from the mold matching surface side, the fixing tool has a tapered portion on the side in contact with the contact portion provided on the top of the nest, It has a chamfered shape that faces the taper part of the fixture as a contact part, and the taper angle of the taper part of the fixture is larger than the taper angle of the contact part of the nest. Is fixed in one place to perform positioning in the direction along the mold matching surface of the insert with respect to the mold plate and to adjust the inclination with respect to the mold matching surface.

  In the above-mentioned molding die, positioning of the nest and tilt adjustment can be performed by attaching the fixture from the die matching surface side. For this reason, the molding die is excellent in workability and maintenance properties for incorporating a nest into a template. Thereby, in a lens with a strict optical performance standard such as a pickup lens or a compound eye lens, the tilt of the molding surface of the molded product can be adjusted with high accuracy, and a highly accurate optical element can be obtained. In particular, the taper angle of the taper portion of the fixing tool is made larger than the taper angle of the contact portion of the nest and is brought into contact with the contact portion of the nest on the die mating surface side in one place, so that the recess of the template Even if the inner side surface is not vertical, the back side end of the nest can follow the bottom surface of the recess, and the tilt of the nest can be suppressed. That is, even when the verticality of the concave portion of the template is poor, by appropriately selecting the taper angle of the taper portion of the fixture or the contact portion of the nest, the manner in which the fixture and the nest are brought into contact with each other can be changed. The posture can be adjusted.

  The optical element manufacturing method according to the present invention includes a transfer portion having a nest provided with a forming surface corresponding to an optical surface and a peripheral surface on one side of the optical element, and a frame portion having a template for holding the nest. A method of manufacturing an optical element using a fixing tool that fixes a nest to a concave portion of a template from the mold matching surface side, and the fixing tool is disposed on a side in contact with a contact portion provided on an upper portion of the nest. Has a taper part, and the nest has a chamfered shape that faces the taper part of the fixture as a contact part, and the taper angle of the taper part of the fixture is larger than the taper angle of the contact part of the nest. The tool performs positioning in a direction along the mold matching surface of the nesting with respect to the template and inclination adjustment with respect to the mold matching surface.

  In the above manufacturing method, positioning of the nest and tilt adjustment can be performed by attaching the fixture so as to be inserted from the mold matching surface side. Thereby, in an optical element such as a lens having a strict optical performance standard such as a pickup lens or a compound eye lens, the tilt of the molding surface of the molded product can be adjusted with high accuracy, and a high-precision optical element can be obtained. it can. In particular, by making the taper angle of the taper portion of the fixture larger than the taper angle of the contact portion of the nest, it can be brought into contact with the contact portion of the nest at one place on the die matching surface side, Even if the inner side surface of the recess is not vertical, the back side end of the insert can follow the bottom surface of the recess, and the tilt of the insert can be suppressed.

It is a conceptual diagram explaining the shaping | molding apparatus incorporating the shaping die for optical elements which concerns on 1st Embodiment. 2A and 2B are side cross-sectional views illustrating a molding die. It is side sectional drawing of the optical element which is a molded article manufactured with a shaping die. 4A is a plan view of the first mold of the molding dies as seen from the die mating surface, FIG. 4B is a cross-sectional view of the first mold of FIG. 4A taken along the line AA, and FIG. It is a notional enlarged side sectional view of the periphery of the fixture in the mold. It is a conceptual diagram explaining the removal method of a fixing tool. 6A to 6D are conceptual diagrams illustrating a method for attaching a fixture. 7A is a conceptual cross-sectional view illustrating a molding die for an optical element according to the second embodiment, and FIGS. 7B and 7C are diagrams illustrating a rotating base in the molding die of FIG. 7A. 7D is a diagram for explaining a method of using a molding die. FIG. 8A is a plan view for explaining a molding die for an optical element according to the third embodiment, and FIG. 8B is a diagram for explaining a position adjusting spacer attached to a nest in the molding die of FIG. 8A. FIG. 8C is a diagram for explaining nesting. FIG. 9A is a plan view for explaining an optical element molded using the molding die for an optical element according to the fourth embodiment, and FIG. 9B is a cross-sectional view of the optical element in FIG. 9A. It is the elements on larger scale of the shaping die for optical elements concerning a 4th embodiment.

[First Embodiment]
Hereinafter, a molding die for an optical element and a method for manufacturing the optical element according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a 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, and a control apparatus that comprehensively controls the operation of each part constituting the molding apparatus 100. 30.

  The injection molding machine 10 is a horizontal molding machine and includes a molding die 40, a fixed platen 11, a movable platen 12, an opening / closing drive device 15, and an injection device 16. The injection molding machine 10 is also provided with a mold temperature controller 47 and the like. The injection molding machine 10 clamps both molds 41 and 42 by sandwiching a first mold 41 and a second mold 42 constituting the molding mold 40 between the fixed platen 11 and the movable platen 12. This enables molding.

  The inner side 11a of the fixed platen 11 fixed on the support frame 14 faces the inner side 12a of the movable platen 12, and supports the first mold 41 in a detachable manner. The fixed platen 11 is formed with an opening 11b through which a later-described nozzle 16d is passed. A take-out device 20 is supported on the upper part of the fixed platen 11 so that the molded product MP can be taken out.

  The movable platen 12 is supported by the linear guide 15a so as to be movable back and forth with respect to the fixed platen 11. The inner side 12a of the movable platen 12 faces the inner side 11a of the fixed platen 11, and supports the second mold 42 in a detachable manner. Note that an ejector driving unit 45 is incorporated in the movable platen 12.

  The opening / closing drive device 15 is supported by the mold clamping plate 13 and includes a linear guide 15a, a power transmission unit 15d, and an actuator 15e. 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. Thereby, the fixed platen 11 and the movable platen 12 can be brought close to or away from each other, and the first mold 41 and the second mold 42 can be clamped or 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 a molten resin (injected melt) in a state of temperature control from the resin injection nozzle 16d.

