WO2013146652A1 - Procédé de fabrication d'une lentille et matrice de moulage - Google Patents

Procédé de fabrication d'une lentille et matrice de moulage Download PDF

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Publication number
WO2013146652A1
WO2013146652A1 PCT/JP2013/058524 JP2013058524W WO2013146652A1 WO 2013146652 A1 WO2013146652 A1 WO 2013146652A1 JP 2013058524 W JP2013058524 W JP 2013058524W WO 2013146652 A1 WO2013146652 A1 WO 2013146652A1
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WO
WIPO (PCT)
Prior art keywords
transfer surface
lens
fixed
mold
astigmatism
Prior art date
Application number
PCT/JP2013/058524
Other languages
English (en)
Japanese (ja)
Inventor
奥山寛之
Original Assignee
コニカミノルタ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Publication of WO2013146652A1 publication Critical patent/WO2013146652A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/0048—Moulds for lenses
    • B29D11/005—Moulds for lenses having means for aligning the front and back moulds
    • B29D11/00509—Moulds for lenses having means for aligning the front and back moulds to make toric lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
    • B29C45/376—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings adjustable
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • B29C45/561—Injection-compression moulding
    • 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 manufacturing method of an objective lens and other lenses incorporated in an optical pickup device and the like, and a molding die used in the manufacturing method.
  • the present invention has been made in view of the above-described background, and provides a lens manufacturing method and a molding die that can easily adjust astigmatism and can suppress the occurrence of coma due to the adjustment. With the goal.
  • a method for manufacturing a lens according to the present invention includes a first mold having a first transfer surface for forming the first optical surface of the lens, and a second optical surface of the lens.
  • a second astigmatism correction different from the astigmatism correction is applied, and the astigmatism of the lens is adjusted by rotating the second transfer surface around the axis while fixing the first transfer surface.
  • the astigmatism of the lens is adjusted by rotating the second transfer surface around the axis corresponding to the optical axis while the first transfer surface is fixed, so that the astigmatism adjustment operation is simplified.
  • the first transfer surface can be fixed during adjustment of astigmatism, it is possible to relatively reliably suppress the occurrence of coma with the adjustment.
  • the first mold has an axial first core portion formed with the first transfer surface at the tip, and the second mold is the second transfer surface.
  • the first core portion is rotated during adjustment, and the other first core portion is fixed during adjustment.
  • the astigmatism adjustment work is further simplified.
  • the second asperity correction applied to the second transfer surface of the second core portion rotated during adjustment is applied to the first transfer surface of the first core portion fixed during adjustment. It is smaller than the first asphalt correction. In this case, the adjustment range of the astigmatism achieved by the rotation of the second core portion is narrowed, but the astigmatism can be finely adjusted accordingly.
  • the curvature of the second transfer surface of the second core portion rotated during adjustment is smaller than the curvature of the first transfer surface of the first core portion fixed during adjustment.
  • the sensitivity of the first transfer surface of the first core portion is relatively high with respect to the inclination and the like. Therefore, when adjusting the astigmatism, the first core portion is not rotated, so that the influence on the overall optical performance is suppressed to a small level. be able to.
  • a fine structure is formed on the first transfer surface of the first core portion fixed during adjustment, and a fine structure is formed on the second transfer surface of the second core portion rotated during adjustment. Not formed.
  • the first transfer surface of the first core part is relatively susceptible to inclination and the like, the influence on the overall optical performance is suppressed by not rotating the first core part when adjusting astigmatism. be able to.
  • the lens is made of plastic.
  • Plastic lenses formed by injection molding or the like are often susceptible to astigmatism due to the effects of moldability and mold release properties. Since the aberration can be adjusted, a highly accurate lens can be obtained by a simple adjustment operation, and the occurrence of coma aberration accompanying the adjustment can be suppressed.
  • the first transfer surface and the second transfer surface have a circular outline. Since the second transfer surface is rotated while the first transfer surface is fixed, adjustment is easier if both transfer surfaces are circular.
  • the first mold has a plurality of first transfer surfaces
  • the second mold has a plurality of second transfer surfaces
  • the first transfer surface and the second transfer surface facing each other
  • a plurality of sets of molding spaces are formed, and astigmatism variation amounts adjusted between the plurality of sets of molding spaces are adjusted by rotating the second transfer surface while the first transfer surface is fixed.
  • a plurality of lenses can be manufactured collectively by a single mold device, and astigmatism can be prevented from varying between the plurality of lenses.
  • the adjustment workability can be improved as compared with the case where the adjustment is performed by rotating the first transfer surface and the second transfer surface.
  • the second astigmatism applied to the second transfer surface can be minimized, and the deterioration of the optical performance of the lens accompanying the adjustment can be minimized.
  • a molding die includes a first mold having a first transfer surface for molding the first optical surface of the lens, and a second optical surface of the lens.
  • a second mold having a second transfer surface the first transfer surface is provided with a first asphalt correction
  • the second transfer surface is provided with a second asphalt correction different from the first asperity correction