  A mold temperature controller 47 provided along with the injection molding machine 10 circulates a temperature-controlled heat medium in both molds 41 and 42. Thereby, the temperature of both metal mold | dies 41 and 42 can be kept at an appropriate temperature at the time of shaping | molding.

  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 control unit 31 enables the molds 41 and 42 to be closed, clamped, opened, and the like by operating the actuator 15e. The injection device control unit 32 causes the molten resin to be injected at a desired pressure into the cavity CV (see FIG. B) formed between the molds 41 and 42 by operating the screw driving unit 16c and the like. The ejector control unit 33 operates the ejector driving unit 45 to push out the molded product MP remaining in the second mold 42 when the mold is opened from the second mold 42 to release the mold. The take-out device control unit 34 operates the take-out device 20 to hold the molded product MP remaining in the second mold 42 after the mold opening and releasing by the hand 21 and carry it out of the injection molding machine 10.

  Hereinafter, the molding die 40 will be described in detail. As shown in FIG. 2A and the like, the second mold 42 on the movable side of the molding die 40 can be reciprocated in the AB direction by the mechanism shown in FIG. As shown in FIG. 2B, the second mold 42 is moved toward the first mold 41 on the fixed side, and both molds 41, 42 are mold-matched with the mold-matching surfaces PS1, PS2 and clamped. In addition, a cavity CV for molding the optical element and a channel space FC which is a channel for supplying molten resin to the cavity CV are formed.

  As shown in FIG. 2B and the like, a cavity CV that is a space between the first mold 41 and the second mold 42 is illustrated in a simplified manner, but a lens as an optical element that is a molded product It corresponds to the shape of LP (see FIG. 3).

  As shown in FIG. 3, the lens LP molded between the molds 41 and 42 is made of plastic and has a central portion LPa as an optical functional portion having an optical function, and from the central portion LPa to the outer diameter direction. And an annular flat flange portion LPb. This lens LP is a single lens constituting an imaging lens incorporated in, for example, a mobile phone, a smartphone, or the like. That is, an imaging lens can be obtained by combining and laminating a plurality of lenses LP and another lens (not shown) and bonding the lenses together. At this time, it is conceivable to use the flange portion LPb to join the lenses, but in the case of the present lens LP, the flange portion LPb is precisely formed by a mold portion common to the center portion LPa as described later. Therefore, the lens LP can be assembled while adjusting the tilt so that the optical axis OA of the lens LP is precisely parallel to the optical axis of another lens (not shown). The lens LP molded between the molds 41 and 42 is not limited to the imaging lens, and can be an objective lens having a high NA of NA 0.7 or more incorporated in the optical pickup device. The objective lens can be, for example, a lens satisfying a standard such as NA 0.85 for a light beam having a wavelength for BD (blu-ray disc), or BD, DVD (digital versatile disc), and CD (compact disc). ) For a three-wavelength light beam, a three-wavelength compatible objective lens satisfying the standard can be obtained.

  Referring back to FIG. 2A, the first mold 41 is a fixed mold, and a mold portion 60 disposed on the inner side, that is, the mold mating surface PS1 side, and an attachment disposed on the outer side, that is, the fixed platen 11 side in FIG. Plate 64. Among these, the mold part 60 has a divided structure divided into a plurality of parts. The mold part 60 includes a plurality of inserts 60a, a mold plate 60b, a receiving plate 60c, and a plurality of fixtures FX (see FIGS. 4A and 4B). In the mold part 60, the template 60b and the receiving plate 60c are fixed to each other with a bolt or the like (not shown).

  The insert 60a of the mold part 60 is a transfer part TS1 for transferring an optical surface or the like. As shown in FIG. 4A, the insert 60a has a quadrangular prism shape when viewed from the mold matching surface PS1. At the tip of the insert 60a, an optical transfer surface 52a and a flange transfer surface 52b are provided as a forming surface 51a for defining the cavity CV. The optical transfer surface 52a is a curved concave surface formed at the tip of the insert 60a, and serves as a transfer surface for molding one optical surface SO1 of the central portion LPa constituting the lens LP. The flange transfer surface 52b is an annular flat surface perpendicular to the axis AX formed at the tip of the insert 60a, and is a transfer surface for molding one flange surface (peripheral surface) SF1 of the flange portion LPb constituting the lens LP. is there. Since the flange surface SF1 is formed as a continuous surface by the forming surface 51a of the insert 60a that is also used for forming the optical surface SO1, the inclination and the like with respect to the optical surface SO1 can be accurately set. Thus, the flange surface SF1 can be used as a joint surface when the lens LP is joined to another lens (not shown), and high-precision joining is possible. That is, since the flange surface SF1 can be precisely formed perpendicular to the optical axis OA, not only the tilt adjustment of the lens LP alone is possible, but also each lens constituting a lens group in which a plurality of lenses are stacked. It is also possible to reduce the relative tilt between the lenses. Further, a concave portion for transferring a gate and a runner is formed at an appropriate position on the front end surface of the insert 60a and outside the flange transfer surface 52b. Each nest 60a is fixed to the template 60b by a fixture FX, which will be described later, and has a contact portion ZU facing the fixture FX. This contact portion ZU is formed at one location (XY direction in plan view) on the outer periphery on the mold matching surface PS1 side, and contacts the tapered portion TL of the fixture FX. The contact portion ZU is a chamfered shape or a chamfered portion formed in the insert 60a so as to face the tapered portion TL formed in a slope shape on the fixture FX. More specifically, the contact portion ZU is a surface in the XY direction in a plan view. It is a notch having such a surface. The contact portion ZU is inclined at a taper angle α so as to be closer to the center toward the distal end side of the insert 60a.

  A template 60b shown in FIG. 2A is a metal plate-like member, and is a frame portion FR1 that holds the insert 60a of the transfer portion TS1 from the periphery. The template 60b includes a plurality of nesting holes 61a into which the plurality of nestings 60a are inserted, and sprue holes or ports 61b for supplying molten resin from the outside to the inside. Further, the template 60b has an end face 61c that forms the mold matching surface PS1. As shown in FIGS. 4A and 4B and the like, the nesting accommodation hole 61a is a square columnar hole that is slightly larger than the nesting 60a. The template 60b is formed with a step portion 61e into which the fixture FX is fitted so as to partially cut out the upper portion of the nesting accommodation hole 61a. At the bottom of the stepped portion 61e, a screw hole 92 that can be screwed with a fixing bolt MT1 for fixing the fixing tool FX to the template 60b extends along the axis in the Z direction.

  The receiving plate 60c is a metal plate-like member, is disposed between the template 60b and the mounting plate 64, and supports the template 60b from behind. Similar to the template 60b, the receiving plate 60c includes a sprue port 61d for supplying molten resin from the outside to the inside.

  In addition, although illustration is abbreviate | omitted in the inside of the metal mold | die part 60, in order to maintain the temperature of a metal mold | die at the time of shaping | molding and taking out, the heat medium from the metal mold temperature controller 47 of FIG. 1 is distribute | circulated. A temperature control channel, a thermometer for temperature monitoring, a heater for heating, and the like are incorporated. The temperature channel and the like are connected to the mold temperature controller 47.

  The mounting plate 64 is a metal plate-like member, and supports the mold part 60 from behind. The mounting plate 64 has sprue ports 64b connected so as to extend the sprue ports 61b and 61d provided in the mold plate 60b and the receiving plate 60c of the mold part 60. A sprue port portion 65 is formed on the base side of the sprue port 64b to contact the tip of the nozzle 16d of the injection device 16.

  4A and 4B, the fixture FX is a mold member for fixing the transfer portion TS1, that is, the insert 60a, to the mold plate 60b. The fixture FX is fixed from the mold matching surface PS1 side to a stepped portion 61e provided so as to expand the recess 63a defined by the mold plate 60b and the receiving plate 60c. The upper end of the fixture FX is recessed from the mold matching surface PS1, and is arranged so as to be embedded behind the mold matching surface PS1. Thereby, it is possible to prevent the fixture FX from interfering with the die mating surface PS2 when the molding die 40 is clamped. Here, the recess 63a is a hole defined by the nested accommodation hole 61a of the template 60b and the receiving plate 60c. The fixture FX not only simply fixes the nest 60a by contacting the chamfered contact portion ZU provided on the top of the nest 60a, but also in a direction along the die mating surface PS1 of the nest 60a with respect to the template 60b. Positioning and tilt adjustment with respect to the mold matching surface PS1 are performed. The fixture FX is provided to correspond to a notch in the corner of the upper part (on the mold matching surface PS1 side) of the quadrangular prism shape of the insert 60a. Therefore, the insert 60a is supported by the bottom surface 63b, which can be said to be a relatively wide portion in the recess 63a. Further, as described above, since the insert 60a has a prismatic shape (specifically, a quadrangular prism shape), at least a part of the side surfaces 63c of the rectangular concave portion 63a provided for the storage thereof is used. Is retained. Therefore, the insert 60a is stably fixed to the recess 63a of the template 60b. The fixture FX has a shape close to a cylinder as a whole, but has a tapered portion TL as a notch on the side of the insert 60a that contacts the contact portion ZU. The taper portion TL is inclined at a taper angle θ so as to be closer to the center toward the base side of the fixture FX or the back side of the mold. At substantially the center of the fixture FX, a screw hole 91 for screwing with the extraction bolt MT2 (see FIG. 5) for extracting the fixture FX from the template 60b extends along the axis in the Z direction. The screw hole 91 of the fixture FX is larger than the outer diameter of the screw hole 92 of the template 60b and the fixing bolt MT1.

The fixture FX applies a biasing force so that the back side end 62a of the nest 60a follows the bottom surface 63b of the recess 63a, and fixes the nest 60a in one place from the mold matching surface PS1 side. At this time, the fixing tool FX is provided with a tapered portion TL, and is brought into contact with the contact portion ZU of the insert 60a at one position, so that the insert 60a can be provided even if the side surface 63c of the recess 63a is not perpendicular to the bottom surface 63b. The back side end 62a follows the bottom surface 63b of the recess 63a, so that the tilt of the nest 60a can be suppressed. In other words, even when the perpendicularity of the recess 63a is poor, by appropriately selecting the taper angles θ and α of the fixture FX or the insert 60a, the contact between the fixture FX and the insert 60a is set appropriately, and the insert 60a Can be adjusted. Thereby, the inclination of the nesting 60a can be adjusted to 1 minute or less. Here, the taper angle θ of the taper portion TL is based on a line parallel to the axis AX. Specifically, as shown in FIG. 4C, the taper angle θ is parallel to the line MX1 parallel to the axis AX (the normal line perpendicular to the end face of the fixture FX on the mold matching surface PS1 or the axis HX of the screw hole 91). The angle between the straight line) and the surface of the tapered portion TL. The taper angle α of the nest 60a is an angle between the line MX2 parallel to the axis AX and the surface of the contact portion ZU. As a result, the tapered portion TL contacts the contact portion ZU on the front side, but is separated from the contact portion ZU on the back side.
In the above, the cross-sectional shape of the contact portion ZU and the tapered portion TL has been described focusing on the cross-sectional shape in the diagonal direction of the nest 60a. The angular relationship between these cross-sectional shapes is the axis HX extending in the Z direction of the nest 60a. It is substantially the same in another cross section passing through. That is, the gap SP that spreads in a wedge shape on the receiving plate 60c side is formed substantially uniformly along the tapered portion TL of the fixture FX. As a result, the surface of the contact portion ZU and the surface of the taper portion TL are specifically cylindrical curved surfaces that are similar to each other, and the contact portion ZU and the taper portion TL are positioned at the front side position CX1. In contact at one place.
In addition, although the surface of the contact part ZU is a curved surface (specifically cylindrical curved surface) according to the surface of the taper part TL, it can also be made into a plane. When the surface of the contact portion ZU is a flat surface, the surface of the taper portion TL is also a flat surface, but the surface of the taper portion TL can be a gentle convex surface close to a flat surface.