  • the astigmatism of the lens can be adjusted by allowing the second transfer surface to be rotated around the axis while the one transfer surface is fixed.
  • the first transfer surface and the second transfer surface are provided with different astigmatism correction, and the second transfer surface can be rotated around the axis while the first transfer surface is fixed. Since the astigmatism can be adjusted, the astigmatism adjustment work is simplified. In addition, since the first transfer surface can be fixed during adjustment of astigmatism, it is possible to relatively reliably suppress the occurrence of coma with the adjustment.
  • FIG. 2A is a side sectional view for explaining the function of the molding die
  • FIG. 2B is a diagram for explaining the shape of a lens manufactured by molding with the molding die
  • 3A to 3C are conceptual diagrams for explaining a method for adjusting astigmatism.
  • the molding die 40 includes a fixed die 41 and a movable die 42. Both molds 41 and 42 can be opened and closed with the dividing plane PL as a boundary.
  • the molding die 40 enables a large number of molds to be formed, and a plurality of molding surfaces or transfer surfaces are formed on the divided surfaces PL of both the dies 41 and 42 as will be described in detail later.
  • the fixed mold 41 functions as a second mold in this embodiment.
  • the fixed mold 41 includes a plurality of fixed-side core portions 51, a mold plate 53 that supports these fixed-side core portions 51, and a rotation mechanism 55 associated with each fixed-side core portion 51.
  • the fixed-side core portion 51 is inserted into a through hole 53d provided in the template 53, and is fixed by a mold portion (not shown).
  • the rotation mechanism 55 is used when adjusting the rotation angle or the rotation posture around the axis AX of the fixed-side core portion 51.
  • the fixed mold (second mold) 41 is fixed so as to be opposed to the movable mold 42 via a fixed plate (not shown).
  • the movable mold 42 functions as a first mold in the present embodiment.
  • the movable mold 42 includes a plurality of movable side core portions 61 and a mold plate 63 that supports these movable side core portions 61.
  • the movable core portion 61 is inserted into a through hole 63d provided in the mold plate 63 and fixed by a mold portion (not shown).
  • the movable mold (first mold) 42 is driven by an opening / closing drive device 70 via a movable plate (not shown) so as to be reciprocally movable in the AB direction. That is, the opening / closing drive device 70 enables the molds 41 and 42 to be opened / closed and clamped.
  • a fixed-side transfer surface 51c is formed at the distal end portion 51a of the fixed-side core portion 51 inserted into the through hole 53d of the fixed mold 41.
  • the fixed transfer surface 51c is a curved surface having a symmetric circular contour around the axis AX.
  • the fixed core portion 51 is a rotating second core portion.
  • the fixed transfer surface 51c is a second transfer surface formed on the second core portion.
  • a movable transfer surface 61c is formed at the tip 61a of the movable core 61 inserted into the through hole 63d of the movable mold 42.
  • the movable transfer surface 61c is a curved surface having a symmetric circular contour around the axis AX.
  • the movable core portion 61 is a first core portion that does not rotate.
  • the movable transfer surface 61c is a first transfer surface formed on the first core portion.
  • the curvature of the fixed transfer surface 51c is smaller than the curvature of the movable transfer surface 61c. That is, the fixed transfer surface 51c is a shallow and gentle curved surface, and the movable transfer surface 61c is a deep curved surface.
  • Astigmatism correction is applied to the fixed-side transfer surface (second transfer surface) 51c of the fixed-side core portion (second core portion) 51. Astigmatism correction is also applied to the movable transfer surface (first transfer surface) 61c of the movable core portion (first core portion) 61.
  • first direction can be, for example, the CD direction in FIG. 1
  • second direction can be, for example, the EF direction in FIG.
  • the second astigmatism applied to the fixed-side transfer surface 51c of the fixed-side core portion 51 that is rotated during adjustment is applied to the movable-side transfer surface 61c of the movable-side core portion 61 that is fixed during adjustment. It is smaller than the applied first asphalt correction.
  • a fine structure FP that is a diffractive structure is formed on the movable side transfer surface (first transfer surface) 61c of the movable side core portion (first core portion) 61, and the fixed side core portion (second core portion) 51 is fixed.
  • the fine structure FP is not formed on the side transfer surface (second transfer surface) 51c.
  • a cavity CV which is a molding space in which a molding resin is injected and transferred, is formed.
  • a plurality of fixed-side transfer surfaces 51 c are formed in the fixed mold 41 so that a plurality of fixed-side core portions 51 are embedded.
  • a plurality of movable side transfer surfaces 61c are formed by being embedded so that a plurality of movable side core portions 61 are embedded.
  • Any one fixed-side transfer surface (second transfer surface) 51c is opposed to any one movable-side transfer surface (first transfer surface) 61c.
  • a plurality of sets of cavities (molding spaces) CV are formed by the fixed transfer surface 51c and the movable transfer surface 61c facing each other, and astigmatism and the like can be individually adjusted for each cavity CV. Note that molten resin from a common nozzle is simultaneously supplied to the plurality of sets of cavities CV.
  • the lens 10 shown in FIG. 2B is formed by a cavity CV provided in the mold part shown in FIG. 2A.
  • the lens 10 is made of plastic and includes a central portion 11 as an optical functional portion having an optical function, and an annular flange portion 12 extending from the central portion 11 in the outer diameter direction.
  • the lens 10 is an objective lens for an optical pickup device, and can read or write optical information corresponding to the BD (Blu-ray (registered trademark) Disc) standard with a wavelength of 405 nm and NA of 0.85, for example.