  The fixture FX for fixing the insert 60a having the contact portion ZU set to a specific taper angle α is selected from a plurality of members having substantially the same shape except that the angle of the taper portion TL is different. . Thus, by preparing a plurality of fixtures FX having substantially the same shape except that the taper angle θ is different, selecting a suitable fixture FX from these and attaching it to the stepped portion 61e, the contact portion ZU of the nest 60a The fixture FX corresponding to the shape can be selected as appropriate, and precise tilt adjustment can be performed.

Hereinafter, a method for attaching, removing, and selecting the fixture FX will be described.
First, the fixture FX is attached to the template 60b. As shown in FIG. 4B, the insert 60a is inserted into the recess 63a from the mold matching surface PS1 side. Next, the fixture FX is fitted into the stepped portion 61e of the template 60b. At this time, the back side end 62a of the insert 60a is in a state of following the bottom surface 63b of the recess 63a by its own weight. Next, the fixing tool FX is fixed to the template 60b by the fixing bolt MT1. That is, by screwing the fixing bolt MT1 into the screw hole 92 of the template 60b, the position of the insert 60a is fixed with respect to the template 60b.

  Thereafter, when the fixture FX is removed from the template 60b for maintenance or the like, first, the fixing bolt MT1 is extracted from the fixture FX. Next, as shown in FIG. 5, the extraction bolt MT2 is screwed into the fixture FX. Specifically, the extraction jig K is placed above the fixture FX, the extraction bolt MT2 is inserted from the extraction jig K side, and screwed into the screw hole 91 of the fixture FX so as to remove the wedge. Fixing tool FX rises and fixing is released. Next, the extraction jig K is removed together with the extraction bolt MT2 and the fixture FX.

  When the taper angle θ of the taper portion TL of the fixture FX is appropriately larger than the taper angle α of the contact portion ZU of the nest 60a, the taper portion TL of the fixture FX and the contact portion ZU of the nest 60a are matched to each other. At least line contact is made at the position CX1 on the surface PS1 side (upper side), and a gap SP is generated on the receiving plate 60c side (see FIG. 4C). Further, the nest 60a also makes at least line contact with the two side surfaces 63c of the recess 63a at the position CX2 on the mold matching surface PS1 side. In this case, as shown in FIG. 6A, the downward component force received by the insert 60a is in a balanced state. Therefore, as shown in FIG. 6B, the rotational moments with respect to the two fulcrums of the back side end 62a of the nest 60a are balanced, and the nest 60a changes the posture in which the back side end 62a of the nest 60a follows the bottom surface 63b of the recess 63a. And firmly fixed in the template 60b. On the other hand, when the taper angle θ of the fixture FX is the same as the taper angle α of the contact portion ZU of the insert 60a, the taper portion TL of the fixture FX and the contact portion ZU of the insert 60a are in surface contact and a gap is generated. No state. In this case, as shown in FIG. 6C, the downward component force received by the insert 60a is increased on the fixture FX side, and the balance is lost. Therefore, among the rotational moments with reference to the two fulcrums of the back side end 62a of the insert 60a, the clockwise rotational moment related to the fulcrum on the side away from the fixture FX becomes strong. As a result, a clockwise rotational moment with the contact portion on the upper side between the nesting 60a and the side surface 63c of the recess 63a acting as a fulcrum B1 works, and as shown in FIG. 6D, the nesting 60a extends along the side surface 63c of the recess 63a. Tilts. The side surface 63c of the recess 63a tends to wear in the direction in which the root side expands due to continuous use. Therefore, in the template 60b having the side surface 63c in which the root side is expanded by use, when the nesting 60a follows the side surface 63c, the nesting direction of the nesting 60a becomes larger. From the above, since the posture of the insert 60a is made to follow the bottom surface 63b instead of the side surface 63c when the insert 60a is fixed, the fixture FX has a taper that is appropriately larger than the taper angle α of the contact portion ZU of the insert 60a. It is desirable to select one having a tapered portion TL having an angle θ. However, if the taper angle θ of the fixture FX is too large, the nesting 60a is tilted counterclockwise. Therefore, the fixture FX having a taper angle θ that makes the tilt of the nesting 60a zero is appropriately selected. Note that the side surface a1 of the fixture FX and the inner side surface 63d of the stepped portion 61e extend in parallel to the axis AX.

  Returning to FIG. 2A, the second mold 42 is a movable mold, and is a mold portion 70 disposed on the inner side, that is, the mold matching surface PS2 side, and an attachment disposed on the outer side, that is, the movable platen 12 side in FIG. A plate 74 and an ejector member 75 formed to be embedded in the mounting plate 74 are provided. Among these, the mold part 70 has a divided structure divided into a plurality of parts. The mold part 70 includes a nest 70a, a template 70b, and a receiving plate 70c. In the mold part 70, the mold plate 70b and the receiving plate 70c are fixed to each other with a bolt or the like (not shown). Hereinafter, since the mold part 70 has the same configuration as the mold part 60 of the first mold 41, the description thereof will be omitted as appropriate.

  Of the mold part 70, the insert 70a is a transfer part TS2 for transferring an optical surface or the like. Similar to the insert 60a of the first mold 41, the insert 70a has a quadrangular prism shape when viewed from the mold fitting surface PS2. At the tip of the insert 70a, an optical transfer surface 56a and a flange transfer surface 56b are provided as a forming surface 55a for defining the cavity CV. The optical transfer surface 56a is a curved convex surface formed at the tip of the insert 70a, and serves as a transfer surface for molding one optical surface SO2 of the center portion LPa constituting the lens LP. The flange transfer surface 56b is an annular flat surface perpendicular to the axis AX formed at the tip of the insert 70a, and is a transfer surface for molding one flange surface (peripheral surface) SF2 of the flange portion LPb constituting the lens LP. is there. Since the flange surface SF2 is formed as a continuous surface by the forming surface 55a of the insert 70a that is also used for forming the optical surface SO2, the inclination with respect to the optical surface SO2 can be accurately set. As a result, the flange surface SF2 can be used as a joint surface when the lens LP is joined to another lens (not shown), and high-precision joining is possible. A concave portion for a gate or a runner is formed at an appropriate position on the front end surface of the insert 70a and outside the flange transfer surface 56b. The insert 70a is fixed by the fixture FX similarly to the insert 60a of the first mold 41, and has a contact portion facing the fixture FX. The contact portion is formed at one location on the outer periphery on the mold matching surface PS2 side, and contacts the taper portion of the fixture FX. Although the detailed description is omitted, the structure of the insert 70a and the fixture FX attached thereto is the same as the structure of the insert 60a and the fixture FX attached thereto.

  The template 70b is a metal plate-like member, and is a frame portion FR2 that holds the insert 70a of the transfer portion TS2 from the periphery. The template 70b includes a plurality of nesting accommodation holes 71a into which the plurality of nestings 70a are inserted, and a cold slug 71b facing the sprue port 61b. Further, the template 70b has an end surface 71c that forms the mold matching surface PS2. The nesting storage hole 71 a has a quadrangular prism shape, like the nesting 60 a of the first mold 41. In the template 70b, pin insertion openings 71g and 71k through which the ejector pins 75a and 75b constituting the ejector member 75 are also formed.

  The receiving plate 70c is a metal plate-like member, is disposed between the template plate 70b and the mounting plate 74, and supports the template plate 70b from behind. The receiving plate 70c includes pin insertion openings 71h and 71i through which the ejector pins 75a and 75b constituting the ejector member 75 are passed.

  Although not shown in the inside of the mold part 70, in the same way as the first mold 41, the mold temperature controller 47 of FIG. The temperature control flow path for circulating the heat medium from, the thermometer for temperature monitoring, the heater for heating, etc. are incorporated.

  The mounting plate 74 is a metal plate-like member, and supports the mold part 70 from behind. The mounting plate 74 includes pin insertion openings 74g and 74h through which the ejector pins 75a and 75b constituting the ejector member 75 are passed.

  The ejector member 75 is a mechanical mechanism having ejector pins 75a and 75b and an ejector plate 75d, and operates by being driven by the ejector driving unit 45 of FIG. The ejector pins 75a and 75b are connected to the ejector plate 75d, and are moved forward and backward collectively in the pin insertion ports 71g, 71h, 71i and 71k of the mold portion 70 and the pin insertion ports 74g and 74h of the mounting plate 74. be able to. When the ejector member 75 is set in the advanced state, the ejector pins 75a and 75b move forward, and the central ejector pin 75a protrudes from the bottom of the cold slug 71b provided on the template 70b of the mold portion 70, and other ejectors. The pin 75b pushes the runner PR and protrudes from the die matching surface PS2. Conversely, when the ejector member 75 is in the retracted state, the ejector pins 75a and 75b are retracted, and the ejector pins 75a and 75b form a cold slug 71b provided on the mold plate 70b of the mold part 70 and the runner space RU. Retract into the bottom of the surface portion 71r.

  In addition, when the 1st metal mold | die 41 and the 2nd metal mold | die 42 are clamped, the formation surface 51a of the nest | insert 60a incorporated in the 1st metal mold | die 41 and the formation surface 55a of the nest | insert 70a incorporated in the 2nd metal mold | die 42 are carried out. A cavity CV for molding the optical element is formed between the two. A runner space RU is formed between a mold surface part 61r provided on the mold surface of the mold part 60 of the first mold 41 and a mold surface part 71r provided on the mold surface of the mold part 70 of the second mold 42. It is formed. The runner space RU is a part of the flow path space FC shown in FIG. 2B and communicates with the sprue port 61b (see FIG. 2A).

  Hereinafter, a specific adjustment method and manufacturing method of the molding die 40 will be described. First, a molding die 40 shown in FIG. 1 is prepared. Here, the first and second molds 41 and 42 constituting the molding die 40 are inserted into the inserts 60a constituting the transfer portions TS1 and TS2 using a fixture FX having a taper portion TL having a certain taper angle θ. 70a is fixed to template 60b, 70b, respectively. The lens LP produced experimentally using the molding die 40 thus prepared is measured to measure the relative inclination of the flange surfaces SF1 and SF2 of the flange portion LPb and the coma aberration of the center portion LPa. For example, by measuring the relative tilt or tilt of the flange surfaces SF1 and SF2 using an interferometer, an autocollimator, an eccentric microscope, etc., the tilt or tilt generated between the pair of transfer portions TS1 and TS2 The direction and amount of can be calculated. In order to cancel the inclination direction and the inclination amount of the transfer portions TS1 and TS2 obtained in this way, the fixing device FX having another taper portion TL having a slightly different taper angle θ is selected while the nestings 60a and 70a are left as they are. To do. That is, the nestings 60a and 70a are assembled to the first and second molds 41 and 42, respectively, while adjusting the inclination of the nestings 60a and 70a by changing the taper angle θ by exchanging the fixture FX. Thereby, the relative inclination of the flange surfaces SF1 and SF2 of the flange portion LPb can be prevented, and the coma aberration of the lens LP can be reduced. The trial production of the lens LP as described above is performed not only once but also a plurality of times for feedback, and the relative inclination obtained by gradually correcting the relative inclination of the measured flange surfaces SF1 and SF2 is obtained. The alignment of the transfer portions TS1 and TS2 is completed in such a way that a simple inclination is minimized. After that, the flange portion LPb is not formed in a wedge shape, and the lens LP having no coma aberration with no tilt of the flange surfaces SF1 and SF2 is mass-produced.