  • the curvature of the first optical surface S1 on the laser light source side in the central portion 11 is larger than the curvature of the second optical surface S2 on the information recording medium side.
  • the first optical surface S1 corresponds to the movable transfer surface (first transfer surface) 61c
  • the second optical surface S2 corresponds to the fixed transfer surface (second transfer surface) 51c.
  • the first optical surface S1 having a large curvature is formed with a fine structure obtained by transferring the fine structure FP provided on the movable transfer surface 61c.
  • the lens 10 is an objective lens that complies with standards other than BD, specifically, DVD (Digital Versatile Disc) with a wavelength of 655 nm and NA 0.65, CD (Compact Disc) with a wavelength of 780 nm and NA 0.53. There may be.
  • the lens 10 may be a three-wavelength compatible type objective lens corresponding to three standards of BD, DVD, and CD.
  • the astigmatism of the movable transfer surface (first transfer surface) 61c is obtained by relatively increasing the power in the vertical reference direction, and the fixed transfer surface (second transfer surface).
  • Surface) 51c astigmatism is also obtained by relatively increasing the power in the vertical relative direction.
  • the astigmatism of the movable transfer surface 61c is larger than that of the fixed transfer surface (second transfer surface) 51c as indicated by the number of “+” symbols.
  • the astigmatism of the movable transfer surface (first transfer surface) 61c is maintained while increasing the power in the vertical reference direction, and the fixed transfer surface (second transfer surface) 51c is maintained.
  • Astigmatism is an increase in lateral relative power.
  • the astigmatism combining the movable transfer surface 61c and the fixed transfer surface 51c acts so as to cancel each other, but the astigmatism of the movable transfer surface 61c is more than the astigmatism of the fixed transfer surface 51c.
  • the astigmatism of the movable transfer surface (first transfer surface) 61c is maintained while increasing the power in the vertical reference direction, and the fixed transfer surface (second transfer surface) 51c is maintained.
  • Astigmatism increases the power in the oblique relative direction.
  • astigmatism or astigmatism correction amount TA in the vertical reference direction combining the movable transfer surface 61c and the fixed transfer surface 51c acts to strengthen or cancel each other, but the rotation of the fixed transfer surface 51c.
  • the amount is an addition amount or an offset amount according to the posture, and can be increased or decreased between the minimum value AS1-AS2 and the maximum value AS1 + AS2.
  • a desired astigmatism can be generated around the astigmatism AS1 of the movable transfer surface 61c.
  • Astigmatism of the molded lens 10 can be adjusted.
  • the astigmatism AS2 set on the fixed transfer surface 51c to be rotated is assumed to be approximately the same as the variation among the plurality of cavities CV formed in the molding die 40. As a result, variations in astigmatism between cavities CV can be compensated by adjusting the rotation angle ⁇ of each fixed-side transfer surface 51c.
  • any one or all of the fixed-side transfer surfaces 51c have a larger astigmatism AS2. Can be modified or replaced.
  • the fixed transfer surface (second transfer surface) 51c is rotated around the axis AX while the movable transfer surface (first transfer surface) 61c is fixed. Since the astigmatism of the lens 10 is adjusted by rotating the lens 10, the astigmatism adjustment work is simplified. Further, since the movable transfer surface 61c can be kept fixed when adjusting the astigmatism, it is possible to relatively reliably suppress the occurrence of coma with the adjustment.
  • 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 cavity CV provided in the molding die 40 composed of the fixed die 41 and the movable die 42 is not limited to the shape shown in the figure, and can be various shapes. That is, the shape of the illustrated cavity CV formed by the core portions 51, 61 and the like is merely an example, and can be appropriately changed according to the application of the lens 10 and the like.
  • contours of the transfer surfaces 51c and 61c are not limited to a circle but may be a quadrilateral or other polygons or an ellipse.
  • the movable transfer surface 61c can be rotated around the axis AX while the fixed transfer surface 51c is fixed.
  • the fixed transfer surface 51c is the first transfer surface
  • the movable transfer surface 61c is the second transfer surface. At this time, it is not necessary to relatively increase the curvature of the movable transfer surface 61c, and it is also possible to relatively increase the curvature of the fixed transfer surface 51c.
  • the astigmatism of the movable transfer surface (first transfer surface) 61c is not limited to the vertical direction of the reference direction for increasing the power, and the reference direction can be set to be horizontal or oblique.
  • the transfer surface having a large curvature (the movable transfer surface 61c in the embodiment) does not necessarily need to be the first transfer surface to be fixed without rotating, and the transfer surface having the small curvature (the fixed transfer surface 51c in the embodiment) is not rotated. It can also be the first transfer surface. However, if the transfer surface having a large curvature is used as the first transfer surface that is fixed without being rotated, astigmatism is stabilized and astigmatism correction becomes relatively easy.
  • the lens 10 formed by the molding die 40 is generally made of plastic, but the same technique as in the above embodiment can be used when the same as correction is required in glass molding.
  • the lens 10 formed by the molding die 40 is not limited to an objective lens, and can be a collimator lens or other various lenses.
  • the fine structure FP which is a diffraction structure is formed on the movable transfer surface 61c of the movable core 61, the same astigmatism can be adjusted even when the fine structure FP is not formed.
  • the above astigmatism adjustment can also be applied when one cavity CV is formed in the molding die 40.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Optical Head (AREA)