  Note that the direction and amount of inclination generated between the pair of transfer portions TS1 and TS2 are not limited to the method of directly measuring the flange surfaces SF1 and SF2, and the optical surface SO1 of the lens LP using an interferometer. It can also be detected by measuring the aberration of SO2. In this case, by separating the coma aberration from other aberrations, the direction and degree of the coma aberration can be obtained as numerical values, and this coma aberration is converted into the tilt direction and the tilt amount between the axes AX of the transfer portions TS1 and TS2. it can.

  Hereinafter, a method for manufacturing a molded product MP, that is, an optical element using the molding apparatus 100 shown in FIG. First, the mold temperature controller 47 heats the adjusted molds 41 and 42 to a temperature suitable for molding. Next, the opening / closing drive device 15 is operated to advance the movable platen 12 to start mold closing (mold closing process). By continuing the closing operation of the opening / closing drive device 15, as shown in FIG. 2B, mold clamping is performed to clamp the first mold 41 and the second mold 42 with a necessary pressure. In this state, in the injection molding machine 10, the injection device 16 is operated to inject molten resin into the cavity CV between the clamped first mold 41 and the second mold 42 at a necessary pressure. To perform injection (injection process). The injection molding machine 10 maintains the resin pressure in the cavity CV. Note that after the molten resin is introduced into the cavity CV, the molten resin in the cavity CV is gradually cooled by heat dissipation, so that the molten resin is solidified with the cooling and waits for completion of molding. Next, in the injection molding machine 10, the opening / closing drive device 15 is operated to perform mold opening for retracting the movable platen 12 (mold opening process). Along with this, the second mold 42 moves backward, and the first mold 41 and the second mold 42 are separated. Next, in the injection molding machine 10, the ejector driving unit 45 is operated, and the molded product MP including the optical element is ejected by the advancement of the ejector pins 75a and 75b. As a result, the optical element of the molded product MP is pushed out to the first mold 41 side and released from the second mold 42 (release process). Finally, the take-out device 20 is operated so that the proper position of the extruded molded product MP is gripped by the hand 21 and taken out to the outside (take-out process).

  In the optical element molding die and the optical element manufacturing method described above, positioning and tilt adjustment of the nesting 60a is performed only by attaching the wedge-shaped fixture FX so as to be inserted from the mold matching surface PS1 side. Can do. Therefore, it is excellent in workability and maintainability for incorporating the insert 60a into the template 60b. The inclination of the nesting 60a with respect to the template 60b depends on the perpendicularity of the side surface 63c of the concave portion 63a of the template 60b. Therefore, the nesting 60a is determined by making a difference between the taper angle θ of the fixture FX and the taper angle α of the nesting 60a. Adjust the posture. In the template 60b, even when the perpendicularity of the side surface 63c of the recess 63a is poor, by appropriately selecting the taper angles θ and α of the fixture FX or the insert 60a, the manner in which the fixture FX and the insert 60a are contacted is changed. The posture of the nesting 60a is adjusted. Thereby, the inclination of the nesting 60a can be adjusted. Since the nest 60a is not a mechanism for tilting the nest 60a itself, but the nest 60a is abutted against the concave portion 63a of the template 60b, the position reproducibility in the direction along the die mating surface PS1 is good, and the nest 60a is placed in one place by the fixture FX. The tilt of the nesting 60a can be suppressed only by fixing. Thereby, in a lens having a strict optical performance standard such as a pickup lens or a compound eye lens, the tilt of the molding surface of the molded product can be adjusted with high accuracy, and a highly accurate optical element can be obtained. The above also applies to the insert 70a and the fixture FX of the second mold 42.

[Second Embodiment]
Hereinafter, the molding die for the optical element of the second embodiment will be described. The molding die or the like for the optical element of the second embodiment is a modification of the molding die or the like for the optical element of the first embodiment, and items not specifically described are for the optical element of the first embodiment. It is the same as a molding die. In addition, since the structure of the 1st metal mold | die 41 and the 2nd metal mold | die 42 is substantially the same, the 1st metal mold | die 41 is mainly demonstrated.

  As shown in FIG. 7A, the insert 60a of the first mold 41 is divided into a core part 66 as a mold body, a cylindrical peripheral part 67 surrounding the core part 66, and a root of the core part 66. It has a plate-like core spacer 68 disposed on the side, and a rotating base 69 that supports the peripheral portion 67 and the core spacer 68. Here, in the nest 60a, the core portion 66, the peripheral portion 67, and the core spacer 68 constitute a nest body BH. The tip surface of the core portion 66 is a forming surface 51a for forming the optical function portion of the optical element. The rotary pedestal 69 is a plate-like posture adjustment component connected to the lower portion of the nesting body BH, and adjusts the relative position in the axis AX direction of the core 66 in the peripheral portion 67, that is, the inclination angle and inclination direction of the axis AX. To function as a spacer.

  As shown in FIGS. 7B and 7C, the rotary pedestal 69 is a disk-shaped member, but has a thickness difference between the pair of opposed portions 69a and 69b. Specifically, as shown in FIG. 7B, the rotary base 69 has a flat front side surface 69d, a flat back side surface 69e, and a cylindrical side surface 69f. The front side surface 69d is, for example, an inclined surface that decreases toward the right side of the paper surface, and the front side surface (inclined surface) 69d and the back side surface 69e form an inclination angle β. As a result, the left first opposing portion 69a is thicker than the right second opposing portion 69b. In the drawings, the inclination angle β is exaggerated.

  As shown in FIG. 7C, the rotary base 69 is formed with eight attachment holes 69n at locations around the circumference that are equally divided into eight. The attachment holes 69n are for fixing the rotary base 69 to the peripheral portion 67 using the four fasteners MT3. Here, since the eight attachment holes 69n are formed on the same circumference at equal angular intervals, 45 ° to 90 ° around the axis AX1 of the first mold 41 is secured when the rotary base 69 is fixed. The rotational position can be adjusted at a pitch of °. Thereby, the correction | amendment matched with the tilt direction which generate | occur | produced along the type | mold alignment surface can be made easy.