Abstract

L'invention concerne un procédé de fabrication de lentille et une matrice de moulage pour lesquels une opération de correction de la déviation astigmatique est facile et qui sont capables de supprimer l'occurrence présentant une aberration de coma accompagnant la correction. Par rotation d'un plan de transfert latéral fixe (second plan de transfert) (61c) autour d'un axe tout en fixant un plan de transfert latéral mobile (premier plan de transfert) (51c), aberration astigmatique d'une lentille (10) est corrigé, et par conséquent, simplifie l'intervention de correction de l'aberration astigmatique. De plus, la correction de l'aberration astigmatique peut être effectuée tandis que le côté mobile du plan de transfert (premier plan de transfert) (51c) est fixé, et par conséquent, il est possible de supprimer de manière fiable l'occurrence d'aberration comatique accompagnant le réglage.
PCT/JP2013/058524 2012-03-30 2013-03-25 Procédé de fabrication d'une lentille et matrice de moulage WO2013146652A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012081813 2012-03-30
JP2012-081813 2012-03-30

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WO2013146652A1 true WO2013146652A1 (fr) 2013-10-03

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000028806A (ja) * 1998-07-09 2000-01-28 Sony Corp レンズ及びその製造方法
JP2004198839A (ja) * 2002-12-19 2004-07-15 Matsushita Electric Ind Co Ltd 光ディスク用の対物レンズ及び対物光学系、並びにこれらを用いた光ヘッド装置
JP2004284116A (ja) * 2003-03-20 2004-10-14 Matsushita Electric Ind Co Ltd 光学素子成形型、光学素子成形方法及び光学素子
JP2008234726A (ja) * 2007-03-19 2008-10-02 Konica Minolta Opto Inc 複合対物レンズ成形金型、複合対物レンズ、及び光ピックアップ装置
WO2010143394A1 (fr) * 2009-06-11 2010-12-16 パナソニック株式会社 Élément optique de diffraction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000028806A (ja) * 1998-07-09 2000-01-28 Sony Corp レンズ及びその製造方法
JP2004198839A (ja) * 2002-12-19 2004-07-15 Matsushita Electric Ind Co Ltd 光ディスク用の対物レンズ及び対物光学系、並びにこれらを用いた光ヘッド装置
JP2004284116A (ja) * 2003-03-20 2004-10-14 Matsushita Electric Ind Co Ltd 光学素子成形型、光学素子成形方法及び光学素子
JP2008234726A (ja) * 2007-03-19 2008-10-02 Konica Minolta Opto Inc 複合対物レンズ成形金型、複合対物レンズ、及び光ピックアップ装置
WO2010143394A1 (fr) * 2009-06-11 2010-12-16 パナソニック株式会社 Élément optique de diffraction

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