  When the rotating base 69 shown in FIGS. 7B and 7C is assembled to the first mold 41 of FIG. 1, the rotating base 69 is supported and fixed to the receiving plate 60c. As a result, the axis AX of the transfer portion TS1 itself is inclined by the inclination angle β with respect to the axis AX1 of the first mold 41 due to the inclination angle β of the rotary base 69. Here, since the rotation base 69 can adjust the rotation position with respect to the core portion 66 and the like at a pitch of 45 ° to 90 °, the inclination direction of the axis AX limited to the transfer portion TS1 is the first mold 41. Can be set to one desired direction among the eight directions divided into eight equal parts around the basic axis AX1. That is, the inclination of the axis AX of the transfer portion TS1 can be switched to an arbitrary direction selected from eight directions according to the rotation position of the rotary base 69.

  The rotating pedestal 69 is selected from a plurality of members having substantially the same shape except that the thickness or the inclination angle β is different. As a result, the rotation base 69 can be appropriately selected according to the unintended inclination degree and dimensional error formed in the nesting body BH, and precise tilt adjustment and the like can be performed. Further, the number of mounting holes 69n of the rotating base 69 is not limited to eight, and can be any arbitrary number of 2 or 3 or more. In this case, screw holes corresponding to the peripheral portion 67 are also provided. Will be provided.

  7A and 7D are diagrams for explaining an example of a method of using the rotating base 69 in the first mold 41. FIG. 7D, the pedestal of the first mold 41 is a parallel pedestal 69s without inclination. First, the parallel pedestal 69s is fixed to the lower part of the nesting body BH, the tilt of the nesting 60a is roughly adjusted by the fixture FX, and the tilt amount is confirmed by molding. In the state of FIG. 7D, the transfer portion TS1 of the first mold 41 is slightly inclined in the template 60b. That is, the axis AX of the transfer portion TS1 is slightly inclined with respect to the axis AX1 on the first mold 41 or the template 60b side. Next, as shown in FIG. 7A, an appropriate one of the plurality of types of rotating pedestals 69 prepared is selected and inserted into the lower portion of the nesting body BH, and the attitude of the entire nesting 60a is finely adjusted. Thereby, the axis AX of the transfer portion TS1 in the first mold 41 can be made substantially parallel to the axis AX1.

  In the present embodiment, the nesting body BH, which is the transfer portion TS1, is configured separately from the core portion 66, the peripheral portion 67, and the core spacer 68. However, as shown in FIG. The configured transfer portion TS1 may be used.

  In the molding die according to the present embodiment, since there is a rotating base 69 that is fixed as a part of the insert 60a on the back side of the insert 60a and tilts the insert main body BH with respect to the mold fitting surface PS1, Along with the tilt adjustment in FX, a more accurate tilt adjustment is possible. Thereby, the inclination of the nesting 60a can be finely adjusted to 1 minute or less. In particular, this is effective for tilt adjustment in the case where the insert 60a is configured as a separate body such as the core portion 66 and the peripheral portion 67. When the nest 60a is constituted by the core part 66 and the peripheral part 67 as separate bodies, it is difficult to make the assembly tilt zero because the parallelism and flatness are different for each component. Although the contact between the fixture FX and the insert 60a is changed by using the rotary base 69, since the adjustment width of the rotary base 69 is small, the influence on the adjustment effect of the rotary base 69 is very small. Since the inclination of the nesting 60a with respect to the template 60b can be minimized by selecting an appropriate fixture FX, the adjustment range of the inclination by the rotating base 69 below the nesting body BH can be reduced, and the nesting 60a can be projected from the template 60b. It is possible to prevent the opposing nestings 60a and 70a from interfering with each other.

[Third Embodiment]
Hereinafter, a molding die for an optical element according to the third embodiment will be described. The molding die or the like for the optical element of the third embodiment is a modification of the molding die or the like for the optical element of the first embodiment, and items not specifically described are for the optical element of the first embodiment. It is the same as a molding die. In addition, since the structure of the 1st metal mold | die 41 and the 2nd metal mold | die 42 is substantially the same, the 1st metal mold | die 41 is mainly demonstrated.

  As shown in FIGS. 8A and 8B, in the present embodiment, two adjacent side surfaces 60m facing the inner wall or the side surface 63c of the recess 63a of the insert 60a are aligned with the mating surface PS1 of the insert 60a with respect to the template 60b. A position adjustment spacer 200 for finely adjusting the position in the direction is attached. Two screw holes 94 are formed in the central portion of the position adjustment spacer 200. Further, as shown in FIG. 8C, two screw holes 95 are also formed on the side surface 60m of the insert 60a at positions corresponding to the screw holes 94 of the position adjusting spacer 200. The position adjusting spacer 200 is fixed to the insert 60a by the fixing bolt MT4 through the screw holes 94 and 95. The position adjustment spacer 200 is selected from a plurality of members having substantially the same shape except that the thickness is different. Thereby, the position adjusting spacer 200 can be appropriately selected according to the position of the insert 60a, and precise positioning can be performed. The position adjusting spacer 200 is preferably prepared with a pitch of several μm in thickness. When the position adjustment spacer 200 is thin, the head portion may protrude from the position adjustment spacer 200 even if the shape of the head portion of the fixing bolt MT4 is devised. In this case, for example, a recess that avoids interference with the head portion of the fixing bolt MT4 is formed on the template 60b side.

  In the molding die in the present embodiment, the position adjustment spacer 200 is attached to the side surface 60m of the insert 60a, so that the shift in the direction along the die mating surface PS1 (shift in the XY direction) can be adjusted with high reproducibility and high accuracy. In addition, since it is difficult to adjust the position in the X and Y directions with only one side surface 60m, it is desirable to provide the position adjustment spacer 200 on two adjacent two side surfaces 60m on the opposite side of the fixture FX.

[Fourth Embodiment]
Hereinafter, a molding die for optical elements according to the fourth embodiment will be described. The molding die for the optical element according to the fourth embodiment is a modification of the molding die for the optical element according to the first embodiment. The matters not specifically described are for the optical element according to the first embodiment. It is the same as a molding die.

  As shown in FIGS. 9A and 9B, the optical element molded by the molding die of this embodiment is a compound eye lens 300. The compound eye lens 300 has a quadrangular outline in plan view. The compound eye lens 300 has a plurality of lens portions 300a. Each lens part 300a has a lens element Lm and a flange part Ln that supports the lens element Lm from the periphery. That is, the compound eye lens 300 is an optical element in which a plurality of lens elements Lm are integrally molded via the flange portion Ln. The compound eye lens 300 is two-dimensionally arranged on square lattice points (for example, 4 × 4 16 points) in which a plurality of lens portions 300a are arranged in parallel to the XY plane. Each lens element Lm has a convex first optical surface SO1 on one main surface BT1 side, and a convex second optical surface SO2 on the other main surface BT2 side. Both optical surfaces SO1 and SO2 are, for example, aspherical surfaces.

  FIG. 10 is a view for explaining a molding die 40 for molding the compound eye lens 300. The first mold 41 is formed with a forming surface 51a for transferring the shape of the main surface BT1 side of the compound eye lens 300 by the nest 60a, and the second mold 42 is formed with the main surface of the compound eye lens 300 by the nest 70a. A formation surface 55a for transferring the shape on the BT2 side is formed. In the molding die 40, a gate GA communicating with a cavity CV formed between the formation surfaces 51a and 55a is formed. The gate GA is provided adjacent to the flange forming portion FP corresponding to the flange portion Ln. The molded product MP thus molded is subjected to a gate cut process, and the compound eye lens 300 is obtained.

  In the molding die of the present embodiment, the tilt of the entire compound eye lens 300 can be adjusted with high accuracy even in the compound eye lens 300 in which a plurality of lens portions 300a are formed in one molded product.

  If a slight tilt occurs in the inserts 60a and 70a in the molding die 40, the influence on the difference in the thickness of the lens portion 300a of the compound eye lens 300 to be molded becomes large, and it becomes difficult to adjust the thickness.

  Although 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. For example, in the above-described embodiment, the rotating pedestal 69 has a disc shape, but the rotating pedestal 69 in the present invention may have another contour shape other than the disc shape.

  Further, the rotation base 69 shown in FIG. 7A or the like is sufficient as long as it can form the inclination angle β, and even if the front side surface 69d and the back side surface 69e are partially missing, it can function similarly.

  Moreover, in the said embodiment, the shape, the magnitude | size, and the number of the formation surfaces 51a and 55a of the nests 60a and 70a can be suitably changed according to a use.

  Moreover, in the said embodiment, although the shape of the nests 60a and 70a and the nest storage holes 61a and 71a was made into the prismatic shape, it may be circular.

  In the above embodiment, the injection molding machine 10 is not limited to the horizontal type, but can be a vertical type molding machine in which the first mold 41 and the second mold 42 are arranged vertically.

Claims (12)

A nesting provided at the tip with a forming surface corresponding to the optical surface and peripheral surface on one side of the optical element;
A template holding the nesting;
A fixing tool for fixing the insert from the mold matching surface side to the recess of the template,
The fixture has a tapered portion on the side in contact with the contact portion provided on the upper portion of the insert,
The nest has a chamfered shape facing the tapered portion of the fixture as the contact portion,
The taper angle of the taper portion of the fixture is greater than the taper angle of the abutment portion of the nest,
The fixing device fixes the nesting with respect to the mold plate in one direction from the mold matching surface side, thereby positioning the nesting with respect to the mold plate along the mold matching surface and adjusting the inclination with respect to the mold matching surface. A mold for optical elements.   2. The molding die for an optical element according to claim 1, wherein the nest has a prismatic shape, and has the abutting portion corresponding to a notch in a corner portion of the prism.   The said fixture is arrange | positioned in the back of the said mold matching surface in the state which contact | abutted to the said contact part provided in the said mold matching surface side of the said nest | insert. Mold for optical elements.   The molding tool for an optical element according to any one of claims 1 to 3, wherein the fixture is selected from a plurality of members having substantially the same shape except that the angle of the tapered portion is different.   The molding die for an optical element according to any one of claims 1 to 4, further comprising a posture adjusting component that is fixed to a back side of the insert as a part of the insert and tilts the insert main body with respect to the mold-matching surface. Type.   The molding die for an optical element according to claim 5, wherein the posture adjusting component is a plate-like pedestal connected to a lower portion of the nesting body.   The molding die for an optical element according to any one of claims 5 and 6, wherein the posture adjusting component is a rotating pedestal that adjusts a rotational position at a pitch of 45 ° to 90 °.   The molding die for an optical element according to any one of claims 5 to 6, wherein the posture adjusting component is selected from a plurality of members having substantially the same shape except that the thickness is different.   The optical element according to any one of claims 1 to 8, further comprising a spacer that is attached to a side surface of the insert and finely adjusts a position of the insert in a direction along the mold fitting surface with respect to the concave portion of the template. Molding mold.   The molding die for an optical element according to claim 9, wherein the spacer is selected from a plurality of members having substantially the same shape except that the spacers have different thicknesses.   The molding die for an optical element according to any one of claims 1 to 10, wherein the optical element is a compound eye lens. An optical element manufacturing method using a transfer portion having a nesting provided with a forming surface corresponding to an optical surface and a peripheral surface on one side of the optical element and a frame portion having a template for holding the nesting. And
Using a fixture that fixes the insert from the mold matching surface side to the recess of the template,
The fixture has a tapered portion on the side in contact with the contact portion provided on the upper portion of the insert,
The nest has a chamfered shape facing the tapered portion of the fixture as the contact portion,
The taper angle of the taper portion of the fixture is greater than the taper angle of the abutment portion of the nest,
The method of manufacturing an optical element, wherein the fixture performs positioning in a direction along the mold matching surface of the insert with respect to the template and inclination adjustment with respect to the mold matching surface.

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